Zoom lens and imaging device

Abstract

To provide a compact and lightweight zoom lens with a wide angle of view, a high zoom ratio, and high optical performance.SOLUTION: A zoom lens comprises, from the object side to the image side, a first lens group LV which has positive refractive power and is stationary for zooming, an intermediate group M which includes three or more lens groups, each of which moves for zooming, and a rear lens group LR which has positive refractive power and is stationary for zooming. The intermediate group comprises: a first negative lens group LV which includes a single lens group or two or more partial lens groups that move monotonically toward the image side during zooming from the wide angle end to the telephoto end, and has negative refractive power as a whole; a positive lens group LP which is continuously arranged from the side nearest to the image to the object side in the intermediate group, moves during the zooming, and has positive refractive power; and a second negative lens group LN which moves during the zooming and has negative refractive power. A condition: 1.00≤f1 / fR≤2.00, -5.00≤βPw≤-1.00 is satisfied.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a zoom lens used in an imaging device. [Background technology]

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

[0003] A known zoom lens with a wide angle of view and a high zoom ratio is a positive-lead zoom lens, which has, in order from the object side to the image side, a first lens group with positive refractive power and a second lens group with negative refractive power that moves for zooming. Patent Documents 1 and 2 disclose zoom lenses that have, in order from the object side to the image side, a first lens group with positive refractive power that does not move for zooming, multiple movable lens groups that move for zooming, and a rear lens group with positive refractive power that does not move for zooming. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2014-215586 [Patent Document 2] Japanese Patent Application Publication No. 2019-39945 Summary of the Invention [Problem to be solved by the invention]

[0005] Patent Documents 1 and 2 disclose zoom lenses with a half angle of view of about 35° at the wide-angle end and a zoom ratio of about 20. However, in order to further widen the angle of view and increase the zoom ratio of a zoom lens, the first lens group would need to be made larger and the amount of movement of the second lens group would need to be increased, which could be detrimental to optical performance and size reduction. The present invention provides a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Means for solving the problem]

[0006] A zoom lens according to one aspect of the present invention has, arranged in order from the object side to the image side, a first lens group having positive refractive power that does not move for zooming, an intermediate group including three or more lens groups that each move for zooming, and a rear lens group having positive refractive power that does not move for zooming. The spacing between adjacent lens groups changes during zooming. The intermediate group may be a single lens group or two or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end. Nore The first lens group has a negative refractive power as a whole. middle The zoom lens has a first lens group, a second lens group with a positive refractive power, and a third lens group with a negative refractive power, which are arranged successively in the intermediate group from the image side to the object side, and which move during zooming. When the focal length of the first lens group is f1, the focal length of the rear lens group is fR, and the lateral magnification of the positive lens group at the wide-angle end is βPw, 1.00≦f1 / fR≦2.00 -4.50 ≦βPw≦-1.00 The present invention is characterized in that the following conditions are satisfied: Note that an imaging device that captures an image through the zoom lens constitutes another aspect of the present invention. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a cross-sectional view of a zoom lens according to a first embodiment. [Figure 2] 4A to 4C are aberration diagrams of the zoom lens of Example 1. [Figure 3] FIG. 10 is a cross-sectional view of a zoom lens according to a second embodiment. [Figure 4] 10A to 10C are aberration diagrams of the zoom lens of Example 2. [Figure 5] FIG. 10 is a cross-sectional view of a zoom lens according to a third embodiment. [Figure 6] 10A to 10C are aberration diagrams of the zoom lens of Example 3. [Figure 7] FIG. 10 is a cross-sectional view of a zoom lens according to a fourth embodiment. [Figure 8] 10A to 10C are aberration diagrams of the zoom lens of Example 4. [Figure 9] FIG. 10 is a cross-sectional view of a zoom lens according to a fifth embodiment. [Figure 10] 10A to 10C are aberration diagrams of the zoom lens of Example 5. [Figure 11] FIG. 10 is a cross-sectional view of a zoom lens according to a sixth embodiment. [Figure 12] 13A to 13C are aberration diagrams of the zoom lens of Example 6. [Figure 13] FIG. 1 is a diagram showing the configuration of an imaging apparatus. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Prior to describing specific embodiments 1 to 6, matters common to each embodiment will be described with reference to Fig. 1, which shows the zoom lens of embodiment 1. Fig. 1 shows the configuration of the zoom lens of embodiment 1 at the wide-angle end and focused at infinity.

[0010] In a zoom lens, a lens group is a group of one or more lenses that move together during zooming (variable magnification) between the wide-angle end and the telephoto end. That is, the spacing between adjacent lens groups changes during zooming. The lens group may include an aperture stop. The wide-angle end and the telephoto end refer to the zoom states with the maximum and minimum angles of view (shortest focal lengths) when the lens group that moves during zooming is located at the ends of its mechanically or controllably movable range on the optical axis.

[0011] The zoom lens of each embodiment has, arranged in order from the object side to the image side, a first lens group L1, an intermediate group M including three or more lens groups, an aperture stop SP, and a rear lens group (relay lens group) LR.

[0012] The first lens unit L1 is stationary (does not move) for zooming, and has positive refractive power.

[0013] The intermediate group M includes a first negative lens group LV having negative refractive power, and a positive lens group LP having positive refractive power and a second negative lens group LN having negative refractive power, which are arranged in the intermediate group M in order from the image side to the object side. The first negative lens group LV moves monotonically toward the image side during zooming from the wide-angle end to the telephoto end. The second negative lens group LN moves non-monotonically, tracing a convex locus toward the object side during zooming. The positive lens group LP moves non-monotonically, tracing a convex locus toward the object side during zooming from the wide-angle end to the telephoto end, tracing a convex locus toward the object side, and then moves non-monotonically, tracing a convex locus toward the image side during zooming from the wide-angle end to the telephoto end. The intermediate group M may include other lens groups. The first negative lens group LV may be configured as a single lens group or may be configured as two or more partial lens groups (see Example 2).

[0014] The aperture stop SP does not move during zooming. The rear lens unit LR does not move during zooming and has positive refractive power.

[0015] I is the image plane. The image plane I is where the image pickup surface (light receiving surface) of the image sensor and the film surface (photosensitive surface) of the silver halide film are located.

[0016] A glass block P containing a prism, an optical filter, etc. is disposed between the zoom lens and the image plane I. However, the glass block P does not necessarily have to be provided.

[0017] Furthermore, in order to focus (adjust the focus) from a long-distance object to a close-distance object, the first lens group L1 moves in whole or in part.

[0018] In the zoom lens of each embodiment (each numerical example described later), the focal length of the first lens unit L1 is f1, the focal length of the rear lens unit LR is fR, and the lateral magnification at the wide-angle end of the positive lens unit LP included in the middle unit M is βPw. In this case, the zoom lens has the following: 1.00≦f1 / fR≦2.00 (1) -5.00≦βPw≦-1.00 (2) The following conditions are satisfied.

[0019] The second negative lens unit LN and the positive lens unit LP move toward the object side during zooming from the wide-angle end to the zoom position Za. At this time, the first negative lens unit LV is positioned closer to the object side at the same zoom position Za, so that the entrance pupil position of the zoom lens can be positioned closer to the object side. This prevents the first lens unit L1 from becoming excessively large. Note that the zoom position Za is the position where the zoom magnification from the wide-angle end to the telephoto end is Z, and the zoom magnification is Z. 0.25 This is the position where

[0020] The condition of formula (1) represents the condition for obtaining a zoom lens advantageous in terms of a wide angle of view, a high zoom ratio, small size and light weight, and high optical performance. If f1 / fR exceeds the upper limit of formula (1), the focal length of the first lens unit L1 becomes too long, and the lateral magnification of the first negative lens unit LV at the wide-angle end becomes too small. As a result, the movement amount of the first negative lens unit LV becomes large when zooming from the wide-angle end to the telephoto end, and the entrance pupil of the zoom lens is located excessively toward the image side at the wide-angle end. This increases the diameter of the first lens unit L1, which is undesirable, and the zoom lens becomes large. If f1 / fR falls below the lower limit of formula (1), the focal length of the first lens unit L1 becomes too short, and the magnification of the first lens unit L1 at the telephoto end becomes large. As a result, various aberrations at the telephoto end increase, which is undesirable.

[0021] Equation (2) also indicates the conditions for obtaining a zoom lens that is advantageous in terms of wide angle of view, high zoom ratio, small size and light weight, and high optical performance. If βPw exceeds the upper limit of equation (2), the movement amount of the positive lens unit LP becomes too large for image point correction at the telephoto end. As a result, the space required for the positive lens unit LP to move during zooming becomes large, which is undesirable. If βPw falls below the lower limit of equation (2), the change in magnification accompanying the movement of the positive lens unit LP during zooming from the wide-angle end to zoom position Za becomes too small. As a result, the entrance pupil of the zoom lens is located too far toward the image side at the wide-angle end, which increases the diameter of the first lens unit L1 and therefore increases the size of the zoom lens, which is undesirable.

[0022] It is also preferable that the zoom lens of each embodiment satisfies at least one of the conditions of the following expressions (3) to (14).

[0023] In the zoom lens of each embodiment, when the lateral magnification of the positive lens unit LP included in the intermediate unit M at the wide-angle end is βPw and the lateral magnification of the positive lens unit LP at the telephoto end is βPt, 1.01≦βPt / βPw≦1.20 (3) It is preferable to satisfy the following conditions.

[0024] The condition of formula (3) also indicates the condition for obtaining a zoom lens that is advantageous in terms of wide angle of view, high zoom ratio, small size and light weight, and high optical performance. If βPt / βPw exceeds the upper limit of formula (3), the movement amount of the positive lens unit LP becomes too large when zooming from the wide-angle end to the telephoto end, resulting in an undesirable increase in the size of the zoom lens. If βPt / βPw falls below the lower limit of formula (3), the zoom ratio of the first negative lens unit LV becomes too large when zooming from the wide-angle end to the telephoto end, resulting in an undesirable increase in the movement amount of the first negative lens unit LV, or the lateral magnification of the first negative lens unit LV becomes too large, resulting in an undesirable increase in the diameter of the first lens unit L1 required at the wide-angle end. As a result, the zoom lens becomes undesirable, resulting in an undesirable increase in size.

[0025] In the zoom lenses of the present embodiments, when the focal length of the rear lens unit LR is fR and the focal length of the positive lens unit LP included in the intermediate unit M is fP, 0.30≦fP / fR≦1.00 (4) It is preferable to satisfy the following condition. The condition of formula (4) also indicates a condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, small size and light weight, and high optical performance. If fP / fR exceeds the upper limit of formula (4), the refractive power of the positive lens unit LP becomes too weak, which results in an increase in the size of the zoom lens, which is undesirable. If fP / fR falls below the lower limit of formula (4), the refractive power of the positive lens unit LP becomes too strong, which results in large fluctuations in various aberrations during zooming, which is undesirable.

[0026] In the zoom lens of each embodiment, when the focal length of the rear lens unit LR is fR and the focal length of the second negative lens unit LN included in the intermediate unit M is fN, -3.00≦fN / fR≦-0.50 (5) It is preferable to satisfy the following condition. The condition of formula (5) also indicates a condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. If fN / fR exceeds the upper limit of formula (5), the refractive power of the second negative lens unit LN becomes too weak, which undesirably increases the size of the zoom lens. If fN / fR falls below the lower limit of formula (5), the refractive power of the second negative lens unit LN becomes too strong, which undesirably increases the fluctuations of various aberrations during zooming.

[0027] In the zoom lens of each embodiment, when the focal length of the positive lens unit LP included in the intermediate unit M is fP and the focal length of the second negative lens unit LN is fN, -1.00≦fP / fN≦-0.20 (6) It is preferable to satisfy the following condition: The condition of formula (6) defines the relationship between the focal lengths of the positive lens unit LP and the second negative lens unit LN. By satisfying the condition of formula (6), it is possible to obtain the effect that the movement amounts of the positive lens unit LP and the second negative lens unit LN during zooming are not too large, and that the fluctuations in various aberrations are not too large.

[0028] In the zoom lens of each embodiment, when the focal length at the wide-angle end of the first negative lens unit LV included in the intermediate unit M is fV and the focal length of the positive lens unit LP is fP, -4.00≦fP / fV≦-1.50 (7) It is preferable to satisfy the following condition: ∇ ...

[0029] In the zoom lens of each embodiment, when the focal length at the wide-angle end of the first negative lens unit LV included in the intermediate unit M is fV and the focal length of the second negative lens unit LN is fN, 2.00≦fN / fV≦10.00 (8) It is preferable to satisfy the following condition: The condition of formula (8) defines the relationship between the focal lengths of the first negative lens unit LV and the second negative lens unit LN. By satisfying the condition of formula (8), it is possible to obtain the effect that the movement amounts of the first negative lens unit LV and the second negative lens unit LN during zooming are not too large, or that fluctuations in various aberrations are not too large.

[0030] In the zoom lens of each embodiment, when the lateral magnification at the wide-angle end of the second negative lens unit LN included in the intermediate unit M is βNw, 0.20≦βNw≦0.80 (9) It is preferable to satisfy the following condition. The condition in equation (9) also indicates a condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. If βNw exceeds the upper limit of equation (9), the movement amount of the second negative lens unit LN becomes too large during image point correction at the telephoto end, the space required for the second negative lens unit LN to move during zooming becomes large, and the zoom lens becomes large, which is undesirable. If βNw falls below the lower limit of equation (9), the change in magnification accompanying the movement of the first negative lens unit LN during zooming from the wide-angle end to zoom position Za becomes too small, and the entrance pupil of the zoom lens is located excessively close to the image side at the wide-angle end. As a result, the diameter of the first lens unit L1 increases, and the zoom lens becomes large, which is undesirable.

[0031] In the zoom lens of each embodiment, when the lateral magnification at the wide-angle end of the first negative lens unit LV included in the intermediate unit M is βVw, -0.35≦βVw≦-0.15 (10) It is preferable to satisfy the following condition. The condition in equation (10) also indicates a condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, small size and light weight, and high optical performance. If βVw exceeds the upper limit of equation (10), the movement amount of the first negative lens unit LV during zooming becomes too large, the space required for the first negative lens unit LV to move becomes large, and the zoom lens becomes large, which is undesirable. If βVw falls below the lower limit of equation (10), the change in the image point position of the first negative lens unit LV on the telephoto side becomes too large, and the movement amount of the second negative lens unit LN and the positive lens unit LP becomes too large. As a result, the zoom lens becomes large and the fluctuations in various aberrations during zooming become too large, which is undesirable.

[0032] In the zoom lens of each embodiment, when the average value of the refractive index at the d-line of one or more positive lenses included in the positive lens unit LP of the middle unit M is NdPp, 1.60≦NdPp≦1.90 (11) It is preferable to satisfy the following condition. Equation (11) also indicates the condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, small size and light weight, and high optical performance. If NdPp is below the lower limit of equation (11), the fluctuations in various aberrations during zooming become too large, which is undesirable. If NdPp is above the upper limit of equation (11), the dispersion of the material becomes large, which causes the fluctuations in chromatic aberrations during zooming to become too large, which is undesirable.

[0033] In the zoom lens of each embodiment, when the average value of the Abbe numbers of one or more negative lenses included in the positive lens unit LP of the middle unit M with reference to the d-line is VdPn, 16.0≦νdPn≦30.0 (12) It is preferable to satisfy the following conditions.

[0034] The Abbe number vd based on the d-line is defined as vd=(Nd-1) / (NF-NC), where NF, Nd, and NC are the refractive indices at the F-line (wavelength 486.1 nm), d-line (wavelength 587.6 nm), and C-line (wavelength 656.3 nm), respectively.

[0035] Equation (12) also indicates the conditions for obtaining a zoom lens that is advantageous in terms of wide angle of view, high zoom ratio, small size and light weight, and high optical performance. If vdPn exceeds the upper limit of equation (12), the fluctuation of chromatic aberration during zooming becomes too large, which is undesirable. Furthermore, if the curvature of the negative lens in the positive lens unit LP becomes too small, the volume of the negative lens increases, and the positive lens unit LP becomes large. This results in an undesirable increase in the size of the mechanism that moves the positive lens unit LP during zooming. If vdPn falls below the lower limit of equation (12), it becomes difficult to obtain an optical material for the negative lens that transmits light in the visible range, which is also undesirable.

[0036] In the zoom lens of each embodiment, the lateral magnification of the positive lens group LP included in the middle group M at the wide-angle end is βPw, and the lateral magnification of the second negative lens group LN at the wide-angle end is βNw. Also, the lateral magnification of the positive lens group LP at the zoom position Za is βPz, and the lateral magnification of the second negative lens group LN at the zoom position Za is βNz. In this case, the zoom lens of each embodiment has 1.20≦βPz / βPw×βNz / βNw≦1.60 (13) It is preferable to satisfy the following condition. Equation (13) also indicates the condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, a small size and light weight, and high optical performance. If the value of equation (13) exceeds the upper limit of the equation, the second negative lens unit LN and the positive lens unit LP at the zoom position Za will be positioned too far toward the object, and various aberrations at the zoom position Za will become too large, which is undesirable. If the value of equation (13) is below the lower limit of the equation, the entrance pupil of the zoom lens will be positioned too far toward the image, and the first lens unit L1 will become large, which is undesirable.

[0037] In the zoom lens of each embodiment, when the focal length of the positive lens G1 located closest to the object among the positive lens group LP included in the intermediate group M is fPG1 and the focal length of the positive lens group LP is fP, 0.90≦fPG1 / fP≦1.80 (14) It is preferable to satisfy the following condition. Equation (14) also indicates the condition for obtaining a zoom lens that is advantageous in terms of a wide angle of view, a high zoom ratio, small size and light weight, and high optical performance. If fPG1 / fP does not satisfy the condition of equation (14), the fluctuations in various aberrations during zooming will be too large, which is not preferable.

[0038] It is more preferable that the numerical ranges of the formulas (1) to (14) are as follows:

[0039] 1.10≦f1 / fR≦1.90 (1a) -4.50≦βPw≦-1.80 (2a) 1.03≦βPt / βPw≦1.15 (3a) 0.50≦fP / fR≦0.90 (4a) -2.00≦fN / fR≦-1.00 (5a) -0.80≦fP / fN≦-0.30 (6a) -3.00≦fP / fV≦-2.00 (7a) 3.00≦fN / fV≦8.00 (8a) 0.30≦βNw≦0.55 (9a) -0.30≦βNw≦-0.20 (10a) 1.65≦NdPp≦1.85 (11a) 16.0≦νdPn≦27.0 (12a) 1.30≦βPz / βPw×βNz / βNw≦1.50 (13a) 1.10≦fPG1 / fP≦1.60 (14a) Furthermore, it is more preferable to set the numerical ranges of the formulas (1) to (14) as follows:

[0040] 1.15≦f1 / fR≦1.85 (1b) -4.20≦βPw≦-2.00 (2b) 1.035≦βPt / βPw≦1.135 (3b) 0.55≦fP / fR≦0.85 (4b) -1.70≦fN / fR≦-1.00 (5b) -0.75≦fP / fN≦-0.40 (6b) -3.00≦fP / fV≦-2.20 (7b) 3.10≦fN / fV≦6.5 (8b) 0.33≦βNw≦0.50 (9b) -0.28≦βNw≦-0.20 (10b) 1.67≦NdPp≦1.82 (11b) 17.0≦νdPn≦25.0 (12b) 1.33≦βPz / βPw×βNz / βNw≦1.46 (13b) 1.10≦fPG1 / fP≦1.50 (14b) The zoom lenses of Examples 1 to 6 will be specifically described below. After Example 6, Numerical Examples 1 to 6 corresponding to Examples 1 to 6 will be shown. In each Numerical Example, the surface number i indicates the order of the optical surface counted from the object side. [Example]

[0041] In the zoom lens of Example 1 (Numerical Example 1) shown in FIG. 1 , the first lens unit L1 has surfaces 1 to 12 and is composed of one negative lens and five positive lenses. The middle lens unit LM has surfaces 13 to 28. The first negative lens unit LV, having surfaces 13 to 20, is composed of one negative lens whose object-side surface is aspherical, two negative lenses, and two positive lenses. The second negative lens unit LN, having surfaces 21 to 23, is composed of one negative lens and one positive lens. The positive lens unit LP, having surfaces 24 to 28, is composed of one positive lens whose image-side surface is aspherical, one negative lens, and one positive lens. The aperture stop SP is surface 29. The rear lens unit LR has surfaces 30 to 42 and is composed of three negative lenses and five positive lenses.

[0042] In Numerical Example 1, r is the radius of curvature of the ith surface (mm), d is the lens thickness or air gap (mm) between the ith surface and the (i+1)th surface, and nd6 and Nd indicate the absolute refractive index at 1 atmosphere on the d-line of the Fraunhofer line. νd is the Abbe number based on the d-line of the optical material between the ith surface and the (i+1)th surface, and is defined as described above. The half angle of view ω (°) is expressed as follows, where 2Y is the diagonal size of the image sensor of the imaging device in which the zoom lens is used, and fw is the focal length of the zoom lens at the wide-angle end: ω=arctan(Y / fw) It is expressed by the following formula. The maximum image height (mm) is equivalent to half Y (e.g., 5.50 mm) of the diagonal size 2Y (e.g., 11.00 mm). BF is the back focus (mm), which is the distance on the optical axis from the final surface of the zoom lens (the lens surface closest to the image) to the paraxial image plane, expressed as an air-equivalent length. The total lens length (mm) is the distance on the optical axis from the frontmost surface of the zoom lens (the lens surface closest to the object) to the final surface, plus the back focus.

[0043] An "*" next to a surface number indicates that the surface has an aspherical shape. The aspherical shape is expressed by the following formula, where X is the displacement from the vertex of the surface in the optical axis direction, H is the height from the optical axis in a direction perpendicular to the optical axis, the direction of light travel is positive, R is the paraxial radius of curvature, K is the conic constant, and A3 to A16 are aspherical coefficients. Note that "e±Z" is "×10 ±Z The explanation of the above numerical example also applies to other numerical examples described later.

[0044]

number

[0045] Figure 2 shows longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens of Numerical Example 1 at infinity focus at (a) the wide-angle end, (b) zoom position Za, (c) the intermediate zoom position, and (d) the telephoto end. The spherical aberration diagrams show spherical aberration at the d-line (wavelength 587.6 nm), g-line (wavelength 435.8 nm), C-line (wavelength 656.3 nm), and F-line (wavelength 486.1 nm) using solid, two-dot chain, one-dot chain, and dashed lines, respectively. The astigmatism diagrams show astigmatism at the meridional and sagittal image planes using dashed and solid lines, respectively. The distortion diagrams show distortion at the e-line. The chromatic aberration diagrams show lateral chromatic aberration at the e-line, g-line, C-line, and F-line using solid, two-dot chain, one-dot chain, and dashed lines, respectively. Fno represents the F-number, and ω represents the half angle of view (°). The full scale of the horizontal axis of the spherical aberration diagram is ±0.400 mm, and the full scale of the horizontal axis of the astigmatism diagram is also ±0.400 mm. The full scale of the horizontal axis of the distortion diagram is ±10.000%. The full scale of the horizontal axis of the chromatic aberration diagram is ±0.100 mm. The above explanation of the aberration diagrams also applies to other numerical examples described later.

[0046] The values ​​of formulas (1) to (14) in Numerical Example 1 are summarized in Table 1. The values ​​of the variables included in formulas (1) to (14) in Numerical Example 1 are summarized in Table 2. The zoom lens of Numerical Example 1 satisfies all of the conditions of formulas (1) to (14), and is a small, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Example]

[0047] FIG. 3 shows the configuration of a zoom lens of Example 2 (Numerical Example 2) at the wide-angle end and focusing at infinity. In this example, the first lens unit L1 has surfaces 1 to 12 and is composed of one negative lens and five positive lenses. The intermediate unit LM has surfaces 13 to 30. The first negative lens unit LV is composed of, from the object side, a first partial lens unit LV1 and a second partial lens unit LV2. The first partial lens unit LV1 and the second partial lens unit LV2 move monotonically toward the image side while the spacing between them changes slightly (smaller than the change in spacing between the other lens units) during zooming from the wide-angle end to the far-angle end. The first partial lens unit LV1, which has surfaces 13 and 14, is composed of a negative lens whose object-side surface is aspherical. The second partial lens unit LV2, which has surfaces 15 to 20, is composed of two negative lenses and two positive lenses. The second negative lens group LN has surfaces No. 21 to No. 25 and is composed of two negative lenses and one positive lens. The positive lens group LP has surfaces No. 26 to No. 30 and is composed of one positive lens whose object-side surface is aspherical, one negative lens, and one positive lens. The aperture stop SP is surface No. 31. The rear lens group LR has surfaces No. 32 to No. 44 and is composed of three negative lenses and five positive lenses. Note that the first negative lens group LV may be composed of three or more partial lens groups.

[0048] FIG. 4 shows longitudinal aberrations of the zoom lens of Numerical Example 2 when focused at infinity at (a) the wide-angle end, (b) zoom position Za, (c) the intermediate zoom position, and (d) the telephoto end. The values ​​of equations (1) to (14) in Numerical Example 2 are summarized in Table 1. The values ​​of the variables included in equations (1) to (14) in Numerical Example 2 are summarized in Table 2. The zoom lens of Numerical Example 2 satisfies all of the conditions of equations (1) to (14), and is a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Example]

[0049] FIG. 5 shows the configuration of a zoom lens of Example 3 (Numerical Example 3) at the wide-angle end and focusing at infinity. In this example, the first lens unit L1 has surfaces 1 to 11 and is composed of one negative lens with an aspherical image-side surface, one positive lens with an aspherical image-side surface, one positive lens with an aspherical object-side surface, and two positive lenses. The intermediate lens unit LM has surfaces 12 to 27. The first negative lens unit LV, having surfaces 12 to 19, is composed of one negative lens with an aspherical object-side surface, two negative lenses, and two positive lenses. The second negative lens unit LN, having surfaces 20 to 22, is composed of one negative lens and one positive lens. The positive lens unit LP, having surfaces 23 to 27, is composed of one positive lens with an aspherical object-side surface, one negative lens, and one positive lens. The aperture stop SP is surface 28. The rear lens unit LR has surfaces Nos. 29 to 41, and is composed of three negative lenses and five positive lenses.

[0050] FIG. 6 shows longitudinal aberrations of the zoom lens of Numerical Example 3 when focused at infinity at (a) the wide-angle end, (b) zoom position Za, (c) the intermediate zoom position, and (d) the telephoto end. The values ​​of equations (1) to (14) in Numerical Example 3 are summarized in Table 1. The values ​​of the variables included in equations (1) to (14) in Numerical Example 3 are summarized in Table 2. The zoom lens of Numerical Example 3 satisfies all of the conditions of equations (1) to (14), and is a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Example]

[0051] FIG. 7 shows the configuration of a zoom lens of Example 4 (Numerical Example 4) at the wide-angle end and focusing at infinity. In this example, the first lens unit L1 has surfaces 1 to 12 and is composed of one negative lens and five positive lenses. The middle lens unit LM has surfaces 13 to 28. The first negative lens unit LV, having surfaces 13 to 20, is composed of one negative lens with an aspherical surface facing the object, two negative lenses, and two positive lenses. The second negative lens unit LN, having surfaces 21 to 23, is composed of one negative lens and one positive lens. The positive lens unit LP, having surfaces 24 to 28, is composed of one positive lens with an aspherical surface facing the image, one negative lens, and one positive lens. The aperture stop SP is surface 29. The rear lens unit LR has surfaces 30 to 42 and is composed of three negative lenses and five positive lenses.

[0052] FIG. 8 shows longitudinal aberrations of the zoom lens of Numerical Example 4 when focused at infinity at (a) the wide-angle end, (b) zoom position Za, (c) the intermediate zoom position, and (d) the telephoto end. The values ​​of equations (1) to (14) in Numerical Example 4 are summarized in Table 1. The values ​​of the variables included in equations (1) to (14) in Numerical Example 4 are summarized in Table 2. The zoom lens of Numerical Example 4 satisfies all of the conditions of equations (1) to (14), and is a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Example]

[0053] FIG. 9 shows the configuration of a zoom lens of Example 5 (Numerical Example 5) at the wide-angle end and focusing at infinity. In this example, the first lens unit L1 has surfaces 1 to 12 and is composed of one negative lens and five positive lenses. The middle lens unit LM has surfaces 13 to 28. The first negative lens unit LV, having surfaces 13 to 20, is composed of one negative lens with an aspherical surface facing the object, two negative lenses, and two positive lenses. The second negative lens unit LN, having surfaces 21 to 23, is composed of one negative lens and one positive lens. The positive lens unit LP, having surfaces 24 to 28, is composed of one positive lens with an aspherical surface facing the image, one negative lens, and one positive lens. The aperture stop SP is surface 29. The rear lens unit LR has surfaces 30 to 42 and is composed of three negative lenses and five positive lenses.

[0054] FIG. 9 shows longitudinal aberrations of the zoom lens of Numerical Example 5 when focused at infinity at (a) the wide-angle end, (b) zoom position Za, (c) the intermediate zoom position, and (d) the telephoto end. Table 1 summarizes the values ​​of formulas (1) to (14) in Numerical Example 5. Table 2 summarizes the values ​​of the variables included in formulas (1) to (14) in Numerical Example 5. The zoom lens of Numerical Example 5 satisfies all of the conditions of formulas (1) to (14), and is a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance. [Example]

[0055] FIG. 11 shows the configuration of a zoom lens of Example 6 (Numerical Example 6) at the wide-angle end and focusing at infinity. In this example, the first lens unit L1 has surfaces 1 to 11 and is composed of one negative lens with an aspherical image-side surface, one positive lens with an aspherical image-side surface, one positive lens with an aspherical object-side surface, and two positive lenses. The intermediate lens unit LM has surfaces 12 to 27. The first negative lens unit LV, having surfaces 12 to 19, is composed of one negative lens with an aspherical object-side surface, two negative lenses, and two positive lenses. The second negative lens unit LN, having surfaces 20 to 22, is composed of one negative lens and one positive lens. The positive lens unit LP, having surfaces 23 to 27, is composed of one positive lens with an aspherical object-side surface, one negative lens, and one positive lens. The aperture stop SP is surface 28. The rear lens unit LR has surfaces Nos. 29 to 41, and is composed of three negative lenses and five positive lenses.

[0056] FIG. 12 shows longitudinal aberrations of the zoom lens of Numerical Example 6 when focused at infinity at (a) the wide-angle end, (b) zoom position Za, (c) the intermediate zoom position, and (d) the telephoto end. Table 1 summarizes the values ​​of formulas (1) to (14) in Numerical Example 5. Table 2 summarizes the values ​​of the variables included in formulas (1) to (14) in Numerical Example 6. The zoom lens of Numerical Example 6 satisfies all of the conditions of formulas (1) to (14), and is a compact, lightweight zoom lens that has a wide angle of view, a high zoom ratio, and high optical performance.

[0057] In the zoom lenses of Examples 1 to 6, the rear lens group LR does not move during zooming. However, the entire rear lens group or a portion thereof (a partial lens group) may be moved, and the above-described effects can still be achieved in this case. For example, in Example 1, the portion of the rear lens group LR from surface 33 to surface 42 may be moved. Because a substantially afocal light beam is incident on surface 33 from the object side, even if this portion moves, the optical characteristics other than the back focus remain substantially unchanged. By moving this portion, it is possible to correct focus changes that occur due to changes in the state of the zoom lens, such as zooming, focusing, aperture diaphragm operation, temperature, air pressure, attitude, and insertion / removal of the variable magnification optical system. [Numerical example 1] Unit: mm Surface Data Surface number rd nd νd 1 -149.059 1.50 1.76634 35.8 2 133.529 5.10 3 181.054 11.74 1.43387 95.1 4 -127.668 0.20 5 257.936 7.03 1.43387 95.1 6 -257.936 7.09 7 165.831 5.74 1.43387 95.1 8 1350.737 0.15 9 126.151 11.11 1.43387 95.1 10 -221.313 0.49 11 63.698 5.87 1.76385 48.5 12 108.416 (variable) 13* 107.013 0.85 2.05090 26.9 14 12.679 5.36 15 -30.111 0.60 1.88300 40.8 16 -401.121 6.78 1.89286 20.4 17 -10.830 0.65 2.00100 29.1 18 -126.500 0.18 19 53.124 2.75 1.78472 25.7 20 -139.718 (variable) 21 -36.661 0.90 1.95375 32.3 22 125.708 3.28 1.92286 18.9 23 -79.329 (variable) 24 270.503 6.86 1.77250 49.6 25* -47.332 0.15 26 43.458 1.10 1.89286 20.4 27 25.980 7.23 1.64000 60.1 28 201.186 (variable) 29 (Aperture) ∞ 2.48 30 -131.227 3.40 1.84666 23.8 31 -38.975 0.90 1.81600 46.6 32 519.453 35.00 33 45.791 4.93 1.75520 27.5 34 -176.937 2.78 35 367.396 0.90 2.00100 29.1 36 22.124 6.97 1.49700 81.5 37 -88.326 0.20 38 357.352 4.77 1.48749 70.2 39 -28.360 0.90 1.88300 40.8 40 -204.507 0.15 41 43.617 6.23 1.48749 70.2 42 -42.787 4.00 43 ∞ 33.00 1.60859 46.4 44 ∞ 13.20 1.51633 64.1 45∞6.99 Image plane ∞ Aspheric data Page 13 K = 1.99983e+00 A 4= 1.77649e-05 A 6=-5.29341e-08 A 8= 3.29999e-10 A10= 1.02584e-11 A12=-2.22171e-13 A14= 1.50679e-15 A16=-3.44562e-18 Page 25 K =-1.91921e-01 A 4= 8.11367e-07 A 6= 7.19921e-09 A 8=-1.46342e-10 A10= 1.41032e-12 A12=-6.88616e-15 A14= 1.65877e-17 A16=-1.56715e-20 Various data Zoom ratio 25.91 Focal length 7.58 17.10 38.57 196.35 F-number 1.80 1.80 1.80 2.95 Half angle of view (°) 35.97 17.83 8.12 1.60 Image height 5.50 5.50 5.50 5.50 Lens total length 293.25 293.25 293.25 293.25 BF 6.99 6.99 6.99 6.99 d12 0.70 23.04 42.85 58.25 d20 68.05 28.02 8.39 3.40 d23 1.81 9.94 15.76 1.10 d28 3.17 12.73 6.73 10.98 Lens group data Group starting plane focal length 1 1 72.15 2 13 -12.90 3 21 -71.58 4 24 36.72 5 29 52.73 [Numerical example 2] Unit: mm Surface Data Surface number rd nd νd 1 -138.229 1.50 1.76626 35.9 2 170.362 2.98 3 335.907 9.39 1.43387 95.1 4 -127.445 0.20 5 316.936 6.62 1.43387 95.1 6 -191.782 7.10 7 122.126 6.36 1.43387 95.1 8 -65297.705 0.23 9 106.103 8.66 1.43387 95.1 10 -326.850 0.26 11 61.310 4.93 1.76385 48.5 12 95.635 (variable) 13* 56.294 0.40 2.05090 26.9 14 12.644 (variable) 15 -24.661 0.40 2.00100 29.1 16 39.759 8.25 1.89286 20.4 17 -10.396 0.40 2.00100 29.1 18 -77.835 0.18 19 72.144 2.58 1.76182 26.5 20 -123.904 (variable) 21 -163.929 0.50 1.88300 40.8 22 45.749 4.07 1.84666 23.8 23 -153.469 2.83 24 -34.563 0.50 1.88300 40.8 25 -83.861 (variable) 26* 208.843 6.11 1.72916 54.7 27 -40.948 0.20 28 86.741 6.44 1.64000 60.1 29 -57.640 1.00 1.95906 17.5 30 -146.754 (variable) 31 (Aperture) ∞ 0.17 32 44.845 2.92 1.84666 23.8 33 105.280 0.70 1.95375 32.3 34 33.820 40.00 35 66.885 4.76 1.80518 25.4 36 -90.679 1.39 37 3681.607 0.70 1.88300 40.8 38 29.299 6.61 1.48749 70.2 39 -81.054 0.35 40 56.549 7.52 1.43875 94.7 41 -28.113 0.70 2.00100 29.1 42 -373.602 1.40 43 -617.396 4.66 1.49700 81.5 44 -30.324 4.00 45 ∞ 33.00 1.60859 46.4 46 ∞ 13.20 1.51633 64.1 47∞7.41 Image plane ∞ Aspheric data Page 13 K = 1.43462e+00 A 4= 1.25880e-05 A 6= 3.38554e-08 A 8=-2.62158e-09 A10= 6.34686e-11 A12=-7.72337e-13 A14= 4.62697e-15 A16=-1.08135e-17 Page 26 K =-1.23985e+00 A 4=-2.88234e-06 A 6= 2.02274e-09 A 8=-4.55937e-12 A10= 1.02261e-14 A12=-8.86234e-18 Various data Zoom ratio 27.94 Focal length 7.50 17.25 39.65 209.59 F-number 1.80 1.80 1.80 3.40 Half angle of view (°) 36.25 17.69 7.90 1.50 Image height 5.50 5.50 5.50 5.50 Lens total length 290.00 290.00 290.00 290.00 BF 7.41 7.41 7.41 7.41 d12 0.69 22.78 40.68 56.01 d14 7.24 6.16 6.03 6.87 d20 67.17 29.71 8.82 5.69 d25 0.38 6.76 11.83 0.31 d30 2.91 12.98 11.04 9.52 Lens group data Group starting plane focal length 1 1 70.97 2 13 -15.59 3 15 -50.78 4 21 -63.38 5 26 34.33 6 31 57.68 [Numerical example 3] Unit: mm Surface Data Surface number rd nd νd 1 1161.973 3.00 1.83481 42.7 2* 55.708 10.48 3 202.598 2.30 1.85478 24.8 4 91.753 10.37 1.43875 94.7 5 -179.322 3.82 6 96.636 10.91 1.43387 95.1 7 -127.744 3.64 8 84.532 7.63 1.43875 94.7 9* 271.789 1.35 10* 86.189 6.25 1.76385 48.5 11 -526.736 (variable) 12* 452.536 0.80 1.95375 32.3 13 14.288 6.02 14 -34.746 0.80 1.88300 40.8 15 -342.558 6.64 1.89286 20.4 16 -12.125 0.60 1.95375 32.3 17 1468.209 0.18 18 48.950 3.77 1.62000 62.2 19 -53.156 (variable) 20 -29.258 0.75 1.71300 53.8 21 68.257 2.70 1.80810 22.8 22 -266.726 (variable) 23* 80.582 5.40 1.72916 54.7 24 -54.890 0.21 25 -250.931 1.10 1.85478 24.8 26 40.024 7.04 1.78336 49.5 27 -67.274 (variable) 28 (Aperture) ∞ 2.89 29 265.955 7.18 1.72151 29.2 30 -36.469 0.90 1.74100 52.6 31 93.872 35.00 32 57.552 6.29 1.74840 27.7 33 -153.418 3.49 34 -1256.618 1.00 1.88300 40.8 35 20.318 9.12 1.49700 81.5 36 -54.978 0.35 37 62.438 4.73 1.43875 94.7 38 -32.455 1.00 2.00100 29.1 39 532.156 0.21 40 44.870 5.59 1.50137 56.4 41 -32.096 4.00 42 ∞ 33.00 1.60859 46.4 43 ∞ 13.20 1.51633 64.1 44∞5.99 Image plane ∞ Aspheric data 2nd side K = 0.00000e+00 A 4=-3.88538e-07 A 6= 1.38805e-10 A 8= 2.55862e-14 A10= 9.31507e-18 9th page K = 0.00000e+00 A 4=-1.35128e-06 A 6=-4.70579e-10 A 8=-3.54412e-12 A10= 7.10965e-15 A12=-6.18795e-18 A14= 2.73136e-21 A16=-4.92221e-25 Side 10 K = 0.00000e+00 A 4=-8.86143e-07 A 6=-3.48567e-10 A 8=-2.07946e-12 A10= 3.61558e-15 A12=-2.85289e-18 A14= 1.12335e-21 A16=-1.80823e-25 Side 12 K =-1.04680e-01 A 4= 1.21567e-05 A 6=-4.36047e-08 A 8= 1.08229e-09 A10=-1.32183e-11 A12= 6.48790e-14 A14=-6.88863e-17 A16=-2.29401e-19 Page 23 K =-9.62925e-01 A 4=-4.37878e-06 A 6= 3.49608e-09 A 8=-9.13154e-12 A10=2.27920e-14 A12=-1.74182e-17 Various data Zoom ratio 20.77 Focal length 6.50 13.88 29.62 135.00 F-number 1.80 1.80 1.80 3.10 Half angle of view (°) 40.24 21.62 10.52 2.33 Image height 5.50 5.50 5.50 5.50 Lens total length 295.00 295.00 295.00 295.00 BF 5.99 5.99 5.99 5.99 d11 0.68 21.49 39.29 56.10 d19 58.37 23.93 5.95 3.00 d22 6.14 10.58 13.25 0.07 d27 0.10 9.29 6.80 6.12 Zoom lens group data Group starting plane focal length 1 1 57.64 2 12 -15.86 3 20 -50.52 4 23 36.62 5 28 49.58 [Numerical example 4] Unit: mm Surface Data Surface number rd nd νd 1 -256.838 1.50 1.76634 35.8 2 222.862 2.38 3 334.659 8.58 1.43387 95.1 4 -186.280 0.20 5 343.327 6.45 1.43387 95.1 6 -343.327 11.05 7 175.189 6.53 1.43387 95.1 8 2162.879 0.15 9 137.912 9.89 1.43387 95.1 10 -467.176 0.50 11 66.528 7.65 1.59522 67.7 12 129.470 (variable) 13* 163.386 0.85 2.05090 26.9 14 16.856 4.90 15 -27.664 0.60 1.88300 40.8 16 95.438 6.19 1.89286 20.4 17 -13.318 0.65 2.00100 29.1 18 -200.925 0.18 19 80.066 2.84 1.76182 26.5 20 -81.580 (variable) 21 -52.823 0.90 1.95375 32.3 22 129.643 2.81 1.92286 18.9 23 -129.028 (variable) 24 77.398 5.91 1.90525 35.0 25* -104.234 0.15 26 65.263 1.10 1.89286 20.4 27 29.834 7.72 1.59522 67.7 28 -228.980 (variable) 29 (Aperture) ∞ 2.85 30 -92.495 2.51 1.80518 25.4 31 -45.005 0.90 1.77250 49.6 32 10197.579 35.00 33 118.263 3.98 1.84666 23.8 34 -101.816 4.21 35 1283.311 0.90 2.00100 29.1 36 28.789 4.23 1.49700 81.5 37 455.217 0.20 38 65.251 6.02 1.48749 70.2 39 -29.453 0.90 1.88300 40.8 40 -85.362 0.08 41 56.395 4.69 1.48749 70.2 42 -53.551 4.00 43 ∞ 33.00 1.60859 46.4 44 ∞ 13.20 1.51633 64.1 45∞9.59 Image plane ∞ Aspheric data Page 13 K = 2.00022e+00 A 4= 3.63392e-06 A 6= 1.32125e-08 A 8=-6.95629e-10 A10= 1.57692e-11 A12=-1.79024e-13 A14= 9.45740e-16 A16=-1.86493e-18 Page 25 K = 1.46007e+00 A 4= 1.61906e-06 A 6=-2.91965e-10 A 8=-1.35714e-12 A10= 3.16592e-14 A12=-1.98539e-16 A14= 5.38317e-19 A16=-5.45265e-22 Various data Zoom ratio 25.93 Focal length 9.61 21.68 48.92 249.13 F-number 1.80 1.80 1.80 3.10 Half angle of view (°) 29.79 14.24 6.41 1.26 Image height 5.50 5.50 5.50 5.50 Lens total length 295.91 295.91 295.91 295.91 BF 9.59 9.59 9.59 9.59 d12 1.00 27.61 48.74 64.19 d20 74.52 32.07 8.89 2.55 d23 2.57 12.69 20.59 0.77 d28 1.89 7.61 1.76 12.47 Lens group data Group starting plane focal length 1 1 88.49 2 13 -14.64 3 21 -91.80 4 24 38.51 5 29 55.50 [Numerical example 5] Unit: mm Surface Data Surface number rd nd νd 1 -181.984 1.50 1.89190 37.1 2 155.032 5.48 3 250.252 12.17 1.43387 95.1 4 -125.457 0.20 5 216.137 8.61 1.43387 95.1 6 -216.137 8.75 7 171.028 4.09 1.43387 95.1 8 392.073 0.15 9 140.137 10.93 1.43387 95.1 10 -201.671 0.50 11 69.300 5.24 1.76385 48.5 12 112.969 (variable) 13* 86.122 0.85 2.05090 26.9 14 14.236 5.60 15 -31.083 0.60 1.88300 40.8 16 -94.504 5.84 1.89286 20.4 17 -12.292 0.65 1.95375 32.3 18 -212.514 0.18 19 46.944 2.45 1.78472 25.7 20 -723.914 (variable) 21 -35.682 0.90 1.81600 46.6 22 128.627 2.22 1.92286 18.9 23 -195.186 (variable) 24 80.794 7.00 1.89190 37.1 25* -52.693 0.15 26 37.251 1.10 1.89286 20.4 27 19.691 7.54 1.69680 55.5 28 53.265 (variable) 29 (Aperture) ∞ 2.13 30 -187.673 2.00 1.84666 23.8 31 -58.254 0.90 1.81600 46.6 32 139.272 35.00 33 44.026 4.48 1.80518 25.4 34 -150.648 2.53 35 661.761 0.90 2.00100 29.1 36 21.270 7.63 1.49700 81.5 37 -66.012 0.20 38 -1853.388 4.60 1.48749 70.2 39 -27.955 0.90 1.88300 40.8 40 -313.116 0.65 41 42.360 5.99 1.61800 63.3 42 -53.282 4.00 43 ∞ 33.00 1.60859 46.4 44 ∞ 13.20 1.51633 64.1 45∞7.00 Image plane ∞ Aspheric data Page 13 K =-1.98844e+00 A 4= 7.87117e-06 A 6=-1.22539e-07 A 8= 2.94216e-09 A10=-3.94132e-11 A12= 3.02524e-13 A14=-1.29708e-15 A16= 2.41234e-18 Page 25 K =-1.65386e+00 A 4= 1.79075e-06 A 6=-1.27701e-08 A 8= 1.64963e-10 A10=-1.11398e-12 A12= 4.10809e-15 A14=-7.82974e-18 A16= 6.01640e-21 Various data Zoom ratio 25.91 Focal length 7.58 17.10 38.57 196.34 F-number 1.80 1.80 1.80 2.95 Half angle of view (°) 35.97 17.83 8.11 1.60 Image height 5.50 5.50 5.50 5.50 Lens total length 298.03 298.03 298.03 298.03 BF 7.00 7.00 7.00 7.00 d12 0.70 25.57 48.04 67.15 d20 73.35 32.22 10.30 3.55 d23 1.74 7.89 12.88 0.75 d28 4.43 14.56 9.02 8.78 Lens group data Group starting plane focal length 1 1 80.49 2 13 -14.47 3 21 -58.39 4 24 32.04 5 29 44.71 [Numerical example 6] Unit: mm Surface Data Surface number rd nd νd 1 6844.443 3.00 1.83481 42.7 2* 59.066 10.88 3 331.428 2.30 1.85478 24.8 4 114.762 9.53 1.43875 94.7 5 -159.231 2.99 6 102.450 11.62 1.43387 95.1 7 -101.356 3.79 8 78.335 7.57 1.43875 94.7 9* 199.521 1.45 10* 86.528 6.03 1.76385 48.5 11 -573.158 (variable) 12* 168.483 0.80 1.95375 32.3 13 14.163 6.44 14 -28.430 0.80 1.88300 40.8 15 -117.446 6.61 1.89286 20.4 16 -12.029 0.60 1.95375 32.3 17 546.801 0.18 18 59.873 3.88 1.72916 54.7 19 -46.246 (variable) 20 -33.172 0.75 1.72916 54.7 21 66.895 3.33 1.76182 26.5 22 -162.943 (variable) 23* 79.209 6.02 1.72916 54.7 24 -56.145 0.21 25 363.711 1.10 1.85478 24.8 26 34.422 7.83 1.72916 54.7 27 -82.536 (variable) 28 (Aperture) ∞ 2.89 29 38.937 6.92 1.76182 26.5 30 -42.985 0.90 1.88300 40.8 31 28.658 35.00 32 -509.758 3.19 1.78472 25.7 33 -41.649 1.21 34 -86.814 1.00 1.88300 40.8 35 23.117 6.68 1.49700 81.5 36 -38.636 0.35 37 37.465 5.92 1.43875 94.7 38 -30.367 1.00 2.00100 29.1 39 -1587.945 0.25 40 80.553 5.47 1.54814 45.8 41 -29.073 4.00 42 ∞ 33.00 1.60859 46.4 43 ∞ 13.20 1.51633 64.1 44∞6.70 Image plane ∞ Aspheric data 2nd side K = 0.00000e+00 A 4=-1.12936e-07 A 6= 4.60421e-11 A 8= 1.94184e-13 A10=-7.11742e-17 9th page K = 0.00000e+00 A 4=-1.86684e-06 A 6= 1.03061e-09 A 8=-7.08544e-12 A10= 1.15646e-14 A12=-9.29309e-18 A14= 3.73790e-21 A16=-5.61112e-25 Side 10 K = 0.00000e+00 A 4=-1.15556e-06 A 6= 5.07612e-10 A 8=-4.13561e-12 A10= 6.18471e-15 A12=-4.52503e-18 A14= 1.45630e-21 A16=-8.81204e-26 Side 12 K = 1.99863e+00 A 4= 1.01068e-05 A 6=-5.57571e-08 A 8= 1.45679e-09 A10=-2.09628e-11 A12= 1.52735e-13 A14=-5.62932e-16 A16= 8.44126e-19 Page 23 K = 1.48811e+00 A 4=-3.99094e-06 A 6= 2.67211e-09 A 8=-8.61326e-12 A10=2.61385e-14 A12=-3.08373e-17 Various data Zoom ratio 20.77 Focal length 6.50 13.88 20.77 135.00 F-number 1.80 1.80 1.80 3.10 Half angle of view (°) 40.24 21.62 14.83 2.33 Image height 5.50 5.50 5.50 5.50 Lens total length 295.01 295.01 295.01 295.01 BF 6.70 6.70 6.70 6.70 d11 0.68 19.51 29.21 54.54 d19 59.58 26.75 13.46 3.81 d22 8.39 11.80 14.28 0.48 d27 0.97 11.58 12.68 10.79 Lens group data Group starting plane focal length 1 1 57.22 2 12 -16.15 3 20 -60.32 4 23 35.54 5 28 44.11

[0058] [Table 1]

[0059] [Table 2]

[0060] [Imaging device] FIG. 13 shows an example configuration of an imaging device 125. In FIG. 13, 101 denotes a zoom lens according to any one of Examples 1 to 6. 124 denotes a camera body. The zoom lens 101 is detachable from the camera body 124. In this diagram, the first lens group L1 is designated as lens group F, the middle lens group M as lens group LZ, and the rear lens group LR as lens group R. SP denotes an aperture diaphragm, and 114 and 115 denote drive mechanisms for driving the focusing lens group and the zooming lens group LZ, respectively, and include helicoids, cams, etc. 116 to 118 denote motors (actuators) for driving the drive mechanisms 114 and 115 and the aperture diaphragm SP. 119 to 121 denote detectors for detecting the positions of the focusing lens group and lens group LZ and the aperture diameter of the aperture diaphragm SP, and are comprised of encoders, potentiometers, photosensors, etc.

[0061] In the camera 124, 109 is the glass block designated by P in Examples 1 to 6. 110 is an imaging element (photoelectric conversion element) such as a CCD sensor or CMOS sensor that photoelectrically converts (captures) the subject image formed by the zoom lens 101. 111 and 122 are processing units that perform various processes and controls in the camera 124 and the zoom lens 101, respectively, and include a processor such as a CPU.

[0062] By using the zoom lenses of the first to sixth embodiments described above, it is possible to provide a small and lightweight imaging device 125 that can obtain good captured images.

[0063] The above-described embodiment includes the following configurations.

[0064] (Configuration 1) A zoom lens having, arranged in order from an object side to an image side, a first lens group having positive refractive power and not moving for zooming, an intermediate group including three or more lens groups each moving for zooming, and a rear lens group having positive refractive power and not moving for zooming, The spacing between adjacent lens groups changes during zooming, The intermediate group is a first negative lens group consisting of a single lens group or two or more partial lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, and that has negative refractive power as a whole; the intermediate group includes a positive lens group having positive refractive power and a second negative lens group having negative refractive power, which are disposed successively in order from the image side to the object side, and which move during zooming; When the focal length of the first lens group is f1, the focal length of the rear lens group is fR, and the lateral magnification of the positive lens group at the wide-angle end is βPw, 1.00≦f1 / fR≦2.00 -5.00≦βPw≦-1.00 A zoom lens characterized by satisfying the following conditions: (Configuration 2) When the lateral magnification at the telephoto end of the positive lens group is βPt, 1.01≦βPt / βPw≦1.20 The zoom lens according to configuration 1, characterized in that the following condition is satisfied: (Configuration 3) When the focal length of the positive lens group is fP, 0.30≦fP / fR≦1.00 3. The zoom lens according to configuration 1 or 2, characterized in that the following conditions are satisfied: (Configuration 4) When the focal length of the second negative lens unit is fN, -3.00≦fN / fR≦-0.50 4. The zoom lens according to any one of configurations 1 to 3, wherein the following condition is satisfied: (Configuration 5) When the focal length of the positive lens group is fP and the focal length of the second negative lens group is fN, -1.00≦fP / fN≦-0.20 5. The zoom lens according to any one of configurations 1 to 4, wherein the following condition is satisfied: (Configuration 6) When the focal length of the first negative lens unit at the wide-angle end is fV and the focal length of the positive lens unit is fP, -4.00≦fP / fV≦-1.50 6. The zoom lens according to any one of configurations 1 to 5, wherein the following condition is satisfied: (Configuration 7) When the focal length of the first negative lens unit at the wide-angle end is fV and the focal length of the second negative lens unit is fN, 2.00≦fN / fV≦10.00 7. The zoom lens according to any one of configurations 1 to 6, wherein the following condition is satisfied: (Configuration 8) When the lateral magnification of the second negative lens unit at the wide-angle end is βNw, 0.20≦βNw≦0.80 8. The zoom lens according to any one of configurations 1 to 7, wherein the following condition is satisfied: (Configuration 9) When the lateral magnification of the first negative lens unit at the wide-angle end is βVw, -0.35≦βVw≦-0.15 9. The zoom lens according to any one of configurations 1 to 8, wherein the following condition is satisfied: (Configuration 10) When the average value of the refractive index at the d-line of one or more positive lenses included in the positive lens group is Ndp, 1.60≦NdPp≦1.90 10. The zoom lens according to any one of configurations 1 to 9, wherein the following condition is satisfied: (Configuration 11) When the average value of the Abbe numbers of one or more negative lenses included in the positive lens group with reference to the d-line is Ndn, 16.0≦NdPn≦30.0 11. The zoom lens according to any one of configurations 1 to 10, wherein the following condition is satisfied: (Configuration 12) The lateral magnification of the second negative lens unit at the wide-angle end is βNw, the zoom magnification from the wide-angle end to the telephoto end of the zoom lens is Z, and the zoom magnification is Z 0.25 is the zoom position at which the positive lens group is zoomed, βPz is the lateral magnification at the zoom position Za, and βNz is the lateral magnification at the zoom position Za of the second negative lens group. 1.20≦βPz / βPw×βNz / βNw≦1.60 12. The zoom lens according to any one of configurations 1 to 11, wherein the following condition is satisfied: (Configuration 13) a positive lens is disposed closest to the object side of the positive lens group, When the focal length of the positive lens closest to the object side is fPG1 and the focal length of the positive lens group is fP, 0.90≦fPG1 / fP≦1.80 13. The zoom lens according to any one of configurations 1 to 12, wherein the following condition is satisfied: (Configuration 14) In the intermediate group, the first negative lens group is composed of three negative lenses and two positive lenses, the second negative lens group is composed of one negative lens and one positive lens, 14. The zoom lens according to any one of configurations 1 to 13, wherein the positive lens group is made up of two positive lenses and one negative lens. (Configuration 15) In the intermediate group, the first negative lens group is composed of a first partial lens group and a second partial lens group as the partial lens groups, the first partial lens group is composed of one negative lens, the second lens subgroup is composed of two negative lenses and two positive lenses, the second negative lens group is composed of two negative lenses and one positive lens, 14. The zoom lens according to any one of configurations 1 to 13, wherein the positive lens group is made up of two positive lenses and one negative lens. (Configuration 16) the zoom lens according to any one of configurations 1 to 15; and an image sensor for capturing an image of a subject through the zoom lens.

[0065] The embodiments described above are merely representative examples, and various modifications and alterations are possible to each embodiment when implementing the present invention. [Explanation of symbols]

[0066] L1 First lens group M intermediate group LR rear lens group LV 1st negative lens group LN Second negative lens group LP positive lens group SP aperture stop I image plane

Claims

1. A zoom lens having, arranged in order from an object side to an image side, a first lens group having positive refractive power and not moving for zooming, an intermediate group including three or more lens groups each moving for zooming, and a rear lens group having positive refractive power and not moving for zooming, The spacing between adjacent lens groups changes during zooming, The intermediate group is a first intermediate group consisting of a single lens group or two or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, and that has negative refractive power as a whole; the intermediate group includes a positive lens group having positive refractive power and a second negative lens group having negative refractive power, which are disposed successively in order from the image side to the object side, and which move during zooming; When the focal length of the first lens group is f1, the focal length of the rear lens group is fR, and the lateral magnification of the positive lens group at the wide-angle end is βPw, 1.00≦f1 / fR≦2.00 -4.50≦βPw≦-1.00 A zoom lens characterized by satisfying the following conditions:

2. When the lateral magnification at the telephoto end of the positive lens group is βPt, 1.01≦βPt / βPw≦1.20 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

3. When the focal length of the positive lens group is fP, 0.30≦fP / fR≦1.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

4. When the focal length of the second negative lens unit is fN, -3.00≦fN / fR≦-0.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. When the focal length of the positive lens group is fP and the focal length of the second negative lens group is fN, -1.00≦fP / fN≦-0.20 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. When the focal length of the first intermediate lens unit at the wide-angle end is fV and the focal length of the positive lens unit is fP, -4.00≦fP / fV≦-1.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. When the focal length of the first intermediate lens unit at the wide-angle end is fV and the focal length of the second negative lens unit is fN, 2.00≦fN / fV≦10.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

8. When the lateral magnification of the second negative lens unit at the wide-angle end is βNw, 0.20≦βNw≦0.80 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

9. When the lateral magnification of the first intermediate lens unit at the wide-angle end is βVw, −0.35≦βVw≦−0.15 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

10. When the average value of the refractive index at the d-line of one or more positive lenses included in the positive lens group is NdPp, 1.60≦NdPp≦1.90 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

11. When the average value of the Abbe numbers of one or more negative lenses included in the positive lens group with reference to the d-line is NdPn, 16.0≦NdPn≦30.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

12. The lateral magnification of the second negative lens unit at the wide-angle end is βNw, the zoom magnification from the wide-angle end to the telephoto end of the zoom lens is Z, and the zoom magnification is Z ０．２５ is the zoom position at which the positive lens group is zoomed, βPz is the lateral magnification at the zoom position Za, and βNz is the lateral magnification at the zoom position Za of the second negative lens group. 1.20≦βPz / βPw×βNz / βNw≦1.60 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

13. a positive lens is disposed closest to the object side of the positive lens group, When the focal length of the positive lens closest to the object side is fPG1 and the focal length of the positive lens group is fP, 0.90≦fPG1 / fP≦1.80 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

14. In the intermediate group, the first intermediate lens group is composed of three negative lens elements and two positive lens elements, the second negative lens group is composed of one negative lens and one positive lens, 2. The zoom lens according to claim 1, wherein the positive lens group comprises two positive lenses and one negative lens.

15. In the intermediate group, the first intermediate group is made up of a lens group A and a lens group B, The lens group A is composed of one negative lens, The lens group B is composed of two negative lenses and two positive lenses, the second negative lens group is composed of two negative lenses and one positive lens, 2. The zoom lens according to claim 1, wherein the positive lens group comprises two positive lenses and one negative lens.

16. A zoom lens having, arranged in order from the object side to the image side, a first lens group having a positive refractive power that is fixed for zooming, an intermediate group including three or more lens groups that each move for zooming, and a rear lens group having a positive refractive power that is fixed for zooming, The spacing between adjacent lens groups changes during zooming, The intermediate group is a first intermediate group consisting of a single lens group or two or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, and that has negative refractive power as a whole; the intermediate group includes a positive lens group having positive refractive power and a second negative lens group having negative refractive power, which are disposed successively in order from the image side to the object side, and which move during zooming; Let f1 be the focal length of the first lens group, fR be the focal length of the rear lens group, βPw be the lateral magnification of the positive lens group at the wide-angle end, and NdPp be the average value of the refractive index at the d-line of one or more positive lenses included in the positive lens group. 1.00≦f1 / fR≦2.00 -5.00≦βPw≦-1.00 1.60≦NdPp≦1.90 A zoom lens characterized by satisfying the following conditions:

17. A zoom lens having, arranged in order from the object side to the image side, a first lens group having a positive refractive power that is fixed for zooming, an intermediate group including three or more lens groups that each move for zooming, and a rear lens group having a positive refractive power that is fixed for zooming, The spacing between adjacent lens groups changes during zooming, The intermediate group is a first intermediate group consisting of a single lens group or two or more lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, and that has negative refractive power as a whole; the intermediate group includes a positive lens group having positive refractive power and a second negative lens group having negative refractive power, which are disposed successively in order from the image side to the object side, and which move during zooming; the first intermediate lens group is composed of three negative lens elements and two positive lens elements, the second negative lens group is composed of one negative lens and one positive lens, the positive lens group is composed of two positive lenses and one negative lens, When the focal length of the first lens group is f1, the focal length of the rear lens group is fR, and the lateral magnification of the positive lens group at the wide-angle end is βPw, 1.00≦f1 / fR≦2.00 -5.00≦βPw≦-1.00 A zoom lens characterized by satisfying the following conditions:

18. A zoom lens having, arranged in order from the object side to the image side, a first lens group having a positive refractive power that is fixed for zooming, an intermediate group including three or more lens groups that each move for zooming, and a rear lens group having a positive refractive power that is fixed for zooming, The spacing between adjacent lens groups changes during zooming, The intermediate group is a first intermediate group consisting of a single lens group or two or more partial lens groups that move monotonically toward the image side during zooming from the wide-angle end to the telephoto end, and that has negative refractive power as a whole; the intermediate group includes a positive lens group having positive refractive power and a second negative lens group having negative refractive power, which are disposed successively in order from the image side to the object side, and which move during zooming; the first intermediate group is composed of lens group A and lens group B as the partial lens groups, The lens group A is composed of one negative lens, The lens group B is composed of two negative lenses and two positive lenses, the second negative lens group is composed of two negative lenses and one positive lens, the positive lens group is composed of two positive lenses and one negative lens, When the focal length of the first lens group is f1, the focal length of the rear lens group is fR, and the lateral magnification of the positive lens group at the wide-angle end is βPw, 1.00≦f1 / fR≦2.00 -5.00≦βPw≦-1.00 A zoom lens characterized by satisfying the following conditions:

19. a zoom lens according to any one of claims 1 to 18; and an image sensor for capturing an image of a subject through the zoom lens.

Images