JP2013182246A - Zoom lens and image pickup device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a zoom lens with a large diameter including a mechanism for vibration compensation (vibration insulation), and having a vibration isolating function capable of obtaining an image which is satisfactory in vibration compensation.SOLUTION: In a zoom lens including a first lens group with a positive refractive power, a second lens group with a negative refractive power, a third lens group with a positive refractive power, a fourth lens group with a negative refractive power, and a fifth lens group with a positive refractive power successively from an object side to an image side in which the intervals of those lens groups change in the case of zooming, the fourth lens group has a lens group IS with a negative refractive force for moving an imaging position in a direction vertical to an optical axis by moving in a direction having components in the direction vertical to the optical axis, and a focal distance f1 of the first lens group and a focal distance f3 of the third lens group are appropriately installed.

Description

  The present invention relates to a zoom lens and an imaging apparatus having the same, and is suitably used for electronic cameras such as video cameras and digital still cameras, film cameras, broadcast cameras, and the like.

  When vibration is accidentally transmitted to the photographing optical system, image blurring occurs in the photographed image. Conventionally, various zoom lenses having a mechanism (anti-vibration mechanism) for compensating for image blur due to this accidental vibration have been proposed. 2. Description of the Related Art As an anti-vibration mechanism, a photographing optical system is known that compensates for image blur due to vibration by moving a part of a lens group constituting a photographing optical system (zoom lens) in a direction substantially perpendicular to the optical axis. Among these, in order from the object side to the image side, in a five-group zoom lens including lens groups having positive, negative, positive, negative, and positive refractive power, all or a part of the fourth lens group is defined as an optical axis. Zoom lenses that compensate for image blur by moving in the vertical direction are known (Patent Documents 1 and 2).

JP 2006-227526 A JP 2008-216440 A

  In general, when the photographing optical system is tilted by vibration, the photographed image is displaced by an amount corresponding to the tilt angle and the focal length of the photographing optical system. For this reason, there is a problem in the still image capturing device that the shooting time must be sufficiently shortened to prevent the deterioration of the image quality, and in the moving image capturing device, it is difficult to maintain the composition setting. There is a problem of becoming. Therefore, in such shooting, it is necessary to correct so as not to cause a change in the shot image, that is, a so-called blur of the shot image, even when the shooting optical system is tilted by vibration.

  In addition, in general, a mechanism that obtains a still image by vibrating a part of the lens group of the photographic optical system to eliminate a blur of the photographed image has a large correction amount of the blur of the image and a lens group that vibrates for the blur correction. There is a demand for a small amount of movement and rotation of the (anti-vibration lens group). And the whole apparatus is requested to be small.

  As is well known, when the vibration-proof lens group is decentered, many decentration aberrations are generated. For this reason, in many cases, when an image blur is corrected, the image is blurred due to the occurrence of decentration aberration. Therefore, in an imaging optical system having an image stabilization function, it is necessary that the amount of decentration aberration generated when the image stabilization lens group is moved in the direction orthogonal to the light beam to be in an eccentric state is small. In addition, the image stabilization sensitivity (the ratio ΔX / ΔH of the image blur correction amount ΔX with respect to the unit movement amount ΔH of the image stabilization lens group) is appropriately set, and the image blur correction response. In order to improve the performance, it is necessary to reduce the weight of the vibration-proof lens group and to reduce the outer diameter of the lens.

  However, when the diameter of the photographing optical system is increased, the weight of the anti-vibration lens group is increased, and it is difficult to reduce the outer diameter of the lens. For the above reasons, in a zoom lens having an anti-vibration function, by appropriately setting the lens configuration and the lens configuration of the anti-vibration lens group to be moved for anti-vibration, the amount of occurrence of decentering aberration is reduced in anti-vibration. It becomes important to do.

  An object of the present invention is to provide a zoom lens that has a mechanism for vibration compensation (anti-vibration) and has a large aperture and can obtain a good image at the time of vibration compensation, and an imaging apparatus having the same.

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, In a zoom lens having a fourth lens group having a refractive power and a fifth lens group having a positive refractive power, and the distance between the lens groups changes during zooming,
The fourth lens group includes a lens unit IS having a negative refractive power that moves the imaging position in a direction perpendicular to the optical axis by moving in a direction having a component perpendicular to the optical axis. When the focal length of one lens unit is f1, and the focal length of the third lens unit is f3, 4.3 <f1 / f3 <6.0
It satisfies the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens that has a mechanism for vibration compensation (anti-vibration) and has an anti-vibration function that can obtain a good image at the time of vibration compensation even though it has a large aperture.

Sectional view of the lens when focusing on an object at infinity at the wide-angle end (short focal length end) of the zoom lens of Embodiment 1 of the present invention (A) (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end (long focal length end) when focusing on an object at infinity in the zoom lens of Example 1 (A) (B) Lateral aberration diagrams at the wide-angle end and the telephoto end when the zoom lens of Example 1 is focused on an object at infinity and is shaken with the zoom lens tilted 0.3 °. Sectional view of the lens when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention (A) (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end (long focal length end) when focusing on an object at infinity in the zoom lens of Example 2 (A) (B) Lateral aberration diagrams at the wide-angle end and the telephoto end when the zoom lens of Example 2 focuses on an object at infinity and is shaken with the zoom lens tilted by 0.3 °. Sectional view of a lens when focusing on an object at infinity at the wide-angle end of a zoom lens according to Embodiment 3 of the present invention (A) (B) Longitudinal aberration diagrams at the wide-angle end and the telephoto end (long focal length end) when focusing on an object at infinity in the zoom lens of Example 3 (A) (B) Lateral aberration diagrams at the wide-angle end and the telephoto end when the zoom lens of Example 3 is focused on an object at infinity and is shaken with the zoom lens tilted by 0.3 °. Schematic diagram of main parts of an imaging apparatus of the present invention

  Embodiments of the zoom lens of the present invention and an image pickup apparatus having the same will be described below. 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, It has a fourth lens group having a refractive power and a fifth lens group having a positive refractive power. The distance between the lens groups changes during zooming. The fourth lens group includes a lens unit IS having a negative refractive power that moves the imaging position in a direction perpendicular to the optical axis by moving in a direction having a component perpendicular to the optical axis.

  FIG. 1 is a lens cross-sectional view when focusing on an object at infinity at the wide angle end (short focal length end) of the zoom lens according to Embodiment 1 of the present invention. FIGS. 2A and 2B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end (long focal length end) of the zoom lens of Example 1. FIGS. FIGS. 3A and 3B show the zoom lens of Example 1 when the zoom lens is focused at infinity at the wide-angle end and the telephoto end, and the zoom lens is shaken with a tilt of 0.3 °. It is a lateral aberration diagram.

  FIG. 4 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 2 of the present invention. FIGS. 5A and 5B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens of Example 2. FIGS. 6A and 6B show the zoom lens of Example 2 when the zoom lens is focused at infinity at the wide-angle end and the telephoto end, and the zoom lens is tilted by 0.3 ° and is shaken. It is a lateral aberration diagram.

  FIG. 7 is a lens cross-sectional view when focusing on an object at infinity at the wide-angle end of the zoom lens according to Embodiment 3 of the present invention. FIGS. 8A and 8B are longitudinal aberration diagrams when focusing on an object at infinity at the wide-angle end and the telephoto end of the zoom lens of Example 3. FIGS. FIGS. 9A and 9B are lateral aberration diagrams when the zoom lens of Example 3 is in focus on an object at infinity at the telephoto end and when the zoom lens is shaken by 0.3 °. It is. FIG. 10 is a schematic diagram of a main part of a camera (image pickup apparatus) including the zoom lens according to the present invention. The zoom lens according to each embodiment is a photographing lens system used in an imaging apparatus such as a video camera, a digital camera, and a silver salt film camera.

  In the lens cross-sectional view, the left side is the 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. In FIGS. 1, 4, and 7, 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, and L4. Is a fourth lens group having a negative refractive power, and L5 is a fifth lens group having a positive refractive power. Here, the fourth lens unit L4 includes an anti-vibration lens unit (anti-vibration lens unit) IS having a negative refractive power that moves so as to have a component perpendicular to the optical axis and moves the imaging position. doing.

  The refractive power is optical power and is the reciprocal of the focal length. SP is an aperture stop, which is disposed on the object 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 and g are d-line and g-line, respectively. ΔM and ΔS are meridional image surfaces, sagittal image surfaces, and lateral chromatic aberration is represented by g-line. ω is a half angle of view, and Fno is an F number. In the lateral aberration diagram, Y is the image height. The solid line is the meridional image plane, and the broken line is the sagittal image plane. In the lateral aberration diagram, the horizontal axis is the height on the pupil plane. In the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the lens groups are positioned at both ends of a range in which the lens group can move on the optical axis. The arrows indicate the movement trajectory of each lens unit during zooming from the wide-angle end to the telephoto end.

  In Examples 1, 2, and 3 of FIGS. 1, 4, and 7, the first lens unit L1 moves toward the object side as indicated by an arrow during zooming from the wide-angle end to the telephoto end. The second lens unit L2 moves while increasing the distance from the first lens unit L1. The third lens unit L3 moves toward the object side while decreasing the distance from the second lens unit L2. The fourth lens unit L4 moves toward the object side while increasing the distance from the third lens unit L3. The fifth lens unit L5 moves toward the object side while decreasing the distance from the fourth lens unit L4. The aperture stop SP moves together with the third lens unit L3. The aperture stop SP may be moved independently of the other lens groups during zooming.

  Focusing is performed by moving the second lens unit L2 in the optical axis direction. Focusing may be performed by moving the entire zoom lens or any one lens group. In each embodiment, the lens group IS for anti-vibration is constituted by all or a part of the fourth lens unit L4. The lens group IS moves so as to have a component perpendicular to the optical axis, shifts the image in the direction perpendicular to the optical axis, and corrects image blur when the entire zoom lens vibrates. That is, vibration isolation is performed.

  In the first and third embodiments, the fourth lens unit L4 includes an anti-vibration lens unit IS. In the second embodiment, the fourth lens unit L4 includes an anti-vibration lens unit IS and a lens having a negative refractive power. The lens group IS includes a cemented lens in which a positive lens and a negative lens are cemented. In each embodiment, a lens unit having a small refractive power may be added to the object side of the first lens unit L1 or the image side of the most image side lens unit. A teleconverter lens, a wide converter lens, or the like may be disposed on the object side or the image side.

  Next, features of each embodiment will be described. In general, in order to reduce the size of a lens group, it is necessary to reduce the lens outer diameter (lens effective diameter). In order to reduce the lens outer diameter, it is necessary to sufficiently converge the light beam incident on the lens group on the light incident side of the lens group. Therefore, in each embodiment, the first lens unit having a strong positive refractive power is disposed on the object side of the second lens unit L2.

In the zoom lens of each embodiment, the third lens group and the fourth lens group are moved during zooming so that the distance between the third lens group and the fourth lens group at the telephoto end is larger than that at the wide angle end. I am letting. As a result, at the telephoto end where the axial light beam diameter increases, it is easy to secure a distance for converging the axial light beam emitted from the third lens unit L3, and it is easy to reduce the size of the lens group IS for vibration isolation. . In the zoom lens of each embodiment, when the focal length of the first lens unit L1 is f1, and the focal length of the third lens unit is f3,
4.3 <f1 / f3 <6.0 (1)
The following conditional expression is satisfied.

  Conditional expression (1) appropriately sets the ratio of the focal lengths of the first lens unit L1 and the third lens unit L3. If the lower limit of conditional expression (1) is exceeded and the focal length of the first lens unit L1 is shortened, spherical aberration increases at the telephoto end, making correction difficult. In addition, since the positive refractive power of the third lens unit L3 becomes weak and the converging action of the axial light beam by the third lens unit L3 becomes too small, it is difficult to reduce the size of the vibration-proof lens unit IS. If the positive refractive power of the third lens unit L3 is increased beyond the upper limit, it becomes difficult to reduce the variation of spherical aberration due to zooming.

  In addition, it is difficult to achieve a telephoto type power arrangement at the telephoto end, and it is difficult to make the F number brighter (smaller) at the telephoto end. More preferably, the numerical range of conditional expression (1) is set as follows.

4.4 <f1 / f3 <5.0 (1a)
In the optical system of each embodiment, it is preferable to satisfy one or more of the following conditional expressions. According to this, an effect corresponding to each conditional expression can be obtained. The focal length of the lens group IS is fIS, and the focal length of the entire system at the telephoto end is ft. Let the focal length of the second lens unit L2 be f2.

At this time,
0.3 <| fIS / ft | <1.5 (2)
0.15 <| f2 / ft | <0.40 (3)
It is preferable to satisfy one or more of the following conditional expressions.

  Conditional expression (2) appropriately sets the focal length of the lens unit IS having a negative refractive power for image stabilization. If the upper limit of conditional expression (2) is exceeded and the negative refractive power of the lens group IS becomes weak, it becomes difficult to increase the image stabilization sensitivity at the telephoto end. Also, if the negative refractive power of the lens unit IS becomes too strong beyond the lower limit value, the sensitivity of image stabilization becomes too large, and it is difficult to perform image stabilization with high accuracy.

  Conditional expression (3) sets the focal length of the second lens unit L2 appropriately. If the negative refractive power of the second lens unit L2 becomes too strong beyond the lower limit of conditional expression (3), negative distortion will increase especially at the wide angle end, making correction difficult, and exceeding the upper limit. If the negative refractive power of the second lens unit L2 becomes weak, it becomes difficult to ensure a high zoom ratio. More preferably, the numerical ranges of conditional expressions (2) and (3) should be set as follows.

0.4 <| fIS / ft | <1.4 (2a)
0.18 <| f2 / ft | <0.35 (3a)
In each embodiment, the first lens unit L1 includes a cemented lens and a positive lens in which a negative lens and a positive lens are cemented in order from the object side to the image side.

  The second lens unit L2 includes, in order from the object side to the image side, a negative lens, a cemented lens obtained by cementing a negative lens and a positive lens, a positive lens, and a negative lens. The third lens unit L3 includes, in order from the object side to the image side, a positive lens, a cemented lens in which a negative lens and a positive lens are cemented, and a cemented lens in which a positive lens and a negative lens are cemented. Alternatively, the third lens unit L3 includes a positive lens, a cemented lens obtained by cementing a negative lens and a positive lens, and a positive lens in order from the object side to the image side. The fifth lens unit L5 includes, in order from the object side to the image side, a positive lens, a cemented lens in which a positive lens and a negative lens are cemented, and a positive lens.

  As described above, according to each embodiment, although having a large diameter, a mechanism for vibration compensation (anti-vibration) is provided, the entire apparatus can be easily downsized, and a good image can be obtained at the time of vibration compensation. Therefore, it is possible to obtain a zoom lens having an anti-vibration function.

  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. In FIG. 10, 10 is a single-lens reflex camera body, and 11 is an interchangeable lens equipped with a zoom lens according to the present invention. Reference numeral 12 denotes a photosensitive surface such as a silver salt film for recording a subject image obtained through the interchangeable lens 11 or a solid-state imaging device (photoelectric conversion device) for receiving the subject image. Reference numeral 13 denotes a finder optical system for observing a subject image from the interchangeable lens 11, and reference numeral 14 denotes a rotating quick return mirror for switching and transmitting the subject image from the interchangeable lens 11 to the photosensitive surface 12 and the finder optical system 13.

  When observing the subject image with the finder, the subject image formed on the focusing plate 15 via the quick return mirror 14 is made into an erect image with the pentaprism 16 and then magnified and observed with the eyepiece optical system 17.

  At the time of shooting, the quick return mirror 14 rotates in the direction of the arrow, and the subject image is formed and recorded on the photosensitive surface recording means 12. Thus, by applying the zoom lens of the present invention to an optical device such as a single lens reflex camera interchangeable lens, an optical device having high optical performance can be realized. The present invention can be similarly applied to an SLR (Single Lens Reflex) camera having no quick return mirror. Further, the zoom lens of the present invention can be similarly applied to a video camera.

  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.

  In the following, numerical examples 1 to 3 corresponding to the first to third examples will be described. In each numerical example, i indicates the order of the surfaces from the object side, ri is the i-th (i-th surface) radius of curvature, di is the distance between the i-th surface and the (i + 1) -th surface, ndi, νdi Represents the refractive index and the Abbe number based on the d-line of the i-th lens material. f is a focal length, and Fno is an F number. (Aspheric data) shows the aspheric coefficient when the aspheric surface is expressed by the following equation.

However,
x: Displacement from the reference plane in the optical axis
h: Height in the direction perpendicular to the optical axis
R: Radius of base quadric surface
k: Conical constant
An: nth-order aspheric coefficient “EZ” means “10 ^−Z ”. Table 1 shows the relationship between the above-described conditional expressions and numerical values in the numerical examples.

[Numerical Example 1]

Unit mm

Surface data surface number rd nd νd
1 256.516 2.00 1.84666 23.9
2 80.205 8.58 1.77250 49.6
3 770.556 0.15
4 51.899 5.86 1.80 400 46.6
5 88.386 (variable)
6 * 96.827 0.05 1.52421 51.4
7 61.208 1.50 1.88300 40.8
8 16.132 8.17
9 -44.889 1.20 1.75 500 52.3
10 18.254 6.26 1.83400 37.2
11 137.231 0.15
12 75.532 3.50 1.80518 25.4
13 -125.489 3.69
14 -23.650 1.20 1.60 300 65.4
15 -49.394 (variable)
16 (Aperture) ∞ 0.34
17 29.857 5.16 1.49700 81.5
18 240.448 0.15
19 33.821 1.60 1.83400 37.2
20 18.930 11.32 1.49700 81.5
21 -223.501 0.15
22 * 73.830 8.32 1.77250 49.6
23 -23.883 1.50 1.83400 37.2
24 -60.570 (variable)
25 -74.277 4.16 1.80809 22.8
26 -21.944 1.20 1.81600 46.6
27 * 45.883 (variable)
28 35.978 7.44 1.59240 68.3
29 -55.746 0.15
30 148.721 4.39 1.49700 81.5
31 -54.487 1.50 1.84666 23.9
32 51.278 1.62
33 * 80.176 4.48 1.85006 40.2
34 -227.700 (variable)
Image plane ∞

Aspheric data 6th surface
K = 0.00000e + 000 A 4 = 1.39226e-005 A 6 = -1.09653e-008 A 8 = -4.33385e-012 A10 = 5.30223e-014

22nd page
K = 0.00000e + 000 A 4 = -9.43667e-006 A 6 = -1.73083e-009 A 8 = 7.90583e-012 A10 = -1.65238e-014

27th page
K = 0.00000e + 000 A 4 = -4.95882e-006 A 6 = -4.53732e-009 A 8 = 3.85212e-011 A10 = -1.07546e-013

Side 33
K = 0.00000e + 000 A 4 = -7.62804e-006 A 6 = -7.21323e-009 A 8 = -2.06486e-012 A10 = -4.24052e-014

Various data Zoom ratio 2.75
Wide angle Medium Telephoto focal length 24.70 36.42 67.88
F number 2.91 2.91 2.91
Angle of View 41.22 30.71 17.68
Image height 21.64 21.64 21.64
Total lens length 164.87 172.85 196.79
BF 39.07 44.44 54.56

d 5 2.76 12.54 32.92
d15 14.94 7.78 1.22
d24 0.96 5.23 10.39
d27 11.37 7.10 1.94
d34 39.07 44.44 54.56

Zoom lens group data group Start surface Focal length
1 1 122.23
2 6 -15.38
3 16 26.71
4 25 -33.77
5 28 45.84

[Numerical Example 2]

Unit mm

Surface data surface number rd nd νd
1 1018.919 1.80 1.84666 23.9
2 84.890 8.21 1.83481 42.7
3 3143.890 0.15
4 59.262 5.79 1.83481 42.7
5 117.304 (variable)
6 * 98.182 0.05 1.52421 51.4
7 53.766 1.20 1.83481 42.7
8 16.625 7.87
9 -43.505 1.00 1.77250 49.6
10 17.574 4.72 1.83400 37.2
11 63.101 0.15
12 53.147 4.51 1.80518 25.4
13 -72.090 3.72
14 -20.873 1.20 1.77250 49.6
15 -33.228 (variable)
16 (Aperture) ∞ 0.49
17 31.905 4.45 1.49700 81.5
18 105.601 0.15
19 37.826 1.60 1.84666 23.9
20 23.210 10.83 1.49700 81.5
21 -68.228 0.15
22 * 71.333 4.07 1.69680 55.5
23 -148.072 (variable)
24 -269.960 5.65 1.84666 23.9
25 -19.352 1.20 1.83400 37.2
26 97.049 3.33
27 -92.477 1.30 1.83400 37.2
28 242.849 (variable)
29 115.000 6.08 1.49700 81.5
30 -44.176 0.15
31 90.778 6.19 1.49700 81.5
32 -55.146 0.00
33 -55.146 2.00 1.84666 23.9
34 * 169.829 0.96
35 329.543 3.81 1.77250 49.6
36 -87.758 (variable)
Image plane ∞

Aspheric data 6th surface
K = 0.00000e + 000 A 4 = 1.47329e-005 A 6 = -5.50082e-009 A 8 = -3.25716e-011 A10 = 1.59003e-013

22nd page
K = 0.00000e + 000 A 4 = -8.23158e-006 A 6 = -6.80915e-009 A 8 = 1.43495e-012 A10 = -3.20158e-014

34th page
K = 0.00000e + 000 A 4 = 3.77114e-006 A 6 = -7.83814e-010 A 8 = 3.91683e-012 A10 = -4.01873e-015

Various data Zoom ratio 2.76
Wide angle Medium Telephoto focal length 24.70 34.88 68.18
F number 2.91 2.91 2.91
Angle of View 41.22 31.81 17.61
Image height 21.64 21.64 21.64
Total lens length 165.79 174.26 199.67
BF 38.47 42.81 58.00

d 5 3.03 14.26 33.80
d15 17.78 10.67 1.36
d23 1.96 6.12 12.86
d28 11.79 7.63 0.89
d36 38.47 42.81 58.00

Zoom lens group data group Start surface Focal length
1 1 129.97
2 6 -17.09
3 16 28.36
4 24 -41.20
5 29 49.69

[Numerical Example 3]

Unit mm

Surface data surface number rd nd νd
1 371.811 2.00 1.84666 23.9
2 75.128 9.81 1.83481 42.7
3 1977.368 0.15
4 56.364 5.52 1.83481 42.7
5 96.407 (variable)
6 * 111.475 0.05 1.52421 51.4
7 61.920 1.50 1.88300 40.8
8 16.594 8.08
9 -38.790 1.20 1.77250 49.6
10 18.778 5.47 1.83400 37.2
11 740.429 0.15
12 89.499 3.52 1.80518 25.4
13 -81.521 3.18
14 -22.389 1.20 1.61800 63.3
15 -52.289 (variable)
16 (Aperture) ∞ 0.49
17 29.528 4.57 1.49700 81.5
18 104.655 0.15
19 31.270 1.60 1.83400 37.2
20 18.877 12.55 1.49700 81.5
21 -108.113 0.15
22 * 58.016 6.59 1.72916 54.7
23 -37.356 1.50 1.83400 37.2
24 -80.142 (variable)
25 -113.873 4.06 1.80809 22.8
26 -22.801 1.20 1.83481 42.7
27 * 47.494 (variable)
28 67.541 5.07 1.59240 68.3
29 -38.417 0.15
30 -106.637 3.42 1.49700 81.5
31 -30.155 1.50 1.84666 23.9
32 206.883 4.03
33 * 135.112 2.87 1.85006 40.2
34 -105.539 (variable)
Image plane ∞

Aspheric data 6th surface
K = 0.00000e + 000 A 4 = 1.53494e-005 A 6 = -5.20845e-009 A 8 = -4.15827e-011 A10 = 1.50211e-013

22nd page
K = 0.00000e + 000 A 4 = -1.09937e-005 A 6 = -2.18767e-009 A 8 = -1.23509e-011 A10 = 3.51553e-014

27th page
K = 0.00000e + 000 A 4 = -4.73774e-006 A 6 = 1.89462e-009 A 8 = -3.41239e-011 A10 = 1.42519e-013

Side 33
K = 0.00000e + 000 A 4 = -4.73629e-006 A 6 = -2.17487e-009 A 8 = 9.92522e-012 A10 = -2.20403e-014

Various data Zoom ratio 3.22
Wide angle Medium Telephoto focal length 24.70 39.67 79.43
F number 2.91 2.91 2.91
Angle of View 41.22 28.61 15.24
Image height 21.64 21.64 21.64
Total lens length 161.98 171.74 200.99
BF 38.35 46.17 57.64

d 5 2.51 14.41 39.54
d15 17.72 7.77 0.41
d24 1.02 5.87 10.52
d27 10.64 5.79 1.14
d34 38.35 46.17 57.64

Zoom lens group data group Start surface Focal length
1 1 122.04
2 6 -15.92
3 16 26.21
4 25 -38.11
5 28 57.05

L1: First lens group L2: Second lens group L3: Third lens group L4: Fourth lens group L5: Fifth lens group SP: Aperture stop IP: Image plane d: d line g: g line c: c line ΔM: Meridional image plane ΔS: Sagittal image plane

Claims (7)

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 fourth lens group having a negative refractive power. And a zoom lens having a fifth lens unit having a positive refractive power and in which the distance between the lens units changes during zooming,
The fourth lens group includes a lens unit IS having a negative refractive power that moves the imaging position in a direction perpendicular to the optical axis by moving in a direction having a component perpendicular to the optical axis. When the focal length of one lens unit is f1, and the focal length of the third lens unit is f3, 4.3 <f1 / f3 <6.0
A zoom lens satisfying the following conditional expression: When the focal length of the lens group IS is fIS and the focal length of the entire system at the telephoto end is ft,
0.3 <| fIS / ft | <1.5
The zoom lens according to claim 1, wherein the following conditional expression is satisfied. When the focal length of the second lens group is f2, and the focal length of the entire system at the telephoto end is ft,
0.15 <| f2 / ft | <0.40
The zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied.   During zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group increases, the distance between the second lens group and the third lens group decreases, and the third lens group 4. The lens unit according to claim 1, wherein the distance between the fourth lens group is increased and the distance between the fourth lens group and the fifth lens group is decreased. 5. Zoom lens.   5. The zoom lens according to claim 1, wherein the lens group IS includes a cemented lens in which a positive lens and a negative lens are cemented.   The zoom lens according to claim 1, wherein an image is formed on a solid-state imaging device.   An image pickup apparatus comprising: the zoom lens according to claim 1; and a solid-state image pickup device that receives an image formed by the zoom lens.