Zoom lens and imaging device having the same

Abstract

To provide a zoom lens having high imaging performance and realizing a high zoom ratio, and also being compact, and an imaging device having the same. [Solution] A zoom lens including, 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, in which the spacing between adjacent lens groups changes during zooming, and which satisfies a predetermined conditional formula.

Description

[Technical field]

[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. [Background technology]

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

[0003] In recent years, imaging devices such as cameras using solid-state imaging elements or silver halide films have become more sophisticated and the entire device has become smaller. Also, the size of the imaging elements used in the imaging devices has become smaller so that high-resolution images can be obtained. Correspondingly, the photographing optical system used in the imaging devices is required to have resolution up to high spatial frequencies, which is one of the spatial frequencies used to evaluate resolution.

[0004] Furthermore, in a small-sized image pickup device system, since the image pickup device itself is small, there is a demand for a small overall optical length even in the case of a zoom lens with a large zoom ratio.

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

[0006] For example, a positive-negative-positive-negative-positive five-group zoom lens system is proposed in Patent Document 1. This type of zoom lens system achieves both high imaging performance and compact size over the entire zoom range by increasing the number of lens groups that move during zooming and increasing the degree of freedom in aberration correction. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2009-175324 A Summary of the Invention [Problem to be solved by the invention]

[0008] Meanwhile, there is a demand for zoom lenses that have high imaging performance as well as 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 that is 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 PRESENT EMBODIMENTS An object of the present invention is to provide a zoom lens that has high imaging performance and realizes a high zoom ratio, and is also compact, and an image pickup apparatus having the same. [Means for solving the problem]

[0010] A zoom lens according to one aspect of the present invention includes, 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 as a whole, a lens group LN-1 having negative refractive power, a lens group LN having negative refractive power, and a second lens group having negative refractive power. It consists of A zoom lens in which the spacing between adjacent lens groups changes during zooming, the zoom lens has an image stabilization group IS that moves during image blur correction so as to include a component in a direction perpendicular to an optical axis; The focal length of the entire system at the wide-angle end is fw, the focal length of the entire system at the telephoto end is ft, the focal length of the first lens group is f1, and the focal length of the second lens group is f2. The focal length of the image stabilization group IS is fIS, and the total optical length at the telephoto end is TLt When 4.75 <f1 / fw<10.00 -0.0 56≦ f2 / ft<-0.040 10.0 <ft / fw<20.0 0.10 <fIS / ft<0.20 0.55 <TLt / ft<0.85 The present invention is characterized in that the following conditional expression is satisfied:

[0012] Other objects and features of the present invention are illustrated in the following examples. Effect of the Invention

[0013] According to the present invention, it is possible to provide a zoom lens that has high imaging performance and realizes a high zoom ratio, and is compact, and an image pickup apparatus having the same. [Brief description of the drawings]

[0014] [Figure 1] 1 is a lens cross-sectional view of a zoom lens of a first embodiment at a wide-angle end. [Diagram 2] 4A to 4C are longitudinal aberration diagrams at the wide-angle end of the zoom lens of Example 1. [Diagram 3] 4A to 4C are longitudinal aberration diagrams at the telephoto end of the zoom lens of Example 1. [Figure 4] FIG. 11 is a lens cross-sectional view of a zoom lens of a second embodiment at a wide-angle end. [Diagram 5] 11A to 11C are longitudinal aberration diagrams at the wide-angle end of the zoom lens of Example 2. [Figure 6] 11A to 11C are longitudinal aberration diagrams at the telephoto end of the zoom lens of Example 2. [Figure 7] FIG. 11 is a lens cross-sectional view of a zoom lens of a third embodiment at a wide-angle end. [Figure 8] 11A to 11C are longitudinal aberration diagrams at the wide-angle end of the zoom lens of Example 3. [Figure 9] 11A to 11C are longitudinal aberration diagrams of the zoom lens of Example 3 at the telephoto end. [Figure 10] FIG. 11 is a lens cross-sectional view of a zoom lens of Example 4 at the wide-angle end. [Figure 11] 13A to 13C are longitudinal aberration diagrams at the wide-angle end of the zoom lens of Example 4. [Figure 12] 13A to 13C are longitudinal aberration diagrams of the zoom lens of Example 4 at the telephoto end. [Figure 13] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 5 at the wide-angle end. [Figure 14] 13A to 13C are longitudinal aberration diagrams of the zoom lens of Example 5 at the wide-angle end. [Figure 15] 13A to 13C are longitudinal aberration diagrams of the zoom lens of Example 5 at the telephoto end. [Figure 16] FIG. 13 is a lens cross-sectional view of a zoom lens of Example 6 at the wide-angle end. [Figure 17] 13A to 13C are longitudinal aberration diagrams of the zoom lens of Example 6 at the wide-angle end. [Figure 18] 13A to 13C are longitudinal aberration diagrams of the zoom lens of Example 6 at the telephoto end. [Figure 19] 1 is a schematic diagram of an imaging device according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] 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.

[0016] FIG. 1 is a lens cross-sectional view of a zoom lens according to a first embodiment of the present invention at a wide-angle end (short focal length end) when focused on an object at infinity.

[0017] FIG. 2 is a longitudinal aberration diagram when the zoom lens of the first embodiment is focused on an object at infinity at the wide-angle end.

[0018] FIG. 3 is a longitudinal aberration diagram when the zoom lens of the first embodiment is focused on an object at infinity at the telephoto end (long focal length end).

[0019] FIG. 4 is a lens 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.

[0020] FIG. 5 is a longitudinal aberration diagram when the zoom lens of the second embodiment is focused on an object at infinity at the wide-angle end.

[0021] FIG. 6 is a longitudinal aberration diagram when the zoom lens of the second embodiment is focused on an object at infinity at the telephoto end.

[0022] FIG. 7 is a lens 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.

[0023] FIG. 8 is a longitudinal aberration diagram when the zoom lens of the third embodiment is focused on an object at infinity at the wide-angle end.

[0024] 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.

[0025] FIG. 10 is a lens 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.

[0026] 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.

[0027] 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.

[0028] FIG. 13 is a lens 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.

[0029] FIG. 14 is a longitudinal aberration diagram of the zoom lens of Example 5 when focused on an object at infinity at the wide-angle end.

[0030] 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.

[0031] FIG. 16 is a lens sectional view of a zoom lens according to a sixth embodiment of the present invention at the wide-angle end when focused on an object at infinity.

[0032] FIG. 17 is a longitudinal aberration diagram of the zoom lens of Example 6 when focused on an object at infinity at the wide-angle end.

[0033] 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.

[0034] FIG. 19 is a schematic diagram of an imaging device.

[0035] The zoom lens of each embodiment is a photographing lens system used in image pickup devices such as video cameras, digital cameras, and silver halide film cameras.

[0036] 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, and when used as the shooting optical system of a video camera or digital still camera, it is placed on the imaging surface of a solid-state image sensor (photoelectric conversion element) such as a CCD sensor or CMOS sensor, and in the case of a silver halide film camera, it is placed on the photosensitive surface equivalent to the film surface.

[0037] In the aberration diagram, 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.

[0038] ω is the half angle of view, and Fno is the F-number.

[0039] In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when each lens group is located at both ends of the range in which it can mechanically move on the optical axis.

[0040] The arrows indicate the movement locus of each lens group during zooming from the wide-angle end to the telephoto end.

[0041] In Examples 1 and 5 in Figs. 1 and 13, focusing is performed by moving the fourth lens group L4 in the optical axis direction. In Example 2 in Fig. 4, focusing is performed by moving the fourth lens group L4 and the fifth lens group L5 in the optical axis direction. In Examples 3 and 4 in Figs. 1 and 13, focusing is performed by moving the sixth lens group L6 in the optical axis direction. In Example 6 in Fig. 16, focusing is performed by moving the fifth lens group L5 in the optical axis direction.

[0042] Incidentally, focusing may be performed by moving the entire zoom lens or any one of the lens groups.

[0043] In the first to sixth embodiments, the vibration reduction lens group IS moves so as to have a component in a direction approximately perpendicular to the optical axis, and displaces the image in a direction approximately perpendicular to the optical axis to correct image blurring that occurs when the entire zoom lens vibrates.

[0044] Next, features of each embodiment other than those described above will be described.

[0045] In a positive-lead type zoom lens, it is important to obtain good optical performance over the entire object distance while achieving a high zoom ratio and compactness of the entire lens system. To achieve this, 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.

[0046] Unless these configurations are appropriately set, it becomes very difficult to obtain a zoom lens that has high optical performance over the entire zoom range while ensuring a high zoom ratio.

[0047] In order to solve the above problem, the present invention provides a zoom lens having, in order from the object side to the image side, a first lens group L1 having positive refractive power and a second lens group L2 having negative refractive power. The zoom lens further has an intermediate group LM having positive refractive power overall, a lens group LN-1 having negative refractive power, and a lens group LN having negative refractive power, which are arranged on the image side of the second lens group L2. Here, the spacing between adjacent lens groups changes during zooming, and the following conditions are set.

[0048] In each embodiment of the present invention, when the focal length of the entire system at the wide-angle end is fw and the focal length of the first lens unit L1 is f1, 4.75 <f1 / fw<10.00···(1) The present invention is characterized in that the following conditional expressions are satisfied:

[0049] Conditional formula (1) defines the focal length of the first lens group L1. By satisfying conditional formula (1), it becomes easy to realize a telephoto type power arrangement at the telephoto end, and it is possible to shorten the total optical length at the telephoto end, and to obtain high optical performance over the entire image plane with little fluctuation of various aberrations over the entire zoom range. If the refractive power of the first lens group L1 becomes too small by exceeding the upper limit of conditional formula (1), the movement amount of the first lens group L1 must be increased for zooming, which is not good because the total lens length at the telephoto end becomes long. In addition, it becomes difficult to reduce the diameter of the front lens. If the refractive power of the first lens group L1 becomes too large by exceeding the lower limit of conditional formula (1), it is advantageous for achieving a high zoom ratio, but it becomes difficult to correct spherical aberration at the telephoto end.

[0050] If 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, then -0.080 <f2 / ft<-0.040···(2) The present invention is characterized in that the following conditional expressions are satisfied:

[0051] Conditional formula (2) specifies the focal length of the second lens group L2. By satisfying conditional formula (2), it becomes easy to realize a retrofocus type power arrangement at the wide-angle end, and it is possible to achieve both a wider angle of view at the wide-angle end and high optical performance over the entire screen with less fluctuation in various aberrations over the entire zoom range. If the refractive power of the second lens group L2 becomes large beyond the upper limit of conditional formula (2), the refractive power of the second lens group L2 becomes too strong, making it difficult to reduce the fluctuation in spherical aberration and lateral chromatic aberration caused by zooming. In addition, the divergence effect of the axial light beam by the second lens group becomes too large, making it difficult to reduce the size of the subsequent group. If the refractive power of the second lens group L2 becomes small beyond the lower limit of conditional formula (2), it becomes difficult to realize a retrofocus type power arrangement at the wide-angle end, making it difficult to widen the angle of view at the wide-angle end.

[0052] If the focal length of the entire system at the wide-angle end is fw and the focal length of the entire system at the telephoto end is ft, 10.0 <ft / fw<20.0···(3) It is characterized by satisfying the following conditional expressions: By making sure that the corresponding value of conditional expression (3) is not below the lower limit, it is possible to provide an optical system with a higher zoom ratio. By making sure 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 miniaturization.

[0053] It is also preferable that the second lens group L2 has a positive lens, which makes it possible to effectively correct chromatic aberration of magnification at the wide-angle end that occurs due to a negative lens having negative refractive power that is disposed in the second lens group.

[0054] In the optical system of each embodiment, it is preferable to satisfy one or more of the following conditional expressions, in order to obtain the effects corresponding to each conditional expression.

[0055] When the average Abbe number of the positive lenses constituting the first lens unit L1 is vd1p, 70.0 <vd1p<95.0···(4) It is preferable to satisfy the following condition.

[0056] Condition (4) defines the Abbe number of the positive lens in the first lens unit L1.

[0057] By satisfying conditional expression (4), axial chromatic aberration and lateral chromatic aberration at the telephoto end can be effectively corrected.

[0058] When the focal length of the lens group LN is fN, -1.50 <fN / ft<-0.10···(5) It is preferable to satisfy the following condition.

[0059] Conditional formula (5) defines the focal length of the lens group LN. If the refractive power of the lens group LN becomes too strong, exceeding the upper limit of conditional formula (5), it becomes difficult to correct the curvature of field at the wide-angle end. In addition, the exit pupil becomes too short at the wide-angle end, and the incident light beam on the solid-state image sensor becomes obliquely incident, making shading more noticeable. If the refractive power of the lens group LN becomes too weak, exceeding the lower limit of conditional formula (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.

[0060] When the back focus at the wide-angle end is skw, 0.30 <skw / fw<0.70···(6) It is desirable to satisfy the following conditional expression. Conditional expression (6) specifies the ratio of the focal length of the entire system to the back focus at the wide-angle end. By satisfying conditional expression (6), it is possible to obtain good optical performance while making the optical system compact.

[0061] If the focal length of the lens group LN-1 is fN-1, then -0.30 <fN-1 / ft<-0.05···(7) It is preferable to satisfy the following conditional expression. Conditional expression (7) is for appropriately setting the focal length of the lens group LN-1. By satisfying conditional expression (7), it is possible to achieve both compactness and good optical performance when the lens group LF is used as a focus lens group. If the upper limit of conditional expression (7) is exceeded, the refractive power of the lens group LN-1 becomes too strong, making it difficult to correct lateral chromatic aberration and curvature of field. If the lower limit is exceeded, the refractive power of the lens group LN-1 becomes too weak, increasing the amount of movement during focusing and resulting in large aberration fluctuations during focusing on close objects.

[0062] If the focal length of the image stabilizing lens group IS is fIS, 0.10 <fIS / ft<0.20 ···(8) It is preferable to satisfy the following condition.

[0063] Conditional formula (8) specifies the focal length of the image stabilization lens group IS. If the upper limit of conditional formula (8) is exceeded and the refractive power of the image stabilization lens group IS becomes too weak, the amount of movement during image stabilization becomes large, making it difficult to reduce the outer diameter of the lens. If the lower limit is exceeded and the refractive power of the image stabilization lens group IS becomes too strong, decentering coma aberration and asymmetric curvature of field occur, making it difficult to obtain good image stabilization performance.

[0064] When the amount of movement of the first lens unit L1 from the wide-angle end to the telephoto end is m1, 3.00 <m1 / fw<4.50···(9) It is preferable to satisfy the following conditional expression. Conditional expression (9) specifies the amount of movement of the first lens group L1 from the wide-angle end to the telephoto end. If the amount of movement of the first lens group L1 becomes too large, exceeding the upper limit of conditional expression (9), 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 amount of movement of the first lens group L1 becomes too small, exceeding the upper limit, in order to ensure the zoom ratio, the refractive power of the first lens group L1 becomes too strong, and it becomes difficult to correct spherical aberration and chromatic aberration at the telephoto end.

[0065] If the focal length of the intermediate group LM at the wide-angle end is fMw, then 0.060 <fMw / ft<0.130···(10) It is preferable to satisfy the following conditional expressions. Conditional expression (10) specifies the focal length of the intermediate group LM. If the upper limit of conditional expression (10) is exceeded and the refractive power of the intermediate group LM becomes too weak, it becomes difficult to obtain a magnification ratio exceeding 10. If the lower limit is exceeded and the refractive power of the intermediate group LM becomes too strong, it becomes difficult to suppress zoom fluctuations in spherical aberration and to correct spherical aberration at the wide-angle end.

[0066] When the total optical length at the telephoto end is TLt, 0.55 <TLt / ft<0.85···(11) It is preferable to satisfy the following conditional expression. Conditional expression (11) specifies the ratio of the total optical length at the telephoto end to the focal length of the entire system at the telephoto end. By satisfying conditional expression (11), it is possible to achieve a compact optical system while also obtaining good optical performance.

[0067] If the composite focal length of the lens group closer to the image side than the intermediate group LM at the wide-angle end is fMRw, -1.70 <fMRw / f w <-0.80···(12) It is preferable to satisfy the following conditional expression. Conditional expression (12) specifies the composite focal length of the lens groups (lens group LN-1 and lens group LN) that are closer to the image side than the intermediate group LM at the wide-angle end. If the upper limit of conditional expression (12) is exceeded and the refractive power of the subsequent groups becomes too strong, it becomes difficult to correct the 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, and shading becomes noticeable. If the lower limit is exceeded and the refractive power of the subsequent groups becomes too weak, it becomes difficult to shorten the overall optical length.

[0068] Let fMRw be the composite focal length of the lens group closer to the image side than the intermediate group LM at the wide-angle end, and fMw be the focal length of the intermediate group LM at the wide-angle end. -1.40 <fMRw / fMw<-0.50···(13) It is desirable to satisfy the following condition. Condition (13) prescribes the ratio of the focal lengths of the intermediate group LM and the subsequent group. If the upper limit of condition (13) is exceeded, the refractive power of the subsequent group becomes too strong, making it difficult to correct curvature of field. If the lower limit is exceeded, the refractive power of the intermediate group becomes too strong, making it difficult to correct spherical aberration.

[0069] If the focal length of the first lens group is f1 and the focal length of the second lens group is f2, -8.00 <f1 / f2<-6.00 ···(14) It is preferable to satisfy the following condition.

[0070] 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.

[0071] Let fMw be the focal length of the intermediate lens unit LM at the wide-angle end, and f2 be the focal length of the second lens unit L2. -2.50 <fMw / f2<-1.00 ···(15) It is preferable to satisfy the following conditional expression. Conditional expression (15) prescribes the ratio of the focal lengths of the intermediate group LM and the second lens group L2. If the upper limit of conditional expression (15) is exceeded and the refractive power of the intermediate group 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 group L2 becomes too strong, it becomes difficult to correct fluctuations in field curvature during zooming.

[0072] Let the focal length of the intermediate lens group LM at the wide-angle end be fMw and the focal length of the lens group LN-1 be fN-1. -2.10 <fN-1 / fMw<-1.00 ···(16) It is preferable to satisfy the following conditional expression. Conditional expression (16) specifies the ratio of the focal lengths of the intermediate group LM and the lens group LN-1. If the upper limit of conditional expression (16) is exceeded and the refractive power of the lens group 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 group LM becomes too strong, it becomes difficult to correct spherical aberration at the wide-angle end.

[0073] Let the focal length of the intermediate lens group LM at the wide-angle end be fMw and the focal length of the lens group LN be fN. -12.00 <fN / fMw<-2.00···(17) It is desirable to satisfy the following conditional expression. Conditional expression (17) prescribes the ratio of the focal lengths of the intermediate group LM and the lens group LN. If the upper limit of conditional expression (17) is exceeded and the refractive power of the lens group 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 group LM becomes too strong, it becomes difficult to correct spherical aberration at the wide-angle end.

[0074] Let the focal length of lens group LN-1 be fN-1 and the focal length of lens group LN be fN. 0.08 <fN-1 / fN<0.70···(18) It is preferable to satisfy the following conditional expression. Conditional expression (18) specifies the ratio of the focal lengths of the lens group LN-1 and the lens group LN. If the upper limit of conditional expression (18) is exceeded and the refractive power of the lens group LN-1 becomes too weak, when the lens group LN-1 is used as a focus lens group, the amount of movement during focusing becomes large, and the aberration fluctuation during focusing on a close distance becomes large. If the lower limit is exceeded and the refractive power of the lens group LN-1 becomes too strong, it becomes difficult to correct the chromatic aberration of magnification and the focus fluctuation of field curvature.

[0075] If the focal length of the second lens group L2 is f2 and the focal length of the lens group LN is fN, then 0.030 <f2 / fN<0.250···(19) It is preferable to satisfy the following conditional expression. Conditional expression (19) prescribes 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.

[0076] If the lateral magnification of the lens group LN-1 at the telephoto end is βN-1t and the lateral magnification of the lens group LN-1 at the wide-angle end is βN-1w, then 1.00<βN-1t / βN-1w<2.00...(20) It is preferable to satisfy the following condition: Condition (20) defines the magnification sharing of the lens unit LN-1. By satisfying condition (20), it is possible to obtain good optical performance while making the optical system compact.

[0077] When the lateral magnification of the lens group LN at the telephoto end is βNt and the lateral magnification of the lens group LN at the wide-angle end is βNw, 0.80<βNt / βNw<1.60 (21) It is preferable to satisfy the following condition: Condition (21) defines the magnification sharing of the lens unit LN. By satisfying condition (21), it is possible to obtain good optical performance while making the optical system compact.

[0078] Let fMw be the focal length of the intermediate lens group LM at the wide-angle end, and fIS be the focal length of the vibration-proof lens group IS. 0.45 <fMw / fIS<1.00···(22) It is preferable to satisfy the following condition. Condition (22) specifies the focal length of the image stabilization lens group IS. If the upper limit of condition (22) is exceeded and the refractive power of the image stabilization lens group becomes too strong, decentering coma aberration and asymmetric curvature of field occur, making it difficult to obtain good image stabilization performance. If the lower limit is exceeded and the refractive power of the image stabilization lens group becomes too weak, the amount of movement during image stabilization becomes large, making it difficult to reduce the outer diameter of the lens.

[0079] In each embodiment, it is preferable to set the numerical ranges of the above-mentioned conditional expressions (1) to (22) as follows:

[0080] 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 / f w <-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:

[0081] 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 / f w <-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 and realizing a high zoom ratio, as well as a small-sized zoom lens, and an image pickup apparatus having the same.

[0082] In the zoom lens of each embodiment, it is preferable to deposit a fluorine coating on at least one of the object side surface of the lens located closest to the object and the image side surface of the lens located closest to the image. Since the object side surface of the lens located closest to the object and the image side surface of the lens located closest to the image are likely to come into contact with the outside world, by depositing a fluorine coating, it is possible to improve water repellency and oil repellency, suppress flare, and obtain high optical performance. In particular, since the object side surface of the lens located closest to the object has a large diameter, it is preferable to deposit a fluorine coating.

[0083] The positive lens and the negative lens constituting the cemented lens arranged in the zoom lens of each embodiment are preferably bonded with an adhesive having a thickness on the optical axis of 0.005 mm or more and 0.05 mm or less. If it is less than 0.005 mm, it is easy to peel off, and if it is more than 0.03 mm, the distance on the optical axis from the surface of the cemented lens closest to the object side to the surface on the image side becomes long, so the total lens length becomes long. More preferably, it is preferable to satisfy 0.008 mm or more and 0.02 mm or less.

[0084] At least one lens arranged in the zoom lens of each embodiment is provided with an anti-reflection film for preventing reflection, and the anti-reflection film is composed of a plurality of films. Here, when the refractive index of the film closest to the air interface side is Nd with respect to the d-line, it is preferable that the anti-reflection film PC has Nd of 1.32 or less. By making Nd 1.32 or less, the difference in refractive index with air can be reduced, so that it is possible to further reduce the reflection of light, and ghosting can be reduced. Specific examples of the configuration of the anti-reflection film PC include, but are not limited to, multilayer films using a wet method described in JP2012-230211A and JP2014-95877A. More preferably, by making Nd 1.30 or less, ghosting can be further reduced.

[0085] Here, it is preferable to provide an anti-reflection coating PC on the image side of the negative lens with a concave surface facing the image side among the negative lenses arranged in the zoom lens. Light reflected by a negative lens with a concave surface facing the image side is likely to be reflected at a large angle with respect to the normal direction of the surface of the negative lens with a concave surface facing the image side, and therefore the reflectance is likely to be high.

[0086] In addition, light reflected by a negative lens with a concave surface facing the image side tends to be focused on the image plane, making ghosting noticeable. Therefore, ghosting can be reduced by applying an anti-reflection coating PC to the image-side surface of a negative lens with a concave surface facing the image side.

[0087] 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.

[0088] 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 i-th surface (i-th surface), di indicates the distance between the i-th surface and the (i+1)-th surface, ndi and νdi indicate the refractive index and Abbe number based on the d-line, respectively. f indicates the focal length, and Fno indicates the F-number.

[0089] If the optical surface is aspheric, a * symbol is added to the right of the surface number. The aspheric shape is expressed as follows, where X is the displacement from the apex of the surface in the optical axis direction, h is the height from the optical axis in a direction perpendicular to the optical axis, R is the paraxial radius of curvature, k is the conic constant, and A4, A6, A8, A10, and A12 are the aspheric coefficients of each order: x=(h 2 / R) / [1+{1-(1+k)(h / R) 2} 1 / 2 ]+A4×h 4 +A6×h 6 +A8×h 8 +A10×h 10 +A12×h 12 In addition, "e±XX" in each aspheric coefficient is "×10± XX " It means.

[0090] The lens arrangement length represents the distance on the optical axis from the surface closest to the object side to the surface closest to the image side in each lens group.

[0091] Table 1 shows the relationship between the above-mentioned conditional expressions and various numerical values ​​in the numerical examples. [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 having positive refractive power (middle group LM), L4 is a fourth lens group having negative refractive power (lens group LN-1), and L5 is a fifth lens group having negative refractive power (lens group LN).

[0092] The first lens group L1 is composed of, 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, and a positive meniscus lens with a convex surface facing the object side.

[0093] The second lens group L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspheric surface formed on the object side surface, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0094] The third lens group 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.

[0095] Further, on the image side of the cemented negative lens, there is a cemented positive lens formed by cementing a negative meniscus lens with a convex surface facing the object side to a biconvex positive lens, and a cemented negative lens formed by cementing a biconcave negative lens to a biconvex positive lens with an aspheric surface formed on the image side.Further, on the image side of the cemented negative lens, there is a cemented positive lens formed by cementing a negative meniscus lens with a convex surface facing the object side to a biconvex positive lens.

[0096] The fourth lens group 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.

[0097] The fifth lens group L5 is composed of, in order from the object side, a biconvex positive lens, and a negative lens that has a negative meniscus shape with its concave surface facing the object side and has an aspheric surface formed on its object side.

[0098] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0099] During zooming from the wide-angle end to the telephoto end, the first lens group L1 moves toward the object side as shown by the arrow. The second lens group L2 moves toward the object side while increasing the distance between it and the first lens group L1. The third lens group L3 moves toward the object side while decreasing the distance between it and the second lens group L2. The fourth lens group L4 moves toward the object side while increasing the distance between it and the third lens group L3. The fifth lens group L5 moves toward the object side while increasing the distance between it and the fourth lens group L4.

[0100] The aperture stop SP moves together with the third lens unit L3.

[0101] The vibration-reduction lens group IS is a cemented positive lens consisting of a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens cemented together, and 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 to correct image blurring that occurs when the entire zoom lens vibrates.

[0102] Focusing is performed by moving the fourth lens unit L4 toward the image side. [Numerical Example 1] Numerical example 1 corresponding to the first embodiment is as follows. Unit: mm Surface Data Surface number rd nd νd Effective 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 plane ∞ Aspheric Data Side 6 K = 0.00000e+00 A 4= 3.83583e-06 A 6=-4.89664e-10 A 8= 2.81674e-11 A10=-1.08555e-13 A12= 2.38728e-16 Page 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 Page 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 Mid-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 Lens total 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 starting plane 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 starting 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 Fig. 4, 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, L4 is a fourth lens group with positive refractive power, L5 is a fifth lens group with negative refractive power (lens group LN-1), and L6 is a sixth lens group with negative refractive power (lens group LN).

[0103] The third and fourth lens groups are the intermediate group LM.

[0104] The first lens group L1 is composed of, 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, and a positive meniscus lens with a convex surface facing the object side.

[0105] The second lens group L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspheric surface formed on the object side surface, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0106] The third lens group L3 has, 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.Furthermore, on the image side of the cemented positive lens, a cemented negative lens is formed by cementing a biconcave negative lens and a biconvex positive lens with an aspheric surface formed on the image side.The fourth lens group L4 has, 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.

[0107] The fifth lens group L5 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.

[0108] The sixth lens group L6 is composed of, in order from the object side, a biconvex positive lens, and a negative lens having a negative meniscus shape with its concave surface facing the object side and an aspheric surface formed on the object side.

[0109] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0110] During zooming from the wide-angle end to the telephoto end, the first lens group L1 moves toward the object side as shown by the arrow. The second lens group L2 moves toward the object side while increasing the distance between it and the first lens group L1. The third lens group L3 moves toward the object side while decreasing the distance between it and the second lens group L2.

[0111] The fourth lens group L4 moves toward the object side while increasing the distance between it and the third lens group L3. The fifth lens group L5 moves toward the object side while increasing the distance between it and the fourth lens group L4. The sixth lens group L6 moves toward the object side while increasing the distance between it and the fifth lens group L5.

[0112] The aperture stop SP moves together with the third lens unit L3.

[0113] The vibration-reduction lens group IS is a cemented positive lens consisting of a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens cemented together, and 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 to correct image blurring that occurs when the entire zoom lens vibrates.

[0114] Focusing is performed by moving the fourth lens group L4 toward the object side and the fifth lens group L5 toward the image side. [Numerical Example 2] Numerical example 2 corresponding to example 2 is as follows.

[0115] Unit: mm Surface Data Surface number rd nd νd Effective 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 plane ∞ Aspheric Data Side 6 K = 0.00000e+00 A 4= 3.77899e-06 A 6=-6.89162e-10 A 8= 1.59375e-11 A10=-5.29178e-14 A12= 9.86025e-17 Page 28 K = 0.00000e+00 A 4= 1.05910e-05 A 6= 2.98231e-09 A 8= 4.98908e-11 A10=-5.77344e-13 A12= 1.82184e-15 Page 37 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-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 Lens total 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 starting plane 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 starting 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] 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, L4 is a fourth lens group with negative refractive power, L5 is a fifth lens group with positive refractive power, L6 is a sixth lens group with negative refractive power (lens group LN-1), and L7 is a seventh lens group with negative refractive power (lens group LN).

[0116] The third lens group to the fifth lens group form the intermediate group LM.

[0117] The first lens group L1 is composed of, 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, and a positive meniscus lens with a convex surface facing the object side.

[0118] The second lens group L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspheric surface formed on the object side surface, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0119] The third lens group 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 with its convex surface facing the object side and a biconvex positive lens.

[0120] The fourth lens group 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 aspheric surface formed on the image side. The fifth lens group L5 is composed of, from the object side, 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.

[0121] The sixth lens group L6 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.

[0122] 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 that has a negative meniscus shape with its concave surface facing the object side and has an aspheric surface formed on its object side surface.

[0123] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0124] During zooming from the wide-angle end to the telephoto end, the first lens group L1 moves toward the object side as shown by the arrow. The second lens group L2 moves toward the object side while increasing the distance between it and the first lens group L1. The third lens group L3 moves toward the object side while decreasing the distance between it and the second lens group L2.

[0125] The fourth lens group L4 moves toward the object side while increasing the distance between it and the third lens group L3. The fifth lens group L5 moves toward the object side while decreasing the distance between it and the fourth lens group L4. The sixth lens group L6 moves toward the object side while increasing the distance between it and the fifth lens group L5. The seventh lens group L7 moves toward the object side while increasing the distance between it and the sixth lens group L6.

[0126] The aperture stop SP moves together with the third lens unit L3.

[0127] The vibration-reduction lens group IS is a cemented positive lens consisting of a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens cemented together, and 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 to correct image blurring that occurs when the entire zoom lens vibrates.

[0128] Focusing is performed by moving the sixth lens unit L6 toward the image side.

[0129] [Numerical Example 3] Numerical example 3 corresponding to example 3 is as follows.

[0130] Unit: mm Surface Data Surface number rd nd νd Effective 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 plane ∞ Aspheric Data Side 6 K = 0.00000e+00 A 4= 4.16182e-06 A 6=-1.01293e-09 A 8= 3.04594e-11 A10=-1.26477e-13 A12= 2.74307e-16 Page 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 Page 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 Mid-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 Lens total 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 starting plane 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 Single lens data Lens starting 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] 10, 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, L4 is a fourth lens group with negative refractive power, L5 is a fifth lens group with positive refractive power, L6 is a sixth lens group with negative refractive power (lens group LN-1), and L7 is a seventh lens group with negative refractive power (lens group LN). The third lens group to the fifth lens group form the intermediate group LM.

[0131] The first lens group L1 is composed of, 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, and a positive meniscus lens with a convex surface facing the object side.

[0132] The second lens group L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspheric surface formed on the object side surface, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0133] The third lens group L3 is composed of, in order from the object side, a biconvex positive lens, a cemented negative lens in which a biconvex positive lens and a biconcave negative lens are cemented together, and a cemented positive lens in which a negative meniscus with a convex surface facing the object side and a biconvex positive lens are cemented together.

[0134] The fourth lens group L4 is composed of a negative meniscus lens with a concave surface facing the object side. The fifth lens group L5 is composed of, in order from the object side, a biconvex positive lens with aspheric surfaces 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.

[0135] The sixth lens group L6 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.

[0136] The seventh lens group L7 is composed of, in order from the object side, a biconvex positive lens, an object, and a negative lens that has a negative meniscus shape with its concave surface facing the object side and has an aspheric surface formed on its object side. SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0137] During zooming from the wide-angle end to the telephoto end, the first lens group L1 moves toward the object side as shown by the arrows. The second lens group L2 moves toward the object side while increasing the distance between it and the first lens group L1. The third lens group L3 moves toward the object side while decreasing the distance between it and the second lens group L2. The fourth lens group L4 moves toward the object side while increasing the distance between it and the third lens group L3.

[0138] The fifth lens group L5 moves toward the object side while decreasing the distance between it and the fourth lens group L4. The sixth lens group L6 moves toward the object side while decreasing the distance between it and the fifth lens group L5. The seventh lens group L7 moves toward the object side while increasing the distance between it and the sixth lens group L6.

[0139] The aperture stop SP moves together with the third lens unit L3.

[0140] The vibration-reduction lens group IS is a cemented positive lens consisting of a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens cemented together, and 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 to correct image blurring that occurs when the entire zoom lens vibrates.

[0141] Focusing is performed by moving the sixth lens unit L6 toward the image side. [Numerical Example 4] Numerical example 4 corresponding to the fourth embodiment is as follows.

[0142] Unit: mm Surface Data Surface number rd nd νd Effective 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 plane ∞ Aspheric Data Side 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 Page 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 Page 27 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 Page 36 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 Mid-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 Lens total 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 starting plane 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 starting 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 having positive refractive power, L2 is a second lens group having negative refractive power, L3 is a third lens group having positive refractive power (middle group LM), L4 is a fourth lens group having negative refractive power (lens group LN-1), and L5 is a fifth lens group having negative refractive power (lens group LN).

[0143] The first lens group L1 is composed of, 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, and a positive meniscus lens with a convex surface facing the object side.

[0144] The second lens group L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspheric surface formed on the object side surface, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0145] The third lens group L3 includes, 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 a convex surface facing the object side and a biconvex positive lens. On the image side of the cemented positive lens, it includes a biconcave negative lens, a biconvex positive lens with aspheric surfaces formed on both sides, and a cemented positive lens formed by cementing a biconcave negative lens and a biconvex positive lens. The fourth lens group L4 includes, from the object side, a cemented negative lens formed by cementing a biconvex positive lens and a biconcave negative lens.

[0146] The fifth lens group L5 is composed of, in order from the object side, a biconvex positive lens, and a negative lens that has a negative meniscus shape with its concave surface facing the object side and has an aspheric surface formed on its object side.

[0147] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0148] During zooming from the wide-angle end to the telephoto end, the first lens group L1 moves toward the object side as shown by the arrow. The second lens group L2 moves toward the object side while increasing the distance between it and the first lens group L1. The third lens group L3 moves toward the object side while decreasing the distance between it and the second lens group L2. The fourth lens group L4 moves toward the object side while increasing the distance between it and the third lens group L3. The fifth lens group L5 moves toward the object side while increasing the distance between it and the fourth lens group L4.

[0149] The aperture stop SP moves together with the third lens unit L3.

[0150] The vibration-reduction lens group IS is a cemented positive lens consisting of a negative meniscus lens with its convex surface facing the object side and a biconvex positive lens cemented together, and 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 to correct image blurring that occurs when the entire zoom lens vibrates.

[0151] Focusing is performed by moving the fourth lens unit L4 toward the image side. [Numerical Example 5] Numerical example 5 corresponding to the fifth embodiment is as follows.

[0152] Unit: mm Surface Data Surface number rd nd νd Effective 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 plane ∞ Aspheric Data Side 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 Page 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 Page 27 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 Page 36 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 Mid-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 Lens total 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 starting plane 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 starting 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 18 19.40 11 19 -12.12 12 21 -58.31 13 22 28.23 14 24 -26.92 15 26 30.55 16 28 -54.39 17 29 30.09 18 31 45.29 19 32 -25.24 20 34 76.17 21 36 -41.97 [Example 6] 16, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, L3 is a third lens group having a positive refractive power, L4 is a fourth lens group having a positive refractive power, L5 is a fifth lens group having a negative refractive power (lens group LN-1), and L6 is a sixth lens group having a negative refractive power (lens group LN). The third and fourth lens groups are the intermediate group LM.

[0153] The first lens group L1 is composed of, 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, and a positive meniscus lens with a convex surface facing the object side.

[0154] The second lens group L2 is composed of, in order from the object side, a negative meniscus lens with a convex surface facing the object side and an aspheric surface formed on the object side surface, a biconcave negative lens, a biconvex positive lens, and a negative meniscus lens with a concave surface facing the object side.

[0155] The third lens group 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 a 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.

[0156] The fourth lens group L4 is composed of, from the object side, a biconvex positive lens with aspheric 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.

[0157] The sixth lens group 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 aspheric surface formed on the object side.

[0158] SP denotes an aperture stop, which is disposed on the object side of the third lens unit L3.

[0159] 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. The second lens unit L2 moves toward the object side while increasing the distance between it and the first lens unit L1.

[0160] The third lens group L3 moves toward the object side while decreasing the distance between it and the second lens group L2. The fourth lens group L4 moves toward the object side while decreasing the distance between it and the third lens group L3. The fifth lens group L5 moves toward the object side while decreasing the distance between it and the fourth lens group L4. The sixth lens group L6 moves toward the object side while increasing the distance between it and the fifth lens group L5.

[0161] The vibration-proof lens group IS is 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-proof 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 to correct image blur caused when the entire zoom lens vibrates. In other words, vibration is prevented.

[0162] Focusing is performed by moving the fifth lens unit L5 toward the image side. [Numerical Example 6] Numerical example 6 corresponding to the sixth embodiment is as follows.

[0163] Unit: mm Surface Data Surface number rd nd νd Effective 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 plane ∞ Aspheric Data Side 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 Page 29 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 Page 30 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 Page 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-Telephoto Focal length 28.85 105.81 388.00 F-number 2.99 5.33 6.49 Half angle of view 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 starting plane 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 starting 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

[0164] [Table 1]

[0165] 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.

[0166] In Fig. 19, 10 is a diagram of an example of an imaging device, 11 is a photographing optical system constituted by the zoom lens of the present invention, and 12 is a solid-state imaging element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor that receives the subject image formed by the photographing optical system 11. Also, 13 is a recording means that records the subject image received by the imaging element 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 imaging element 12.

[0167] In this way, by applying the zoom lens of the present invention to an optical device such as a digital camera, it is possible to realize an optical device having high optical performance.

[0168] The present invention can also be applied to a camera without a quick return mirror.

[0169] The zoom lens of the present invention can also be applied to a video camera.

[0170] The disclosure of each embodiment includes the following configuration. (Configuration 1) A zoom lens including, in order from an object side to an 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 the distance between adjacent lens groups changes during zooming, Let fw be the focal length of the entire system at the wide-angle end, ft be the focal length of the entire system at the telephoto end, f1 be the focal length of the first lens group, and f2 be the focal length of the second lens group. 4.75 <f1 / fw<10.00 -0.080 <f2 / ft<-0.040 10.0 <ft / fw<20.0 A zoom lens characterized by satisfying the following conditional expressions: (Configuration 2) When the average Abbe number of the positive lenses constituting the first lens group is vd1p, 70.0 <vd1p<95.0 2. The zoom lens according to claim 1, wherein the following condition is satisfied: (Configuration 3) When the focal length of the lens group LN is fN, -1.50 <fN / ft<-0.10 3. The zoom lens according to configuration 1 or 2, wherein the following condition is satisfied: (Configuration 4) When the back focus at the wide-angle end is skw, 0.30 <skw / fw<0.70 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 lens group LN-1 is fN-1, -0.30 <fN-1 / ft<-0.05 5. The zoom lens according to any one of configurations 1 to 4, which satisfies the following conditional expression: (Configuration 6) The zoom lens has an anti-vibration lens group IS that moves during image blur correction so as to include a component in a direction perpendicular to the optical axis, and when the focal length of the anti-vibration lens group IS is fIS, 0.10 <fIS / ft<0.20 6. The zoom lens according to any one of configurations 1 to 5, wherein the following condition is satisfied: (Configuration 7) When the amount of movement of the first lens group from the wide-angle end to the telephoto end is m1, 3.00 <m1 / fw<4.50 7. The zoom lens according to claim 1, wherein the following condition is satisfied: (Configuration 8) When the focal length of the intermediate lens unit LM at the wide-angle end is fMw, 0.060 <fMw / ft<0.130 8. The zoom lens according to any one of configurations 1 to 7, wherein the following condition is satisfied: (Configuration 9) When the total optical length at the telephoto end is TLt, 0.55 <TLt / ft<0.85 9. The zoom lens according to any one of configurations 1 to 8, wherein the following condition is satisfied: (Configuration 10) At the wide-angle end, when the composite focal length of all the lens groups disposed on the image side of the intermediate group LM is fMRw, -1.70 <fMRw / f w <-0.80 10. The zoom lens according to any one of configurations 1 to 9, wherein the following condition is satisfied: (Configuration 11) Let fMRw be the composite focal length of all the lens groups disposed on the image side of the intermediate group LM at the wide-angle end, and fMw be the focal length of the intermediate group LM at the wide-angle end. -1.40 <fMRw / fMw<-0.50 11. The zoom lens according to any one of configurations 1 to 10, wherein the following condition is satisfied: (Configuration 12) When the focal length of the first lens group is f1 and the focal length of the second lens group is f2, -8.00 <f1 / f2<-6.00 12. The zoom lens according to any one of configurations 1 to 11, wherein the following condition is satisfied: (Configuration 13) When the focal length of the intermediate lens group LM at the wide-angle end is fMw and the focal length of the second lens group is f2, -2.50 <fMw / f2<-1.00 13. The zoom lens according to any one of configurations 1 to 12, wherein the following condition is satisfied: (Configuration 14) When the focal length of the intermediate lens group LM at the wide-angle end is fMw and the focal length of the lens group LN-1 is fN-1, -2.10 <fN-1 / fMw<-1.00 14. The zoom lens according to any one of configurations 1 to 13, wherein the following condition is satisfied: (Configuration 15) When the focal length of the intermediate lens group LM at the wide-angle end is fMw and the focal length of the lens group LN is fN, -12.00 <fN / fMw<-2.00 15. The zoom lens according to any one of configurations 1 to 14, wherein the following condition is satisfied: (Configuration 16) When the focal length of the lens group LN-1 is fN-1 and the focal length of the lens group LN is fN, 0.08 <fN-1 / fN<0.70 16. The zoom lens according to any one of configurations 1 to 15, wherein the following condition is satisfied: (Configuration 17) When the focal length of the second lens group is f2 and the focal length of the lens group LN is fN, 0.030 <f2 / fN<0.250 17. The zoom lens according to any one of configurations 1 to 16, wherein the following condition is satisfied: (Configuration 18) When the lateral magnification of the lens group LN-1 at the telephoto end is βN-1t and the lateral magnification of the lens group LN-1 at the wide-angle end is βN-1w, 1.00<βN-1t / βN-1w<2.00 18. The zoom lens according to any one of configurations 1 to 17, wherein the following condition is satisfied: (Configuration 19) When the lateral magnification of the lens group LN at the telephoto end is βNt and the lateral magnification of the lens group LN at the wide-angle end is βNw, 0.80<βNt / βNw<1.60 19. The zoom lens according to any one of configurations 1 to 18, wherein the following condition is satisfied: (Configuration 20) The zoom lens has an anti-vibration lens group IS that moves during image blur correction so as to include a component in a direction perpendicular to the optical axis. Let fIS be the focal length of the anti-vibration lens group IS, and fMw be the focal length of the intermediate lens group LM at the wide-angle end. 0.45 <fMw / fIS<1.00 20. The zoom lens according to any one of configurations 1 to 19, wherein the following condition is satisfied: (Configuration 21) A zoom lens including, arranged in order from an object side to an 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, and a lens group LN, wherein the distance between adjacent lens groups changes during zooming, the second lens group has a positive lens, The focal length of the entire system at the wide-angle end is fw, and the focal length of the entire system at the telephoto end is f t and When you do, 10.0 <ft / fw<20.0 A zoom lens characterized by satisfying the following conditional expressions: (Configuration 22) 22. An imaging device comprising the zoom lens of any one of configurations 1 to 21 and an imaging element.

[0171] 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. [Explanation of symbols]

[0172] L1: First lens group L2: Second lens group LM: intermediate group LN-1: Negative lens group on the image side of the intermediate group LM LN: negative lens group on the image side of lens group LN-1

Claims

1. A zoom lens including, arranged in order from an object side to an 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 the distance between adjacent lens groups changes during zooming, the zoom lens has an image stabilization group IS that moves during image blur correction so as to include a component in a direction perpendicular to an optical axis; Let fw be the focal length of the entire system at the wide-angle end, ft be the focal length of the entire system at the telephoto end, f1 be the focal length of the first lens group, f2 be the focal length of the second lens group, fIS be the focal length of the image stabilization group IS, and TLt be the total optical length at the telephoto end. 4.75<f1 / fw<10.00 -0.056≦f2 / ft<-0.040 10.0<ft / fw<20.0 0.10<fIS / ft<0.20 0.55<TLt / ft<0.85 A zoom lens characterized by satisfying the following conditional expressions:

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

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

4. When the back focus at the wide-angle end is skw, 0.30<skw / fw<0.70 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

5. When the focal length of the lens group LN-1 is fN-1, -0.30<fN-1 / ft<-0.05 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

6. When the amount of movement of the first lens group from the wide-angle end to the telephoto end is m1, 3.00<m1 / fw<4.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

7. When the focal length of the intermediate lens unit LM at the wide-angle end is fMw, 0.060<fMw / ft<0.130 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

8. At the wide-angle end, when the composite focal length of all the lens groups disposed on the image side of the intermediate group LM is fMRw, -1.70<fMRw / fw<-0.80 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

9. When the composite focal length of all the lens groups disposed on the image side of the intermediate group LM at the wide-angle end is fMRw and the focal length of the intermediate group LM at the wide-angle end is fMw, -1.40<fMRw / fMw<-0.50 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

10. When the focal length of the first lens group is f1 and the focal length of the second lens group is f2, -8.00<f1 / f2<-6.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

11. When the focal length of the intermediate lens unit LM at the wide-angle end is fMw and the focal length of the second lens unit is f2, -2.50<fMw / f2<-1.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

12. When the focal length of the intermediate lens unit LM at the wide-angle end is fMw and the focal length of the lens unit LN-1 is fN-1, -2.10<fN-1 / fMw<-1.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

13. When the focal length of the intermediate lens unit LM at the wide-angle end is fMw and the focal length of the lens unit LN is fN, -12.00<fN / fMw<-2.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

14. When the focal length of the lens group LN-1 is fN-1 and the focal length of the lens group LN is fN, 0.08<fN-1 / fN<0.70 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

15. When the focal length of the second lens group is f2 and the focal length of the lens group LN is fN, 0.030<f2 / fN<0.250 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

16. When the lateral magnification of the lens group LN-1 at the telephoto end is βN-1t and the lateral magnification of the lens group LN-1 at the wide-angle end is βN-1w, 1.00<βN-1t / βN-1w<2.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

17. 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, 0.80<βNt / βNw<1.60 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

18. When the focal length of the intermediate lens unit LM at the wide-angle end is fMw, 0.45<fMw / fIS<1.00 2. The zoom lens according to claim 1, wherein the following condition is satisfied:

19. An imaging device comprising the zoom lens according to claim 1 and an imaging element.

Images