JP2014021256A - Zoom lens and image capturing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens which easily achieves high-speed anti-shake motion and maintains good optical performance when the anti-shake motion takes place and which has an entirely compact optical system and a high zoom ratio.SOLUTION: A zoom lens comprises a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, a fourth lens group having negative refractive power, a fifth lens group having positive refractive power, and a sixth lens group having negative refractive power in order from an object side to an image side. When zooming, distances between adjacent lens groups are altered. Entire or part of the fourth lens group is moved in a direction having a component orthogonal to the optical axis to move an image forming position in a direction orthogonal to the optical axis. Focal lengths f1, f2 and f3 of the first lens group, the second lens group, and the third lens group and focal lengths fw and ft of the entire system at the wide angle end and at the telephoto end are each set appropriately.

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, and more particularly, an image pickup apparatus using a solid-state image pickup device such as a video camera, an electronic still camera, a broadcast camera, a surveillance camera, or an image pickup apparatus using a silver salt film. It is suitable for.

  In recent years, an imaging apparatus using a solid-state imaging element has been improved in function and the entire apparatus has been downsized. A photographing optical system used therefor is required to be a zoom lens having a small size, a high zoom ratio, and a high resolution. Further, there is a demand for a zoom lens having a vibration-proof function that reduces (corrects) image blur caused by vibration during shooting.

  Conventionally, as a zoom lens having a small size, a high zoom ratio, and an image stabilization function, first to sixth lenses having positive, negative, positive, negative, positive, and negative refractive powers in order from the object side to the image side. A six-group zoom lens composed of six lens groups is known (Patent Documents 1 and 2). In the zoom lens of Patent Document 1, image blurring when the zoom lens vibrates is corrected by translating the second lens group having a negative refractive power in a direction perpendicular to the optical axis.

  In the zoom lens of Patent Document 2, the fifth lens unit having a positive refractive power is composed of two lens components, and the lens component on the imaging surface side of the two lens components is translated in a direction perpendicular to the optical axis. By doing so, image blurring when the zoom lens vibrates is corrected.

JP 2007-192858 A JP 2008-304857 A

  Many of the zoom lenses used in the imaging apparatus are required to maintain good optical performance during image stabilization, and the entire system is small and has a high zoom ratio. In order to obtain such a zoom lens, the refractive power (optical power = reciprocal of focal length) of each zoom lens and each lens group constituting the zoom lens, the refractive power of the lens component for image stabilization, etc. are set appropriately. It becomes important to do. In order to perform the image stabilization operation at high speed, it is important to use a small and light lens component as the image stabilization lens component.

  Further, the occurrence of decentration aberrations at the time of image stabilization is small, and in order to maintain good optical performance at the time of image stabilization, it is important which lens component constituting the zoom lens is selected as a lens component for image stabilization. It is important to appropriately set the refractive power and lens configuration of the selected vibration-proof lens component.

  If these configurations are not set appropriately, it will be difficult to obtain a zoom lens having a high optical performance even when the whole system is downsized and has a high zoom ratio and vibration isolation. For example, in the above-described 6-group zoom lens, a high zoom ratio can be achieved unless the refractive power of the second lens group, which mainly performs zooming, and the imaging magnification at the wide-angle end and the telephoto end of the second lens group are set appropriately. Becomes difficult.

  If the refractive power of the first lens group is not set appropriately together with the refractive power of the second lens group, the entire system becomes large. In addition, if the image component is not used for image stabilization than the fourth lens group, which has a relatively small effective diameter and is small and lightweight, the drive mechanism for image stabilization will increase in size and the zoom lens as a whole will become larger and more resistant. It becomes difficult to perform vibration at high speed.

  It is an object of the present invention to provide a zoom lens having a small and high zoom ratio, and an image pickup apparatus having the same, which can easily perform high-speed image stabilization and easily maintain good optical performance during image stabilization. To do.

The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative lens having a negative refractive power. A zoom lens comprising a fourth lens group, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power, wherein the distance between adjacent lens groups changes during zooming, wherein the fourth lens group Is moved in a direction having a component perpendicular to the optical axis, and the imaging position is shifted in the direction perpendicular to the optical axis, and the focal length of the first lens group is changed. f1, the focal length of the second lens group is f2, the focal length of the third lens group is f3, and the focal lengths of the entire system at the wide-angle end and the telephoto end are fw and ft, respectively.
0.38 <f1 / ft <0.70
−0.16 <f2 / ft <−0.06
0.45 <f3 / fw <1.00
It satisfies the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens having a high zoom ratio and a small overall system that can easily perform high-speed image stabilization and easily maintain good optical performance during image stabilization.

Lens sectional view of Example 1 Aberration diagram when focusing on infinity in Example 1 Aberration diagram when focusing on an object distance of 2 m in Example 1 Aberration diagram when inclining the optical system at infinity in Example 1 by 0.3 ° Lens sectional view of Example 2 Aberration diagram when focusing on infinity in Example 2 Aberration diagram when focusing on an object distance of 2 m in Example 2 Aberration diagram when inclining the optical system at infinity in Example 2 by 0.3 ° Lens sectional view of Example 3 Aberration diagram when focusing on infinity in Example 3 Aberration diagram when focusing on an object distance of 2 m in Example 3 Aberration diagram when inclining the optical system of Example 3 at infinity by 0.3 ° Schematic diagram of main parts of an imaging apparatus of the present invention

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. The zoom lens according to the present invention includes, in order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a negative lens having a negative refractive power. It has a fourth lens group, a fifth lens group having a positive refractive power, and a sixth lens group having a negative refractive power. The distance between adjacent lens units changes during zooming. The entire or part of the fourth lens group is moved in a direction having a component perpendicular to the optical axis, and the imaging position is moved in the direction perpendicular to the optical axis.

  1, 5 and 9 are lens cross-sectional views at the wide angle end (short focal length end) of the zoom lenses according to the first to third embodiments of the present invention, respectively. 2, 6 and 10 are longitudinal aberration diagrams when focusing on an infinitely distant object according to each of Examples 1 to 3 of the present invention. 3, FIG. 7 and FIG. 11 are longitudinal aberration diagrams at the time of focusing on an object distance of 2 m in each of Examples 1 to 3 of the present invention. 4, 8, and 12 are lateral aberration diagrams when focusing on an infinitely distant object according to Examples 1 to 3 of the present invention and performing vibration isolation of 0.3 degrees.

  In the aberration diagrams, (A) is the wide-angle end, (B) is the intermediate zoom position, and (C) is the telephoto end (long focal length end). The object distance 2 m is a distance when a numerical example described later is expressed in units of “mm”.

  FIG. 13 is a schematic diagram of a main part of a camera (imaging device) including the zoom lens of the present invention. The zoom lens of each embodiment is a photographing lens system used in an imaging device such as a video camera, a digital camera, and a silver salt film camera. It is. In the lens cross-sectional view, the left side is the subject side (object side) (front), and the right side 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. Here, the lens group is a portion divided by an interval along the optical axis direction that fluctuates during zooming.

  In the lens cross-sectional view, L1 is a first lens group having a positive refractive power, L2 is a second lens group having a negative refractive power, and L3 is a third lens group having a positive refractive power. L4 is a fourth lens group having a negative refractive power, L5 is a fifth lens group having a positive refractive power, and L6 is a sixth lens group having a negative refractive power. Each embodiment is a positive lead type 6-group zoom lens.

  In each embodiment, SP is an aperture stop, which is disposed on the image side of the third lens unit L3. IP is an image plane, and when used as a photographing optical system for a video camera or a digital still camera, on the imaging surface of a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor, Is provided with a photosensitive surface corresponding to the film surface.

  In the aberration diagrams, d, g, S.P. C is the d-line, g-line, and sine condition, respectively. ΔM and ΔS are a meridional image plane and a sagittal image plane, respectively. Lateral chromatic aberration is represented by the g-line. ω is a half angle of view (a value half the shooting angle of view), and Fno is an F number. In the lateral aberration diagram, Y is the image height. In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the zoom lens unit is positioned at both ends of a range in which the mechanism can move on the optical axis. In each embodiment, an arrow indicates a movement locus during zooming from the wide-angle end to the telephoto end.

  An arrow F indicates the moving direction of the lens unit during focusing from an infinitely distant object to a close object.

  In each embodiment, zooming is performed by changing the interval between adjacent lens groups. In each embodiment, during zooming from the wide-angle end to the telephoto end, the first, third, fifth, and sixth lens groups L1, L3, L5, and L6 are all moved to the object side. The second lens unit L2 is moved to the image plane side. The fourth lens unit L4 is stationary.

  During zooming from the wide-angle end to the telephoto end, the interval between the first lens unit L1 and the second lens unit L2 increases, the interval between the second lens unit L2 and the third lens unit L3 decreases, and the third lens unit L3 and the third lens unit L3. The interval between the four lens units L4 is increased. Further, the distance between the fourth lens group L4 and the fifth lens group L5 is decreased, and the distance between the fifth lens group L5 and the sixth lens group L6 is decreased.

  In each of the embodiments, the second lens unit L2 having a large share of magnification and having a strong negative refractive power is configured by two positive lenses and two negative lenses, so that there is little aberration variation in the entire zoom range. Good optical performance is achieved. By not performing the image stabilization or focusing in the second lens unit L2, it is possible to reduce the increase in the size of the second lens unit L2 even when the number of lenses is increased.

  In the first embodiment, the fourth lens unit L4 having a positive refractive power is arranged in order from the object side to the image side, and the two lens components are a fourth a lens component L4a having a positive refractive power and a fourth b lens component L4b having a negative refractive power. It consists of. Then, the imaging position is moved in the direction perpendicular to the optical axis by moving the fourth lens component L4b in a direction having a component perpendicular to the optical axis. That is, vibration isolation is performed.

  In the second embodiment, as in the first embodiment, the fourth lens unit L4 having a positive refractive power is composed of two lens components, a fourth-a lens component L4a having a positive refractive power and a fourth-b lens component L4b having a negative refractive power. The image stabilization is performed by the 4b lens component L4b. In Example 3, image stabilization is performed by the entire fourth lens unit L4.

  The sixth lens unit L6 moves during focusing. As another focusing method, the fifth lens unit L5 has a 5a lens component L5a and a 5b lens component L5b, and the 5b lens component L5b and the sixth lens unit L6 move during focusing. Specifically, when focusing from an object at infinity to an object at a finite distance, the 5b lens component L5b is moved to the object side, and the sixth lens unit L6 is moved to the image plane side. As a result, aberration fluctuations during focusing are reduced.

In each embodiment, the focal lengths of the first lens unit L1, the second lens unit L2, and the third lens unit L3 are f1, f2, and f3, respectively. Let fw and ft be the focal lengths of the entire system at the wide-angle end and the telephoto end, respectively. At this time,
0.38 <f1 / ft <0.70 (1)
−0.16 <f2 / ft <−0.06 (2)
0.45 <f3 / fw <1.00 (3)
The following conditional expression is satisfied.

  Next, the technical contents of the conditional expressions (1) to (3) will be described. Conditional expressions (1) and (2) are conditional expressions for obtaining high image quality while mainly reducing the size of the entire system. If the upper limit of conditional expression (1) is exceeded and the refractive power of the first lens unit L1 becomes too weak, the lens outer diameter increases and the total lens length increases. On the other hand, if the lower limit value is exceeded and the refractive power of the first lens unit L1 becomes too strong, many high-order spherical aberrations occur, and this correction becomes difficult.

  If the upper limit of conditional expression (2) is exceeded and the negative refractive power of the second lens unit L2 becomes too large, the Petzval sum increases in the negative direction and the field curvature increases. On the other hand, if the refractive power of the second lens unit L2 is too weak beyond the lower limit value, the movement amount of each lens unit must be increased to obtain a constant zoom ratio, and the total lens length increases. This makes it difficult to downsize the entire system.

  In each embodiment of the present invention, the entire fourth lens unit L4 is used as an anti-vibration lens unit, or some lens components having negative refractive power are used as anti-vibration lens components. On the other hand, it is translated or rotated in a direction having a vertical component. As a result, the imaging position is moved in the direction perpendicular to the optical axis. That is, vibration isolation is performed. In each embodiment, a lens unit having a positive refractive power is disposed on the object side of a lens unit having a negative refractive power for vibration isolation or a lens unit having a lens component having a negative refractive power for vibration isolation.

  In each embodiment, rays converged by a lens unit having a positive refractive power disposed on the object side of a lens unit having a negative refractive power for vibration isolation or a lens unit having a lens component having a negative refractive power for vibration reduction are used. The light is incident on a vibration-proof lens group or a vibration-proof lens component. As a result, the effective diameter of the anti-vibration lens group is reduced. This reduces the size of the drive mechanism for performing vibration isolation.

  Conditional expression (3) is a conditional expression for improving the optical performance while reducing the size of the vibration-proof lens group or the vibration-proof lens component. When the upper limit of conditional expression (3) is exceeded and the refractive power of the lens unit with positive refractive power arranged on the object side of the lens unit for image stabilization or the lens unit having the lens component for image stabilization becomes too weak The luminous flux incident on the lens group for vibration isolation or the lens component for vibration isolation cannot be sufficiently converged.

  If it does so, the lens group for image stabilization or the lens component for image stabilization will enlarge. If the lower limit of conditional expression (3) is exceeded, the lens group for vibration isolation or the lens component for vibration isolation can be easily downsized, but the refractive power of the lens group with positive refractive power is too strong, so optical performance Will get worse.

  With the above configuration, it is possible to realize a compact and high-performance telephoto zoom lens having an anti-vibration function, but it is more preferable to satisfy at least one of the following conditional expressions.

  Let the focal length of the fourth lens unit L4 be f4. Let the focal length of the 4b lens component L4b be f4b. The focal lengths of the fifth lens unit L5 and the fifth b lens component L5b are f5 and f5b, respectively. Let the focal length of the sixth lens unit L6 be f6. At this time, it is preferable to satisfy one or more of the following conditional expressions.

−0.20 <f4 / ft <−0.08 (4)
0.40 <f4b / f4 <1.20 (5)
−0.24 <f6 / ft <−0.10 (6)
0.80 <f5b / f5 <2.40 (7)
Next, the technical meaning of the conditional expressions (4) to (7) will be described.

  Conditional expression (4) relates to the refractive power of the fourth lens unit L4 as the anti-vibration lens unit or the fourth lens unit L4 including the lens component for image stabilization. By satisfying this conditional expression (4), high image quality is maintained while suppressing the amount of displacement of the image stabilizing lens group or the image stabilizing lens component during image stabilization.

  In the first and second embodiments, the fourth lens unit L4 includes a fourth-a lens component L4a having a positive refractive power and a fourth-b lens component L4b having a negative refractive power, and the fourth-b lens component L4b is used for vibration isolation. As a result, the refractive power of the 4b lens component L4b can be increased, and the amount of displacement of the lens component for image stabilization necessary at the time of image stabilization is reduced. Further, by arranging the anti-vibration 4b lens component L4b on the image plane side of the third lens unit L3 having positive refractive power, the light beam converged by the third lens unit L3 is incident on the 4b lens component L4b. Thus, the effective lens diameter of the 4b lens component L4b is reduced. As a result, the drive mechanism and the like for performing vibration isolation are also downsized.

  In Example 3, the entire fourth lens unit L4 performs image stabilization. At this time, the same effect is obtained by the third lens unit L3 having positive refractive power on the object side of the fourth lens unit L4. Conditional expression (5) corresponds to Examples 1 and 2, and relates to the refractive power of the 4b lens component which is a lens component for image stabilization. By satisfying this conditional expression (5), high image quality is maintained while suppressing the amount of shift of the image stabilizing lens component for image stabilization. If the conditional expression (5) is not satisfied, it is difficult to obtain these effects.

  In each embodiment of the present invention, the sixth lens unit L6 is moved during focusing. In the telephoto zoom lens, since the effective lens diameter of the first lens unit is large, the so-called front lens focus method using the first lens unit for focusing slows the focusing speed because the lens weight of the first lens unit is heavy. There are disadvantages. In addition, since a high-torque motor is required for driving the focus, the entire zoom lens becomes large. Therefore, in order to realize a reduction in size of the entire system with a telephoto zoom lens, it is preferable to perform focusing with a lens group other than the first lens group having a small effective lens diameter.

  In order from the object side to the image side, a telephoto zoom lens composed of six groups of first to sixth lens units having positive, negative, positive, negative, positive, and negative refractive powers has a positive refractive power lens group and A light beam is incident on a negative refractive power lens group adjacent to the image plane side in a state where the light is converged by the positive refractive power lens group. For this reason, the effective lens diameter of the lens unit having a negative refractive power is reduced. Since the second lens group has a large variable power share and a large refractive power, it is not good to perform focusing with the second lens group because the fluctuation of aberration increases during focusing.

  In the zoom lens according to the present invention, since a part or all of the fourth lens group performs image stabilization, a plurality of lens groups including the sixth lens group L6 are moved to perform focusing, thereby performing the entire system. Miniaturization is realized. Conditional expression (6) is for achieving good focusing while reducing aberration variation with respect to the focal length of the sixth lens unit L6, which is a part of the focusing lens unit.

  When the upper limit value of conditional expression (6) is exceeded, the refractive power of the sixth lens unit L6 becomes too strong, so that aberration fluctuations, particularly fluctuations in field curvature, become large. When the lower limit value of conditional expression (6) is exceeded, the refractive power of the sixth lens unit L6 becomes weak, so that the amount of movement during focusing increases and the total lens length increases.

  Further, in each embodiment, the fifth lens unit L5 is divided into a 5a lens component L5a having a positive refractive power and a 5b lens component L5b having a positive refractive power. In order to reduce aberration fluctuations during focusing, so-called floating is performed in which the fifth lens component L5b is moved together with the sixth lens unit L6. This reduces aberration fluctuations during focusing, particularly fluctuations in field curvature.

  Conditional expression (7) relates to the ratio of the focal lengths of the fifth lens unit L5 and the fifth b lens component L5b, and is mainly for reducing fluctuations in field curvature during focusing. If the conditional expression (7) is not satisfied, it becomes difficult to obtain good optical performance in the entire focusing area.

  More preferably, the numerical ranges of the conditional expressions (1) to (7) are set as follows.

0.40 <f1 / ft <0.60 (1a)
−0.14 <f2 / ft <−0.09 (2a)
0.50 <f3 / fw <0.95 (3a)
−0.18 <f4 / ft <−0.09 (4a)
0.50 <f4b / f4 <1.00 (5a)
−0.21 <f6 / ft <−0.12 (6a)
1.00 <f5b / f5 <2.20 (7a)
More preferably, the numerical ranges of the conditional expressions (1a) to (7a) are set as follows.

0.42 <f1 / ft <0.55 (1b)
−0.130 <f2 / ft <−0.100 (2b)
0.60 <f3 / fw <0.90 (3b)
−0.160 <f4 / ft <−0.100 (4b)
0.60 <f4b / f4 <0.80 (5b)
−0.19 <f6 / ft <−0.14 (6b)
1.20 <f5b / f5 <2.00 (7a)
As mentioned above, although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

  FIG. 13 is a schematic diagram of a main part of a digital still camera using the zoom lens of each embodiment. In FIG. 13, reference numeral 20 denotes a camera body, and reference numeral 21 denotes a photographing optical system constituted by any of the zoom lenses described in each embodiment. Reference numeral 22 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the photographing optical system 21 and is built in the camera body 20.

  Hereinafter, specific numerical data of Numerical Examples 1 to 3 corresponding to Examples 1 to 3 will be shown. In each numerical example, i indicates the number of the surface counted from the object side. ri is the radius of curvature of the i-th optical surface (i-th surface). di is the axial distance between the i-th surface and the (i + 1) -th surface. ndi and νdi are the refractive index and Abbe number of the material of the i-th optical member with respect to the d-line, respectively.

Numerical example 1
Surface data surface number rd nd νd Effective diameter
1 121.962 2.80 1.80610 33.3 68.41
2 87.545 0.08 66.96
3 87.234 8.67 1.43387 95.1 66.97
4 -12946.695 0.15 66.60
5 137.142 5.09 1.43387 95.1 65.44
6 1661.769 (variable) 64.94
7 1137.659 2.18 1.80518 25.4 29.63
8 -124.606 1.40 1.69680 55.5 29.38
9 41.577 4.07 28.25
10 -74.413 1.40 1.60311 60.6 28.27
11 128.778 1.79 1.80610 33.3 29.00
12 -1334.571 (variable) 29.14
13 205.890 2.77 1.61800 63.4 29.70
14 -150.170 0.20 29.86
15 43.022 5.55 1.49700 81.5 30.03
16 -186.166 6.27 29.56
17 -54.513 2.00 1.84666 23.9 27.50
18 -98.865 3.50 27.58
19 (Aperture) ∞ (Variable) 26.77
20 -111.054 2.22 1.61340 44.3 26.25
21 -48.913 5.10 26.22
22 1529.124 1.50 1.88300 40.8 23.73
23 71.550 2.17 23.30
24 -65.884 2.48 1.80809 22.8 23.29
25 -28.155 1.50 1.69680 55.5 23.42
26 130.130 (variable) 23.82
27 145.988 4.42 1.48749 70.2 27.68
28 -41.613 0.15 27.84
29 70.430 3.16 1.61800 63.4 27.20
30 -164.101 1.86 26.88
31 -40.607 1.60 1.84666 23.9 26.81
32 -134.286 13.17 26.99
33 131.235 1.35 1.84666 23.9 27.73
34 59.051 4.91 1.72000 46.0 27.84
35 -69.753 (variable) 28.00
36 229.768 1.35 1.88300 40.8 26.21
37 38.325 0.47 25.70
38 45.684 7.35 1.80 100 35.0 25.74
39 -22.442 1.35 1.78590 44.2 25.62
40 57.633 (variable) 25.04
Image plane ∞

Various data Zoom ratio 3.89
Wide angle Medium telephoto focal length 100.00 195.31 388.95
F number 4.63 5.03 5.83
Angle of View 12.21 6.32 3.18
Image height 21.64 21.64 21.64
Total lens length 240.00 288.31 308.04
BF 75.67 81.85 98.43

d 6 3.37 63.18 97.00
d12 22.69 13.37 1.48
d19 7.87 5.68 3.48
d26 13.73 9.84 2.07
d35 12.64 10.35 1.54
d40 75.67 81.85 98.43

Entrance pupil position 52.33 200.05 383.80
Exit pupil position -70.12 -58.29 -42.67
Front principal point position 83.73 123.17 -299.40
Rear principal point position -24.33 -113.46 -290.52

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 189.13 16.79 3.03 -8.45
2 7 -46.81 10.84 3.14 -4.78
3 13 64.78 20.29 -1.67 -17.54
4a 20 140.60 2.22 2.42 1.07
4b 22 -38.60 7.65 2.22 -2.94
5a 27 70.71 11.19 -0.72 -8.21
5b 33 69.14 6.26 2.45 -1.18
6 36 -68.39 10.52 5.06 -0.89

Single lens Data lens Start surface Focal length
1 1 -399.35
2 3 199.75
3 5 344.17
4 7 139.59
5 8 -44.59
6 10 -77.99
7 11 145.78
8 13 140.93
9 15 70.88
10 17 -146.55
11 20 140.60
12 22 -85.05
13 24 59.10
14 25 -33.09
15 27 66.94
16 29 80.15
17 31 -69.29
18 33 -127.90
19 34 45.13
20 36 -52.26
21 38 19.73
22 39 -20.40

Numerical example 2
Surface data surface number rd nd νd Effective diameter
1 130.059 2.80 1.80610 33.3 74.53
2 90.894 0.09 72.92
3 90.741 9.02 1.43387 95.1 72.93
4 1139.973 0.15 72.56
5 100.933 7.55 1.43387 95.1 71.11
6 1716.667 (variable) 70.54
7 -457.894 2.05 1.80518 25.4 30.28
8 -105.016 1.40 1.69680 55.5 29.73
9 37.074 4.21 27.26
10 -69.022 1.40 1.60311 60.6 27.19
11 66.863 2.33 1.80610 33.3 27.09
12 -1930.181 (variable) 27.03
13 237.749 2.64 1.61800 63.4 26.58
14 -120.007 0.20 26.75
15 42.956 4.75 1.49700 81.5 26.90
16 -151.409 4.95 26.52
17 -50.178 2.00 1.84666 23.9 25.05
18 -88.126 3.50 25.16
19 (Aperture) ∞ (Variable) 24.42
20 -139.252 2.18 1.61340 44.3 23.11
21 -46.452 1.00 23.06
22 -1387.404 1.50 1.88300 40.8 22.11
23 66.431 1.97 21.62
24 -66.579 2.36 1.80809 22.8 21.61
25 -27.289 1.50 1.69680 55.5 21.71
26 140.406 (variable) 21.92
27 184.939 3.89 1.48749 70.2 25.29
28 -40.489 0.15 25.45
29 69.497 2.95 1.61800 63.4 24.93
30 -145.597 1.60 24.62
31 -39.302 1.60 1.84666 23.9 24.55
32 -123.734 11.61 24.69
33 110.405 1.35 1.84666 23.9 27.24
34 49.810 5.00 1.72000 46.0 27.34
35 -66.783 (variable) 27.48
36 251.113 1.35 1.88300 40.8 26.13
37 38.583 0.46 25.63
38 45.456 6.97 1.80 100 35.0 25.67
39 -23.097 1.35 1.78590 44.2 25.58
40 56.445 (variable) 25.13
Image plane ∞

Various data Zoom ratio 5.45
Wide angle Medium Telephoto focal length 71.33 144.71 388.95
F number 4.63 4.84 5.83
Angle of View 16.87 8.50 3.18
Image height 21.64 21.64 21.64
Total lens length 240.00 284.68 303.83
BF 75.92 79.30 95.93

d 6 3.50 60.77 96.57
d12 32.93 21.79 1.50
d19 6.12 4.66 8.31
d26 16.31 12.91 2.18
d35 7.38 7.40 1.50
d40 75.92 79.30 95.93

Entrance pupil position 54.38 209.47 439.67
Exit pupil position -69.56 -58.29 -42.75
Front principal point position 90.73 201.98 -262.21
Rear principal point position 4.59 -65.41 -293.02

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 174.23 19.61 3.95 -9.52
2 7 -39.68 11.40 2.59 -5.70
3 13 61.62 18.05 -0.78 -14.99
4a 20 112.63 2.18 2.01 0.67
4b 22 -36.43 7.33 1.91 -2.98
5a 27 70.97 10.19 -0.45 -7.28
5b 33 63.69 6.35 2.38 -1.31
6 36 -66.57 10.13 4.85 -0.88

Single lens Data lens Start surface Focal length
1 1 -386.79
2 3 226.64
3 5 246.82
4 7 168.80
5 8 -39.17
6 10 -56.10
7 11 80.21
8 13 129.41
9 15 67.88
10 17 -141.04
11 20 112.63
12 22 -71.76
13 24 55.73
14 25 -32.67
15 27 68.53
16 29 76.52
17 31 -68.62
18 33 -108.30
19 34 40.35
20 36 -51.78
21 38 20.03
22 39 -20.70

Numerical Example 3
Surface data surface number rd nd νd Effective diameter
1 120.374 2.80 1.83400 37.2 67.83
2 81.698 -0.00 66.23
3 78.812 9.42 1.43387 95.1 66.26
4 90141.143 0.15 65.87
5 118.069 5.74 1.43387 95.1 64.63
6 1661.895 (variable) 64.08
7 -804.483 2.09 1.80518 25.4 30.74
8 -114.169 1.40 1.72916 54.7 30.18
9 43.649 3.92 27.89
10 -69.850 1.40 1.60311 60.6 27.80
11 120.066 1.91 1.80610 33.3 27.58
12 -411.325 (variable) 27.51
13 188.058 2.32 1.61800 63.4 27.39
14 -288.123 0.20 27.51
15 42.903 4.92 1.49700 81.5 27.70
16 -155.402 1.17 27.34
17 -56.436 2.00 1.84666 23.9 27.31
18 -65.570 3.50 27.40
19 (Aperture) ∞ (Variable) 25.94
20 -656.647 1.50 1.90366 31.3 22.83
21 75.636 2.15 22.49
22 -56.403 2.74 1.80809 22.8 22.50
23 -23.506 1.50 1.69680 55.5 22.67
24 405.756 (variable) 23.26
25 1346.507 4.26 1.48749 70.2 26.53
26 -33.276 0.15 26.80
27 64.849 3.03 1.59282 68.6 26.19
28 -194.521 1.83 25.89
29 -39.188 1.60 1.84666 23.9 25.86
30 -122.259 0.15 26.10
31 456.783 1.83 1.48749 70.2 26.07
32 -133.018 13.10 26.03
33 130.237 1.35 1.84666 23.9 28.44
34 58.582 4.59 1.72000 46.0 28.44
35 -77.053 (variable) 28.50
36 557.271 1.35 1.88300 40.8 26.74
37 32.813 0.48 26.21
38 36.845 7.05 1.83400 37.2 26.31
39 -27.590 1.35 1.77250 49.6 26.22
40 48.320 (variable) 25.54
Image plane ∞

Various data Zoom ratio 5.49
Wide angle Medium Telephoto focal length 69.67 137.78 382.19
F number 4.63 4.94 5.83
Angle of view 17.25 8.92 3.24
Image height 21.64 21.64 21.64
Total lens length 239.15 273.52 301.64
BF 76.34 78.90 96.00

d 6 2.30 51.30 96.00
d12 35.40 19.16 1.48
d19 7.90 9.52 10.61
d24 17.49 12.47 2.18
d35 6.79 9.24 2.44
d40 76.34 78.90 96.00

Entrance pupil position 51.79 158.22 376.67
Exit pupil position -73.88 -62.25 -43.60
Front principal point position 89.15 161.51 -287.50
Rear principal point position 6.66 -58.87 -286.20

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 178.52 18.10 3.58 -8.80
2 7 -44.94 10.72 2.53 -5.26
3 13 55.74 14.10 2.21 -8.60
4 20 -40.18 7.89 1.59 -3.72
5a 25 55.91 12.85 2.00 -7.00
5b 33 73.85 5.94 2.23 -1.21
6 36 -60.80 10.23 4.43 -1.24

Single lens Data lens Start surface Focal length
1 1 -315.26
2 3 181.80
3 5 292.61
4 7 165.02
5 8 -43.14
6 10 -73.02
7 11 115.48
8 13 184.47
9 15 68.21
10 17 -531.92
11 20 -74.98
12 22 48.09
13 23 -31.84
14 25 66.68
15 27 82.40
16 29 -68.73
17 31 211.54
18 33 -126.86
19 34 46.89
20 36 -39.53
21 38 19.91
22 39 -22.56

L1: First lens group L2: Second lens group L3: Third lens group L4: Fourth lens group L5: Fifth lens group L6: Sixth lens group L4a: Fourth lens component L4b: Fourth lens component L5a: 5a lens component L5b: 5b lens component L6: 6th lens group SP: Aperture stop

Claims (10)

In order from the object side to the image side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, a fourth lens group having a negative refractive power, and a positive lens The zoom lens includes a fifth lens group having a refractive power and a sixth lens group having a negative refractive power, and the distance between adjacent lens groups changes during zooming. The imaging position is moved in a direction perpendicular to the optical axis by moving in a direction having a component perpendicular to the optical axis, the focal length of the first lens group is f1, and the second lens group Where f2 is the focal length of the third lens unit, f3 is the focal length of the third lens group, and fw and ft are the focal lengths of the entire system at the wide-angle end and the telephoto end, respectively.
0.38 <f1 / ft <0.70
−0.16 <f2 / ft <−0.06
0.45 <f3 / fw <1.00
A zoom lens satisfying the following conditional expression: When the focal length of the fourth lens group is f4,
−0.20 <f4 / ft <−0.08
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   The fourth lens group has a 4a lens component having a positive refractive power and a 4b lens component having a negative refractive power, and the 4b lens component is moved in a direction having a component perpendicular to the optical axis. The zoom lens according to claim 1, wherein the image forming position is moved in a direction perpendicular to the optical axis. When the focal length of the fourth lens component is f4b and the focal length of the fourth lens group is f4,
0.40 <f4b / f4 <1.20
The zoom lens according to claim 3, wherein the following conditional expression is satisfied.   5. The zoom lens according to claim 1, wherein the sixth lens group moves during focusing. 6. When the focal length of the sixth lens group is f6,
−0.24 <f6 / ft <−0.10
The zoom lens according to claim 1, wherein the following conditional expression is satisfied.   The said 5th lens group has a 5a lens component and a 5b lens component, and the said 5b lens component and the said 6th lens group move in the case of focusing. Zoom lens described in 1. When the focal length of the fifth lens component is f5b and the focal length of the fifth lens group is f5,
0.80 <f5b / f5 <2.40
The zoom lens according to claim 7, wherein the following conditional expression is satisfied.   During zooming from the wide-angle end to the telephoto end, the first lens group, the third lens group, the fifth lens group, and the sixth lens group move toward the object side, and the second lens group moves toward the image side. The zoom lens according to claim 1, wherein the fourth lens group is stationary.   An image pickup apparatus comprising: the zoom lens according to claim 1; and an image pickup element that receives an image formed by the zoom lens.