Zoom lens and imaging device

Abstract

To provide a zoom lens which is advantageous in terms of optical characteristics and compactness, for example.SOLUTION: A zoom lens (ZL) is provided, comprising a first portion (L1) including a focusing lens group configured to move for focusing, a second portion (L2, L3, L4) including a zooming lens group configured to move for zooming, an aperture stop (SP), and an imaging portion (L5) configured to be stationary for zooming, arranged in order from the object side to the image side. The imaging portion comprises, in order from the object side to the image side, a splitting element (L5PR) for splitting a luminous flux into reflected light and transmitted light, a lens group (L5N) having negative refractive power, a focal length changing lens group (L5IE) configured to be insertable to a light path to modify a focal length of the zoom lens, and a lens group (L5R) having positive refractive power.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a zoom lens and an imaging apparatus. [Background technology]

[0002] There is known an optical system that includes a branching element that branches a part of a light beam in an optical path and has an additional function such as an autofocus function using the part of the light beam (Patent Documents 1 and 2). Patent Documents 1 and 2 disclose a zoom lens that includes an imaging optical section that has an imaging function that does not move for changing the magnification, and that includes the branching element. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5031475 [Patent Document 2] JP 2018-128520 A Summary of the Invention [Problem to be solved by the invention]

[0004] The zoom lenses disclosed in Patent Documents 1 and 2 have a branching element disposed in the imaging optical section, which may be disadvantageous in terms of optical characteristics and compactness. An object of the present invention is to provide a zoom lens that is advantageous in terms of optical characteristics and compactness, for example. [Means for solving the problem]

[0005] The zoom lens according to one aspect of the present invention includes a focusing lens that moves for focusing in order from the object side to the image side. Jiaogun Including the first Lens group and move to change magnification Two or more Variable magnification lens group The intermediate group consists of And it does not move for aperture and magnification. Rear lens group and , and the spacing between adjacent lens groups changes during zooming. A zoom lens comprising: Rear lens groupThe optical system includes, in order from the object side to the image side, a splitter element that splits a light beam into reflected light and transmitted light, and a negative refractive power negative a focal length variable lens group that is insertable into and removable from an optical path to change the focal length of the zoom lens; Saragun and has a positive refractive power. Positive Group and 、 has.

[0006] Other objects and features of the present invention will be described in the following embodiments. Effect of the Invention

[0007] According to the present invention, for example, a zoom lens that is advantageous in terms of optical characteristics and compactness can be provided. [Brief description of the drawings]

[0008] [Figure 1] 1 is a cross-sectional view of a zoom lens at a wide-angle end in a first embodiment. [Diagram 2] 4A to 4C are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens in Example 1. [Diagram 3] FIG. 11 is a cross-sectional view of a zoom lens at a wide-angle end in a second embodiment. [Figure 4] 8A to 8C are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens in Example 2. [Diagram 5] FIG. 11 is a cross-sectional view of a zoom lens at a wide-angle end in a third embodiment. [Figure 6] 11A to 11C are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens in Example 3. [Figure 7] FIG. 11 is a cross-sectional view of a zoom lens at a wide-angle end in a fourth embodiment. [Figure 8] 11A to 11C are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens in Example 4. [Figure 9] FIG. 13 is a cross-sectional view of a zoom lens at a wide-angle end in a fifth embodiment. [Figure 10] 13A to 13C are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens in Example 5. [Figure 11]FIG. 2 is a schematic diagram showing the configuration from the aperture of a zoom lens to an image plane in each embodiment. [Figure 12] 1 illustrates an example of the configuration of an image pickup apparatus equipped with a zoom lens in each embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0010] First, referring to FIG. 1, the zoom lens ZL in this embodiment will be described. FIG. 1 is a cross-sectional view of the zoom lens ZL. The zoom lens ZL has, in order from the object side to the image side, a first section including a focusing lens group that moves for focusing, a second section including a magnification lens group that moves for magnification, an aperture SP, and an imaging section that does not move for magnification. In the zoom lens ZL shown in FIG. 1, the first section corresponds to the first lens group L1, the second section corresponds to the second lens group L2, the third lens group L3, and the fourth lens group L4, and the imaging section corresponds to the fifth lens group L5. The imaging section has, in order from the object side to the image side, a branching element (prism L5PR) that branches a light beam from the aperture SP side into reflected light and transmitted light, a lens group L5N having negative refractive power, a lens group L5IE, and a lens group (rear relay group) L5R having positive refractive power. The lens group L5IE is a focal length changing lens group that can be inserted into or removed from the optical path in order to change the focal length of the zoom lens ZL.

[0011] The light beam split by the splitting element is used to add a new function to the zoom lens ZL. By providing a splitting element that splits the light beam, the distance between the aperture SP and the imaging surface increases, so that the position of the exit pupil becomes closer to the imaging position. As a result, for example, when applied to a three-chip television camera having a color separation optical system, white shading occurs, making it difficult to obtain good optical performance. In this embodiment, a lens group L5N having a negative refractive power is disposed near the splitting element. This makes it possible to lengthen the exit pupil position, and to achieve good optical performance with suppressed white shading.

[0012] Next, the configuration from the aperture SP to the image surface IP in the zoom lens ZL in this embodiment will be described with reference to FIG. 11. FIG. 11 is a schematic diagram showing the configuration from the aperture SP to the image surface IP in the zoom lens ZL. Here, the distance from the aperture SP to the transmission exit surface S1 of the branching element LD is dP, and the distance (air-equivalent length) from the aperture SP to the image surface IP of the entire system of the zoom lens ZL is dT. Also, the effective beam diameter of the transmission exit surface S1 of the branching element LD is DB, the effective beam diameter of the branching exit surface S2 of the branching element LD is DC, and the thickness (total thickness) of the focal length changing lens group (extender lens EX) is dIE. In this case, it is preferable that the zoom lens ZL satisfies at least one of the following conditional expressions (1) to (3).

[0013] 0.00 <dP / dT<0.40 ···(1) 0.25 <DC / DB<0.77 ···(2) 0.00 <dIE / (dT-dP)<0.40 ···(3) If the distance dP is too large relative to the distance dT and exceeds the upper limit of conditional formula (1), the position of the exit pupil becomes close to the image position, causing white shading and making it difficult to obtain good optical performance. Alternatively, if the distance dT is too small relative to the distance dP and exceeds the upper limit of conditional formula (1), it becomes difficult to ensure a sufficient distance for inserting an extender lens. It also becomes difficult to ensure the distance for adjusting the flange back and moving the lens groups for the macro mechanism, as well as the space for the holding mechanism that holds these.

[0014] In addition, if the effective beam diameter DC is too small relative to the effective beam diameter DB and exceeds the lower limit of conditional formula (2), the width of the beam guided to the lens group after branching by the branching element LD becomes narrow, so that the added function is limited. Alternatively, if the effective beam diameter DB is too large relative to the effective beam diameter DC and exceeds the lower limit of conditional formula (2), the lens diameter of the zoom lens ZL becomes large, making it difficult to achieve a small and lightweight lens and to ensure good optical performance with a simple lens configuration. On the other hand, if the effective beam diameter DB is too small relative to the effective beam diameter DC and exceeds the upper limit of conditional formula (2), it becomes difficult to obtain a back focus of an appropriate length and to realize a bright F-number in the zoom lens ZL. In addition, it becomes difficult to ensure good optical performance with a simple lens configuration. In addition, when the extender lens EX is disposed on the image plane side of the branching element LD, the focal length is shifted by the extender lens EX, making it difficult to ensure a high afocal magnification. Alternatively, if the effective beam diameter DC is too large relative to the effective beam diameter DB and exceeds the upper limit of conditional expression (2), it becomes difficult to make the lens group after branching small and lightweight.

[0015] More preferably, the numerical ranges of conditional expressions (1) to (3) are set as shown in the following conditional expressions (1a) to (3a), respectively.

[0016] 0.00 <dP / dT<0.39 ···(1a) 0.26 <DC / DB<0.76 ···(2a) 0.00 <dIE / (dT-dP)<0.35 ···(3a) In this embodiment, when the angle between the reflecting surface S3 that splits the light beam in the splitting element LD and the optical axis OA is θr (degrees), it is preferable that the following conditional expression (4) be satisfied.

[0017] 53<θr<67 (4) If the upper limit of conditional expression (4) is exceeded, the width of the light beam guided by the branching element LD to the post-branching lens group becomes narrow, limiting the added functionality. On the other hand, if the lower limit of conditional expression (4) is exceeded, the position of the exit pupil becomes close to the imaging position, causing white shading and making it difficult to obtain good optical performance with a simple lens configuration. In addition, the optical path length in the branching element LD relative to the post-branching lens group becomes long, making it difficult to achieve a compact and lightweight design.

[0018] It is more preferable that the numerical range of conditional expression (4) is set so as to satisfy the following conditional expression (4a).

[0019] 54<θr<65 (4a) In the branching element LD of this embodiment, when the focal length of the lens group LN having negative refractive power arranged in the vicinity of the branching element LD is fn and the focal length of the lens group (rear relay group) RR having positive refractive power is fp, it is preferable to satisfy the following conditional expression (5).

[0020] -4 <fn / fp<-1 ···(5) If the lower limit of conditional expression (5) is exceeded, the refractive power of the lens group L5N having negative refractive power becomes too strong, and the optical performance deteriorates, particularly when the focal length is shifted to the telephoto side by the extender lens. On the other hand, if the upper limit of conditional expression (5) is exceeded, the refractive power of the lens group L5N becomes too weak, and the exit pupil position becomes short, causing white shading and making it difficult to obtain good optical performance.

[0021] It is more preferable that the numerical range of conditional expression (5) is set so as to satisfy the following conditional expression (5a):

[0022] -3 <fn / fp<-1 ···(5a) EXAMPLES

[0023] Next, a zoom lens ZL1 in a first embodiment of the present invention will be described with reference to FIG. 1 and FIG. 2. FIG. 1 is a cross-sectional view of the zoom lens ZL1 in this embodiment at the wide-angle end. The zoom lens ZL1 has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, an aperture SP, and a fifth lens group L5 with positive refractive power, which are arranged in this order from the object side to the image side. In this embodiment, the second section is made up of three lens groups, which are a negative lens group (second lens group L2), a positive lens group (third lens group L3), and a positive lens group (fourth lens group L4), which are arranged in this order from the object side to the image side. The fifth lens group L5 is the final lens group arranged closest to the image side. GB is a glass block such as a prism that constitutes a color separation optical system or the like. IP is an image surface. The imaging surface of an imaging element and the film surface of a silver halide film are arranged on the image surface IP.

[0024] During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the fifth lens group L5 are stationary, the second lens group L2 moves toward the image side, and the third lens group L3 and the fourth lens group L4 move. The fifth lens group L5 is composed of a lens group L5IS, a prism L5PR, and lens groups L5N, L5IE, and L5R arranged in this order from the object side to the image side. The lens group L5IS is movable in a direction perpendicular to the optical axis OA and has a vibration-proof function. The prism L5PR is a branching element that branches a part of the incident light beam. The lens group L5N has negative refractive power. The lens group L5IE is configured to be insertable and removable to change the focal length. The lens group L5R has positive refractive power and has an imaging function.

[0025] 2A and 2B are aberration diagrams at the wide-angle end and the telephoto end of Numerical Example 1 corresponding to this embodiment, respectively. In the spherical aberration diagram, Fno indicates the F-number, the solid line indicates the spherical aberration for the e-line (wavelength 594.6 nm), and the two-dot chain line indicates the spherical aberration for the g-line (wavelength 435.8 nm). In the astigmatism diagram, the solid line S indicates the sagittal image plane, and the dashed line M indicates the meridional image plane. The distortion aberration indicates the distortion for the e-line. The chromatic aberration diagram indicates the chromatic aberration of magnification for the g-line. ω is the half angle of view (degrees). The above explanation of the aberration diagram in FIG. 2 is the same for the other embodiments (FIGS. 4, 6, 8, and 10). EXAMPLES

[0026] Next, a zoom lens ZL2 in a second embodiment of the present invention will be described with reference to FIG. 3 and FIG. 4. FIG. 3 is a cross-sectional view of the zoom lens ZL2 in the second embodiment at the wide-angle end. The zoom lens ZL2 has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, an aperture SP, and a fourth lens group L4 with positive refractive power, which are arranged in this order from the object side to the image side. In this embodiment, the second section is made up of two lens groups, a negative lens group (second lens group L2) and a positive lens group (third lens group L3), which are arranged in this order from the object side to the image side. The fourth lens group L4 is the final lens group arranged closest to the image side. GB is a glass block such as a prism that constitutes a color separation optical system or the like. IP is an image surface. The imaging surface of an imaging element and the film surface of a silver halide film are arranged on the image surface IP.

[0027] During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the fourth lens group L4 are stationary, the second lens group L2 moves toward the image side, and the third lens group L3 moves. The fourth lens group L4 is composed of a lens group L4IS, a prism L4PR, and lens groups L4N, L4IE, and L4R arranged in this order from the object side to the image side. The lens group L4IS is movable in a direction perpendicular to the optical axis OA and has a vibration-proof function. The prism L4PR is a branching element that branches a part of the incident light beam. The lens group L4N has negative refractive power. The lens group L4IE is configured to be insertable and removable to change the focal length. The lens group L4R has positive refractive power and has an imaging function.

[0028] 4A and 4B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of Numerical Example 2 corresponding to this embodiment. EXAMPLES

[0029] Next, a zoom lens ZL3 in a third embodiment of the present invention will be described with reference to FIG. 5 and FIG. 6. FIG. 5 is a cross-sectional view of the zoom lens ZL3 in the present embodiment at the wide-angle end. The zoom lens ZL3 has, in order from the object side to the image side, a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, a fifth lens group L5 with positive refractive power, an aperture SP, and a sixth lens group L6 with positive refractive power. In this embodiment, the second section is made up of four lens groups, which are arranged in order from the object side to the image side, namely, a negative lens group (second lens group L2), a positive lens group (third lens group L3), a positive lens group (fourth lens group L4), and a positive lens group (fifth lens group L5). The sixth lens group L6 is the final lens group arranged closest to the image side. GB is a glass block such as a prism that constitutes a color separation optical system or the like. IP is an image surface. The imaging surface of an imaging element or the film surface of a silver halide film is placed on the image plane IP.

[0030] During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the sixth lens group L5 are stationary, the second lens group L2 and the third lens group L3 move toward the image side, and the fourth lens group L4 and the fifth lens group L5 move. The sixth lens group L6 is composed of a lens group L6IS, a prism L6PR, and lens groups L6N, L6IE, and L6R arranged in this order from the object side to the image side. The lens group L6IS is movable in a direction perpendicular to the optical axis OA and has a vibration-proof function. The prism L6PR is a branching element that branches a part of the incident light beam. The lens group L6N has negative refractive power. The lens group L6IE is configured to be insertable and removable to change the focal length. The lens group L6R has positive refractive power and has an imaging function.

[0031] 6A and 6B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of Numerical Example 3 corresponding to this embodiment. EXAMPLES

[0032] Next, a zoom lens ZL4 according to a fourth embodiment of the present invention will be described with reference to FIG. 7 and FIG. 8. FIG. 7 is a cross-sectional view of the zoom lens ZL4 at the wide-angle end in this embodiment. The zoom lens ZL4 has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, an aperture SP, and a fifth lens group L5 with positive refractive power, which are arranged in this order from the object side to the image side. In this embodiment, the second section is made up of three lens groups, which are a negative lens group (second lens group L2), a positive lens group (third lens group L3), and a positive lens group (fourth lens group L4), which are arranged in this order from the object side to the image side. The fifth lens group L5 is the final lens group arranged closest to the image side. GB is a glass block such as a prism that constitutes a color separation optical system or the like. IP is an image surface. The imaging surface of an imaging element and the film surface of a silver halide film are arranged on the image surface IP.

[0033] During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the fifth lens group L5 are stationary, the second lens group L2 moves toward the image side, and the third lens group L3 and the fourth lens group L4 move. The fifth lens group L5 is composed of a lens group L5IS, a prism L5PR, and lens groups L5N, L5IE, and L5R arranged in this order from the object side to the image side. The lens group L5IS is movable in a direction perpendicular to the optical axis OA and has a vibration-proof function. The prism L5PR is a branching element that branches a part of the incident light beam. The lens group L5N has negative refractive power. The lens group L5IE is configured to be insertable and removable to change the focal length. The lens group L5R has positive refractive power and has an imaging function.

[0034] 8A and 8B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of Numerical Example 4 corresponding to this embodiment. EXAMPLES

[0035] Next, a zoom lens ZL5 according to a fifth embodiment of the present invention will be described with reference to FIG. 9 and FIG. 10. FIG. 9 is a cross-sectional view of the zoom lens ZL5 at the wide-angle end in this embodiment. The zoom lens ZL5 has a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with positive refractive power, an aperture SP, and a fifth lens group L5 with positive refractive power, which are arranged in this order from the object side to the image side. In this embodiment, the second section is made up of three lens groups, which are a negative lens group (second lens group L2), a positive lens group (third lens group L3), and a positive lens group (fourth lens group L4), which are arranged in this order from the object side to the image side. The fifth lens group L5 is the final lens group arranged closest to the image side. GB is a glass block such as a prism that constitutes a color separation optical system or the like. IP is an image surface. The imaging surface of an imaging element and the film surface of a silver halide film are arranged on the image surface IP.

[0036] During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the fifth lens group L5 are stationary, the second lens group L2 moves toward the image side, and the third lens group L3 and the fourth lens group L4 move. The fifth lens group L5 is composed of a lens group L5IS, a prism L5PR, and lens groups L5N, L5IE, and L5R arranged in this order from the object side to the image side. The lens group L5IS is movable in a direction perpendicular to the optical axis OA and has a vibration-proof function. The prism L5PR is a branching element that branches a part of the incident light beam. The lens group L5N has negative refractive power. The lens group L5IE is configured to be insertable and removable to change the focal length. The lens group L5R has positive refractive power and has an imaging function.

[0037] 10A and 10B are aberration diagrams at the wide-angle end and the telephoto end, respectively, of Numerical Example 5 corresponding to this embodiment.

[0038] Numerical Examples 1 to 5 are shown below. In each of the numerical examples, r is the radius of curvature (mm) of the ith surface from the object side, and d is the lens thickness or air space (mm) between the ith and (i+1)th surfaces. The (variable) in d indicates that the air space changes during zooming, and the air space corresponding to the focal length is shown in a separate table. In addition, nd is the refractive index of the material of the ith optical component with respect to the d line. νd is the Abbe number based on the d line of the material of the ith optical component.

[0039] The Abbe number νd is expressed as follows, where Nd, NF, and NC are the refractive indices at the d line (587.6 nm), F line (486.1 nm), and C line (656.3 nm) of the Fraunhofer lines: νd=(Nd-1) / (NF-NC) It is expressed as:

[0040] In each numerical example, the half angle of view (degrees) of the zoom lens is shown, and the maximum image height that determines the half angle of view is shown as "image height." The lens group data indicates the focal length of each lens group. "BF" is the back focus (mm). The back focus is the distance on the optical axis from the final lens surface (the lens surface closest to the image) of the zoom lens to the paraxial image surface, expressed as an air-equivalent length. The "total lens length" is the distance on the optical axis from the foreground (the lens surface closest to the object) of the zoom lens to the final lens surface plus the back focus.

[0041] An asterisk (*) next to a surface number indicates that the surface has an aspheric shape. The aspheric shape is expressed by the following formula, where X is the position in the optical axis direction, H is the height in the direction perpendicular to the optical axis, the direction of light travel is positive, R is the paraxial radius of curvature, K is the conic constant, and A3 to A16 are aspheric coefficients.

[0042]

number

[0043] For the conic constant and aspheric coefficient, e±X is x10 ±X This means:

[0044] Moreover, values ​​corresponding to the above-mentioned conditional expressions (1) to (5) in Numerical Examples 1 to 5 are summarized in Table 1.

[0045] (Numerical Example 1) Unit: mm Surface Data Surface number rd nd νd Effective diameter 1 -2942.188 6.00 1.83481 42.7 212.06 2 335.459 1.80 200.18 3 335.066 23.71 1.43387 95.1 199.56 4 -1057.929 0.20 198.21 5 525.299 14.68 1.43387 95.1 200.37 6 -2449.905 25.25 200.48 7 377.042 20.53 1.43387 95.1 201.11 8 -1365.497 0.25 200.62 9 306.954 16.16 1.43387 95.1 194.85 10 1716.232 1.50 193.64 11 188.244 16.19 1.43875 94.7 181.77 12 408.078 (variable) 179.80 13* -532.824 2.20 2.00330 28.3 45.15 14 38.132 11.72 38.75 15 -44.546 1.45 1.74320 49.3 37.57 16 72.565 9.77 1.89286 20.4 39.69 17 -46.484 1.63 40.65 18 -41.758 2.00 1.88300 40.8 40.58 19 -152.608 (variable) 43.27 20 152.336 11.49 1.72916 54.7 83.61 21* -265.715 6.62 83.89 22 139.888 13.50 1.43875 94.7 84.25 23 -246.304 0.50 83.64 24 264.094 2.60 1.85478 24.8 80.65 25 97.106 (variable) 77.84 26 86.506 15.39 1.49700 81.5 78.13 27 -236.969 0.50 77.29 28 415.877 2.50 1.80518 25.4 73.89 29 139.362 7.85 1.60311 60.6 71.54 30* -764.201 (variable) 70.33 31(Aperture) ∞ 5.46 34.13 32 -100.588 1.40 1.88300 40.8 31.36 33 50.285 1.36 30.49 34 40.817 3.60 1.92286 18.9 30.97 35 96.042 4.19 30.49 36 -79.866 1.70 1.80400 46.5 30.15 37 -114.439 5.00 30.25 38 ∞ 17.45 1.83481 42.7 29.48 39 ∞ 1.50 28.26 40 471.053 2.00 2.00100 29.1 28.04 41 61.204 5.25 27.73 42 -154.723 1.50 1.88300 40.8 28.59 43 48.981 6.45 1.84666 23.8 29.66 44 -66.247 0.20 30.27 45 -246.690 9.17 1.43875 94.7 30.38 46 -32.301 0.20 30.90 47 -62.829 8.38 1.81600 46.6 30.04 48 -21.384 1.50 2.00100 29.1 30.15 49 -126.267 8.68 31.50 50 -1310.821 1.40 1.83481 42.7 32.95 51 36.358 7.90 1.80518 25.4 33.47 52 -196.957 0.28 33.81 53 146.796 7.95 1.48749 70.2 33.94 54 -38.232 1.62 2.00100 29.1 33.83 55 -82.855 0.99 34.75 56 -132.295 5.94 1.60562 43.7 35.05 57 -40.442 0.22 35.68 58 109.076 6.96 1.64000 60.1 34.20 59 -47.080 1.62 2.00100 29.1 33.48 60 -140.064 9.82 33.17 61∞ 33.00 1.60859 46.4 60.00 62 ∞ 13.20 1.51633 64.2 60.00 63 ∞ (variable) 60.00 Image plane ∞ Aspheric Data Page 13 K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400e-022 A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020 Page 21 K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16=-4.73901e-027 A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025 Page 30 K =-2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026 A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025 Various data Zoom ratio 120.00 Wide Angle Mid-Telephoto Focal length 8.50 100.01 1020.12 F-number 1.75 1.75 5.25 Half angle of view 32.90 3.15 0.31 Image height 5.50 5.50 5.50 Lens total length 687.65 687.65 687.65 BF 51.79 51.79 51.79 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d63 12.80 12.80 12.80 Entrance pupil position 133.62 1087.78 14063.25 Exit pupil position 105.45 105.45 105.45 Front principal point position 142.91 1295.75 26315.29 Back principal point position 4.30 -87.21 -1007.32 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 251.50 126.27 72.69 -19.27 2 13 -24.07 28.78 3.62 -16.98 3 20 134.62 34.71 -5.03 -27.55 4 26 112.37 26.24 4.27 -13.07 5 31 35.15 175.88 58.05 16.34 Single lens data Lens starting surface focal length 1 1 -358.42 2 3 588.08 3 5 995.95 4 7 681.71 5 9 856.44 6 11 776.95 7 13 -35.11 8 15 -36.77 9 16 32.64 10 18 -65.28 11 20 133.77 12 22 205.02 13 24 -179.27 14 26 129.18 15 28 -258.97 16 29 195.31 17 32 -37.58 18 34 73.66 19 36 -334.48 20 38 0.00 21 40 -69.88 22 42 -41.74 23 43 33.81 24 45 83.41 25 47 36.22 26 48 -25.70 27 50 -42.12 28 51 38.35 29 53 62.90 30 54 -71.65 31 56 93.37 32 58 52.09 33 59 -70.90 34 61 0.00 35 62 0.00 (Numerical Example 2) Unit: mm Surface Data Surface number rd nd νd Effective diameter 1 1571.411 5.91 1.90366 31.3 212.83 2 361.491 3.13 205.43 3 389.831 20.85 1.43387 95.1 204.88 4 -1519.134 25.29 203.52 5 379.388 19.40 1.43387 95.1 198.91 6 -1690.060 0.25 198.64 7 270.376 20.46 1.43387 95.1 194.91 8 5840.434 1.18 193.83 9 190.778 14.41 1.59240 68.3 182.16 10 365.545 (variable) 180.35 11* 11015.733 2.20 2.00330 28.3 48.62 12 41.065 10.49 41.92 13 -62.377 1.40 1.88300 40.8 41.20 14 65.176 9.88 1.95906 17.5 42.38 15 -89.087 2.72 43.74 16 -51.909 1.60 1.83400 37.2 43.88 17 -103.320 (variable) 46.02 18 115.185 11.58 1.59201 67.0 78.48 19* -2087.691 0.50 78.91 20 142.758 13.08 1.59201 67.0 80.06 21 -231.655 0.20 79.67 22 122.793 2.50 1.80518 25.4 76.01 23 57.717 18.11 1.43387 95.1 71.57 24 -564.234 0.50 70.45 25* 364.246 6.50 1.49700 81.5 69.33 26 -414.835 (variable) 68.15 27(Aperture) ∞ 5.89 31.82 28 -147.172 1.40 1.81600 46.6 32.30 29 46.924 1.05 31.20 30 37.303 4.69 1.80810 22.8 31.30 31 420.501 3.37 30.90 32 -76.047 1.40 1.88300 40.8 30.60 33 191.170 5.00 30.40 34 ∞ 17.45 1.83481 42.7 26.69 35 ∞ 1.97 26.67 36 -187.826 3.00 2.00100 29.1 26.67 37 219.623 4.11 26.95 38 -136.321 1.50 1.88300 40.8 27.75 39 32.222 7.03 1.84666 23.8 29.11 40 -102.078 0.20 29.76 41 636.727 6.87 1.43875 94.7 30.11 42 -28.627 0.20 30.45 43 -53.593 8.46 1.81600 46.6 29.55 44 -20.189 1.50 2.00100 29.1 29.82 45 -84.825 10.38 31.50 46 -642.266 1.40 1.83481 42.7 33.03 47 51.345 6.92 1.80518 25.4 33.44 48 -134.244 0.28 33.77 49 223.175 7.51 1.48749 70.2 33.87 50 -39.389 1.62 2.00100 29.1 34.04 51 -97.007 0.99 35.14 52 -170.529 6.10 1.60562 43.7 35.46 53 -42.083 0.22 36.06 54 71.318 7.16 1.64000 60.1 34.42 55 -56.981 1.62 2.00100 29.1 33.53 56 -424.933 10.47 32.90 57 ∞ 33.00 1.60859 46.4 60.00 58 ∞ 13.20 1.51633 64.2 60.00 59 ∞ (variable) 60.00 Image plane ∞ Aspheric Data Page 11 K =-2.61129e+006 A 4= 1.14924e-006 A 6=-4.20242e-010 A 8= 7.06050e-012 A10= 1.71748e-014 A12=-3.95143e-018 A14=-2.50492e-020 A16= 2.74832e-023 A 3=-7.41007e-007 A 5=-2.86209e-008 A 7= 4.68402e-011 A 9=-6.67517e-013 A11=-2.87644e-016 A13= 1.44174e-018 A15=-1.26241e-021 Page 19 K =-8.09196e+003 A 4= 2.70610e-007 A 6= 1.07566e-009 A 8=-3.82716e-014 A10=-1.89869e-016 A12= 1.74435e-020 A14=-2.31461e-023 A16= 5.87253e-027 A 3=-1.02923e-007 A 5=-2.58308e-008 A 7=-1.15844e-011 A 9= 3.14187e-015 A11= 2.64931e-018 A13= 8.56747e-022 A15=-2.81713e-025 Page 25 K = 6.92275e+001 A 4=-4.53959e-007 A 6=-6.59771e-011 A 8=-3.55842e-013 A10=-1.48669e-016 A12= 8.98957e-020 A14= 6.50522e-022 A16= 1.24233e-026 A 3= 7.06566e-007 A 5=-1.77804e-008 A 7= 3.13155e-011 A 9= 8.81552e-016 A11=-1.46851e-017 A13= 1.62371e-021 A15=-1.37737e-023 Various data Zoom ratio 90.00 Wide Angle Mid-Telephoto Focal length 8.60 65.55 774.17 F-number 1.80 1.79 4.00 Half angle of view 32.60 4.80 0.41 Image height 5.50 5.50 5.50 Lens total length 649.64 649.64 649.64 BF 52.45 52.45 52.45 d10 3.03 140.03 186.75 d17 279.71 118.33 3.07 d26 3.00 27.38 95.93 d59 12.80 12.80 12.80 Entrance pupil position 126.14 812.29 9423.59 Exit pupil position 99.76 99.76 99.76 Front principal point position 135.59 927.24 17089.94 Back principal point position 4.20 -52.74 -761.37 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 248.14 110.88 64.60 -17.20 2 11 -27.25 28.28 3.76 -16.43 3 18 70.50 52.98 12.00 -25.30 4 27 35.42 175.98 59.01 11.19 Single lens data Lens starting surface focal length 1 1 -516.86 2 3 715.59 3 5 714.36 4 7 651.06 5 9 651.23 6 11 -40.75 7 13 -35.70 8 14 39.99 9 16 -126.08 10 18 184.10 11 20 150.63 12 22 -136.36 13 23 121.45 14 25 390.18 15 28 -43.24 16 30 49.86 17 32 -61.11 18 34 0.00 19 36 -99.96 20 38 -29.22 21 39 29.35 22 41 62.48 23 43 35.45 24 44 -26.57 25 46 -56.59 26 47 46.48 27 49 69.10 28 50 -66.66 29 52 90.13 30 54 50.40 31 55 -65.35 32 57 0.00 33 58 0.00 (Numerical Example 3) Unit: mm Surface Data Surface number rd nd νd Effective diameter 1 8902.108 5.50 1.83481 42.7 212.73 2 293.031 2.00 201.38 3 299.654 31.11 1.43387 95.1 201.16 4 -514.323 24.93 199.93 5 303.463 19.33 1.43387 95.1 198.19 6 6129.826 0.11 197.72 7 247.810 24.00 1.43387 95.1 194.28 8 -7103.045 1.50 192.96 9 181.463 14.73 1.43875 94.7 178.48 10 337.177 (variable) 176.29 11* -189.283 2.20 2.00330 28.3 44.83 12 37.392 11.68 38.21 13 -43.412 1.45 1.80000 29.8 37.22 14 53.807 13.14 1.89286 20.4 40.30 15 -37.787 (variable) 41.77 16 -33.150 2.00 1.81600 46.6 41.34 17* -95.423 (variable) 45.07 18 138.006 10.59 1.72916 54.7 79.68 19* -541.134 9.75 79.99 20 147.036 14.32 1.49700 81.5 82.31 21 -160.091 1.73 82.00 22 173.675 2.60 1.85478 24.8 77.06 23 80.581 (variable) 73.85 24 79.073 13.02 1.43875 94.7 74.08 25 -620.461 2.50 1.85478 24.8 73.29 26 399.958 2.39 72.27 27* 249.933 8.86 1.60311 60.6 71.69 28 -170.411 (variable) 71.10 29(Aperture) ∞ 4.65 32.99 30 -210.171 1.40 1.76200 40.1 30.42 31 32.511 1.47 28.94 32 32.252 4.11 1.85478 24.8 29.38 33 88.149 3.57 28.82 34 -118.148 1.70 1.88300 40.8 28.33 35 -886.069 5.00 28.20 36 ∞ 22.78 1.83481 42.7 27.56 37 ∞ 1.47 26.01 38 2923.548 3.00 2.00100 29.1 25.83 39 66.737 5.13 25.55 40 -91.772 1.50 1.88300 40.8 26.33 41 27.792 8.52 1.84666 23.8 28.05 42 -48.572 0.20 28.83 43 -112.891 7.36 1.43875 94.7 28.89 44 -35.781 0.20 29.44 45 -57.602 7.77 1.81600 46.6 29.06 46 -21.928 1.50 2.00100 29.1 29.46 47 -89.003 8.62 30.93 48 5803.979 1.40 1.83481 42.7 32.43 49 40.794 6.30 1.80518 25.4 32.81 50 739.961 0.28 33.09 51 75.363 8.97 1.48749 70.2 33.50 52 -36.256 1.62 2.00100 29.1 33.47 53 -72.576 0.99 34.49 54 -107.539 5.83 1.60562 43.7 34.79 55 -38.578 0.22 35.47 56 121.255 7.76 1.64000 60.1 34.01 57 -36.617 1.62 2.00100 29.1 33.33 58 -93.681 9.30 33.24 59 ∞ 33.00 1.60859 46.4 60.00 60 ∞ 13.20 1.51633 64.2 60.00 61 ∞ (variable) 60.00 Image plane ∞ Aspheric Data Page 11 K = 0.00000e+000 A 4= 2.28615e-006 A 6=-1.38289e-009 A 8= 7.22628e-012 A10=-4.35752e-014 A12= 1.34169e-016 A14=-1.96183e-019 A16= 1.10092e-022 Page 17 K = 0.00000e+000 A 4=-1.76959e-007 A 6=-1.58573e-010 A 8= 2.80712e-013 A10=-2.98755e-017 A12=-3.73787e-018 A14= 9.74883e-021 A16=-7.35536e-024 Page 19 K = 0.00000e+000 A 4= 2.97276e-007 A 6= 2.55441e-012 A 8=-7.60558e-015 A10= 3.19715e-017 A12=-3.61423e-020 A14= 1.79078e-023 A16=-3.33963e-027 Page 27 K = 0.00000e+000 A 4=-3.10347e-007 A 6= 2.06311e-011 A 8=-2.66872e-013 A10= 9.66509e-016 A12=-3.30933e-018 A14=-2.42884e-021 A16= 2.13705e-026 A13= 1.43782e-019 A15= 1.37717e-023 Various data Zoom ratio 100.00 Wide Angle Mid-Telephoto Focal length 8.20 100.00 820.00 F-number 1.75 1.75 4.30 Half angle of view 33.85 3.15 0.38 Image height 5.50 5.50 5.50 Lens total length 696.19 696.19 696.19 BF 51.28 51.28 51.28 d10 4.14 158.05 192.85 d15 1.71 4.89 1.49 d17 287.83 93.94 3.22 d23 3.91 6.06 10.25 d28 2.99 37.63 92.77 d61 12.80 12.80 12.80 Entrance pupil position 129.39 1177.73 10887.10 Exit pupil position 83.56 83.56 83.56 Front principal point position 138.54 1419.06 21209.93 Back principal point position 4.60 -87.20 -807.20 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 248.63 123.21 70.92 -18.50 2 11 -81.40 28.47 -24.10 -66.55 3 16 -62.84 2.00 -0.59 -1.71 4 18 126.42 38.99 -2.87 -29.45 5 24 119.42 26.76 8.09 -11.00 6 29 31.04 180.42 56.40 14.55 Single lens data Lens starting surface focal length 1 1 -361.06 2 3 440.41 3 5 733.28 4 7 551.07 5 9 868.22 6 11 -30.71 7 13 -29.60 8 14 26.37 9 16 -62.84 10 18 151.15 11 20 156.18 12 22 -176.50 13 24 160.36 14 25 -281.51 15 27 168.69 16 30 -36.64 17 32 57.00 18 34 -153.65 19 36 0.00 20 38 -67.72 21 40 -23.88 22 41 21.79 23 43 115.72 24 45 39.31 25 46 -29.16 26 48 -48.94 27 49 52.91 28 51 51.40 29 52 -73.44 30 54 95.74 31 56 44.63 32 57 -60.43 33 59 0.00 34 60 0.00 (Numerical Example 4) Unit: mm Surface Data Surface number rd nd νd Effective diameter 1 -2942.188 6.00 1.83481 42.7 212.06 2 335.459 1.80 200.18 3 335.066 23.71 1.43387 95.1 199.56 4 -1057.929 0.20 198.21 5 525.299 14.68 1.43387 95.1 200.37 6 -2449.905 25.25 200.48 7 377.042 20.53 1.43387 95.1 201.11 8 -1365.497 0.25 200.62 9 306.954 16.16 1.43387 95.1 194.85 10 1716.232 1.50 193.64 11 188.244 16.19 1.43875 94.7 181.77 12 408.078 (variable) 179.80 13* -532.824 2.20 2.00330 28.3 45.15 14 38.132 11.72 38.75 15 -44.546 1.45 1.74320 49.3 37.57 16 72.565 9.77 1.89286 20.4 39.69 17 -46.484 1.63 40.65 18 -41.758 2.00 1.88300 40.8 40.58 19 -152.608 (variable) 43.27 20 152.336 11.49 1.72916 54.7 83.61 21* -265.715 6.62 83.89 22 139.888 13.50 1.43875 94.7 84.25 23 -246.304 0.50 83.64 24 264.094 2.60 1.85478 24.8 80.65 25 97.106 (variable) 77.84 26 86.506 15.39 1.49700 81.5 78.13 27 -236.969 0.50 77.29 28 415.877 2.50 1.80518 25.4 73.89 29 139.362 7.85 1.60311 60.6 71.54 30* -764.201 (variable) 70.33 31(Aperture) ∞ 5.46 34.13 32 -100.588 1.40 1.88300 40.8 31.36 33 50.285 1.36 30.49 34 40.817 3.60 1.92286 18.9 30.97 35 96.042 4.19 30.49 36 -79.866 1.70 1.80400 46.5 30.15 37 -114.439 5.00 30.25 38 ∞ 12.83 1.83481 42.7 29.46 39∞1.71 28.56 40 221.698 2.52 1.92286 18.9 28.29 41 -1244.866 1.00 2.00100 29.1 28.03 42 53.392 5.24 27.68 43 -237.909 1.50 1.88300 40.8 28.58 44 43.660 6.33 1.84666 23.8 29.56 45 -84.502 0.20 30.12 46 -1491.299 6.24 1.43875 94.7 30.31 47 -30.971 0.20 30.53 48 -54.336 8.44 1.81600 46.6 29.69 49 -20.364 1.50 2.00100 29.1 29.89 50 -103.904 12.26 31.51 51 -300.428 1.40 1.83481 42.7 33.69 52 53.789 6.63 1.80518 25.4 34.35 53 -204.517 0.28 34.83 54 162.773 6.86 1.48749 70.2 35.11 55 -54.586 1.62 2.00100 29.1 35.18 56 -77.702 0.99 35.65 57 -116.855 5.47 1.60562 43.7 35.49 58 -43.241 0.22 35.67 59 98.690 7.33 1.64000 60.1 33.85 60 -42.889 1.62 2.00100 29.1 33.01 61 -169.312 9.98 32.59 62∞ 33.00 1.60859 46.4 60.00 63 ∞ 13.20 1.51633 64.2 60.00 64 ∞ (variable) 60.00 Image plane ∞ Aspheric Data Page 13 K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400e-022 A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020 Page 21 K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16=-4.73901e-027 A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025 Page 30 K =-2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026 A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025 Various data Zoom ratio 120.00 Wide Angle Mid-Telephoto Focal length 8.50 99.95 1019.45 F-number 1.75 1.75 5.25 Half angle of view 32.92 3.15 0.31 Image height 5.50 5.50 5.50 Lens total length 683.03 683.03 683.03 BF 51.95 51.95 51.95 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d64 12.80 12.80 12.80 Entrance pupil position 133.62 1087.78 14063.25 Exit pupil position 112.91 112.91 112.91 Front principal point position 142.84 1287.50 25463.85 Back principal point position 4.30 -87.15 -1006.65 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 251.50 126.27 72.69 -19.27 2 13 -24.07 28.78 3.62 -16.98 3 20 134.62 34.71 -5.03 -27.55 4 26 112.37 26.24 4.27 -13.07 5 31 36.28 171.26 58.13 16.42 Single lens data Lens starting surface focal length 1 1 -358.42 2 3 588.08 3 5 995.95 4 7 681.71 5 9 856.44 6 11 776.95 7 13 -35.11 8 15 -36.77 9 16 32.64 10 18 -65.28 11 20 133.77 12 22 205.02 13 24 -179.27 14 26 129.18 15 28 -258.97 16 29 195.31 17 32 -37.58 18 34 73.66 19 36 -334.48 20 38 0.00 21 40 201.59 22 41 -50.71 23 43 -41.43 24 44 34.45 25 46 71.81 26 48 35.72 27 49 -25.33 28 51 -54.25 29 52 53.02 30 54 84.44 31 55 -188.47 32 57 109.64 33 59 47.49 34 60 -57.29 35 62 0.00 36 63 0.00 (Numerical Example 5) Unit: mm Surface Data Surface number rd nd νd Effective diameter 1 -2942.188 6.00 1.83481 42.7 212.06 2 335.459 1.80 200.18 3 335.066 23.71 1.43387 95.1 199.56 4 -1057.929 0.20 198.21 5 525.299 14.68 1.43387 95.1 200.37 6 -2449.905 25.25 200.48 7 377.042 20.53 1.43387 95.1 201.11 8 -1365.497 0.25 200.62 9 306.954 16.16 1.43387 95.1 194.85 10 1716.232 1.50 193.64 11 188.244 16.19 1.43875 94.7 181.77 12 408.078 (variable) 179.80 13* -532.824 2.20 2.00330 28.3 45.15 14 38.132 11.72 38.75 15 -44.546 1.45 1.74320 49.3 37.57 16 72.565 9.77 1.89286 20.4 39.69 17 -46.484 1.63 40.65 18 -41.758 2.00 1.88300 40.8 40.58 19 -152.608 (variable) 43.27 20 152.336 11.49 1.72916 54.7 83.61 21* -265.715 6.62 83.89 22 139.888 13.50 1.43875 94.7 84.25 23 -246.304 0.50 83.64 24 264.094 2.60 1.85478 24.8 80.65 25 97.106 (variable) 77.84 26 86.506 15.39 1.49700 81.5 78.13 27 -236.969 0.50 77.29 28 415.877 2.50 1.80518 25.4 73.89 29 139.362 7.85 1.60311 60.6 71.54 30* -764.201 (variable) 70.33 31(Aperture) ∞ 5.46 34.13 32 -100.588 1.40 1.88300 40.8 31.36 33 50.285 1.36 30.49 34 40.817 3.60 1.92286 18.9 30.97 35 96.042 4.19 30.49 36 -79.866 1.70 1.80400 46.5 30.15 37 -114.439 5.00 30.25 38 ∞ 17.45 1.83481 42.7 29.60 39 ∞ 1.49 28.38 40 138.147 2.00 2.00100 29.1 28.10 41 69.339 6.23 27.65 42 -52.879 1.50 1.88300 40.8 27.87 43 105.813 9.17 1.84666 23.8 29.16 44 -49.861 0.20 30.90 45 -102.728 4.96 1.43875 94.7 30.92 46 -33.445 0.20 31.16 47 -93.066 8.35 1.81600 46.6 30.23 48 -23.245 1.50 2.00100 29.1 30.11 49 -214.403 9.29 30.95 50 -316.247 1.40 1.83481 42.7 32.05 51 41.714 7.41 1.80518 25.4 32.61 52 -134.642 0.28 33.00 53 200.858 7.64 1.48749 70.2 33.05 54 -36.339 1.62 2.00100 29.1 33.05 55 -115.022 0.99 34.42 56 282.811 6.90 1.60562 43.7 35.39 57 -49.802 0.22 35.87 58 89.583 6.42 1.64000 60.1 34.74 59 -65.654 1.62 2.00100 29.1 34.03 60 -213.542 10.14 33.62 61∞ 33.00 1.60859 46.4 60.00 62 ∞ 13.20 1.51633 64.2 60.00 63 ∞ (variable) 60.00 Image plane ∞ Aspheric Data Page 13 K = 1.99852e+000 A 4= 1.15677e-006 A 6=-2.75064e-008 A 8=-3.06848e-010 A10= 9.10515e-013 A12= 3.28486e-015 A14= 1.35261e-018 A16= 5.54400e-022 A 3= 2.74335e-007 A 5= 9.95673e-008 A 7= 4.02226e-009 A 9= 6.12079e-012 A11=-8.52506e-014 A13=-6.85632e-017 A15=-3.84859e-020 Page 21 K = 1.21093e+001 A 4= 2.82183e-007 A 6=-5.59441e-011 A 8=-2.00796e-014 A10= 9.78964e-017 A12=-6.30815e-020 A14= 1.70834e-023 A16=-4.73901e-027 A 3=-2.90901e-008 A 5= 1.58196e-009 A 7= 1.10620e-012 A 9=-1.50730e-015 A11= 5.86871e-020 A13= 1.04584e-022 A15= 1.44467e-025 Page 30 K =-2.23400e+002 A 4= 2.77687e-007 A 6= 4.69555e-010 A 8= 1.39733e-013 A10=-2.98156e-016 A12= 4.58582e-019 A14=-2.25443e-022 A16= 5.80568e-026 A 3= 1.70768e-007 A 5=-5.73181e-009 A 7=-1.36230e-011 A 9= 7.92918e-015 A11=-8.14405e-018 A13= 2.06016e-021 A15=-8.57551e-025 Various data Zoom ratio 120.00 Wide Angle Mid-Telephoto Focal length 8.53 100.40 1024.13 F-number 1.76 1.76 5.27 Half angle of view 32.80 3.14 0.31 Image height 5.50 5.50 5.50 Lens total length 687.65 687.65 687.65 BF 52.11 52.11 52.11 d12 3.47 154.53 194.08 d19 289.33 96.92 2.00 d25 4.21 10.30 4.50 d30 2.99 38.24 99.42 d63 12.80 12.80 12.80 Entrance pupil position 133.62 1087.78 14063.25 Exit pupil position 102.51 102.51 102.51 Front principal point position 142.97 1300.55 26777.98 Back principal point position 4.26 -87.61 -1011.33 Zoom lens group data Group Starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 251.50 126.27 72.69 -19.27 2 13 -24.07 28.78 3.62 -16.98 3 20 134.62 34.71 -5.03 -27.55 4 26 112.37 26.24 4.27 -13.07 5 31 34.70 175.88 58.13 16.43 Single lens data Lens starting surface focal length 1 1 -358.42 2 3 588.08 3 5 995.95 4 7 681.71 5 9 856.44 6 11 776.95 7 13 -35.11 8 15 -36.77 9 16 32.64 10 18 -65.28 11 20 133.77 12 22 205.02 13 24 -179.27 14 26 129.18 15 28 -258.97 16 29 195.31 17 32 -37.58 18 34 73.66 19 36 -334.48 20 38 0.00 21 40 -140.00 22 42 -39.52 23 43 40.74 24 45 110.33 25 47 35.85 26 48 -25.94 27 50 -43.82 28 51 39.94 29 53 63.58 30 54 -53.19 31 56 70.09 32 58 59.93 33 59 -94.46 34 61 0.00 35 62 0.00

[0046] [Table 1]

[0047] (Imaging device) Here, FIG. 12 is a diagram showing a configuration example of an imaging device (broadcast camera) 100. In the figure, 101 is a zoom lens of any one of the first to fifth embodiments. 124 is a camera (imaging device) body. The zoom lens 101 is detachable from the camera body 124. 125 is an imaging device configured by mounting the zoom lens 101 to the camera body 124. The zoom lens 101 has a first lens group F, two or more lens groups LZ for varying magnification, and a rear lens group R for imaging. The first lens group F includes, but is not limited to, a second subgroup 1b that moves on the optical axis for focusing, and a first subgroup 1a and a third subgroup 1c that do not move for focusing.

[0048] The two or more lens groups LZ for varying the magnification move on the optical axis for varying the magnification. SP is an aperture stop. The rear lens group R may have a subgroup that can be inserted into or removed from the optical path. The focal length range of the zoom lens 101 can be changed by inserting or removing the subgroup. 114 and 115 are drive mechanisms for driving the second subgroup 1b and the two or more lens groups for varying the magnification in the optical axis direction, respectively. The drive mechanisms can be configured to include a helicoid, a cam, or the like. 116, 117, and 118 are motors (drive units) for driving the drive mechanisms 114 and 115 and the aperture stop SP, respectively. 119, 120, and 121 are detection units for detecting the position on the optical axis of the second subgroup 1b, the position on the optical axis of the two or more lens groups for varying the magnification, and the aperture diameter of the aperture stop SP, respectively. The detection units can be configured to include an encoder, a potentiometer, a photosensor, or the like. In the camera body 124, reference numeral 109 denotes a glass block including an optical filter and the like, and 110 denotes an imaging element (photoelectric conversion element) that captures a subject image formed by the zoom lens 101. The imaging element can be configured to include a CCD or CMOS sensor and the like. Reference numerals 111 and 122 respectively denote a CPU serving as a processing unit (control unit) in the camera body 124 and a CPU serving as a processing unit (control unit) in the zoom lens 101. In this way, by mounting the zoom lens according to this embodiment on the camera body, it is possible to provide a useful imaging device including the zoom lens having the above-mentioned advantageous effects.

[0049] According to each embodiment, for example, it is possible to provide a zoom lens and an image pickup apparatus that are advantageous in terms of optical characteristics and compact size.

[0050] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention.

[0051] For example, in each embodiment, the second section may have a variator group having negative refractive power that moves from the object side to the image side for zooming, and a compensator group having positive refractive power that moves to correct image plane fluctuations associated with zooming. [Explanation of symbols]

[0052] L1 First lens group (first part) L2 Second lens group (second section) L3 Third lens group (second section) L4 4th lens group (2nd section, imaging section) L5 Fifth lens group (Second section, imaging section) L6 6th lens group (imaging section) L4PR, L5PR, L6PR Prism (splitting element) L4N, L5N, L6N lens group L4IE, L5IE, L6IE lens family L4R, L5R, L6R lens group SP Aperture ZL Zoom Lens

Claims

1. A zoom lens including, in order from the object side to the image side, a first lens group including a focusing group that moves for focusing, an intermediate group composed of two or more variable power lens groups that move for varying magnification, an aperture stop, and a rear lens group that does not move for varying magnification, and in which the spacing between adjacent lens groups changes during zooming, The rear lens group, in order from the object side to the image side, is A branching element that branches the light beam into reflected light and transmitted light; a negative group having negative refractive power; a focal length changing group that can be inserted into and removed from an optical path to change the focal length of the zoom lens; and a positive group having positive refractive power.

2. The distance from the aperture to the transmission exit surface of the splitting element is dP, the distance from the aperture to the image plane of the zoom lens is dT, the effective diameter of the light beam at the transmission exit surface of the splitting element is DB, the effective diameter of the light beam at the branch exit surface of the splitting element is DC, and the total thickness of the focal length changing group is dIE. 0.00<dP / dT<0.40 0.25<DC / DB<0.77 0.00<dIE / (dT-dP)<0.40 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

3. The angle between the reflecting surface that splits the light beam in the splitting element and the optical axis is θr (degrees), 53<θr<67 3. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. Let fn be the focal length of the negative group and fp be the focal length of the positive group, -4<fn / fp<-1 4. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. 5. The zoom lens according to claim 1, wherein the first lens group has a positive refractive power.

6. The intermediate group is a variator lens group having negative refractive power that moves from the object side to the image side for varying magnification; 6. The zoom lens according to claim 1, further comprising a compensator lens group having a positive refractive power that moves to correct image plane fluctuations that occur with magnification changes.

7. 6. The zoom lens according to claim 1, wherein the intermediate group consists of, in order from the object side to the image side, a negative lens group, a positive lens group, and a positive lens group.

8. 6. The zoom lens according to claim 1, wherein the intermediate lens group comprises, in order from the object side to the image side, a negative lens group and a positive lens group.

9. 6. The zoom lens according to claim 1, wherein the intermediate group consists of, arranged in order from the object side to the image side, a negative lens group, a positive lens group, a positive lens group, and a positive lens group.

10. A zoom lens according to any one of claims 1 to 9; and an image sensor for capturing an image formed by the zoom lens.

Images