Taking lens apparatus

[0001] This application is based on Japanese Patent Application No. 2002-196799 filed on Jul. 5, 2002, the contents of which are hereby incorporated by reference.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] The present invention relates to a taking lens apparatus. More specifically, the present invention relates to a taking lens apparatus (a main component of a digital camera, video camera, or camera incorporated in or externally fitted to a digital video unit, personal computer, mobile computer, cellular phone, personal digital assistant (PDA), or the like) that optically takes in an image of a subject through an optical system and that then outputs it in the form of an electrical signal by means of an image sensor, and in particular to a taking lens apparatus provided with a compact high-zoom-ratio zoom lens system.

[0004] 2. Description of the Prior Art

[0005] In recent years, as personal computers become increasingly wide-spread, digital cameras, which permit easy capturing of images, have been becoming increasingly popular with individual users. Digital cameras are expected to continue becoming more and more popular into the future as an image data input device. The image quality of a digital camera generally depends on the number of pixels on the solid-state image sensor, such as a CCD (charge-coupled device), incorporated therein. Nowadays, digital cameras for general consumers boast of high resolution over one mega pixels, and are closing in on cameras using silver-halide film in image quality. Accordingly, to cope with high resolution of modern image sensors, high optical performance is sought in taking lens systems. On the other hand, in digital cameras for general consumers, zooming, in particular optical zooming with minimal image degradation, is desired.

[0006] However, in taking lens systems, it is difficult to achieve high optical performance and a high zoom ratio simultaneously. In addition, in zoom lens systems for use in digital cameras for general consumers, compactness matters. Various proposals have conventionally been made to meet those conflicting requirements. One such proposal is to divert for a digital camera a zoom lens system originally designed for a lens-shutter camera. Another is, as disclosed in Japanese Patent Application Laid-Open No. H8-248318, disposing a prism between lenses to turn the optical axis and thereby shorten the length of the optical system in the direction of the optical axis of the incident light. This helps make a zoom lens system compact.

[0007] It is however difficult to meet the aforementioned different requirements simultaneously with conventionally known zoom lens systems. For example, in a lens shutter camera using silver-halide film, the exit pupil of the zoom lens system used therein is located close to the image plane. Thus, using this zoom lens system in a digital camera makes it impossible to fully exploit the light-condensing performance of the microlenses provided in front of the solid-state image sensor, resulting in extremely uneven brightness between a central and a peripheral portion of the image formed. With conventionally proposed zoom lens systems for digital cameras, it is not possible to move their exit pupil away from the image plane without making the zoom lens systems as a whole larger. The zoom lens system disclosed in Japanese Patent Application Laid-Open No. H8-248318 is compact in the direction of the optical axis of the incident light, but its plus-lead zoom type requires a large front lens element and a large reflecting member, resulting in unsatisfactory compactness.

SUMMARY OF THE INVENTION

[0008] An object of the present invention is to provide a taking lens apparatus provided with a novel, compact zoom lens system that offers a high zoom ratio and high image quality simultaneously.

[0009] To achieve the above object, according to one aspect of the present invention, a taking lens apparatus is provided with: a zoom lens system that is composed of a plurality of lens units and that achieves zooming by varying the distances between the lens units; and an image sensor that converts the optical image formed by the zoom lens system into an electrical signal. The zoom lens system is provided with, from the object side: a first lens unit having a negative optical power; a second lens unit disposed on the image side of the first lens unit and having a negative optical power; a third lens unit disposed on the image side of the second lens unit and having a positive optical power; a fourth lens unit disposed on the image side of the third lens unit and having a positive optical power; and a fifth lens unit disposed on the image side of the fourth lens unit and having a positive optical power. Here, during zooming, the first lens unit remains stationary relative to the image sensor, and the second and third lens units move.

[0010] According to another aspect of the present invention, a taking lens apparatus is provided with: a zoom lens system that is composed of a plurality of lens units and that achieves zooming by varying the distances between the lens units; and an image sensor that converts the optical image formed by the zoom lens system into an electrical signal. The zoom lens system is provided with, from the object side: a first lens unit having a negative optical power and including a reflective surface that bends the optical path substantially at 90°; a second lens unit disposed on the image side of the first lens unit and having a negative optical power; and a plurality of succeeding lens units disposed on the image side of the second lens unit, the plurality of succeeding lens units including at least two lens units having a positive optical power.

[0011] According to still another aspect of the present invention, a digital camera is provided with a taking lens apparatus as described above.

[0012] According to a further aspect of the present invention, a cellular phone is provided with a taking lens apparatus as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

[0013] This and other objects and features of the present invention will become clear from the following description, taken in conjunction with the preferred embodiments with reference to the accompanying drawings in which:

[0014]
FIG. 1 is a lens construction diagram of a first embodiment (Example 1) of the invention;

[0015]
FIG. 2 is a lens construction diagram of a second embodiment (Example 2) of the invention;

[0016]
FIG. 3 is a lens construction diagram of a third embodiment (Example 3) of the invention;

[0017]
FIG. 4 is a lens construction diagram of a fourth embodiment (Example 4) of the invention;

[0018]
FIG. 5 is a lens construction diagram of a fifth embodiment (Example 5) of the invention;

[0019]
FIG. 6 is a lens construction diagram of a sixth embodiment (Example 6) of the invention;

[0020]
FIG. 7 is a lens construction diagram of a seventh embodiment (Example 7) of the invention;

[0021]
FIGS. 8A to 8I are aberration diagrams of Example 1;

[0022]
FIGS. 9A to 9I are aberration diagrams of Example 2;

[0023]
FIGS. 10A to 10I are aberration diagrams of Example 3;

[0024]
FIGS. 11A to 11I are aberration diagrams of Example 4;

[0025]
FIGS. 12A to 12I are aberration diagrams of Example 5;

[0026]
FIGS. 13A to 13I are aberration diagrams of Example 6;

[0027]
FIGS. 14A to 14I are aberration diagrams of Example 7; and

[0028]
FIG. 15 is a diagram schematically showing an outline of the optical construction of the taking lens apparatus embodying the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0029] Hereinafter, taking lens apparatuses embodying the present invention will be described with reference to the drawings. A taking lens apparatus takes in an image of a subject optically and outputs it in the form of an electrical signal. A taking lens apparatus is used as a main component of a camera (for example, a digital camera, video camera, or camera incorporated in or externally fitted to a digital video unit, personal computer, mobile computer, cellular phone, personal digital assistant (PDA), or the like) that is used to shoot a still or moving picture of a subject. For example as shown in FIG. 15, a taking lens apparatus 10 incorporated in a camera 20 is composed of, from the object (subject) side thereof, a taking lens system TL for forming an optical image of an object, a parallel-surface plate PL acting as an optical low-pass filter or the like, and an image sensor SR for converting the optical image formed by the taking lens system TL into an electrical signal.

[0030] In all the embodiments of the invention described later, a zoom lens system composed of a plurality of lens units is used as the taking lens system TL, and zooming is achieved by moving a plurality of lens units along the optical axis AX in such a way as to vary the distances between them. Used as the image sensor SR is, for example, a solid-state image sensor such as a CCD (charge-coupled device) or a CMOS (complementary metal-oxide semiconductor) sensor composed of a plurality of pixels. The optical image formed by the zoom lens system is converted into an electrical signal by the image sensor SR.

[0031] The optical image to be formed by the zoom lens system passes through the optical low-pass filter (i.e., the parallel-surface plate PL) having a predetermined cutoff frequency characteristic that depends on the pixel pitch of the image sensor SR, and meanwhile the optical image has its spatial frequency characteristic so adjusted as to minimize so-called aliasing noise generated when the optical image is converted into an electrical signal. Used as the optical low-pass filter is a birefringence-type low-pass filter made of quartz or the like having an appropriately aligned crystal axis, a phase-type low-pass filter that achieves the required optical cut-off frequency characteristics by exploiting diffraction, or a low-pass filter of any other type. The signal produced by the image sensor SR is subjected to predetermined digital image processing, image compression processing, and the like as required, and is recorded in a memory (such as a semiconductor memory or an optical disk) as a digital video signal; in some cases, the signal is transferred to another device through a cable or after being converted into an infrared signal.

[0032] In the taking lens apparatus 10 shown in FIG. 15, the taking lens system TL performs reduction-projection from the subject located on the enlargement side (with a longer conjugate distance) to the image sensor SR located on the reduction side (with a shorter conjugate distance). It is, however, also possible to use instead of the image sensor SR a display device (for example, a liquid crystal display device) that displays a two-dimensional image, and use the taking lens system TL as a projection lens system. In this way, it is possible to realize an image projection apparatus that performs enlargement-projection from the image display surface located on the reduction side to a screen surface located on the enlargement side. That is, the zoom lens systems of the embodiments described below can be suitably used not only as a taking lens system TL but also as a projection lens system.

[0033] FIGS. 1 to 7 are lens construction diagrams corresponding to the zoom lens systems used respectively in a first to a seventh embodiment of the invention, each showing the lens arrangement as observed at the wide-angle end W in an optical section. In each lens construction diagram, an arrow mj (j=1, 2, . . . ) schematically indicate the movement of the j-th lens unit Grj during zooming from the wide-angle end W to the telephoto end T. In the first to third and fifth to seventh embodiments (FIGS. 1 to 3 and 5 to 7), the first and fifth lens units Gr1 and Gr5 are stationary, and the second to fourth lens units Gr2 to Gr4 are movable; in the fourth embodiment (FIG. 4), the first lens unit Gr1 is stationary, and the second to fifth lens units Gr2 to Gr5 are movable (in FIG. 4, m6 indicates that the parallel-surface plate PL alone is stationary during zooming). Moreover, in each lens construction diagram, a surface marked as ri (i=1, 2, 3, . . . ) is the i-th surface from the object side, with an asterisk (*) following ri indicating an aspherical surface, and an axial distance marked as di (i=1, 2, 3, . . . ) is the i-th axial distance from the object side, through only those axial distances which vary as zooming is performed, i.e., variable axial distances, are shown here.

[0034] In all the embodiments, the zoom lens system is composed of, from the object side thereof, a first lens unit Gr1 having a negative optical power, a second lens unit Gr2 having a negative optical power, a third lens unit Gr3 having a positive optical power, a fourth lens unit Gr4 having a positive optical power, and a fifth lens unit Gr5 having a positive optical power. The zoom lens system is built as a five-unit zoom lens system that achieves zooming by varying the distances between its constituent lens units. Between the third and fourth lens units Gr3 and Gr4 is disposed an aperture stop ST that moves together with the fourth lens unit Gr4 during zooming. The zoom lens system is used in a camera 20 (for example, a digital camera) provided with an image sensor SR such as a CCD, and therefore has two glass parallel-surface plates PL disposed on the image side thereof. These parallel-surface plates PL correspond to an optical filter such as an optical low-pass filter and to a cover glass plate of the image sensor SR or the like. In all the embodiments, the parallel-surface plates PL and the first lens unit Gr1 are kept stationary during zooming, and, as described above, in the first to third and fifth to seventh embodiments, the fifth lens unit Gr5 is also kept stationary during zooming. Now, the lens construction of each embodiment will be described in more detail.

[0035] First Embodiment (FIG. 1)

[0036] The zoom lens system of a first embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed of a negative meniscus lens element convex to the object side and a rectangular prism PR having a reflective surface for bending the optical axis AX at 90°. The second lens unit Gr2 is composed of a biconcave negative lens element (having aspherical surfaces on both sides) and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a cemented positive lens element produced by cementing together a biconvex positive lens element and a negative meniscus lens element convex to the image side. The fourth lens unit Gr4 is composed of a positive meniscus lens element convex to the object side and a cemented lens element (having an aspherical surface on the image side) produced by cementing together a biconvex positive lens element and a biconcave negative lens element. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0037] Second Embodiment (FIG. 2)

[0038] The zoom lens system of a second embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed of a negative meniscus lens element convex to the object side and a rectangular prism PR having a reflective surface for bending the optical axis AX at 90°. The second lens unit Gr2 is composed of a biconcave negative lens element (having aspherical surfaces on both sides) and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a cemented positive lens element produced by cementing together a biconvex positive lens element and a negative meniscus lens element convex to the image side. The fourth lens unit Gr4 is composed of a positive meniscus lens element convex to the object side and a cemented lens element (having an aspherical surface on the image side) produced by cementing together a biconvex positive lens element and a biconcave negative lens element. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0039] Third Embodiment (FIG. 3)

[0040] The zoom lens system of a third embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed of a negative meniscus lens element convex to the object side and a rectangular prism PR having a reflective surface for bending the optical axis AX at 90°. The second lens unit Gr2 is composed of a biconcave negative lens element (having aspherical surfaces on both sides) and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a cemented positive lens element produced by cementing together a biconvex positive lens element and a negative meniscus lens element convex to the image side. The fourth lens unit Gr4 is composed of a biconvex positive lens element, a cemented lens element produced by cementing together a positive meniscus lens element convex to the image side and a biconcave negative lens element, and a negative meniscus lens element (having an aspherical surface on the object side) concave to the image side. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0041] Fourth Embodiment (FIG. 4)

[0042] The zoom lens system of a fourth embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed of a negative meniscus lens element convex to the object side and a rectangular prism PR having a reflective surface for bending the optical axis AX at 90°. The second lens unit Gr2 is composed of a biconcave negative lens element (having aspherical surfaces on both sides) and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a biconvex positive lens element and a biconcave negative lens element (having an aspherical surface on the image side). The fourth lens unit Gr4 is composed of a cemented lens element produced by cementing together a biconvex positive lens element and a biconcave negative lens element and a cemented lens element produced by cementing together a negative meniscus lens element convex to the object side and a positive meniscus lens element convex to the object side. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0043] Fifth Embodiment (FIG. 5)

[0044] The zoom lens system of a fifth embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed solely of a negative meniscus lens element convex to the object side. The second lens unit Gr2 is composed of a biconcave negative lens element (having aspherical surfaces on both sides) and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a cemented positive lens element produced by cementing together a biconvex positive lens element and a negative meniscus lens element convex to the image side. The fourth lens unit Gr4 is composed of a positive meniscus lens element convex to the object side and a cemented lens element (having an aspherical surface on the image side) produced by cementing together a biconvex positive lens element and a biconcave negative lens element. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0045] Sixth Embodiment (FIG. 6)

[0046] The zoom lens system of a sixth embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed solely of a negative meniscus lens element convex to the object side. The second lens unit Gr2 is composed of a negative meniscus lens element (having aspherical surfaces on both sides) concave to the image side and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a cemented positive lens element produced by cementing together a biconvex positive lens element and a negative meniscus lens element convex to the image side. The fourth lens unit Gr4 is composed of a cemented lens element produced by cementing together a biconvex positive lens element and a biconcave negative lens element, and a positive meniscus lens element (having aspherical surfaces on both sides) convex to the object side. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0047] Seventh Embodiment (FIG. 7)

[0048] The zoom lens system of a seventh embodiment of the invention is a five-unit zoom lens system of a negative-negative-positive-positive-positive type, with each lens unit constructed, from the object side thereof, as follows. The first lens unit Gr1 is composed of a negative meniscus lens element convex to the object side and a rectangular prism PR having a reflective surface for bending the optical axis AX at 90°. The second lens unit Gr2 is composed of a biconcave negative lens element (having aspherical surfaces on both sides) and a positive meniscus lens element convex to the object side. The third lens unit Gr3 is composed of a cemented positive lens element produced by cementing together a biconvex positive lens element and a negative meniscus lens element convex to the image side. The fourth lens unit Gr4 is composed of a positive meniscus lens element convex to the object side and a cemented lens element (having an aspherical surface on the image side) produced by cementing together a biconvex positive lens element and a biconcave negative lens element. The fifth lens unit Gr5 is composed solely of a positive meniscus lens element (having aspherical surfaces on both sides) convex to the image side.

[0049] In all the embodiments, the zoom lens system is characterized in that it is composed of, from the object side thereof, a first lens unit Gr1 having a negative optical power, a second lens unit Gr2 having a negative optical power, a third lens unit Gr3 having a positive optical power, a fourth lens unit Gr4 having a positive optical power, and a fifth lens unit Gr5 having a positive optical power, and in that it achieves zooming by varying the distances between those lens units. Given the first and second lens units Gr1 and Gr2 negative powers makes it easy to realize a retro-focus type so that the rays incident on the image plane are telecentric. This telecentricity toward the image side is a necessary condition in a taking lens system TL for use in a camera (such as a digital camera) provided with an image sensor SR, because it makes it possible to fully exploit the light-condensing performance of the microlenses provided in front of the solid-state image sensor SR. Thus, it is possible to make the zoom lens system as a whole compact and obtain an image with even brightness.

[0050] Moreover, in all the embodiments, the zoom lens system is characterized in that the first lens unit Gr1 remains stationary during zooming and thus zooming is achieved by moving the lens units other than the first lens unit Gr1 in such a way as to vary the distances between the lens units. Keeping the first lens unit Gr1 stationary during zooming makes it possible to achieve compactness while maintaining satisfactory optical performance. In addition, keeping the first lens unit Gr1 stationary makes it possible to achieve inner zooming, leading to reduction of start-up time. Furthermore, keeping the first lens unit Gr1, which has the largest lens diameter, stationary makes it possible to reduce the lens barrel diameter.

[0051] Moreover, in all the embodiments, the zoom lens system is so constructed that the third to fifth lens units Gr3 to Gr5 all have a positive power and that an aperture stop ST is disposed between the third and fourth lens units Gr3 and Gr4. That is, a plurality of lens units are disposed on the image side of the second lens unit Gr2, and they include at least two positive lens units, with an aperture stop ST disposed between those two positive lens unit. This construction is desirable to maintain satisfactory optical performance. Disposing the aperture stop ST behind a positive lens unit helps reduce the aperture stop diameter, and thus helps make the shutter unit compact, and is also effective in correcting distortion.

[0052] In a zoom lens system, like those of the embodiments, that is composed of five, i.e., a negative, a negative, a positive, a positive, and a positive, lens units, it is preferable that a reflective surface be disposed in the first lens unit Gr1, which remains stationary during zooming. In the first to fourth and seventh embodiments, the zoom lens system has a rectangular prism PR, for bending the optical axis AX at 90°, disposed within the first lens unit Gr1; in the fifth and sixth embodiments, the zoom lens system has a space secured within the first lens unit Gr1 to permit placement of a reflecting member (such as a mirror or prism) for bending the optical axis AX at 90°. Disposing a reflective member such as a mirror or prism in the first lens unit Gr1 so as to bend the optical axis AX at 90° makes it possible not only to keep constant and but also to shorten the length of the zoom lens system in the direction of the optical axis of the incident light. This helps reduce the apparent thickness and size of a camera, and thereby realize a camera of which the thickness does not vary with zooming or as a result of the collapsing of a lens barrel. The optical axis AX may be bent at any angle other than 90° as necessary. The reflective surface may be given an optical power. The optical axis AX may be bent by the use of a refractive or diffractive surface instead of the reflective surface.

[0053] In a zoom lens system, like those of the embodiments, that is composed of five, i.e., a negative, a negative, a positive, a positive, and a positive, lens units and in which the first lens unit Gr1, which remains stationary during zooming, includes a reflective surface, it is preferable that condition (1) below be fulfilled.

2<|fl/fW|<6 (1)

[0054] where

[0055] fl represents the focal length of the lens group located on the object side of the reflective surface; and

[0056] fW represents the focal length of the zoom lens system as a whole at the wide-angle end W.

[0057] Condition (1) defines the preferable focal length of the lens group located in front of the reflective surface within the first lens unit Gr1. If the lower limit of condition (1) is transgressed, the lens group located in front of the reflective surface has too short a focal length. This causes extremely large distortion, in particular negative distortion at the wide-angle end, and thus makes it difficult to maintain satisfactory optical performance. By contrast, if the upper limit of condition (1) is transgressed, the lens group located in front of the reflective surface has too long a focal length, and thus the power with which it makes the rays incident on the first lens unit Gr1 converge is too weak. This makes the lens diameter of the first lens unit Gr1 and the reflective member unduly large, which is undesirable for miniaturization.

[0058] In a zoom lens system, like those of the embodiments, that is composed of five, i.e., a negative, a negative, a positive, a positive, and a positive, lens units and in which the first lens unit Gr1 remains stationary during zooming, it is preferable that condition (2) below be fulfilled.

2<|fl2/fW|<5 (2)

[0059] where

[0060] fl2 represents the composite focal length of the first and second lens units at the wide-angle end W; and

[0061] fW represents the focal length of the zoom lens system as a whole at the wide-angle end W.

[0062] Condition (2) defines the preferable range of the composite focal length of the first and second lens units Gr1 and Gr2 at the wide-angle end W. If the upper limit of condition (2) is transgressed, the composite focal length of the first and second lens units Gr1 and Gr2 is too long. This makes the total length of the zoom lens system unduly large. Moreover, transgressing the upper limit of condition (2) reduces the power with which the first and second lens units Gr1 and Gr2 make rays converge. This makes the external diameter of the lenses unduly large, and thus makes it impossible to realize a compact zoom lens system. By contrast, if the lower limit of condition (2) is transgressed, the composite focal length of the first and second lens units Gr1 and Gr2 is too short. This causes the first and second lens units Gr1 and Gr2 to produce extremely large negative distortion at the wide-angle end W, which is difficult to correct.

[0063] It is further preferable that conditional formula (2a) below be fulfilled. Conditional formula (2a) defines a further preferable conditional range within that defined by conditional formula (2) above.

2<|f12/fW|<4 (2a)

[0064] In all the embodiments, the zoom lens system is composed solely of refractive lens elements, which deflect incident light by refraction (i.e. lens elements of the type that deflects light at the interface between two media having different refractive indices). It is possible, however, to replace any of these lens elements with a lens element of any other type, for example, a diffractive lens element, which deflects incident light by diffraction, or a refractive/diffractive hybrid lens element, which deflects incident light by diffraction and refraction combined together, or a gradient index lens element, which deflects incident light with varying refractive indices distributed within a medium. In addition to the aperture stop ST, a beam restricting plate or the like for cutting unnecessary light may be arranged as necessary.

EXAMPLES

[0065] Hereinafter, practical examples of the construction and other features of zoom lens systems for use in taking lens apparatuses embodying the invention will be presented with reference to their construction data and other data. Tables 1 to 7 show the construction data of Examples 1 to 7, respectively. Examples 1 to 7 correspond to the first to seventh embodiments described hereinabove. Thus, the lens construction diagrams (FIGS. 1 to 7) of the first to seventh embodiments also show the lens constructions of Examples 1 to 7, respectively.

[0066] In the construction data of each example, ri (i=1, 2, 3, . . . ) represents the radius of curvature (mm) of the i-th surface from the object side, di (i=1, 2, 3, . . . ) represents the i-th axial distance (mm) from the object side, and Ni (i=1, 2, 3, . . . ) and vi (i=1, 2, 3, . . . ) respectively represent the refractive index (Nd) for the d-line and the Abbe number (vd) of the i-th optical element from the object side. For each of those axial distances which vary during zooming, i.e. variable axial distances, three values are listed, namely, from left, the axial distance observed at the wide-angle end (shortest-focal-length end, W), the axial distance observed at the middle (middle-focal-length point, M), and the axial distance observed at the telephoto end (longest-focal-length end). Shown together with these data are the focal length (f, mm) of the taking lens system as a whole and the f-number (FNO) observed in those three different focal-length conditions W, M, and T. Table 8 shows the values of the conditional formulae as actually observed in Examples 1 to 7.

[0067] A surface of which the radius of curvature ri is marked with an asterisk (*) is an aspherical surface (a refractive optical surface having an aspherical shape, a surface that exerts a refractive effect equivalent to that of an aspherical surface, or the like). The surface shape of such an aspherical surface is defined by formula (AS) below. The aspherical surface data of the aspherical surfaces used in each example are also shown (except when Ai =0) together with the other data mentioned above.

X
(H)=(C0·H2)/(1+{square root}{square root over (1−ε·C02.H2)})+Σ(Ai·Hi) (AS)

[0068] where

[0069] X(H) represents the displacement along the optical axis AX at the height H (relative to the vertex);

[0070] H represents the height in a direction perpendicular to the optical axis AX;

[0071] C0 represents the paraxial curvature (=the reciprocal of the radius of curvature);

[0072] ε represents the quadric surface parameter; and

[0073] Ai represents the aspherical surface coefficient of i-th order.

[0074]
FIGS. 8A to 8I, FIGS. 9A to 9I, 10A to 10I, FIGS. 11A to 11I, 12A to 12I, FIGS. 13A to 13I, and FIGS. 14A to 14I are aberration diagrams of Examples 1 to 7, respectively. Of these aberration diagrams, FIGS. 8A, 8B, 8C, 9A, 9B, 9C, 10A, 10B, 10C, 11A, 11B, 11C, 12A, 12B, 12C, 13A, 13B, 13C, 14A, 14B, and 14C show the aberrations observed at the wide-angle end W, FIGS. 8D, 8E, 8F, 9D, 9E, 9F, 10D, 10E, 10F, 11D, 11E, 11F, 12D, 12E, 12F, 13D, 13E, 13F, 14D, 14E, and 14F show the aberrations observed at the middle M, and FIGS. 8G, 8H, 8I, 9G, 9H, 9I, 10G, 10H, 10I, 11G, 11H, 11I, 12G, 12H, 12I, 13G, 13H, 13I, 14G, 14H, and 14I show the aberrations observed at the telephoto end T. Of these aberration diagrams, FIGS. 8A, 8D, 8G, 9A, 9D, 9G, 10A, 10D, 10G, 11A, 11D, 11G, 12A, 12D, 12G, 13A, 13D, 13G, 14A, 14D, and 14G show spherical aberration and sine condition, FIGS. 8B, 8E, 8H, 9B, 9E, 9H, 10B, 10E, 10H, 11B, 11E, 11H, 12B, 12E, 12H, 13B, 13E, 13H, 14B, 14E, and 14H show astigmatism, and FIGS. 8C, 8F, 8I, 9C, 9F, 9I, 10C, 10F, 10I, 11C, 11F, 11I, 12C, 12F, 12I, 13C, 13F, 13I, 14C, 14F, and 14I show distortion, with Y′ representing the maximum image height (mm). In the spherical aberration diagrams, the solid line (d) and dash-and-dot line (g) represent the spherical aberration (mm) observed for the d- and g-lines, respectively, and the broken line (SC) represents the deviation (mm) from the sine condition to be fulfilled. In the astigmatism diagrams, the broken line (DM) and solid line (DS) represent the astigmatism (mm) observed for the d-line on the meridional and sagittal planes, respectively. In the distortion diagrams, the solid line represents the distortion (%) observed for the d-line.

[0075] As described above, according to the present invention, it is possible to realize a taking lens apparatus provided with a novel, compact zoom lens system that offers a high zoom ratio and high image quality simultaneously. By applying the present invention to a digital camera, video camera, or camera incorporated in or externally fitted to a digital video unit, personal computer, mobile computer, cellular phone, personal digital assistant (PDA), or the like, it is possible to achieve miniaturization, cost reduction, higher zoom ratios, and higher performance in such apparatuses.

1TABLE 1Example 1f = 5.00˜9.50˜15.00FNO = 2.80˜3.70˜4.20Radius ofAxialRefractiveAbbeCurvatureDistanceIndexNumber(Gr1)r1 = 31.701d1 = 0.900N1 = 1.85000ν1 = 40.04r2 = 8.647d2 = 2.088r3 = ∞d3 = 8.500N2 = 1.84666ν2 = 23.82r4 = ∞d4 = 3.233˜1.674˜1.200(Gr2)r5* = −21.782d5 = 1.100N3 = 1.52200ν3 = 52.20r6* = 11.586d6 = 0.900r7 = 14.073d7 = 1.524N4 = 1.80518ν4 = 25.43r8 = 358422.94d8 =13.310˜4.790˜0.700(Gr3)r9 = 43.083d9 = 2.062N5 = 1.63854ν5 = 55.62r10 = −9.180d10 = 0.800N6 = 1.84666ν6 = 23.82r11 = −16.737d11 =2.856˜8.402˜5.980(ST)r12 = ∞d12 = 0.722(Gr4)r13 = 7.459d13 = 1.978N7 = 1.62041ν7 = 60.29r14 = 33.058d14 = 1.044r15 = 11.623d15 = 3.032N8 = 1.75000ν8 = 25.14r16 = −5.814d16 = 0.010N9 = 1.51400ν9 = 42.83r17 = −5.814d17 = 1.357N10 = 1.84506ν10 = 23.66r18* = 5.068d18 =2.371˜6.904˜13.890(Gr5)r19* = −18.602d19 = 2.356N11 = 1.52200ν11 = 52.20r20* = −5.401d20 = 0.600(PL)r21 = ∞d21 = 1.667N12 = 1.51680ν12 = 64.20r22 = ∞d22 = 0.556r23 = ∞d23 = 0.833N13 = 1.51680ν13 = 64.20r24 = ∞Aspherical Surface Data of Surface r5ε = 1.0000, A4 = 0.29414098 × 10−3,A6 = −0.24733506 × 10−4, A8 = 0.87070898 × 10−6,A10 = −0.12827015 × 10−7Aspherical Surface Data of Surface r6ε = 1.0000, A4 = 0.20824187 × 10−3,A6 = −0.22777976 × 10−4, A8 = 0.83844415 × 10−6,A10 = −0.12745727 × 10−7Aspherical Surface Data of Surface r18ε = 1.0000, A4 = 0.62307152 × 10−3,A6 = 0.42691528 × 10−4, A8 = −0.38772774 × 10−5Aspherical Surface Data of Surface r19ε = 1.0000, A4 = −0.36121443 × 10−3,A6 = 0.37845288 × 10−4, A8 = −0.54090483 × 10−5,A10 = 0.38670552 × 10−7Aspherical Surface Data of Surface r20ε = 1.0000, A4 = 0.14658788 × 10−2,A6 = −0.77179378 × 10−5, A8 = −0.14042061 × 10−5

[0076]

2

TABLE 2

Example 2

f = 4.70˜8.93˜18.10

FNO = 2.80˜3.70˜4.70

Radius of
Axial
Refractive
Abbe

Curvature
Distance
Index
Number

(Gr1)

r1 = 29.581
d1 = 0.900
N1 = 1.85000
ν1 = 40.04

r2 = 8.967
d2 = 2.365

r3 = ∞
d3 = 9.700
N2 = 1.84666
ν2 = 23.82

r4 = ∞
d4 = 1.308˜1.500˜1.200

(Gr2)

r5* = −89.908
d5 = 1.100
N3 = 1.52200
ν3 = 52.20

r6* = 9.503
d6 = 0.964

r7 = 11.195
d7 = 1.533
N4 = 1.80518
ν4 = 25.43

r8 = 35.938
d8 =

18.544˜7.394˜0.727

(Gr3)

r9 = 41.873
d9 = 2.051
N5 = 1.67003
ν5 = 47.15

r10 = −9.073
d10 = 0.892
N6 = 1.84666
ν6 = 23.82

r11 = −18.353
d11 =

0.500˜7.808˜3.323

(ST)

r12 = ∞
d12 = 0.722

(Gr4)

r13 = 7.528
d13 = 2.210
N7 = 1.48749
ν7 = 70.44

r14 = 92.758
d14 = 0.100

r15 = 9.446
d15 = 3.641
N8 = 1.75000
ν8 = 25.14

r16 = −5.823
d16 = 0.010
N9 = 1.51400
ν9 = 42.83

r17 = −5.823
d17 = 1.264
N10 = 1.84506
ν10 = 23.66

r18* = 4.320
d18 =

2.396˜6.046˜17.499

(Gr5)

r19* = −19.624
d19 = 2.719
N11 = 1.52200
ν11 = 52.20

r20* = −5.442
d20 = 0.600

(PL)

r21 = ∞
d21 = 1.667
N12 = 1.51680
ν12 = 64.20

r22 = ∞
d22 = 0.556

r23 = ∞
d23 = 0.833
N13 = 1.51680
ν13 = 64.20

r24 = ∞

Aspherical Surface Data of Surface r5

ε = 1.0000, A4 = 0.43287302 × 10−3,

A6 = −0.23455601 × 10−4, A8 = 0.61044666 × 10−6,

A10 = −0.73047026 × 10−8

Aspherical Surface Data of Surface r6

ε = 1.0000, A4 = 0.35966870 × 10−3,

A6 = −0.24537299 × 10−4, A8 = 0.65258692 × 10−6,

A10 = −0.80900599 × 10−8

Aspherical Surface Data of Surface r18

ε = 1.0000, A4 = 0.19355856 × 10−3,

A6 = 0.37255767 × 10−4, A8 = −0.71943922 × 10−5

Aspherical Surface Data of Surface r19

ε = 1.0000, A4 = 0.20399908 × 10−4,

A6 = −0.15841416 × 10−4, A8 = −0.23969077 × 10−5,

A10 = 0.62558678 × 10−7

Aspherical Surface Data of Surface r20

ε = 1.0000, A4 = 0.20176156 × 10−2,

A6 = −0.66245685 × 10−4, A8 = 0.13610484 × 10−5

[0077]

3

TABLE 3

Example 3

f = 4.70˜8.93˜18.33

FNO = 2.80˜3.70˜4.70

Radius of
Axial
Refractive
Abbe

Curvature
Distance
Index
Number

(Gr1)

r1 = 30.875
d1 = 0.954
N1 = 1.85000
ν1 = 40.04

r2 = 9.153
d2 = 2.354

r3 = ∞
d3 = 10.100
N2 = 1.84666
ν2 = 23.82

r4 = ∞
d4 = 6.292˜2.960˜1.300

(Gr2)

r5* = −15.727
d5 = 1.100
N3 = 1.52200
ν3 = 52.20

r6* = 12.473
d6 = 0.918

r7 = 12.002
d7 = 1.500
N4 = 1.80518
ν4 = 25.43

r8 = 94.922
d8 =

13.325˜5.877˜0.700

(Gr3)

r9 = 84.102
d9 = 1.948
N5 = 1.69100
ν5 = 54.75

r10 = −9.398
d10 = 0.800
N6 = 1.84666
ν6 = 23.82

r11 = −18.254
d11 =

0.500˜6.977˜2.315

(ST)

r12 = ∞
d12 = 0.722

(Gr4)

r13 = 6.914
d13 = 2.634
N7 = 1.67000
ν7 = 57.07

r14 = −178.846
d14 = 0.500

r15 = −110.237
d15 = 3.600
N8 = 1.71300
ν8 = 53.93

r16 = −6.743
d16 = 0.010
N9 = 1.51400
ν9 = 42.83

r17 = −6.743
d17 = 1.000
N10 = 1.83400
ν10 =37.05

r18 = 7.808
d18 = 0.897

r19* = 10.638
d19 = 1.818
N11 = 1.84506
ν11 = 23.66

r20 = 8.447
d20 =

1.166˜5.469˜16.967

(Gr5)

r21* = −16.174
d21 = 2.116
N12 = 1.52200
ν12 = 52.20

r22* = −5.130
d22 = 0.600

(PL)

r23 = ∞
d23 = 1.667
N13 = 1.51680
ν13 = 64.20

r24 = ∞
d24 = 0.556

r25 = ∞
d25 = 0.833
N14 = 1.51680
ν14 = 64.20

r26 = ∞

Aspherical Surface Data of Surface r5

ε = 1.0000, A4 = 0.17397967 × 10−2,

A6 = −0.91160979 × 10−4, A8 = 0.29224094 × 10−5,

A10 = −0.40584567 × 10−7

Aspherical Surface Data of Surface r6

ε = 1.0000, A4 = 0.16445071 × 10−2,

A6 = −0.88694544 × 10−4, A8 = 0.27470200 × 10−5,

A10 = −0.36829935 × 10−7

Aspherical Surface Data of Surface r19

ε = 1.0000, A4 = −0.10051789 × 10−2,

A6 = −0.43416227 × 10−4, A8 = −0.94308727 × 10−6

Aspherical Surface Data of Surface r21

ε = 1.0000, A4 = −0.11122267 × 10−2,

A6 = 0.69843781 × 10−4, A8 = −0.56596129 × 10−5,

A10 = 0.16600757 × 10−7

Aspherical Surface Data of Surface r22

ε = 1.0000, A4 = 0.10462187 × 10−2,

A6 = 0.16953135 × 10−4, A8 = −0.13778696 × 10−5

[0078]

4

TABLE 4

Example 4

f = 4.65˜10.70˜21.39

FNO = 2.80˜3.70˜4.74

Radius of
Axial
Refractive
Abbe

Curvature
Distance
Index
Number

(Gr1)

r1 = 31.684
d1 = 0.900
N1 = 1.75450
ν1 = 51.57

r2 = 8.835
d2 = 2.500

r3 = ∞
d3 = 9.800
N2 = 1.84666
ν2 = 23.82

r4 = ∞
d4 = 1.787˜2.959˜1.200

(Gr2)

r5* = −11.414
d5 = 1.200
N3 = 1.52200
ν3 = 52.20

r6* = 18.668
d6 = 0.920

r7 = 14.124
d7 = 1.500
N4 = 1.80518
ν4 = 25.43

r8 = 89.378
d8 =

20.132˜6.055˜0.700

(Gr3)

r9 = 15.760
d9 = 2.270
N5 = 1.75450
ν5 = 51.57

r10 = −18.349
d10 = 0.350

r11 = −31.434
d11 = 0.800
N6 = 1.84506
ν6 = 23.66

r12* = 58.279
d12 =

0.586˜7.312˜0.715

(ST)

r13 = ∞
d13 = 0.722

(Gr4)

r14 = 7.070
d14 = 3.262
N7 = 1.75450
ν7 = 51.57

r15 = −68.783
d15 = 0.010
N8 = 1.51400
ν8 = 42.83

r16 = −68.783
d16 = 0.800
N9 = 1.80750
ν9 = 35.43

r17 = 5.297
d17 = 1.121

r18 = 8.058
d18 = 0.900
N10 = 1.80420
ν10 = 46.50

r19 = 4.975
d19 = 0.010
N11 = 1.51400
ν11 = 42.83

r20 = 4.975
d20 = 2.275
N12 = 1.54072
ν12 = 47.20

r21 = 55.131
d21 =

2.641˜9.825˜24.000

(Gr5)

r22* = −5.314
d22 = 2.000
N13 = 1.52200
ν13 = 52.20

r23* = −4.081
d23 =

2.069˜1.065˜0.600

(PL)

r24 = ∞
d24 = 1.667
N14 = 1.51680
ν14 = 64.20

r25 = ∞
d25 = 0.556

r26 = ∞
d26 = 0.833
N15 = 1.51680
ν15 = 64.20

r27 = ∞

Aspherical Surface Data of Surface r5

ε = 1.0000, A4 = 0.19404962 × 10−2,

A6 = −0.72306807 × 10−4, A8 = 0.17014805 × 10−5,

A10 = −0.18473122 × 10−7

Aspherical Surface Data of Surface r6

ε = 1.0000, A4 = 0.17248932 × 10−2,

A6 = −0.67033494 × 10−4, A8 = 0.14953168 × 10−5,

A10 = −0.15314923 × 10−7

Aspherical Surface Data of Surface r12

ε = 1.0000, A4 = 0.12962356 × 10−3,

A6 = −0.64502263 × 10−6, A8 = 0.57374965 × 10−7

Aspherical Surface Data of Surface r22

ε = 1.0000, A4 = 0.14398755 × 10−2,

A6 = −0.34876040 × 10−3, A8 = 0.39600244 × 10−4,

A10 = −0.18945983 × 10−5

Aspherical Surface Data of Surface r23

ε = 1.0000, A4 = 0.31105119 × 10−2,

A6 = −0.10368421 × 10−3, A8 = 0.92555931 × 10−5

[0079]

5

TABLE 5

Example 5

f = 4.70˜8.93˜18.10

FNO = 2.80˜3.70˜4.70

Radius of
Axial
Refractive
Abbe

Curvature
Distance
Index
Number

(Gr1)

r1 = 32.033
d1 = 0.900
N1 = 1.85000
ν1 = 40.04

r2 = 9.233
d2 = 2.500

r3 = ∞
d3 = 9.700

r4 = ∞
d4 = 1.272˜2.425˜1.200

(Gr2)

r5* = −65.417
d5 = 1.100
N2 = 1.52200
ν2 = 52.20

r6* = 9.765
d6 = 1.053

r7 = 11.793
d7 = 1.500
N3 = 1.80518
ν3 = 25.43

r8 = 38.129
d8 =

17.792˜6.354˜0.891

(Gr3)

r9 = 147.242
d9 = 2.004
N4 = 1.67000
ν4 = 57.07

r10 = −10.505
d10 = 0.010
N5 = 1.51400
ν5 = 42.83

r11 = −10.505
d11 = 0.800
N6 = 1.84666
ν6 = 23.82

r12 = −18.332
d12 =

0.500˜5.652˜0.500

(ST)

r13 = ∞
d13 = 0.722

(Gr4)

r14 = 7.371
d14 = 2.439
N7 = 1.51823
ν7 = 58.96

r15 = 19.562
d15 = 1.250

r16 = 9.050
d16 = 4.900
N8 = 1.63980
ν8 = 34.55

r17 = −6.010
d17 = 0.010
N9 = 1.51400
ν9 = 42.83

r18 = −6.010
d18 = 1.200
N10 = 1.80358
ν10 = 25.38

r19* = 5.137
d19 =

2.392˜7.526˜19.365

(Gr5)

r20* = −18.506
d20 = 2.000
N11 = 1.52200
ν11 = 52.20

r21* = −5.511
d21 = 0.600

(PL)

r22 = ∞
d22 = 1.667
N12 = 1.51680
ν12 = 64.20

r23 = ∞
d23 = 0.500

r24 = ∞
d24 = 0.800
N13 = 1.51680
ν13 = 64.20

r25 = ∞

Aspherical Surface Data of Surface r5

ε = 1.0000, A4 = 0.64563886 × 10−3,

A6 = −0.25558214 × 10−4, A8 = 0.59377128 × 10−6,

A10 = −0.61695977 × 10−8

Aspherical Surface Data of Surface r6

ε = 1.0000, A4 = 0.56044458 × 10−3,

A6 = −0.25343628 × 10−4, A8 = 0.49999600 × 10−6,

A10 = −0.43643694 × 10−8

Aspherical Surface Data of Surface r19

ε = 1.0000, A4 = 0.90531135 × 10−3,

A6 = 0.55915513 × 10−4, A8 = −0.94268236 × 10−6

Aspherical Surface Data of Surface r20

ε = 1.0000, A4 = −0.65479574 × 10−3,

A6 = 0.14758923 × 10−3, A8 = −0.10576555 × 10−4,

A10 = 0.11273233 × 10−6

Aspherical Surface Data of Surface r21

ε = 1.0000, A4 = 0.12239465 × 10−2,

A6 = 0.68628623 × 10−4, A8 = −0.44116659 × 10−5

[0080]

6

TABLE 6

Example 6

f = 4.70˜8.93˜13.63

FNO = 2.80˜3.60˜4.60

Radius of
Axial
Refractive
Abbe

Curvature
Distance
Index
Number

(Gr1)

r1 = 30.317
d1 = 0.900
N1 = 1.85000
ν1 = 40.04

r2 = 9.248
d2 = 2.500

r3 = ∞
d3 = 9.500

r4 = ∞
d4 = 1.000˜1.550˜1.000

(Gr2)

r5* = 89.104
d5 = 1.100
N2 = 1.52200
ν2 = 52.20

r6* = 7.292
d6 = 1.090

r7 = 8.688
d7 = 1.500
N3 = 1.80518
ν3 = 25.43

r8 = 17.828
d8 =

13.974˜4.376˜0.945

(Gr3)

r9 = 57.157
d9 = 2.152
N4 = 1.69350
ν4 = 50.29

r10 = −8.089
d10 = 0.010
N5 = 1.51400
ν5 = 42.83

r11 = −8.089
d11 = 0.800
N6 = 1.84666
ν6 = 23.82

r12 = −15.704
d12 =

0.500˜5.073˜2.603

(ST)

r13 = ∞
d13 = 1.007

(Gr4)

r14 = 6.736
d14 = 6.200
N7 = 1.75450
ν7 = 32.83

r15 = −5.747
d15 = 0.010
N8 = 1.51400
ν8 = 42.83

r16 = −5.747
d16 = 1.058
N9 = 1.84666
ν9 = 23.82

r17 = 3.969
d17 = 1.000

r18* = 5.495
d18 = 1.300
N10 = 1.52200
ν10 = 52.20

r19* = 9.536
d19 =

1.143˜5.618˜12.069

(Gr5)

r20* = −20.361
d20 = 2.000
N11 = 1.52200
ν11 = 52.20

r21* = −5.452
d21 = 0.600

(PL)

r22 = ∞
d22 = 1.667
N12 = 1.51680
ν12 = 64.20

r23 = ∞
d23 = 0.500

r24 = ∞
d24 = 0.800
N13 = 1.51680
ν13 = 64.20

r25 = ∞

Aspherical Surface Data of Surface r5

ε = 1.0000, A4 = 0.87396872 × 10−3,

A6 = −0.30397334 × 10−4, A8 = 0.74909239 × 10−6,

A10= −0.71781784 × 10−8

Aspherical Surface Data of Surface r6

ε = 1.0000, A4 = 0.82198127 × 10−3,

A6 = −0.33486093 × 10−4, A8 = 0.74661790 × 10−6,

A10 = −0.77317664 × 10−8

Aspherical Surface Data of Surface r18

ε = 1.0000, A4 = −0.57027267 × 10−4,

A6 = −0.15173011 × 10−3, A8 = −0.85190287 × 10−5

Aspherical Surface Data of Surface r19

ε = 1.0000, A4 = 0.80317196 × 10−3,

A6 = −0.11792837 × 10−3, A8 = −0.12597351 × 10−4

Aspherical Surface Data of Surface r20

ε = 1.0000, A4 = −0.22043670 × 10−2,

A6 = 0.23264595 × 10−3, A8 = −0.12158021 × 10−4,

A10 = 0.12029400 × 10−6

Aspherical Surface Data of Surface r21

ε = 1.0000, A4 = −0.44995495 × 10−3,

A6 = 0.16400088 × 10−3, A8 = −0.58139874 × 10−5

[0081]

7

TABLE 7

Example 7

f = 3.80˜7.22˜11.02

FNO = 2.80˜3.68˜4.30

Radius of
Axial
Refractive
Abbe

Curvature
Distance
Index
Number

(Gr1)

r1 = 52.097
d1 = 0.900
N1 = 1.85000
ν1 = 40.04

r2 = 12.254
d2 = 2.500

r3 = ∞
d3 = 9.400
N2 = 1.84666
ν2 = 23.82

r4 = ∞
d4 = 1.302˜2.345˜1.200

(Gr2)

r5* = −38.002
d5 = 1.400
N3 = 1.52200
ν3 = 52.20

r6* = 6.643
d6 = 1.800

r7 = 10.201
d7 = 2.009
N4 = 1.67339
ν4 = 29.25

r8 = 203.867
d8 =

17.613˜5.105˜0.756

(Gr3)

r9 = 43.330
d9 = 1.782
N5 = 1.62280
ν5 = 56.88

r10 = −10.110
d10 = 1.500
N6 = 1.84666
ν6 = 23.82

r11 = −17.478
d11 =

0.500˜8.035˜7.834

(ST)

r12 = ∞
d12 = 0.730

(Gr4)

r13 = 5.497
d13 = 1.883
N7 = 1.58144
ν7 = 40.89

r14 = 46.771
d14 = 0.373

r15 = 15.807
d15 = 2.400
N8 = 1.71736
ν8 = 29.42

r16 = −5.965
d16 = 0.010
N9 = 1.51400
ν9 = 42.83

r17 = −5.965
d17 = 1.200
N10 = 1.84506
ν10 = 23.66

r18* = 4.850
d18 =

2.224˜6.154˜11.849

(Gr5)

r19* =
d19 = 2.430
N11 = 1.52200
ν11 = 52.20

−4863.577

r20* = −5.589
d20 = 0.600

(PL)

r21 = ∞
d21 = 1.667
N12 = 1.51680
ν12 = 64.20

r22 = ∞
d22 = 0.556

r23 = ∞
d23 = 0.833
N13 = 1.51680
ν13 = 64.20

r24 = ∞

Aspherical Surface Data of Surface r5

ε = 1.0000, A4 = 0.90321155 × 10−3,

A6 = −0.32868934 × 10−4, A8 = 0.81046767 × 10−6,

A10 = −0.95744135 × 10−8

Aspherical Surface Data of Surface r6

ε = 1.0000, A4 = 0.62734987 × 10−3,

A6 = −0.40992204 × 10−4, A8 = 0.10153820 × 10−5,

A10 = −0.19962695 × 10−7

Aspherical Surface Data of Surface r18

ε = 1.0000, A4 = 0.14206040 × 10−2,

A6 = 0.10547883 × 10−3, A8 = 0.27427281 × 10−5,

Aspherical Surface Data of Surface r19

ε = 1.0000, A4 = −0.89207427 × 10−3,

A6 = 0.68444545 × 10−5, A8 = −0.52772806 × 10−5,

A10 = 0.47336185 × 10−7

Aspherical Surface Data of Surface r20

ε = 1.0000, A4 = 0.10320751 × 10−2,

A6 = −0.36561311 × 10−4, A8 = −0.10818467 × 10−5

[0082]

8

TABLE 8

(1)
(2), (2a)

|f1/fW|
|f12/fW|

Example 1
2.850
2.521

Example 2
3.287
2.820

Example 3
3.323
2.572

Example 4
3.552
2.353

Example 5
3.307
2.569

Example 6
3.398
2.456

Example 7
5.013
3.495

Taking lens apparatus

Information

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Date Filed

Date Published

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CPC

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Abstract

Description

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Priority Claims (1)