Zoom lens and imaging device

Abstract

To provide a zoom lens which is advantageous, for example, in terms of a wide view angle, a high zoom ratio, and high optical performance over an entire zoom range.SOLUTION: A zoom lens according to an aspect of the present invention comprises a first lens group with positive refractive power configured to be stationary for zooming, at least three lens groups configured to move while zooming, and a final lens group with positive refractive power, arranged in order from the object side to the image side, and is configured in such a manner that distances between adjacent lens groups change while zooming. The zoom lens includes an aperture stop disposed in or next to the final lens group. A refractive index an Abbe number of a positive lens located on the most object side among positive lenses of the first lens group, a focal length of the first lens group, a focal length of the zoom lens at the wide-angle end, a focal length of the zoom lens at the telephoto end, and a back focus of the zoom lens at the wide-angle end are set appropriately.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens and an imaging device.

Background Art

[0002] With the improvement in functionality of imaging devices (cameras) using image sensors, there is a demand for zoom lenses having a high zoom ratio and high optical performance. In particular, for high-pixel image sensors used in professional-use television cameras and movie cameras, high resolution with high uniformity from the center to the periphery of the image and low chromatic aberration are required. As such a zoom lens, a positive-lead type zoom lens having a lens group with positive refractive power on the object side and having five or more lens groups as a whole is known.

[0003] In Patent Document 1, there is disclosed a zoom lens composed of, in order from the object side to the image side, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power, and having a zoom ratio of about 7.

[0004] In Patent Document 2, there is disclosed a zoom lens composed of, in order from the object side to the image side, a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with negative refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power, and having a zoom ratio of about 8.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] In positive-lead zoom lenses, achieving a wide angle of view, high zoom ratio, and high optical performance requires appropriate arrangement of refractive power and glass materials in each lens group. For example, the lens group closest to the object is significantly affected by chromatic aberration because the off-axis light beam passes through a position significantly away from the optical axis.

[0007] The present invention aims to provide a zoom lens that is advantageous in terms of, for example, a wide angle of view, a high zoom ratio, and high optical performance across the entire zoom range. [Means for solving the problem]

[0008] One aspect of the present invention is a zoom lens comprising a first lens group with positive refractive power that does not move for zooming, arranged sequentially from the object side to the image side, at least three lens groups that move during zooming, and a final lens group with positive refractive power, wherein the spacing between adjacent lens groups changes during zooming. The first lens group consists of a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power, and a third sub-lens group with positive refractive power, arranged in order from the object side to the image side. The spacing between adjacent sub-lens groups changes for focusing, the first sub-lens group does not move for focusing, at least the second sub-lens group moves for focusing, and the third sub-lens group does not move for focusing. Of the at least three lens groups that move during zooming, at least two lens groups have negative refractive power, and have an aperture diaphragm located within or adjacent to the final lens group, and the refractive index and Abbe number of the positive lens closest to the object among the positive lenses of the first lens group are np and νp, respectively, the focal length of the first lens group is f1, the focal length at the wide-angle end of the zoom lens is fw, the focal length at the telephoto end of the zoom lens is ft, and the back focus at the wide-angle end of the zoom lens is BF The focal length of the positive lens closest to the object in the first lens group is fp1, and the focal length of the first sub-lens group is f11. as, 1.86 ≤ np ≤ 2.15 15.0 ≤ νp ≤ 22.0 2.43 ≤ ft / f1 ≤ 6.00 0.28 ≤ fw / BF ≤ 0.43 -3.00 ≤ fp1 / f11 ≤ -1.90 -1.25 ≤ f11 / f1 ≤ -0.70 It is characterized by satisfying the following conditional expression. [Effects of the Invention]

[0009] According to the present invention, for example, it is possible to provide a zoom lens that is advantageous in terms of wide angle of view, high zoom ratio, and high optical performance across the entire zoom range. [Brief explanation of the drawing]

[0010] [Figure 1] This is a cross-sectional view of the zoom lens of Example 1 at the wide-angle end when it is in focus on an object at infinity. [Figure 2] These are aberration diagrams of the zoom lens of Example 1 at the wide-angle end (A) and the telephoto end (B) when it is in focus on an object at infinity. [Figure 3] This is a cross-sectional view of the zoom lens of Example 2 at the wide-angle end when it is in focus on an object at infinity. [Figure 4] These are aberration diagrams of the zoom lens of Example 2 at the wide-angle end (A) and the telephoto end (B) when it is in focus on an object at infinity. [Figure 5] This is a cross-sectional view of the zoom lens of Example 3 at the wide-angle end when it is in focus on an object at infinity. [Figure 6] These are aberration diagrams of the zoom lens of Example 3 at the wide-angle end (A) and the telephoto end (B) when it is in focus on an object at infinity. [Figure 7] This is a cross-sectional view of the zoom lens of Example 4 at the wide-angle end when it is in focus on an object at infinity. [Figure 8] These are aberration diagrams of the zoom lens of Example 4 at the wide-angle end (A) and the telephoto end (B) when it is in focus on an object at infinity. [Figure 9] This is a cross-sectional view of the zoom lens of Example 5 at the wide-angle end when it is in focus on an object at infinity. [Figure 10] These are aberration diagrams of the zoom lens of Example 5 at the wide-angle end (A) and the telephoto end (B) when it is in focus on an object at infinity. [Figure 11] This is a cross-sectional view of the zoom lens of Example 6 at the wide-angle end when it is in focus on an object at infinity. [Figure 12] These are aberration diagrams of the zoom lens of Example 6 at the wide-angle end (A) and the telephoto end (B) when it is in focus on an object at infinity. [Figure 13] It is a lens cross-sectional view at the wide-angle end when the zoom lens of Example 7 is focused on an infinite object. [Figure 14] It is an aberration diagram at the (A) wide-angle end and (B) telephoto end when the zoom lens of Example 7 is focused on an infinite object. [Figure 15] It is a configuration diagram of the imaging device of the present invention.

Mode for Carrying Out the Invention

[0011] Hereinafter, preferred embodiments of the present invention will be described in detail based on the accompanying drawings. The present invention relates to a zoom lens and an imaging device having the same, and particularly to a zoom lens suitable for a cinema camera, a broadcast camera, a video camera, a surveillance camera, a digital still camera, a silver halide photographic camera, etc., and an imaging device having the same.

[0012] The zoom lens of the present invention has a first lens group with a positive refractive power that does not move for zooming, at least three lens groups that move during zooming, and a final lens group with a positive refractive power, which are arranged in order from the object side to the image side. The distance between adjacent lens groups changes during zooming. The aperture stop is arranged within the final lens group or adjacent to the final lens group. Among the positive lenses of the first lens group, let the refractive index of the lens closest to the object side be np, the Abbe number at the d-line be νp, the focal length of the first lens group be f1, the focal length of the zoom lens at the wide-angle end be fw, the focal length of the zoom lens at the telephoto end be ft, and the back focus of the zoom lens at the wide-angle end be BF. 1.,86 ≦ np ≦ 2.15 ···(1) 15.0 ≦ νp ≦ 22.0 ···(2) 2.35 ≦ ft / f1 ≦ 6.00 ···(3) 0.28 ≦ fw / BF ≦ 0.43 ···(4) It satisfies the conditional expressions.

[0013] Here, the Abbe number v (referenced to the d line) in the d line is given by the refractive indices of the Fraunhofer lines d line (587.6 nm), F line (486.1 nm), and C line (656.3 nm), respectively, where Nd, NF, and NC are the refractive indices. v = (Nd-1) / (NF-NC) It is represented as follows.

[0014] Conditional equations (1) and (2) define the characteristics of the optical glass of the lens closest to the object among the positive lenses of the first lens group. By using optical glass that satisfies conditions (1) and (2), it is possible to suppress chromatic aberration, zoom fluctuations, and focus fluctuations.

[0015] Condition (3) specifies the ratio of the focal length at the telephoto end of the zoom lens to the focal length of the first lens group. Satisfying condition (3) allows for a configuration advantageous for a high zoom ratio. If the upper limit of condition (3) is not met, the magnification of aberrations in the first lens group increases, making it difficult to suppress various aberrations. If the lower limit of condition (3) is not met, it becomes difficult to achieve a high zoom ratio.

[0016] Condition (4) defines the ratio of the wide-angle end of the zoom lens to the back focus of the zoom lens at the wide-angle end. Satisfying condition (4) allows for a configuration that is advantageous for wide-angle lenses. If the upper limit of condition (4) is not met, it becomes difficult to achieve a wide-angle lens. If the lower limit of condition (4) is not met, the zoom lens becomes excessively wide-angle, making it difficult to suppress various aberrations.

[0017] In a further embodiment of the zoom lens of the present invention, the first lens group comprises a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power, and a third sub-lens group with positive refractive power, arranged sequentially from the object side to the image side. The spacing between adjacent sub-lens groups changes for focusing. Preferably, the first sub-lens group does not move for focusing, at least the second sub-lens group moves for focusing, and the third sub-lens group does not move for focusing. This configuration is effective in achieving a wide-angle view.

[0018] In a further embodiment of the zoom lens of the present invention, the first sub-lens group is characterized by comprising two or three negative lenses and one positive lens arranged sequentially from the object side to the image side. This configuration makes it possible to make the lens smaller and lighter while suppressing chromatic aberration.

[0019] A further embodiment of the zoom lens of the present invention is characterized in that the third sub-lens group is composed of five or fewer lenses. This configuration makes it possible to make the lens smaller and lighter while suppressing chromatic aberration. Further embodiments of the zoom lens of the present invention are preferably those that satisfy the following condition. -0.0040≦(θ11p_ave-θ11n_ave) / (ν11p_ave-ν11n_ave)≦-0.0020 ···(5) -34.0≦(ν11p_ave-ν11n_ave)≦-21.0 ···(6) -3.00 ≤ fp1 / f11 ≤ -1.90 ···(7) 0.80 ≤ fn1 / f11 ≤ 1.50 ···(8) -1.70 ≤ f11 / f1 ≤ -0.70 ···(9) -0.0022≦(θ13p_ave-θ13n_ave) / (ν13p_ave-ν13n_ave)≦-0.0006 ···(10)

[0020] Here, θ11p_ave and ν11p_ave are the average partial variance ratio and average Abbe number of the positive lenses in the first sub-lens group, respectively. Note that here, the average partial variance ratio and average Abbe number of the positive lenses in the first sub-lens group refer to the partial variance ratio and Abbe number of a single positive lens included in the first sub-lens group. θ11n_ave and ν11n_ave are the average partial variance ratio and average Abbe number of the negative lenses in the first sub-lens group. Also, fp1 is the focal length of the positive lens closest to the object in the first lens group, f11 is the focal length of the first sub-lens group, and fn1 is the focal length of the negative lens closest to the object in the first lens group. θ13p_ave and ν13p_ave are the average partial variance ratio and average Abbe number of the positive lenses in the third sub-lens group, respectively, and θ13n_ave and ν13n_ave are the average partial variance ratio and average Abbe number of the negative lenses in the third sub-lens group.

[0021] Here, the partial dispersion ratio θ (referenced to the g-line and F-line) is given by Ng, NF, and NC for the refractive indices of the Fraunhofer lines g-line (435.8 nm), F-line (486.1 nm), and C-line (656.3 nm), respectively. θ = (Ng - NF) / (NF - NC) It is represented as follows.

[0022] Condition (5) specifies the residual secondary spectrum of chromatic aberration in the first sub-lens group. If the upper limit of condition (5) is not met, the secondary spectrum of lateral chromatic aberration at the telephoto end will be undercorrected, making it difficult to properly correct chromatic aberration throughout the entire zoom range. If the lower limit of condition (5) is not met, the secondary spectrum of lateral chromatic aberration at the telephoto end will be overcorrected, which is undesirable.

[0023] Condition (6) specifies the conditions for achromatic correction in the first sub-lens group. If the upper limit of condition (6) is not met, the refractive power of each lens in the first sub-lens group will decrease, making chromatic aberration correction difficult. If the lower limit of condition (6) is not met, achromatic correction will be insufficient, making it particularly difficult to reduce lateral chromatic aberration on the wide-angle side.

[0024] Condition (7) specifies the ratio of the focal length of the positive lens closest to the object in the first lens group to the focal length of the first sub-lens group. If the upper limit of condition (7) is not met, the refractive power of the positive lens closest to the object in the first lens group becomes too weak, making chromatic aberration correction difficult. If the lower limit of condition (7) is not met, the refractive power of the positive lens closest to the object in the first lens group becomes too strong, making it difficult to correct various aberrations.

[0025] Condition (8) specifies the ratio of the focal length of the negative lens closest to the object in the first lens group to the focal length of the first sub-lens group. If the upper limit of condition (8) is not met, the refractive power of the negative lens closest to the object in the first lens group becomes too weak, making chromatic aberration correction difficult. If the lower limit of condition (8) is not met, the refractive power of the negative lens closest to the object in the first lens group becomes too strong, making it difficult to correct various aberrations.

[0026] Condition (9) specifies the ratio of the focal length of the first sub-lens group to the focal length of the first lens group. If the upper limit of condition (9) is not met, the focal length of the first sub-lens group becomes too short, making it difficult to suppress the fluctuations of off-axis aberrations associated with wide-angle zooming. If the lower limit of condition (9) is not met, the focal length of the first lens group becomes too long, increasing the lens diameter of the first lens group and making wide-angle zooming difficult.

[0027] Condition (10) specifies the residual secondary spectral chromatic aberration of the third sub-lens group. If the upper limit of condition (10) is not met, the correction of the secondary spectral chromatic aberration becomes excessive. If the lower limit of condition (10) is not met, the correction of the secondary spectral chromatic aberration becomes insufficient, and chromatic aberration remains. Furthermore, it is preferable to set the numerical ranges of conditional expressions (1) to (10) as follows. 1.87 ≤ np ≤ 2.10 ···(1a) 16.0 ≤ νp ≤ 21.5 ···(2a) 2.39≦ft / f1≦5.60 (3a) 0.30≦fw / BF≦0.42 (4a) -0.0038≦(θ11p_ave-θ11n_ave) / (ν11p_ave-ν11n_ave)≦-0.0022 ···(5a) -32.0≦(ν11p_ave-ν11n_ave)≦-22.5···(6a) -2.95≦fp1 / f11≦-1.95 (7a) 0.85≦fn1 / f11≦1.45 (8a) -1.60≦f11 / f1≦-0.80 (9a) -0.0020≦(θ13p_ave-θ13n_ave) / (ν13p_ave-ν13n_ave)≦-0.0008 ···(10a) More preferably, the numerical ranges of the conditional expressions (1a) to (10a) should be set as follows. 1.88 ≤ np ≤ 2.05 ···(1b) 17.0 ≤ νp ≤ 21.0 ···(2b) 2.43≦ft / f1≦5.20 (3b) 0.32≦fw / BF≦0.41 (4b) -0.0036≦(θ11p_ave-θ11n_ave) / (ν11p_ave-ν11n_ave)≦-0.0024 ···(5b) -30.0≦(ν11p_ave-ν11n_ave)≦-24.0···(6b) -2.90≦fp1 / f11≦-2.00 (7b) 0.90≦fn1 / f11≦1.40 (8b) -1.50≦f11 / f1≦-0.90 (9b) -0.0018≦(θ13p_ave-θ13n_ave) / (ν13p_ave-ν13n_ave)≦-0.0010 ···(10b)

[0028] Furthermore, the imaging device of the present invention is characterized by having a zoom lens of each embodiment and an image sensor having a predetermined effective imaging range for receiving the image formed by the zoom lens. Next, the characteristics of each embodiment will be described. [Examples]

[0029] The zoom lens of Embodiment 1 of the present invention has the following configuration from the object side to the image side: a first lens group L1 with positive refractive power that does not move for zooming, a second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a fifth lens group L5 which is the final lens group with positive refractive power for image formation.

[0030] Figure 1 is a cross-sectional view of the zoom lens of Embodiment 1 of the present invention when it is focused on an object at infinity at its wide-angle end. Figure 2 is an aberration diagram when it is focused on an object at infinity at its wide-angle end (A) and when it is focused on an object at infinity at its telephoto end (B). The zoom lens in each embodiment is an imaging optical system used in an imaging device, and in the cross-sectional view of the lens, the left side is the subject side (object side) and the right side is the image side.

[0031] In each aberration diagram, the solid, dashed, single-dot, and dashed lines in the spherical aberration diagram represent the d, g, C, and F lines, respectively. The solid and dashed lines in the astigmatism diagram represent the sagittal image plane (ΔS) and meridional image plane (ΔM), respectively, and the dashed, single-dot, and dashed lines in the chromatic aberration diagram represent the g, C, and F lines, respectively. The astigmatism and chromatic aberration diagrams show the amount of aberration when the light ray passing through the center of the light beam at the aperture position is considered the principal ray.

[0032] ω is the half-angle of view in the paraxial direction, and Fno is the F-number. In the longitudinal aberration diagram, spherical aberration is depicted on a scale of 0.2 mm, astigmatism on 0.2 mm, distortion on 5%, and chromatic aberration on 0.05 mm. In each of the following embodiments, the wide-angle end and telephoto end refer to the zoom positions when the second lens group is located at both ends of the range in which it can move along the optical axis due to the mechanism. The explanations of these lens cross-sectional diagrams and aberration diagrams are the same in all subsequent embodiments unless otherwise specified.

[0033] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves during zooming and has negative refractive power. The fourth lens group L4 moves during zooming and has positive refractive power. SP is the aperture diaphragm. The fifth lens group L5 is a lens group with positive refractive power that does not move for zooming. An extender lens for focal length conversion may be installed within the fifth lens group L5. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens. [Examples]

[0034] The zoom lens of Embodiment 2 of the present invention has the following configuration from the object side to the image side: a first lens group L1 with positive refractive power that does not move for zooming, a second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a fifth lens group L5 which is the final lens group with positive refractive power for image formation.

[0035] Figure 3 is a cross-sectional view of the zoom lens of Embodiment 2 of the present invention when it is focused on an object at infinity at the wide-angle end. Figure 4 is an aberration diagram when it is focused on an object at infinity at the wide-angle end (A) and when it is focused on an object at infinity at the telephoto end (B).

[0036] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves during zooming and has negative refractive power. The fourth lens group L4 has positive refractive power and moves together with the aperture diaphragm SP during zooming. The fifth lens group L5 is a lens group with positive refractive power that does not move for zooming. An extender lens for focal length conversion may be installed within the fifth lens group L5. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens. [Examples]

[0037] The zoom lens of Embodiment 3 of the present invention has the following configuration from the object side to the image side: a first lens group L1 with positive refractive power that does not move for zooming, a second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a fifth lens group L5 which is the final lens group with positive refractive power for image formation.

[0038] Figure 5 is a cross-sectional view of the zoom lens of Embodiment 3 of the present invention when it is in focus on an object at infinity at the wide-angle end. Figure 6 is an aberration diagram when it is in focus on an object at infinity at the wide-angle end (A) and when it is in focus on an object at infinity at the telephoto end (B).

[0039] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves during zooming and has negative refractive power. The fourth lens group L4 moves during zooming and has positive refractive power. The aperture diaphragm SP moves during zooming. The fifth lens group L5 is a lens group with positive refractive power that does not move for zooming. An extender lens for focal length conversion may be installed within the fifth lens group L5. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens. [Examples]

[0040] The zoom lens of Embodiment 4 of the present invention has the following configuration 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 second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with negative refractive power that moves during zooming, a fifth lens group L5 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a sixth lens group L6 which is the final lens group with positive refractive power for image formation.

[0041] Figure 7 is a cross-sectional view of the zoom lens of Embodiment 4 of the present invention when it is in focus on an object at infinity at the wide-angle end. Figure 8 is an aberration diagram when it is in focus on an object at infinity at the wide-angle end (A) and when it is in focus on an object at infinity at the telephoto end (B).

[0042] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 moves during zooming and has negative refractive power. The third lens group L3 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 moves during zooming and has negative refractive power. The fifth lens group L5 has positive refractive power. SP is the aperture diaphragm. The sixth lens group L6 is a lens group with positive refractive power that does not move for zooming. An extender lens for focal length conversion may be installed within the sixth lens group L6. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens. [Examples]

[0043] The zoom lens of Embodiment 5 of the present invention has the following configuration from the object side to the image side: a first lens group L1 with positive refractive power that does not move for zooming, a second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a fifth lens group L5 which is the final lens group with positive refractive power for image formation.

[0044] Figure 9 is a cross-sectional view of the zoom lens of Embodiment 5 of the present invention when it is in focus on an object at infinity at the wide-angle end. Figure 10 is an aberration diagram when it is in focus on an object at infinity at the wide-angle end (A) and when it is in focus on an object at infinity at the telephoto end (B).

[0045] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves during zooming and has negative refractive power. The fourth lens group L4 moves during zooming and has positive refractive power. SP is the aperture diaphragm. The fifth lens group L5 is a lens group that moves during zooming and has positive refractive power. An extender lens for focal length conversion may be installed within the fifth lens group L5. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens. [Examples]

[0046] The zoom lens of Embodiment 6 of the present invention has the following configuration from the object side to the image side: a first lens group L1 with positive refractive power that does not move for zooming, a second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with negative refractive power that moves during zooming, a fifth lens group L5 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a sixth lens group L6 which is the final lens group with positive refractive power for image formation.

[0047] Figure 11 is a cross-sectional view of the zoom lens of Embodiment 6 of the present invention when it is in focus on an object at infinity at the wide-angle end. Figure 12 is an aberration diagram when it is in focus on an object at infinity at the wide-angle end (A) and when it is in focus on an object at infinity at the telephoto end (B).

[0048] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves during zooming and has negative refractive power. The fourth lens group L4 moves during zooming and has negative refractive power. The fifth lens group L5 moves during zooming and has positive refractive power. SP is the aperture diaphragm. The sixth lens group L6 is a lens group with positive refractive power that does not move for zooming. An extender lens for focal length conversion may be installed within the sixth lens group L6. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens. [Examples]

[0049] The zoom lens of the numerical embodiment 7 of the present invention has the following configuration from the object side to the image side: a first lens group L1 with positive refractive power that does not move for zooming, a second lens group L2 with negative refractive power that moves during zooming, a third lens group L3 with negative refractive power that moves during zooming, a fourth lens group L4 with positive refractive power that moves during zooming, an aperture diaphragm SP, and a fifth lens group L5 which is the final lens group with positive refractive power for image formation.

[0050] Figure 13 is a cross-sectional view of the zoom lens of Embodiment 7 of the present invention when it is in focus on an object at infinity at the wide-angle end. Figure 14 is an aberration diagram when it is in focus on an object at infinity at the wide-angle end (A) and when it is in focus on an object at infinity at the telephoto end (B).

[0051] The first lens group L1 does not move for zooming and has positive refractive power. The first lens group L1 comprises, in order from the object side to the image side, the first sub-lens group L11 with negative refractive power, the second sub-lens group L12 with positive refractive power, and the third sub-lens group L13 with positive refractive power. The second sub-lens group L12 is a focusing lens group that moves from the object side to the image side when adjusting focus from infinity to a finite distance. The second lens group L2 is a variator lens group with negative refractive power that moves towards the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 moves during zooming and has negative refractive power. The fourth lens group L4 moves during zooming and has positive refractive power. SP is the aperture diaphragm. The fifth lens group L5 is a lens group with positive refractive power that does not move for zooming. An extender lens for focal length conversion may be installed within the fifth lens group L5. I is the image plane, which corresponds to the imaging surface of the image sensor (photoelectric conversion element such as CCD or CMOS) that receives the optical image formed by the zoom lens.

[0052] Next, numerical examples 1 to 7 corresponding to Examples 1 to 7 of the present invention are shown. In each numerical example, i indicates the order of the surfaces from the object side. ri is the radius of curvature of the i-th lens surface in order from the object side to the image side, di is the lens thickness and air gap between the i-th lens surface and the (i+1)-th lens surface in order from the object side to the image side, ndi, νdi, and θgFi are the refractive index (d line), Abbe number (d line reference), and partial dispersion ratio (g line and F line reference) of the lens material between the i-th lens surface and the (i+1)-th lens surface, respectively, in order from the object side. BF is the back focus, indicating the distance from the final lens surface to the image surface in terms of air. The total lens length is the distance from the first lens surface to the final lens surface plus the back focus. The aspherical shape is given by the following equation, where the X-axis is in the direction of the optical axis, the H-axis is perpendicular to the optical axis, the direction of light propagation is positive, R is the radius of paraxial curvature, k is the cone constant, and A3, A4, A5, A6, A7, A8, A9, A10, A11, A12, A13, A14, A15, and A16 are the aspherical coefficients, respectively.

number

[0053] In each aspherical shape, [eX] is [×10 -X This means [the angle of view]. In addition to specifications such as focal length and F-number, it shows the half-angle of view of the entire zoom lens system. The data for each lens group shows the focal length of each lens group. The parts where the spacing d of each optical surface is (variable) change during zooming, and the surface spacing according to the focal length is shown in a separate table.

[0054] <Numerical Example 1> Unit: mm Surface data Face number rd nd vd θgf 1* 4757.030 2.80 1.80100 35.0 0.5864 2 43.063 27.48 3 -75.597 2.20 1.63854 55.4 0.5484 4 239.886 0.15 5 157.499 7.69 1.95906 17.5 0.6598 6 -383.207 1.13 7 200.472 13.03 1.53775 74.7 0.5392 8* -92.576 5.51 9 270.694 10.71 1.48749 70.2 0.5300 10 -95.188 2.10 1.84666 23.8 0.6205 11 -199.911 0.20 12 145.369 2.10 1.80518 25.4 0.6161 13 56.865 13.53 1.43875 94.7 0.5340 14 -1365.080 0.20 15 206.147 6.00 1.43387 95.1 0.5373 16 -334.432 0.20 17 186.419 8.81 1.76385 48.5 0.5589 18 -138.559 (variable) 19* 113.971 1.25 2.00100 29.1 0.5997 20 24.186 6.46 21 -41.222 0.90 1.59522 67.7 0.5442 22 30.642 6.03 1.85478 24.8 0.6122 23 -62.383 3.17 24 -25.353 0.90 1.83481 42.7 0.5648 25 -44.360 (variable) 26 -37.021 0.90 1.60300 65.4 0.5401 27 98.137 2.03 1.85478 24.8 0.6122 28 728.324 (variable) 29* 70.998 6.13 1.90525 35.0 0.5848 30 -103.934 0.20 31 -315.843 1.20 1.95375 32.3 0.5905 32 166.347 3.47 1.61800 63.3 0.5441 33 -137.368 (variable) 34 (aperture) ∞ 1.80 35 168.020 1.80 2.00100 29.1 0.5997 36 49.624 8.61 1.49700 81.5 0.5375 37 -58.231 0.20 38 88.195 6.21 1.51633 64.1 0.5353 39 -53.581 2.00 1.83481 42.7 0.5648 40 243.630 41.99 41 64.451 8.16 1.43875 94.7 0.5340 42 -49.102 4.20 43 255.432 7.95 1.80810 22.8 0.6307 44 -35.562 1.10 2.00100 29.1 0.5997 45 -1466.352 1.00 46 161.235 10.33 1.51742 52.4 0.5564 47 -26.752 1.20 1.89190 37.1 0.5780 48 51.269 0.72 49 37.558 10.15 1.48749 70.2 0.5300 50 -58.875 42.54 Image plane ∞ Aspherical data Front page K =-2.00000e+00 A 4= 9.46087e-07 A 6= 1.98046e-09 A 8= 6.52397e-12 A10= 8.28901e-15 A12=-1.35643e-19 A14=-1.86398e-21 A16=-5.54763e-26 A 3=-1.81264e-06 A 5=-2.33898e-08 A 7=-1.25328e-10 A 9=-2.69889e-13 A11=-1.52146e-16 A13= 8.26328e-20 A15= 1.72135e-23 Side 8 K =-1.02997e+00 A 4= 5.48630e-07 A 6= 2.34979e-10 A 8=-1.89359e-15 A10=-6.91188e-16 A12=-7.25113e-20 A 3=-3.10939e-07 A 5=-1.89555e-09 A 7=-1.00407e-11 A 9= 1.71125e-14 A11= 1.12862e-17 Page 19 K =-2.00013e+00 A 4= 4.92053e-06 A 6=-5.35701e-08 A 8=-2.79944e-09 A10=-1.33097e-11 A12=-3.74615e-15 A 3=-1.29064e-06 A 5=-9.34903e-08 A 7= 1.78894e-08 A 9= 2.53904e-10 A11= 3.63938e-13 Page 29 K = 8.99851e-01 A 4=-2.76907e-06 A 6=-1.06240e-07 A 8=-2.88426e-09 A10=-1.28512e-11 A12= 1.83249e-15 A14= 1.77924e-17 A16= 3.66574e-21 A 3=-3.97104e-07 A 5= 2.76818e-07 A 7= 2.21858e-08 A 9= 2.43469e-10 A11= 3.46270e-13 A13=-4.90518e-16 A15=-3.48843e-19 Various data Zoom ratio 7.79 Wide-angle, Medium, Telephoto Focal length 15.40 45.00 120.00 F-numbers: 2.72, 2.71, 3.65 Half-angle 43.86 18.21 7.03 Image height 14.80 14.80 14.80 Lens length 347.55 347.55 347.55 BF 42.54 42.54 42.54 d18 1.15 37.22 55.04 d25 39.95 4.59 3.36 d28 10.52 14.59 0.79 d33 9.50 4.72 1.92 Zoom lens group data Group starting plane focal length 1 1 46.81 2 19 -24.89 3 26 -67.11 4 29 49.01 5 34 96.11

[0055] <Numerical Example 2> Unit: mm Surface data Face number rd nd vd θgf 1* -89413.671 2.80 1.79360 37.1 0.5828 2 43.169 29.32 3 -85.464 2.20 1.64000 60.1 0.5370 4 207.517 0.15 5 149.813 8.99 1.92286 18.9 0.6495 6 -350.031 1.13 7 188.369 13.87 1.49700 81.5 0.5375 8* -94.494 10.34 9 328.251 9.69 1.48749 70.2 0.5300 10 -147.291 2.10 1.84666 23.8 0.6205 11 -183.332 0.20 12 359.780 2.10 1.84666 23.8 0.6205 13 59.688 13.61 1.49700 81.5 0.5375 14 -470.525 0.20 15 187.907 9.01 1.43875 94.7 0.5340 16 -183.294 2.00 17 137.951 10.99 1.76385 48.5 0.5589 18 -164.814 (variable) 19* 111.441 1.25 2.00100 29.1 0.5997 20 24.326 6.93 21 -36.958 0.90 1.59522 67.7 0.5442 22 30.033 8.62 1.85478 24.8 0.6122 23 -52.167 3.60 24 -26.178 0.90 1.83481 42.7 0.5648 25 -62.620 (variable) 26 -37.952 0.90 1.60300 65.4 0.5401 27 102.754 2.05 1.85478 24.8 0.6122 28 3587.812 (variable) 29* 57.540 8.76 1.90525 35.0 0.5848 30 -123.886 0.20 31 717.433 1.20 1.95375 32.3 0.5905 32 62.604 5.99 1.61800 63.3 0.5441 33 -441.313 3.00 34 (aperture) ∞ (variable) 35 165.568 1.80 2.00100 29.1 0.5997 36 54.607 7.28 1.49700 81.5 0.5375 37 -61.491 0.90 38 102.223 9.26 1.51633 64.1 0.5353 39 -44.173 1.11 1.83481 42.7 0.5648 40 287.865 37.96 41 57.232 10.58 1.43875 94.7 0.5340 42 -48.113 4.16 43 157.256 8.88 1.80810 22.8 0.6307 44 -30.967 1.10 2.00100 29.1 0.5997 45 451.915 1.00 46 176.815 8.41 1.51742 52.4 0.5564 47 -25.166 1.20 1.89190 37.1 0.5780 48 58.270 0.91 49 37.662 11.12 1.48749 70.2 0.5300 50 -58.875 40.24 Image plane ∞ Aspherical data Front page K = 3.46351e+06 A 4= 8.89298e-07 A 6= 2.22014e-09 A 8= 6.64596e-12 A10= 8.25887e-15 A12=-1.29611e-19 A14=-1.86084e-21 A16=-5.65689e-26 A 3=-1.04177e-06 A 5=-2.67053e-08 A 7=-1.32296e-10 A 9=-2.69735e-13 A11=-1.52521e-16 A13= 8.27153e-20 A15= 1.72111e-23 Side 8 K =-4.11347e-01 A 4= 7.73068e-07 A 6= 1.98062e-10 A 8=-3.68208e-13 A10=-1.32661e-15 A12=-1.29935e-19 A 3= 7.84263e-08 A 5=-1.05783e-09 A 7=-7.44048e-12 A 9= 3.86879e-14 A11= 2.08018e-17 Page 19 K =-1.63671e+01 A 4= 5.01302e-06 A 6=-4.33711e-08 A 8=-2.43207e-09 A10=-1.48570e-11 A12=-4.67044e-15 A 3= 3.47434e-07 A 5= 4.42491e-08 A 7= 1.34016e-08 A 9= 2.54880e-10 A11= 4.35183e-13 Page 29 K =-5.68897e-01 A 4=-2.11632e-06 A 6=-1.12321e-07 A 8=-2.93486e-09 A10=-1.28336e-11 A12= 1.89637e-15 A14= 1.73771e-17 A16= 2.45582e-21 A 3=-9.14979e-07 A 5= 2.56470e-07 A 7= 2.32919e-08 A 9= 2.42773e-10 A11= 3.52411e-13 A13=-5.09488e-16 A15=-2.88355e-19 Various data Zoom ratio 7.38 Focal length 15.83 43.95 116.78 F-number 2.72 2.72 3.65 Half-angle 43.07 18.61 7.22 Image height 14.80 14.80 14.80 Lens length 360.75 360.75 360.75 BF 40.24 40.24 40.24 d18 1.50 29.82 43.81 d25 32.90 4.07 3.25 d28 13.46 16.48 0.80 d34 4.00 1.49 4.00 Zoom lens group data Group starting plane focal length 1 1 39.01 2 19 -22.42 3 26 -73.20 4 29 49.90 5 35 99.64

[0056] <Numerical Example 3> Unit: mm Surface data Face number rd nd vd θgf 1* 802.648 2.80 1.80100 35.0 0.5864 2 42.334 28.82 3 -70.803 2.20 1.63854 55.4 0.5484 4 253.576 0.15 5 162.711 7.81 1.95906 17.5 0.6598 6 -378.441 1.38 7 193.823 15.69 1.53775 74.7 0.5392 8* -92.436 6.03 9 331.302 11.96 1.48749 70.2 0.5300 10 -88.518 2.10 1.84666 23.8 0.6205 11 -167.390 0.20 12 129.429 2.10 1.80518 25.4 0.6161 13 56.391 11.08 1.43875 94.7 0.5340 14 282.158 0.20 15 164.743 7.14 1.43387 95.1 0.5373 16 -264.424 0.20 17 216.988 8.39 1.76385 48.5 0.5589 18 -139.131 (variable) 19* 67.940 1.25 2.00100 29.1 0.5997 20 23.570 7.12 21 -41.938 0.90 1.59522 67.7 0.5442 22 29.876 5.75 1.85478 24.8 0.6122 23 -80.323 2.45 24 -25.598 0.90 1.83481 42.7 0.5648 25 -44.148 (variable) 26 -38.333 0.90 1.60300 65.4 0.5401 27 110.410 3.01 1.85478 24.8 0.6122 28 1191.968 (variable) 29* 72.032 5.30 1.90525 35.0 0.5848 30 -145.830 0.20 31 -314.945 1.20 1.95375 32.3 0.5905 32 447.811 3.56 1.61800 63.3 0.5441 33 -111.378 (variable) 34 (aperture) ∞ (variable) 35 167.521 1.10 2.00100 29.1 0.5997 36 47.984 8.31 1.49700 81.5 0.5375 37 -65.103 0.57 38 97.838 6.56 1.51633 64.1 0.5353 39 -51.367 1.10 1.83481 42.7 0.5648 40 520.552 46.29 41 71.881 8.00 1.43875 94.7 0.5340 42 -50.471 4.20 43 109.502 9.45 1.80810 22.8 0.6307 44 -37.460 1.10 2.00100 29.1 0.5997 45 116.922 0.99 46 86.066 11.09 1.51742 52.4 0.5564 47 -25.435 1.20 1.89190 37.1 0.5780 48 52.611 1.94 49 39.946 8.80 1.48749 70.2 0.5300 50 -50.176 40.10 Image plane ∞ Aspherical data Front page K =-1.07693e+03 A 4= 1.12115e-06 A 6= 1.91940e-09 A 8= 6.59131e-12 A10= 8.27377e-15 A12=-1.35783e-19 A14=-1.86448e-21 A16=-5.53455e-26 A 3=-1.50134e-06 A 5=-2.59911e-08 A 7=-1.25281e-10 A 9=-2.69925e-13 A11=-1.52237e-16 A13= 8.26987e-20 A15= 1.72102e-23 Side 8 K =-5.61776e-01 A 4= 6.01042e-07 A 6= 4.01879e-10 A 8= 2.18544e-13 A10=-8.57671e-16 A12=-1.01545e-19 A 3=-2.02504e-07 A 5=-3.58450e-09 A 7=-1.86015e-11 A 9= 1.73697e-14 A11= 1.51797e-17 Page 19 K =-2.92314e+00 A 4= 5.28329e-06 A 6=-5.13287e-08 A 8=-2.68675e-09 A10=-1.33504e-11 A12=-3.61948e-15 A 3=-2.04612e-06 A 5=-8.07752e-08 A 7= 1.71289e-08 A 9= 2.48784e-10 A11= 3.67585e-13 Page 29 K = 1.85043e+00 A 4=-2.62570e-06 A 6=-1.00120e-07 A 8=-2.83515e-09 A10=-1.28862e-11 A12= 1.83187e-15 A14= 1.77472e-17 A16= 3.41386e-21 A 3= 7.03908e-08 A 5= 2.56255e-07 A 7= 2.14014e-08 A 9= 2.42290e-10 A11= 3.48440e-13 A13=-4.91305e-16 A15=-3.42057e-19 Various data Zoom ratio 7.47 Wide-angle, Medium, Telephoto Focal length 15.91 45.76 118.84 F-number 2.72 2.72 3.65 Half-angle 42.93 17.92 7.10 Image height 14.80 14.80 14.80 Lens length 356.08 356.08 356.08 d18 1.50 38.75 57.16 d25 44.44 6.63 2.19 d28 11.81 16.16 2.81 d33 4.71 0.59 0.50 d34 2.00 2.34 1.81 Zoom lens group data Group starting plane focal length 1 1 48.43 2 19 -26.49 3 26 -70.58 4 29 49.92 5 34 ∞ 6 35 109.30

[0057] <Numerical Example 4> Unit: mm Surface data Face number rd nd vd θgf 1* 6717.361 2.80 1.80100 35.0 0.5864 2 43.080 27.75 3 -76.176 2.20 1.63854 55.4 0.5484 4 241.633 0.15 5 158.849 7.85 1.95906 17.5 0.6598 6 -380.261 1.13 7 198.447 13.49 1.53775 74.7 0.5392 8* -92.893 5.48 9 259.763 10.83 1.48749 70.2 0.5300 10 -95.738 2.10 1.84666 23.8 0.6205 11 -197.444 0.20 12 144.348 2.10 1.80518 25.4 0.6161 13 56.582 14.65 1.43875 94.7 0.5340 14 -1244.830 0.23 15 206.292 6.00 1.43387 95.1 0.5373 16 -305.416 0.20 17 184.879 8.81 1.76385 48.5 0.5589 18 -141.503 (variable) 19 167.429 0.75 1.43875 94.7 0.5340 20 137.803 (variable) 21* 114.833 1.25 2.00100 29.1 0.5997 22 24.474 6.38 23 -42.263 0.90 1.59522 67.7 0.5442 24 30.711 6.01 1.85478 24.8 0.6122 25 -64.041 3.28 26 -25.593 0.90 1.83481 42.7 0.5648 27 -44.434 (variable) 28 -36.740 0.90 1.60300 65.4 0.5401 29 95.097 2.06 1.85478 24.8 0.6122 30 620.857 (variable) 31* 70.616 6.23 1.90525 35.0 0.5848 32 -102.845 0.20 33 -306.251 1.20 1.95375 32.3 0.5905 34 158.937 3.53 1.61800 63.3 0.5441 35 -139.595 (variable) 36 (aperture) ∞ 1.80 37 166.159 1.31 2.00100 29.1 0.5997 38 50.551 7.94 1.49700 81.5 0.5375 39 -59.763 1.94 40 88.990 6.26 1.51633 64.1 0.5353 41 -53.141 1.35 1.83481 42.7 0.5648 42 245.485 40.51 43 65.095 8.72 1.43875 94.7 0.5340 44 -47.915 4.15 45 258.388 6.86 1.80810 22.8 0.6307 46 -35.273 1.10 2.00100 29.1 0.5997 47 -1390.050 0.86 48 156.334 10.11 1.51742 52.4 0.5564 49 -26.964 1.20 1.89190 37.1 0.5780 50 50.413 0.51 51 37.472 8.43 1.48749 70.2 0.5300 52 -58.875 44.74 Image plane ∞ Aspherical data Front page K = 7.00480e+03 A 4= 9.51609e-07 A 6= 1.97580e-09 A 8= 6.52069e-12 A10= 8.28787e-15 A12=-1.34742e-19 A14=-1.86371e-21 A16=-5.56733e-26 A 3=-1.86549e-06 A 5=-2.27145e-08 A 7=-1.25197e-10 A 9=-2.70010e-13 A11=-1.52123e-16 A13= 8.26404e-20 A15= 1.72143e-23 Side 8 K =-9.83875e-01 A 4= 5.58212e-07 A 6= 2.33392e-10 A 8=-1.03515e-14 A10=-6.66003e-16 A12=-6.91678e-20 A 3=-3.49559e-07 A 5=-1.88499e-09 A 7=-9.76444e-12 A 9= 1.68014e-14 A11= 1.07709e-17 Page 21 K =-2.62554e+00 A 4= 4.86589e-06 A 6=-5.09761e-08 A 8=-2.76680e-09 A10=-1.34027e-11 A12=-3.76425e-15 A 3=-1.26397e-06 A 5=-1.07426e-07 A 7= 1.74468e-08 A 9= 2.53890e-10 A11= 3.66950e-13 Page 31 K = 1.08794e+00 A 4=-2.82003e-06 A 6=-1.06778e-07 A 8=-2.88788e-09 A10=-1.28476e-11 A12= 1.81725e-15 A14= 1.78620e-17 A16= 3.62335e-21 A 3=-5.01326e-07 A 5= 2.75020e-07 A 7= 2.22692e-08 A 9= 2.43452e-10 A11= 3.46348e-13 A13=-4.90775e-16 A15=-3.49718e-19 Various data Zoom ratio 7.76 Wide-angle, Medium, Telephoto Focal length 15.44 45.00 119.91 F-numbers: 2.72, 2.71, 3.64 Half-angle 43.78 18.21 7.04 Image height 14.80 14.80 14.80 Lens length 346.95 346.95 346.95 BF 44.74 44.74 44.74 d18 0.20 3.42 5.64 d20 0.20 33.45 49.26 d27 40.04 4.61 3.00 d30 10.98 14.88 1.25 d35 8.15 3.21 0.43 Zoom lens group data Group starting plane focal length 1 1 45.44 2 19 -1788.83 3 21 -25.35 4 28 -66.00 5 31 49.25 6 36 97.09

[0058] <Numerical Example 5> Unit: mm Surface data Face number rd nd vd θgf 1* 4285.116 2.80 1.80100 35.0 0.5864 2 43.111 28.21 3 -76.237 2.20 1.65160 58.5 0.5390 4 279.525 0.15 5 164.506 8.53 1.92286 18.9 0.6495 6 -281.537 1.19 7 166.694 13.07 1.53775 74.7 0.5392 8* -100.923 5.80 9 531.347 8.90 1.49700 81.5 0.5375 10 -103.890 2.10 1.84666 23.8 0.6205 11 -201.170 0.20 12 147.842 2.10 1.80518 25.4 0.6161 13 56.322 15.94 1.43875 94.7 0.5340 14 -550.479 0.32 15 207.639 6.00 1.43387 95.1 0.5373 16 -372.693 0.20 17 179.598 9.13 1.76385 48.5 0.5589 18 -143.920 (variable) 19* 121.430 1.25 2.00100 29.1 0.5997 20 24.227 6.56 21 -38.267 0.90 1.59522 67.7 0.5442 22 31.414 6.27 1.85478 24.8 0.6122 23 -55.567 3.29 24 -25.417 0.90 1.83481 42.7 0.5648 25 -47.052 (variable) 26 -37.893 0.90 1.60300 65.4 0.5401 27 100.502 2.01 1.85478 24.8 0.6122 28 841.240 (variable) 29* 67.881 6.29 1.90525 35.0 0.5848 30 -108.563 0.20 31 -685.341 1.20 1.95375 32.3 0.5905 32 112.917 3.79 1.61800 63.3 0.5441 33 -167.241 (variable) 34 (aperture) ∞ (variable) 35 192.230 1.10 2.00100 29.1 0.5997 36 50.304 7.56 1.49700 81.5 0.5375 37 -60.931 0.20 38 88.541 7.48 1.51633 64.1 0.5353 39 -55.347 1.10 1.83481 42.7 0.5648 40 301.445 40.10 41 64.523 10.29 1.43875 94.7 0.5340 42 -48.277 3.78 43 255.324 9.15 1.80810 22.8 0.6307 44 -32.994 1.10 2.00100 29.1 0.5997 45 -867.994 0.56 46 246.285 9.44 1.51742 52.4 0.5564 47 -26.537 1.20 1.89190 37.1 0.5780 48 55.100 0.33 49 37.785 10.52 1.48749 70.2 0.5300 50 -58.875 (variable) Image plane ∞ Aspherical data Front page K =-1.23333e+04 A 4= 1.03878e-06 A 6= 2.03662e-09 A 8= 6.59393e-12 A10= 8.26671e-15 A12=-1.36697e-19 A14=-1.86118e-21 A16=-5.61574e-26 A 3=-1.92338e-06 A 5=-2.62098e-08 A 7=-1.28131e-10 A 9=-2.69365e-13 A11=-1.52440e-16 A13= 8.27659e-20 A15= 1.71979e-23 Side 8 K =-1.36638e+00 A 4= 5.95820e-07 A 6= 1.55305e-10 A 8=-2.13020e-13 A10=-6.36877e-16 A12=-5.69187e-20 A 3=-3.49728e-07 A 5=-1.84810e-09 A 7=-4.73093e-12 A 9= 1.98005e-14 A11= 9.42489e-18 Page 19 K = 6.80194e+00 A 4= 4.32994e-06 A 6=-5.15073e-08 A 8=-2.76282e-09 A10=-1.33228e-11 A12=-3.70494e-15 A 3=-8.34104e-07 A 5=-9.58806e-08 A 7= 1.75022e-08 A 9= 2.52526e-10 A11= 3.64692e-13 Page 29 K = 1.17021e+00 A 4=-2.88586e-06 A 6=-1.05443e-07 A 8=-2.87726e-09 A10=-1.28443e-11 A12= 1.85569e-15 A14= 1.77961e-17 A16= 3.70102e-21 A 3=-5.54569e-07 A 5= 2.61702e-07 A 7= 2.21624e-08 A 9= 2.42839e-10 A11= 3.46692e-13 A13=-4.91497e-16 A15=-3.50323e-19 Various data Zoom ratio 7.92 Wide-angle, Medium, Telephoto Focal length 15.36 44.88 121.73 F-numbers: 2.72, 2.71, 3.65 Half-angle 43.93 18.25 6.93 Image height 14.80 14.80 14.80 Lens length 351.73 351.73 351.73 BF 41.87 42.10 42.56 d18 1.19 36.22 53.53 d25 38.82 4.06 3.05 d28 11.04 15.32 0.80 d33 9.49 4.96 3.18 d34 5.00 4.77 4.31 d50 41.87 42.10 42.56 Zoom lens group data Group starting plane focal length 1 1 45.55 2 19 -24.11 3 26 -69.32 4 29 48.75 5 34 ∞ 6 35 98.09

[0059] <Numerical Example 6> Unit: mm Surface data Face number rd nd vd θgf 1* 31009.925 2.80 1.80100 35.0 0.5864 2 43.248 28.09 3 -75.259 2.20 1.65160 58.5 0.5390 4 319.253 0.15 5 168.188 8.84 1.89286 20.4 0.6393 6 -235.321 1.13 7 154.953 13.15 1.53775 74.7 0.5392 8* -104.494 6.03 9 962.112 7.69 1.43875 94.7 0.5340 10 -112.855 2.10 1.85478 24.8 0.6122 11 -195.432 0.20 12 149.662 2.10 1.80518 25.4 0.6161 13 56.047 15.24 1.43875 94.7 0.5340 14 -595.811 0.52 15 189.224 6.89 1.43387 95.1 0.5373 16 -418.849 0.20 17 177.934 8.70 1.76385 48.5 0.5589 18 -146.341 (variable) 19* 118.284 1.25 2.00100 29.1 0.5997 20 24.302 6.57 21 -38.096 0.90 1.59522 67.7 0.5442 22 32.271 5.94 1.85478 24.8 0.6122 23 -59.594 (variable) 24 -24.804 0.90 1.83481 42.7 0.5648 25 -39.952 (variable) 26 -36.316 0.90 1.60300 65.4 0.5401 27 89.118 2.11 1.85478 24.8 0.6122 28 547.801 (variable) 29* 68.309 6.83 1.90525 35.0 0.5848 30 -112.002 0.20 31 -525.814 1.20 1.95375 32.3 0.5905 32 130.251 3.66 1.61800 63.3 0.5441 33 -160.400 (variable) 34 (aperture) ∞ 1.80 35 177.658 1.80 2.00100 29.1 0.5997 36 51.018 11.07 1.49700 81.5 0.5375 37 -59.460 0.20 38 100.498 9.14 1.51633 64.1 0.5353 39 -50.019 1.10 1.83481 42.7 0.5648 40 674.822 41.24 41 64.337 8.11 1.43875 94.7 0.5340 42 -48.022 2.73 43 273.905 8.80 1.80810 22.8 0.6307 44 -35.243 1.10 2.00100 29.1 0.5997 45 -1291.761 0.71 46 211.047 8.98 1.51742 52.4 0.5564 47 -26.335 1.20 1.89190 37.1 0.5780 48 52.567 0.41 49 37.385 11.11 1.48749 70.2 0.5300 50 -58.875 42.99 Image plane ∞ Aspherical data Front page K = 3.99787e+05 A 4= 1.03414e-06 A 6= 1.93082e-09 A 8= 6.60034e-12 A10= 8.26805e-15 A12=-1.38059e-19 A14=-1.86068e-21 A16=-5.61800e-26 A 3=-1.66838e-06 A 5=-2.38278e-08 A 7=-1.27098e-10 A 9=-2.69268e-13 A11=-1.52572e-16 A13= 8.28003e-20 A15= 1.71920e-23 Side 8 K =-1.20590e+00 A 4= 6.04613e-07 A 6= 1.30338e-10 A 8=-2.17710e-13 A10=-6.40065e-16 A12=-5.65209e-20 A 3=-2.75867e-07 A 5=-1.66535e-09 A 7=-4.31108e-12 A 9= 1.98180e-14 A11= 9.48792e-18 Page 19 K = 7.21080e+00 A 4= 4.55833e-06 A 6=-5.10680e-08 A 8=-2.79624e-09 A10=-1.33211e-11 A12=-3.83738e-15 A 3=-1.52940e-06 A 5=-1.24957e-07 A 7= 1.78561e-08 A 9= 2.53114e-10 A11= 3.67957e-13 Page 29 K =-1.76940e-01 A 4=-2.43116e-06 A 6=-1.07245e-07 A 8=-2.89273e-09 A10=-1.28573e-11 A12= 1.75278e-15 A14= 1.80412e-17 A16= 3.81973e-21 A 3=-3.61691e-07 A 5= 2.85560e-07 A 7= 2.23171e-08 A 9= 2.43693e-10 A11= 3.47248e-13 A13=-4.89533e-16 A15=-3.61594e-19 Various data Zoom ratio 7.78 Wide-angle, Medium, Telephoto Focal length 15.40 45.00 119.76 F-numbers: 2.72, 2.71, 3.65 Half-angle 43.86 18.21 7.04 Image height 14.80 14.80 14.80 Lens length 353.98 353.98 353.98 BF 42.99 42.99 42.99 d18 1.15 37.59 55.59 d23 3.28 3.09 3.53 d25 40.18 4.72 2.08 d28 10.59 14.36 1.23 d33 9.78 5.24 2.56 Zoom lens group data Group starting plane focal length 1 1 46.95 2 19 -45.90 3 24 -80.55 4 26 -65.14 5 29 49.31 6 34 96.37

[0060] <Numerical Example 7> Unit: mm Surface data Surface numbers r d nd vd θgf 1* 269.913 2.80 1.80100 35.0 0.5864 2 44.227 20.13 3 637.931 2.20 1.80100 35.0 0.5864 4 198.908 12.51 5 -81.215 2.20 1.63854 55.4 0.5484 6 621.767 0.15 7 197.445 7.55 1.95906 17.5 0.6598 8 -368.126 2.21 9 159.646 15.97 1.52841 76.5 0.5396 10* -100.236 7.06 11 202.217 11.83 1.49700 81.5 0.5375 12 -153.261 2.10 1.80810 22.8 0.6307 13 -280.542 0.20 14 180.053 2.10 1.80518 25.4 0.6161 15 58.3​​​​​​​​​​​​​​​​​ 25 -60.207 0.90 1.59522 67.7 0.5442 26 27.749 8.23 ​​1.85478 24.8 0.6122 27 -48.303 1.42 28 -30.309 0.90 1.83481 42.7 0.5648 29 -135.789 (variable) 30 -26.545 0.90 1.60300 65.4 0.5401 31 76.676 2.08 1.85478 24.8 0.6122 32 -2342.425 (variable) 33* 51.486 6.13 1.90525 35.0 0.5848 34 -157.600 0.20 35 187.065 1.20 1.95375 32.3 0.5905 36 36.005 6.85 1.61800 63.3 0.5441 37 626.612 (variable) 38 (aperture) ∞ 1.80 39 84.514 1.80 1.95375 32.3 0.5905 40 52.223 5.25 1.49700 81.5 0.5375 41 -102.212 6.75 42 95.391 7.56 1.51633 64.1 0.5353 43 -41.847 2.00 1.85150 40.8 0.5695 44 119.420 27.09 45 52.730 11.35 1.43875 94.7 0.5340 46 -45.850 4.20 47 94.262 10.55 1.80810 22.8 0.6307 48 -27.214 1.10 2.00100 29.1 0.5997 49 115.798 1.00 50 86.107 8.95 1.51742 52.4 0.5564 51 -26.907 1.20 1.90525 35.0 0.5848 52 61.542 0.47 53 38.944 8.67 1.51633 64.1 0.5353 54 -58.875 44.14 Image plane ∞ Aspherical data First surface K = -4.17990e+01 A4 = 7.71336e-07 A6 = 2.11159e-09 A8 = 6.63467e-12 A10 = 8.24281e-15 A1 = -2.15272e-19 A14 = -1.79983e-21 A16 = -5.22228e-26 A3 = -8.90337e-07 A5 = -2.37087e-08 A7 = -1.30814e-10 A9 = -2.69487e-13 A11 = -1.49215e-16 A13 = 8.17630e-20 A15 = 1.63673e-23 Tenth surface K = -2.88118e+00 A = 4.26088e-07 A6 = 1.48912e-10 A8 = 2.23551e-13 A10 = -6.23258e-16 A12 = -8.34857e-20 A3 = 3.70971e-08 A5 = -1.07403e-09 A7 = -9.76116e-12 A9 = 9.01305e-15 A11 = 1.22959e-17 [[ID=二十九]] [[ID=三十]]Twenty-third surface[[ID=三十一]] [[ID=三十二]]K = -9.03038e+01 A4 = 6.40305e-06 A6 = -8.44709e-०८ A8 = -3.03087e-०९ A10 = -1.27139e - ११ A12 = -4.69417e - १५[[ID=三十三]]<0०००97०>A 3= 5.60546e-06 A 5= 1.38750e-07 A 7= 2.13193e-08 A 9= 2.52289e-10 A11= 3.68735e-13 Page 33 K =-9.57934e-02 A 4=-2.57524e-06 A 6=-1.11132e-07 A 8=-2.84291e-09 A10=-1.29901e-11 A12= 6.38985e-17 A14= 1.78744e-17 A16= 5.58693e-21 A 3=-5.73777e-07 A 5= 3.20290e-07 A 7= 2.22547e-08 A 9= 2.40487e-10 A11= 3.74561e-13 A13=-4.32081e-16 A15=-4.32450e-19 Various data Zoom ratio 7.74 Wide-angle, Medium, Telephoto Focal length 17.66 45.64 136.64 F-number 3.00 3.00 4.00 Half-angle 39.97 17.97 6.18 Image height 14.80 14.80 14.80 Lens length 366.41 366.41 366.41 BF 44.14 44.14 44.14 d22 1.50 24.60 36.01 d29 15.14 4.11 6.87 d32 24.88 21.39 0.80 d37 17.03 8:46 14.87 Zoom lens group data Group starting plane focal length 1 1 35.04 2 23 -23.02 3 30 -52.60 4 33 54.46 5 38 93.37 Table 1 shows the calculation results for each conditional expression based on the lens data of the above numerical examples 1 to 7.

[0061] [Table 1]

[0062] (Imaging device) Next, with reference to Figure 15, an imaging device using the zoom lens of each embodiment as the imaging optical system will be described. Figure 15 is a diagram of the imaging device configuration. In Figure 15, 101 is a zoom lens from one of Examples 1 to 7. 124 is a camera. The zoom lens 101 is detachable from the camera 124. 125 is an imaging device configured by attaching the zoom lens 101 to the camera 124. The zoom lens 101 has a first lens group F, a zoom section LZ, and an imaging lens group R. The first lens group F includes a lens group that moves during focusing.

[0063] The zoom section LZ includes at least two lens groups that move during zooming. On the image side of the zoom section LZ are the aperture diaphragm SP, lens group R1, and lens group R2. A removable lens unit IE is located in the optical path between lens group R1 and lens group R2. The insertion of lens unit IE between lens group R1 and lens group R2 alters the focal length range of the entire zoom lens 101 system.

[0064] 114 and 115 are drive mechanisms such as helicoids and cams that drive the first lens group F and the zoom section LZ in the optical axis direction, respectively. 116-118 are motors (driving means) that electrically drive the drive mechanisms 114 and 115 and the aperture diaphragm SP.

[0065] 119-121 are detectors such as encoders, potentiometers, or photosensors for detecting the position of the first lens group F and zoom section LZ on the optical axis, and the aperture diameter of the aperture diaphragm SP. In camera 124, 109 is a glass block corresponding to the optical filter and color separation optical system within camera 124, and 110 is an image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor that receives the subject image formed by the zoom lens 101. Furthermore, 111 and 122 are CPUs (control units) that control various drives of camera 124 and zoom lens 101. By using the zoom lenses of each embodiment in this way, an imaging device with high optical performance can be realized.

[0066] This embodiment includes the following configuration. (Composition 1) A zoom lens having a first lens group with positive refractive power that does not move for zooming and is arranged sequentially from the object side to the image side, at least three lens groups that move during zooming, and a final lens group with positive refractive power, wherein the spacing between adjacent lens groups all changes during zooming, It has an aperture diaphragm located within or adjacent to the final lens group, Let np and νp be the refractive index and Abbe number of the positive lens closest to the object among the positive lenses of the first lens group, f1 be the focal length of the first lens group, fw be the focal length of the zoom lens at the wide-angle end, ft be the focal length of the zoom lens at the telephoto end, and BF be the back focus of the zoom lens at the wide-angle end. 1.86 ≤ np ≤ 2.15 15.0 ≤ νp ≤ 22.0 2.35 ≤ ft / f1 ≤ 6.00 0.28 ≤ fw / BF ≤ 0.43 A zoom lens characterized by satisfying the following conditional equation. (Configuration 2) The first lens group comprises a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power, and a third sub-lens group with positive refractive power, arranged in order from the object side to the image side. The spacing between adjacent sub-lens groups changes for focusing purposes. The zoom lens according to configuration 1, characterized in that the first sub-lens group does not move for focusing, at least the second sub-lens group moves for focusing, and the third sub-lens group does not move for focusing. (Composition 3) The zoom lens according to configuration 2, characterized in that the first sub-lens group consists of two or three negative lenses and one positive lens arranged in order from the object side to the image side. (Composition 4) Let the average partial variance ratio and average Abbe number of the positive lenses included in the first sub-lens group be θ11p_ave and ν11p_ave, respectively, and let the average partial variance ratio and average Abbe number of the negative lenses included in the first sub-lens group be θ11n_ave and ν11n_ave, respectively. -0.0040≦(θ11p_ave-θ11n_ave) / (ν11p_ave-ν11n_ave)≦-0.0020 A zoom lens according to configuration 2 or 3, characterized by satisfying the following conditional expression. (Composition 5) -34.0≦(ν11p_ave-ν11n_ave)≦-21.0 The zoom lens according to configuration 4, characterized by satisfying the following conditional expression. (Composition 6) Let fp1 be the focal length of the positive lens closest to the object in the first lens group, and f11 be the focal length of the first sub-lens group. -3.00 ≤ fp1 / f11 ≤ -1.90 A zoom lens according to any one of configurations 2 to 5, characterized by satisfying the following conditional expression. (Composition 7) Let fn1 be the focal length of the negative lens closest to the object in the first lens group, and f11 be the focal length of the first sub-lens group. 0.80 ≤ fn1 / f11 ≤ 1.50 A zoom lens according to any one of configurations 2 to 6, characterized by satisfying the following conditional expression. (Composition 8) Let the focal length of the first sub-lens group be f11 and the focal length of the first lens group be f1. -1.70 ≤ f11 / f1 ≤ -0.70 A zoom lens according to any one of configurations 2 to 7, characterized by satisfying the following conditional expression. (Composition 9) The zoom lens according to any one of configurations 2 to 8, characterized in that the third sub-lens group consists of five or fewer lenses. (Composition 10) Let the average partial variance ratio and average Abbe number of the positive lenses included in the third sub-lens group be θ13p_ave and ν13p_ave, respectively, and let the average partial variance ratio and average Abbe number of the negative lenses included in the third sub-lens group be θ13n_ave and ν13n_ave. -0.0022≦(θ13p_ave-θ13n_ave) / (ν13p_ave-ν13n_ave)≦-0.0006 A zoom lens according to any one of configurations 2 to 9, characterized by satisfying the following conditional expression. (Composition 11) An imaging device characterized by having a zoom lens according to any of configurations 1 to 10, and an image sensor for capturing an image formed by the zoom lens.

[0067] According to each embodiment, for example, it is possible to provide a zoom lens and imaging device that are advantageous in terms of being small and lightweight, having a high zoom ratio, and having high optical performance across the entire zoom range. Although 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 its essence. [Explanation of Symbols]

[0068] L1 First lens group L2 Second lens group L3 Third lens group L4 4th lens group L5 5th lens group L6 6th lens group

Claims

1. A zoom lens having a first lens group with positive refractive power that does not move for zooming and is arranged sequentially from the object side to the image side, at least three lens groups that move during zooming, and a final lens group with positive refractive power, wherein the spacing between adjacent lens groups all changes during zooming, The first lens group consists of a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power, and a third sub-lens group with positive refractive power, arranged in order from the object side to the image side. The spacing between adjacent sub-lens groups changes for focusing, the first sub-lens group does not move for focusing, at least the second sub-lens group moves for focusing, and the third sub-lens group does not move for focusing. Of the at least three lens groups that move during the zooming process, at least two of the lens groups have a negative refractive power. The first lens group has an aperture diaphragm located within or adjacent to the final lens group, and the refractive index and Abbe number of the positive lens closest to the object among the positive lenses of the first lens group are np and νp, respectively, the focal length of the first lens group is f1, the focal length at the wide-angle end of the zoom lens is fw, the focal length at the telephoto end of the zoom lens is ft, the back focus at the wide-angle end of the zoom lens is BF, the focal length of the positive lens closest to the object in the first lens group is fp1, and the focal length of the first sub-lens group is f11. 1.86 ≤ np ≤ 2.15 15.0 ≤ νp ≤ 22.0 2.43 ≤ ft / f1 ≤ 6.00 0.28 ≤ fw / BF ≤ 0.43 -3.00 ≤ fp1 / f11 ≤ -1.90 -1.25 ≤ f11 / f1 ≤ -0.70 A zoom lens characterized by satisfying the following conditional equation.

2. A zoom lens having a first lens group with positive refractive power that does not move for zooming and is arranged sequentially from the object side to the image side, at least three lens groups that move during zooming, and a final lens group with positive refractive power, wherein the spacing between adjacent lens groups all changes during zooming, The first lens group consists of a first sub-lens group with negative refractive power, a second sub-lens group with positive refractive power, and a third sub-lens group with positive refractive power, arranged in order from the object side to the image side. The spacing between adjacent sub-lens groups changes for focusing, the first sub-lens group does not move for focusing, at least the second sub-lens group moves for focusing, and the third sub-lens group does not move for focusing. Of the at least three lens groups that move during the zooming process, at least two of the lens groups have a negative refractive power. The first lens group has an aperture diaphragm located within or adjacent to the final lens group, and the refractive index and Abbe number of the positive lens closest to the object among the positive lenses of the first lens group are np and νp, respectively, the focal length of the first lens group is f1, the focal length at the wide-angle end of the zoom lens is fw, the focal length at the telephoto end of the zoom lens is ft, the back focus at the wide-angle end of the zoom lens is BF, the focal length of the positive lens closest to the object in the first lens group is fp1, and the focal length of the first sub-lens group is f11. 1.86 ≤ np ≤ 2.15 15.0 ≤ νp ≤ 20.4 2.43 ≤ ft / f1 ≤ 6.00 0.28 ≤ fw / BF ≤ 0.43 -3.00 ≤ fp1 / f11 ≤ -1.90 A zoom lens characterized by satisfying the following conditional equation.

3. The zoom lens according to claim 1, characterized in that the first sub-lens group consists of two or three negative lenses and one positive lens arranged in order from the object side to the image side.

4. Let the average partial dispersion ratio and average Abbe number of the positive lenses included in the first sub-lens group be θ11p_ave and ν11p_ave, respectively, and let the average partial dispersion ratio and average Abbe number of the negative lenses included in the first sub-lens group be θ11n_ave and ν11n_ave, respectively. −0.0040≦(θ11p_ave−θ11n_ave) / (ν11p_ave - ν11n_ave) ≤ -0.0020 The zoom lens according to claim 1, characterized in that it satisfies the following condition.

5. -34.0≦(ν11p_ave-ν11n_ave)≦-21.0 The zoom lens according to claim 4, characterized in that it satisfies the following condition.

6. Let fn1 be the focal length of the negative lens closest to the object in the first lens group, and f11 be the focal length of the first sub-lens group. 0.80 ≤ fn1 / f11 ≤ 1.50 The zoom lens according to claim 1, characterized in that it satisfies the following condition.

7. Let the focal length of the first sub-lens group be f11 and the focal length of the first lens group be f1. -1.70 ≤ f11 / f1 ≤ -0.70 The zoom lens according to claim 2, characterized in that it satisfies the following condition.

8. The zoom lens according to claim 1, characterized in that the third sub-lens group consists of five or fewer lenses.

9. Let the average partial dispersion ratio and average Abbe number of the positive lenses included in the third sub-lens group be θ13p_ave and ν13p_ave, respectively, and let the average partial dispersion ratio and average Abbe number of the negative lenses included in the third sub-lens group be θ13n_ave and ν13n_ave, −0.0022≦(θ13p_ave−θ13n_ave) / (ν13p_ave - ν13n_ave) ≤ -0.0006 The zoom lens according to claim 1, characterized in that it satisfies the following condition.

10. An imaging device characterized by having 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