Zoom Lens, Camera Module, and Terminal Device

TECHNICAL FIELD

This application relates to the field of optical device technologies, and in particular, to a zoom lens, a camera module, and a terminal device.

BACKGROUND

In recent years, with development of technologies, zoom lenses have been widely used in terminal products such as mobile phones. Currently, to balance wide-angle zoom, standard zoom, and telephoto zoom in a terminal product such as a mobile phone, two or three lenses with different focal lengths are usually used together, to form a hybrid optical zoom lens through algorithm-based digital zoom.

However, hybrid optical zoom is essentially continuous zoom implemented based on a plurality of lenses with different focal lengths and through algorithm processing, namely, “jump-type zoom”. This causes limited imaging definition of the hybrid optical zoom lens when a focal length of the hybrid optical zoom lens is between different focal lengths of the zoom lenses, and thus causes poor imaging quality of a terminal device equipped with the hybrid optical zoom lens.

SUMMARY

An objective of embodiments of this application is to provide a zoom lens, a camera module, and a terminal device, to resolve a technical problem of poor imaging quality of a terminal device equipped with a hybrid optical zoom lens in the conventional technology.

To achieve the foregoing objective, technical solutions used in this application are as follows.

According to a first aspect, a zoom lens is provided, including a first lens group, a second lens group, a third lens group, and a fourth lens group that are sequentially arranged from an object side to an image side along an optical axis. The first lens group and the third lens group are fixedly disposed.

The second lens group is a focusing group and moves along the optical axis, and the fourth lens group is a compensation group and moves along the optical axis with the second lens group. Alternatively, the fourth lens group is a focusing group and moves along the optical axis, and the second lens group is a compensation group and moves along the optical axis with the fourth lens group. The first lens group and the third lens group are fixedly disposed to form a fixed group of zoom lens. The second lens group and the fourth lens move along the optical axis. In this way, when zoom is performed from a wide-angle end to a telephoto end, the second lens group and the fourth lens group move along the optical axis at the same time, to implement zoom and compensation for an aberration generated during zoom. In addition, this can meet a high zoom ratio of the zoom lens, and maintain good imaging definition of the zoom lens.

A first lens from the object side in the first lens group is a biconvex lens. This can improve light converging performance of the first lens group, and prolong a back focal length of the zoom lens, so that the zoom lens has good imaging effect and a thickness of the zoom lens is reduced as much as possible. In addition, at least two lenses from the object side in the first lens group are glass lenses. In this way, deep processing can be implemented on the two lenses close to the object side, so that the two lenses can be thin and have a good optical path adjustment capability.

A maximum clear aperture diameter of the zoom lens meets the following relationship: 4 millimeters (mm)≤φ≤12 mm, where φ is the maximum clear aperture diameter of the zoom lens. The maximum clear aperture diameter of the zoom lens is set within a range from 4 mm to 12 mm. This can effectively reduce an overall height of the zoom lens, and improve luminous flux of the zoom lens. Due to the foregoing factors, this can improve overall imaging quality of the optical focal lens. In addition, the zoom lens can be made smaller, and can be easily used in a thin terminal device. In this way, the terminal device equipped with the zoom lens can implement continuous zoom, and maintain good imaging definition.

Optionally, the zoom lens meets the following relationship: 0.8≤TTL/ft≤1.5, where TTL is a total optical length of the zoom lens, and ft is an effective focal length at a telephoto end of the zoom lens. A ratio of the total optical length to the effective focal length at the telephoto end of the zoom lens is set within a range from 0.8 to 1.5. In this way, the zoom lens can maintain a good width of an angle of view and a good zoom ratio, and can also correct an off-axis aberration.

Optionally, the zoom lens meets the following relationship: 0.02≤IMH/ft≤0.2, where IMH is a height from an imaging edge to a center of an imaging plane of a lens of the zoom lens, and ft is an effective focal length at a telephoto end of the zoom lens. A ratio of the image height of the zoom lens to the effective focal length at the telephoto end of the zoom lens is set within a range from 0.02 to 0.2. This can improve the zoom ratio of the zoom lens, and reduce a total height of the zoom lens at the same time.

Optionally, the first lens group, the third lens group, and the fourth lens group have positive focal power, and the second lens group has negative focal power.

Optionally, the first lens group and the third lens group have positive focal power, and the second lens group and the fourth lens group have negative focal power.

Optionally, the first lens group meets the following relationship: 0.2≤f1/ft≤2.3, where f1 is a focal length of the first lens group, and ft is an effective focal length at a telephoto end of the zoom lens. A ratio of the focal length of the first lens group to the effective focal length at a telephoto end of the zoom lens is set within a range from 0.2 to 2.3. This can effectively improve a light converging capability of the first lens group, and help reduce an axial chromatic aberration.

Optionally, the second lens group meets the following relationship: 0.02≤f2/ft≤0.6, where f2 is a focal length of the second lens group, and ft is an effective focal length at a telephoto end of the zoom lens.

Optionally, the third lens group meets the following relationship: 0.1≤f3/ft≤4.5, where f3 is a focal length of the third lens group, and ft is an effective focal length at a telephoto end of the zoom lens.

Optionally, the fourth lens group meets the following relationship: 0.12≤f4/ft≤200, where f4 is a focal length of the fourth lens group, and ft is an effective focal length at a telephoto end of the zoom lens. In this way, the fourth lens group can widely compensate for an aberration generated by the second lens group in an entire moving process.

Optionally, a ratio of an effective focal length ft at a telephoto end of the zoom lens to an effective focal length fw at a wide-angle end of the zoom lens meets the following relationship: 1≤ft/fw≤3.7.

Optionally, a ratio of a movement distance D1 of the second lens group along the optical axis to a total optical length TTL of the zoom lens meets the following relationship: 0.02≤D1/TTL≤0.3.

A ratio of a movement distance D2 of the fourth lens group along the optical axis to the total optical length TTL of the zoom lens meets the following relationship: 0.02≤D2/TTL≤0.35.

Optionally, a total quantity N of lenses included in the first lens group, the second lens group, the third lens group, and the fourth lens group meets the following relationship: 7≤N≤12.

Optionally, a total quantity S of aspheric surfaces of the lenses included in the first lens group, the second lens group, the third lens group, and the fourth lens group meets the following relationship: N≤S≤2N. This further achieves a high zoom ratio of the zoom lens and effectively reduces a total length or a total height of the zoom lens.

Optionally, the lens is a lens with a special-shaped aperture.

Optionally, a height H of the lens with a special-shaped aperture along an edge direction of the lens with a special-shaped aperture meets the following relationship: 4 mm≤H≤6 mm.

Optionally, the zoom lens further includes a prism and/or a mirror reflector, and the prism and/or the mirror reflector are/is disposed on a side of the first lens group facing the object side, and are/is configured to deflect a light ray to the first lens group.

According to a second aspect, a camera module is provided, including the foregoing zoom lens.

The camera module provided in this embodiment of this application includes the zoom lens. The zoom lens can implement continuous zoom, and improve overall imaging quality and miniaturization potential of the optical focal lens. In this way, the camera module with the zoom lens can improve imaging quality, and implement miniaturization.

According to a third aspect, a terminal device is provided, including the foregoing camera module.

The terminal device provided in this embodiment of this application includes the camera module. The terminal device with the foregoing disposed module implements continuous zoom by using one lens, and thereby changes a conventional mode in which a plurality of lenses perform “jump-type zoom”. This significantly improves imaging definition in a continuous zoom process, and reduces assembly space of the lens.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 2 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 3 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 4 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 5 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 6 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 7 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 8 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 9 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 10 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to Embodiment 10 of this application;

FIG. 11 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 12 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 13 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 14 is a schematic diagram of moving statuses of a second lens group and a fourth lens group when a zoom lens changes from a wide-angle state to a telephoto state according to an embodiment of this application;

FIG. 15 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 16 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to Embodiment 2 of this application;

FIG. 17 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 18 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 19 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 20 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 21 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 22 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 23 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 24 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 25 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 26 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 27 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 28 shows axial chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 29 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 30 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 31 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 32 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 33 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 34 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 35 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 36 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 37 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 38 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 39 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to Embodiment 11 of this application;

FIG. 40 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 41 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 42 shows lateral chromatic aberration curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 43 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 44 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 45 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 46 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 47 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 48 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 49 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 50 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 51 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 52 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 53 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 54 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application;

FIG. 55 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application; and

FIG. 56 shows distortion percentage curves of the zoom lens in the wide-angle state according to an embodiment of this application.

Reference numerals in the drawings: 10-zoom lens; 11-first lens group; 12-second lens group; 13-third lens group; and 14-fourth lens group.

DESCRIPTION OF EMBODIMENTS

The following describes embodiments of this application. Examples of embodiments are shown in the accompanying drawings. Same or similar reference numerals are used to represent same or similar elements or elements having same or similar functions. Embodiments described below with reference to FIG. 1 to FIG. 56 are examples, and are intended to explain this application, but should not be understood as a limitation on this application.

It should be understood that, the terms “first” and “second” in descriptions of this application are intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or implicit indication of the number of indicated technical features. Therefore, a feature limited by “first” or “second” may explicitly or implicitly include one or more features. In the description of this application, “a plurality of” means two or more than two, unless otherwise specifically limited.

In this application, terms “installation”, “connect”, “connection”, “fix”, and the like should be understood in a broad sense unless otherwise expressly specified and limited. For example, the “connection” may be a fixed connection, a removable connection, or an integrated connection; may be a mechanical connection or an electrical connection; or may be a direct connection, an indirect connection through an intermediate medium, or a connection inside two components or a mutual relationship between two components. A person of ordinary skill in the art may interpret specific meanings of the foregoing terms in this application according to specific cases.

Proper nouns and English abbreviations used in this specification are explained as follows:

A biconvex lens is a lens whose object side surface and image side surface are both convex spherical surfaces. A middle part of the lens is thick, and an edge part is thin. The biconvex lens has a light converging function.

A focusing group is a lens group that moves in a zoom lens 10 along an optical axis of the zoom lens 10 and that is configured to adjust a focal length of the zoom lens 10.

A compensation group is a lens group that moves in the zoom lens 10 along the optical axis of the zoom lens 10 with the focusing group and that is configured to balance and eliminate an aberration impact generated by the focusing group in a moving process.

An image height (IMR) is a height from an imaging edge to a center of an imaging plane of a lens of an optical system.

An F-number is a ratio (a reciprocal of a relative aperture) of a focal length of an optical system to a diameter of a clear aperture of a lens. A smaller aperture F-number indicates more light passing through the lens per unit time period. A larger aperture F-number indicates a smaller depth of field and blurring of a background of a photo. This effect is similar to that of a telephoto lens.

An effective focal length (EFL) usually indicates a focal length of a thick lens (a lens that has a non-negligible thickness), or an optical system with several lenses or mirrors (such as a camera lens, a telescope, and a lens on a mobile terminal such as a mobile phone), to distinguish the focal length from other commonly used parameters.

A front focal length (FFL) is a distance from a front focal point of an optical system to a vertex of a first optical surface.

A back focal length (BFL) is a length from a vertex of a last optical surface of an optical system to a back focal point.

For an optical system in the air, an effective focal length is a distance from a front principal plane and a back-principal plane to corresponding focal points. If a surrounding medium is not air, then the distance is multiplied by a refractive index of the medium. These distances are referred to as front/back focal lengths, to be distinguish from front/back focal distances defined above.

A field of view (FOV) is a field of view of the zoom lens 10. In an optical system, an included angle formed, by using a lens of the optical system as a vertex, by two edges of a maximum range that an objective image of a measured object forms when passing through the lens is referred to as a field of view. The field of view determines a view range of an optical instrument. A larger field of view indicates a larger view range and smaller optical power.

A total track length (TTL) is a total optical height or a total optical length of an optical system, namely, a total length from a head of the optical system to an image.

A total track length 1 (TTL1) is a distance from a vertex of a curved surface of a first surface of an optical system to a vertex of a curved surface of a last surface of the optical system.

A telephoto end of a zoom lens 10 indicates a value range of a focal length when the zoom lens 10 is in a telephoto state.

A wide-angle end of a zoom lens 10 indicates a value range of a focal length when the zoom lens 10 is in a wide-angle state and a captured image presents a large foreground and a small distant view.

D1 is a travel distance range when the second lens group 12 moves along the optical axis as a zoom group or a compensation group.

D2 is a travel distance range when the fourth lens group 14 moves along the optical axis as a zoom group or a compensation group.

An imaging edge is an edge position of a lens of the zoom lens 10.

A center of an imaging plane is a central position of a lens of the zoom lens 10.

A zoom ratio is a ratio of a maximum focal length to a minimum focal length of the zoom lens 10.

A focal length (focal length) is a measure of how strongly an optical system converges or diverges light, and is a vertical distance from an optical center of a lens or a lens group to a focal plane when a clear image of an infinite scene is formed on the focal plane by using the lens or the lens group. From a practical perspective, the focal length may be understood as a distance from a center of a lens to an imaging plane. For a prime lens, a position of an optical center of the prime lens is fixed. For a zoom lens, a change of an optical center of the lens causes a change of a focal length of the lens.

An aperture is a device that controls an amount of light when light rays pass through a lens and enters a photosensitive surface of a body. The aperture is usually inside the lens. An aperture size is represented by F-number.

The F-number is a ratio (a reciprocal of a relative aperture) of a focal length of a lens to a diameter of a clear aperture of the lens. A smaller aperture F-number indicates more light passing through the lens per unit time period. A larger aperture F-number indicates a smaller depth of field and blurring of a background of a photo. This is similar to effect achieved by a telephoto lens.

Positive refractive power, also referred to as positive dioptric power, indicates that a lens has a positive focal length and has effect of converging light rays.

Negative refractive power, also referred to as negative dioptric power, indicates that a lens has a negative focal length and has effect of diverging light rays.

Positive focal power indicates that a zoom lens 10 refracts and converges an incident light beam. A larger positive focal power value indicates stronger refractive and converging capabilities.

Negative focal power indicates that a zoom lens 10 refracts and diverges an incident light beam. A larger negative focal power value indicates stronger refractive and diverging capabilities.

The Abbe number, namely, a dispersion coefficient, is a refractive index difference ratio of an optical material at different wavelengths, and indicates a dispersion degree of the material.

An optical axis is a light ray that passes vertically through a center of an ideal lens. When light rays parallel to the optical axis pass through a convex lens, in an ideal convex lens, all the light rays converges at one point behind the lens. This point at which all the light rays converge is a focal point.

An object side is space that is bounded by a lens and in which a photographed object is located, also referred to as object space.

An image side is space that is bounded by a lens and in which an image formed after light emitted by a photographed object passes through the lens is located, also referred to as image space.

An axial chromatic aberration is also called a longitudinal chromatic aberration, a position chromatic aberration, or an axial aberration. A beam of light rays parallel to an optical axis converges at different positions after passing through a lens. This aberration is called a position chromatic aberration or an axial chromatic aberration. This is because a lens images light with different wavelengths at different locations, so that focal planes of images of light of different colors cannot overlap during final imaging, and polychromatic light disperses to form dispersion.

A lateral chromatic aberration, also referred to as a chromatic difference of magnification, is a difference of magnification of an optical system for light of different colors. A wavelength causes a change in the magnification of the optical system, and a size of an image changes accordingly.

Distortion is a degree at which an image formed by an optical system for an object is distorted relative to the object. Distortion is caused because a height of a point at which chief rays with different fields of view intersect a Gaussian image plane after the chief rays pass through the optical system is not equal to an ideal image height due to an impact of a stop spherical aberration, and a difference between the two heights is distortion. Therefore, distortion only changes an imaging position of an off-axis object point on an ideal plane, so that a shape of an image is distorted, but definition of the image is not affected.

Optical distortion is a deformation degree obtained through optical theoretical calculation.

A diffraction limit means that an ideal object point is imaged through an optical system, and due to a diffraction limitation, it is impossible to obtain the ideal image point, but a Fraunhofer diffraction image is obtained. Since an aperture of an optical system is generally circular, the Fraunhofer diffraction image is known as an Airy disk. In this way, an image of each object point is a blur spot. It is difficult to distinguish between two blur spots after the two blur spots are close to each other. This limits a resolution of the system. A larger blur spot indicates a lower resolution.

A lens with a special-shaped aperture is a lens with an edge contour of an irregular shape instead of a conventional circular shape.

An edge direction of a lens with a special-shaped aperture is a direction in which a cutter moves when the lens is cut, and usually includes a vertical edge direction, a horizontal edge-cutting direction, or the like.

As shown in FIG. 1 to FIG. 14, embodiments of this application provide a zoom lens 10. The zoom lens 10 is used in a camera module, and the camera module with the zoom lens 10 may be used in a terminal device. The camera module may include the zoom lens 10, a voice coil motor, an infrared light filter, an image sensor, an analog-to-digital (A/D) signal converter, and a processor.

The terminal device provided in embodiments of this application may include but is not limited to a camera, a mobile phone, a tablet computer, a wearable device, a vehicle-mounted device, an augmented reality (AR) device/a virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, or a personal digital assistant (PDA). A specific type of the terminal device is not limited in embodiments of this application. For ease of description, the terminal device in an embodiment of this application is described by using a mobile phone as an example. It should be understood that this should not be construed as a limitation on this application.

In an example, the zoom lens 10 includes a first lens group 11, a second lens group 12, a third lens group 13, and a fourth lens group 14 that are sequentially arranged from an object side to an image side along an optical axis. The first lens group 11 and the third lens group 13 are fixedly disposed. The second lens group 12 and the fourth lens group 14 move along the optical axis. The first lens group 11 and the third lens group 13 are fixedly disposed to form a fixed group of zoom lens 10. The second lens group 12 and the fourth lens group 14 move along the optical axis, to implement zoom and compensation for an aberration generated during zoom.

Optionally, the second lens group 12 may be a zoom group, and the fourth lens group may be a compensation group. The second lens group 12 may continuously enlarge an imaging size of the first lens group 11 in a process of moving along the optical axis, to change a focal length of the zoom lens 10, so that the zoom lens 10 implements continuous zoom. The fourth lens group 14 with focal power may move along the optical axis in a moving process of the second lens group 12, to compensate for image plane displacement generated by the second lens group 12 in a moving process.

Alternatively, the second lens group 12 may be a compensation group, and the fourth lens group 14 may be a zoom group. This can meet a high zoom ratio of the zoom lens, and maintain good imaging definition of the zoom lens.

A first lens from the object side in the first lens group 11 is a biconvex lens. This can improve light converging performance of the first lens group 11, and prolong a back focal length of the zoom lens 10, so that the zoom lens 10 has good imaging effect and a thickness of the zoom lens 10 is reduced as much as possible. At least two lenses from the object side in the first lens group 11 are glass lenses. In this way, deep processing can be implemented on the two lenses close to the object side, so that the two lenses can be thin and have a good optical path adjustment capability. A maximum clear aperture diameter of the zoom lens 10 meets the following relationship: 4 mm≤φ≤12 mm, where y is the maximum clear aperture diameter of the zoom lens.

In addition, the maximum clear aperture diameter of the zoom lens is set within a range from 4 mm to 12 mm. This can effectively improve an amount of light passing through the zoom lens 10, and effectively prevent a depth of field from being excessively small, thereby avoiding partial blurring of an imaging background. Further, this can effectively reduce an overall height of the zoom lens, and improve luminous flux of the zoom lens. Due to the foregoing factors, this can improve overall imaging quality of the optical focal lens. In addition, the zoom lens can be made smaller, and can be easily used in a thin terminal device. In this way, the terminal device equipped with the zoom lens can implement continuous zoom, and maintain good imaging definition, thereby improving overall imaging quality of the terminal device.

In the zoom implementation, the first lens group 11 and the third lens group 13 are fastened, and the second lens group 12 and the fourth lens group 14 move. This can reduce structure complexity of the zoom lens 10, reduce engineering implementation difficulty of the zoom lens 10, and make the zoom lens 10 smaller, so that the zoom lens 10 can be easily used in a mobile terminal device such as a mobile phone.

Optionally, the maximum clear aperture diameter of the zoom lens may further meet the following relationship: 4 mm≤φ≤6 mm.

In an example, the maximum clear aperture diameter of the zoom lens is set within a range from 4 mm to 6 mm. This allows a sufficient amount of light passing through the zoom lens 10, and reduces an overall height of the zoom lens. Therefore, miniaturization potential of the zoom lens 10 is improved, and the zoom lens 10 can be used in a thinner terminal device. In addition, the zoom lens 10 provided in this embodiment further includes a stop. The stop may be located on an object side of the third lens group 13, or may be located at another location.

A camera module provided in an embodiment of this application includes the zoom lens 10. The zoom lens 10 can implement continuous zoom, and improve overall imaging quality and miniaturization potential of the zoom lens 10. In this way, the camera module with the zoom lens 10 can improve imaging quality, and implement miniaturization.

A terminal device provided in an embodiment of this application includes the camera module. The terminal device with the foregoing disposed module implements continuous zoom by using one lens, and thereby changes a conventional mode in which a plurality of lenses performs “jump-type zoom”. This significantly improves imaging definition in a continuous zoom process, and reduces assembly space of the zoom lens 10.

Optionally, the zoom lens 10 meets the following relationship: 0.8≤TTL/ft≤1.5, where TTL is a total optical length of the zoom lens 10, and ft is an effective focal length at a telephoto end of the zoom lens 10. In this way, when the zoom lens 10 changes from a wide-angle end to the telephoto end, a ratio of the total optical length to the effective focal length at the telephoto end of the zoom lens 10 is set within a range from 0.8 to 1.5. In this way, the zoom lens 10 can maintain a good width of an angle of view and a good zoom ratio, and can also correct an off-axis aberration. Optionally, a ratio of the total optical length to the effective focal length at the telephoto end of the zoom lens 10 is further set within a range from 0.8 to 1, so that a width of an angle of view and a zoom ratio of the zoom lens 10 reach an optimal state.

Optionally, the zoom lens 10 further meets the following relationship: 0.02≤IMH/ft≤0.2, where IMH is a height from an imaging edge to a center of an imaging plane of the zoom lens 10, also referred to as a half-image height, and ft is an effective focal length at the telephoto end of the zoom lens 10.

In this way, a ratio of the image height of the zoom lens 10 to the effective focal length at the telephoto end of the zoom lens 10 is set within a range from 0.02 to 0.2. This can improve a zoom ratio of the zoom lens 10, and reduce a total height of the zoom lens at the same time. Therefore, the zoom lens 10 has a smaller height and can be more easily used in a thin terminal device.

Optionally, the first lens group 11, the third lens group 13, and the fourth lens group 14 may have positive focal power, and the second lens group 12 may have negative focal power. Alternatively, the first lens group 11 and the third lens group 13 may have positive focal power, and the second lens group 12 and the fourth lens group 14 may have negative focal power. In this way, a plurality of positive and negative focal power combinations can be implemented, so that the zoom lens 10 in this embodiment has a plurality of different zoom manners, and an appropriate positive and negative focal power combination can be formed based on actual requirements for imaging quality, zoom efficiency, and a zoom ratio.

Optionally, as shown in FIG. 1 to FIG. 12, when the zoom lens 10 changes from the wide-angle end to the telephoto end, and positions of the first lens group 11 and the third lens group 13 remain unchanged, moving statuses of the second lens group 12 and the fourth lens group 14 may be as follows. The second lens group 12 moves towards the image side along the optical axis, and the fourth lens group 14 first moves towards the object side and then moves towards the image side along the optical axis. The second lens group 12 moves at a constant speed along the optical axis, to continuously adjust the focal length. The fourth lens group 14 may move at a non-constant speed relative to the second lens group 12, to dynamically compensate in real time for image plane displacement generated by the second lens group 12 in a moving process. In this way, a picture captured by the zoom lens 10 always maintains good definition and high quality in a continuous zoom process.

In addition, the second lens group 12 may also move towards the image side along the optical axis, and the fourth lens group 14 moves towards the object side along the optical axis. Alternatively, both the second lens group 12 and the fourth lens group 14 move towards the image side along the optical axis, or the second lens group 12 moves towards the image side along the optical axis, and the fourth lens group 14 first moves towards the image side and then moves towards the object side along the optical axis. The foregoing moving manners of the second lens group 12 and the fourth lens group 14 can implement change of the zoom lens 10 from the wide-angle end to the telephoto end.

Optionally, the first lens group 11 meets the following relationship: 0.2≤f1/ft≤2.3, where f1 is a focal length of the first lens group 11, and ft is an effective focal length at the telephoto end of the zoom lens 10.

A ratio of the focal length of the first lens group 11 to the effective focal length at a telephoto end of the zoom lens 10 is set within a range from 0.2 to 2.3. This can effectively improve a light converging capability of the first lens group 11, and help reduce an axial chromatic aberration.

Optionally, the first lens group 11 may further meet the following relationship: 0.2≤f1/ft≤0.69; 0.75≤f1/ft≤1.3; or 1.95≤f1/ft≤2.15, where f1 is a focal length of the first lens group 11, and ft is a focal length of the zoom lens 10.

A ratio of the focal length of the first lens group 11 to the effective focal length at a telephoto end of the zoom lens 10 is further set within a range from 0.2 to 0.69, 0.75 to 1.3, or 1.95 to 2.15. This can improve a light converging capability of the first lens group 11, reduce an axial chromatic aberration, and correct an off-axis field curvature aberration and an off-axis coma aberration, so that ideal imaging definition and imaging quality are maintained in a continuous zoom process.

Optionally, the second lens group 12 meets the following relationship: 0.02≤f2/ft≤0.6, where f₂is a focal length of the second lens group 12, and ft is an effective focal length at the telephoto end of the zoom lens 10.

A ratio of the focal length of the second lens group 12 to the effective focal length at a telephoto end of the zoom lens 10 is set within a range from 0.02 to 0.09 or 0.13 to 0.54. This can help correct an aberration generated by the second lens group 12 in a zoom process.

Optionally, the second lens group 12 may further meet the following relationship: 0.02≤f2/ft≤0.09; or 0.13≤f2/ft≤0.54, where f₂is a focal length of the second lens group 12, and ft is a focal length of the zoom lens 10.

A ratio of the focal length of the second lens group 12 to the effective focal length at a telephoto end of the zoom lens 10 is further set within a range from 0.02 to 0.09 or 0.13 to 0.54. This can help, in an example, to correct system dispersion and system spherical aberration generated by the second lens group 12 in a zoom process.

Optionally, the third lens group 13 meets the following relationship: 0.1≤f3/ft≤4.5, where f3 is a focal length of the third lens group 13, and ft is an effective focal length at the telephoto end of the zoom lens 10.

The third lens group 13 may further meet the following relationship: 0.12≤f3/ft≤0.35; 0.52≤f3/ft≤0.61; or 3.85≤f3/ft≤4.5, where f3 is a focal length of the third lens group 13, and ft is a focal length of the zoom lens 10.

A ratio of the focal length of the third lens group 13 to the effective focal length at a telephoto end of the zoom lens 10 is set within a range from 0.12 to 0.35, 0.52 to 0.61, or 3.85 to 4.5. This can improve a light converging capability of the third lens group 13, and effectively correct an off-axis field curvature aberration and an off-axis coma aberration.

Optionally, the fourth lens group 14 meets the following relationship: 0.12≤f4/ft≤200, where f4 is a focal length of the fourth lens group 14, and ft is an effective focal length at the telephoto end of the zoom lens 10.

A ratio of the focal length of the fourth lens group 14 to the effective focal length at a telephoto end of the zoom lens 10 is set within a range from 0.12 to 200. In this way, in a zoom process in which the second lens group 12 moves along the optical axis, the fourth lens group 14 can widely compensate for an aberration generated by the second lens group 12 in an entire moving process.

Optionally, the fourth lens group 14 may further meet the following relationship: 0.12≤f4/ft≤0.43; 0.65≤f4/ft≤0.85; or 70≤f4/ft≤200, where f4 is a focal length of the fourth lens group 14, and ft is a focal length of the zoom lens 10.

A ratio of the focal length of the fourth lens group 14 to the effective focal length at a telephoto end of the zoom lens 10 is further set within a range from 0.12 to 0.43, 0.65 to 0.85, or 70 to 200. In this way, in a zoom process in which the second lens group 12 moves along the optical axis, the fourth lens group 14 can effectively compensate for an aberration generated by the second lens group 12 in a moving process, and effectively correct an off-axis field curvature aberration and an off-axis coma aberration.

Optionally, a ratio of an effective focal length ft at the telephoto end of the zoom lens 10 to an effective focal length fw at the wide-angle end of the zoom lens 10 meets the following relationship: 1≤ft/fw≤3.7. This can improve a zoom ratio of the zoom lens 10 during continuous zoom from the wide-angle end to the telephoto end. This can further improve a zoom ratio of the zoom lens 10.

Optionally, a ratio of a movement distance D1 of the second lens group 12 along the optical axis to a total optical length of the zoom lens 10 (TTL) meets the following relationship: 0.02≤D1/TTL≤0.3.

A ratio of a movement distance D2 of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens 10 (TTL) meets the following relationship: 0.02≤D2/TTL≤0.35.

In an example, the ratio of the movement distance D1 of the second lens group 12 along the optical axis to the total optical length of the zoom lens 10 (TTL) and the ratio of the movement distance D2 of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens 10 may further be: 0.176≤D1/TTL≤0.215, and 0.05≤D2/TTL≤0.09; or 0.049≤D1/TTL≤0.086, and 0.21≤D2/TTL≤0.35.

In this way, the ratio of the movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens 10 and the ratio of the movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens are set within the foregoing parameter range. With reference to the foregoing parameters and movement directions of the second lens group 12 and the fourth lens group 14 along the optical axis, stable and continuous change of the zoom lens 10 from the wide-angle end to the telephoto end can be implemented, and various aberrations such as a field curvature aberration can be corrected.

Optionally, when the zoom lens 10 is at the wide-angle end, a spacing distance between the first lens group 11 and the second lens group 12 meets the following relationship: 0.5 mm≤L1≤1.35 mm; a spacing distance between the second lens group 12 and the third lens group 13 meets the following relationship: 1.8 mm≤L2≤6.0 mm; and a spacing distance between the third lens group 13 and the fourth lens group 14 meets the following relationship: 0.05 mm≤L3≤4.8 mm, where L1 is the spacing distance between the first lens group 11 and the second lens group 12, L2 is the spacing distance between the second lens group 12 and the third lens group 13, and L₃is the spacing distance between the third lens group 13 and the fourth lens group 14.

When the zoom lens 10 is at the wide-angle end, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 meet the foregoing spacing distances. This can improve imaging definition of the zoom lens 10 at the wide-angle end, increase system luminous flux, and correct distortion.

Optionally, when the zoom lens 10 is in a first intermediate focal length state, a spacing distance between the first lens group 11 and the second lens group 12 meets the following relationship: 1.05 mm≤L1≤2.95 mm.

A spacing distance between the second lens group 12 and the third lens group 13 meets the following relationship: 1.1 mm≤L2≤4.1 mm.

A spacing distance between the third lens group 13 and the fourth lens group 14 meets the following relationship:

When the zoom lens 10 is in a second intermediate focal length state, a spacing distance between the first lens group 11 and the second lens group 12 meets the following relationship: 1.3 mm≤L1≤4.2 mm.

A spacing distance between the second lens group 12 and the third lens group 13 meets the following relationship: 0.9 mm≤L2≤3.4 mm.

A spacing distance between the third lens group 13 and the fourth lens group 14 meets the following relationship: 0.05 mm≤L3≤3.1 mm.

When the zoom lens 10 is in the first intermediate focal length state and the second intermediate focal length state, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 meet the foregoing spacing distances. This can improve imaging definition of the zoom lens 10 in the first middle focal length state and the second middle focal length state.

When the zoom lens 10 is at the telephoto end, a spacing distance between the first lens group 11 and the second lens group 12 meets the following relationship: 2 mm≤L1≤6.5 mm.

A spacing distance between the second lens group 12 and the third lens group 13 meets the following relationship: 0.5 mm≤L2≤0.9 mm.

A spacing distance between the third lens group 13 and the fourth lens group 14 meets the following relationship: 0.05 mm≤L3≤5.1 mm.

When the zoom lens 10 is in the first intermediate focal length state and the second intermediate focal length state, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 meet the foregoing spacing distances. In this way, the distances between the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 cooperate to improve imaging definition of the zoom lens 10 at the telephoto end.

Optionally, a total quantity N of lenses included in the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 meets the following relationship: 7≤N≤12.

In addition, a total quantity S of aspheric surfaces of the lenses included in the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 meets the following relationship: N≤S≤2N.

In this way, a reasonable proportional relationship can be formed between the quantity of aspheric surfaces and the quantity of lenses. This further achieves a high zoom ratio of the zoom lens 10, and effectively reduces a total length or a total height of the zoom lens 10.

Optionally, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. In addition, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 12 to 24 aspheric surfaces in total.

Alternatively, the first lens group 11, the second lens group 12, and the third lens group 13 each have two lenses arranged from the object side to the image side along the optical axis, and the fourth lens group 14 has one lens arranged from the object side to the image side. In addition, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 7 to 14 aspheric surfaces in total.

In an example, a quantity of lenses in a lens group and a total quantity of aspheric surfaces are limited. This can effectively correct an aberration and avoid distortion of a field of view by combining the quantity of lenses and the aspheric surfaces of the lens. In addition, this can effectively reduce a total length of an optical path of the zoom lens 10, so that the zoom lens 10 has a high zoom ratio, good overall imaging quality, a reduced total length of the zoom lens 10. Therefore, the zoom lens 10 can be more easily used in the terminal device.

Optionally, a first lens, a second lens, and a third lens are sequentially arranged in the first lens group 11 from the object side to the image side along the optical axis. The first lens, the second lens, and the third lens meet the following relationships: 20≤V1−V2≤55; and 12≤V1−V3≤65.

Alternatively, a first lens and a second lens are sequentially arranged in the first lens group 11 from the object side to the image side along the optical axis. The first lens and the second lens meet the following relationship: 25≤V1−V2≤45.

V1 is an abbe coefficient of the first lens, V2 is an abbe coefficient of the second lens, and V3 is an abbe coefficient of the third lens.

A difference between abbe coefficients of the first lens, the second lens, and the third lens in the first lens group 11 is limited to the foregoing relationships. This can effectively reduce system dispersion through cooperation of the lenses, thereby improving imaging definition of the zoom lens, and enabling the zoom lens to present good imaging effect.

Optionally, a first lens, a second lens, and a third lens are sequentially arranged in the second lens group 12 from the object side to the image side along the optical axis. The first lens, the second lens, and the third lens meet the following relationships: −20≤V1−V2≤35; and −18≤V1−V3≤62.

Alternatively, a first lens and a second lens are sequentially arranged in the second lens group 12 from the object side to the image side along the optical axis. The first lens and the second lens meet the following relationship: −18≤V1−V2≤47.

Optionally, a first lens, a second lens, and a third lens are sequentially arranged in the third lens group 13 from the object side to the image side along the optical axis. The first lens, the second lens, and the third lens meet the following relationships: −35≤V1−V2≤67; and −12≤V1−V3≤56.

Alternatively, a first lens and a second lens are sequentially arranged in the third lens group 13 from the object side to the image side along the optical axis. The first lens and the second lens meet the following relationship: −38≤V1−V2≤42.

A difference between abbe coefficients of the first lens, the second lens, and the third lens in the second lens group 12 is limited to the foregoing relationships. This can further effectively reduce system dispersion through cooperation of the lenses, thereby further improving imaging definition of the zoom lens.

Alternatively, a first lens and a second lens are sequentially arranged in the third lens group from the object side to the image side along the optical axis. The first lens and the second lens meet the following relationship: 13≤V1−V2≤32.

A difference between abbe coefficients of the first lens, the second lens, and the third lens in the third lens group 13 is limited to the foregoing relationships. This can effectively reduce, through cooperation between the lenses, an aberration generated when the third lens group 13 moves along the optical axis, thereby further improving imaging definition of the zoom lens in a continuous zoom process.

Optionally, a first lens, a second lens, and a third lens are sequentially arranged in the fourth lens group 14 from the object side to the image side along the optical axis. The first lens, the second lens, and the third lens meet the following relationships: −19≤V1−V2≤54; and −42≤V1−V3≤55.

Alternatively, a lens is arranged in the fourth lens group 14 from the object side to the image side along the optical axis. The first lens meets the following relationship: 35≤V1≤95.

A difference between abbe coefficients of the first lens, the second lens, and the third lens in the fourth lens group 14 is limited to the foregoing relationships. This can effectively correct, through cooperation between the lenses, image plane displacement generated by the second lens group 12 in a moving process, thereby further improving imaging definition of the zoom lens in a continuous zoom process.

Optionally, the lens may be processed into a lens with a special-shaped aperture based on an actual situation. The lens is processed into a lens with a special-shaped aperture, so that the zoom lens 10 can better adapt to assembly space in a terminal. A processing technology of the lens with a special-shaped aperture may be I-CUT, D-CUT, or the like. A height of the lens with a special-shaped aperture along an edge direction of the lens with a special-shaped aperture (the edge direction is a direction in which a cutter moves when the lens is cut, and usually includes a vertical edge direction, a horizontal edge-cutting direction, or the like) meets the following relationship: 4 mm≤H≤6 mm, where H is a height of the lens with a special-shaped aperture along an edge direction of the lens with a special-shaped aperture. This can increase luminous flux of the lens and properly reduce a height direction size of the lens.

Optionally, the zoom lens 10 further includes a prism and/or a mirror reflector (that is, the zoom lens 10 may further include a prism or a mirror reflector, or may further include a prism and a mirror reflector), and the prism and/or the mirror reflector are/is disposed on a side of the first lens group 11 facing the object side, and are/is configured to deflect a light ray to the first lens group 11. The prism may be a corner cube prism. A prism or a mirror reflector may be separately disposed in the zoom lens 10, or both a prism and a mirror reflector may be disposed in the zoom lens 10. This can properly reflect and split, by disposing the prism and/or the mirror reflector, a light ray emitted to the first lens group 11.

Optionally, the zoom lens 10 may perform clear imaging at an object distance ranging from infinity to about 40 mm away from the zoom lens 10.

The following provides 14 embodiments with reference to FIG. 15 to FIG. 56 and based on the technical parameters mentioned above, to describe some specific but non-limiting examples of embodiments of this application in more detail.

Embodiment 1

In this embodiment, ratios of focal lengths of the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 to a focal length at the telephoto end of the zoom lens 10 are determined to be 0.572, 0.182, 0.28, and 0.41 respectively.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, the first lens group 11 and the third lens group 13 are fastened, the second lens group 12 moves towards the image side, and the fourth lens group 14 first moves towards the object side and then moves towards the image side.

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 7.878 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. In addition, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 19 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1936, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1329.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 1A to Table 1D.

TABLE 1A

W
M1
M2
T

Focal length (mm)
9.300
13.000
15.041
26.800

F-number
2.864
2.930
2.950
3.527

Image height IMH (mm)
2.500
2.500
2.500
2.500

Half FOV (°)
15.488
10.774
9.257
5.139

BFL (mm)
4.142
4.703
4.713
1.323

TTL (mm)
25.500
25.500
25.500
25.500

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 1A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, a first intermediate focal length, a second intermediate focal length, and the telephoto end when wavelengths of the zoom lens are respectively 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm. W indicates the wide-angle state, M1 indicates the first intermediate focal length state, M2 indicates the second intermediate focal length state, T indicates the telephoto state, BFL indicates a back focal length (of the zoom lens 10), TTL indicates a total length (of the lens) from a head of a lens tube to an imaging plane, FOV indicates a field of view in degrees, and an F-number indicates a ratio of a focal length of the zoom lens 10 to a diameter of a clear aperture of the zoom lens 10. It can be seen from Table 1A that when the image height and TTL remain unchanged, both the focal length and the F-number increase.

TABLE 1B

R
Thickness
nd
vd

R1
9.427
d1
1.786
n1
1.55
v1
69.0

R2
−12.819
a1
0.070

R3
−48.300
d2
0.360
n2
1.95
v2
17.9

R4
−45.863
a2
0.071

R5
−43.002
d3
0.360
n3
1.82
v3
23.1

R6
42.580
a3
0.662

R7
−145.963
d4
0.456
n4
1.87
v4
19.4

R8
−27.629
a4
0.411

R9
−7.072
d5
0.360
n5
1.69
v5
54.3

R10
3.656
a5
0.144

R11
3.569
d6
0.558
n6
1.95
v6
17.9

R12
4.436
a6
5.436

R13
3.432
d7
1.636
n7
1.55
v7
69.1

R14
−8.146
a7
0.695

R15
−287.23
d8
1.717
n8
1.76
v8
22.6

R16
4.927
a8
1.156

R17
−8.684
d9
0.570
n9
1.85
v9
42.7

R18
−11.222
a9
0.995

R19
5.139
d10
0.748
n10
1.64
v10
35.6

R20
9.417
a10
1.904

R21
48.091
d11
0.360
n11
1.60
v11
35.1

R22
5.641
a11
0.070

R23
5.343
d12
0.831
n12
1.70
v12
34.7

R24
Infinity
a12
3.332

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 1B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient. In this application, the foregoing parameter symbols have the same meanings, and details are not described below again.

TABLE 1C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.57E−04
−1.75E−05
4.21E−06
−5.64E−07
3.58E−08
−9.42E−10

aspheric

R2
Even
0.00
5.82E−04
−6.39E−06
−1.03E−06
1.02E−07
−2.88E−09
−6.23E−11

aspheric

R5
Even
0.00
2.28E−05
2.28E−05
5.41E−07
−1.83E−07
1.00E−08
0.00E+00

aspheric

R6
Even
0.00
1.59E−05
1.18E−05
6.01E−06
−9.98E−07
6.45E−08
−1.31E−09

aspheric

R9
Even
0.00
3.10E−04
2.39E−04
−4.19E−05
2.69E−06
1.22E−07
−1.60E−08

aspheric

R10
Even
0.00
−1.85E−03
−5.13E−05
−4.35E−05
7.06E−06
−9.06E−07
5.54E−08

aspheric

R11
Even
0.00
−3.68E−03
−3.68E−04
−6.99E−06
3.03E−06
−6.95E−07
−3.36E−08

aspheric

R12
Even
0.00
−4.19E−03
−1.70E−04
2.23E−06
−6.71E−07
−3.60E−07
−3.49E−08

aspheric

R13
Even
0.00
−1.94E−03
−8.37E−05
−1.03E−05
3.96E−07
−1.54E−07
1.44E−08

aspheric

R14
Even
0.00
2.23E−03
−5.47E−05
8.42E−06
−2.20E−06
4.48E−07
−2.59E−08

aspheric

R15
Even
0.00
−5.87E−04
8.27E−05
3.00E−05
−3.37E−06
5.40E−07
−1.04E−07

aspheric

R16
Even
0.00
2.95E−03
7.03E−04
2.03E−04
8.18E−06
−5.31E−07
−4.88E−08

aspheric

R17
Even
0.00
1.19E−02
3.87E−06
1.25E−04
−3.21E−05
9.48E−07
−1.43E−08

aspheric

R18
Even
0.00
1.04E−02
9.61E−05
5.52E−05
−2.16E−05
1.81E−08
1.46E−09

aspheric

R19
Even
0.00
−3.38E−03
−2.18E−04
−4.42E−05
6.37E−06
−3.46E−07
−4.87E−08

aspheric

R20
Even
0.00
−4.21E−03
−1.76E−04
−3.10E−05
7.57E−06
−9.79E−07
1.57E−08

aspheric

R21
Even
0.00
−1.36E−03
5.30E−04
−3.27E−05
9.47E−07
2.63E−08
−7.77E−10

aspheric

R22
Even
−1.29
−2.63E−04
−4.54E−04
9.55E−06
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
−2.70E−04
−9.03E−04
9.09E−05
−1.12E−05
7.06E−07
−1.73E−08

aspheric

In Table 1C, R1 to R23 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 1C that, in Embodiment 1, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 19 aspheric surfaces in total.

After the aspheric coefficients are obtained, the aspheric coefficients may be substituted into the following formula to obtain a solution:

$\begin{matrix} z = \frac{{cr}^{2}}{1 + \sqrt{1 - {Kc}^{2} r^{2}}} + A_{2} r^{4} + A_{3} r^{6} + A_{4} r^{8} + A_{5} r^{10} + A_{6} r^{12} + A_{7} r^{14} & (1) \end{matrix}$

In formula (1), z indicates a vector height of the aspheric surface, r indicates a radial coordinate of the aspheric surface, and c is a spherical curvature of a vertex on the aspheric surface.

TABLE 1D

W
M1
M2
T

a3
0.662 mm
2.360 mm
3.070 mm
5.599 mm

a6
5.436 mm
3.739 mm
3.029 mm
0.500 mm

a9
0.995 mm
0.434 mm
0.424 mm
3.814 mm

a12
3.332 mm
3.893 mm
3.903 mm
0.513 mm

Table 1D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 15 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths (555 nm, 510 nm, 610 nm, 470 nm, and 650 nm, and different wavelengths appearing in the following all use the foregoing five wavelength values). It can be seen from FIG. 15 that, in Embodiment 1, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.01 mm to 0.02 mm.

FIG. 29 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 29 that, in Embodiment 1, a lateral chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a lateral diffraction limit range.

FIG. 43 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 43 that, in Embodiment 1, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 4%.

Embodiment 2

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 7.8 mm.

In this case, the first lens group 11, the second lens group 12, and the third lens group 13 each have two lenses arranged from the object side to the image side along the optical axis, and the fourth lens group 14 has one lens arranged. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 14 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.2036, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1385.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 2A to Table 2D.

TABLE 2A

W
M1
M2
T

Focal length (mm)
9.300
13.000
15.041
26.800

F-number
2.879
2.954
2.976
3.505

Image height IMH (mm)
2.500
2.500
2.500
2.500

Half FOV (°)
15.493
10.833
9.309
5.175

BFL (mm)
7.521
8.054
8.098
4.566

TTL (mm)
25.500
25.500
25.500
25.500

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 2A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 2A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 2B

R
Thickness
nd
vd

R1
8.516
d1
1.870
n1
1.55
v1
70.0

R2
−17.274
a1
0.277

R3
49.166
d2
0.360
n2
1.84
v2
21.9

R4
16.993
a2
1.303

R5
−9.476
d3
0.360
n3
1.69
v3
54.3

R6
3.537
a3
0.258

R7
3.809
d4
0.569
n4
1.95
v4
17.9

R8
4.952
a4
5.692

R9
3.457
d5
1.694
n5
1.55
v5
70.2

R10
−10.754
a5
0.702

R11
41.187
d6
1.361
n6
1.74
v6
23.6

R12
3.982
a6
2.083

R13
8.275
d7
1.450
n7
1.63
v7
34.5

R14
−32.609
a7
6.711

R15
Infinity
d8
0.210
n8
1.76
v8
22.6

R16
Infinity
a8
0.600

Table 2B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R16 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 2C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.29E−04
−1.59E−05
4.12E−06
−5.65E−07
3.63E−08
−9.47E−10

aspheric

R2
Even
0.00
5.13E−04
−6.75E−06
−1.04E−06
1.03E−07
−2.86E−09
−7.43E−11

aspheric

R3
Even
0.00
2.66E−06
2.00E−05
6.59E−07
−1.77E−07
1.02E−08
0.00E+00

aspheric

R4
Even
0.00
3.43E−05
1.34E−05
5.70E−06
−9.74E−07
6.70E−08
−1.36E−09

aspheric

R5
Even
0.00
−2.66E−04
2.00E−04
−4.11E−05
3.03E−06
1.93E−07
−2.40E−08

aspheric

R6
Even
0.00
−1.81E−03
−9.23E−05
−6.03E−05
3.61E−06
−1.07E−08
5.50E−08

aspheric

R7
Even
0.00
−3.23E−03
−3.88E−04
−1.63E−05
−1.27E−06
−3.13E−07
−3.28E−08

aspheric

R8
Even
0.00
−3.96E−03
−2.32E−04
−6.80E−06
−2.77E−06
−2.32E−07
−3.53E−08

aspheric

R9
Even
0.00
−1.66E−03
−2.64E−05
−5.78E−06
8.57E−07
−8.58E−08
6.82E−09

aspheric

R10
Even
0.00
2.35E−03
−4.25E−05
1.08E−05
−2.17E−06
4.23E−07
−3.02E−08

aspheric

R11
Even
0.00
8.84E−05
−6.55E−05
−1.09E−05
2.88E−06
−1.73E−07
−1.06E−07

aspheric

R12
Even
0.00
1.88E−03
1.78E−04
5.31E−05
9.79E−06
−6.76E−07
−4.88E−08

aspheric

R13
Even
0.00
−1.05E−03
−1.82E−04
−3.36E−05
3.37E−06
−1.67E−07
−3.83E−08

aspheric

R14
Even
0.00
−1.01E−03
−1.74E−04
−3.27E−05
3.73E−06
−3.88E−07
7.17E−09

aspheric

In Table 2C, R1 to R14 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 2C that, in Embodiment 2, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 14 aspheric surfaces in total.

Table 2D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 16 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 16 that, in Embodiment 2, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.015 mm to 0.025 mm.

FIG. 30 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 26 that, in Embodiment 2, for lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at the wide-angle end and the telephoto end at different wavelengths, a light ray with a wavelength of 650 nm and a light ray with a wavelength of 470 nm exceeds lateral diffraction limits.

TABLE 2D

W
M1
M2
T

a2
1.303 mm
2.925 mm
3.622 mm
6.495 mm

a4
5.692 mm
4.071 mm
3.373 mm
0.500 mm

a6
2.083 mm
1.550 mm
1.506 mm
5.038 mm

a7
6.711 mm
7.244 mm
7.288 mm
3.756 mm

FIG. 44 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 44 that, in Embodiment 2, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 3.8%.

Embodiment 3

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.654 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1960, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1789.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 3A to Table 3D.

TABLE 3A

W
M1
M2
T

Focal length (mm)
9.300
13.000
15.041
26.797

F-number
2.786
2.872
2.908
3.625

Image height IMH (mm)
2.500
2.500
2.500
2.500

Half FOV (°)
15.143
10.992
9.474
5.277

BFL (mm)
0.860
1.954
2.516
5.423

TTL (mm)
25.500
25.500
25.500
25.500

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 3A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 3A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 3B

R
Thickness
nd
vd

R
7.078
d1
2.196
n1
1.56
v1
67.3

R2
−29.021
a1
0.070

R3
−367.032
d2
0.369
n2
1.65
v2
29.9

R4
−323.264
a2
0.070

R5
48.946
d3
0.360
n3
1.93
v3
24.7

R6
8.115
a3
0.500

R7
7.212
d4
0.875
n4
1.93
v4
18.2

R8
14.459
a4
0.890

R9
−10.416
d5
0.360
n5
1.69
v5
54.1

R10
4.019
a5
0.050

R11
3.492
d6
0.474
n6
1.95
v6
17.9

R12
3.856
a6
5.499

R13
3.982
d7
2.118
n7
1.57
v7
66.4

R14
−6.900
a7
0.070

R15
86.504
d8
0.360
n8
1.93
v8
24.2

R16
6.032
a8
0.050

R17
4.494
d9
0.566
n9
1.50
v9
81.6

R18
4.734
a9
4.613

R19
3.434
d10
2.039
n10
1.57
v10
41.6

R20
26.077
a10
1.925

R21
−8.158
d11
0.360
n11
1.91
v11
35.3

R22
18.132
a11
0.354

R23
−278.845
d12
0.472
n12
1.50
v12
81.6

R24
10.229
a12
0.050

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 3B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 3C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
−7.88E−05
−1.69E−05
4.67E−06
−5.82E−07
3.45E−08
−8.17E−10

aspheric

R2
Even
0.00
5.55E−04
−2.91E−06
−8.76E−07
1.08E−07
−3.27E−09
−5.88E−11

aspheric

R3
Even
0.00
3.10E−05
−1.85E−07
2.36E−07
1.48E−08
1.33E−09
7.27E−11

aspheric

R4
Even
0.00
−3.68E−05
1.34E−06
−8.48E−08
4.41E−09
7.55E−10
9.43E−11

aspheric

R5
Even
0.00
1.52E−04
1.98E−05
3.86E−07
−2.24E−07
8.12E−09
0.00E+00

aspheric

R6
Even
0.00
−9.44E−05
2.70E−05
5.09E−06
−1.04E−06
6.51E−08
−1.19E−09

aspheric

R7
Even
0.00
2.11E−04
3.13E−05
−2.04E−06
−1.00E−07
4.60E−09
−3.21E−10

aspheric

R8
Even
0.00
1.09E−05
−7.62E−06
−1.40E−06
−3.10E−07
−1.54E−08
2.08E−09

aspheric

R9
Even
0.00
−1.99E−04
1.53E−04
−3.73E−05
3.20E−06
−9.33E−08
5.25E−10

aspheric

R10
Even
0.00
−1.87E−03
−1.19E−06
−4.89E−05
6.45E−06
−1.02E−06
4.73E−08

aspheric

R11
Even
0.00
−4.07E−03
−3.38E−04
−4.37E−07
1.86E−06
−8.23E−07
3.13E−08

aspheric

R12
Even
0.00
−4.16E−03
−1.47E−04
−5.91E−06
2.06E−06
−4.68E−07
1.69E−08

aspheric

R13
Even
0.00
−2.17E−03
−3.78E−05
−1.06E−05
−6.10E−07
−2.60E−07
4.49E−09

aspheric

R14
Even
0.00
2.30E−03
−1.54E−04
7.41E−06
−2.90E−06
3.22E−07
−1.69E−08

aspheric

R15
Even
0.00
−3.21E−04
3.67E−04
3.33E−05
−3.26E−06
5.46E−07
−3.62E−08

aspheric

R16
Even
0.00
1.86E−03
3.83E−04
9.45E−05
−1.30E−06
−3.63E−07
−3.51E−08

aspheric

R17
Even
0.00
8.84E−03
−2.75E−04
1.97E−04
−4.99E−05
2.49E−06
−3.23E−08

aspheric

R18
Even
0.00
5.41E−03
3.02E−04
−4.30E−07
−2.06E−05
3.94E−07
4.92E−08

aspheric

R19
Even
0.00
−2.33E−03
−9.78E−05
−2.06E−05
−2.43E−06
5.68E−07
−5.32E−08

aspheric

R20
Even
0.00
−7.99E−03
3.66E−04
−2.31E−05
6.78E−06
−9.28E−07
3.43E−08

aspheric

R21
Even
0.00
−1.43E−02
3.17E−04
5.59E−04
−5.66E−05
8.54E−07
−1.37E−09

aspheric

R22
Even
−1.29
1.91E−02
5.84E−05
−1.89E−04
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
2.12E−02
−2.51E−03
1.07E−04
1.48E−05
−2.81E−06
−1.82E−08

aspheric

R24
Even
0.00
−2.20E−02
1.98E−03
−3.88E−05
−2.16E−05
3.58E−15
2.68E−16

aspheric

In Table 3C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 3C that, in Embodiment 3, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 3D

W
M1
M2
T

a3
0.500 mm
2.556 mm
3.301 mm
5.499 mm

a6
5.499 mm
3.444 mm
2.698 mm
0.500 mm

a9
4.613 mm
3.519 mm
2.956 mm
0.050 mm

al2
0.050 mm
1.144 mm
1.706 mm
4.613 mm

Table 3D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 17 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 17 that, in Embodiment 3, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.014 mm to 0.021 mm.

FIG. 31 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 31 that, in Embodiment 3, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at the wide-angle end and in the first intermediate focal length state and the second intermediate focal length state at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 45 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 45 that, in Embodiment 3, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 4%.

Embodiment 4

When the zoom lens 10 changes from the wide-angle end to the telephoto end, the first lens group 11 and the third lens group 13 are fastened, and both the second lens group 12 and the fourth lens group 14 moves towards the image side.

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 7.8 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.0516, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.2114.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 4A to Table 4D.

TABLE 4A

W
M1
M2
T

Focal length (mm)
9.300
13.000
15.041
26.799

F-number
2.859
2.896
2.910
3.581

Image height IMH (mm)
2.500
2.500
2.500
2.500

Half FOV (°)
14.910
10.602
9.163
5.165

BFL (mm)
6.250
5.333
4.642
1.310

TTL (mm)
25.500
25.500
25.500
25.500

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 4A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 4A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 4B

R
Thickness
nd
vd

R1
6.565
d1
1.725
n1
1.60
v1
62.7

R2
−519.634
a1
0.070

R3
10.293
d2
1.132
n2
1.77
v2
49.6

R4
−34.748
a2
0.081

R5
−27.500
d3
0.550
n3
1.95
v3
18.1

R6
96.151
a3
0.709

R7
−14.145
d4
0.621
n4
1.92
v4
27.8

R8
2.868
a4
0.733

R9
−38.022
d5
0.360
n5
1.88
v5
39.9

R10
4.553
a5
0.161

R11
6.223
d6
0.760
n6
1.95
v6
17.9

R12
−64.985
a6
1.815

R13
3.763
d7
1.708
n7
1.58
v7
47.2

R14
−10.848
a7
2.252

R15
−11.720
d8
0.360
n8
1.91
v8
22.5

R16
16.761
a8
0.500

R17
−4.730
d9
0.360
n9
1.50
v9
74.9

R18
−4.938
a9
0.050

R19
122.662
d10
0.843
n10
1.95
v10
17.9

R20
−14.727
a10
2.273

R21
−69.972
d11
0.200
n11
1.95
v11
17.9

R22
6.660
a11
0.016

R23
6.722
d12
1.972
n12
1.82
V12
44.8

R24
−6.281
a12
5.440

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 4B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 4C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.32E−04
−1.09E−05
3.91E−06
−5.42E−07
3.55E−08
−1.07E−09

aspheric

R2
Even
0.00
5.21E−04
−3.50E−06
−1.07E−06
8.85E−08
−3.31E−09
−9.38E−11

aspheric

R3
Even
0.00
−1.40E−04
−3.66E−06
3.14E−08
4.67E−08
9.03E−10
−6.61E−11

aspheric

R4
Even
0.00
1.27E−04
9.00E−06
2.41E−07
1.09E−08
6.45E−10
2.83E−12

aspheric

R5
Even
0.00
2.17E−04
3.53E−05
1.60E−06
−1.27E−07
1.11E−08
0.00E+00

aspheric

R6
Even
0.00
−2.03E−05
4.54E−05
7.53E−06
−9.14E−07
7.65E−08
−1.31E−09

aspheric

R7
Even
0.00
1.02E−03
1.02E−04
−2.81E−05
2.77E−06
−4.31E−15
4.20E−17

aspheric

R8
Even
0.00
−2.16E−03
2.78E−04
−1.78E−05
−2.06E−05
1.57E−16
1.35E−18

aspheric

R9
Even
0.00
−8.31E−05
7.69E−05
−1.73E−04
−3.35E−05
4.57E−06
−1.32E−06

aspheric

R10
Even
0.00
−1.82E−03
−3.50E−04
−1.33E−04
−2.33E−05
3.69E−06
5.54E−08

aspheric

R11
Even
0.00
−3.35E−03
−2.50E−04
−3.46E−05
2.00E−06
5.25E−07
−3.36E−08

aspheric

R12
Even
0.00
−4.26E−03
−2.80E−04
−1.71E−05
−1.23E−05
3.78E−06
−3.49E−08

aspheric

R13
Even
0.00
−1.18E−03
5.00E−05
−1.33E−05
6.32E−07
2.26E−07
−3.77E−08

aspheric

R14
Even
0.00
1.47E−03
5.53E−05
1.89E−05
−3.53E−06
−1.09E−07
1.39E−08

aspheric

R15
Even
0.00
−2.79E−03
1.72E−05
−3.39E−05
−2.56E−05
−1.60E−06
−1.04E−07

aspheric

R16
Even
0.00
4.99E−03
1.05E−03
1.78E−04
−5.28E−05
−5.31E−07
−4.88E−08

aspheric

R17
Even
0.00
1.49E−02
7.10E−04
2.24E−04
−4.20E−05
−1.15E−06
−1.43E−08

aspheric

R18
Even
0.00
6.52E−03
−6.84E−04
−9.64E−07
−2.20E−05
1.81E−08
1.46E−09

aspheric

R19
Even
0.00
−4.69E−03
−5.21E−05
−4.94E−05
2.83E−06
−5.96E−07
5.30E−08

aspheric

R20
Even
0.00
−3.98E−03
8.20E−05
−5.90E−05
5.39E−06
−4.37E−07
2.24E−08

aspheric

R21
Even
0.00
−1.61E−03
2.47E−04
−5.69E−05
6.37E−06
−3.42E−07
8.49E−09

aspheric

R22
Even
−2.43
−4.28E−04
−3.91E−04
2.93E−05
−4.04E−07
−5.08E−09
3.30E−10

aspheric

R23
Even
0.00
−3.41E−04
−6.80E−04
9.03E−05
−7.30E−06
3.84E−07
−8.50E−09

aspheric

R24
Even
0.00
3.29E−04
−2.28E−05
3.17E−06
−1.75E−07
−1.70E−08
1.68E−09

aspheric

In Table 4C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 4C that, in Embodiment 4, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 4D

W
M1
M2
T

a3
0.709 mm
1.375 mm
1.599 mm
2.024 mm

a6
1.815 mm
1.148 mm
0.924 mm
0.500 mm

a9
0.050 mm
0.967 mm
1.658 mm
4.990 mm

a12
5.440 mm
4.523 mm
3.832 mm
0.500 mm

Table 4D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 18 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 18 that, in Embodiment 4, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.010 mm to 0.012 mm.

FIG. 32 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 32 that, in Embodiment 4, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at the wide-angle end and in the first intermediate focal length state at different wavelengths can be controlled around a lateral diffraction limit range. When the zoom lens 10 zooms to the second intermediate focal length state and even the telephoto end, a light ray with a wavelength of 650 nm and a light ray with a wavelength of 470 nm exceeds lateral diffraction limits.

FIG. 46 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 46 that, in Embodiment 4, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.9%. Therefore, the zoom lens 10 using the foregoing technical parameters can effectively control the distortion rate.

Embodiment 5

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.0 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

A ratio of a total optical length of the zoom lens 10 to an effective focal length at the telephoto end of the zoom lens 10 is determined to be 1.275, and a ratio of an image height of the zoom lens 10 to the effective focal length at the telephoto end of the zoom lens 10 is determined to be 0.125.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.2029, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1249.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 5A to Table 5D.

TABLE 5A

W
M1
M2
T

Focal length (mm)
9.300
13.000
15.041
20.000

F-number
2.757
2.810
2.829
3.467

Image height IMH (mm)
2.500
2.500
2.500
2.500

Half FOV (°)
14.949
10.679
9.241
6.934

BFL (mm)
5.982
5.209
4.578
2.796

TTL (mm)
25.500
25.500
25.500
25.500

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 5A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 5A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 5B

R
Thickness
nd
Vd

R1
10.741
d1
1.720
n1
1.53
v1
72.5

R2
−11.209
a1
0.070

R3
−19.120
d2
0.361
n2
1.92
v2
18.7

R4
−19.045
a2
0.070

R5
−18.852
d3
0.360
n3
1.86
v3
27.7

R6
447.613
a3
0.289

R7
−45.608
d4
0.472
n4
1.51
v4
78.9

R8
3.930
a4
0.607

R9
6.223
d5
0.360
n5
1.57
v5
41.3

R10
3.288
a5
0.051

R11
3.326
d6
0.847
n6
1.91
v6
31.6

R12
5.662
a6
5.981

R13
3.596
d7
1.914
n7
1.55
v7
53.5

R14
−9.000
a7
0.211

R15
26.179
d8
1.127
n8
1.83
v8
32.4

R16
6.629
a8
0.256

R17
123.695
d9
0.375
n9
1.64
v9
46.7

R18
5.377
a9
1.412

R19
−3.175
d10
0.360
n10
1.91
v10
24.9

R20
−6.651
a10
0.200

R21
−12.354
d11
1.355
n11
1.77
v11
49.7

R22
−3.442
a11
0.167

R23
5.358
d12
0.954
n12
1.51
v12
79.1

R24
8.575
a12
5.172

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 5B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 5C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
−4.65E−05
−2.37E−05
4.31E−06
−5.64E−07
3.51E−08
−9.30E−10

aspheric

R2
Even
0.00
5.99E−04
−8.15E−06
−1.03E−06
1.03E−07
−3.34E−09
−5.75E−11

aspheric

R3
Even
0.00
1.31E−05
1.50E−06
9.31E−08
1.64E−08
0.00E+00
0.00E+00

aspheric

R4
Even
0.00
6.48E−06
3.84E−06
3.91E−07
1.37E−08
0.00E+00
0.00E+00

aspheric

R5
Even
0.00
1.63E−04
2.75E−05
4.44E−07
−1.98E−07
9.04E−09
0.00E+00

aspheric

R6
Even
0.00
−1.07E−04
8.89E−06
6.08E−06
−1.02E−06
6.09E−08
−1.22E−09

aspheric

R7
Even
0.00
4.16E−04
−6.89E−05
4.51E−06
−1.41E−07
0.00E+00
0.00E+00

aspheric

R8
Even
0.00
−1.16E−03
1.26E−04
5.91E−06
−2.99E−06
0.00E+00
0.00E+00

aspheric

R9
Even
0.00
3.25E−04
1.62E−04
−5.55E−05
1.27E−06
−1.88E−07
1.26E−08

aspheric

R10
Even
0.00
−2.78E−03
−3.72E−04
−8.06E−05
5.24E−06
−7.68E−07
3.00E−08

aspheric

R11
Even
0.00
−4.52E−03
−3.52E−04
−1.17E−05
1.28E−06
6.35E−07
−5.73E−08

aspheric

R12
Even
0.00
−2.69E−03
−8.50E−05
−8.45E−06
6.94E−06
2.87E−07
−2.71E−08

aspheric

R13
Even
0.00
−9.59E−04
−5.78E−05
−1.50E−05
−3.54E−07
−2.44E−07
2.02E−08

aspheric

R14
Even
0.00
1.68E−03
−1.47E−04
1.70E−06
−1.95E−06
6.78E−07
−3.19E−08

aspheric

R15
Even
0.00
−3.20E−04
1.26E−04
2.31E−05
−5.04E−06
1.57E−06
−1.04E−07

aspheric

R16
Even
0.00
4.38E−03
2.37E−03
2.44E−04
7.05E−05
−5.31E−07
−4.88E−08

aspheric

R17
Even
0.00
1.19E−02
7.21E−04
3.70E−04
−5.23E−06
9.48E−07
−1.43E−08

aspheric

R18
Even
0.00
1.05E−02
−1.38E−03
1.11E−04
−5.14E−05
1.81E−08
1.46E−09

aspheric

R19
Even
0.00
−7.56E−03
4.08E−04
−3.25E−04
7.99E−05
−1.13E−05
−4.87E−08

aspheric

R20
Even
0.00
−2.57E−03
2.41E−04
−6.90E−06
−6.55E−06
−1.32E−07
1.57E−08

aspheric

R21
Even
0.00
3.56E−03
−6.63E−05
−7.66E−05
1.34E−05
−1.10E−06
3.45E−08

aspheric

R22
Even
−0.26
1.29E−03
−2.25E−04
2.93E−05
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
3.84E−04
−8.44E−04
1.03E−04
−9.90E−06
7.89E−07
−2.24E−08

aspheric

R24
Even
0.00
−9.65E−04
−2.68E−04
−1.13E−05
2.75E−06
0.00E+00
0.00E+00

aspheric

In Table 5C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 5C that, in Embodiment 5, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 5D

W
M1
M2
T

a3
0.289 mm
3.115 mm
4.144 mm
5.464 mm

a6
5.981 mm
3.155 mm
2.127 mm
0.806 mm

a9
1.412 mm
2.185 mm
2.816 mm
4.598 mm

a12
5.172 mm
4.399 mm
3.768 mm
1.986 mm

Table 5D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 19 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 19 that, in Embodiment 5, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.13 mm to 0.03 mm.

FIG. 33 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 33 that, in Embodiment 5, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 47 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 47 that, in Embodiment 5, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.9%.

Embodiment 6

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.322 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1814, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.065.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 6A to Table 6D.

TABLE 6A

W
M1
M2
T

Focal length (mm)
9.419
13.075
15.106
26.678

F-number
2.942
2.994
3.029
3.603

Image height IMH (mm)
2.500
2.500
2.500
2.500

Half FOV (°)
14.570
11.063
9.347
5.166

BFL (mm)
1.175
2.591
2.834
1.759

TTL (mm)
25.475
25.475
25.475
25.475

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 6A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 6A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 6B

R
Thickness
nd
vd

R1
9.094
d1
1.893
n1
1.55
v1
69.7

R2
−13.879
a1
0.079

R3
−38.457
d2
0.364
n2
1.68
v2
26.8

R4
−36.805
a2
0.082

R5
−30.128
d3
0.441
n3
1.83
v3
23.9

R6
158.546
a3
0.865

R7
−22.372
d4
0.413
n4
1.71
v4
31.3

R8
−14.879
a4
0.322

R9
−6.345
d5
0.364
n5
1.74
v5
50.6

R10
3.750
a5
0.058

R11
3.432
d6
0.792
n6
1.91
v6
18.8

R12
4.205
a6
5.117

R13
3.380
d7
1.997
n7
1.57
v7
64.6

R14
−7.053
a7
0.717

R15
−235.843
d8
2.000
n8
1.87
v8
20.4

R16
23.373
a8
2.276

R17
−9.231
d9
1.616
n9
1.94
v9
18.8

R18
4.220
a9
1.773

R19
5.107
d10
0.958
n10
1.84
v10
29.7

R20
9.566
a10
0.065

R21
9.909
d11
1.057
n11
1.73
v11
24.1

R22
9.575
a11
0.051

R23
5.228
d12
1.000
n12
1.83
v12
20.4

R24
−32.551
a12
0.376

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.589

Table 6B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 6C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.45E−04
−1.83E−05
4.23E−06
−5.63E−07
3.57E−08
−9.56E−10

aspheric

R2
Even
0.00
5.95E−04
−7.00E−06
−1.06E−06
9.82E−08
−3.21E−09
−5.80E−11

aspheric

R3
Even
0.00
1.97E−05
1.13E−06
2.60E−08
2.53E−09
0.00E+00
0.00E+00

aspheric

R4
Even
0.00
−2.32E−05
−5.68E−07
7.08E−08
5.98E−09
0.00E+00
0.00E+00

aspheric

R5
Even
0.00
4.87E−05
2.41E−05
5.17E−07
−1.83E−07
1.00E−08
0.00E+00

aspheric

R6
Even
0.00
−2.46E−06
1.24E−05
6.24E−06
−9.98E−07
6.35E−08
−1.27E−09

aspheric

R7
Even
0.00
−4.38E−05
5.77E−07
−1.63E−06
−3.73E−07
0.00E+00
0.00E+00

aspheric

R8
Even
0.00
−9.70E−05
−8.82E−06
−2.70E−06
2.88E−07
0.00E+00
0.00E+00

aspheric

R9
Even
0.00
5.08E−04
2.32E−04
−3.73E−05
2.53E−06
7.72E−08
−8.79E−09

aspheric

R10
Even
0.00
−1.77E−03
−2.31E−05
−5.00E−05
7.11E−06
−9.73E−07
5.31E−08

aspheric

R11
Even
0.00
−3.77E−03
−4.12E−04
−3.18E−06
3.08E−06
−2.57E−07
−3.07E−08

aspheric

R12
Even
0.00
−4.39E−03
−1.72E−04
1.49E−06
3.50E−06
−2.67E−07
−3.95E−08

aspheric

R13
Even
0.00
−2.37E−03
−1.39E−04
−1.62E−05
2.76E−07
−1.18E−07
9.68E−09

aspheric

R14
Even
0.00
2.29E−03
−6.53E−05
1.10E−05
−2.45E−06
3.63E−07
−1.07E−08

aspheric

R15
Even
0.00
−8.36E−04
2.22E−04
3.91E−05
−1.41E−06
5.13E−07
−1.27E−07

aspheric

R16
Even
0.00
3.28E−03
1.01E−03
1.45E−05
5.08E−05
−5.54E−07
−4.90E−08

aspheric

R17
Even
0.00
3.34E−03
−1.31E−03
2.40E−04
−2.56E−05
9.58E−07
−1.42E−08

aspheric

R18
Even
0.00
2.07E−03
−1.70E−03
1.61E−04
−6.21E−06
−7.09E−09
1.27E−09

aspheric

R19
Even
0.00
−5.48E−04
−2.43E−04
−1.07E−05
5.54E−06
−4.38E−07
−2.83E−09

aspheric

R20
Even
0.00
−2.54E−03
7.76E−06
−4.42E−05
1.08E−05
−1.05E−06
2.88E−08

aspheric

R21
Even
0.00
−2.96E−04
5.56E−04
−6.83E−05
3.59E−06
6.45E−08
−5.65E−09

aspheric

R22
Even
5.39
1.22E−03
−3.29E−04
3.25E−05
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
−4.25E−04
−5.79E−04
7.65E−05
−7.71E−06
4.68E−07
−1.11E−08

aspheric

R24
Even
0.00
−6.14E−04
9.52E−05
−4.96E−06
−5.26E−08
0.00E+00
0.00E+00

aspheric

In Table 6C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 6C that, in Embodiment 6, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 6D

W
M1
M2
T

a3
0.865 mm
2.663 mm
3.206 mm
5.464 mm

a6
5.117 mm
3.319 mm
2.776 mm
0.518 mm

a9
1.773 mm
0.357 mm
0.114 mm
1.188 mm

a12
0.376 mm
1.792 mm
2.035 mm
0.960 mm

Table 6D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 20 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 20 that, in Embodiment 6, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.03 mm to 0.06 mm.

FIG. 34 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 34 that, in Embodiment 6, lateral diffraction limits for lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at the wide-angle end and the telephoto end are narrow at different wavelengths. Accordingly, a light ray with a wavelength of 650 nm and a light ray with a wavelength of 470 nm exceeds the lateral diffraction limits at the wide-angle end and the telephoto end, but can be controlled around a lateral diffraction limit range.

FIG. 48 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 48 that, in Embodiment 6, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.7%.

Embodiment 7

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.144 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

A ratio of a total optical length of the zoom lens 10 to an effective focal length at the telephoto end of the zoom lens 10 is determined to be 0.95, and a ratio of an image height of the zoom lens 10 to the effective focal length at the telephoto end of the zoom lens 10 is determined to be 0.093. When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1806, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.093.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 7A to Table 7D.

TABLE 7A

W
M1
M2
T

Focal length (mm)
9.301
13.001
15.042
26.804

F-number
2.567
2.605
2.585
3.541

Image height IMH (mm)
2.250
2.250
2.250
2.250

Half FOV (°)
13.820
9.653
8.375
4.651

BFL (mm)
3.375
3.484
3.296
1.310

TTL (mm)
25.500
25.500
25.500
25.500

Designed wavelength
650 nm, 610 nm, 555 nm, 510 nm, and 470 nm

Table 7A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 7A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 7B

R
Thickness
nd
vd

R1
8.507
d1
1.901
n1
1.55
v1
69.5

R2
−14.892
a1
0.070

R3
−93.156
d2
0.385
n2
1.70
v2
25.7

R4
−61.873
a2
0.070

R5
−59.650
d3
0.381
n3
1.83
v3
25.2

R6
24.736
a3
0.795

R7
47.871
d4
0.675
n4
1.95
v4
17.9

R8
−27.394
a4
0.478

R9
−6.694
d5
0.360
n5
1.69
v5
41.5

R10
3.432
a5
0.185

R11
3.540
d6
0.572
n6
1.95
v6
17.9

R12
4.423
a6
5.106

R13
3.377
d7
2.000
n7
1.55
v7
69.9

R14
−8.634
a7
0.678

R15
231.226
d8
2.000
n8
1.85
v8
20.0

R16
11.930
a8
1.754

R17
−3.167
d9
0.363
n9
1.94
v9
19.3

R18
126.912
a9
0.236

R19
6.078
d10
1.819
n10
1.74
v10
27.9

R20
−74.921
a10
0.562

R21
−284.824
d11
0.539
n11
1.56
v11
67.8

R22
6.024
a11
0.130

R23
6.834
d12
1.065
n12
1.91
v12
35.3

R24
−6.610
a12
2.565

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 7B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 7C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.33E−04
−1.70E−05
4.21E−06
−5.62E−07
3.58E−08
−9.39E−10

aspheric

R2
Even
0.00
5.84E−04
−7.22E−06
−1.07E−06
9.91E−08
−2.97E−09
−5.28E−11

aspheric

R3
Even
0.00
4.57E−06
6.60E−07
−1.46E−08
2.55E−10
6.65E−11
7.04E−12

aspheric

R4
Even
0.00
−5.14E−06
−2.66E−07
5.62E−08
2.12E−09
2.04E−11
−9.86E−13

aspheric

R5
Even
0.00
2.91E−05
2.33E−05
4.78E−07
−1.86E−07
9.87E−09
0.00E+00

aspheric

R6
Even
0.00
1.82E−05
1.21E−05
6.19E−06
−9.95E−07
6.43E−08
−1.30E−09

aspheric

R7
Even
0.00
8.19E−05
−2.17E−05
−2.62E−06
−6.87E−08
−2.21E−08
2.82E−10

aspheric

R8
Even
0.00
−4.00E−05
−8.05E−06
−3.28E−06
−5.53E−07
3.99E−09
1.21E−09

aspheric

R9
Even
0.00
4.93E−04
2.60E−04
−4.03E−05
1.96E−06
6.22E−08
−5.62E−09

aspheric

R10
Even
0.00
−2.07E−03
−9.74E−05
−4.94E−05
6.19E−06
−6.76E−07
5.54E−08

aspheric

R11
Even
0.00
−3.78E−03
−3.85E−04
−5.79E−06
2.88E−06
−5.96E−07
−1.54E−08

aspheric

R12
Even
0.00
−4.32E−03
−1.70E−04
6.90E−07
6.91E−07
−5.15E−07
−1.29E−08

aspheric

R13
Even
0.00
−1.91E−03
−9.52E−05
−1.39E−05
−1.15E−07
−1.84E−07
1.71E−08

aspheric

R14
Even
0.00
2.21E−03
−4.98E−05
8.55E−06
−2.36E−06
4.26E−07
−2.34E−08

aspheric

R15
Even
0.00
−9.98E−05
1.75E−04
5.56E−05
−1.48E−06
−1.78E−09
−1.04E−07

aspheric

R16
Even
0.00
1.35E−03
1.22E−03
7.75E−05
7.42E−05
−5.31E−07
−4.88E−08

aspheric

R17
Even
0.00
9.72E−03
−4.21E−04
1.93E−04
−7.75E−05
9.48E−07
−1.43E−08

aspheric

R18
Even
0.00
9.93E−03
−6.86E−04
−1.87E−04
1.92E−05
1.81E−08
1.46E−09

aspheric

R19
Even
0.00
−4.26E−03
−1.58E−04
−5.03E−05
9.00E−06
−5.22E−07
−7.32E−08

aspheric

R20
Even
0.00
−3.92E−03
−1.15E−04
−1.72E−05
6.86E−06
−8.83E−07
3.11E−08

aspheric

R21
Even
0.00
−3.61E−03
5.86E−04
−4.79E−05
3.15E−06
8.11E−08
−1.07E−08

aspheric

R22
Even
−1.68
−1.02E−03
−6.98E−04
2.36E−05
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
−2.61E−04
−7.33E−04
7.50E−05
−8.75E−06
7.64E−07
−2.57E−08

aspheric

R24
Even
0.00
1.60E−03
−7.03E−05
1.11E−05
−4.05E−07
7.45E−10
4.89E−09

aspheric

In Table 7C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 7C that, in Embodiment 7, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 7D

W
M1
M2
T

a3
0.865 mm
2.663 mm
3.206 mm
5.464 mm

a6
5.117 mm
3.319 mm
2.776 mm
0.518 mm

a9
1.773 mm
0.357 mm
0.114 mm
1.188 mm

a12
0.376 mm
1.792 mm
2.035 mm
0.960 mm

Table 7D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 21 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 21 that, in Embodiment 7, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.017 mm to 0.02 mm.

FIG. 35 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 35 that, in Embodiment 7, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 49 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 49 that, in Embodiment 7, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.8%.

Embodiment 8

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.032 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1934, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1824.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 8A to Table 8D.

TABLE 8A

W
M1
M2
T

Focal length
9.300
12.999
15.040
26.796

(mm)

F-number
2.874
2.975
3.013
3.600

Image height
2.500
2.500
2.500
2.500

IMH (mm)

Half FOV (°)
15.487
10.981
9.429
5.205

BFL (mm)
1.328
4.638
5.980
5.307

TTL (mm)
25.500
25.500
25.500
25.500

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 8A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 8A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 8B

R
Thickness
nd
vd

R1
8.025
d1
1.942
n1
1.54
v1
70.7

R2
−14.151
a1
0.070

R3
−92.744
d2
0.428
n2
1.95
v2
17.9

R4
−44.306
a2
0.081

R5
−35.478
d3
0.360
n3
1.86
v3
26.6

R6
21.556
a3
0.631

R7
50.789
d4
0.453
n4
1.95
v4
17.9

R8
−2569.9
a4
0.533

R9
−8.225
d5
0.360
n5
1.72
v5
47.6

R10
3.441
a5
0.070

R11
3.238
d6
0.608
n6
1.95
v6
17.9

R12
4.218
a6
5.431

R13
3.668
d7
1.945
n7
1.55
v7
69.5

R14
−6.020
a7
0.074

R15
−32.787
d8
1.409
n8
1.76
v8
23.2

R16
17.558
a8
0.301

R17
−9.964
d9
0.360
n9
1.63
v9
41.4

R18
−25.485
a9
4.702

R19
6.237
d10
0.888
n10
1.50
v10
81.4

R20
80.682
a10
0.775

R21
33.202
d11
0.745
n11
1.91
v11
35.3

R22
5.299
a11
0.921

R23
7.288
d12
1.082
n12
1.90
v12
18.8

R24
12.590
a12
0.518

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 8B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 8C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
8.80E−05
−1.66E−05
4.16E−06
−5.61E−07
3.49E−08
−9.24E−10

aspheric

R2
Even
0.00
6.14E−04
−6.87E−06
−1.17E−06
9.61E−08
−3.04E−09
−4.01E−11

aspheric

R3
Even
0.00
2.51E−05
−2.13E−07
2.40E−08
1.00E−08
0.00E+00
0.00E+00

aspheric

R4
Even
0.00
−2.41E−05
1.24E−06
1.55E−07
8.27E−09
0.00E+00
0.00E+00

aspheric

R5
Even
0.00
8.13E−06
2.19E−05
4.49E−07
−1.91E−07
1.02E−08
0.00E+00

aspheric

R6
Even
0.00
−5.74E−06
1.05E−05
5.93E−06
−1.01E−06
6.51E−08
−1.33E−09

aspheric

R7
Even
0.00
1.66E−04
−1.04E−05
−2.57E−06
1.14E−06
0.00E+00
0.00E+00

aspheric

R8
Even
0.00
2.47E−04
−3.09E−05
3.91E−07
9.86E−08
0.00E+00
0.00E+00

aspheric

R9
Even
0.00
1.12E−04
1.05E−04
−5.28E−05
2.88E−06
−7.92E−08
1.51E−08

aspheric

R10
Even
0.00
−2.19E−03
−2.79E−04
−8.71E−05
4.62E−06
−2.37E−07
5.54E−08

aspheric

R11
Even
0.00
−4.52E−03
−4.09E−04
−5.91E−06
2.15E−06
9.07E−08
−3.17E−08

aspheric

R12
Even
0.00
−4.54E−03
−1.10E−05
8.13E−06
6.36E−06
−2.24E−07
−3.49E−08

aspheric

R13
Even
0.00
−1.50E−03
−9.31E−05
−1.10E−05
−2.32E−07
−1.79E−07
2.15E−08

aspheric

R14
Even
0.00
2.82E−03
−2.15E−05
1.28E−05
−2.57E−06
3.30E−07
1.12E−08

aspheric

R15
Even
0.00
−3.14E−04
2.14E−04
3.70E−05
−3.64E−06
6.27E−07
−5.93E−08

aspheric

R16
Even
0.00
7.60E−04
4.28E−04
1.94E−04
4.52E−06
5.33E−08
−4.88E−08

aspheric

R17
Even
0.00
1.04E−02
−1.26E−04
2.55E−04
−1.79E−05
8.90E−07
−1.43E−08

aspheric

R18
Even
0.00
1.15E−02
1.20E−04
1.76E−05
−4.56E−06
1.81E−08
1.46E−09

aspheric

R19
Even
0.00
−2.25E−03
3.36E−05
−4.78E−05
3.67E−06
4.01E−07
−4.87E−08

aspheric

R20
Even
0.00
−6.04E−03
5.38E−04
−5.21E−05
−3.09E−06
1.99E−06
−1.44E−07

aspheric

R21
Even
0.00
−2.29E−03
5.17E−04
−4.75E−05
1.28E−06
8.99E−07
−7.68E−08

aspheric

R22
Even
0.06
1.16E−03
1.03E−04
1.49E−06
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
9.30E−04
−1.39E−04
7.71E−05
−7.12E−06
2.55E−07
3.18E−09

aspheric

R24
Even
0.00
−3.82E−04
−3.93E−05
4.32E−05
−1.41E−06
0.00E+00
0.00E+00

aspheric

In Table 8C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 8C that, in Embodiment 8, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 8D

W
M1
M2
T

a3
0.631 mm
2.056 mm
2.659 mm
5.562 mm

a6
5.431 mm
4.007 mm
3.403 mm
0.500 mm

a9
4.702 mm
1.393 mm
0.050 mm
0.723 mm

a12
0.518 mm
3.828 mm
5.170 mm
4.497 mm

Table 8D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 22 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 22 that, in Embodiment 8, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.016 mm to 0.04 mm.

FIG. 36 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 36 that, in Embodiment 8, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 50 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 50 that, in Embodiment 8, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 4.1%.

Embodiment 9

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.78 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1786, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.0698.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 9A to Table 9D.

TABLE 9A

W
M1
M2
T

Focal length
9.299
12.998
15.039
26.794

(mm)

F-number
2.784
2.857
2.885
3.524

Image height
2.500
2.500
2.500
2.500

IMH (mm)

Half FOV (°)
15.083
10.864
9.437
5.286

BFL (mm)
1.679
2.390
2.771
3.460

TTL (mm)
25.500
25.500
25.500
25.500

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 9A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 9A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 9B

R
Thickness
nd
vd

R1
8.025
d1
1.942
n1
1.54
v1
70.7

R2
−14.151
a1
0.070

R3
−92.744
d2
0.428
n2
1.95
v2
17.9

R4
−44.306
a2
0.081

R5
−35.478
d3
0.360
n3
1.86
v3
26.6

R6
21.556
a3
0.631

R7
50.789
d4
0.453
n4
1.95
v4
17.9

R8
−2569.9
a4
0.533

R9
−8.225
d5
0.360
n5
1.72
v5
47.6

R10
3.441
a5
0.070

R11
3.238
d6
0.608
n6
1.95
v6
17.9

R12
4.218
a6
5.431

R13
3.668
d7
1.945
n7
1.55
v7
69.5

R14
−6.020
a7
0.074

R15
−32.787
d8
1.409
n8
1.76
v8
23.2

R16
17.558
a8
0.301

R17
−9.964
d9
0.360
n9
1.63
v9
41.4

R18
−25.485
a9
4.702

R19
6.237
d10
0.888
n10
1.50
v10
81.4

R20
80.682
a10
0.775

R21
33.202
d11
0.745
n11
1.91
v11
35.3

R22
5.299
a11
0.921

R23
7.288
d12
1.082
n12
1.90
v12
18.8

R24
12.590
a12
0.518

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 9B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens.

TABLE 9C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.89E−04
−1.56E−05
4.60E−06
−5.65E−07
3.32E−08
−8.02E−10

aspheric

R2
Even
0.00
6.03E−04
−6.37E−06
−1.11E−06
9.86E−08
−3.36E−09
−6.54E−12

aspheric

R3
Even
0.00
8.54E−05
1.67E−06
8.49E−08
2.03E−08
8.11E−10
1.80E−10

aspheric

R4
Even
0.00
−7.82E−05
−8.96E−08
1.92E−07
2.51E−08
1.59E−09
9.36E−11

aspheric

R5
Even
0.00
−1.37E−04
1.29E−05
5.67E−08
−2.32E−07
9.39E−09
0.00E+00

aspheric

R6
Even
0.00
2.96E−04
2.29E−05
4.92E−06
−1.09E−06
6.62E−08
−1.00E−09

aspheric

R7
Even
0.00
−2.79E−05
3.38E−06
2.08E−06
1.08E−06
−1.98E−08
−9.25E−09

aspheric

R8
Even
0.00
6.72E−04
1.54E−05
6.35E−06
1.59E−06
−1.93E−09
2.40E−08

aspheric

R9
Even
0.00
−4.06E−04
−3.31E−05
−4.17E−05
9.03E−06
−1.01E−07
−1.71E−08

aspheric

R10
Even
0.00
−3.08E−03
−2.79E−04
−7.59E−05
2.38E−06
−5.62E−07
−1.70E−08

aspheric

R11
Even
0.00
−4.54E−03
−3.58E−04
−1.29E−05
1.73E−06
−1.26E−07
−5.92E−08

aspheric

R12
Even
0.00
−4.90E−03
−2.05E−04
1.67E−05
8.78E−06
−1.37E−08
−1.00E−07

aspheric

R13
Even
0.00
−1.11E−03
−2.35E−04
−1.53E−05
8.78E−07
−1.87E−07
−7.12E−09

aspheric

R14
Even
0.00
3.63E−03
1.99E−04
1.94E−05
−3.24E−06
3.32E−07
1.40E−09

aspheric

R15
Even
0.00
−2.90E−04
2.59E−04
5.10E−05
−2.50E−06
6.40E−07
−6.27E−08

aspheric

R16
Even
0.00
4.66E−04
2.85E−04
1.54E−04
−6.56E−06
−3.98E−07
−4.35E−08

aspheric

R17
Even
0.00
1.08E−02
−3.40E−04
2.03E−04
−1.80E−05
−7.12E−08
2.09E−08

aspheric

R18
Even
0.00
7.42E−03
−3.87E−04
4.17E−06
−6.14E−06
6.89E−07
2.98E−08

aspheric

R19
Even
0.00
−3.42E−03
7.00E−05
−3.72E−05
−1.64E−06
1.46E−07
−2.88E−08

aspheric

R20
Even
0.00
−4.91E−03
4.81E−04
−5.74E−05
−3.64E−06
9.51E−07
−5.65E−08

aspheric

R21
Even
0.00
−7.19E−03
5.27E−04
−5.37E−05
−1.19E−05
5.35E−06
−3.22E−07

aspheric

R22
Even
10.08
−2.22E−03
5.76E−06
−1.02E−05
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
−1.80E−02
−3.95E−04
−5.27E−05
−7.51E−05
8.67E−07
−7.27E−07

aspheric

R24
Even
0.00
−1.78E−02
4.10E−04
−1.70E−04
−1.22E−05
1.69E−16
1.39E−18

aspheric

In Table 9C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 9C that, in Embodiment 9, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 9D

W
M1
M2
T

a3
0.500 mm
1.815 mm
2.263 mm
5.055 mm

a6
5.055 mm
3.740 mm
3.292 mm
0.500 mm

a9
1.831 mm
1.121 mm
0.740 mm
0.050 mm

a12
0.869 mm
1.580 mm
1.961 mm
2.650 mm

Table 9D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 23 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 23 that, in Embodiment 9, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.016 mm to 0.03 mm.

FIG. 37 shows lateral chromatic aberration curves of the zoom lens 10 in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state at different wavelengths. It can be seen from FIG. 37 that, in Embodiment 9, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 51 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 51 that, in Embodiment 9, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 0.9%. This significantly reduces the distortion rate of the zoom lens 10.

Embodiment 10

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 9.458 mm.

In this case, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 each have three lenses arranged from the object side to the image side along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 24 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.0676, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.0857.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 10A to Table 10D.

TABLE 10A

W
M1
M2
T

Focal length
9.300
13.000
15.041
26.800

(mm)

F-number
3.016
3.120
3.160
3.731

Image height
2.500
2.500
2.500
2.500

IMH (mm)

Half FOV (°)
15.188
11.090
9.627
5.313

BFL (mm)
0.860
2.475
3.040
3.046

TTL (mm)
25.500
25.500
25.500
25.500

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 10A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 10A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 10B

R
Thickness
nd
vd

R1
6.303
d1
2.343
n1
1.51
v1
79.0

R2
−29.357
a1
0.070

R3
26.813
d2
1.131
n2
1.57
v2
66.3

R4
−28.230
a2
0.070

R5
93.469
d3
0.360
n3
1.95
v3
17.9

R6
35.911
a3
2.225

R7
14.357
d4
0.360
n4
1.88
v4
40.8

R8
3.414
a4
1.712

R9
−7.802
d5
0.360
n5
1.88
v5
40.8

R10
3.501
a5
0.070

R11
3.096
d6
1.442
n6
1.95
v6
17.9

R12
4.176
a6
0.500

R13
3.898
d7
1.740
n7
1.61
v7
61.4

R14
−7.728
a7
0.070

R15
5.180
d8
0.360
n8
1.95
v8
18.0

R16
4.917
a8
0.194

R17
10.043
d9
0.360
n9
1.54
v9
71.3

R18
5.004
a9
0.050

R19
3.238
d10
1.891
n10
1.54
v10
71.3

R20
−42.184
a10
0.897

R21
−19.495
d11
0.360
n11
1.93
v11
25.0

R22
7.883
a11
5.130

R23
−174.163
d12
0.761
n12
1.89
v12
19.0

R24
−12.272
a12
2.236

R25
Infinity
d13
0.210
n13
1.52
v13
64.2

R26
Infinity
a13
0.600

Table 10B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R26 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 10C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
5.91E−05
−2.11E−05
4.59E−06
−5.70E−07
3.30E−08
−8.10E−10

aspheric

R2
Even
0.00
8.24E−04
−5.11E−06
−9.73E−07
1.13E−07
−3.05E−09
−8.30E−11

aspheric

R3
Even
0.00
−6.63E−05
5.03E−06
6.59E−07
4.77E−08
0.00E+00
0.00E+00

aspheric

R4
Even
0.00
−3.36E−05
1.41E−06
3.12E−07
9.57E−10
0.00E+00
0.00E+00

aspheric

R5
Even
0.00
1.14E−04
3.41E−05
1.35E−06
−1.89E−07
8.60E−09
0.00E+00

aspheric

R6
Even
0.00
2.20E−04
3.43E−05
6.89E−06
−9.32E−07
6.91E−08
−1.33E−09

aspheric

R7
Even
0.00
5.20E−04
1.92E−06
−1.51E−05
5.03E−07
0.00E+00
0.00E+00

aspheric

R8
Even
0.00
3.53E−03
5.68E−04
3.41E−05
1.28E−05
0.00E+00
0.00E+00

aspheric

R9
Even
0.00
−4.61E−04
1.09E−04
−9.30E−05
−2.22E−06
−3.69E−06
1.17E−06

aspheric

R10
Even
0.00
−6.12E−03
−1.13E−03
−2.21E−04
1.48E−05
8.89E−06
−1.00E−06

aspheric

R11
Even
0.00
−6.35E−03
−5.79E−04
3.33E−05
5.02E−06
−7.11E−07
−6.95E−08

aspheric

R12
Even
0.00
−7.08E−03
9.42E−04
6.88E−05
−4.74E−06
−2.74E−06
1.70E−07

aspheric

R13
Even
0.00
−2.94E−03
−5.28E−05
8.74E−07
−1.30E−08
−2.59E−07
6.64E−09

aspheric

R14
Even
0.00
2.33E−03
−7.43E−05
6.64E−06
−2.88E−06
2.98E−07
−2.03E−08

aspheric

R15
Even
0.00
−8.91E−04
1.91E−04
3.90E−05
−4.69E−06
4.86E−07
−2.40E−08

aspheric

R16
Even
0.00
1.07E−03
3.08E−04
1.43E−04
−6.07E−06
2.73E−08
−3.77E−08

aspheric

R17
Even
0.00
1.03E−02
−4.02E−04
2.13E−04
−1.75E−05
−8.27E−08
1.41E−07

aspheric

R18
Even
0.00
7.72E−03
−7.11E−05
8.57E−06
−6.88E−06
1.52E−06
1.96E−07

aspheric

R19
Even
0.00
−7.57E−04
7.88E−06
−3.88E−05
6.61E−07
1.50E−07
−1.06E−07

aspheric

R20
Even
0.00
−3.39E−03
2.10E−04
−5.03E−05
−1.73E−06
8.74E−07
−6.44E−08

aspheric

R21
Even
0.00
−5.62E−03
1.04E−03
−4.36E−05
−2.35E−05
8.70E−06
−3.87E−07

aspheric

R22
Even
12.11
6.23E−04
1.10E−03
−9.59E−07
0.00E+00
0.00E+00
0.00E+00

aspheric

R23
Even
0.00
9.93E−04
−2.57E−04
9.31E−05
−1.37E−05
1.23E−06
−4.65E−08

aspheric

R24
Even
0.00
−6.09E−04
−1.05E−04
2.75E−05
−7.33E−07
0.00E+00
0.00E+00

aspheric

In Table 10C, R1 to R24 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 10C that, in Embodiment 10, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 24 aspheric surfaces in total.

TABLE 10D

W
M1
M2
T

a3
0.500 mm
1.069 mm
1.288 mm
2.225 mm

a6
2.225 mm
1.656 mm
1.437 mm
0.500 mm

a9
2.236 mm
0.621 mm
0.056 mm
0.050 mm

a12
0.050 mm
1.665 mm
2.230 mm
2.236 mm

Table 10D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 24 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 24 that, in Embodiment 10, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.016 mm to 0.03 mm.

FIG. 38 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 38 that, in Embodiment 10, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 52 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 52 that, in Embodiment 10, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.6%.

Embodiment 11

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 7.9 mm.

In this case, the first lens group 11 and the second lens group 12 have two lenses arranged along the optical axis, the third lens group 13 has three lenses arranged along the optical axis, and the fourth lens group 14 has one lens arranged along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 14 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

A ratio of a total optical length of the zoom lens 10 to an effective focal length at the telephoto end of the zoom lens 10 is determined to be 1.05, and a ratio of an image height of the zoom lens 10 to the effective focal length at the telephoto end of the zoom lens 10 is determined to be 0.12.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.2123, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1758.

A spacing between the third lens group 13 and a stop of the zoom lens 10 is 0.12 mm.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 11A to Table 11D.

TABLE 11A

W
M1
M2
T

Focal length
9.201
14.001
17.501
21.802

(mm)

F-number
2.488
2.449
2.503
2.849

Image height
2.550
2.550
2.550
2.550

IMH (mm)

Half FOV (°)
15.727
10.254
8.154
6.531

BFL (mm)
6.750
4.268
5.491
8.313

TTL (mm)
23.000
23.000
23.000
23.000

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 11A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 11A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 11B

R
Thickness
nd
vd

R1
7.081
d1
1.557
n1
1.59
v1
67.0

R2
−46.243
a1
0.060

R3
32.607
d2
0.400
n2
1.82
v2
24.1

R4
12.061
a2
0.500

R5
−40.559
d3
0.350
n3
1.54
v3
56.0

R6
6.719
a3
0.755

R7
7.062
d4
0.361
n4
1.54
v4
56.0

R8
2.525
a4
0.067

R9
2.664
d5
0.605
n5
1.67
v5
19.2

R10
3.453
a5
5.383

Stop
Infinity

0.120

R11
3.728
d6
1.672
n6
1.54
v6
56.0

R12
−5.882
a6
0.254

R13
−4.986
d7
1.400
n7
1.67
v7
19.2

R14
−12.135
a7
2.262

R15
4.091
d8
0.504
n8
1.54
v8
56.0

R16
3.283
a8
3.722

R17
Infinity
d9
0.210
n9
1.54
v9
64.2

R18
Infinity
a9
2.818

Table 11B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R18 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient. It should be noted that, in this embodiment, the stop is disposed near a mirror surface of the third lens group facing the object side, and is 0.12 mm away from a mirror surface of the third lens group facing the object side.

TABLE 11C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
−9.28E−05
−5.17E−06
−3.01E−07
5.25E−08
−2.70E−09
0.00E+00

aspheric

R2
Even
0.00
1.68E−04
−1.19E−05
9.90E−07
−4.18E−08
0.00E+00
0.00E+00

aspheric

R5
Even
0.00
1.99E−02
−1.94E−03
2.10E−04
−2.12E−05
5.30E−07
0.00E+00

aspheric

R6
Even
0.00
1.40E−02
1.82E−03
−3.49E−04
7.88E−05
−2.30E−06
0.00E+00

aspheric

R7
Even
0.00
−3.04E−02
4.01E−03
−1.44E−05
−1.97E−05
−6.64E−07
0.00E+00

aspheric

R8
Even
0.00
−2.05E−02
−2.28E−03
4.37E−04
9.94E−06
−1.52E−05
0.00E+00

aspheric

R9
Even
0.00
−2.06E−02
−2.02E−04
1.37E−05
−3.31E−05
3.26E−06
0.00E+00

aspheric

R10
Even
0.00
−3.11E−02
5.01E−03
−6.70E−04
−1.74E−05
1.03E−05
0.00E+00

aspheric

R11
Even
0.00
−4.57E−04
7.96E−06
−1.90E−05
5.62E−06
−8.42E−07
0.00E+00

aspheric

R12
Even
0.00
4.93E−03
1.17E−04
−4.31E−06
−3.89E−06
2.21E−07
0.00E+00

aspheric

R13
Even
0.00
7.89E−03
4.24E−04
−8.46E−05
7.98E−06
0.00E+00
0.00E+00

aspheric

R14
Even
0.00
6.62E−03
6.57E−04
−8.10E−05
2.02E−05
0.00E+00
0.00E+00

aspheric

R15
Even
0.00
−6.35E−03
−8.47E−05
−1.66E−05
1.64E−06
1.70E−12
0.00E+00

aspheric

R16
Even
0.00
−8.35E−03
−2.10E−04
−2.25E−05
7.32E−07
−1.78E−12
0.00E+00

aspheric

In Table 11C, R1 to R16 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 11C that, in Embodiment 11, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 14 aspheric surfaces in total.

TABLE 11D

W
M1
M2
T

a3
0.500 mm
3.112 mm
4.258 mm
5.383 mm

a6
5.383 mm
2.770 mm
1.624 mm
0.500 mm

a9
2.262 mm
4.744 mm
3.521 mm
0.700 mm

a12
3.722 mm
1.241 mm
2.463 mm
5.285 mm

Table 11D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 25 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 25 that, in Embodiment 11, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.016 mm to 0.03 mm.

FIG. 39 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 39 that, in Embodiment 11, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 53 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 53 that, in Embodiment 11, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.8%.

Embodiment 12

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.032 mm.

In this case, the first lens group 11, the second lens group 12, and the third lens group 13 each have three lenses arranged along the optical axis, and the fourth lens group 14 has one lens arranged along the optical axis. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 16 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1845, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1812.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 12A to Table 12D.

TABLE 12A

W
M1
M2
T

Focal length
9.300
13.000
15.041
26.800

(mm)

F-number
2.843
2.903
2.918
3.497

Image height
2.500
2.500
2.500
2.500

IMH (mm)

Half FOV (°)
15.490
10.806
9.298
5.035

BFL (mm)
7.260
7.460
7.260
2.840

TTL (mm)
25.498
25.499
25.498
25.499

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 12A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 12A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 12B

R
Thickness
nd
vd

R1
9.216
d1
1.813
n1
1.55
v1
68.7

R2
−13.719
a1
0.070

R3
−65.353
d2
0.360
n2
1.95
v2
17.9

R4
−59.303
a2
0.070

R5
−57.291
d3
0.370
n3
1.81
v3
20.9

R6
39.825
a3
0.669

R7
−203.495
d4
0.518
n4
1.95
v4
17.9

R8
−43.590
a4
0.409

R9
−7.965
d5
0.360
n5
1.69
v5
54.5

R10
3.508
a5
0.140

R11
3.497
d6
0.581
n6
1.95
v6
17.9

R12
4.464
a6
5.205

R13
3.504
d7
1.504
n7
1.55
v7
69.8

R14
−7.950
a7
0.727

R15
−56.432
d8
1.488
n8
1.74
v8
23.5

R16
4.298
a8
1.162

R17
−4.708
d9
0.607
n9
1.81
v9
20.9

R18
−4.436
a9
0.347

R19
19.759
d10
1.838
n10
1.63
v10
52.2

R20
−11.971
a10
6.450

R21
Infinity
d11
0.210
n11
1.52
v11
64.2

R22
Infinity
a11
0.600

Table 12B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R22 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 12C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.44E−04
−1.66E−05
4.21E−06
−5.66E−07
3.58E−08
−9.38E−10

aspheric

R2
Even
0.00
5.67E−04
−6.21E−06
−1.04E−06
1.01E−07
−2.94E−09
−6.06E−11

aspheric

R5
Even
0.00
2.86E−05
2.25E−05
5.95E−07
−1.81E−07
9.96E−09
0.00E+00

aspheric

R6
Even
0.00
9.18E−06
1.31E−05
5.98E−06
−9.93E−07
6.51E−08
−1.33E−09

aspheric

R9
Even
0.00
1.36E−04
2.22E−04
−4.24E−05
3.43E−06
8.43E−08
−1.89E−08

aspheric

R10
Even
0.00
−1.70E−03
−7.20E−05
−5.70E−05
7.01E−06
−5.85E−07
5.50E−08

aspheric

R11
Even
0.00
−3.54E−03
−3.83E−04
−1.32E−05
1.36E−06
−7.70E−07
−3.28E−08

aspheric

R12
Even
0.00
−4.15E−03
−1.76E−04
8.66E−07
−2.68E−06
−5.20E−07
−3.53E−08

aspheric

R13
Even
0.00
−1.82E−03
−6.40E−05
−5.33E−06
5.43E−07
−1.65E−07
1.59E−08

aspheric

R14
Even
0.00
2.30E−03
−3.47E−05
9.56E−06
−2.34E−06
4.27E−07
−2.70E−08

aspheric

R15
Even
0.00
−5.72E−04
3.99E−05
1.82E−05
−3.54E−06
5.97E−07
−1.06E−07

aspheric

R16
Even
0.00
3.75E−03
4.42E−04
1.43E−04
−1.18E−05
−2.32E−07
−4.88E−08

aspheric

R17
Even
0.00
1.26E−02
9.58E−05
1.16E−04
−4.64E−05
9.75E−07
7.46E−18

aspheric

R18
Even
0.00
8.82E−03
1.04E−04
6.37E−05
−2.84E−05
−7.21E−16
−1.26E−17

aspheric

R19
Even
0.00
−3.40E−03
−1.57E−04
−4.19E−05
4.64E−06
−3.40E−07
−4.79E−08

aspheric

R20
Even
0.00
−4.17E−03
−6.96E−06
−3.41E−05
6.01E−06
−6.98E−07
2.38E−08

aspheric

In Table 12C, R1 to R20 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 12C that, in Embodiment 12, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 16 aspheric surfaces in total.

TABLE 12D

W
M1
M2
T

a3
0.669 mm
2.344 mm
3.058 mm
5.374 mm

a6
5.205 mm
3.529 mm
2.815 mm
0.500 mm

a9
0.347 mm
0.148 mm
0.347 mm
4.768 mm

a12
6.450 mm
6.650 mm
6.450 mm
2.030 mm

Table 12D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 26 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 26 that, in Embodiment 12, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.017 mm to 0.04 mm.

FIG. 40 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 40 that, in Embodiment 12, lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at different wavelengths can be controlled around a lateral diffraction limit range.

FIG. 54 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 54 that, in Embodiment 12, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 1.8%.

Embodiment 13

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8 mm.

In this case, the first lens group 11 and the third lens group 13 each have two lenses arranged from the object side to the image side along the optical axis, the second lens group 12 has three lenses arranged, and the fourth lens group 14 has one lens arranged. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 14 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

A ratio of a total optical length of the zoom lens 10 to an effective focal length at the telephoto end of the zoom lens 10 is determined to be 1.182, and a ratio of an image height of the zoom lens 10 to the effective focal length at the telephoto end of the zoom lens 10 is determined to be 0.186.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1687, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.1971.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 13A to Table 13D.

TABLE 13A

W
M1
M2
T

Focal length
11.000
14.000
18.000
22.000

(mm)

F-number
3.201
3.188
3.136
3.199

Image height
4.100
4.100
4.100
4.100

IMH (mm)

Half FOV (°)
20.726
16.327
12.720
10.331

BFL (mm)
10.241
6.913
5.117
8.355

TTL (mm)
26.000
26.000
26.000
26.000

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 13A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 13A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 13B

R
Thickness
nd
vd

R1
7.971
d1
1.727
n1
1.59
v1
67.0

R2
−50.037
a1
0.134

R3
−91.490
d2
0.403
n2
1.82
v2
24.1

R4
31.999
a2
0.516

R5
−11.427
d3
0.420
n3
1.54
v3
56.0

R6
9.057
a3
1.243

R7
9.845
d4
0.329
n4
1.54
v4
56.0

R8
3.403
a4
0.114

R9
3.753
d5
0.645
n5
1.67
v5
19.2

R10
5.472
a5
5.127

R11
4.470
d6
1.631
n6
1.54
v6
56.0

R12
−6.069
a6
0.408

R13
−5.357
d7
1.400
n7
1.67
v7
19.2

R14
−13.730
a7
0.688

R15
5.897
d8
0.974
n8
1.54
v8
56.0

R16
4.701
a8
9.269

R17
Infinity
d9
0.252
n9
1.52
v9
64.2

R18
Infinity
a9
0.720

Table 13B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R16 indicate surfaces from the object side to the image side of each lens.

TABLE 13C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.88E−05
−8.09E−07
−6.13E−08
4.03E−09
2.06E−11
1.88E−05

aspheric

R2
Even
0.00
1.38E−04
−5.90E−06
2.61E−07
−3.68E−09
0.00E+00
1.38E−04

aspheric

R5
Even
0.00
1.17E−02
−8.91E−04
6.42E−05
−3.05E−06
1.29E−07
1.17E−02

aspheric

R6
Even
0.00
5.74E−03
6.03E−04
−1.37E−04
1.44E−05
−3.91E−07
5.74E−03

aspheric

R7
Even
0.00
−2.25E−02
1.35E−03
−2.17E−05
−2.11E−06
−3.87E−07
−2.25E−02

aspheric

R8
Even
0.00
−1.23E−02
−9.25E−04
1.25E−04
−3.10E−06
−1.67E−07
−1.23E−02

aspheric

R9
Even
0.00
−1.20E−02
5.84E−06
−1.37E−05
−5.93E−06
7.74E−07
−1.20E−02

aspheric

R10
Even
0.00
−1.83E−02
1.91E−03
−1.55E−04
−2.50E−06
6.51E−07
−1.83E−02

aspheric

R11
Even
0.00
−1.11E−04
−3.82E−05
−4.44E−06
5.38E−07
−9.53E−08
−1.11E−04

aspheric

R12
Even
0.00
2.85E−03
4.26E−05
−8.90E−07
−3.03E−07
−3.38E−09
2.85E−03

aspheric

R13
Even
0.00
5.68E−03
2.38E−04
−2.22E−05
1.47E−06
0.00E+00
5.68E−03

aspheric

R14
Even
0.00
5.13E−03
3.23E−04
−1.23E−05
3.07E−06
0.00E+00
5.13E−03

aspheric

R15
Even
0.00
−1.57E−03
−2.00E−05
3.12E−06
−2.94E−07
9.40E−09
−1.57E−03

aspheric

R16
Even
0.00
−2.19E−03
−5.20E−05
5.36E−06
−5.52E−07
1.64E−08
−2.19E−03

aspheric

In Table 13C, R1 to R16 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 13C that, in Embodiment 13, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 14 aspheric surfaces in total.

TABLE 13D

W
M1
M2
T

a2
0.516 mm
2.214 mm
3.888 mm
4.903 mm

a5
5.127 mm
3.430 mm
1.756 mm
0.741 mm

a7
0.688 mm
4.016 mm
5.812 mm
2.575 mm

a8
9.269 mm
5.941 mm
4.145 mm
7.383 mm

Table 13D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 27 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 27 that, in Embodiment 13, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.015 mm to 0.025 mm.

FIG. 41 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 41 that, in Embodiment 13, for lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at the wide-angle end and the telephoto end at different wavelengths, a light ray with a wavelength of 650 nm and a light ray with a wavelength of 470 nm exceeds lateral diffraction limits.

FIG. 55 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 55 that, in Embodiment 13, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 3.8%.

Embodiment 14

The maximum clear aperture diameter of the zoom lens 10, namely, a maximum diameter of a lens in the zoom lens 10, is determined to be 8.4 mm.

In this case, the first lens group 11, the second lens group 12, and the fourth lens group 14 each have two lenses arranged from the object side to the image side along the optical axis, and the third lens group 13 has three lenses arranged. The first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 include 16 aspheric surfaces in total. A lens facing the object side in the first lens group 11 is a biconvex lens with positive refractive power.

A ratio of a total optical length of the zoom lens 10 to an effective focal length at the telephoto end of the zoom lens 10 is determined to be 1.21, and a ratio of an image height of the zoom lens 10 to the effective focal length at the telephoto end of the zoom lens 10 is determined to be 0.16.

When the zoom lens 10 changes from the wide-angle end to the telephoto end, a ratio of a movement distance of the second lens group 12 along the optical axis to the total optical length of the zoom lens is determined to be 0.1645, and a ratio of a movement distance of the fourth lens group 14 along the optical axis to the total optical length of the zoom lens is determined to be 0.0477.

After the foregoing parameters are used, technical effect that can be achieved by the zoom lens 10 is shown in Table 14A to Table 14D.

TABLE 14A

W
M1
M2
T

Focal length
11.000
14.000
17.999
22.000

(mm)

F-number
3.097
3.139
3.146
3.087

Image height
3.500
3.500
3.500
3.500

IMH (mm)

Half FOV (°)
18.044
13.901
10.695
8.693

BFL (mm)
6.629
7.449
7.966
7.901

TTL (mm)
26.653
26.653
26.653
26.653

Designed
650 nm, 610 nm, 555 nm,

wavelength
510 nm, and 470 nm

Table 14A indicates basic optical parameters of the zoom lens 10 at the wide-angle end, the first intermediate focal length, the second intermediate focal length, and the telephoto end. It can be seen from Table 14A that when the image height and TTL remain unchanged, both the focal length and the F-number increase. The zoom lens 10 shows a typical feature of implementing a focal length change from zoom from the wide-angle end to the telephoto end.

TABLE 14B

R
Thickness
nd
vd

R1
13.091
d1
1.456
n1
1.50
v1
80.1

R2
−16.156
a1
0.196

R3
506.663
d2
0.360
n2
1.92
v2
18.9

R4
50.304
a2
2.855

R5
−7.705
d3
0.360
n3
1.54
v3
56.0

R6
3.822
a3
0.074

R7
3.811
d4
0.697
n4
1.67
v4
19.2

R8
5.626
a4
3.322

R9
4.656
d5
1.334
n5
1.54
v5
56.0

R10
−12.005
a5
0.127

R11
5.824
d6
0.775
n6
1.54
v6
56.0

R12
6.760
a6
0.462

R13
−254.810
d7
0.666
n7
1.66
v7
20.4

R14
5.790
a7
1.031

R15
4.516
d8
1.253
n8
1.54
v8
56.0

R16
4.176
a8
2.708

R17
12.164
d9
1.527
n9
1.75
v9
43.2

R18
−50.935
a9
6.477

R19
Infinity
d10
0.252
n10
1.52
v10
64.2

R20
Infinity
a10
0.720

Table 14B indicates a curvature, a thickness, a refractive index, and an abbe coefficient of each lens from the object side to the image side when the zoom lens 10 is at the wide-angle end. R1 to R16 indicate surfaces from the object side to the image side of each lens, R indicates a curvature, Thickness indicates a thickness, nd indicates a refractive index, and vd indicates an abbe coefficient.

TABLE 14C

Aspheric coefficient

Type
K
A2
A3
A4
A5
A6
A7

R1
Even
0.00
1.41E−05
−2.57E−06
8.51E−07
−9.90E−08
5.13E−09
−9.84E−11

aspheric

R2
Even
0.00
1.96E−04
3.51E−06
−4.36E−07
1.58E−08
1.47E−10
−1.47E−11

aspheric

R5
Even
0.00
4.95E−04
5.55E−05
−6.36E−06
5.03E−07
−1.00E−08
−8.15E−10

aspheric

R6
Even
0.00
−1.68E−03
−1.58E−04
−8.90E−06
3.13E−07
6.61E−08
1.15E−08

aspheric

R7
Even
0.00
−2.36E−03
−1.75E−04
−1.44E−05
−4.78E−08
−8.32E−08
5.29E−09

aspheric

R8
Even
0.00
−1.90E−03
1.10E−05
−1.41E−05
−2.29E−08
−1.20E−07
−5.45E−09

aspheric

R9
Even
0.00
−7.76E−04
3.73E−05
6.73E−09
−9.85E−08
−7.19E−09
2.53E−10

aspheric

R10
Even
0.00
1.43E−03
−2.65E−05
2.44E−06
−2.06E−07
−1.17E−09
−3.68E−10

aspheric

R11
Even
0.00
1.70E−04
−5.32E−05
−3.68E−06
−3.12E−07
1.33E−07
−1.19E−08

aspheric

R12
Even
0.00
−9.64E−04
−6.74E−05
−2.87E−06
7.08E−07
1.81E−07
−2.11E−08

aspheric

R13
Even
0.00
2.25E−03
−3.08E−04
2.40E−05
−1.19E−06
1.55E−07
−1.86E−08

aspheric

R14
Even
0.00
3.83E−03
−1.54E−04
3.31E−05
−1.98E−06
1.36E−07
−5.59E−18

aspheric

R15
Even
0.00
−1.67E−03
−3.05E−05
1.19E−05
−2.20E−06
6.19E−08
3.12E−09

aspheric

R16
Even
0.00
−1.79E−03
2.06E−05
1.17E−05
−7.47E−07
−2.23E−07
1.51E−08

aspheric

R17
Even
0.00
−3.68E−04
2.22E−05
1.77E−06
5.09E−07
−1.70E−08
0.00E+00

aspheric

R18
Even
0.00
−2.00E−04
−2.77E−08
3.58E−06
3.20E−08
1.79E−08
0.00E+00

aspheric

In Table 14C, R1 to R18 indicate mirrors that are aspheric surfaces, K is a conic constant, and A2, A3, A4, A5, A6, and A7 are aspheric coefficients respectively. It can be seen from Table 14C that, in Embodiment 14, the first lens group 11, the second lens group 12, the third lens group 13, and the fourth lens group 14 of the zoom lens 10 include 16 aspheric surfaces in total.

TABLE 14D

W
M1
M2
T

a2
1.293 mm
2.855 mm
4.401 mm
5.677 mm

a4
4.884 mm
3.322 mm
1.775 mm
0.500 mm

a6
1.851 mm
1.031 mm
0.514 mm
0.579 mm

a7
5.657 mm
6.477 mm
6.994 mm
6.929 mm

Table 14D indicates spacings between the first lens group 11 to the fourth lens group 14 when the zoom lens 10 is in the wide-angle state, the first intermediate focal length state, the second intermediate focal length state, and the telephoto state.

FIG. 28 shows axial chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 28 that, in Embodiment 14, an axial chromatic aberration of the zoom lens 10 using the foregoing technical parameters can be controlled within a small change range from 0.015 mm to 0.025 mm.

FIG. 42 shows lateral chromatic aberration curves of the zoom lens 10 at the wide-angle end at different wavelengths. It can be seen from FIG. 42 that, in Embodiment 2, for lateral chromatic aberrations of the zoom lens 10 using the foregoing technical parameters at the wide-angle end and the telephoto end at different wavelengths, a light ray with a wavelength of 650 nm and a light ray with a wavelength of 470 nm exceeds lateral diffraction limits.

FIG. 56 shows distortion curves of the zoom lens 10 at the wide-angle end at different wavelengths. The distortion curve indicates a deviation between imaging deformation and an ideal shape. It can be seen from FIG. 56 that, in Embodiment 2, a distortion rate of the zoom lens 10 using the foregoing technical parameters can be effectively controlled below 3.8%.

The foregoing descriptions are embodiments of this application, and are not intended to limit this application. Any modification, equivalent replacement, or improvement made without departing from the principle of this application should fall within the protection scope of this application.

	Number	Date	Country
Parent	PCT/CN2021/080554	Mar 2021	US
Child	17948335		US

Zoom Lens, Camera Module, and Terminal Device

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