Zoom lens and imaging device equipped with same

Abstract

[Problem] To provide a compact zoom lens which has high imaging performance and achieves a high variable power ratio, and an imaging device equipped with same. [Solution] This zoom lens includes, in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate group LM having one or more lens groups and having positive refractive power as a whole, a lens group LN-1 having negative refractive power, and a lens group LN having negative refractive power, wherein an interval between adjacent lens groups changes during zooming. The zoom lens satisfies a predetermined conditional expression.

Description

Zoom lens and imaging device having the same

[0001] The present invention relates to a zoom lens and an imaging device having the same, which is suitable for use in electronic cameras such as video cameras and digital still cameras, film cameras, broadcast cameras, and the like.

[0002] 2. Description of the Related Art Imaging devices such as digital cameras and video cameras require zoom lenses that are highly compact, cover a wide range from wide-angle to telephoto, and have high imaging performance throughout the entire zoom range.

[0003] In recent years, imaging devices such as cameras using solid-state imaging elements or silver halide film have become more sophisticated and smaller overall. Furthermore, the size of the imaging elements used in imaging devices has been miniaturized to obtain high-resolution images. Accordingly, photographic optical systems used in imaging devices are required to have high resolving power up to high spatial frequencies, which is one of the criteria for evaluating resolving power.

[0004] Furthermore, in a compact imaging device system, since the imaging device itself is small, even a zoom lens with a large zoom ratio is required to have a small overall optical length.

[0005] Conventionally, zoom lens systems that include a lens group having positive refractive power on the object side are advantageous for achieving high magnification, and various proposals have been made for such systems.

[0006] For example, Patent Document 1 proposes a five-group zoom lens system with a positive-negative-positive-negative-positive configuration. This type of zoom lens system increases the number of lens groups that move during zooming, thereby increasing the degree of freedom in aberration correction, thereby achieving both high imaging performance throughout the entire zoom range and compactness.

[0007] JP 2009-175324 A

[0008] Meanwhile, there is a demand for zoom lenses that not only have high imaging performance but also have telephoto capabilities. In particular, there is a strong demand for telephoto zoom lenses with a focal length close to 400 mm. The zoom lens described in Patent Document 1 has a focal length at the telephoto end of less than 320 mm when converted into a 35 mm film format, which does not fully meet the demand for telephoto capabilities, and a zoom lens with a higher zoom ratio is required.

[0009] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a zoom lens that has high imaging performance, achieves a high zoom ratio, and is compact, and an image pickup apparatus having the same.

[0010] According to one aspect of the present invention, there is provided a zoom lens comprising, arranged in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate group LM having one or more lens groups and having positive refractive power overall, a lens group LN-1 having negative refractive power, and a lens group LN having negative refractive power, wherein the spacing between adjacent lens groups changes during zooming, and wherein the zoom lens satisfies the following conditional expressions: 4.75<f1 / fw<10.00, -0.080<f2 / ft<-0.040, and 10.0<ft / fw<20.0, where fw is the focal length of the entire system at the wide-angle end, ft is the focal length of the entire system at the telephoto end, f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.

[0011] Other objects and features of the present invention are illustrated in the following examples.

[0012] According to the present invention, it is possible to provide a zoom lens that has high imaging performance, realizes a high zoom ratio, and is compact, and an imaging apparatus having the same.

[0013] FIG. 1 is a lens cross-sectional view of a zoom lens of Example 1 at a wide-angle end. FIG. 2 is a lens cross-sectional view of a longitudinal aberration diagram of a zoom lens of Example 1 at a wide-angle end. FIG. 3 is a lens cross-sectional view of a zoom lens of Example 2 at a wide-angle end. FIG. 4 is a lens cross-sectional view of a zoom lens of Example 2 at a wide-angle end. FIG. 5 is a lens cross-sectional view of a zoom lens of Example 3 at a wide-angle end. FIG. 6 is a lens cross-sectional view of a zoom lens of Example 3 at a wide-angle end. FIG. 7 is a lens cross-sectional view of a zoom lens of Example 3 at a wide-angle end. FIG. 8 is a lens cross-sectional view of a zoom lens of Example 4 at a wide-angle end. FIG. 9 is a lens cross-sectional view of a zoom lens of Example 4 at a telephoto end. FIG. 10 is a lens cross-sectional view of a zoom lens of Example 5 at a wide-angle end. FIG. 11 is a lens cross-sectional view of a zoom lens of Example 5 at a wide-angle end. FIG. 12 is a lens cross-sectional view of a zoom lens of Example 6 at a wide-angle end. 10A and 10B are diagrams illustrating longitudinal aberration at the wide-angle end of the zoom lens of Example 6. FIG. 10B are diagrams illustrating longitudinal aberration at the telephoto end of the zoom lens of Example 6. FIG. 10C are schematic diagrams illustrating an imaging apparatus according to the present embodiment.

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Each embodiment relates to a zoom lens and an image pickup apparatus having the same.

[0015] FIG. 1 is a cross-sectional view of a zoom lens according to a first embodiment of the present invention when focused on an object at infinity at the wide-angle end (short focal length end).

[0016] FIG. 2 is a longitudinal aberration diagram when the zoom lens of Example 1 is focused on an object at infinity at the wide-angle end.

[0017] FIG. 3 is a longitudinal aberration diagram when the zoom lens of Example 1 is focused on an object at infinity at the telephoto end (long focal length end).

[0018] FIG. 4 is a cross-sectional view of a zoom lens according to a second embodiment of the present invention when the zoom lens is focused on an object at infinity at the wide-angle end.

[0019] FIG. 5 is a longitudinal aberration diagram when the zoom lens of Example 2 is focused on an object at infinity at the wide-angle end.

[0020] FIG. 6 is a longitudinal aberration diagram when the zoom lens of Example 2 is focused on an object at infinity at the telephoto end.

[0021] FIG. 7 is a cross-sectional view of a zoom lens according to a third embodiment of the present invention when the zoom lens is focused on an object at infinity at the wide-angle end.

[0022] FIG. 8 is a longitudinal aberration diagram when the zoom lens of Example 3 is focused on an object at infinity at the wide-angle end.

[0023] FIG. 9 is a longitudinal aberration diagram when the zoom lens of Example 3 is focused on an object at infinity at the telephoto end.

[0024] FIG. 10 is a cross-sectional view of a zoom lens according to a fourth embodiment of the present invention when the zoom lens is focused on an object at infinity at the wide-angle end.

[0025] FIG. 11 is a longitudinal aberration diagram when the zoom lens of Example 4 is focused on an object at infinity at the wide-angle end.

[0026] FIG. 12 is a longitudinal aberration diagram when the zoom lens of Example 4 is focused on an object at infinity at the telephoto end.

[0027] FIG. 13 is a cross-sectional view of a zoom lens according to a fifth embodiment of the present invention when the zoom lens is focused on an object at infinity at the wide-angle end.

[0028] FIG. 14 is a longitudinal aberration diagram when the zoom lens of Example 5 is focused on an object at infinity at the wide-angle end.

[0029] FIG. 15 is a longitudinal aberration diagram when the zoom lens of Example 5 is focused on an object at infinity at the telephoto end.

[0030] FIG. 16 is a cross-sectional view of a zoom lens according to a sixth embodiment of the present invention when the zoom lens is focused on an object at infinity at the wide-angle end.

[0031] FIG. 17 is a longitudinal aberration diagram when the zoom lens of Example 6 is focused on an object at infinity at the wide-angle end.

[0032] FIG. 18 is a longitudinal aberration diagram when the zoom lens of Example 6 is focused on an object at infinity at the telephoto end.

[0033] FIG. 19 is a schematic diagram of an imaging device.

[0034] The zoom lens of each embodiment is a photographic lens system used in image pickup devices such as video cameras, digital cameras, and silver halide film cameras.

[0035] In the lens cross-sectional view, the left is the object side (front) and the right is the image side (rear). In the lens cross-sectional view, i indicates the order of the lens groups from the object side, and Li is the i-th lens group. SP is the aperture stop. IP is the image plane, which is placed on the imaging surface of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor when used as a photographic optical system for a video camera or digital still camera, or on a photosensitive surface corresponding to the film surface when used in a silver halide film camera.

[0036] In the aberration diagrams, d and g represent the d-line and g-line, respectively. ΔM and ΔS represent the meridional image plane and the sagittal image plane, and lateral chromatic aberration is represented by the g-line.

[0037] ω is the half angle of view, and Fno is the F-number.

[0038] In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when each lens group is located at either end of the range in which it can mechanically move on the optical axis.

[0039] The arrows indicate the movement locus of each lens group during zooming from the wide-angle end to the telephoto end.

[0040] In Examples 1 and 5 shown in FIGS. 1 and 13, focusing is performed by moving the fourth lens unit L4 in the optical axis direction. In Example 2 shown in FIG. 4, focusing is performed by moving the fourth lens unit L4 and the fifth lens unit L5 in the optical axis direction. In Examples 3 and 4 shown in FIGS. 1 and 13, focusing is performed by moving the sixth lens unit L6 in the optical axis direction. In Example 6 shown in FIG. 16, focusing is performed by moving the fifth lens unit L5 in the optical axis direction.

[0041] Incidentally, focusing may be performed by moving the entire zoom lens or any one of the lens groups.

[0042] In Examples 1 to 6, the vibration-reduction lens group IS moves so as to have a component in a direction approximately perpendicular to the optical axis, displacing the image in a direction approximately perpendicular to the optical axis, thereby correcting image blur when the entire zoom lens vibrates.

[0043] Next, features of each embodiment other than those described above will be described.

[0044] In a positive-lead zoom lens, an important challenge is to achieve good optical performance over the entire object distance while achieving a high zoom ratio and compactness of the entire lens system. To achieve this challenge, it is important to appropriately set the refractive power and lens configuration of each lens group, as well as the movement conditions of each lens group during zooming.

[0045] Unless these configurations are appropriately set, it becomes extremely difficult to obtain a zoom lens that has high optical performance over the entire zoom range while maintaining a high zoom ratio.

[0046] In order to solve the above problems, one aspect of the present invention provides a zoom lens system that includes, arranged in order from the object side to the image side, a first lens unit L1 having positive refractive power and a second lens unit L2 having negative refractive power. The zoom lens system further includes, arranged on the image side of the second lens unit L2, an intermediate lens unit LM having positive refractive power overall, a lens unit LN-1 having negative refractive power, and a lens unit LN having negative refractive power. The spacing between adjacent lens units changes during zooming, and the following conditions are set:

[0047] Each embodiment of the present invention is characterized in that it satisfies the following condition: 4.75<f1 / fw<10.00 (1) where fw is the focal length of the entire system at the wide-angle end and f1 is the focal length of the first lens unit L1.

[0048] Conditional expression (1) defines the focal length of the first lens unit L1. Satisfying conditional expression (1) facilitates the implementation of a telephoto-type power arrangement at the telephoto end, thereby shortening the overall optical length at the telephoto end, minimizing fluctuations in aberrations throughout the entire zoom range, and achieving high optical performance across the entire image field. If the refractive power of the first lens unit L1 becomes too weak by exceeding the upper limit of conditional expression (1), the amount of movement of the first lens unit L1 must be increased for zooming, which undesirably increases the overall lens length at the telephoto end. It also makes it difficult to reduce the diameter of the front lens element. If the refractive power of the first lens unit L1 becomes too strong by exceeding the lower limit of conditional expression (1), this is advantageous for achieving a high zoom ratio, but makes it difficult to correct spherical aberration at the telephoto end.

[0049] When the focal length of the entire system at the telephoto end is ft and the focal length of the second lens unit L2 is f2, the following condition is satisfied: -0.080<f2 / ft<-0.040 (2)

[0050] Conditional expression (2) defines the focal length of the second lens unit L2. Satisfying conditional expression (2) facilitates the creation of a retrofocus-type power arrangement at the wide-angle end, thereby achieving both a wider angle of view at the wide-angle end and high optical performance across the entire image plane with minimal fluctuations in aberrations across the entire zoom range. If the refractive power of the second lens unit L2 becomes too strong, exceeding the upper limit of conditional expression (2), the refractive power of the second lens unit L2 becomes too strong, making it difficult to reduce fluctuations in spherical aberration and lateral chromatic aberration that occur during zooming. Furthermore, the divergence effect of the second lens unit on the axial light beam becomes too great, making it difficult to reduce the size of the subsequent lens groups. If the refractive power of the second lens unit L2 becomes too small, exceeding the lower limit of conditional expression (2), it becomes difficult to create a retrofocus-type power arrangement at the wide-angle end, making it difficult to widen the angle of view at the wide-angle end.

[0051] The present invention is characterized in that the following conditional expression is satisfied: 10.0<ft / fw<20.0 (3) where fw is the focal length of the entire system at the wide-angle end and ft is the focal length of the entire system at the telephoto end. By ensuring that the corresponding value of conditional expression (3) is not below the lower limit, an optical system with a higher zoom ratio can be provided. By ensuring that the corresponding value of conditional expression (3) is not above the upper limit, the zoom ratio does not become too high, which is advantageous for size reduction.

[0052] It is also preferable that the second lens unit L2 includes a positive lens, which makes it possible to effectively correct chromatic aberration of magnification at the wide-angle end, which occurs due to the negative lens disposed in the second lens unit having negative refractive power.

[0053] In the optical system of each embodiment, it is preferable to satisfy one or more of the following conditional expressions, whereby the effects corresponding to each conditional expression can be obtained.

[0054] When the average Abbe number of the positive lenses constituting the first lens unit L1 is vd1p, it is preferable to satisfy the following condition: 70.0<vd1p<95.0 (4).

[0055] Condition (4) defines the Abbe number of the positive lens in the first lens unit L1.

[0056] By satisfying conditional expression (4), axial chromatic aberration and lateral chromatic aberration at the telephoto end can be corrected satisfactorily.

[0057] When the focal length of the lens unit LN is fN, it is preferable to satisfy the following condition: −1.50<fN / ft<−0.10 (5).

[0058] Conditional expression (5) defines the focal length of the lens unit LN. If the refractive power of the lens unit LN becomes too strong, exceeding the upper limit of conditional expression (5), it becomes difficult to correct curvature of field at the wide-angle end. Furthermore, the exit pupil becomes too short at the wide-angle end, causing the incident light beam to be obliquely incident on the solid-state image sensor, making shading more noticeable. If the refractive power of the lens unit LN becomes too weak, exceeding the lower limit of conditional expression (5), it becomes difficult to achieve a telephoto-type power arrangement, and it becomes difficult to shorten the overall optical length at the telephoto end.

[0059] When the back focus at the wide-angle end is skw, it is preferable to satisfy the following condition: 0.30<skw / fw<0.70 (6) Condition (6) defines the ratio between the focal length of the entire system at the wide-angle end and the back focus. By satisfying condition (6), it is possible to obtain good optical performance while miniaturizing the optical system.

[0060] When the focal length of the lens unit LN-1 is fN-1, it is preferable to satisfy the following conditional expression: -0.30<fN-1 / ft<-0.05 (7). Conditional expression (7) is used to appropriately set the focal length of the lens unit LN-1. By satisfying conditional expression (7), it is possible to achieve both compactness and good optical performance when the lens unit LF is used as a focus lens unit. If the upper limit of conditional expression (7) is exceeded, the refractive power of the lens unit LN-1 becomes too strong, making it difficult to correct lateral chromatic aberration and field curvature. If the lower limit is exceeded, the refractive power of the lens unit LN-1 becomes too weak, increasing the amount of movement during focusing and resulting in large aberration fluctuations during close focusing.

[0061] When the focal length of the vibration reduction lens group IS is represented by fIS, it is preferable to satisfy the following condition: 0.10<fIS / ft<0.20 (8).

[0062] Conditional expression (8) defines the focal length of the image stabilization lens group IS. If the refractive power of the image stabilization lens group IS becomes too weak by exceeding the upper limit of conditional expression (8), the amount of movement during image stabilization becomes large, making it difficult to reduce the lens outer diameter. If the refractive power of the image stabilization lens group IS becomes too strong by exceeding the lower limit, decentering coma and asymmetric curvature of field occur, making it difficult to obtain good image stabilization performance.

[0063] When the movement amount of the first lens unit L1 from the wide-angle end to the telephoto end is m1, it is preferable to satisfy the following conditional expression: 3.00<m1 / fw<4.50 (9). Conditional expression (9) defines the movement amount of the first lens unit L1 from the wide-angle end to the telephoto end. If the upper limit of conditional expression (9) is exceeded and the movement amount of the first lens unit L1 becomes too large, the total optical length at the telephoto end becomes too long, and the optical system becomes large. In addition, the zoom torque during zooming becomes too heavy. If the movement amount of the first lens unit L1 becomes too small and the upper limit is exceeded, the refractive power of the first lens unit L1 becomes too strong in order to ensure the zoom ratio, making it difficult to correct spherical aberration and chromatic aberration at the telephoto end.

[0064] When the focal length of the intermediate unit LM at the wide-angle end is fMw, it is preferable to satisfy the following condition: 0.060<fMw / ft<0.130 (10). Condition (10) defines the focal length of the intermediate unit LM. If the upper limit of condition (10) is exceeded and the refractive power of the intermediate unit LM becomes too weak, it becomes difficult to obtain a zoom ratio exceeding 10. If the lower limit is exceeded and the refractive power of the intermediate unit LM becomes too strong, it becomes difficult to suppress zoom fluctuations of spherical aberration and correct spherical aberration at the wide-angle end.

[0065] When the total optical length at the telephoto end is TLt, it is preferable to satisfy the following conditional expression: 0.55<TLt / ft<0.85 (11). Conditional expression (11) defines the ratio between the total optical length at the telephoto end and the focal length of the entire system at the telephoto end. By satisfying conditional expression (11), it is possible to achieve good optical performance while realizing a compact optical system.

[0066] When the composite focal length of the lens units located closer to the image than the intermediate unit LM at the wide-angle end is fMRw, it is preferable to satisfy the following condition: -1.70<fMRw / fw<-0.80 (12). Condition (12) defines the composite focal length of the lens units (lens unit LN-1 and lens unit LN) located closer to the image than the intermediate unit LM at the wide-angle end. If the upper limit of condition (12) is exceeded and the refractive power of the subsequent unit becomes too strong, it becomes difficult to correct curvature of field at the wide-angle end. Furthermore, the exit pupil becomes too short at the wide-angle end, causing the incident light beam to be obliquely incident on the solid-state image sensor, making shading more noticeable. If the lower limit is exceeded and the refractive power of the subsequent unit becomes too weak, it becomes difficult to shorten the overall optical length.

[0067] When the composite focal length of the lens units closer to the image side than the intermediate unit LM at the wide-angle end is fMRw, and the focal length of the intermediate unit LM at the wide-angle end is fMw, it is desirable to satisfy the following condition: -1.40<fMRw / fMw<-0.50 (13) Condition (13) defines the ratio of the focal lengths of the intermediate unit LM and the subsequent unit. If the upper limit of condition (13) is exceeded, the refractive power of the subsequent unit becomes too strong, making it difficult to correct curvature of field. If the lower limit is exceeded, the refractive power of the intermediate unit becomes too strong, making it difficult to correct spherical aberration.

[0068] When the focal length of the first lens group is f1 and the focal length of the second lens group is f2, it is preferable to satisfy the following condition: -8.00<f1 / f2<-6.00 (14).

[0069] Conditional expression (14) defines the ratio of the focal lengths of the first lens unit L1 and the second lens unit L2. If the upper limit of conditional expression (14) is exceeded and the refractive power of the first lens unit L1 becomes too strong, it becomes difficult to correct spherical aberration at the telephoto end. If the lower limit is exceeded and the refractive power of the second lens unit L2 becomes too strong, it becomes difficult to correct fluctuations in field curvature during zooming.

[0070] When the focal length of the middle lens unit LM at the wide-angle end is fMw and the focal length of the second lens unit L2 is f2, it is preferable to satisfy the following conditional expression: -2.50<fMw / f2<-1.00 (15) Conditional expression (15) defines the ratio of the focal lengths of the middle lens unit LM and the second lens unit L2. If the upper limit of conditional expression (15) is exceeded and the refractive power of the middle lens unit LM becomes too strong, it becomes difficult to correct spherical aberration at the wide-angle end. If the lower limit is exceeded and the refractive power of the second lens unit L2 becomes too strong, it becomes difficult to correct fluctuations in field curvature during zooming.

[0071] When the focal length of the intermediate unit LM at the wide-angle end is fMw and the focal length of the lens unit LN-1 is fN-1, it is preferable to satisfy the following conditional expression: -2.10<fN-1 / fMw<-1.00 (16) Conditional expression (16) defines the ratio of the focal lengths of the intermediate unit LM and the lens unit LN-1. If the upper limit of conditional expression (16) is exceeded and the refractive power of the lens unit LN-1 becomes too strong, it becomes difficult to correct curvature of field at the wide-angle end. If the lower limit is exceeded and the refractive power of the intermediate unit LM becomes too strong, it becomes difficult to correct spherical aberration at the wide-angle end.

[0072] When the focal length of the intermediate unit LM at the wide-angle end is fMw and the focal length of the lens unit LN is fN, it is preferable to satisfy the following conditional expression: -12.00<fN / fMw<-2.00 (17) Conditional expression (17) defines the ratio of the focal lengths of the intermediate unit LM and the lens unit LN. If the upper limit of conditional expression (17) is exceeded and the refractive power of the lens unit LN becomes too strong, it becomes difficult to correct curvature of field at the wide-angle end. If the lower limit is exceeded and the refractive power of the intermediate unit LM becomes too strong, it becomes difficult to correct spherical aberration at the wide-angle end.

[0073] When the focal length of the lens unit LN-1 is fN-1 and the focal length of the lens unit LN is fN, it is preferable to satisfy the following conditional expression: 0.08<fN-1 / fN<0.70 (18). Conditional expression (18) defines the ratio of the focal lengths of the lens unit LN-1 and the lens unit LN. If the upper limit of conditional expression (18) is exceeded and the refractive power of the lens unit LN-1 becomes too weak, when the lens unit LN-1 is used as a focus lens unit, the amount of movement during focusing becomes large, resulting in large aberration fluctuations during close focusing. If the lower limit is exceeded and the refractive power of the lens unit LN-1 becomes too strong, it becomes difficult to correct chromatic aberration of magnification and focus fluctuations due to curvature of field.

[0074] When the focal length of the second lens unit L2 is f2 and the focal length of the lens unit LN is fN, it is preferable to satisfy the following conditional expression: 0.030<f2 / fN<0.250 (19). Conditional expression (19) defines the ratio of the focal lengths of the second lens unit L2 and the lens unit LN. If the upper limit of conditional expression (19) is exceeded and the refractive power of the lens unit LN becomes too strong, it becomes difficult to correct curvature of field at the wide-angle end. If the lower limit is exceeded and the refractive power of the second lens unit becomes too strong, it becomes difficult to correct fluctuations in curvature of field during zooming.

[0075] When the lateral magnification of the lens unit LN-1 at the telephoto end is βN-1t and the lateral magnification of the lens unit LN-1 at the wide-angle end is βN-1w, it is preferable to satisfy the following conditional expression: 1.00<βN-1t / βN-1w<2.00 (20) Conditional expression (20) defines the magnification sharing of the lens unit LN-1. By satisfying conditional expression (20), it is possible to obtain good optical performance while miniaturizing the optical system.

[0076] When the lateral magnification of the lens unit LN at the telephoto end is βNt and the lateral magnification of the lens unit LN at the wide-angle end is βNw, it is preferable to satisfy the following conditional expression: 0.80<βNt / βNw<1.60 (21) Conditional expression (21) defines the magnification sharing of the lens unit LN. By satisfying conditional expression (21), it is possible to obtain good optical performance while miniaturizing the optical system.

[0077] When the focal length of the intermediate unit LM at the wide-angle end is fMw and the focal length of the vibration-reduction lens unit IS is fIS, it is preferable to satisfy the following conditional expression: 0.45<fMw / fIS<1.00 (22) Conditional expression (22) defines the focal length of the vibration-reduction lens unit IS. If the upper limit of conditional expression (22) is exceeded and the refractive power of the vibration-reduction lens unit becomes too strong, decentering coma and asymmetric curvature of field occur, making it difficult to obtain good vibration-reduction performance. If the lower limit is exceeded and the refractive power of the vibration-reduction lens unit becomes too weak, the amount of movement during vibration reduction becomes large, making it difficult to reduce the lens outer diameter.

[0078] In each embodiment, it is preferable to set the numerical ranges of the above-mentioned conditional expressions (1) to (22) as follows:

[0079] 4.80<f1 / fw<8.00...(1a) -0.070<f2 / ft<-0.045...(2a) 12.0<ft / fw<18.0...(3a) 72.0<vd<90.0...(4a) -1.30<fN / ft<-0.15...(5a) 0.33<skw / fw<0.65...(6a) -0.25<fN-1 / ft<-0.10...(7a) 0.11<fIS / ft<0.18...(8a) 3.20<m1 / fw<4.20...(9a) 0.070<fMw / ft<0.125...(10a) 0.60<TLt / ft<0.80...(11a) -1.60<fMRw / fw<-0.90...(12a) -1.30<fMRw / fMw<-0.60...(13a) -7.50<f1 / f2<-6.20...(14a) -2.40<fMw / f2<-1.20...(15a) -2.00<fN-1 / fMw<-1.20...(16a) -11.50<fN / fMw<-2.30...(17a) 0.10<fN-1 / fN<0.65...(18a) 0.040<f2 / fN<0.230...(19a) 1.10<βN-1t / βN-1w<1.90...(20a) 0.90<βNt / βNw<1.50 (21a) 0.50<fMw / fIS<0.90 (22a) It is more preferable to set the numerical ranges of the above-mentioned conditional expressions (1) to (22) as follows:

[0080] 4.82<f1 / fw<6.00...(1b) -0.060<f2 / ft<-0.050...(2b) 13.0<ft / fw<15.0...(3b) 74.0<vd<85.0...(4b) -1.10<fN / ft<-0.20...(5b) 0.36<skw / fw<0.60...(6b) -0.20<fN-1 / ft<-0.12...(7b) 0.12<fIS / ft<0.16...(8b) 3.30<m1 / fw<4.00...(9b) 0.080<fMw / ft<0.120...(10b) 0.65<TLt / ft<0.75...(11b) -1.50<fMRw / fw<-1.00...(12b) -1.20<fMRw / fMw<-0.70...(13b) -7.00<f1 / f2<-6.40...(14b) -2.20<fMw / f2<-1.40...(15b) -1.90<fN-1 / fMw<-1.24...(16b) -11.00<fN / fMw<-2.50...(17b) 0.12<fN-1 / fN<0.60...(18b) 0.050<f2 / fN<0.210...(19b) 1.20<βN-1t / βN-1w<1.80...(20b) 1.00<βNt / βNw<1.40 (21b) 0.55<fMw / fIS<0.85 (22b) As described above, according to each embodiment, it is possible to provide a zoom lens having high imaging performance, realizing a high zoom ratio, and being compact, as well as an imaging device having the same.

[0081] In the zoom lens of each embodiment, it is preferable to vapor-deposit a fluorine coating on at least one of the object-side surface of the lens positioned closest to the object and the image-side surface of the lens positioned closest to the image. Because the object-side surface of the lens positioned closest to the object and the image-side surface of the lens positioned closest to the image are easily exposed to the outside world, vapor-depositing a fluorine coating can improve water and oil repellency, suppress flare, and achieve high optical performance. In particular, because the object-side surface of the lens positioned closest to the object has a large diameter, it is preferable to vapor-deposit a fluorine coating.

[0082] In the zoom lenses of each embodiment, the positive and negative lenses constituting the cemented lens are preferably bonded together with an adhesive having an axial thickness of 0.005 mm or more and 0.05 mm or less. If it is less than 0.005 mm, the adhesive is prone to peeling, and if it is more than 0.03 mm, the axial distance from the surface of the cemented lens closest to the object to the surface closest to the image becomes long, resulting in a long overall lens length. More preferably, it should be 0.008 mm or more and 0.02 mm or less.

[0083] At least one lens element in the zoom lens of each embodiment is provided with an anti-reflection coating for preventing reflection, and the anti-reflection coating is composed of multiple films. Here, when the refractive index of the film closest to the air interface is Nd, the anti-reflection coating PC preferably has an Nd of 1.32 or less. By setting Nd to 1.32 or less, the difference in refractive index with air can be reduced, thereby further reducing light reflection and reducing ghosting. Specific examples of the configuration of the anti-reflection coating PC include, but are not limited to, multilayer films formed using a wet method, as described in JP 2012-230211 A and JP 2014-95877 A. More preferably, setting Nd to 1.30 or less can further reduce ghosting.

[0084] Here, it is preferable to provide an anti-reflection coating PC on the image-side surface of the negative lens element with a concave surface facing the image side among the negative lenses arranged in the zoom lens.Light reflected by the negative lens element with a concave surface facing the image side tends to be reflected at a large angle with respect to the normal direction of the surface of the negative lens element with a concave surface facing the image side, and therefore tends to have a high reflectance.

[0085] Furthermore, since light reflected by a negative lens with a concave surface facing the image side tends to be focused on the image plane, ghosts tend to be noticeable. Therefore, applying an anti-reflection coating PC to the image-side surface of a negative lens with a concave surface facing the image side can reduce ghosts.

[0086] It is particularly preferable to provide an anti-reflection coating PC on the negative lens located closest to the object in the second lens group.

[0087] Numerical Examples 1 to 6 corresponding to Examples 1 to 6, respectively, are shown below. In each numerical example, i indicates the order of the surface from the object side, ri indicates the radius of curvature of the ith surface (i-th surface), di indicates the distance between the ith surface and the (i+1)th surface, ndi and vdi indicate the refractive index and Abbe number based on the d-line, respectively. f indicates the focal length, and Fno indicates the F-number.

[0088] If the optical surface is aspherical, a * symbol is added to the right of the surface number. The aspherical shape is expressed as follows: x = (h 2 / R) / [1+{1-(1+k)(h / R) 2} 1 / 2 ]+A4×h 4 + A6 x h 6 +A8 x h 8 + A10 x h 10 + A12 x h 12 In addition, "e±XX" in each aspherical coefficient is "×10± ＸＸ " means.

[0089] The lens construction length represents the distance on the optical axis from the surface closest to the object to the surface closest to the image in each lens group.

[0090] The relationship between the above-mentioned conditional expressions and various numerical values ​​in the numerical examples is shown in Table 1. [Example 1] In Fig. 1, L1 is a first lens group having positive refractive power, L2 is a second lens group having negative refractive power, L3 is a third lens group (middle group LM) having positive refractive power, L4 is a fourth lens group (lens group LN-1) having negative refractive power, and L5 is a fifth lens group (lens group LN) having negative refractive power.

[0091] The first lens unit L1 is composed of, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

[0092] The second lens unit L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspherical surface formed on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0093] The third lens unit L3 includes, in order from the object side, a biconvex positive lens, a positive meniscus lens with a convex surface facing the object side, and a cemented negative lens formed by cementing together a positive meniscus lens with a convex surface facing the object side and a negative meniscus lens with a convex surface facing the object side.

[0094] Furthermore, on the image side of the cemented negative lens, there is a cemented positive lens cemented together a negative meniscus lens with a convex surface facing the object side and a biconvex positive lens, and a cemented negative lens cemented together a biconcave negative lens and a biconvex positive lens with an aspherical surface formed on the image side.Furthermore, on the image side of the cemented negative lens, there is a cemented positive lens cemented together a negative meniscus lens with a convex surface facing the object side and a biconvex positive lens.

[0095] The fourth lens unit L4 is composed of, in order from the object side, a cemented negative lens in which a biconvex positive lens and a biconcave negative lens are cemented together.

[0096] The fifth lens unit L5 is composed of, in order from the object side, a biconvex positive lens, and a negative meniscus lens with its concave surface facing the object side and an aspherical surface formed on its object side.

[0097] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0098] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side as shown by the arrows. The second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1. The third lens unit L3 moves toward the object side while decreasing the distance between it and the second lens unit L2. The fourth lens unit L4 moves toward the object side while increasing the distance between it and the third lens unit L3. The fifth lens unit L5 moves toward the object side while increasing the distance between it and the fourth lens unit L4.

[0099] The aperture stop SP moves together with the third lens unit L3.

[0100] The vibration-reduction lens group IS is a cemented positive lens formed by cementing together a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, and moves so as to have a component in a direction approximately perpendicular to the optical axis, thereby displacing the image in a direction approximately perpendicular to the optical axis and correcting image blur when the entire zoom lens vibrates.

[0101] Focusing is performed by moving the fourth lens unit L4 toward the image side. [Numerical Example 1] Numerical Example 1 corresponding to Example 1 is as follows. Unit: mm Surface Data Surface Number rd nd νd Pitch Diameter 1 168.758 1.85 1.91082 35.2 65.14 2 89.764 8.31 1.49700 81.5 64.01 3 -605.497 0.15 63.85 4 83.297 6.94 1.49700 81.5 62.35 5 870.619 (Variable) 61.77 6* 152.791 0.05 1.58946 30.6 34.11 7 106.926 1.00 1.75500 52.3 34.07 8 21.768 7.71 27.77 9 -44.683 0.90 1.77250 49.6 27.07 10 108.211 0.15 26.13 11 47.208 5.10 1.77830 23.9 25.84 12 -51.849 2.93 25.17 13 -24.448 0.90 1.77250 49.6 22.90 14 -74.239 (Variable) 22.69 15 (Aperture) ∞ 0.40 23.70 16 32.181 4.98 1.48749 70.2 25.02 17 -101.649 0.15 25.03 18 42.818 2.28 1.48749 70.2 24.72 19 118.396 0.15 24.42 20 21.475 5.35 1.51823 58.9 23.50 21 6697.926 1.00 1.83481 42.7 22.35 22 20.359 2.75 20.45 23 35.535 1.00 2.00069 25.5 20.45 24 21.611 4.77 1.63930 44.9 19.88 25 -93.585 2.44 19.62 26 -26.740 1.00 1.81600 46.6 19.17 27 24.727 5.80 1.58313 59.4 19.89 28* -65.360 0.13 20.83 29 33.535 1.10 1.80400 46.5 21.85 30 21.241 8.85 1.58313 59.4 21.62 31 -27.494 (variable) 21.79 32 230.759 2.54 1.84666 23.8 21.77 33 -55.269 0.80 1.70154 41.2 21.71 34 30.810 (variable) 21.39 35 71.151 4.05 1.53172 48.8 29.28 36 -94.689 8.78 29.42 37* -26.644 1.60 1.80400 46.5 29.36 38 -76.837 (variable) 31.07 Image surface ∞ Aspheric data Surface 6 K = 0.00000e+00 A4= 3.83583e-06 A6=-4.89664e-10 A8= 2.81674e-11 A10=-1.08555e-13 A12= 2.38728e-16 Surface 28 K = 0.00000e+00 A 4= 1.34099e-05 A 6= 1.27757e-08 A 8= 9.54950e-11 A10=-7.67410e-13 A12= 2.63160e-15 Surface 37 K = 0.00000e+00 A 4= 9.72747e-06 A 6= 8.48098e-09 A 8=-4.03322e-11 A10= 2.11232e-13 A12=-3.66054e-16 Various data Zoom ratio 13.42 Wide angle Medium Telephoto Focal length 28.90 105.93 388.00 F number 3.37 5.36 6.49 Half angle of view 33.71 11.54 3.16 Image height 19.28 21.64 21.39 Total lens length 173.50 222.63 282.93 BF 14.73 36.49 45.07 d 5 1.00 43.23 89.39 d14 39.98 13.43 2.54 d31 1.49 11.00 3.27 d34 20.39 22.58 46.74 d38 14.73 36.49 45.07 Zoom Lens Group Data Group Initial Surface Focal Length 1 1 143.15 2 6 -20.96 3 15 36.00 4 32 -61.33 5 35 -251.41 Single Lens Data Lens Initial Surface Focal Length 1 1 -212.92 2 2 157.92 3 4 184.79 4 6 -604.52 5 7 -36.38 6 9 -40.83 7 11 32.48 8 13 -47.56 9 16 50.76 10 18 136.25 11 20 41.56 12 21 -24.46 13 23 -57.17 14 24 27.91 15 26 -15.61 16 27 31.51 17 29 -75.06 18 30 22.02 19 32 52.88 20 33 -28.09 21 35 77.06 22 37 -51.46 [Example 2] In Figure 4, L1 is a first lens group with positive refractive power, L2 is a second lens group with negative refractive power, and L3 is a third lens group with positive refractive power. L4 is the fourth lens group with positive refractive power, L5 is the fifth lens group (lens group LN-1) with negative refractive power, and L6 is the sixth lens group (lens group LN) with negative refractive power.

[0102] The third and fourth lens groups are the intermediate lens group LM.

[0103] The first lens unit L1 is composed of, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

[0104] The second lens unit L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspherical surface formed on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0105] The third lens unit L3 includes, in order from the object side, a biconvex positive lens, a positive meniscus lens with a convex surface facing the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens, and a cemented positive lens formed by cementing a negative meniscus lens with a convex surface facing the object side and a biconvex positive lens. Further, on the image side of the cemented positive lens, there is a cemented negative lens formed by cementing a biconcave negative lens and a biconvex positive lens with an aspherical surface formed on the image side. The fourth lens unit L4 includes, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens with a convex surface facing the object side and a biconvex positive lens.

[0106] The fifth lens unit L5 is composed of, in order from the object side, a cemented negative lens formed by cementing together a biconvex positive lens and a biconcave negative lens.

[0107] The sixth lens unit L6 is composed of, in order from the object side, a biconvex positive lens, and a negative meniscus lens with its concave surface facing the object side and an aspherical surface formed on its object side.

[0108] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0109] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side as shown by the arrows. The second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1. The third lens unit L3 moves toward the object side while decreasing the distance between it and the second lens unit L2.

[0110] The fourth lens unit L4 moves toward the object side while increasing the distance between it and the third lens unit L3. The fifth lens unit L5 moves toward the object side while increasing the distance between it and the fourth lens unit L4. The sixth lens unit L6 moves toward the object side while increasing the distance between it and the fifth lens unit L5.

[0111] The aperture stop SP moves together with the third lens unit L3.

[0112] The vibration-reduction lens group IS is a cemented positive lens formed by cementing together a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, and moves so as to have a component in a direction approximately perpendicular to the optical axis, thereby displacing the image in a direction approximately perpendicular to the optical axis and correcting image blur when the entire zoom lens vibrates.

[0113] Focusing is performed by moving the fourth lens unit L4 toward the object side and the fifth lens unit L5 toward the image side. [Numerical Example 2] Numerical Example 2 corresponding to Example 2 is as follows.

[0114] Unit: mm Surface Data Surface Number rd nd νd Pitch Diameter 1 186.979 1.85 1.95375 32.3 65.11 2 99.214 7.68 1.53775 74.7 64.12 3 -600.997 0.15 63.96 4 93.708 6.11 1.53775 74.7 62.51 5 772.080 (Variable) 61.98 6* 271.468 0.05 1.58946 30.6 35.89 7 152.510 1.00 1.76385 48.5 35.83 8 23.533 7.65 29.38 9 -54.298 0.90 1.76385 48.5 28.80 10 100.603 0.15 27.83 11 47.732 5.12 1.79631 22.6 27.54 12 -65.368 3.83 26.87 13 -25.807 0.90 1.76385 48.5 23.91 14 -76.285 (Variable) 23.70 15 (Aperture) ∞ 0.40 24.11 16 34.492 4.77 1.51633 64.1 25.35 17 -109.203 0.15 25.36 18 39.244 2.57 1.51633 64.1 25.01 19 121.652 0.15 24.66 20 22.769 5.14 1.51742 52.4 23.66 21 -2159.302 1.00 1.83481 42.7 22.53 22 21.642 2.54 20.66 23 34.614 1.00 2.00069 25.5 20.57 24 20.482 5.01 1.63930 44.9 19.88 25 -90.992 2.17 19.54 26 -30.523 1.00 1.81554 44.4 19.02 27 19.998 6.37 1.58313 59.4 19.35 28* -76.397 (Variable) 20.16 29 31.495 1.10 1.76385 48.5 21.25 30 20.758 8.47 1.53996 59.5 21.42 31 -29.023 (Variable) 22.31 32 143.085 3.09 1.85478 24.8 22.23 33 -46.847 0.80 1.72342 38.0 22.12 34 26.199 (variable) 21.56 35 78.782 4.31 1.60342 38.0 30.48 36 -84.392 8.31 30.66 37* -28.291 1.60 1.80400 46.5 30.59 38 -96.921 (variable) 32.36 Image surface ∞ Aspheric data Surface 6 K = 0.00000e+00 A4= 3.77899e-06 A6=-6.89162e-10 A8= 1.59375e-11 A10=-5.29178e-14 A12= 9.86025e-17 Surface 28 K = 0.00000e+00 A4= 1.05910e-05 A 37th surface K = 0.00000e+00 A 4= 8.98490e-06 A 6= 6.31025e-09 A 8=-4.00895e-11 A10= 2.20453e-13 A12=-4.05114e-16 Various data Zoom ratio 13.44 Wide-angle Mid-range Telephoto Focal length 28.87 105.89 388.00 F-number 3.34 5.16 6.49 Half angle of view 34.20 11.55 3.18 Image height 19.62 21.64 21.59 Total lens length 173.50 222.29 280.50 BF 12.64 35.69 47.17 d 5 1.00 46.37 91.38 d14 41.94 14.86 2.55 d28 1.22 1.35 1.40 d31 1.50 10.35 4.53 d34 19.88 18.35 38.12 d38 12.64 35.69 47.17 Zoom Lens Group Data Group Initial Surface Focal Length 1 1 146.45 2 6 -21.80 3 15 55.76 4 29 32.72 5 32 -54.12 6 35 -396.05 Single Lens Data Lens Initial Surface Focal Length 1 1 -223.93 2 2 158.97 3 4 197.71 4 6 -590.52 5 7 -36.55 6 9 -46.05 7 11 35.35 8 13 -51.46 9 16 51.35 10 18 111.02 11 20 43.58 12 21 -25.66 13 23 -51.97 14 24 26.62 15 26 -14.68 16 27 27.86 17 29 -83.42 18 30 23.84 19 32 41.60 20 33 -23.12 21 35 68.20 22 37 -50.21 [Example 3] In Figure 7, L1 is a first lens group with positive refractive power, L2 is a second lens group with negative refractive power, L3 is a third lens group with positive refractive power, and L4 is a fourth lens group with negative refractive power. L5 is the fifth lens unit with positive refractive power, L6 is the sixth lens unit (lens unit LN-1) with negative refractive power, and L7 is the seventh lens unit (lens unit LN) with negative refractive power.

[0115] The third to fifth lens groups constitute an intermediate lens group LM.

[0116] The first lens unit L1 is composed of, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

[0117] The second lens unit L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspherical surface formed on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0118] The third lens unit L3 is composed of, in order from the object side, a biconvex positive lens, a positive meniscus lens with its convex surface facing the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens, and a cemented positive lens formed by cementing a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens.

[0119] The fourth lens unit L4 is composed of, from the object side, a cemented negative lens formed by cementing together a biconcave negative lens and a biconvex positive lens with an aspherical surface formed on the image side. The fifth lens unit L5 is composed of, from the object side, a cemented positive lens formed by cementing together a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens.

[0120] The sixth lens unit L6 is composed of, in order from the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens.

[0121] The seventh lens group L7 is composed of, in order from the object side, a biconvex positive lens, a negative meniscus lens with its concave surface facing the object side, and a negative lens with a negative meniscus shape with its concave surface facing the object side and an aspherical surface formed on its object side.

[0122] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0123] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side as shown by the arrows. The second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1. The third lens unit L3 moves toward the object side while decreasing the distance between it and the second lens unit L2.

[0124] The fourth lens unit L4 moves toward the object side while increasing the distance between it and the third lens unit L3. The fifth lens unit L5 moves toward the object side while decreasing the distance between it and the fourth lens unit L4. The sixth lens unit L6 moves toward the object side while increasing the distance between it and the fifth lens unit L5. The seventh lens unit L7 moves toward the object side while increasing the distance between it and the sixth lens unit L6.

[0125] The aperture stop SP moves together with the third lens unit L3.

[0126] The vibration-reduction lens group IS is a cemented positive lens formed by cementing together a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, and moves so as to have a component in a direction approximately perpendicular to the optical axis, thereby displacing the image in a direction approximately perpendicular to the optical axis and correcting image blur when the entire zoom lens vibrates.

[0127] Focusing is performed by moving the sixth lens unit L6 toward the image side.

[0128] Numerical Example 3 Numerical Example 3 corresponding to Example 3 is as follows.

[0129] Unit: mm Surface Data Surface Number rd nd νd Pitch Diameter 1 159.863 1.85 1.91082 35.2 65.11 2 86.107 8.43 1.49700 81.5 63.93 3 -725.282 0.15 63.76 4 83.091 7.04 1.49700 81.5 62.32 5 1015.161 (Variable) 61.74 6* 96.905 0.05 1.58946 30.6 35.11 7 73.732 1.00 1.75500 52.3 35.05 8 20.213 9.19 28.04 9 -38.607 0.90 1.77250 49.6 26.52 10 106.233 0.15 25.58 11 46.649 5.03 1.77830 23.9 25.32 12 -50.254 2.67 24.68 13 -24.024 0.90 1.77250 49.6 22.94 14 -58.905 (Variable) 22.80 15 (Aperture) ∞ 0.40 24.16 16 32.428 4.97 1.48749 70.2 25.48 17 -115.098 0.15 25.47 18 33.549 3.06 1.48749 70.2 25.09 19 121.535 0.15 24.66 20 27.969 4.96 1.51742 52.4 23.79 21 -118.758 1.00 1.83481 42.7 22.77 22 23.716 2.52 21.03 23 39.097 1.00 2.00069 25.5 21.04 24 21.303 4.95 1.70000 48.1 20.44 25 -107.828 (Variable) 20.19 26 -33.576 1.00 1.77250 49.6 19.38 27 21.327 6.19 1.58313 59.4 19.75 28* -79.673 (variable) 20.45 29 34.656 1.10 1.80400 46.5 23.83 30 23.384 7.94 1.58313 59.4 23.95 31 -36.925 (variable) 24.54 32 273.941 2.52 1.84666 23.8 24.40 33 -68.322 0.80 1.71700 47.9 24.33 34 33.877 (variable) 23.94 35 87.748 5.80 1.51633 64.1 28.63 36 -37.582 2.54 28.88 37 -78.988 1.00 1.75500 52.3 27.99 38 -375.941 9.19 28.06 39* -19.835 1.60 1.80400 46.5 28.08 40 -38.559 (variable) 30.58 Image surface ∞ Aspheric data Surface 6 K = 0.00000e+00 A4= 4.16182e-06 A6=-1.01293e-09 A8= 3.04594e-11 A10=-1.26477e-13 A12= 2.74307e-16 Surface 28 K = 0.00000e+00 A 4= 9.02768e-06 A 6= 6.78154e-09 A 8=-9.06375e-11 A10= 1.09121e-12 A12=-3.94638e-15 Surface 39 K = 0.00000e+00 A 4= 9.10460e-06 A 6= 2.48299e-08 A 8=-7.07897e-11 A10= 5.35600e-13 A12=-7.60518e-16 Various data Zoom ratio 13.43 Wide angle Medium Telephoto Focal length 28.90 105.98 388.00 F-number 3.26 5.31 6.49 Half angle of view 34.94 11.54 3.19 Image height 20.19 21.64 21.64 Total lens length 173.50 216.82 282.06 BF 15.53 33.81 49.89 d 5 1.00 41.32 88.39 d14 38.52 10.49 2.53 d25 2.17 2.75 3.13 d28 1.95 1.37 0.99 d31 1.49 15.15 1.50 d34 12.62 11.71 35.41 d40 15.53 33.81 49.89 Zoom Lens Group Data Group Initial Surface Focal Length 1 1 141.94 2 6 -21.11 3 15 33.10 4 26 -42.24 5 29 35.27 6 32 -62.32 7 35 -306.59 Singlet Lens Data Lens Initial Surface Focal Length 1 1 -207.38 2 2 155.40 3 4 181.63 4 6 -523.50 5 7 -37.18 6 9 -36.56 7 11 31.81 8 13 -53.12 9 16 52.48 10 18 93.99 11 20 44.26 12 21 -23.60 13 23 -48.13 14 24 25.82 15 26 -16.75 16 27 29.52 17 29 -93.49 18 30 25.80 19 32 64.81 20 33 -31.48 21 35 51.78 22 37 -132.64 23 39 -52.82 [Example 4] In Figure 10, L1 is the first lens group with positive refractive power, L2 is the second lens group with negative refractive power, and L3 is the third lens group with positive refractive power. L4 is the fourth lens group with negative refractive power, L5 is the fifth lens group with positive refractive power, L6 is the sixth lens group (lens group LN-1) with negative refractive power, and L7 is the seventh lens group (lens group LN) with negative refractive power. The third to fifth lens groups form an intermediate group LM.

[0130] The first lens unit L1 is composed of, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

[0131] The second lens unit L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspherical surface formed on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0132] The third lens unit L3 is composed of, in order from the object side, a biconvex positive lens, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens, and a cemented positive lens formed by cementing a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens.

[0133] The fourth lens unit L4 is composed of a negative meniscus lens with a concave surface facing the object side. The fifth lens unit L5 is composed of, in order from the object side, a biconvex positive lens with aspherical surfaces formed on both sides, and a cemented positive lens formed by cementing together a negative meniscus lens with a convex surface facing the object side and a biconvex positive lens.

[0134] The sixth lens unit L6 is composed of, in order from the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens.

[0135] The seventh lens unit L7 is composed of, in order from the object side, a biconvex positive lens, an object, and a negative lens having a negative meniscus shape with its concave surface facing the object side and an aspherical surface formed on its object side. SP is an aperture stop, which is located on the object side of the third lens unit L3.

[0136] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side as shown by the arrows. The second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1. The third lens unit L3 moves toward the object side while decreasing the distance between it and the second lens unit L2. The fourth lens unit L4 moves toward the object side while increasing the distance between it and the third lens unit L3.

[0137] The fifth lens unit L5 moves toward the object side while decreasing the distance between it and the fourth lens unit L4. The sixth lens unit L6 moves toward the object side while decreasing the distance between it and the fifth lens unit L5. The seventh lens unit L7 moves toward the object side while increasing the distance between it and the sixth lens unit L6.

[0138] The aperture stop SP moves together with the third lens unit L3.

[0139] The vibration-reduction lens group IS is a cemented positive lens formed by cementing together a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, and moves so as to have a component in a direction approximately perpendicular to the optical axis, thereby displacing the image in a direction approximately perpendicular to the optical axis and correcting image blur when the entire zoom lens vibrates.

[0140] Focusing is performed by moving the sixth lens unit L6 toward the image side. Numerical Example 4 Numerical Example 4 corresponding to Example 4 is as follows.

[0141] Unit: mm Surface Data Surface Number rd nd νd Pitch Diameter 1 166.687 1.85 1.91082 35.2 63.80 2 88.826 7.91 1.49700 81.5 61.52 3 -549.982 0.15 60.88 4 80.882 6.23 1.49700 81.5 58.71 5 605.897 (Variable) 58.15 6* 167.160 0.05 1.58946 30.6 32.88 7 104.545 1.00 1.77250 49.6 32.82 8 21.610 8.00 26.93 9 -41.826 0.90 1.77250 49.6 25.41 10 122.590 0.15 24.56 11 50.249 4.67 1.77830 23.9 24.27 12 -47.783 2.24 23.64 13 -23.207 0.90 1.72916 54.7 22.55 14 -61.582 (Variable) 22.36 15(Aperture) ∞ 0.40 21.07 16 26.236 5.23 1.61772 49.8 22.15 17 -65.669 0.15 21.91 18 29.387 5.15 1.67270 32.1 20.62 19 -33.203 1.00 2.00100 29.1 19.61 20 24.162 2.17 18.14 21 37.849 1.00 2.00069 25.5 18.31 22 22.195 4.12 1.63930 44.9 17.96 23 -79.831 (Variable) 17.88 24 -23.992 1.00 1.75500 52.3 17.30 25 -1671.541 (Variable) 17.84 26* 33.180 4.72 1.53775 74.7 18.65 27* -45.660 0.15 19.22 28 6947.270 1.10 1.77250 49.6 19.58 29 47.494 5.82 1.48749 70.2 20.01 30 -21.736 (variable) 20.71 31 103.253 2.79 1.85478 24.8 20.60 32 -53.745 0.80 1.76200 40.1 20.47 33 27.562 (variable) 19.99 34 73.440 2.61 1.67270 32.1 29.14 35 -6331.920 7.14 29.20 36* -23.993 1.60 1.80400 46.5 29.45 37 -60.068 (variable) 31.52 Image surface ∞ Aspheric surface data Surface 6 K = 0.00000e+00 A 4= 5.20706e-06 A 6=-9.02718e-10 A 8= 3.96956e-11 A10=-1.72026e-13 A12= 4.24840e-16 Surface 26 K = 0.00000e+00 A 4=-1.12675e-05 A 6= 5.61282e-08 A 8=-1.09114e-09 A10= 8.74791e-12 A12=-5.31082e-14 27th surface K = 0.00000e+00 A 4= 2.44648e-05 A 6= 5.54986e-08 A 8=-8.11706e-10 A10= 5.89464e-12 A12=-4.05971e-14 36th surface K = 0.00000e+00 A 4= 1.21610e-05 A 6= 2.24346e-08 A 8=-1.37031e-10 A10= 6.55396e-13 A12=-1.05185e-15 Various data Zoom ratio 13.45 Wide angle Medium Telephoto Focal length 28.85 105.72 388.00 F-number 3.70 5.76 7.31 Half angle of view 34.03 11.57 3.14 Image height 19.48 21.64 21.29 Total lens length 163.50 210.40 263.50 BF 11.90 30.91 41.58 d 5 1.00 48.07 89.67 d14 38.84 13.83 2.55 d23 2.72 3.04 3.72 d25 2.00 1.68 1.00 d30 1.50 8.41 1.50 d33 24.56 23.47 42.48 d37 11.90 30.91 41.58 Zoom Lens Group Data Group Initial Surface Focal Length 1 1 142.38 2 6 -21.52 3 15 35.92 4 24 -32.25 5 26 24.48 6 31 -58.16 7 34 -111.29 Single Lens Data Lens Initial Surface Focal Length 1 1 -211.17 2 2 154.51 3 4 187.07 4 6 -473.61 5 7 -35.45 6 9 -40.27 7 11 32.14 8 13 -51.58 9 16 31.02 10 18 23.97 11 19 -13.85 12 21 -55.40 13 22 27.60 14 24 -32.25 15 26 36.50 16 28 -61.91 17 29 31.46 18 31 41.69 19 32 -23.81 20 34 107.94 21 36 -50.69 [Example 5] In FIG. 13, L1 is a first lens group with positive refractive power, L2 is a second lens group with negative refractive power, L3 is a third lens group (middle group LM) with positive refractive power, L4 is a fourth lens group (lens group LN-1) with negative refractive power, and L5 is a fifth lens group (lens group LN) with negative refractive power.

[0142] The first lens unit L1 is composed of, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

[0143] The second lens unit L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspherical surface formed on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0144] The third lens unit L3 includes, in order from the object side, a biconvex positive lens, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens, and a cemented positive lens formed by cementing a negative meniscus lens with its convex surface facing the object side to a biconvex positive lens. On the image side of the cemented positive lens, there is a biconcave negative lens, a biconvex positive lens with aspherical surfaces on both sides, and a cemented positive lens formed by cementing a biconcave negative lens and a biconvex positive lens. The fourth lens unit L4 includes, in order from the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens.

[0145] The fifth lens unit L5 is composed of, in order from the object side, a biconvex positive lens, and a negative meniscus lens with its concave surface facing the object side and an aspherical surface formed on its object side.

[0146] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0147] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side as shown by the arrows. The second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1. The third lens unit L3 moves toward the object side while decreasing the distance between it and the second lens unit L2. The fourth lens unit L4 moves toward the object side while increasing the distance between it and the third lens unit L3. The fifth lens unit L5 moves toward the object side while increasing the distance between it and the fourth lens unit L4.

[0148] The aperture stop SP moves together with the third lens unit L3.

[0149] The vibration-reduction lens group IS is a cemented positive lens formed by cementing together a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, and moves so as to have a component in a direction approximately perpendicular to the optical axis, thereby displacing the image in a direction approximately perpendicular to the optical axis and correcting image blur when the entire zoom lens vibrates.

[0150] Focusing is performed by moving the fourth lens unit L4 toward the image side. Numerical Example 5 Numerical Example 5 corresponding to Example 5 is as follows.

[0151] Unit: mm Surface Data Surface Number rd nd νd Pitch Diameter 1 158.894 1.85 1.91082 35.2 63.80 2 85.971 8.01 1.49700 81.5 61.45 3 -614.819 0.15 60.67 4 79.731 5.83 1.49700 81.5 55.83 5 623.231 (Variable) 55.06 6* 144.821 0.05 1.58946 30.6 32.28 7 95.969 1.00 1.77250 49.6 32.21 8 20.722 7.78 26.34 9 -44.587 0.90 1.72916 54.7 24.88 10 91.207 0.15 23.88 11 43.841 4.50 1.75575 24.7 23.57 12 -54.530 2.18 22.87 13 -23.027 0.90 1.72916 54.7 22.14 14 -57.713 (Variable) 21.95 15 (Aperture) ∞ 0.40 19.21 16 23.103 4.99 1.51823 58.9 19.89 17 -57.291 0.15 19.62 18 23.158 4.99 1.72825 28.5 18.59 19 -32.934 1.00 2.00100 29.1 17.54 20 19.492 2.34 16.00 21 36.457 1.00 1.92286 20.9 16.15 22 21.447 3.52 1.61340 44.3 15.88 23 -84.290 2.55 15.80 24 -22.581 1.00 1.75500 52.3 15.49 25 207.087 1.00 16.00 26* 29.929 5.10 1.53775 74.7 17.16 27* -34.246 0.15 18.23 28 -1089.056 1.10 1.72916 54.7 18.64 29 41.178 5.64 1.48749 70.2 19.12 30 -21.757 (Variable) 19.82 31 73.525 2.51 1.85478 24.8 19.84 32 -80.488 0.80 1.76200 40.1 19.68 33 25.382 (Variable) 19.21 34 227.047 2.87 1.85478 24.8 29.47 35 -90.756 3.28 29.64 36* -24.616 1.60 1.88202 37.2 29.64 37 -75.705 (variable) 31.71 Image surface ∞ Aspheric data Surface 6 K = 0.00000e+00 A 4= 5.45719e-06 A 6=-7.50113e-10 A 8= 3.28006e-11 A10=-1.38107e-13 A12= 3.97489e-16 Surface 26 K = 0.00000e+00 A 4=-1.90883e-05 A 6= 1.11710e-07 A 8=-2.04761e-09 A10= 2.31153e-11 A12=-1.17407e-13 27th surface K = 0.00000e+00 A 4= 2.21989e-05 A 6= 8.71479e-08 A 8=-1.34283e-09 A10= 1.45609e-11 A12=-7.44549e-14 36th surface K = 0.00000e+00 A 4= 1.21548e-05 A 6= 1.66728e-08 A 8=-8.88282e-11 A10= 4.16987e-13 A12=-6.51728e-16 Various data Zoom ratio 13.45 Wide angle Medium Telephoto Focal length 28.85 105.83 388.00 F-number 4.12 6.32 8.24 Half angle of view 34.34 11.55 3.15 Image height 19.71 21.64 21.38 Total lens length 161.50 207.66 259.50 BF 12.32 33.25 47.08 d 5 1.00 47.20 87.67 d14 39.70 14.67 2.56 d30 1.50 9.00 2.62 d33 27.69 24.25 40.28 d37 12.32 33.25 47.08 Zoom Lens Group Data Group Initial Surface Focal Length 1 1 139.93 2 6 -21.22 3 15 32.73 4 31 -60.19 5 34 -103.50 Single Lens Data Lens Initial Surface Focal Length 1 1 -208.18 2 2 152.34 3 4 183.31 4 6 -482.83 5 7 -34.41 6 9 -40.96 7 11 32.80 8 13 -53.13 9 16 32.46 10 16 , L1 is the first lens unit with positive refractive power, L2 is the second lens unit with negative refractive power, L3 is the third lens unit with positive refractive power, L4 is the fourth lens unit with positive refractive power, L5 is the fifth lens unit (lens unit LN-1) with negative refractive power, and L6 is the sixth lens unit (lens unit LN) with negative refractive power. The third and fourth lens groups are the intermediate group LM.

[0152] The first lens unit L1 is composed of, in order from the object side, a cemented positive lens formed by cementing a negative meniscus lens having a convex surface facing the object side and a biconvex positive lens, and a positive meniscus lens having a convex surface facing the object side.

[0153] The second lens unit L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspherical surface formed on the object side, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0154] The third lens unit L3 includes, in order from the object side, a biconvex positive lens, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens, and, on the image side of the cemented negative lens, a cemented positive lens formed by cementing a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, a biconvex positive lens, and a cemented negative lens formed by cementing a biconcave negative lens and a biconvex positive lens.

[0155] The fourth lens group L4 is composed of, from the object side, a biconvex positive lens with aspherical surfaces on both sides, a cemented positive lens formed by cementing a biconcave negative lens and a biconvex positive lens, and a biconvex positive lens. The fifth lens group L5 is composed of, from the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens.

[0156] The sixth lens unit L6 is composed of, in order from the object side, a positive meniscus lens with a concave surface facing the object side, and a negative meniscus lens with a concave surface facing the object side and an aspherical surface formed on the object side.

[0157] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0158] During zooming from the wide-angle end to the telephoto end, the first lens unit L1 moves toward the object side as shown by the arrow, and the second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1.

[0159] The third lens unit L3 moves toward the object side while decreasing the distance between it and the second lens unit L2. The fourth lens unit L4 moves toward the object side while decreasing the distance between it and the third lens unit L3. The fifth lens unit L5 moves toward the object side while decreasing the distance between it and the fourth lens unit L4. The sixth lens unit L6 moves toward the object side while increasing the distance between it and the fifth lens unit L5.

[0160] The vibration-reduction lens group IS consists of a cemented positive lens, consisting of a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens, and a biconvex positive lens. The vibration-reduction lens group IS is moved so that it has a component in the direction approximately perpendicular to the optical axis, displacing the image in the direction approximately perpendicular to the optical axis, thereby correcting image blur caused when the entire zoom lens vibrates. In other words, vibration reduction is performed.

[0161] Focusing is performed by moving the fifth lens unit L5 toward the image side. Numerical Example 6 Numerical Example 6 corresponding to Example 6 is as follows.

[0162] Unit: mm Surface Data Surface Number rd nd νd Pitch Diameter 1 154.352 1.85 1.95375 32.3 64.42 2 94.121 7.65 1.49700 81.5 63.06 3 -717.085 0.15 62.85 4 87.077 6.20 1.49700 81.5 61.34 5 604.310 (Variable) 60.78 6* 156.274 0.05 1.58946 30.6 31.64 7 116.244 1.00 1.77250 49.6 31.59 8 22.189 7.05 26.29 9 -46.946 0.90 1.77250 49.6 25.17 10 133.903 0.15 24.32 11 46.917 4.84 1.75575 24.7 23.93 12 -44.952 1.44 23.20 13 -25.820 0.90 1.77250 49.6 22.69 14 -144.002 (Variable) 22.24 15 (Aperture) ∞ 0.40 21.75 16 42.353 3.90 1.80100 35.0 22.53 17 -72.791 0.15 22.48 18 37.317 4.41 1.51633 64.1 21.66 19 -52.372 1.00 2.00100 29.1 20.95 20 38.991 1.96 20.26 21 58.535 1.00 1.92286 20.9 20.46 22 32.714 3.85 1.51633 64.1 20.28 23 -76.287 0.15 20.35 24 779.423 1.45 1.85478 24.8 20.29 25 -120.770 2.68 20.24 26 -32.624 1.00 1.76385 48.5 19.86 27 67.829 2.31 2.00069 25.5 20.34 28 -139.445 (Variable) 20.44 29* 161.058 5.62 1.53775 74.7 26.07 30* -31.726 0.15 27.10 31 -52.146 1.10 2.00100 29.1 27.31 32 1435.075 2.54 1.49700 81.5 28.40 33 -78.122 0.15 28.96 34 94.303 7.26 1.48749 70.2 30.50 35 -31.867 (Variable) 31.00 36 821.199 3.35 1.85478 24.8 28.04 37 -51.276 0.80 1.76385 48.5 27.91 38* 37.541 (Variable) 27.19 39 -178.968 1.70 1.85478 24.8 28.64 40 -79.599 3.64 28.88 41* -24.200 1.60 1.88202 37.2 28.93 42 -40.969 (Variable) 31.18 Image surface ∞ Aspheric data Surface 6 K = 0.00000e+00 A 4= 3.20237e-06 A 6= 8.46229e-10 A 8= 3.27575e-11 A10=-1.79922e-13 A12= 4.76949e-16 29th side K = 0.00000e+00 A 4=-8.38926e-06 A 6= 1.96612e-08 A 8=-3.03253e-10 A10= 1.59460e-12 A12=-3.56219e-15 30th side K = 0.00000e+00 A 4= 7.19901e-06 A 6= 2.47272e-08 A 8=-3.06372e-10 A10= 1.57687e-12 A12=-3.26561e-15 Surface 38 K = 0.00000e+00 A 4=-1.31223e-06 A 6=-6.92521e-09 A 8= 8.13712e-11 A10=-3.90562e-13 A12= 5.94240e-16 Page 41 K = 0.00000e+00 A 4= 2.14371e-06 A 6= 7.49319e-09 A 8=-4.93415e-11 A10= 3.14079e-13 A12=-6.84197e-16 Various data Zoom ratio 13.45 Wide-angle Mid-range Telephoto Focal length 28.85 105.81 388.00 F-number 2.99 5.33 6.49 Half angle 34.50 11.56 3.19 Image height 19.83 21.64 21.64 Lens length 163.50 224.51 268.50 BF 10.92 39.03 48.18 d 5 1.00 51.33 93.14 d14 27.73 16.68 2.56 d28 17.83 3.27 1.24 d35 14.29 5.75 1.50 d38 7.38 24.09 37.54 d42 10.92 39.03 48.18 Zoom Lens Group Data Group Initial Surface Focal Length 1 1 145.22 2 6 -21.27 3 15 51.64 4 29 38.07 5 36 -57.23 6 39 -123.43 Single Lens Data Lens Initial Surface Focal Length 1 1 -256.75 2 2 167.93 3 4 203.89 4 6 -770.23 5 7 -35.66 6 9 -44.90 7 11 31.08 8 13 -40.86 9 16 33.94 10 18 42.92 11 19 -22.21 12 21 -81.89 13 22 44.88 14 24 122.42 15 26 -28.72 16 27 45.86 17 29 49.80 18 31 -50.25 19 32 149.16 20 34 49.80 21 36 56.56 22 37 -28.26 23 39 166.40 24 41 -70.17 .

[0163]

[0164] Next, an embodiment in which the zoom lens of the present invention is used as a photographing optical system will be described with reference to FIG.

[0165] In Figure 19, 10 is a diagram showing an example of an imaging device, 11 is a photographic optical system constituted by the zoom lens of the present invention, and 12 is a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor that receives the subject image formed by the photographic optical system 11. Also, 13 is a recording means that records the subject image received by the image sensor 12, and 14 is a finder for observing the subject image displayed on a display element (not shown). The display element is constituted by a liquid crystal panel or the like, and displays the subject image formed on the image sensor 12.

[0166] In this way, by applying the zoom lens of the present invention to an optical device such as a digital camera, an optical device with high optical performance can be realized.

[0167] The present invention can also be applied to a camera without a quick return mirror.

[0168] The zoom lens of the present invention can also be applied to a video camera.

[0169] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention.

Claims

1. A zoom lens comprising, arranged in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate group LM having one or more lens groups and having positive refractive power overall, a lens group LN-1 having negative refractive power, and a lens group LN having negative refractive power, wherein the spacing between adjacent lens groups changes during zooming, and wherein the zoom lens satisfies the following conditional expressions: 4.75<f1 / fw<10.00 -0.080<f2 / ft<-0.040 10.0<ft / fw<20.0, where fw is the focal length of the entire system at the wide-angle end, ft is the focal length of the entire system at the telephoto end, f1 is the focal length of the first lens group, and f2 is the focal length of the second lens group.

2. The zoom lens according to claim 1, wherein the following condition is satisfied: 70.0<vd1p<95.0, where vd1p is the average Abbe number of the positive lenses constituting the first lens group.

3. The zoom lens according to claim 1 or 2, wherein the following condition is satisfied: -1.50<fN / ft<-0.10, where fN is the focal length of the lens unit LN.

4. A zoom lens according to any one of claims 1 to 3, characterized in that the following condition is satisfied: 0.30<skw / fw<0.70, where skw is the back focus at the wide-angle end.

5. A zoom lens according to any one of claims 1 to 4, characterized in that the following condition is satisfied: -0.30<fN-1 / ft<-0.05, where fN-1 is the focal length of the lens unit LN-1.

6. The zoom lens according to any one of claims 1 to 5, characterized in that it has an image stabilizing lens group IS that moves during image blur correction so as to include a component in a direction perpendicular to the optical axis, and where fIS is the focal length of the image stabilizing lens group IS, it satisfies the condition: 0.10<fIS / ft<0.

20.

7. A zoom lens according to any one of claims 1 to 6, characterized in that the following condition is satisfied: 3.00<m1 / fw<4.50, where m1 is the amount of movement of the first lens group from the wide-angle end to the telephoto end.

8. A zoom lens according to any one of claims 1 to 7, wherein the following condition is satisfied: 0.060<fMw / ft<0.130, where fMw is the focal length of the intermediate unit LM at the wide-angle end.

9. A zoom lens according to any one of claims 1 to 8, characterized in that the following condition is satisfied: 0.55<TLt / ft<0.85, where TLt is the total optical length at the telephoto end.

10. A zoom lens according to any one of claims 1 to 9, characterized in that, at the wide-angle end, the following condition is satisfied: -1.70<fMRw / ft<-0.80, where fMRw is the composite focal length of all lens groups arranged on the image side of the intermediate group LM.

11. A zoom lens according to any one of claims 1 to 10, characterized in that, at the wide-angle end, the following condition is satisfied: -1.40<fMRw / fMw<-0.50, where fMRw is the composite focal length of all lens groups arranged closer to the image than the intermediate group LM, and fMw is the focal length of the intermediate group LM at the wide-angle end.

12. A zoom lens according to any one of claims 1 to 11, characterized in that the following condition is satisfied: -8.00<f1 / f2<-6.00, where f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

13. A zoom lens according to any one of claims 1 to 12, characterized in that the following condition is satisfied: -2.50<fMw / f2<-1.00, where fMw is the focal length of the intermediate lens unit LM at the wide-angle end, and f2 is the focal length of the second lens unit.

14. A zoom lens according to any one of claims 1 to 13, characterized in that the following condition is satisfied: -2.10<fN-1 / fMw<-1.00, where fMw is the focal length of the intermediate unit LM at the wide-angle end, and fN-1 is the focal length of the lens unit LN-1.

15. A zoom lens according to any one of claims 1 to 14, characterized in that the following condition is satisfied: -12.00<fN / fMw<-2.00, where fMw is the focal length of the intermediate unit LM at the wide-angle end, and fN is the focal length of the lens unit LN.

16. A zoom lens according to any one of claims 1 to 15, characterized in that the following condition is satisfied: 0.08<fN-1 / fN<0.70, where fN-1 is the focal length of the lens unit LN-1 and fN is the focal length of the lens unit LN.

17. A zoom lens according to any one of claims 1 to 16, characterized in that the following condition is satisfied: 0.030<f2 / fN<0.250, where f2 is the focal length of the second lens group and fN is the focal length of the lens group LN.

18. A zoom lens according to any one of claims 1 to 17, characterized in that the following condition is satisfied: 1.00<βN-1t / βN-1w<2.00, where βN-1t is the lateral magnification of the lens unit LN-1 at the telephoto end and βN-1w is the lateral magnification of the lens unit LN-1 at the wide-angle end.

19. A zoom lens according to any one of claims 1 to 18, characterized in that the following condition is satisfied: 0.80<βNt / βNw<1.60, where βNt is the lateral magnification of the lens unit LN at the telephoto end and βNw is the lateral magnification of the lens unit LN at the wide-angle end.

20. A zoom lens according to any one of claims 1 to 19, characterized in that the zoom lens has an image stabilizing lens group IS that moves during image blur correction so as to include a component in a direction perpendicular to the optical axis, and satisfies the condition: 0.45<fMw / fIS<1.00, where fIS is the focal length of the image stabilizing lens group IS and fMw is the focal length of the intermediate lens group LM at the wide-angle end.

21. A zoom lens comprising, arranged in order from the object side to the image side, a first lens group having positive refractive power, a second lens group having negative refractive power, an intermediate group LM having one or more lens groups and having positive refractive power overall, a lens group LN-1, and a lens group LN, wherein the spacing between adjacent lens groups changes during zooming, wherein the second lens group has a positive lens, and wherein the zoom lens satisfies the condition: 10.0<ft / fw<20.0, where fw is the focal length of the entire system at the wide-angle end and ft is the focal length of the entire system at the telephoto end.

22. The zoom lens according to claim 21, wherein the following condition is satisfied: 70.0<vd1p<95.0, where vd1p is the average Abbe number of the positive lenses constituting the first lens group.

23. A zoom lens according to claim 21 or 22, characterized in that the following condition is satisfied: -1.50<fN / ft<-0.10, where fN is the focal length of said lens unit LN.

24. A zoom lens according to any one of claims 21 to 23, characterized in that the following condition is satisfied: 0.30<skw / fw<0.70, where skw is the back focus at the wide-angle end.

25. A zoom lens according to any one of claims 21 to 24, characterized in that the following condition is satisfied: -0.30<fN-1 / ft<-0.05, where fN-1 is the focal length of the lens unit LN-1.

26. A zoom lens according to any one of claims 21 to 25, characterized in that the zoom lens has an image stabilizing lens group IS that moves during image blur correction so as to include a component in a direction perpendicular to the optical axis, and where fIS is the focal length of the image stabilizing lens group IS, the zoom lens satisfies the condition: 0.10<fIS / ft<0.

20.

27. A zoom lens according to any one of claims 21 to 26, characterized in that the following condition is satisfied: 3.00<m1 / fw<4.50, where m1 is the amount of movement of the first lens group from the wide-angle end to the telephoto end.

28. A zoom lens according to any one of claims 21 to 27, characterized in that the following condition is satisfied: 0.060<fMw / ft<0.130, where fMw is the focal length of the intermediate unit LM at the wide-angle end.

29. A zoom lens according to any one of claims 21 to 28, characterized in that the following condition is satisfied: 0.55<TLt / ft<0.85, where TLt is the total optical length at the telephoto end.

30. A zoom lens according to any one of claims 21 to 29, characterized in that, at the wide-angle end, the following condition is satisfied: -1.70<fMRw / ft<-0.80, where fMRw is the composite focal length of all lens groups arranged on the image side of the intermediate group LM.

31. A zoom lens according to any one of claims 21 to 30, characterized in that, when the composite focal length of all lens units arranged closer to the image side than the intermediate unit LM at the wide-angle end is fMRw and the focal length of the intermediate unit LM at the wide-angle end is fMw, the following condition is satisfied: -1.40<fMRw / fMw<-0.

50.

32. A zoom lens according to any one of claims 21 to 31, characterized in that the following condition is satisfied: -8.00<f1 / f2<-6.00, where f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

33. A zoom lens according to any one of claims 21 to 32, characterized in that the following condition is satisfied: -2.50<fMw / f2<-1.00, where fMw is the focal length of the intermediate lens unit LM at the wide-angle end, and f2 is the focal length of the second lens unit.

34. A zoom lens according to any one of claims 21 to 33, characterized in that the following condition is satisfied: -2.10<fN-1 / fMw<-1.00, where fMw is the focal length of the intermediate unit LM at the wide-angle end, and fN-1 is the focal length of the lens unit LN-1.

35. A zoom lens according to any one of claims 21 to 34, characterized in that the following condition is satisfied: -12.00<fN / fMw<-2.00, where fMw is the focal length of the intermediate lens unit LM at the wide-angle end, and fN is the focal length of the lens unit LN.

36. A zoom lens according to any one of claims 21 to 35, characterized in that the following condition is satisfied: 0.08<fN-1 / fN<0.70, where fN-1 is the focal length of the lens unit LN-1 and fN is the focal length of the lens unit LN.

37. A zoom lens according to any one of claims 21 to 36, characterized in that the following condition is satisfied: 0.030<f2 / fN<0.250, where f2 is the focal length of the second lens group and fN is the focal length of the lens group LN.

38. A zoom lens according to any one of claims 21 to 37, characterized in that the following condition is satisfied: 1.00<βN-1t / βN-1w<2.00, where βN-1t is the lateral magnification of the lens unit LN-1 at the telephoto end and βN-1w is the lateral magnification of the lens unit LN-1 at the wide-angle end.

39. A zoom lens according to any one of claims 21 to 38, characterized in that the following condition is satisfied: 0.80<βNt / βNw<1.60, where βNt is the lateral magnification of the lens unit LN at the telephoto end and βNw is the lateral magnification of the lens unit LN at the wide-angle end.

40. A zoom lens according to any one of claims 21 to 39, characterized in that the zoom lens has an image stabilizing lens group IS that moves during image blur correction so as to include a component in a direction perpendicular to the optical axis, and satisfies the condition: 0.45<fMw / fIS<1.00, where fIS is the focal length of the image stabilizing lens group IS and fMw is the focal length of the intermediate lens group LM at the wide-angle end.

41. An imaging device comprising the zoom lens according to any one of claims 21 to 40 and an imaging element.

Images