Zoom lens and imaging device having the same

Abstract

The objective is to provide a zoom lens with a lightweight focusing group and minimal fluctuations in optical performance during focusing. [Solution] The zoom lens L0 has a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, and a rear group LR including one or more lens groups. The zoom lens L0 has an aperture diaphragm SP. The rear group LR has a focus group LF with negative refractive power that moves toward the image side when focusing from infinity to near distance, and at least one lens group provided on the image side of the focus group. The first lens group L1 has three or more negative lenses. The focus group LF consists of a cemented lens or a single lens. The zoom lens L0 satisfies a predetermined conditional expression.

Description

[Technical Field]

[0001] The present invention relates to zoom lenses and the like, and is suitable for imaging devices such as digital video cameras, digital still cameras, broadcast cameras, and silver halide film cameras. [Background technology]

[0002] In wide-angle zoom lenses, there is a need to miniaturize the optical system while also reducing the weight of the focusing group to enable high-speed focusing.

[0003] Patent Document 1 discloses a zoom lens composed of a single negative lens in order to reduce the weight of the focus group. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2014-157168 [Overview of the project] [Problems that the invention aims to solve]

[0005] The zoom lens described in Patent Document 1 is configured to generate a large negative distortion in order to miniaturize the zoom lens. However, with the configuration of the focus group of the zoom lens disclosed in Patent Document 1, it is expected that astigmatism and field curvature will fluctuate significantly during focusing.

[0006] Therefore, the present invention aims to provide a zoom lens in which the focusing group is lightweight and in which the variation in optical performance during focusing is small. [Means for solving the problem]

[0007] The zoom lens of the present invention has a first lens group with negative refractive power, a second lens group with positive refractive power, and a rear group including one or more lens groups, arranged in order from the object side to the image side, wherein when zooming from the wide-angle end to the telephoto end, the first lens group moves toward the image side and the spacing between adjacent lens groups changes. The zoom lens has an aperture diaphragm, The aforementioned rear group comprises a focusing group with negative refractive power that moves toward the image side when focusing from infinity to near distance, and at least one lens group provided on the image side of the focusing group. The first lens group has three or more negative lenses, The aforementioned focus group consists of cemented lenses or single lenses. When Lfw is the distance from the aperture diaphragm at the wide-angle end to the vertex of the object-side surface of the focus group, Ls is the distance from the aperture diaphragm at the wide-angle end to the image plane, Ra is the radius of curvature of the lens surface closest to the object in the focus group, and Rb is the radius of curvature of the lens surface closest to the image in the focus group, 0.3 <Lfw / Ls<0.5 0.8 < (Rb + Ra) / (Rb - Ra) < 2.2 It is characterized by satisfying the following conditional expression. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a zoom lens in which the focusing group is lightweight and in which the variation in optical performance during focusing is small. [Brief explanation of the drawing]

[0009] [Figure 1] This is a cross-sectional view of the zoom lens of Example 1. [Figure 2] This is an aberration diagram of the zoom lens of Example 1. [Figure 3] This is a cross-sectional view of the zoom lens of Example 2. [Figure 4] This is an aberration diagram of the zoom lens in Example 2. [Figure 5] This is a cross-sectional view of the zoom lens of Example 3. [Figure 6] It is an aberration diagram of the zoom lens of Example 3. [Figure 7] It is a lens cross-sectional view of the zoom lens of Example 4. [Figure 8] It is an aberration diagram of the zoom lens of Example 4. [Figure 9] It is a lens cross-sectional view of the zoom lens of Example 5. [Figure 10] It is an aberration diagram of the zoom lens of Example 5. [Figure 11] It is a lens cross-sectional view of the zoom lens of Example 6. [Figure 12] It is an aberration diagram of the zoom lens of Example 6. [Figure 13] It is a schematic diagram showing an imaging device.

Best Mode for Carrying Out the Invention

[0010] Hereinafter, examples of the zoom lens of the present invention and an imaging device having the same will be described based on the accompanying drawings.

[0011] FIGS. 1, 3, 5, 7, 9, and 11 are cross-sectional views of the zoom lenses L0 of Examples 1 to 6, respectively. The zoom lens L0 of each example is a zoom lens used in an imaging device such as a digital video camera, a digital still camera, a broadcast camera, a silver salt film camera, a surveillance camera, or an in-vehicle camera.

[0012] In each lens cross-sectional view, the left side is the object side and the right side is the image side. Note that the zoom lens L0 of each example may be used as a projection lens such as a projector. In this case, the left side is the screen side and the right side is the projected image side.

[0013] The zoom lens L0 of each example has a first lens group L1 with a negative refractive power, a second lens group L2 with a positive refractive power, and a rear group LR including one or more lens groups, which are arranged in order from the object side to the image side. Further, the rear group LR has a focus group LF that moves during focusing, and has at least one lens group on the image side of the focus group LF.

[0014] In each cross-sectional view, Li represents the i-th lens group, counting from the object side (i is a natural number). In this specification, a lens group is a collection of lenses that move or remain stationary as a whole during zooming. That is, the distance between adjacent lens groups changes during zooming. Each lens group may consist of one lens or multiple lenses. Each lens group may also include an aperture diaphragm.

[0015] Furthermore, the arrows shown in each lens cross-sectional diagram represent the movement trajectory when zooming from the wide-angle end to the telephoto end, and the movement trajectory when focusing from infinity to close distance.

[0016] In each lens cross-sectional view, SP is the aperture diaphragm. IP is the image plane, and when the zoom lens of each embodiment is used in a digital still camera or digital video camera, the image plane of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor is placed on it. When the zoom lens of each embodiment is used as a shooting zoom lens for a silver halide film camera, a photosensitive surface corresponding to the film plane is placed on the image plane IP.

[0017] Figures 2, 4, 6, 8, 10, and 12 are aberration diagrams of zoom lenses from Examples 1 to 6, respectively. In each aberration diagram, (A) is the aberration diagram at the wide-angle end, and (B) is the aberration diagram at the telephoto end. Both (A) and (B) show the cases where the object distance is infinity and very close.

[0018] In the spherical aberration diagram, Fno is the F-number and indicates the amount of spherical aberration for the d-line (wavelength 587.6 nm) and the g-line (wavelength 435.8 nm). In the astigmatism diagram, S indicates the amount of aberration at the sagittal image plane, and M indicates the amount of aberration at the meridional image plane. In the distortion diagram, the amount of distortion for the d-line is shown. In the chromatic aberration diagram, the amount of lateral chromatic aberration at the g-line is shown. ω is the half-angle of view (°).

[0019] Next, we will describe the characteristic configurations of the zoom lenses in each embodiment.

[0020] In the zoom lenses of each embodiment, the refractive power of the first lens group L1 is made negative, which moves the entrance pupil closer to the object and reduces the diameter of the front element (the lens positioned closest to the object). Furthermore, the refractive power of the second lens group L2 is made positive, which converges the on-axial marginal rays diverged by the first lens group L1, reducing the diameter of the lens groups L2 and beyond. In addition, by positioning the focus group LF, which moves during focusing, at the position furthest from the image side of the rear group LR, it is possible to keep the off-axis rays incident on the focus group LF relatively low. This reduces the diameter of the focus group LF.

[0021] Furthermore, by incorporating three or more negative lenses in the first lens group L1, field curvature and astigmatism, which occur particularly at the wide-angle end, are effectively reduced.

[0022] Furthermore, the LF focus group is made lighter by using a cemented lens or a single lens.

[0023] Furthermore, the following condition is satisfied. Here, Lfw is the distance from the aperture diaphragm SP at the wide-angle end to the vertex of the lens surface closest to the object in the focusing group LF. Ls is the distance from the aperture diaphragm SP at the wide-angle end to the image plane IP. Ra is the radius of curvature of the lens surface closest to the object in the focusing group LF. Rb is the radius of curvature of the lens surface closest to the image in the focusing group LF.

[0024] 0.3 <Lfw / Ls<0.5 (1) 0.8 < (Rb + Ra) / (Rb - Ra) < 2.2 (2) Conditional equation (1) is a conditional equation concerning the arrangement of the focus group LF at the wide-angle end. If the upper limit is exceeded, the focus group LF becomes farther from the aperture diaphragm SP. In this case, the off-axis rays incident on the focus group LF cannot be made sufficiently low, and the diameter of the focus group LF tends to increase. Conversely, if the lower limit is exceeded, the focus group LF will be positioned at a high position of the on-axis marginal rays, which is undesirable because it tends to increase the spherical aberration fluctuations associated with focusing.

[0025] Furthermore, condition (2) is a conditional equation relating to the shape factor of the focus group LF. By making the focus group LF concentric in shape with respect to the aperture diaphragm SP, astigmatism and field curvature variations during focusing can be reduced.

[0026] The variation in the astigmatism coefficient ΔIII when an object moves is given by the following equation.

[0027] ΔIII = -δ(V+IIs) + δ 2 ' Here, δ is the parameter for object motion, V is the distortion aberration coefficient, IIs is the coma aberration coefficient of the pupil, and Is is the spherical aberration coefficient of the pupil.

[0028] Here, it can be seen that if negative distortion is greatly increased in order to miniaturize a zoom lens, the distortion coefficient V will increase, resulting in a larger fluctuation in ΔIII (the astigmatism coefficient when an object moves). In this case, if the shape of the focus group is a concave shape with a strong curvature on the image side, off-axis rays will enter the image side of the focus group at an angle, and the astigmatism fluctuation and field curvature fluctuation when the focus group moves will increase. In other words, the effects of a large negative distortion and the effects of the focus group shape occur simultaneously, and as a result, the fluctuation of astigmatism associated with focusing becomes significant.

[0029] Therefore, in order to suppress astigmatism and field curvature fluctuations during focusing, by adopting a shape for the focus group that is concentric with respect to the aperture so as to satisfy condition (2), off-axis rays are incident on the surface of the focus group at a gentle (almost perpendicular) rate, thereby suppressing fluctuations in imaging performance associated with focusing. If the upper limit is exceeded, the lens surface on the image side of the focus group LF becomes too concave with a strong curvature toward the object side, causing marginal rays of the on-axis light beam to enter at an angle, resulting in large fluctuations in spherical aberration, which is undesirable. If the lower limit is exceeded, the lens surface on the image side of the focus group LF becomes too concave with a strong curvature toward the image side, resulting in large fluctuations in astigmatism and field curvature, which is undesirable.

[0030] With the above configuration, it is possible to obtain a zoom lens L0 in which the LF focusing group is lightweight and the optical performance does not fluctuate much during focusing.

[0031] Furthermore, it is preferable that at least one of the upper or lower limits of the numerical range in either condition (1) or (2) be within the range of the following condition (1a) and (2a).

[0032] 0.32 <Lfw / Ls<0.47 (1a) 0.9 < (Rb + Ra) / (Rb - Ra) < 2.0 (2a) More preferably, at least one of the upper or lower limits of the numerical range of either conditional expression (1) or (2) is within the range of the following conditional expressions (1b) and (1b).

[0033] 0.33 <Lfw / Ls<0.45 (1b) 1.0 < (Rb + Ra) / (Rb - Ra) < 1.9 (2b) Next, we will describe the preferred configuration of the zoom lens L0 in each embodiment.

[0034] The focusing group LF may consist of cemented lenses, but it is even more preferable that it consists of a single lens. This allows for further weight reduction of the focusing group LF.

[0035] Furthermore, it is preferable that the focus group LF moves toward the object when zooming from the wide-angle end to the telephoto end. This allows the focus group LF to be positioned at a lower position for off-axis rays at the telephoto end, making it easier to further reduce the diameter of the focus group LF.

[0036] Furthermore, it is preferable to provide a lens group with positive refractive power at the image-side end of the rear group LR. This increases the focus (position) sensitivity of the focus group LF. Consequently, it becomes possible to reduce the amount of movement of the focus group LF associated with focusing from infinity to near. As a result, the diameter of the focus group LF can be reduced.

[0037] Furthermore, it is preferable to configure the zoom lens L0 as follows: a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, a focusing group LF, a fourth lens group L4 with positive refractive power, and a fifth lens group L5 with positive refractive power. This allows for the securing of an appropriate back focus through the positive refractive power of the fourth lens group L4 and the fifth lens group L5.

[0038] Alternatively, the zoom lens L0 may consist of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, a focusing group LF, a fourth lens group L4 with negative refractive power, and a fifth lens group L5 with positive refractive power. This makes it possible to cancel chromatic aberration between the fourth lens group L4 and the fifth lens group L5, resulting in higher performance.

[0039] Furthermore, by constructing the LF focus group, the L4 fourth lens group, and the L5 fifth lens group with single lenses, the L0 zoom lens can be made even lighter.

[0040] Furthermore, when the focusing group LF, the fourth lens group L4, and the positive fifth lens group L5 are each composed of a single lens, it is preferable to make the image-side lens surface of each convex. This causes off-axis rays to enter the surface gently (almost perpendicularly), which can suppress astigmatism and fluctuations in field curvature during focusing.

[0041] Furthermore, the refractive index of the negative lens within the focus group LF should be 1.75 or higher. This allows for a gentler curvature of the focus group LF, reducing its volume. Consequently, the focus group LF can be made lighter.

[0042] Next, we will describe the preferred conditional expressions that should be satisfied in the zoom lens L0 of each embodiment.

[0043] The zoom lens L0 of each embodiment preferably satisfies one or more of the following conditional expressions.

[0044] -3.5<(1-βf 2 )×βr 2 <-1.3 (3) 0.6 <skw / fw<1.4 (4) 28 < νdn < 45 (5) 0.020 <Dt / ft<0.12 (6) -20 < 100 × (y - y0) / y0 < -8 (7) -3.5 <fna / fw<-1.0 (8) 1.4 <fs / fw<3.0 (9) 0.8 <Lft / Lfw<1.4 (10) 1.2 <ft / fw<2.1 (11) Here, βf is the lateral magnification of the focusing group LF at the telephoto end. βr is the combined lateral magnification of all lens groups positioned on the image side of the focusing group LF at the telephoto end. skw is the back focus at the wide-angle end. fw is the total focal length of the zoom lens L0 at the wide-angle end. νdn is the Abbe number of the negative lenses included in the focusing group LF. Dt is the amount of movement of the focusing group LF from infinity to near focus at the telephoto end. Here, Dt is assumed to be positive when the focusing lens group LF moves from the object side to the image side. ft is the total focal length of the zoom lens L0 at the telephoto end. y is the maximum real image height at the wide-angle end. y0 is the ideal image height at the angle of view (maximum angle of view) corresponding to the maximum real image height y at the wide-angle end. fna is the focal length of the focusing group LF. fs is the combined focal length of all lenses from the aperture SP to the focusing group LF at the wide-angle end. Lft is the distance from the aperture diaphragm SP at the telephoto end to the vertex of the object-side lens surface of the focus group LF.

[0045] Condition (3) represents the focus (position) sensitivity of the focus group LF at the telephoto end. If it falls below the lower limit, the absolute value of the ratio of the angle of incidence of on-axis rays to the focus group LF and the angle of emission of the focus group LF to the lens group positioned on the image side becomes too large, causing excessive fluctuations in spherical aberration when the focus group LF moves during focusing. If it exceeds the upper limit, the focus sensitivity becomes too low, the amount of movement from infinity to near becomes large, and the focus group LF may be positioned at a high position for off-axis rays, resulting in a larger focus group LF.

[0046] Conditional equation (4) represents the ratio of the back focus at the wide-angle end to the total focal length of the system at the wide-angle end. If it falls below the lower limit, the back focus at the wide-angle end becomes too short. As a result, ghosting due to reflected light between the low-pass filter or IR cut filter located on the object side of the image plane IP and the image-side lens of the zoom lens L0 becomes more likely. If it exceeds the upper limit, the zoom lens becomes larger, which is undesirable.

[0047] Condition (5) represents the Abbe number of the negative lenses in the LF focus group. Exceeding the upper limit is undesirable because it becomes difficult for the negative lenses in the LF focus group to adequately cancel the chromatic aberration that occurs in the LR rear group when focusing at infinity. Exceeding the lower limit makes chromatic aberration more likely to occur, especially at close range. Note that if the LF focus group contains multiple negative lenses, condition (5) only needs to satisfy at least one negative lens, but preferably all negative lenses should satisfy it.

[0048] Condition (6) represents the ratio of the amount of movement of the focusing group LF from infinity to near focus at the telephoto end to the total focal length of the entire system at the telephoto end. If it falls below the lower limit, the refractive power of the focusing group LF needs to be increased in order to focus at sufficiently close distances. As a result, fluctuations in spherical aberration, field curvature, and astigmatism associated with focusing tend to become larger. If it exceeds the upper limit, the amount of movement of the focusing group LF becomes too large, and the focusing group LF may be positioned at a high position for off-axis rays at the near end, causing the focusing group LF to become larger.

[0049] Conditional equation (7) represents the distortion rate at the wide-angle end. The ideal image height y0 is calculated as f × tanθ, where f is the focal length of the entire system at the wide-angle end, and θ is the angle (half-angle of view) between the light ray incident on the object side of the entire system closest to the object and the optical axis, corresponding to the maximum real image height y. The real image height y can be determined by the maximum radius of the image circle of the zoom lens L0. If the upper limit is exceeded, it becomes necessary to loosen the refractive power within the first lens group L1 in order to reduce the absolute value of the distortion rate, which increases the distance from the lens surface closest to the object to the image plane IP, making it easier for the zoom lens L0 to become larger. If the lower limit is exceeded, the absolute value of the distortion rate becomes too large, the peripheral part of the image is greatly compressed, and it becomes difficult to obtain a sufficiently high-quality image.

[0050] Condition (8) represents the ratio of the focal length of the focusing group LF to the total focal length of the entire system at the wide-angle end. If it falls below the lower limit, the absolute value of the focal length of the focusing group LF becomes too long, resulting in a large amount of movement during focusing. As a result, the focusing group LF may be positioned at a high position for off-axis rays, and the focusing group LF becomes larger. If it exceeds the upper limit, the absolute value of the focal length of the focusing group LF becomes too short, resulting in excessive fluctuations in spherical aberration, field curvature, and astigmatism during focusing.

[0051] Conditional equation (9) represents the ratio of the combined focal length of each lens from the aperture diaphragm SP to the focusing group LF to the total focal length of the system at the wide-angle end. If it falls below the lower limit, the combined focal length of the lens group from the aperture diaphragm SP to the focusing group LF becomes too short, resulting in excessive spherical aberration. If it exceeds the upper limit, the combined focal length of the lens group from the aperture diaphragm SP to the focusing group LF becomes too long, causing the off-axis rays incident on the focusing group LF to be higher and the focusing group LF to become larger.

[0052] Conditional equation (10) represents the ratio of the distance from the aperture diaphragm SP to the vertex of the lens surface closest to the object at the telephoto end to the distance from the aperture diaphragm SP to the vertex of the lens surface closest to the object at the wide-angle end. If the value falls below the lower limit, the distance from the aperture diaphragm SP to the vertex of the object's side at the wide-angle end becomes too long, causing the off-axis rays incident on the focus group LF at the wide-angle end to be higher and larger. If the value exceeds the upper limit, the distance from the aperture diaphragm SP to the vertex of the object's side at the telephoto end becomes too long, causing the off-axis rays incident on the focus group LF at the telephoto end to be higher and larger.

[0053] Condition (11) represents the zoom ratio. If the upper limit is exceeded, the amount of movement of each lens group tends to increase, and the zoom lens L0 tends to become larger in order to secure space for movement. If the lower limit is exceeded, the zoom ratio becomes too small, making it difficult for the zoom lens to function adequately.

[0054] Furthermore, it is preferable to set at least one of the upper and lower limits of conditional expressions (3) to (11) to the following numerical range.

[0055] -3.3<(1-βf 2 )×βr 2 <-1.4 (3a) 0.7 <skw / fw<1.3 (4a) 30 < νdn < 42 (5a) 0.030 <Dt / ft<0.11 (6a) -19 < 100 × (y - y0) / y0 < -10 (7a) -3.1 <fna / fw<-1.1 (8a) 1.6 <fs / fw<2.7 (9a) 0.9 <Lft / Lfw<1.3 (10a) 1.3 <ft / fw<2.0 (11a) Furthermore, it is even more preferable to set at least one of the upper and lower limits of conditional expressions (3) to (11) to the following numerical range.

[0056] -3.2<(1-βf 2 )×βr 2 <-1.5 (3b) 0.8 <skw / fw<1.2 (4b) 34 < νdn < 40 (5b) 0.035 <Dt / ft<0.10 (6b) -18 < 100 × (y - y0) / y0 < -14 (7b) -2.8 <fna / fw<-1.2 (8b) 1.7 <fs / fw<2.4 (9b) 1.0 <Lft / Lfw<1.2 (10b) 1.4 <ft / fw<1.9 (11b) Next, we will describe the details of the configuration of the zoom lens L0 in each embodiment.

[0057] [Example 1] The zoom lens L0 of Example 1 is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive 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 with positive refractive power, arranged sequentially from the object side to the image side. By alternating the arrangement of lens groups with negative and positive refractive power, chromatic aberration and axial chromatic aberration are appropriately corrected. Furthermore, by making the fifth lens group L5 positive, a wide angle of view is achieved while ensuring back focus, and ghosting caused by unwanted light reflected between the image plane IP (or a low-pass filter or IR cut filter that may be placed on the object side) and the fifth lens group L5 can be suppressed. In addition, the third lens group L3 is moved during focusing, and the object side of the third lens group L3 has a concentric shape with a concave surface relative to the aperture diaphragm SP. This suppresses fluctuations in field curvature and astigmatism even when the third lens group L3 moves during focusing, resulting in improved performance across the entire image. Furthermore, by composing the third lens group L3 with two elements, a positive lens and a negative lens, it is possible to suppress fluctuations in lateral chromatic aberration and axial chromatic aberration even when moving along the optical axis.

[0058] Furthermore, the trajectory of the first lens group during zooming is configured to move monotonically towards the image side from the wide-angle end to the telephoto end. This increases the absolute value of the focal length of the first lens group (weakening the refractive power), thereby improving the performance of the zoom lens L0.

[0059] [Example 2] In Example 2, the third lens group L3, which is the focusing group, is composed of a single negative lens, compared to Example 1. This makes it possible to miniaturize the third lens group L3, which moves during focusing.

[0060] [Example 3] The zoom lens L0 of Example 3 is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with negative refractive power, and a fifth lens group L5 with positive refractive power, arranged in order from the object side to the image side. By making the fourth lens group L4 with negative refractive power, chromatic aberration occurring in the fifth lens group L5 with positive refractive power can be effectively corrected. In addition, by placing the positive lens closest to the object, negative distortion aberration occurring in the first lens group L1 is reduced, and by suppressing the distortion rate, the compression rate at the edges of the image is reduced and the resolution is improved.

[0061] Furthermore, by joining the fourth and fifth lenses, the intensity of unwanted light reflected between the fourth and fifth lenses is reduced, thereby suppressing ghosting.

[0062] Furthermore, by moving the fifth lens group L5 towards the object from the wide-angle end to the telephoto end, the fifth lens group L5 can be positioned at a low height of off-axis rays at the telephoto end, resulting in a smaller diameter.

[0063] [Example 4] The zoom lens L0 of Example 4 is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive refractive power, a third lens group L3 with positive refractive power, a fourth lens group L4 with negative refractive power, a fifth lens group L5 with positive refractive power, and a sixth lens group L6 with positive refractive power. By dividing the positive refractive power before and after the aperture diaphragm SP into two lens groups and moving them independently during zooming, spherical aberration and coma aberration are well corrected over a wide zoom range.

[0064] [Example 5] The zoom lens L0 of Example 5 is composed of a first lens group L1 with negative refractive power, a second lens group L2 with positive 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 with negative refractive power, arranged in order from the object side to the image side. By making the fourth lens group L4 positive and the fifth lens group L5 negative, the front principal point position of the combined fourth lens group L4 and fifth lens group L5 can be moved towards the object side, shortening the back focus and thus allowing the zoom lens L0 to be miniaturized.

[0065] [Example 6] The zoom lens L0 of Example 5 is composed of a first lens group L1 with negative 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 positive refractive power, which are arranged in order from the object side to the image side. By providing one positive and one negative lens in the fourth lens group L4, the longitudinal chromatic aberration is well corrected over a wide zoom range.

[0066] The zoom lens L0 of each of the above-described examples may be used in an imaging device having an image processing function for correcting aberrations (distortion aberration and longitudinal chromatic aberration).

[0067] The numerical examples 1 to 6 corresponding to Examples 1 to 6 are shown below.

[0068] In the surface data of each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the on-axis distance (distance on the optical axis) between the m-th surface and the (m + 1)-th surface. Here, m is the surface number counted from the light incident side. Also, nd represents the refractive index with respect to the d-line of each optical member, and νd represents the Abbe number of the optical member. The Abbe number νd of a certain material is calculated as follows when the refractive indices at the d-line (587.6 nm), F-line (486.1 nm), C-line (656.3 nm), and g-line (wavelength 435.8 nm) of Fraunhofer lines are Nd, NF, NC, and Ng, respectively: νd = (Nd - 1) / (NF - NC) is represented by.

[0069] Also, when the optical surface is an aspherical surface, an asterisk (*) is attached to the right side of the surface number. The aspherical shape is expressed as follows when X is the displacement amount from the vertex of the surface in the optical axis direction, h is the height from the optical axis in the direction perpendicular to the optical axis, R is the paraxial radius of curvature, k is the conic constant, and A4, A6, A8, A10, A12,... are the aspherical coefficients of each order: x = (h 2 / R) / [1 + {1 - (1 + k)(h / R) 2} 1 / 2 + A4 × h 4 + A6 × h 6 + A8 × h 8+A10×h 10 This is expressed as follows. Note that "e±XX" in each aspherical coefficient is "×10± XX It means "...".

[0070] [Numerical Example 1] Unit: mm Surface data Face number rd nd νd Effective diameter 1 45.932 1.80 2.00100 29.1 36.70 2 19.277 7.27 29.17 3 81.393 1.40 1.84943 42.6 27.28 4 20.862 6.78 24.31 5 -32.534 1.30 1.49700 81.5 24.21 6 39.245 0.34 25.06 7 36.818 6.92 1.78582 36.7 25.39 8 -45.455 (variable) 25.35 9 46.667 1.80 1.60738 56.8 11.23 10 ∞ 3.00 10.63 11 (aperture) ∞ 3.00 10.34 12 88.981 1.00 1.80400 46.5 10.34 13 19.604 2.53 1.71300 53.9 10.25 14 -123.595 2.00 10.21 15 16.661 2.78 1.51633 64.1 10.41 16 47.619 4.87 10.69 17 34.510 1.00 1.90043 37.4 12.26 18 11.580 5.34 1.49700 81.5 12.24 19 -36.852 (variable) 13.26 20 -26.584 3.17 1.77250 49.6 14.02 21 -13.000 1.10 1.85107 36.9 14.79 22 -225.385 (variable) 16.29 23* -50.000 3.00 1.53110 55.9 21.52 24* -34.796 (variable) 23.70 25 -157.498 4.50 1.79008 48.6 36.60 26 -45.000 13.50 37.47 Image plane ∞ Aspherical data Page 23 K = 0.00000e+000 A 4=-7.50939e-005 A 6= 6.59902e-007 A 8=-4.44635e-009 A10= 1.37303e-011 Page 24 K = 0.00000e+000 A 4=-3.09530e-005 A 6= 4.44991e-007 A 8=-1.75524e-009 A10= 4.51720e-012 Various data Zoom ratio 1.89 Wide-angle, Medium, Telephoto Focal length 15.45 20.34 29.15 F-numbers: 4.60, 5.25, 6.32 Half-angle (°): 49.36, 44.61, 36.19 Image height 18.00 20.06 21.33 Lens length: 115.26 x 109.84 x 107.01 BF 13.50 13.50 13.50 d 8 25.18 13.47 1.21 d19 2.67 3.30 5.13 d22 7.82 7.19 5.36 d24 1.20 7.49 16.92 Entrance pupil position 17.00 15.69 13.74 Exit pupil position -64.71 -86.93 -130.67 Front principal point position 29.40 31.91 37.00 Back principal point position -1.95 -6.84 -15.65 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 -25.31 25.82 -0.46 -26.81 2 9 24.31 27.31 9.72 -14.84 3 20 -31.88 4.27 0.06 -2.33 4 23 201.66 3.00 6.03 4.20 5 25 78.36 4.50 3.46 0.99 Single lens data Lens starting plane, focal length 1 1 -34.34 2 3 -33.38 3 5 -35.58 4 7 26.88 5 9 76.83 6 12 -31.48 7 13 23.91 8 15 48.16 9 17 -19.76 10 18 18.40 11 20 29.90 12 21 -16.25 13 23 201.66 14 25 78.36

[0071] [Numerical Example 2] Unit: mm Surface data Face number rd nd νd Effective diameter 1 39.485 1.80 2.00100 29.1 35.98 2 19.277 6.35 29.06 3 81.393 1.40 1.90043 37.4 27.89 4 21.695 6.53 24.75 5 -37.674 1.30 1.49700 81.5 24.58 6 45.445 1.55 24.80 7 48.066 6.33 1.80610 33.3 25.36 8 -58.121 (variable) 25.19 9 75.709 2.91 1.63930 44.9 12.62 10 -99.071 5.00 11.75 11 (aperture) ∞ 3.00 10.25 12 90.807 1.00 1.80400 46.5 10.20 13 21.203 2.41 1.71300 53.9 10.11 14 -125.965 2.00 10.05 15 14.434 3.39 1.48749 70.2 10.46 16 47.619 3.38 10.70 17 40.616 1.00 1.90043 37.4 11.54 18 10.473 5.52 1.49700 81.5 11.52 19 -36.785 (variable) 12.72 20 -24.105 1.10 1.80100 35.0 14.79 21 -332.736 (variable) 15.94 22* -50.000 3.00 1.53110 55.9 21.21 23* -33.834 (variable) 23.27 24 -186.603 4.91 1.80400 46.5 37.46 25 -45.000 13.50 38.41 Image plane ∞ Aspherical data Page 22 K = 0.00000e+000 A 4=-3.17244e-005 A 6= 2.39294e-007 A 8=-2.65521e-009 A10= 1.39956e-011 Page 23 K = 0.00000e+000 A 4= 7.78280e-006 A 6= 1.77889e-007 A 8=-9.23774e-010 A10= 4.78158e-012 Various data Zoom ratio 1.89 Wide-angle, Medium, Telephoto Focal length 15.45 20.53 29.15 F-number 4.60 5.27 6.36 Half-angle (°): 49.88, 45.31, 36.58 Image height 18.34 20.75 21.63 Lens length: 115.28 mm, 109.06 mm, 106.60 mm BF 13.50 13.50 13.50 d 8 24.84 12.64 1.20 d19 2.86 4.14 6.51 d21 9.00 7.72 5.35 d23 1.20 7.19 16.16 Entrance pupil position 17.59 16.29 14.57 Exit pupil position -64.63 -84.63 -125.12 Front principal point position 29.98 32.52 37.59 Back principal point position -1.95 -7.03 -15.65 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 -24.39 25.25 0.53 -24.54 2 9 24.70 29.61 10.23 -15.77 3 20 -32.50 1.10 -0.05 -0.66 4 22 185.12 3.00 5.69 3.85 5 24 72.63 4.91 3.53 0.85 Single lens data Lens starting plane, focal length 1 1 -39.38 2 3 -33.22 3 5 -41.23 4 7 33.53 5 9 67.57 6 12 -34.63 7 13 25.63 8 15 41.11 9 17 -15.92 10 18 17.06 11 20 -32.50 12 22 185.12 13 24 72.63

[0072] [Numerical Example 3] Unit: mm Surface data Face number rd nd νd Effective diameter 1 52.248 2.62 1.51633 64.1 28.75 2 140.000 0.15 26.67 3 26.292 0.80 1.90043 37.4 20.18 4 10.697 3.20 15.85 5 60.521 0.80 1.95375 32.3 15.54 6 10.056 3.71 13.19 7 -25.717 0.80 1.49700 81.5 13.14 8 14.607 4.06 1.90366 31.3 13.41 9 -55.225 (variable) 13.10 10 -101.139 2.20 1.48749 70.2 7.88 11 -21.879 2.89 8.23 12 (aperture) ∞ 1.75 8.52 13 13.538 5.13 1.48749 70.2 8.74 14 -10.601 1.00 1.77250 49.6 8.16 15 -22.350 3.58 8.16 16 20.040 0.70 1.90043 37.4 9.69 17 8.853 4.71 1.49700 81.5 9.63 18 -21.100 (variable) 10.46 19 -19.295 0.70 1.91082 35.3 10.75 20 -100.891 (variable) 11.26 21* -24.999 1.50 1.53110 55.9 14.14 22* -26.775 (variable) 15.39 23 -182.094 4.42 1.60311 60.6 18.76 24 -22.000 (Variable) 20.18 Image plane ∞ Aspherical data Page 21 K = 0.00000e+000 A 4=-1.91538e-004 A 6= 5.07567e-006 A 8=-8.17417e-008 A10= 5.32571e-010 Page 22 K = 0.00000e+000 A 4=-6.30674e-005 A 6= 4.22634e-006 A 8=-5.18522e-008 A10= 2.90202e-010 Various data Zoom ratio 1.47 Wide-angle, Medium, Telephoto Focal length 9.97 12.66 14.64 F-number 3.50 3.94 4.23 Half-angle (°): 49.63, 44.83, 41.54 Image height 11.72 12.58 12.97 Lens length: 72.73, 71.60, 71.78 BF 10.06 12.25 14.31 d 9 10.09 4.76 1.89 d18 1.44 2.18 2.76 d20 5.42 4.68 4.11 d22 0.99 3.00 4.00 d24 10.06 12.25 14.31 Entrance pupil position 11.15 10.50 10.06 Exit pupil position -51.09 -59.37 -63.10 Front principal point position 19.49 20.92 21.93 Back principal point position 0.09 -0.40 -0.33 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 -12.21 16.14 2.87 -11.14 2 10 15.46 21.97 9.98 -10.48 3 19 -26.30 0.70 -0.09 -0.45 4 21 -1004.27 1.50 -19.52 -20.90 5 23 41.06 4.42 3.10 0.37 Single lens data Lens starting plane, focal length 1 1 159.82 2 3 -20.53 3 5 -12.74 4 7 -18.62 5 8 13.15 6 10 56.75 7 13 13.11 8 14 -27.11 9 16 -18.15 10 17 13.24 11 19 -26.30 12 21 -1004.27 13 23 41.06

[0073] [Numerical Example 4] Unit: mm Surface data Face number rd nd νd Effective diameter 1 40.925 1.80 2.05090 26.9 33.27 2 21.334 4.87 27.89 3 79.995 1.40 1.95375 32.3 26.78 4 24.034 4.47 23.95 5 -91.221 1.30 1.49700 81.5 23.68 6 31.289 2.00 22.62 7 59.784 3.91 1.82097 22.5 22.63 8 -85.008 (variable) 22.27 9 100.000 1.00 1.63980 34.5 9.42 10 20.000 2.47 1.88645 38.8 9.51 11 -90.366 3.00 9.49 12 (aperture) ∞ (variable) 9.12 13 15.735 3.66 1.52647 69.8 11.78 14 -17.484 0.59 11.90 15 -16.171 1.00 1.90043 37.4 11.76 16 44.055 5.10 1.49700 81.5 12.35 17 -13.352 (variable) 13.43 18 -14.286 1.10 1.87587 39.9 13.46 19 -74.875 (variable) 14.64 20 5903.921 2.85 1.49700 81.5 19.07 21* -33.757 (variable) 20.14 22 -98.558 3.58 1.80400 46.5 26.77 23 -45.000 (variable) 28.10 Image plane ∞ Aspherical data Page 21 K = 0.00000e+000 A 4= 6.79219e-005 A 6= 1.06797e-007 A 8= 1.34694e-009 A10=-5.68552e-012 Various data Zoom ratio 1.82 Wide-angle, Medium, Telephoto Focal length 16.00 20.22 29.17 F-numbers: 4.60, 4.97, 5.66 Half-angle (°): 48.58, 45.05, 36.57 Image height 18.14 20.26 21.64 Lens length: 99.94, 95.51, 91.54 BF 13.04 19.20 30.42 d 8 22.55 12.93 1.20 d12 4.71 4.81 4.91 d17 2.26 2.44 3.69 d19 5.43 4.78 3.15 d21 7.84 7.24 4.07 d23 13.04 19.20 30.42 Entrance pupil position 17.09 15.78 13.40 Exit pupil position -53.81 -50.02 -38.59 Front principal point position 29.26 30.09 30.24 Back principal point position -2.96 -1.02 1.25 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 -22.38 19.75 2.35 -15.16 2 9 35.44 6.47 0.93 -4.01 3 13 27.72 10.35 4.14 -3.77 4 18 -20.33 1.10 -0.14 -0.73 5 20 67.55 2.85 1.89 -0.01 6 22 100.02 3.58 3.55 1.62 Single lens data Lens starting plane, focal length 1 1 -44.50 2 3 -36.47 3 5 -46.71 4 7 43.28 5 9 -39.27 6 10 18.67 7 13 16.35 8 15 -13.03 9 16 21.24 10 18 -20.33 11 20 67.55 12 22 100.02

[0074] [Numerical Example 5] Unit: mm Surface data Face number rd nd νd Effective diameter 1 50.254 1.80 2.05090 26.9 36.85 2 19.398 6.82 29.33 3 135.195 1.40 1.95375 32.3 28.56 4 30.089 5.41 26.58 5 -47.967 1.30 1.49700 81.5 26.52 6 37.077 0.19 27.13 7 35.891 7.61 1.82283 30.8 27.32 8 -62.958 (variable) 27.08 9 100.000 1.00 1.53458 47.9 10.67 10 20.000 2.47 1.84733 42.8 10.74 11 -7293.532 3.20 10.64 12 (aperture) ∞ 6.70 10.31 13 20.310 3.45 1.56657 68.8 11.12 14 -23.439 0.77 11.40 15 -17.148 1.00 1.90043 37.4 11.36 16 58.384 4.41 1.49700 81.5 12.04 17 -15.093 (variable) 13.17 18 -22.042 1.10 1.85000 35.0 14.06 19 -73.968 (variable) 14.82 20* 123.352 4.61 1.51380 54.6 21.29 21* -32.035 (variable) 22.35 22 -43.536 1.50 1.88449 39.0 23.28 23 -87.118 (variable) 24.42 Image plane ∞ Aspherical data Page 20 K = 0.00000e+000 A 4= 7.78121e-006 A 6=-1.41841e-007 A 8= 1.32693e-009 A10=-7.58503e-012 Page 21 K = 0.00000e+000 A 4= 4.93770e-005 A 6=-4.36212e-008 A 8= 1.50692e-009 A10=-6.87281e-012 Various data Zoom ratio 1.88 Wide-angle, Medium, Telephoto Focal length 15.53 20.47 29.15 F-numbers: 4.60, 5.01, 5.59 Half-angle (°): 49.20, 43.44, 35.66 Image height 18.00 19.38 20.92 Lens length: 120.00 x 109.11 x 99.49 BF 15.70 23.59 24.20 d 8 32.68 17.17 1.20 d17 4.32 4.50 5.63 d19 10.14 6.17 3.93 d21 2.40 2.92 9.77 d23 15.70 23.59 24.20 Entrance pupil position 17.77 16.10 13.44 Exit pupil position -40.00 -33.43 -33.85 Front principal point position 28.97 29.22 27.95 Back principal point position 0.16 3.13 -4.95 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 -26.49 24.53 -0.82 -23.99 2 9 25.34 23.00 10.82 -11.53 3 18 -37.30 1.10 -0.25 -0.86 4 20 50.00 4.61 2.44 -0.63 5 22 -100.01 1.50 -0.81 -1.62 Single lens data Lens starting plane, focal length 1 1 -30.99 2 3 -40.84 3 5 -41.86 4 7 28.78 5 9 -46.97 6 10 23.54 7 13 19.77 8 15 -14.63 9 16 24.62 10 18 -37.30 11 20 50.00 12 22 -100.01

[0075] [Numerical Example 6] Unit: mm Surface data Face number rd nd νd Effective diameter 1 46.382 1.80 2.05090 26.9 36.85 2 19.375 6.91 29.33 3 148.313 1.40 1.95375 32.3 28.56 4 28.489 5.81 26.58 5 -43.395 1.30 1.49700 81.5 26.52 6 35.729 0.20 27.13 7 35.165 8.11 1.79522 32.0 27.32 8 -51.640 (variable) 27.08 9 100.000 1.00 1.51753 52.4 10.67 10 20.000 2.47 1.82588 45.0 10.74 11 -7234.968 3.06 10.64 12 (aperture) ∞ 7.94 10.31 13 20.503 3.02 1.56724 64.1 11.12 14 -21.985 0.74 11.40 15 -16.908 1.00 1.90043 37.4 11.36 16 58.603 4.42 1.49700 81.5 12.04 17 -15.011 (variable) 13.17 18 -23.876 1.10 1.85000 35.0 14.06 19 -82.849 (variable) 14.82 20* 112.899 3.87 1.49967 65.6 21.29 21* -32.833 2.02 22.35 22 -40.113 1.50 1.75377 52.3 23.28 23 -87.118 (variable) 24.42 Image plane ∞ Aspherical data Page 20 K = 0.00000e+000 A 4= 8.69555e-006 A 6=-1.43147e-007 A 8= 1.23812e-009 A10=-8.16964e-012 Page 21 K = 0.00000e+000 A 4= 4.80363e-005 A 6=-4.52567e-008 A 8= 1.32395e-009 A10=-7.40260e-012 Various data Zoom ratio 1.87 Wide-angle, Medium, Telephoto Focal length 15.60 19.00 29.15 F-numbers: 4.54, 4.86, 5.73 Half-angle (°): 49.09, 44.98, 35.72 Image height 18.00 18.99 20.96 Lens length: 120.00 x 112.82 x 104.38 BF 18.33 24.39 34.47 d 8 30.79 19.62 1.20 d17 2.82 2.53 3.93 d19 10.38 8.60 7.10 d23 18.33 24.39 34.47 Entrance pupil position 17.79 16.60 13.71 Exit pupil position -40.00 -36.67 -35.07 Front principal point position 29.21 29.69 30.64 Back principal point position 2.73 5.39 5.32 Zoom lens group data Group starting plane Focal length Lens length Front principal point position Rear principal point position 1 1 -27.61 25.54 -1.42 -26.70 2 9 25.57 23.66 12.00 -11.67 3 18 -39.80 1.10 -0.24 -0.84 4 20 101.68 7.39 0.11 -5.31 Single lens data Lens starting plane, focal length 1 1 -32.78 2 3 -37.19 3 5 -39.21 4 7 27.44 5 9 -48.51 6 10 24.15 7 13 19.20 8 15 -14.48 9 16 24.53 10 18 -39.80 11 20 51.36 12 22 -100.00 The following table shows various values ​​for each example.

[0076] [Table 1]

[0077] [Imaging device] Next, an embodiment of a digital still camera (imaging device) using the zoom lens of the present invention will be described with reference to Figure 13. In Figure 13, 10 is the camera body, and 11 is a lens device including any of the zoom lenses L0 described in Examples 1 to 6.

[0078] 12 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor, which is built into the camera body and receives the optical image formed by the lens device 11 and converts it into photoelectric energy. The camera body 10 may be a so-called single-lens reflex camera with a quick-turn mirror, or a so-called mirrorless camera without a quick-turn mirror.

[0079] Thus, by applying the zoom lens L0 of the present invention to an imaging device such as a digital still camera, it becomes possible to achieve rapid focusing and obtain high-quality images with minimal variation in image quality at each focus position.

[0080] Although preferred embodiments and examples of the present invention have been described above, the present invention is not limited to these embodiments and examples, and various combinations, modifications, and changes are possible within the scope of its gist. [Explanation of symbols]

[0081] L0 Zoom Lens L1 First lens group L2 Second lens group LF focus group LR rear group SP aperture diaphragm

Claims

1. A zoom lens having a first lens group with negative refractive power, a second lens group with positive refractive power, and a rear group including one or more lens groups, arranged in order from the object side to the image side, wherein the first lens group moves toward the image side and the spacing between adjacent lens groups changes when zooming from the wide-angle end to the telephoto end, The zoom lens has an aperture diaphragm, The aforementioned rear group comprises a focusing group with negative refractive power that moves toward the image side when focusing from infinity to near distance, and at least one lens group provided on the image side of the focusing group. The first lens group has three or more negative lenses, The aforementioned focus group consists of cemented lenses or single lenses. When Lfw is the distance from the aperture diaphragm at the wide-angle end to the vertex of the object-side surface of the focus group, Ls is the distance from the aperture diaphragm at the wide-angle end to the image plane, Ra is the radius of curvature of the lens surface closest to the object in the focus group, and Rb is the radius of curvature of the lens surface closest to the image in the focus group, 0.3<Lfw / Ls<0.5 0.8<(Rb+Ra) / (Rb-Ra)<2.2 A zoom lens characterized by satisfying the following conditional equation.

2. The zoom lens according to claim 1, characterized in that the focus group is composed of a single lens.

3. When the lateral magnification of the focus group at the telephoto end is βf, and the combined lateral magnification of all lens groups positioned on the image side of the focus group at the telephoto end is βr, -3.5<(1-β&) ２ )×βr ２ <-1.3 A zoom lens according to claim 1 or 2, characterized in that it satisfies the following conditional expression.

4. When the back focus at the wide-angle end is skw and the focal length of the zoom lens at the wide-angle end is fw, 0.6<skw / fw<1.4 A zoom lens according to any one of claims 1 to 3, characterized in that it satisfies the following conditional expression.

5. When the Abbe number of the negative lens included in the aforementioned focus group is νdn, 28 < νdn < 45 A zoom lens according to any one of claims 1 to 4, characterized in that it satisfies the following conditional expression.

6. When Dt is the amount of movement of the focus group from infinity to near focus at the telephoto end, and ft is the focal length of the zoom lens at the telephoto end, 0.020<Dt / ft<0.12 A zoom lens according to any one of claims 1 to 5, characterized in that it satisfies the following conditional expression.

7. When y is the maximum real image height at the wide-angle end, and y0 is the ideal image height of the maximum angle of view of the zoom lens at the wide-angle end, -20<100×(y-y0) / y0<-8 A zoom lens according to any one of claims 1 to 6, characterized in that it satisfies the following conditional expression.

8. When the focal length of the focus group is fna and the focal length of the zoom lens at the wide-angle end is fw, -3.5<fna / fw<-1.0 A zoom lens according to any one of claims 1 to 7, characterized in that it satisfies the following conditional expression.

9. When the combined focal length of all lenses from the aperture diaphragm to the LF focus group at the wide-angle end is fs, and the focal length of the zoom lens at the wide-angle end is fw, 1.4<fs / fw<3.0 A zoom lens according to any one of claims 1 to 8, characterized in that it satisfies the following conditional expression.

10. When Lft is the distance from the aperture diaphragm at the telephoto end to the vertex of the lens surface on the object side of the focus group, 0.8<Lft / Lfw<1.4 A zoom lens according to any one of claims 1 to 9, characterized in that it satisfies the following conditional expression.

11. When the focal length of the zoom lens at the telephoto end is ft and the focal length of the zoom lens at the wide-angle end is fw, 1.2<ft / fw<2.1 A zoom lens according to any one of claims 1 to 10, characterized in that it satisfies the following conditional expression.

12. The zoom lens according to any one of claims 1 to 11, characterized in that the focus group moves toward the object when zooming from the wide-angle end to the telephoto end.

13. The zoom lens according to any one of claims 1 to 12, characterized in that a group of lenses with positive refractive power is arranged on the image side of the rear group.

14. The zoom lens according to any one of claims 1 to 13, characterized in that the refractive index of the negative lens included in the focus group is 1.75 or greater.

15. An imaging device characterized by having a zoom lens according to any one of claims 1 to 14 and an image sensor that receives an image formed by the zoom lens.

Images