Zoom lens and image capturing device having the same

Abstract

To provide a compact, wide-angle zoom lens which offers high optical performance.SOLUTION: A zoom lens is provided, comprising a first lens group with positive refractive power configured to be stationery for zooming, an intermediate group with two or more lens groups configured to move for zooming, and a rear lens group with positive refractive power configured to move for zooming, arranged in order from the object side to the image side, and being configured such that distances between adjacent lens groups change while zooming. The intermediate group includes a zooming group consisting of one or more lens groups configured to simply move toward the image side while zooming from the wide-angle end to the telephoto end and having an appropriately set configuration.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a zoom lens, which is suitable for use in imaging devices such as digital video cameras, digital still cameras, broadcast cameras, and surveillance cameras. [Background technology]

[0002] Zoom lenses used in imaging devices such as television cameras, movie cameras, broadcast cameras, and video cameras are required to be small and lightweight, have a wide angle of view, a high zoom ratio, and high optical performance. In addition, with the use of imaging elements compatible with high resolutions such as 4K and 8K, the optical image they form must have high resolution from the center to the periphery and little chromatic aberration.

[0003] A positive-lead zoom lens is known as a zoom lens with a wide angle of view and a high zoom ratio, in which, from the object side to the image side, a first lens group with positive refractive power and a second lens group with negative refractive power that moves for zooming are arranged. Patent Document 1 discloses a zoom lens that includes, from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, multiple lens groups that move for zooming, and a lens group with positive refractive power that does not move for zooming. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-106577 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the zoom lens of Patent Document 1, if an attempt is made to achieve a wider angle of view or a higher zoom ratio, this may be disadvantageous in terms of optical performance and size reduction.

[0006] An object of the present invention is to provide a small, lightweight zoom lens having a wide angle of view, a high zoom ratio and high optical performance. [Means for solving the problem]

[0007] A zoom lens of the present invention has, arranged in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, an intermediate group including two or more lens groups that move for zooming, and a rear lens group having positive refractive power that does not move for zooming, and the distance between adjacent lens groups changes during zooming, the intermediate group has a magnification group made up of one or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, and the magnification group is composed of five lenses including a cemented lens in which three lenses are cemented together, and when the average value of the refractive index at the d-line of the material of the negative lens included in the magnification group is Ndn_ave and the average value of the Abbe number based on the d-line of the material of the negative lens included in the magnification group is νdn_ave, 1.70 <Ndn_ave<2.10 20.0<νdn_ave<40.0 The present invention is characterized in that the following conditional expression is satisfied: Effect of the Invention

[0008] According to the present invention, it is possible to obtain a small and lightweight zoom lens having a wide angle of view, a high zoom ratio and high optical performance. [Brief description of the drawings]

[0009] [Figure 1] 1 is a lens cross-sectional view of a zoom lens of a first embodiment at a wide-angle end. [Diagram 2] 4A and 4B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 1. [Diagram 3] FIG. 11 is a lens cross-sectional view of a zoom lens of a second embodiment at a wide-angle end. [Figure 4] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 2. [Diagram 5] FIG. 11 is a lens cross-sectional view of a zoom lens of a third embodiment at a wide-angle end. [Figure 6] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 3. [Figure 7] FIG. 11 is a lens cross-sectional view of a zoom lens of Example 4 at the wide-angle end. [Figure 8] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 4. [Figure 9] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 5 at the wide-angle end. [Figure 10] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 5. [Figure 11] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 6 at the wide-angle end. [Figure 12] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 6. [Figure 13] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 7 at the wide-angle end. [Figure 14] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 7. [Figure 15] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 8 at the wide-angle end. [Figure 16] 13A and 13B are aberration diagrams at the wide-angle end and the telephoto end of the zoom lens of Example 8. [Figure 17] FIG. 2 is a configuration diagram of an imaging device in each embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a zoom lens and an image pickup apparatus having the same according to the present invention will be described in detail with reference to the accompanying drawings.

[0011] 1, 3, 5, 7, 9, 11, 13, and 15 are cross-sectional views of the zoom lenses of Examples 1 to 8 at the wide-angle end and focused at infinity. The zoom lenses of the respective Examples are used in imaging devices such as digital video cameras, digital still cameras, broadcast cameras, cameras for silver halide film, surveillance cameras, and vehicle-mounted cameras.

[0012] In each lens cross-sectional view, the left side is the object side and the right side is the image side. The zoom lens of each embodiment may be used as a projection lens for a projector, etc. In this case, the left side is the screen side and the right side is the projected image side.

[0013] The zoom lens of each embodiment has, arranged in order from the object side to the image side, a first lens group L1 with positive refractive power that does not move for zooming, a middle group M including two or more lens groups that move for zooming, and a rear lens group LR with positive refractive power that does not move for zooming. The lens group is a group of one or more lenses that move as a unit during zooming from the wide-angle end to the telephoto end. In other words, the distance between adjacent lens groups changes during zooming.

[0014] The intermediate group M has a variable magnification group V consisting of one or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end. The variable magnification group V consists of five lenses including a cemented lens in which three lenses are cemented together.

[0015] The arrows in each lens cross-sectional diagram show the movement trajectory of each lens group during zooming from the wide-angle end to the telephoto end. The wide-angle end and telephoto end respectively indicate the maximum angle of view (shortest focal length) and minimum angle of view (maximum focal length) zoom states when the lens group that moves during zooming is located at the two ends of the range that it can move mechanically or controllably on the optical axis.

[0016] In each lens cross-sectional view, SP is an aperture stop. P is an optical block equivalent to an optical filter, face plate, low-pass filter, infrared cut filter, etc. IP is an image plane, and when the zoom lens of each embodiment is used for a surveillance camera or broadcast camera, the imaging surface of a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor is disposed thereon. When the zoom lens of each embodiment is used as the photographing optical system of a silver halide film camera, a photosensitive surface equivalent to the film surface is disposed on the image plane IP.

[0017] 2(A), 4(A), 6(A), 8(A), 10(A), 12(A), 14(A) and 16(A) are aberration diagrams of the zoom lenses of Examples 1 to 8 when focused on an object distance of infinity at the wide-angle end. 2(B), 4(B), 6(B), 8(B), 10(B), 12(B), 14(B) and 16(B) are aberration diagrams of the zoom lenses of Examples 1 to 8 when focused on an object distance of infinity at the telephoto end.

[0018] The spherical aberration diagrams show the spherical aberration at the d-line (wavelength 587.6 nm), g-line (wavelength 435.8 nm), C-line (wavelength 656.3 nm), and F-line (wavelength 486.1 nm) using a solid line, a two-dot chain line, a one-dot chain line, and a dashed line, respectively. The astigmatism diagrams show the astigmatism at the meridional image plane and the sagittal image plane using a dashed line and a solid line, respectively. The distortion diagrams show the distortion at the e-line. The chromatic aberration diagrams show the lateral chromatic aberration at the e-line, g-line, C-line, and F-line using a solid line, a two-dot chain line, a one-dot chain line, and a dashed line, respectively. Fno represents the F-number, and ω represents the half angle of view (°). The full scale of the horizontal axis of the spherical aberration diagram is ±0.200 mm, and the full scale of the horizontal axis of the astigmatism diagram is also ±0.200 mm. The full scale of the horizontal axis of the distortion diagram is ±5.000%. The full scale of the horizontal axis of the chromatic aberration diagram is ±0.050mm. ω is the half angle of view (°).

[0019] Next, the characteristic configuration of the zoom lens of each embodiment will be described. In each embodiment, the magnification variable group V is composed of five lenses, including a cemented lens in which three lenses are cemented together. By disposing a cemented lens in which three lenses are cemented together in the magnification variable group V, lateral chromatic aberration is effectively corrected. In addition, by cementing three lenses together, the number of lens surfaces in contact with air can be reduced, and as a result, the occurrence of various aberrations due to manufacturing errors of the lens surfaces can be effectively reduced.

[0020] In the zoom lenses of Examples 1 to 7, the magnification group V is composed of a first negative lens, a second negative lens, a first positive lens, a third negative lens, and a second positive lens, arranged in this order from the object side to the image side. In addition, the second negative lens, the first positive lens, and the third negative lens form a cemented lens. By arranging more negative lenses on the object side in the magnification group V, it is possible to shorten the distance between the first lens group L1 and the magnification group V while strengthening the refractive power of the magnification group. As a result, both high magnification and compactness are achieved.

[0021] In the zoom lens of Example 8, the magnification variable group V is composed of, in order from the object side to the image side, a first positive lens, a first negative lens, a second negative lens, a second positive lens, and a third negative lens. The second negative lens, the second positive lens, and the third negative lens form a cemented lens.

[0022] Moreover, the zoom lens of each embodiment is configured to satisfy the following conditional expressions. 1.70 <Ndn_ave<2.10···(1) 20.0<νdn_ave<40.0 (2)

[0023] Here, the average value of the refractive index at the d-line of the material of the negative lens included in the magnification varying group V is defined as Ndn_ave, and the average value of the Abbe number based on the d-line of the material of the negative lens included in the magnification varying group V is defined as νd=(Nd-1) / (NF-NC), where NF, Nd and NC are the refractive indices at the F-line (wavelength 486.1 nm), d-line (wavelength 587.6 nm) and C-line (wavelength 656.3 nm), respectively.

[0024] Conditional formula (1) specifies the average value Ndn_ave of the refractive index at the d-line of the material of the negative lens included in the variable magnification group V. If the upper limit of conditional formula (1) is exceeded, the refractive index of the negative lens included in the variable magnification group V becomes too large, which is undesirable as it causes large fluctuations in optical performance such as curvature of field and coma aberration during zooming. If the lower limit of conditional formula (1) is exceeded, the refractive index of the negative lens included in the variable magnification group V becomes too small, which increases the amount of movement of the variable magnification group V during zooming, which is undesirable as it makes it difficult to achieve both a compact zoom lens and high magnification.

[0025] Conditional formula (2) specifies the average value νdn_ave of the Abbe number based on the d-line of the material of the negative lens included in the magnification variable group V. If the upper limit of conditional formula (2) is exceeded, the Abbe number based on the d-line of the material of the negative lens included in the magnification variable group V becomes too large, which is undesirable as it becomes difficult to satisfactorily correct axial chromatic aberration at the wide-angle end. If the lower limit of conditional formula (2) is exceeded, the Abbe number based on the d-line of the material of the negative lens included in the magnification variable group V becomes too small, which is undesirable as it becomes difficult to satisfactorily correct lateral chromatic aberration at the wide-angle end.

[0026] With the above configuration, it is possible to realize a small, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance.

[0027] In each embodiment, it is preferable to set the numerical ranges of conditional expressions (1) and (2) as follows: 1.80 <Ndn_ave<2.00···(1a) 25.0<νdn_ave<37.0···(2a)

[0028] Furthermore, it is preferable that the zoom lens of each embodiment satisfies one or more of the following conditional expressions. 0.5<(R2+R1) / (R2-R1)<3.5...(3) 1.70 <Ndp_ave<2.10···(4) 15.0<νdp_ave<40.0 (5) 0.1<|mv| / Td<0.4 (6) -0.50 <fv / ft<-0.01···(7) -1.0 <fv / f1<-0.05···(8) 0.1<(βvt / βvw) / Zwt<3.0 (9)

[0029] Here, the radius of curvature of the lens surface on the object side of the negative lens arranged closest to the image among the cemented lenses constituting the magnification group V is R1, the radius of curvature of the lens surface on the image side is R2, and the average value of the refractive index at the d-line of the material of the positive lenses included in the magnification group V is Ndp_ave. The average value of the Abbe number based on the d-line of the material of the positive lenses included in the magnification group V is νdp_ave, and the movement amount of the lens group that moves the largest amount during zooming from the wide-angle end to the telephoto end among the lens groups included in the intermediate group M is mv. The distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image side of the zoom lens at the wide-angle end is Td, the focal length of the magnification group V at the wide-angle end is fv, and the focal length of the zoom lens at the telephoto end is ft. The focal length of the first lens group L1 is f1, the lateral magnifications of the magnification group V at the wide-angle end and the telephoto end are βvw and βvt, respectively, and the zoom ratio of the zoom lens is Zwt. The amount of movement of the lens group is a value indicating the difference between the position of the lens group on the optical axis at the wide-angle end and the position of the lens group on the optical axis at the telephoto end.

[0030] The technical meaning of each conditional expression will be explained below. Conditional expression (3) specifies the shape factor of the negative lens located closest to the image among the cemented lenses constituting the magnification varying group V. Exceeding the upper limit of conditional expression (3) is undesirable since aberrations such as field curvature occur in large amounts at the wide-angle end. Falling below the lower limit of conditional expression (3) is undesirable since aberrations such as field curvature occur in large amounts at the telephoto end.

[0031] Conditional formula (4) specifies the average value Ndp_ave of the refractive index at the d-line of the material of the positive lens included in the magnification group V. If the upper limit of conditional formula (4) is exceeded, the refractive index of the positive lens included in the magnification group V becomes too large, which is undesirable as it causes a lot of curvature of field at the wide-angle end. If the lower limit of conditional formula (4) is exceeded, the refractive index of the positive lens included in the magnification group V becomes too small, which is undesirable as it causes a lot of spherical aberration at the wide-angle end.

[0032] Conditional formula (5) specifies the average value νdp_ave of the Abbe number based on the d-line of the material of the positive lens included in the magnification variable group V. If the upper limit of conditional formula (5) is exceeded, the average value νdp_ave of the Abbe number based on the d-line of the material of the positive lens included in the magnification variable group V becomes too large, which is undesirable because it becomes difficult to satisfactorily correct the axial chromatic aberration at the wide-angle end. If the lower limit of conditional formula (5) is exceeded, the average value νdp_ave of the Abbe number based on the d-line of the material of the positive lens included in the magnification variable group V becomes too small, which is undesirable because it becomes difficult to satisfactorily correct the lateral chromatic aberration at the wide-angle end.

[0033] Conditional formula (6) is a conditional formula that specifies the ratio between the amount of movement mv of the lens group that moves the largest amount of movement during zooming from the wide-angle end to the telephoto end and the distance Td on the optical axis at the wide-angle end from the lens surface closest to the object side to the lens surface closest to the image side of the zoom lens. If the upper limit of conditional formula (6) is exceeded, the amount of movement mv becomes too large, and in order to reduce the size of the zoom lens, it becomes necessary to relatively thin the thickness of the lens groups other than the lens group that moves the largest amount of movement. As a result, it becomes difficult to satisfactorily correct various aberrations, which is undesirable. If the lower limit of conditional formula (6) is exceeded, the amount of movement mv becomes too small, which makes it difficult to sufficiently increase the magnification of the zoom lens, which is undesirable.

[0034] Conditional formula (7) specifies the ratio between the focal length fv of the variable magnification group V at the wide-angle end and the focal length ft of the zoom lens at the telephoto end. If the upper limit of conditional formula (7) is exceeded, the focal length fv of the variable magnification group V at the wide-angle end becomes too short, which is undesirable as it increases the fluctuation of optical performance such as curvature of field and coma aberration during zooming. If the lower limit of conditional formula (7) is exceeded, the focal length fv of the variable magnification group V at the wide-angle end becomes too long, which is undesirable as it becomes difficult to achieve a sufficiently high magnification of the zoom lens.

[0035] Conditional formula (8) specifies the ratio between the focal length fv of the variable magnification group V at the wide-angle end and the focal length f1 of the first lens group L1. If the upper limit of conditional formula (8) is exceeded, the focal length fv of the variable magnification group V at the wide-angle end becomes too short, which is undesirable as it increases the fluctuation in optical performance such as field curvature and coma aberration during zooming. If the lower limit of conditional formula (8) is exceeded, the focal length fv of the variable magnification group V at the wide-angle end becomes too long, which is undesirable as it becomes difficult to achieve a sufficiently high magnification of the zoom lens.

[0036] Conditional formula (9) defines the magnification sharing of the magnification group V. If the upper limit of conditional formula (9) is exceeded, the magnification sharing of the magnification group V becomes too large, which undesirably leads to large fluctuations in various aberrations accompanying the movement of the magnification group V. If the lower limit of conditional formula (9) is exceeded, the magnification sharing of the magnification group V becomes too small, which undesirably leads to an increase in the magnification sharing of the lens group arranged on the image side of the magnification group V, which undesirably leads to an increase in various aberrations.

[0037] It is preferable to set the numerical ranges of the conditional expressions (3) to (9) as follows: 1.0<(R2+R1) / (R2-R1)<2.5...(3a) 1.75 <Ndp_ave<1.90···(4a) 20.0<νdp_ave<30.0 (5a) 0.2<|mv| / Td<0.3 (6a) -0.40 <fv / ft<-0.05···(7a) -0.5 <fv / f1<-0.10···(8a) 0.5<(βvt / βvw) / Zwt<1.5 (9a)

[0038] Next, the detailed configuration of the zoom lens of each embodiment will be described.

[0039] [Example 1] The zoom lens of the first embodiment is composed of a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with positive refractive power, and a fifth lens group L5 (rear lens group LR) with positive refractive power, which are arranged in this order from the object side to the image side. 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 monotonically from the object side to the image side, and the third lens group L3 and the fourth lens group L4 move. An aperture stop SP is arranged between the fourth lens group L4 and the fifth lens group L5. The intermediate group M is composed of the second lens group L2 with negative refractive power, the third lens group L3 with negative refractive power, and the fourth lens group L4 with positive refractive power, and the magnification group V is composed of the second lens group L2.

[0040] [Example 2] The zoom lens of the second embodiment includes a first lens group L1 with positive refractive power, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with negative refractive power, which are arranged in this order from the object side to the image side. Furthermore, a fifth lens group L5 with positive refractive power and a sixth lens group L6 (rear lens group LR) with positive refractive power are arranged on the image side of the fourth lens group L4. During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the sixth lens group L6 are stationary, the second lens group L2 and the third lens group L3 move monotonically from the object side to the image side, and the fourth lens group L4 and the fifth lens group L5 move. An aperture stop SP is arranged between the fifth lens group L5 and the sixth lens group L6. The intermediate group M is composed of a second lens group L2 having negative refractive power, a third lens group L3 having negative refractive power, a fourth lens group L4 having negative refractive power, and a fifth lens group L5 having positive refractive power, and the magnification varying group V is composed of the second lens group L2 and the third lens group L3.

[0041] [Examples 3, 5, 6, and 7] The configurations of the zoom lenses in the third, fifth, sixth and seventh embodiments are the same as the configuration of the zoom lens in the first embodiment.

[0042] [Example 4] The zoom lens of the fourth embodiment is composed of 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, and a fifth lens group L5 (rear lens group LR) with positive refractive power, which are arranged in this order from the object side to the image side. 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 monotonically from the object side to the image side, and the third lens group L3 and the fourth lens group L4 move. An aperture stop SP is arranged between the fourth lens group L4 and the fifth lens group L5. The intermediate group M is composed of the second lens group L2 with negative refractive power, the third lens group L3 with positive refractive power, and the fourth lens group L4 with positive refractive power, and the magnification group V is composed of the second lens group L2.

[0043] [Example 8] The zoom lens of the eighth embodiment includes a first lens group L1 with positive refractive power, a second lens group L2 with positive refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with negative refractive power, which are arranged in this order from the object side to the image side. Furthermore, a fifth lens group L5 with positive refractive power and a sixth lens group L6 (rear lens group LR) with positive refractive power are arranged on the image side of the fourth lens group L4. During zooming from the wide-angle end to the telephoto end, the first lens group L1 and the sixth lens group L6 are stationary, the second lens group L2 and the third lens group L3 move monotonically from the object side to the image side, and the fourth lens group L4 and the fifth lens group L5 move. An aperture stop SP is arranged between the fifth lens group L5 and the sixth lens group L6. The intermediate group M is composed of a second lens group L2 having positive refractive power, a third lens group L3 having negative refractive power, a fourth lens group L4 having negative refractive power, and a fifth lens group L5 having positive refractive power, and the magnification varying group V is composed of the second lens group L2 and the third lens group L3.

[0044] Numerical examples 1 to 8 corresponding to the first to eighth embodiments, respectively, are shown below.

[0045] In the surface data of each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the axial spacing (distance on the optical axis) between the mth surface and the (m+1)th surface. Here, m is the surface number counted from the light incident side. In addition, nd represents the refractive index of each optical member with respect to the d-line, and νd represents the Abbe number of the optical member. The Abbe number νd of a certain material is given by the following when the refractive indices at the Fraunhofer lines d-line (587.6 nm), F-line (486.1 nm), C-line (656.3 nm), and g-line (wavelength 435.8 nm) are Nd, NF, and NC, respectively: νd=(Nd-1) / (NF-NC) It is expressed as:

[0046] The focal length (mm), F-number, and half angle of view (°) are the values ​​when the zoom lens is focused on an object at infinity. The total lens length is the distance on the optical axis from the lens surface closest to the object to the final surface (the lens surface closest to the image) of the zoom lens, plus the back focus BF. The back focus BF is the distance on the optical axis from the final surface of the zoom lens to the image surface, expressed in air equivalent length.

[0047] If the optical surface is aspheric, a * symbol is added to the right of the surface number. The aspheric shape is expressed as follows, where X is the displacement from the apex of the surface in the optical axis direction, h is the height from the optical axis in a direction perpendicular to the optical axis, R is the paraxial radius of curvature, k is the conic constant, and A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, and A16 are the aspheric coefficients of each order: x=(h 2 / R) / [1+{1-(1+k)(h / R) 2} 1 / 2 ]+A3×h 3 +A4×h 4 +A5×h 5 +A6×h 6 +A7×h 7 +A8×h 8 +A9×h 9 +A10×h 10 +A11×h 11 +A12×h 12 +A13×h 13 +A14×h 14 +A15×h 15 +A16×h 16 In addition, "e±XX" in each aspheric coefficient is expressed as "×10 ±XX " It means.

[0048] [Numerical Example 1] Unit: mm Surface Data Surface number rd nd νd 1 -149.059 1.50 1.76634 35.8 2 133.529 5.10 3 181.054 11.74 1.43387 95.1 4 -127.668 0.20 5 257.936 7.03 1.43387 95.1 6 -257.936 7.09 7 165.831 5.74 1.43387 95.1 8 1350.737 0.15 9 126.151 11.11 1.43387 95.1 10 -221.313 0.49 11 63.698 5.87 1.76385 48.5 12 108.416 (variable) 13* 107.013 0.85 2.05090 26.9 14 12.679 5.36 15 -30.111 0.60 1.88300 40.8 16 -401.121 6.78 1.89286 20.4 17 -10.830 0.65 2.00100 29.1 18 -126.500 0.18 19 53.124 2.75 1.78472 25.7 20 -139.718 (variable) 21 -36.661 0.90 1.95375 32.3 22 125.708 3.28 1.92286 18.9 23 -79.329 (variable) 24 270.503 6.86 1.77250 49.6 25* -47.332 0.15 26 43.458 1.10 1.89286 20.4 27 25.980 7.23 1.64000 60.1 28 201.186 (variable) 29(Aperture) ∞ 2.48 30 -131.227 3.40 1.84666 23.8 31 -38.975 0.90 1.81600 46.6 32 519.453 35.00 33 45.791 4.93 1.75520 27.5 34 -176.937 2.78 35 367.396 0.90 2.00100 29.1 36 22.124 6.97 1.49700 81.5 37 -88.326 0.20 38 357.352 4.77 1.48749 70.2 39 -28.360 0.90 1.88300 40.8 40 -204.507 0.15 41 43.617 6.23 1.48749 70.2 42 -42.787 4.00 43∞ 33.00 1.60859 46.4 44 ∞ 13.20 1.51633 64.1 45∞6.99 Image plane ∞ Aspheric Data Page 13 K = 1.99983e+00 A 4= 1.77649e-05 A 6=-5.29341e-08 A 8= 3.29999e-10 A10= 1.02584e-11 A12=-2.22171e-13 A14= 1.50679e-15 A16=-3.44562e-18 Page 25 K =-1.91921e-01 A 4= 8.11367e-07 A 6= 7.19921e-09 A 8=-1.46342e-10 A10= 1.41032e-12 A12=-6.88616e-15 A14= 1.65877e-17 A16=-1.56715e-20 Various data Zoom ratio 25.9 Focal length 7.58 29.35 196.35 F-number 1.80 1.80 2.95 Half angle of view 35.97 10.61 1.60 Image height 5.50 5.50 5.50 Lens total length 293.25 293.25 293.25 BF 36.17 36.17 36.17 d12 0.70 37.21 58.25 d20 68.05 12.89 3.40 d23 1.81 14.62 1.10 d28 3.17 9.01 10.98 Zoom lens group data Group starting plane focal length 1 1 72.15 2 13 -12.90 3 21 -71.58 4 24 36.72 5 30 52.73

[0049] [Numerical Example 2] Unit: mm Surface Data Surface number rd nd νd 1 -138.234 1.50 1.76634 35.8 2 170.307 3.00 3 338.059 9.37 1.43387 95.1 4 -127.590 0.20 5 313.524 6.64 1.43387 95.1 6 -192.054 7.10 7 122.116 6.38 1.43387 95.1 8 -25872.299 0.23 9 106.314 8.65 1.43387 95.1 10 -326.747 0.26 11 61.273 4.94 1.76385 48.5 12 95.552 (variable) 13* 56.137 0.40 2.05090 26.9 14 12.635 (variable) 15 -24.849 0.40 2.00100 29.1 16 38.456 8.26 1.89286 20.4 17 -10.415 0.40 2.00100 29.1 18 -76.934 0.18 19 71.811 2.56 1.76182 26.5 20 -126.719 (variable) 21 -172.115 0.50 1.88300 40.8 22 44.952 4.10 1.84666 23.8 23 -160.478 2.86 24 -34.526 0.50 1.88300 40.8 25 -83.742 (variable) 26* 209.117 6.13 1.72916 54.7 27 -40.907 0.20 28 86.596 6.42 1.64000 60.1 29 -57.682 1.00 1.95906 17.5 30 -147.085 (variable) 31(Aperture) ∞ 0.20 32 45.903 2.96 1.84666 23.8 33 114.086 0.70 1.95375 32.3 34 34.504 40.00 35 65.751 4.75 1.80518 25.4 36 -92.295 1.24 37 1946.788 0.70 1.88300 40.8 38 29.220 6.59 1.48749 70.2 39 -83.842 0.35 40 56.794 7.65 1.43875 94.7 41 -28.104 0.70 2.00100 29.1 42 -409.463 1.35 43 -989.440 4.70 1.49700 81.5 44 -30.294 4.00 45 ∞ 33.00 1.60859 46.4 46 ∞ 13.20 1.51633 64.1 47∞7.25 Image plane ∞ Aspheric Data Page 13 K = 1.42691e+00 A 4= 1.26196e-05 A 6= 3.32720e-08 A 8=-2.61470e-09 A10= 6.34657e-11 A12=-7.73970e-13 A14= 4.64465e-15 A16=-1.08712e-17 Page 26 K =-2.40244e-03 A 4=-2.90672e-06 A 6= 2.01624e-09 A 8=-4.49726e-12 A10= 1.00462e-14 A12=-8.67681e-18 Various data Zoom ratio 27.44 Focal length 7.50 30.17 205.77 F-number 1.80 1.80 3.34 Half angle of view 36.25 10.33 1.53 Image height 5.50 5.50 5.50 Lens length 289.76 289.76 289.76 BF 36.43 36.43 36.43 d12 0.61 35.69 55.91 d14 7.24 6.27 6.88 d20 67.13 13.73 5.63 d25 0.37 10.63 0.44 d30 2.91 11.93 9.41 Zoom lens group data Group starting plane focal length 1 1 70.95 2 13 -15.59 3 15 -51.52 4 21 -63.34 5 26 34.31 6 32 57.40

[0050] [Numerical Example 3] Unit: mm Surface Data Surface number rd nd νd 1 -186.995 2.70 1.76626 35.9 2 121.581 2.68 3 161.698 11.45 1.43387 95.1 4 -151.143 0.20 5 332.911 7.89 1.43387 95.1 6 -173.099 8.33 7 96.601 10.18 1.43387 95.1 8* -769.464 0.08 9* 71.753 8.68 1.67790 55.3 10 319.048 (variable) 11* 196.179 0.80 2.05090 26.9 12 13.709 5.48 13 -36.904 0.60 2.00100 29.1 14 32.209 8.16 1.89286 20.4 15 -11.409 0.60 2.00100 29.1 16 -139.541 0.18 17 56.854 2.85 1.68893 31.1 18 -71.288 (variable) 19 1144.644 0.75 1.95375 32.3 20 23.889 5.25 1.84666 23.8 21 -72.213 2.62 22 -29.908 0.75 1.88300 40.8 23* 3478.614 (variable) 24(Aperture) ∞ 1.00 25* 94.812 5.95 1.69680 55.5 26 -40.260 (variable) 27 976.422 5.56 1.70154 41.2 28 -33.179 1.00 1.85478 24.8 29 -214.139 35.01 30 107.922 4.35 1.80518 25.4 31 -79.390 0.87 32 196.419 1.00 1.88300 40.8 33 28.220 6.33 1.54072 47.2 34 -111.218 0.35 35 42.781 6.31 1.43875 94.7 36 -31.738 1.00 2.00100 29.1 37 138.596 4.24 38 168.047 5.87 1.49700 81.5 39 -32.869 4.00 40 ∞ 33.00 1.60859 46.4 41 ∞ 13.20 1.51633 64.1 42∞8.90 Image plane ∞ Aspheric Data Side 8 K = 0.00000e+00 A 4=-1.52704e-07 A 6= 3.50491e-11 A 8=-2.39431e-14 A10= 4.05434e-18 9th page K = 0.00000e+00 A 4=-1.22829e-07 A 6= 8.39307e-12 A 8=-1.88321e-14 Page 11 K = 2.00007e+00 A 4= 1.93441e-05 A 6=-9.31852e-08 A 8= 1.20272e-09 A10=-6.28823e-12 A12=-5.74209e-14 A14= 7.80501e-16 A16=-2.42969e-18 Page 23 K = 2.00642e+00 A 4=-4.24463e-06 A 6= 2.24962e-09 A 8=-1.96288e-11 A10= 1.61556e-13 A12=-4.84513e-16 Page 25 K =-1.98400e+00 A 4=-4.43675e-06 A 6= 3.79530e-09 A 8=-1.07807e-11 A10= 3.19470e-14 A12=-4.16677e-17 Various data Zoom ratio 28.98 Focal length 7.50 29.41 217.38 F-number 1.80 1.80 3.34 Half angle of view 36.25 10.59 1.45 Image height 5.50 5.50 5.50 Lens total length 287.11 287.11 287.11 BF 38.08 38.08 38.08 d10 0.72 38.53 60.32 d18 57.12 5.45 4.14 d23 6.58 14.12 0.72 d26 4.54 10.85 3.77 Zoom lens group data Group starting plane focal length 1 1 74.54 2 11 -13.66 3 19 -47.07 4 25 41.30 5 27 56.45

[0051] [Numerical Example 4] Unit: mm Surface Data Surface number rd nd νd 1 -2960.759 6.00 1.83481 42.7 2 342.798 1.80 3 339.840 22.48 1.43387 95.1 4 -1344.795 0.20 5 558.616 15.19 1.43387 95.1 6 -1579.208 24.66 7 492.871 17.82 1.43387 95.1 8 -1180.646 0.25 9 278.681 19.42 1.43387 95.1 10 4050.156 1.50 11 178.207 15.48 1.43875 94.7 12 343.323 (variable) 13* -401.950 2.20 2.00330 28.3 14 37.994 12.76 15 -35.208 1.45 1.74400 44.8 16 146.611 8.24 1.92286 18.9 17 -46.350 2.00 1.88300 40.8 18 -85.013 0.30 19 625.157 1.45 1.56732 42.8 20 271.154 (variable) 21 105.950 11.77 1.72151 29.2 22* -498.956 0.20 23 120.453 13.58 1.43875 94.7 24 -202.252 0.30 25 6215.237 2.60 1.85478 24.8 26 87.124 (variable) 27 68.468 17.28 1.52841 76.5 28 -179.887 0.50 29 372.767 2.50 1.84666 23.8 30 104.953 7.07 1.61772 49.8 31* 3484.334 (variable) 32(Aperture) ∞ 4.51 33 -293.614 1.40 1.88300 40.8 34 61.360 0.50 35 34.204 2.31 1.92286 18.9 36 39.119 8.36 37 -31.523 1.70 1.80400 46.5 38 -35.076 6.70 39 89.085 1.50 1.80400 46.5 40 26.701 5.43 1.84666 23.9 41 148.112 4.45 42 -44.171 1.50 1.89190 37.1 43 59.048 10.67 1.51633 64.1 44 -25.531 9.53 45 -24.840 1.50 1.51742 52.4 46 -35.025 1.80 47 -2466.789 1.50 1.88300 40.8 48 30.308 9.38 1.48749 70.2 49 -64.516 0.20 50 238.884 7.15 1.51742 52.4 51 -32.144 1.50 1.88300 40.8 52 -66.449 0.20 53 94.990 10.25 1.53996 59.5 54 -39.633 10.00 55 ∞ 33.00 1.60859 46.4 56 ∞ 13.20 1.51633 64.2 57∞13.39 Image plane ∞ Aspheric Data Page 13 K =-1.99999e+00 A 4= 1.75498e-06 A 6=-2.58736e-08 A 8=-2.22341e-10 A10= 1.04588e-12 A12= 1.78305e-15 A14= 9.06297e-19 A16= 6.58203e-22 A 3= 4.61050e-09 A 5= 7.05658e-08 A 7= 3.62436e-09 A 9=-1.14750e-12 A11=-6.58045e-14 A13=-2.46344e-17 A15=-4.27445e-20 Page 22 K = 5.15118e+01 A 4= 3.34713e-07 A 6=-8.48272e-11 A 8=-1.73260e-13 A10=-2.28559e-15 A12=-1.41953e-17 A14=-1.00443e-20 A16=-5.63822e-25 A 3= 2.15327e-08 A 5=-5.51281e-11 A 7= 6.58475e-12 A 9= 8.91492e-15 A11= 2.47150e-16 A13= 4.86866e-19 A15= 1.15156e-22 Page 31 K =-2.56967e+04 A 4= 6.73337e-07 A 6= 1.72494e-09 A 8= 2.94699e-11 A10=-5.19096e-14 A12=-2.06562e-16 A14=-1.17268e-19 A16=-9.68931e-24 A 3= 4.52863e-07 A 5= 7.61605e-09 A 7=-3.77268e-10 A 9=-6.58026e-13 A11= 4.89592e-15 A13= 5.78151e-18 A15= 1.55918e-21 Various data Zoom ratio 120.00 Focal length 8.50 65.35 1020.00 F-number 1.75 1.75 5.30 Half angle of view 32.91 4.81 0.31 Image height 5.50 5.50 5.50 Lens total length 677.63 677.63 677.63 BF 42.57 42.57 42.57 d12 3.63 139.79 192.75 d20 298.97 121.68 2.00 d26 1.50 15.16 1.66 d31 2.91 30.38 110.61 Zoom lens group data Group starting plane focal length 1 1 251.50 2 13 -25.59 3 21 179.71 4 27 96.46 5 33 39.60

[0052] [Numerical Example 5] Unit: mm Surface Data Surface number rd nd νd 1 -370.652 2.70 1.74951 35.3 2 131.952 0.39 3 134.325 5.25 1.95906 17.5 4 204.984 6.39 5 203.484 11.33 1.60311 60.6 6* -216.095 12.80 7 139.984 2.40 1.85478 24.8 8 69.597 8.92 1.43875 94.7 9 165.354 5.66 10 96.303 10.33 1.43387 95.1 11 -767.371 0.20 12 87.402 9.00 1.76385 48.5 13 1010.784 (variable) 14* -174.836 0.90 1.90525 35.0 15 23.002 4.28 16 -46.646 0.75 1.76385 48.5 17 60.343 6.97 1.85478 24.8 18 -20.488 0.90 1.80100 35.0 19 102.863 0.15 20 46.972 2.62 1.85478 24.8 21 136.557 (variable) 22 -55.692 1.30 1.89190 37.1 23 91.347 3.46 1.89286 20.4 24 -254.153 (variable) 25* 62.655 7.06 1.71300 53.9 26 -81.479 0.15 27 49.180 1.10 1.85478 24.8 28 33.862 4.26 1.43875 94.7 29 87.175 (variable) 30(Aperture) ∞ 2.93 31 62.061 7.11 1.48749 70.2 32 -58.279 1.80 2.00100 29.1 33 66.072 4.74 34 67.392 6.67 1.67300 38.3 35 -70.898 31.35 36 64.792 4.54 1.80810 22.8 37 -1072.118 4.44 38 26.715 6.87 1.56732 42.8 39 70.407 1.10 1.95375 32.3 40 22.698 4.05 41 45.393 9.23 1.43875 94.7 42 -19.968 1.10 1.88300 40.8 43 86.506 6.34 44 86.886 10.70 1.43875 94.7 45 -27.846 37.49 Image plane ∞ Aspheric Data Page 6 K =-1.41970e+00 A 4= 6.62238e-08 A 6= 1.27405e-12 A 8=-2.99865e-15 A10= 1.53264e-18 A12=-3.77744e-22 Side 14 K =-4.99546e+02 A 4=-8.13143e-06 A 6= 6.88563e-08 A 8=-4.24399e-10 A10= 1.64454e-12 A12=-2.88032e-15 Page 25 K = 2.76342e-01 A 4=-2.97486e-06 A 6= 1.98885e-09 A 8=-4.11948e-12 A10= 5.66245e-15 A12=-3.19480e-18 Various data Zoom ratio 9.53 Focal length 26.24 79.33 249.96 F-number 2.73 2.73 3.49 Half angle of view 29.43 10.57 3.39 Image height 14.80 14.80 14.80 Lens total length 315.61 315.61 315.61 BF 37.49 37.49 37.49 d13 2.00 37.46 56.55 d21 43.88 4.01 4.77 d24 5.24 15.23 0.88 d29 14.75 9.17 3.68 Zoom lens group data Group starting plane focal length 1 1 85.54 2 14 -19.01 3 22 -80.98 4 25 48.73 5 31 94.26

[0053] [Numerical Example 6] Unit: mm Surface Data Surface number rd nd νd 1* 1164.523 2.50 1.83481 42.7 2 31.806 16.24 3* 116.859 2.00 1.83481 42.7 4 73.633 11.47 5 -91.374 1.80 1.83481 42.7 6 -390.193 0.15 7 90.685 4.30 1.92286 18.9 8 254.377 2.27 9 188.429 9.30 1.60300 65.4 10* -84.461 4.41 11 683.245 8.40 1.43387 95.1 12 -59.788 0.60 13 -54.986 1.70 1.80000 29.8 14 -126.219 0.18 15 167.309 1.70 1.91650 31.6 16 52.053 13.75 1.43875 94.7 17 -108.061 0.40 18 803.874 8.36 1.43387 95.1 19 -70.981 0.40 20 85.474 8.45 1.76385 48.5 21 -205.953 (variable) 22 55.970 0.70 2.00100 29.1 23 13.891 4.70 24 -37.737 0.70 1.88300 40.8 25 45.092 6.32 1.85478 24.8 26 -14.907 0.70 1.85150 40.8 27 93.123 0.71 28 34.631 3.27 1.64769 33.8 29 -130.870 (variable) 30 -32.995 0.80 1.72916 54.7 31 62.730 2.37 1.84666 23.8 32 -557.636 (variable) 33* 95.606 6.09 1.58913 61.1 34 -48.189 0.20 35 112.959 6.19 1.48749 70.2 36 -36.699 1.00 1.80100 35.0 37 -53.579 (variable) 38(Aperture) ∞ 3.06 39 -96.913 3.84 1.84666 23.8 40 -46.420 1.00 1.83481 42.7 41 -2097.238 35.50 42 95.809 4.96 1.63980 34.5 43 -46.690 0.77 44 -182.106 0.90 1.88300 40.8 45 30.015 5.03 1.48749 70.2 46 -128.853 0.20 47 59.263 7.70 1.43875 94.7 48 -21.626 0.90 2.00100 29.1 49 -69.038 0.14 50 132.223 5.45 1.48749 70.2 51 -31.625 4.00 52 ∞ 33.00 1.60859 46.4 53 ∞ 13.20 1.51680 64.2 54∞7.45 Image plane ∞ Aspheric Data Front page K = 0.00000e+00 A 4= 5.03102e-06 A 6= 4.83452e-08 A 8= 1.59416e-10 A10=-7.63677e-15 A12= 1.64471e-16 A14=-2.52910e-20 A16=-9.39669e-24 A 3=-1.19621e-06 A 5=-3.82397e-07 A 7=-3.83715e-09 A 9=-2.47278e-12 A11=-2.19296e-15 A13=-2.81837e-18 A15= 1.19260e-21 3rd page K = 0.00000e+00 A 4=-3.91833e-06 A 6=-1.36930e-07 A 8=-8.58604e-10 A10= 6.54807e-13 A12= 2.38917e-15 A14=-1.00159e-18 A16=-3.03481e-22 A 3= 2.79304e-06 A 5= 7.94989e-07 A 7= 1.44093e-08 A 9= 2.12004e-11 A11=-7.19102e-14 A13=-2.04972e-17 A15= 3.25713e-20 Side 10 K = 0.00000e+00 A 4= 9.86087e-07 A 6= 1.91585e-10 A 8=-9.03646e-13 A10= 9.05947e-16 A12=-1.75246e-18 A14= 2.11271e-21 A16=-9.30590e-25 Page 33 K =-3.11230e+01 A 4=-2.74594e-08 A 6=-3.90615e-09 A 8= 2.89026e-12 Various data Zoom ratio 13.61 Focal length 4.43 15.50 60.27 F-number 1.86 1.86 2.78 Half angle of view 51.16 19.54 5.21 Image height 5.50 5.50 5.50 Lens total length 315.65 315.65 315.65 BF 36.63 36.63 36.63 d21 0.65 30.27 43.40 d29 40.91 7.47 2.95 d32 13.10 17.10 2.09 d37 1.77 1.60 8.00 Zoom lens group data Group starting plane focal length 1 1 26.47 2 22 -17.26 3 30 -53.67 4 33 35.95 5 39 50.60

[0054] [Numerical Example 7] Unit: mm Surface Data Surface number rd nd νd 1 1207.909 3.00 1.83481 42.7 2* 55.913 10.87 3 221.717 2.30 1.85478 24.8 4 96.026 10.21 1.43875 94.7 5 -172.823 3.33 6 96.680 11.04 1.43387 95.1 7 -124.716 3.62 8 78.531 7.97 1.43875 94.7 9* 238.011 1.34 10* 88.652 6.13 1.76385 48.5 11 -462.569 (variable) 12* 530.270 0.80 1.95375 32.3 13 14.268 5.96 14 -34.707 0.80 1.89190 37.1 15 -868.073 6.62 1.89286 20.4 16 -12.175 0.60 1.95375 32.3 17 693.142 0.18 18 49.390 3.73 1.63854 55.4 19 -53.360 (variable) 20 -29.380 0.75 1.71300 53.8 21 67.633 2.71 1.80810 22.8 22 -270.658 (variable) 23* 78.252 5.46 1.72916 54.7 24 -54.805 0.21 25 -194.186 1.10 1.85478 24.8 26 41.770 7.02 1.78336 49.5 27 -64.543 (variable) 28(Aperture) ∞ 2.89 29 235.485 7.56 1.72151 29.2 30 -35.252 0.90 1.74100 52.6 31 91.511 35.00 32 56.399 6.59 1.74840 27.7 33 -128.961 3.77 34 -173.982 1.00 1.88300 40.8 35 20.370 7.33 1.49700 81.5 36 -43.973 0.35 37 59.400 4.93 1.43875 94.7 38 -30.108 1.00 2.00100 29.1 39 1267.464 1.08 40 48.083 5.82 1.50137 56.4 41 -29.886 4.00 42∞ 33.00 1.60859 46.4 43 ∞ 13.20 1.51633 64.1 44∞6.12 Image plane ∞ Aspheric Data 2nd side K = 0.00000e+00 A 4=-3.43145e-07 A 6= 1.06780e-10 A 8= 2.40639e-14 A10= 1.80947e-17 9th page K = 0.00000e+00 A 4=-1.45384e-06 A 6=-4.02190e-10 A 8=-3.58382e-12 A10= 6.85981e-15 A12=-5.69160e-18 A14= 2.37218e-21 A16=-3.97040e-25 Side 10 K = 0.00000e+00 A 4=-9.72082e-07 A 6=-3.20874e-10 A 8=-2.10794e-12 A10= 3.46286e-15 A12=-2.53034e-18 A14= 8.76320e-22 A16=-1.11644e-25 Side 12 K = 1.79025e+00 A 4= 1.23818e-05 A 6=-5.55177e-08 A 8= 1.34367e-09 A10=-1.68482e-11 A12= 9.17433e-14 A14=-1.62902e-16 A16=-1.15593e-19 Page 23 K =-1.74872e+00 A 4=-4.27407e-06 A 6= 3.12809e-09 A 8=-5.35518e-12 A10= 6.98644e-15 A12= 7.13416e-18 Various data Zoom ratio 20.77 Focal length 6.50 25.39 135.00 F-number 1.80 1.80 3.10 Angle of view 40.24 25.46 2.33 Image height 5.50 5.50 5.50 Lens total length 295.00 295.00 295.00 BF 35.30 35.30 35.30 d11 0.68 35.29 55.23 d19 57.65 7.20 2.91 d22 6.10 13.37 0.03 d27 0.27 8.84 6.53 Zoom lens group data Group starting plane focal length 1 1 56.98 2 12 -15.64 3 20 -50.69 4 23 36.82 5 29 49.16

[0055] [Numerical Example 8] Unit: mm Surface Data Surface number rd nd νd 1* -750.452 2.50 1.83481 42.7 2 34.564 17.38 3* 176.589 2.00 1.83481 42.7 4 72.537 12.00 5 -108.569 1.80 1.83481 42.7 6 -239.383 0.15 7 95.251 4.30 1.92286 18.9 8 228.582 4.11 9 641.885 9.61 1.60300 65.4 10* -70.749 4.36 11 -114.476 7.39 1.43387 95.1 12 -47.652 0.30 13 -46.323 1.70 1.80000 29.8 14 -69.694 0.18 15 112.624 1.70 1.91650 31.6 16 55.968 19.17 1.43875 94.7 17 -62.064 0.40 18 105.733 9.17 1.43387 95.1 19 -148.426 (variable) 20 294.057 4.14 1.76385 48.5 21 -239.009 (variable) 22 230.584 0.70 2.00100 29.1 23 25.692 4.63 24 -33.805 0.70 1.88300 40.8 25 45.429 5.18 1.92286 18.9 26 -39.773 0.70 1.85150 40.8 27 -95.175 (variable) 28 -28.164 0.80 1.72916 54.7 29 38.036 2.41 1.84666 23.8 30 507.411 (variable) 31* 133.445 4.06 1.58913 61.1 32 -136.241 0.20 33 60.410 4.50 1.48749 70.2 34 -110.091 1.00 1.80100 35.0 35 -133.571 (variable) 36(Aperture) ∞ 2.42 37 -217.783 2.55 1.84666 23.8 38 -106.717 1.00 1.83481 42.7 39 -240.126 35.49 40 68.617 4.96 1.63980 34.5 41 -57.216 1.34 42 -147.640 0.90 1.88300 40.8 43 28.716 4.83 1.48749 70.2 44 -249.121 0.20 45 47.464 7.50 1.43875 94.7 46 -23.893 0.90 2.00100 29.1 47 -66.526 0.13 48 81.482 5.19 1.48749 70.2 49 -39.016 4.00 50 ∞ 33.00 1.60859 46.4 51 ∞ 13.20 1.51680 64.2 52∞7.45 Image plane ∞ Aspheric Data Front page K = 0.00000e+00 A 4=-3.07528e-06 A 6=-1.35465e-07 A 8=-9.08380e-11 A10= 1.69020e-13 A12=-1.31925e-16 A14= 4.58861e-20 A16= 6.98974e-24 A 3= 1.86742e-05 A 5= 1.36133e-06 A 7= 6.43774e-09 A 9=-4.39661e-12 A11= 1.00333e-15 A13= 1.15617e-18 A15=-1.08628e-21 3rd page K = 0.00000e+00 A 4=-1.10775e-06 A 6=-9.33976e-08 A 8=-9.89967e-10 A10= 2.36032e-12 A12= 9.94721e-15 A14=-1.51623e-18 A16=-9.40225e-22 A 3=-4.65083e-06 A 5= 2.20775e-07 A 7= 1.37912e-08 A 9= 2.17833e-11 A11=-2.43453e-13 A13=-1.61249e-16 A15= 9.16438e-20 Side 10 K = 0.00000e+00 A 4= 9.98610e-07 A 6=-3.31261e-10 A 8= 1.69782e-12 A10=-2.83597e-15 A12= 8.44624e-19 A14= 1.98407e-21 A16=-1.50273e-24 Page 31 K =-8.16174e+01 A 4= 6.89446e-07 A 6=-6.14960e-09 A 8= 3.92442e-12 Various data Zoom ratio 13.61 Focal length 4.43 15.50 60.26 F-number 1.86 1.86 2.77 Half angle of view 51.17 19.54 5.21 Image height 5.50 5.50 5.50 Lens total length 315.66 315.66 315.66 BF 36.63 36.63 36.63 d19 0.40 9.28 13.49 d21 0.63 24.75 36.22 d27 32.03 4.20 1.50 d30 21.89 22.50 2.08 d35 8.42 2.63 10.07 Zoom lens group data Group starting plane focal length 1 1 39.95 2 20 173.19 3 22 -20.40 4 28 -40.81 5 31 51.13 6 37 48.62

[0056] The table below gives various values ​​for each example.

[0057] [Table 1]

[0058] [Imaging device] FIG. 17 shows a configuration example of an imaging device 125. In FIG. 17, 101 is a zoom lens according to any one of the first to eighth embodiments. 124 is a camera body. The zoom lens 101 is detachable from the camera body 124. In this figure, the first lens group L1 is shown as a lens group F, the middle group M as a lens group LZ, and the rear lens group LR as a lens group R. SP is an aperture stop, and 114 and 115 are drive mechanisms for driving the lens group that moves during focusing and the lens group that moves during zooming, respectively, and include a helicoid, a cam, and the like. 116 to 118 are motors (actuators) that drive the drive mechanisms 114 and 115 and the aperture stop SP. 119 to 121 are detectors for detecting the position of each lens group and the aperture diameter of the aperture stop SP, and are composed of an encoder, a potentiometer, a photosensor, and the like.

[0059] In the camera 124, reference numeral 109 denotes a glass block denoted by P in the first to eighth embodiments. Reference numeral 110 denotes an imaging element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor that photoelectrically converts (captures) an object image formed by the zoom lens 101. Reference numerals 111 and 122 denote processing units that perform various types of processing and control in the camera 124 and the zoom lens 101, respectively, and include a processor such as a CPU.

[0060] By using the zoom lenses according to the first to eighth embodiments described above, it is possible to provide a small and lightweight imaging device 125 capable of obtaining good captured images.

[0061] The above-described embodiment includes the following configurations.

[0062] (Configuration 1) A zoom lens having a first lens group having positive refractive power that does not move for zooming, an intermediate group including two or more lens groups that move for zooming, and a rear lens group having positive refractive power that does not move for zooming, which are arranged in this order from an object side to an image side, and in which a distance between adjacent lens groups changes during zooming, the intermediate group has a magnification varying group including one or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, the variable power group is composed of five lenses including a cemented lens in which three lenses are cemented together, When the average value of the refractive index at the d-line of the material of the negative lens included in the magnification varying group is Ndn_ave, and the average value of the Abbe number based on the d-line of the material of the negative lens included in the magnification varying group is νdn_ave, 1.70 <Ndn_ave<2.10 20.0<νdn_ave<40.0 A zoom lens characterized by satisfying the following conditional expressions:

[0063] (Configuration 2) Let R1 be the radius of curvature of the lens surface on the object side of the negative lens arranged closest to the image side in the cemented lens, and R2 be the radius of curvature of the lens surface on the image side. 0.5<(R2+R1) / (R2-R1)<3.5 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

[0064] (Configuration 3) When the average value of the refractive index at the d-line of the material of the positive lenses included in the magnification varying group is Ndp_ave, 1.70 <Ndp_ave<2.10 3. The zoom lens according to configuration 1 or 2, wherein the following condition is satisfied:

[0065] (Configuration 4) When the average Abbe number of the material of the positive lenses included in the magnification varying group with respect to the d-line is νdp_ave, 15.0<νdp_ave<40.0 4. The zoom lens according to any one of configurations 1 to 3, wherein the following condition is satisfied:

[0066] (Configuration 5) Let mv be the amount of movement of the lens group that moves the largest amount during zooming from the wide-angle end to the telephoto end among the lens groups included in the intermediate group, and Td be the distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image side of the zoom lens at the wide-angle end. 0.1<|mv| / Td<0.4 5. The zoom lens according to any one of configurations 1 to 4, wherein the following condition is satisfied:

[0067] (Configuration 6) Let fv be the focal length of the variable magnification group at the wide-angle end, and ft be the focal length of the zoom lens at the telephoto end. -0.50 <fv / ft<-0.01 6. The zoom lens according to any one of configurations 1 to 5, wherein the following condition is satisfied:

[0068] (Configuration 7) When the focal length of the magnification varying group at the wide-angle end is fv and the focal length of the first lens group is f1, -1.0 <fv / f1<-0.05 7. The zoom lens according to claim 1, wherein the following condition is satisfied:

[0069] (Configuration 8) Let βvw and βvt be the lateral magnifications of the variable power group at the wide-angle end and the telephoto end, respectively, and Zwt be the variable power ratio of the zoom lens. 0.1<(βvt / βvw) / Zwt<3.0 8. The zoom lens according to any one of configurations 1 to 7, wherein the following condition is satisfied:

[0070] (Configuration 9) The zoom lens according to any one of Configurations 1 to 8, wherein the variable magnification group is composed of a first negative lens, a second negative lens, a first positive lens, a third negative lens, and a second positive lens, arranged in this order from the object side to the image side.

[0071] (Configuration 10) 10. The zoom lens according to configuration 9, wherein the second negative lens, the first positive lens, and the third negative lens form the cemented lens.

[0072] (Configuration 11) The zoom lens according to any one of Configurations 1 to 8, wherein the variable magnification group is composed of a first positive lens, a first negative lens, a second negative lens, a second positive lens, and a third negative lens, arranged in this order from the object side to the image side.

[0073] (Configuration 12) 12. The zoom lens according to configuration 11, wherein the second negative lens, the second positive lens, and the third negative lens form the cemented lens.

[0074] (Configuration 13) The zoom lens according to any one of configurations 1 to 12, wherein the intermediate group is composed of, arranged in order from the object side to the image side, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, and a fourth lens group having positive refractive power that moves for zooming.

[0075] (Configuration 14) The zoom lens according to any one of configurations 1 to 12, wherein the intermediate group is composed of, arranged in order from the object side to the image side, a second lens group having negative refractive power that moves for zooming, a third lens group having positive refractive power that moves for zooming, and a fourth lens group having positive refractive power that moves for zooming.

[0076] (Configuration 15) The zoom lens according to any one of configurations 1 to 12, wherein the intermediate group is composed of, arranged in order from the object side to the image side, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having negative refractive power that moves for zooming, and a fifth lens group having positive refractive power that moves for zooming.

[0077] (Configuration 16) The zoom lens according to any one of configurations 1 to 12, wherein the intermediate group is composed of, arranged in order from the object side to the image side, a second lens group having positive refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having negative refractive power that moves for zooming, and a fifth lens group having positive refractive power that moves for zooming.

[0078] (Configuration 17) 17. An imaging apparatus comprising: the zoom lens according to any one of configurations 1 to 16; and an imaging element that photoelectrically converts an image formed by the zoom lens. [Explanation of symbols]

[0079] L1 First lens group M intermediate group LR rear lens group

Claims

1. A zoom lens having a first lens group having positive refractive power and not moving for zooming, an intermediate group including two or more lens groups that move for zooming, and a rear lens group having positive refractive power and not moving for zooming, which are arranged in this order from an object side to an image side, and in which a distance between adjacent lens groups changes during zooming, the intermediate group has a magnification varying group including one or more lens groups that move monotonically toward the image side during zooming from a wide-angle end to a telephoto end, the magnification varying group is composed of five lenses including a cemented lens in which three lenses are cemented together, When the average value of the refractive index at the d-line of the material of the negative lens included in the magnification varying group is Ndn_ave, and the average value of the Abbe number based on the d-line of the material of the negative lens included in the magnification varying group is νdn_ave, 1.70<Ndn_ave<2.10 20.0<νdn_ave<40.0 A zoom lens characterized by satisfying the following conditional expressions:

2. Let R1 be the radius of curvature of the lens surface on the object side of the negative lens arranged closest to the image side of the cemented lens, and R2 be the radius of curvature of the lens surface on the image side. 0.5<(R2+R1) / (R2-R1)<3.5 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

3. When the average value of the refractive index at the d-line of the material of the positive lens included in the magnification varying group is Ndp_ave, 1.70<Ndp_ave<2.10 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. When the average Abbe number of the material of the positive lens included in the magnification varying group with respect to the d-line is νdp_ave, 15.0<νdp_ave<40.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. Let mv be the amount of movement of the lens group that moves the largest amount during zooming from the wide-angle end to the telephoto end among the lens groups included in the intermediate group, and Td be the distance on the optical axis from the lens surface closest to the object side to the lens surface closest to the image side of the zoom lens at the wide-angle end. 0.1<|mv| / Td<0.4 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. When the focal length of the magnification varying group at the wide-angle end is fv and the focal length of the zoom lens at the telephoto end is ft, -0.50<fv / ft<-0.01 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. When the focal length of the magnification varying group at the wide-angle end is fv and the focal length of the first lens group is f1, -1.0<fv / f1<-0.05 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

8. Let βvw and βvt be the lateral magnifications of the variable power group at the wide-angle end and the telephoto end, respectively, and Zwt be the variable power ratio of the zoom lens. 0.1<(βvt / βvw) / Zwt<3.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

9. 2. The zoom lens according to claim 1, wherein the variable magnification group comprises, in order from the object side to the image side, a first negative lens, a second negative lens, a first positive lens, a third negative lens, and a second positive lens.

10. 10. The zoom lens according to claim 9, wherein the second negative lens, the first positive lens, and the third negative lens form the cemented lens.

11. 2. The zoom lens according to claim 1, wherein the variable magnification group comprises, in order from the object side to the image side, a first positive lens, a first negative lens, a second negative lens, a second positive lens, and a third negative lens.

12. 12. The zoom lens according to claim 11, wherein the second negative lens, the second positive lens, and the third negative lens form the cemented lens.

13. 2. The zoom lens according to claim 1, wherein the intermediate group comprises, arranged in order from the object side to the image side, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, and a fourth lens group having positive refractive power that moves for zooming.

14. 2. The zoom lens according to claim 1, wherein the intermediate group comprises, arranged in order from the object side to the image side, a second lens group having negative refractive power that moves for zooming, a third lens group having positive refractive power that moves for zooming, and a fourth lens group having positive refractive power that moves for zooming.

15. 2. The zoom lens according to claim 1, wherein the intermediate group comprises, arranged in order from the object side to the image side, a second lens group having negative refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having negative refractive power that moves for zooming, and a fifth lens group having positive refractive power that moves for zooming.

16. 2. The zoom lens according to claim 1, wherein the intermediate group is composed of, arranged in order from the object side to the image side, a second lens group having positive refractive power that moves for zooming, a third lens group having negative refractive power that moves for zooming, a fourth lens group having negative refractive power that moves for zooming, and a fifth lens group having positive refractive power that moves for zooming.

17. Let R1 be the radius of curvature of the lens surface on the object side of the negative lens arranged closest to the image side of the cemented lens, and R2 be the radius of curvature of the lens surface on the image side. 0.5<(R2+R1) / (R2-R1)<3.5 17. The zoom lens according to claim 3, which satisfies the following condition:

18. When the average value of the refractive index at the d-line of the material of the positive lens included in the magnification varying group is Ndp_ave, 1.70<Ndp_ave<2.10 17. The zoom lens according to claim 4, wherein the following condition is satisfied:

19. Let R1 be the radius of curvature of the lens surface on the object side of the negative lens arranged closest to the image side among the cemented lenses, R2 be the radius of curvature of the lens surface on the image side, and Ndp_ave be the average value of the refractive index at the d-line of the material of the positive lenses included in the magnification varying group. 0.5<(R2+R1) / (R2-R1)<3.5 1.70<Ndp_ave<2.10 17. The zoom lens according to claim 4, wherein the following condition is satisfied:

20. 17. An imaging apparatus comprising: the zoom lens according to claim 1; and an imaging element for photoelectrically converting an image formed by the zoom lens.

Images