Patent Application
20230350161
This application relates to an optical imaging system configured to fold an optical path.
A small-sized camera may be mounted in a wireless terminal device. For example, small-sized cameras may be mounted on a front surface and a rear surface of a wireless terminal device, respectively. Since small-sized cameras are used for various purposes such as outdoor scenery pictures, indoor portrait pictures, and the like, they are required to have performance comparable to that of ordinary cameras. However, it may be difficult for a small-sized camera to implement high performance because a mounting space of the small-sized camera is restricted by a size of a wireless terminal device. Accordingly, there is a need for development of an optical imaging system which may improve performance of a small-sized camera without increasing a size of the small-sized camera.
This Summary is provided to introduce a selection of concepts in simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
An optical imaging system which may be mounted in a thinned small-sized terminal device while having a large focal length.
In one general aspect, an optical imaging system includes a first lens, a second lens, a third lens having positive refractive power, a fourth lens, and a fifth lens disposed in order from an object side. In the optical imaging system, 0.2<(D23+D34+D45)/BFL<0.95 and 0.8<TTL/f<0.95, where D23 is a distance from an image-side surface of the second lens to an object-side surface of the third lens, D34 is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens, D45 is a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens, BFL is a distance from an image-side surface of the fifth lens to an imaging plane, TTL is a distance from an object-side surface of the first lens to the imaging plane, and f is a focal length of the optical imaging system.
The second lens may have negative refractive power.
A sum of a refractive index of the second lens and a refractive index of the third lens may be greater than 3.20.
An absolute value of a sum of a focal length of the first lens and a focal length of the second lens may be less than 2.0.
The optical imaging system may satisfy |f/f1+f/f2|<1.2, where f1 is a focal length of the first lens and f2 is a focal length of the second lens.
The optical imaging system may satisfy 0≤D12/f≤0.07, where D12 is a distance from an image-side surface of the first lens to an object-side surface of the second lens.
The optical imaging system may satisfy 0.62≤EL1S1/ImgHT≤0.94, where EL1S1 is an effective radius of the object-side surface of the first lens and ImgHT is a height of the imaging plane.
The optical imaging system may satisfy 0.8≤EL1S2/EL1S1≤1.01, where EL1S1 is an effective radius of the object-side surface of the first lens and EL1S2 is an effective radius of an image-side surface of the first lens.
The optical imaging system may satisfy 3.5≤TTL/ImgHT, where ImgHT is a height of the imaging plane.
The optical imaging system may satisfy R1/f<0.265, where R1 is a radius of curvature of the object-side surface of the first lens.
An optical imaging system includes a first lens having refractive power, a second lens having refractive power, a third lens having refractive power, a fourth lens having refractive power, and a fifth lens having positive refractive power. In the optical imaging system, a thickness T1 in a center of an optical axis of the first lens and a distance TTL from an object-side surface of the first lens to an imaging plane satisfy 0.08<T1/TTL<0.18.
An image-side surface of the third lens may be concave.
An object-side surface of the fourth lens may be convex.
An image-side surface of the fourth lens may be concave.
An object-side surface of the fifth lens may be convex.
The optical imaging system may satisfy 2.4<(V2+V4)/V3, where V2 is an Abbe number of the second lens, V3 is an Abbe number of the third lens, and V4 is an Abbe number of the fourth lens.
Other features and aspects will be apparent from the following detailed description, the drawings, and the claims.
Throughout the drawings and the detailed description, the same reference numerals refer to the same elements. The drawings may not be to scale, and the relative size, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.
The following detailed description is provided to assist the reader in gaining a comprehensive understanding of the methods, apparatuses, and/or systems described herein.
However, various changes, modifications, and equivalents of the methods, apparatuses, and/or systems described herein will be apparent to one of ordinary skill in the art. The sequences of operations described herein are merely examples, and are not limited to those set forth herein, but may be changed as will be apparent to one of ordinary skill in the art, with the exception of operations necessarily occurring in a certain order. Also, descriptions of functions and constructions that would be well known to one of ordinary skill in the art may be omitted for increased clarity and conciseness.
The features described herein may be embodied in different forms, and are not to be construed as being limited to the examples described herein. Rather, the examples described herein have been provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to one of ordinary skill in the art.
Herein, it is noted that use of the term “may” with respect to an example or embodiment, e.g., as to what an example or embodiment may include or implement, means that at least one example or embodiment exists in which such a feature is included or implemented while all examples and embodiments are not limited thereto.
Throughout the specification, when an element, such as a layer, region, or substrate, is described as being “on,” “connected to,” or “coupled to” another element, it may be directly “on,” “connected to,” or “coupled to” the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, there can be no other elements intervening therebetween.
As used herein, the term “and/or” includes any one and any combination of any two or more of the associated listed items.
Although terms such as “first,” “second,” and “third” may be used herein to describe various members, components, regions, layers, or sections, these members, components, regions, layers, or sections are not to be limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or section from another member, component, region, layer, or section. Thus, a first member, component, region, layer, or section referred to in examples described herein may also be referred to as a second member, component, region, layer, or section without departing from the teachings of the examples.
Spatially relative terms such as “above,” “upper,” “below,” and “lower” may be used herein for ease of description to describe one element's relationship to another element as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, an element described as being “above” or “upper” relative to another element will then be “below” or “lower” relative to the other element. Thus, the term “above” encompasses both the above and below orientations depending on the spatial orientation of the device. The device may also be oriented in other ways (for example, rotated 90 degrees or at other orientations), and the spatially relative terms used herein are to be interpreted accordingly.
The terminology used herein is for describing various examples only, and is not to be used to limit the disclosure. The articles “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms “comprises,” “includes,” and “has” specify the presence of stated features, numbers, operations, members, elements, and/or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, members, elements, and/or combinations thereof.
Due to manufacturing techniques and/or tolerances, variations of the shapes illustrated in the drawings may occur. Thus, the examples described herein are not limited to the specific shapes illustrated in the drawings, but include changes in shape that occur during manufacturing.
The features of the examples described herein may be combined in various ways as will be apparent after an understanding of the disclosure of this application. Further, although the examples described herein have a variety of configurations, other configurations are possible as will be apparent after an understanding of the disclosure of this application.
The drawings may not be to scale, and the relative sizes, proportions, and depiction of elements in the drawings may be exaggerated for clarity, illustration, and convenience.
In the examples, a first lens refers to a lens most adjacent to an object (or a subject), and a fifth lens refers to a lens most adjacent to an imaging plane (or an image sensor). In the example embodiments, units of a radius of curvature, a thickness, a TTL, an Img_HT (a height of an imaging plane: half of a diagonal length of an imaging plane), and a focal length are indicated in millimeters (mm). A thickness of a lens, a gap between lenses, and a TTL refer to a distance of a lens in an optical axis. Also, in the descriptions of a shape of a lens, the configuration in which one surface is convex indicates that an optical axis region of the surface is convex, and the configuration in which one surface is concave indicates that an optical axis region of the surface is concave. Thus, even when it is described that one surface of a lens is convex, an edge of the lens may be concave. Similarly, even when it is described that one surface of a lens is concave, an edge of the lens may be convex.
The optical imaging system includes an optical system including a plurality of lenses. For example, the optical system of the optical imaging system may include a plurality of lenses having refractive power. However, the optical imaging system does not only include lenses having refractive power. For example, the optical imaging system may include a prism for refracting incident light and a stop for adjusting the amount of light. The optical imaging system may also include an infrared cut-off filter for blocking infrared rays. The optical imaging system may further include an image sensor (for example, an imaging device) configured to convert an image of a subject incident through the optical system into an electrical signal. The optical imaging system may further include a gap maintaining member for adjusting a distance between lenses.
The plurality of lenses may be formed of a material having a refractive index different from that of air. For example, the plurality of lenses may be formed of a plastic or glass material. At least one of the plurality of lenses may have an aspherical shape. An aspherical surface of the lens may be represented by equation 1 as below.
In equation 1, “c” is an inverse of a radius of a curvature of a respective lens, “k” is a conic constant, “r” is a distance from a certain point on an aspherical surface of the lens to an optical axis, “A to J” are aspheric constants, “Z” (or SAG) is a height from a certain point on an aspherical surface of the lens to an apex of the aspherical surface in an optical axis direction.
The optical imaging system may include five or more lenses. For example, the optical imaging system may include a first lens, a second lens, a third lens, a fourth lens, and a fifth lens disposed in order from an object side.
The first to fifth lenses may be disposed with a gap with respect to adjacent lenses. For example, a certain gap may be formed between an image-side surface of a lens and an object-side surface of an adjacent lens.
The first lens has a certain refractive power. For example, the first lens may have positive refractive power. One surface of the first lens is convex. For example, an object-side surface of the first lens may be convex. The first lens has a certain refractive index. For example, the first lens may have a refractive index less than 1.56. The first lens has a certain focal length. For example, the focal length of the first lens may be determined within a range of 4.0 to 8.0 mm.
The second lens has a certain refractive power. For example, the second lens may have negative refractive power. One surface of the second lens is concave. For example, an object-side surface or an image-side surface of the second lens may be concave. The second lens has a certain refractive index. For example, the refractive index of the second lens may be 1.6 or more to less than 1.8. The second lens has a certain focal length. For example, the focal length of the second lens may be determined within a range of −7.0 to −3.0 mm.
The third lens has a certain refractive power. For example, the third lens may have positive refractive power. One surface of the third lens is convex. For example, an object-side surface or an image-side surface of the third lens may be convex. The third lens has a certain refractive index. For example, the third lens may have a refractive index of 1.65 or more to less than 2.0. In addition, the refractive index of the third lens may be greater than the refractive index of the second lens. The third lens has a certain focal length. For example, the focal length of the third lens may be determined within a range of 4.6 to 20 mm.
The fourth lens has a certain refractive power. For example, the fourth lens may have positive or negative refractive power. One surface of the fourth lens has a concave shape. For example, an object-side surface or an image-side surface of the fourth lens may be concave. The fourth lens has a certain refractive index. For example, the fourth lens may have a refractive index of 1.6 or more to less than 1.8.
The fifth lens has a certain refractive power. For example, the fifth lens may have positive or negative refractive power. One surface of the fifth lens is concave. For example, an object-side surface or an image-side surface of the fifth lens may be concave. The fifth lens has a certain refractive index. For example, the fifth lens may have a refractive index of 1.5 or more to less than 1.6.
The optical imaging system includes a lens formed of plastic. For example, in the optical imaging system, at least one of the five or more lenses constituting a lens group may be formed of a plastic material. The optical imaging system includes an aspherical lens. For example, in the optical imaging system, at least one of the five or more lenses constituting a lens group may include an aspherical lens.
The optical imaging system may include a member configured to fold or refract an optical path. For example, the optical imaging system may include one or more prisms. The one or more prisms may be disposed on an object side of the first lens or an object-side surface of the first lens and an image side of the fifth lens. The one or more prisms may have a refractive index higher than the refractive index of the third lens. For example, the refractive index of the prism may be 1.7 or more.
The optical imaging system includes a filter, a stop, and image sensor. The filter is disposed between a lens, disposed to be closest to an imaging plane, and an image sensor. The filter blocks certain wavelengths from incident light to improve a resolution of the optical imaging system. For example, the filter may block an infrared wavelength of the incident light. An f number of the optical imaging system may be 2.6 or more.
The optical imaging system may satisfy one or more of conditional expressions below.
3.2<n2+n3
|f1+f2|<2.0
|f/f1+f/f2|<1.2
0≤D12/f≤0.07
0.62≤EL1S1/ImgHT≤0.94
0.8≤EL1S2/EL1S1≤1.01
0.8≤TTL/f≤0.95
3.5≤TTL/ImgHT
R1/f≤0.265
0.08<T1/TTL<0.18
In the above conditional expressions, “n2” is the refractive index of the second lens, “n3” is the refractive index of the third lens, “f” is a focal length of the optical imaging system, “f1” is a focal length of the first lens, “f2” is a focal length of the second lens, “D12” is a distance from an image-side surface of the first lens to an object-side surface of the second lens, “EL1S1” is an effective radius of an object-side surface of the first lens, “EL1S2” is an effective radius of the image-side surface of the first lens, “TTL” is a distance from the object-side surface of the first lens to the imaging plane, “ImgHT” is a height of the imaging plane (half of a diagonal length of the imaging plane), “R1” is a radius of curvature of the object-side surface of the first lens, and “T1” is a thickness in a center of an optical axis of the first lens.
The optical imaging system may additionally satisfy at least one of conditional expressions below.
0.4<BFL/f
0.4<BFL/TTL
2.1<BFL/ImgHT
2.1<f/ImgHT
0.3<(D23+D45)/BFL
0.15<D23/BFL
0.15<D45/BFL
0.2<(D23+D34+D45)/BFL<0.5
0.8<(L1S1:L5S2)/BFL<1.2
(n2+n4)/n3<2.0
2.4<(V2+V4)/V3
In the above conditional expressions, “BFL” is a distance from an image-side surface of the fifth lens to the imaging plane, “D23” is a distance from an image-side surface of the second lens to an object-side surface of the third lens, “D34” is a distance from an image-side surface of the third lens to an object-side surface of the fourth lens, “D45” is a distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens, “L1S1:L5S2” is a distance from the object-side surface of the first lens to the image-side surface of the fifth lens, “n4” is a refractive index of the fourth lens, “V2” is an Abbe number of the second lens, “V3” is an Abbe number of the third lens, and “V4” is an Abbe number of the fourth lens.
Hereinafter, optical imaging systems according to various examples will be described.
An optical imaging system according to a first example will be described with reference to
The optical imaging system 100 may include a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, and a fifth lens 150.
The first lens 110 has positive refractive power. In the first lens 110, an object-side surface is convex and an image-side surface is convex. The second lens 120 has negative refractive power. In the second lens 120, an object-side surface is concave and an image-side surface is concave. The third lens 130 has positive refractive power. In the third lens 130, an object-side surface is convex and an image-side surface is concave. The fourth lens 140 has negative refractive power. In the fourth lens 140, an object-side surface is convex and an image-side surface is concave. The fifth lens 150 has positive refractive power. In the fifth lens 150, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 100 may include a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays, or the like, included in incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP may be configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 110 to the fifth lens 150.
The optical imaging system 100 may include an optical path changing mechanism. For example, the optical imaging system 100 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 1 illustrates lens characteristics of the optical imaging system 100, and Table 2 illustrates aspherical values of the optical imaging system 100.
Hereinafter, an optical imaging system according to a second example will be described with reference to
The optical imaging system 200 may include a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, and a fifth lens 250.
The first lens 210 has positive refractive power. In the first lens 210, an object-side surface is convex and an image-side surface is convex. The second lens 220 has negative refractive power. In the second lens 220, an object-side surface is concave and an image-side surface is concave. The third lens 230 has positive refractive power. In the third lens 230, an object-side surface is convex and an image-side surface is concave. The fourth lens 240 has negative refractive power. In the fourth lens 240, an object-side surface is convex and an image-side surface is concave. The fifth lens 250 has positive refractive power. In the fifth lens 250, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 200 may include a filter IF, an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays, or the like, included in incident light. The image sensor P may include a plurality of optical sensors. The above-configured image sensor P may be configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 210 to the fifth lens 250.
The optical imaging system 200 may include an optical path changing mechanism. For example, the optical imaging system 200 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 3 illustrates lens characteristics of the optical imaging system 200, and Table 4 illustrates aspherical values of the optical imaging system 200.
Hereinafter, an optical imaging system according to a third example will be described with reference to
The optical imaging system 300 may include a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, and a fifth lens 350.
The first lens 310 has positive refractive power. In the first lens 310, an object-side surface is convex and an image-side surface is convex. The second lens 320 has negative refractive power. In the second lens 320, an object-side surface is concave and an image-side surface is concave. The third lens 330 has positive refractive power. In the third lens 330, an object-side surface convex and an image-side surface is concave. The fourth lens 340 has negative refractive power. In the fourth lens 340, an object-side surface is convex and an image-side surface is concave. The fifth lens 350 has positive refractive power. In the fifth lens 350, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 300 may include a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP may be configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 310 to the fifth lens 350.
The optical imaging system 300 may include an optical path changing mechanism. For example, the optical imaging system 300 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 5 illustrates lens characteristics of the optical imaging system 300, and Table 6 illustrates aspherical values of the optical imaging system 300.
Hereinafter, an optical imaging system according to the fourth example will be described with reference to
The optical imaging system 400 includes a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, and a fifth lens 450.
The first lens 410 has positive refractive power. In the first lens 410, an object-side surface is convex and an image-side surface is convex. The second lens 420 has negative refractive power. In the second lens 420, an object-side surface is concave and an image-side surface is concave. The third lens 430 has positive refractive power. In the third lens 430, an object-side surface is convex and an image-side surface is concave. The fourth lens 440 has negative refractive power. In the fourth lens 440, an object-side surface is convex and an image-side surface is concave. The fifth lens 450 has negative refractive power. In the fifth lens 450, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 400 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 410 to the fifth lens 450.
The optical imaging system 400 may include an optical path changing mechanism. For example, the optical imaging system 400 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 7 illustrates lens characteristics of the optical imaging system 400, and Table 8 illustrates aspherical values of the optical imaging system 400.
Hereinafter, an optical imaging system according to the fifth example will be described with reference to
The optical imaging system 500 includes a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, and a fifth lens 550.
The first lens 510 has positive refractive power. In the first lens 510, an object-side surface is convex and an image-side surface is convex. The second lens 520 has negative refractive power. In the second lens 520, an object-side surface is concave and an image-side surface is concave. The third lens 530 has positive refractive power. In the third lens 530, an object-side surface is convex and an image-side surface is convex. The fourth lens 540 has positive refractive power. In the fourth lens 540, an object-side surface is concave and an image-side surface is convex. The fifth lens 550 has negative refractive power. In the fifth lens 550, an object-side surface is concave and an image-side surface is convex.
The optical imaging system 500 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 510 to the fifth lens 550.
The optical imaging system 500 may include an optical path changing mechanism. For example, the optical imaging system 500 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 9 illustrates lens characteristics of the optical imaging system 500, and Table 10 illustrates aspherical values of the optical imaging system 500.
Hereinafter, an optical imaging system according to a sixth example will be described with reference to
The optical imaging system 600 includes a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, and a fifth lens 650.
The first lens 610 has positive refractive power. In the first lens 610, an object-side surface is convex and an image-side surface is convex. The second lens 620 has negative refractive power. In the second lens 620, an object-side surface is concave and an image-side surface is concave. The third lens 630 has positive refractive power. In the third lens 630, an object-side surface is convex and an image-side surface is convex. The fourth lens 640 has negative refractive power. In the fourth lens 640, an object-side surface is concave and an image-side surface is concave. The fifth lens 650 has positive refractive power. In the fifth lens 650, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 600 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 610 to the fifth lens 650.
The optical imaging system 600 may include an optical path changing mechanism. For example, the optical imaging system 600 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 11 illustrates lens characteristics of the optical imaging system 600, and Table 12 illustrates aspherical values of the optical imaging system 600.
Hereinafter, an optical imaging system according to a seventh example will be described with reference to
The optical imaging system 700 includes a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, and a fifth lens 750.
The first lens 710 has positive refractive power. In the first lens 710, an object-side surface is convex and an image-side surface is convex. The second lens 720 has negative refractive power. In the second lens 720, an object-side surface is concave and an image-side surface is concave. The third lens 730 has positive refractive power. In the third lens 730, an object-side surface is convex and an image-side surface is concave. The fourth lens 740 has negative refractive power. In the fourth lens 740, an object-side surface is convex and an image-side surface is concave. The fifth lens 750 has positive refractive power. In the fifth lens 750, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 700 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor P is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lenses 710 to the fifth lenses 750.
The optical imaging system 700 may include an optical path changing mechanism. For example, the optical imaging system 700 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 13 illustrates lens characteristics of the optical imaging system 700, and Table 14 illustrates aspherical values of the optical imaging system 700.
Hereinafter, an optical imaging system according to the eighth example will be described with reference to
The optical imaging system 800 includes a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, and a fifth lens 850.
The first lens 810 has positive refractive power. In the first lens 810, an object side convex and an image side convex. The second lens 820 has negative refractive power. In the second lens 820, an object-side surface is concave and an image-side surface is concave. The third lens 830 has positive refractive power. In the third lens 830, an object-side surface is convex and an image-side surface is concave. The fourth lens 840 has negative refractive power. In the fourth lens 840, an object-side surface is convex and an image-side surface is concave. The fifth lens 850 has positive refractive power. In the fifth lens 850, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 800 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 810 to the fifth lens 850.
The optical imaging system 800 may include an optical path changing mechanism. For example, the optical imaging system 800 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 15 illustrates lens characteristics of the optical imaging system 800, and Table 16 illustrates aspherical values of the optical imaging system 800.
Hereinafter, an optical imaging system according to the ninth example will be described with reference to
The optical imaging system 900 includes a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, and a fifth lens 950.
The first lens 910 has positive refractive power. In the first lens 910, an object-side surface is convex and an image-side surface is convex. The second lens 920 has negative refractive power. In the second lens 920, an object-side is concave and an image-side surface is concave. The third lens 930 has positive refractive power. In the third lens 930, an object-side surface is convex and an image-side surface is concave. The fourth lens 940 has negative refractive power. In the fourth lens 940, an object-side surface is convex and an image-side surface is concave. The fifth lens 950 has positive refractive power. In the fifth lens 950, an object-side surface is convex and an image-side surface is concave.
The optical imaging system 900 includes a filter IF and an image sensor IP. The filter IF may be disposed in front of the image sensor IP to block infrared rays included in the incident light. The image sensor IP may include a plurality of optical sensors. The above-configured image sensor IP is configured to convert an optical signal into an electrical signal. The image sensor IP may form an imaging plane for imaging light incident through the first lens 910 to the fifth lens 950.
The optical imaging system 900 may include an optical path converting mechanism. For example, the optical imaging system 900 may include a prism reflecting or refracting incident light in a direction intersecting an optical path of the incident light.
Table 17 illustrates lens characteristics of the optical imaging system 900, and Table 18 illustrates aspherical values of the optical imaging system 900.
Table 19 illustrates optical characteristics of the optical imaging systems according to the first to ninth examples.
Table 20 and Table 21 show values of conditional expressions of the optical imaging systems according to the first to ninth examples. As can be seen from Table 20 and Table 21, the optical imaging systems according to the first to ninth examples satisfy all of the above-mentioned conditional expressions.
Hereinafter, modified examples of an optical imaging system will be described with reference to
The above-described optical imaging systems according to the first to ninth examples may be configured in the form illustrated in
Since the former form allows the optical imaging system 100 to be disposed in a width direction of the portable terminal device, a distance TTL from an object-side surface of a first lens to an imaging plane of the first lens may be sufficiently secured. Since the latter form may sufficiently secure a distance BFL from an image-side surface of a fifth lens to an imaging plane of an image sensor, it may be advantageous to implement an optical imaging system having a relatively long BFL.
Next, portable terminal devices, each having an optical imaging system according to an example of the present disclosure, will be described with reference to
The above-described optical imaging systems according to the first to ninth examples and the optical imaging systems configured in the forms illustrated in
As described above, an optical imaging system, which may be mounted in a thinned small-sized terminal device while having a large focal length, may be implemented.
While this disclosure includes specific examples, it will be apparent after an understanding of the disclosure of this application that various changes in forms and details may be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are to be considered in a descriptive sense only, and not for purposes of limitation. Descriptions of features or aspects in each example are to be considered as being applicable to similar features or aspects in other examples. Suitable results may be achieved if the described techniques are performed in a different order, and/or if components in a described system, architecture, device, or circuit are combined in a different manner, and/or replaced or supplemented by other components or their equivalents. Therefore, the scope of the disclosure is defined not by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are to be construed as being included in the disclosure.
| Number | Date | Country | Kind |
|---|---|---|---|
| 10-2020-0053742 | May 2020 | KR | national |
This application is a continuation of U.S. application Ser. No. 16/997,045 filed on Aug. 19, 2020, which claims the benefit under 35 USC 119(a) of Korean Patent Application No. 10-2020-0053742 filed on May 6, 2020 in the Korean Intellectual Property Office, the entire disclosures of which is incorporated herein by reference for all purposes.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16997045 | Aug 2020 | US |
| Child | 18350201 | US |
