JP5333625B2 - Zoom lens, optical device, and zoom lens manufacturing method - Google Patents

Description

  The present invention relates to a zoom lens, an optical device, and a method for manufacturing a zoom lens.

  Conventionally, zoom lenses used for electronic still cameras and the like have been proposed (see, for example, Patent Document 1).

JP 2006-221092 A

However, in the conventional zoom lens, since the focusing lens and the anti-vibration lens are located in different lens groups, each driving mechanism must be arranged separately, which is not suitable for downsizing the lens. There was a problem of being.
Therefore, the present invention has been made in view of the above problems, and a zoom lens having a small and high imaging performance, in which a focusing lens and an anti-vibration lens are arranged in the same lens group, It is an object of the present invention to provide an optical device having a zoom lens and a zoom lens manufacturing method.

In order to solve the above problems, the present invention
In order from the object side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and the third lens group having a positive refractive power are substantially three lens groups. Consists of
The distance between the lens groups changes upon zooming,
The third lens group includes, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, a third partial group having a negative refractive power, and a positive A fourth subgroup having refractive power,
The first partial group performs a focusing operation by moving in the optical axis direction,
Correcting the image blur by moving the third sub-group to include a component in a direction perpendicular to the optical axis;
Provided is a zoom lens that satisfies the following conditional expression.
0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum movement amount of the third lens group

The present invention also provides
An optical apparatus comprising the zoom lens is provided.
The present invention also provides
In order from the object side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and the third lens group having a positive refractive power are substantially three lens groups. A zoom lens manufacturing method comprising:
The third lens group includes, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, a third partial group having a negative refractive power, and a positive A fourth subgroup having refractive power,
The distance between the lens groups changes upon zooming,
The first partial group moves in the optical axis direction to perform a focusing operation,
The third partial group is corrected so as to correct image blur by moving so as to include a component in a direction perpendicular to the optical axis.
A zoom lens manufacturing method is provided that satisfies the following conditional expression.
0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum movement amount of the third lens group

  According to the present invention, a zoom lens having a focusing lens and an anti-vibration lens arranged in the same lens group and having a small and high imaging performance, an optical device having the zoom lens, and a method for manufacturing the zoom lens Can be provided.

It is sectional drawing which shows the structure of the zoom lens which concerns on 1st Example of this application. (A), (b), and (c) are various aberration diagrams during focusing on an object at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 1 of the present application, respectively. It is. (A), (b), and (c) are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 1 of the present application, respectively. It is. (A) and (b) are lateral aberration diagrams when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 1 of the present application, respectively. It is sectional drawing which shows the structure of the zoom lens which concerns on 2nd Example of this application. (A), (b), and (c) are various aberration diagrams when focusing on an object at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 2 of the present application, respectively. It is. (A), (b), and (c) are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 2 of the present application, respectively. It is. (A) and (b) are lateral aberration diagrams when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 2 of the present application, respectively. It is sectional drawing which shows the structure of the zoom lens which concerns on 3rd Example of this application. (A), (b), and (c) are graphs showing various aberrations during focusing on an object at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 3 of the present application, respectively. It is. (A), (b), and (c) are graphs showing various aberrations when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 3 of the present application, respectively. It is. (A) and (b) are lateral aberration diagrams when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to the third example of the present application, respectively. It is sectional drawing which shows the structure of the zoom lens which concerns on 4th Example of this application. (A), (b), and (c) are various aberration diagrams during focusing on an object at infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 4 of the present application, respectively. It is. (A), (b), and (c) are various aberration diagrams when focusing on a short-distance object in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 4 of the present application, respectively. It is. (A) and (b) are lateral aberration diagrams when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 4 of the present application, respectively. (A) And (b) is the front view and back view of an electronic camera provided with the zoom lens of this application, respectively. It is A-A 'sectional drawing of Fig.17 (a). It is a figure which shows the outline of the manufacturing method of the zoom lens of this application.

Hereinafter, the zoom lens, the optical device, and the manufacturing method of the zoom lens of the present application will be described.
The zoom lens of the present application includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, The distance between the lens groups changes upon zooming, and the third lens group includes, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, and a negative A third partial group having a refractive power of 4 and a fourth partial group having a positive refractive power, and the first partial group moves in the optical axis direction to perform a focusing operation, and the third part Image blur is corrected by moving the group so as to include a component in a direction perpendicular to the optical axis, and the following conditional expression (1) is satisfied.
(1) 0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum movement amount of the third lens group

  As described above, the zoom lens according to the present application includes, in order from the object side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and the third lens group having a positive refractive power. And the distance between the lens groups changes upon zooming. Under this configuration, the first lens group functions as a first condenser lens group, the second lens group functions as a variable power lens group, and the third lens group functions as an imaging lens group. Also, in terms of aberration correction, the first lens group and the second lens group greatly change the incident height and the incident angle of the light beam at the time of zooming. To do. Since the third lens group has little change in the incident height and angle of incidence of light upon zooming, it contributes little to variations in various aberrations during zooming.

In the zoom lens of the present application, a long space in the optical axis direction can be secured in the third lens group. Thereby, the focusing lens and the vibration-proof lens can be arranged in the third lens group, that is, in one lens group.
In addition, the first partial group in the third lens group has less aberration fluctuation due to the in-focus movement. For this reason, it is set as the structure which performs a focusing operation | movement by moving a 1st partial group to an optical axis direction as mentioned above.
Further, the third partial group in the third lens group has a small outer diameter, and is suitable for efficiently arranging a vibration-proof drive mechanism on the outer periphery thereof. For this reason, as described above, the third partial group is moved so as to include a component in a direction perpendicular to the optical axis, thereby correcting image blur, that is, performing image stabilization.

The zoom lens according to the present application is configured to satisfy the conditional expression (1).
Conditional expression (1) is the product of the focal length when focusing on an object at infinity in the telephoto end state of the entire zoom lens system and the focal length when focusing on an object at infinity in the wide-angle end state, and the focal point of the third lens group. The ratio of the product of the distance and the maximum movement amount of the third lens group is defined. The maximum movement amount of the third lens group is the maximum movement amount of the third lens group that moves in the optical axis direction upon zooming. The zoom lens of the present application can satisfactorily correct various aberrations such as spherical aberration during focusing by satisfying conditional expression (1).
When the corresponding value of the conditional expression (1) of the zoom lens of the present application is less than the lower limit value, the third lens group moves greatly during zooming in order to increase the magnification. For this reason, it is not preferable because the spherical aberration is excessively corrected in the telephoto end state. In addition, the effect of this application can be made more reliable by making the lower limit of conditional expression (1) into 4.000. Moreover, the effect of the present application can be further ensured by setting the lower limit value of conditional expression (1) to 6.000. Moreover, the effect of the present application can be further ensured by setting the lower limit of conditional expression (1) to 8.000.

On the other hand, when the corresponding value of conditional expression (1) of the zoom lens of the present application exceeds the upper limit value, the refractive power of each partial group in the third lens group increases, and in particular, the refractive power of the second partial group increases. For this reason, since the fluctuation | variation of the spherical aberration by focusing becomes large, it is not preferable. In addition, the effect of this application can be made more reliable by making the upper limit of conditional expression (1) into 13.000. In addition, by setting the upper limit value of conditional expression (1) to 12.500, the effect of the present application can be further ensured. Further, by setting the upper limit value of conditional expression (1) to 12.000, the effect of the present application can be further ensured.
With the above configuration, it is possible to realize a compact zoom lens having a high imaging performance by disposing the focusing lens and the anti-vibration lens in the same lens group.

Further, in the zoom lens of the present application, it is advantageous for noise reduction that the movement amount of the image plane when the first lens group is moved in the optical axis direction is small. In addition, since the refractive power of the third lens group becomes small, the decentering sensitivity also becomes low, which is advantageous in manufacturing. Therefore, in the zoom lens of the present application, the following conditional expression (2) is satisfied in order to suppress aberration fluctuation due to focusing and reduce the amount of movement of the image plane when the focusing lens is moved in the optical axis direction. It is desirable to be satisfied.
(2) 0.165 <F3 / Ft <0.250
However,
F3: focal length of the third lens group Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state

Conditional expression (2) defines the ratio between the focal length of the third lens group and the focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state. The zoom lens of the present application can satisfactorily correct spherical aberration during focusing by satisfying conditional expression (2).
When the corresponding value of conditional expression (2) of the zoom lens of the present application is below the lower limit value, the refractive power of each partial group in the third lens group increases, and in particular, the refractive power of the second partial group increases. For this reason, since the fluctuation | variation of the spherical aberration by focusing becomes large, it is not preferable.
On the other hand, when the corresponding value of the conditional expression (2) of the zoom lens of the present application exceeds the upper limit value, the third lens group moves greatly during zooming in order to increase the magnification. For this reason, it is not preferable because the spherical aberration is excessively corrected in the telephoto end state.

It is desirable that the zoom lens of the present application satisfies the following conditional expression (3).
(3) 0.45 <F1 / Ft <0.70
However,
F1: Focal length of the first lens group Ft: Focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state

Conditional expression (3) defines the ratio between the focal length of the first lens unit and the focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state. The zoom lens of the present application can satisfactorily correct various aberrations such as field curvature by satisfying conditional expression (3).
When the corresponding value of conditional expression (3) of the zoom lens of the present application is less than the lower limit value, the amount of movement of the first lens unit during zooming from the wide-angle end state to the telephoto end state increases. For this reason, the change in the magnification of the third lens group is increased, and this particularly affects various aberrations such as field curvature during image stabilization.
On the other hand, if the corresponding value of conditional expression (3) of the zoom lens of the present application exceeds the upper limit value, the amount of movement of the third lens unit at the time of zooming increases, and various aberrations such as field curvature increase. It is not preferable.

In the zoom lens according to the present application, it is preferable that the fourth partial group has at least one positive lens component and at least two negative lens components. With this configuration, the zoom lens of the present application can realize better optical performance.
In the zoom lens according to the present application, it is preferable that the fourth partial group includes at least two positive lens components and at least one negative lens component. With this configuration, the zoom lens of the present application can realize better optical performance.
The optical device according to the present application includes the zoom lens having the above-described configuration. As a result, it is possible to realize a small optical device having a high imaging performance by disposing the focusing lens and the anti-vibration lens in the same lens group.

The zoom lens manufacturing method of the present application includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power. The third lens group includes, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, and a negative refractive power. And a fourth partial group having a positive refractive power so that the distance between the lens groups changes upon zooming, and the first partial group moves in the optical axis direction. Thus, the focusing operation is performed, the image blur is corrected by moving the third partial group so as to include a component in the direction perpendicular to the optical axis, and the following conditional expression (1) It is characterized by satisfying. Thereby, a focusing lens and a vibration-proof lens are arranged in the same lens group, and a zoom lens having a small size and high imaging performance can be manufactured.
(1) 0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum movement amount of the third lens group

Hereinafter, zoom lenses according to numerical examples of the present application will be described with reference to the accompanying drawings.
(First embodiment)
FIG. 1 is a cross-sectional view showing the configuration of a zoom lens according to Example 1 of the present application, and shows a state at the time of focusing on an object at infinity in the wide-angle end state.
The zoom lens according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group having a positive refractive power. G3.
The first lens group G1 includes, in order from the object side, a positive meniscus lens L11 having a convex surface facing the object side, and a cemented lens of a negative meniscus lens L12 having a convex surface facing the object side and a biconvex positive lens L13. Become.
The second lens group G2 includes, in order from the object side, a cemented lens of a biconcave negative lens L21, a biconcave negative lens L22, and a positive meniscus lens L23 having a convex surface facing the object, and a concave surface on the object side. And a negative meniscus lens L24 facing the lens.

The third lens group G3 includes, in order from the object side, an aperture stop S, a first partial group B1 having a positive refractive power, a second partial group B2 having a positive refractive power, and a first partial group B2 having a negative refractive power. It consists of three partial groups B3 and a fourth partial group B4 having positive refractive power.
The first partial group B1 includes only a biconvex positive lens L31.
The second partial group B2 includes, in order from the object side, a cemented lens of a biconvex positive lens L32 and a negative meniscus lens L33 having a concave surface facing the object side, a positive meniscus lens L34 having a convex surface facing the object side, It consists of a cemented lens of a biconcave negative lens L35 and a biconvex positive lens L36.
The third partial group B3 includes, in order from the object side, only a cemented lens of a positive meniscus lens L37 having a concave surface directed toward the object side and a biconcave negative lens L38.
The fourth partial group B4 includes, in order from the object side, a biconvex positive lens L39, a positive meniscus lens L310 having a convex surface facing the object side, and a negative meniscus lens L311 having a concave surface facing the object side.
A filter group FL is arranged in the vicinity of the image plane I. The filter group FL includes, in order from the object side, a dustproof glass, an optical low-pass filter, and a cover glass of a solid-state image sensor.

In the zoom lens according to the present embodiment, the distance between the first lens group G1 and the second lens group G2 changes, and the distance between the second lens group G2 and the third lens group G3 changes. When the group G1 moves to the object side, the second lens group G2 once moves to the image side, then moves to the object side, and the third lens group G3 moves to the object side, the wide-angle end state to the telephoto end state Perform scaling to.
In the zoom lens according to the present embodiment, the first partial group B1 in the third lens group G3 moves in the optical axis direction, thereby focusing from an object at infinity to a near object.

The zoom lens according to the present embodiment corrects image blur by moving the third partial group B3 in the third lens group G3 so as to include a component in a direction perpendicular to the optical axis, that is, image stabilization. I do.
Here, in a lens in which the focal length of the entire lens system is f and the image stabilization coefficient (ratio of the image movement amount on the image plane I to the movement amount of the image stabilization lens group during image stabilization) is K, the angle θ In order to correct the rotational blur of the lens, the anti-vibration lens group may be moved in a direction orthogonal to the optical axis by (f · tan θ) / K. Therefore, the zoom lens according to the present example has the vibration proof coefficient of 1.287 and the focal length of 30.00007 (mm) in the wide-angle end state, and thus the third lens for correcting the rotational shake of 0.30 °. The movement amount of the subgroup B3 is 0.122 (mm). Further, in the telephoto end state, since the image stabilization coefficient is 1.918 and the focal length is 107.00006 (mm), the amount of movement of the third subgroup B3 for correcting the rotation blur of 0.30 ° is 0. 292 (mm).
The diagonal length from the center of the solid-state imaging device of the zoom lens according to the present embodiment to the diagonal is 8.5 mm.

Table 1 below lists values of specifications of the zoom lens according to the present example.
In Table 1, f is the focal length, FNO is the F number, SUM.D is the length from the lens surface closest to the object side of the zoom lens to the lens surface closest to the image side, TL is the total length of the zoom lens (most object side) Bf represents the length from the lens surface closest to the image side to the image plane I, respectively. W represents the wide-angle end state, M represents the intermediate focal length state, and T represents the telephoto end state.
In [Surface Data], the surface number is the order of the optical surfaces counted from the object side, r is the radius of curvature, d is the surface spacing on the optical axis, nd is the refractive index with respect to the d-line (wavelength λ = 587.6 nm), ng Is the refractive index for g-line (wavelength λ = 435.8 nm), nC is the refractive index for C-line (wavelength λ = 656.3 nm), and nF is the refractive index for F-line (wavelength λ = 486.1 nm). Yes. Further, the object plane indicates the object plane, (S) indicates the aperture stop S, and the image plane indicates the image plane I. Note that the radius of curvature r = ∞ indicates a plane, and the refractive index of air is not shown.
Here, “mm” is generally used as a unit of the focal length f, the radius of curvature r, and other lengths listed in Table 1. However, the optical system is not limited to this because an equivalent optical performance can be obtained even when proportionally enlarged or proportionally reduced. In addition, the code | symbol of Table 1 described above shall be similarly used also in the table | surface of each Example mentioned later.

(Table 1) First Example
[Surface data]
Surface number r d nd ng nC nF
Object ∞
1) 54.41704 2.30000 1.516800 1.526700 1.514320 1.522380
2) 342.62842 0.10000
3) 49.86783 1.10000 1.795040 1.831540 1.787030 1.814740
4) 29.95421 3.80000 1.497820 1.505260 1.495980 1.502010
5) -207.88291 (d5)

6) -73.16056 1.00000 1.487490 1.495930 1.485350 1.492270
7) 27.55570 2.10000
8) -67.04858 1.00000 1.795000 1.817120 1.789740 1.807290
9) 17.77528 2.30000 1.846660 1.894190 1.836490 1.872100
10) 2247.19750 1.00000
11) -23.40360 1.00000 1.658440 1.674690 1.654550 1.667490
12) -125.17500 (d12)

13) (S) ∞ (d13)
14) 66.27637 2.60000 1.487490 1.495930 1.485350 1.492270
15) -29.47900 (d15)
16) 27.79036 3.70000 1.497820 1.505260 1.495980 1.502010
17) -21.03415 1.00000 1.850260 1.884500 1.842600 1.868880
18) -116.85644 0.10000
19) 18.42576 2.80000 1.618000 1.630100 1.615040 1.624790
20) 399.05207 2.06863
21) -49.18829 1.00000 1.850260 1.884500 1.842600 1.868880
22) 19.62577 3.30000 1.592700 1.614540 1.587790 1.604580
23) -24.63603 5.68926
24) -4591.93900 1.70000 1.846660 1.894190 1.836490 1.872100
25) -15.74005 0.95000 1.806100 1.831150 1.800250 1.819940
26) 16.84314 2.50001
27) 150.45862 1.50000 1.487490 1.495930 1.485350 1.492270
28) -85.38036 0.39186
29) 19.84256 1.80000 1.589130 1.601030 1.586190 1.595820
30) 319.23265 2.74664
31) -12.42116 1.00000 1.734000 1.751750 1.729690 1.743940
32) -26.23494 (d32)

33) ∞ 0.50000 1.516800 1.526700 1.514320 1.522380
34) ∞ 1.11000
35) ∞ 1.59000 1.516800 1.526700 1.514320 1.522380
36) ∞ 0.30000
37) ∞ 0.70000 1.516800 1.526700 1.514320 1.522380
38) ∞ 0.71827
Image plane ∞

[Various data]
Scaling ratio 3.57

W M T
f 30.00007 60.00020 107.00069
FNO 3.803 4.497 5.767

<Interval data when focusing on an object at infinity>
W M T
d5 3.00535 15.04519 19.49644
d12 17.00519 8.43138 1.19999
d13 1.97000 1.97000 1.97000
d15 4.47307 4.47307 4.47307
d32 10.09999 16.36860 27.90584
SUM.D 77.00001 80.46604 77.6859
TL 92.01827 101.75292 110.51003
TL 91.06766 100.80230 109.55940
Bf 15.01825 21.28687 32.82411
Air conversion Bf 14.06765 20.33627 31.87350

<Interval data when focusing on a short-distance object>
W M T
d5 3.00535 15.04519 19.49644
d12 17.00519 8.43138 1.19999
d13 2.84958 3.91471 5.28708
d15 3.59349 2.52836 1.15599
d32 10.09999 16.36860 27.90584
SUM.D 77.00001 80.46604 77.6859
TL 92.01827 101.75292 110.51003

<Moving amount of anti-vibration lens and moving amount of image plane I during image stabilization>
f, β 30.00000 60.00000 107.00000 -0.03156 -0.06044 -0.10444
Lens ± 0.122 ± 0.211 ± 0.292 ± 0.122 ± 0.211 ± 0.292
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

[Conditional expression values]
(1) (Ft × Fw) / (F3 × X3) = 9.277
(2) F3 / Ft = 0.182
(3) F1 / Ft = 0.57 3

2 (a), 2 (b), and 2 (c) respectively show the infinite object combination in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom lens according to Example 1 of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
3 (a), 3 (b), and 3 (c) respectively show short-distance object alignments in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 1 of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
4 (a) and 4 (b) are lateral aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 1 of the present application, respectively. FIG.

In each aberration diagram, FNO represents an F number, Y represents an image height, and A represents a half angle of view (unit: “°”). d represents the aberration at the d-line (λ = 587.6 nm), and g represents the aberration at the g-line (λ = 435.8 nm). In the astigmatism diagram, the solid line indicates the sagittal image plane, and the broken line indicates the meridional image plane. The lateral chromatic aberration diagram is shown with reference to the d-line. Note that the same reference numerals as in this embodiment are used in the aberration diagrams of each embodiment described later.
From each aberration diagram, the zoom lens according to the present embodiment has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state, and also has excellent imaging performance during image stabilization. It can be seen that

(Second embodiment)
FIG. 5 is a sectional view showing the structure of a zoom lens according to Example 2 of the present application, and shows a state at the time of focusing on an object at infinity in the wide-angle end state.
The zoom lens according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group having a positive refractive power. G3.
The first lens group G1 includes, in order from the object side, a biconvex positive lens L11, and a cemented lens of a negative meniscus lens L12 having a convex surface facing the object side and a biconvex positive lens L13.
The second lens group G2, in order from the object side, is a biconcave negative lens L21, a cemented lens of a biconcave negative lens L22 and a positive meniscus lens L23 having a convex surface facing the object, and a biconcave lens. And a negative lens L24.

The third lens group G3 includes, in order from the object side, an aperture stop S, a first partial group B1 having a positive refractive power, a second partial group B2 having a positive refractive power, and a first partial group B2 having a negative refractive power. It consists of three partial groups B3 and a fourth partial group B4 having positive refractive power.
The first partial group B1 includes only a biconvex positive lens L31.
The second partial group B2 includes, in order from the object side, a cemented lens of a biconvex positive lens L32 and a negative meniscus lens L33 having a concave surface facing the object side, a positive meniscus lens L34 having a convex surface facing the object side, It consists of a cemented lens of a biconcave negative lens L35 and a biconvex positive lens L36.
The third partial group B3 includes, in order from the object side, only a cemented lens of a positive meniscus lens L37 having a concave surface directed toward the object side and a biconcave negative lens L38.
The fourth partial group B4 includes, in order from the object side, a biconvex positive lens L39, a positive meniscus lens L310 having a convex surface facing the object side, and a negative meniscus lens L311 having a concave surface facing the object side.
A filter group FL is arranged in the vicinity of the image plane I. The filter group FL includes, in order from the object side, a dustproof glass, an optical low-pass filter, and a cover glass of a solid-state image sensor.

In the zoom lens according to the present embodiment, the distance between the first lens group G1 and the second lens group G2 changes, and the distance between the second lens group G2 and the third lens group G3 changes. When the group G1 moves to the object side, the second lens group G2 once moves to the image side, then moves to the object side, and the third lens group G3 moves to the object side, the wide-angle end state to the telephoto end state Perform scaling to.
In the zoom lens according to the present embodiment, the first partial group B1 in the third lens group G3 moves in the optical axis direction, thereby focusing from an object at infinity to a near object.

The zoom lens according to the present embodiment performs image stabilization by moving the third partial group B3 in the third lens group G3 so as to include a component in a direction perpendicular to the optical axis.
In the zoom lens according to the present example, the image stabilization coefficient is 1.227 and the focal length is 30.00000 (mm) in the wide-angle end state. Therefore, the third subgroup for correcting the rotation blur of 0.30 °. The amount of movement of B3 is 0.128 (mm). In the telephoto end state, since the image stabilization coefficient is 1.848 and the focal length is 107.00000 (mm), the movement amount of the third subgroup B3 for correcting the rotation blur of 0.30 ° is 0. .303 (mm).
The diagonal length from the center of the solid-state imaging device of the zoom lens according to the present embodiment to the diagonal is 8.5 mm.
Table 2 below lists values of specifications of the zoom lens according to the present example.

(Table 2) Second Example
[Surface data]
Surface number r d nd ng nC nF
Object ∞
1) 500.00000 2.00000 1.487490 1.495932 1.485345 1.492269
2) -108.88895 0.10000
3) 36.38273 1.10000 1.795041 1.831539 1.787031 1.814744
4) 25.21266 3.85000 1.497820 1.505265 1.495980 1.502013
5) -449.99814 (d5)

6) -500.00000 1.00000 1.487490 1.495932 1.485345 1.492269
7) 35.34774 2.00000
8) -46.60240 1.00000 1.799520 1.823514 1.793875 1.812802
9) 13.66861 2.45000 1.846660 1.894191 1.836491 1.872100
10) 158.14521 1.10000
11) -27.07066 1.00000 1.658441 1.674690 1.654554 1.667493
12) 499.99945 (d12)

13) (S) ∞ (d13)
14) 55.79579 2.40000 1.487490 1.495932 1.485345 1.492269
15) -33.25134 (d15)
16) 21.71059 4.00000 1.497820 1.505265 1.495980 1.502013
17) -21.71059 1.00000 1.850260 1.884499 1.842595 1.868880
18) -97.96206 0.10000
19) 18.40545 2.30000 1.618000 1.630099 1.615035 1.624787
20) 52.05846 1.50000
21) -63.74832 1.00000 1.850260 1.884499 1.842595 1.868880
22) 26.46966 2.70000 1.581439 1.599729 1.577215 1.591488
23) -26.46969 5.99500
24) -262.52644 1.85000 1.846660 1.894191 1.836491 1.872100
25) -14.33840 0.95000 1.806100 1.831152 1.800252 1.819941
26) 17.14965 2.50000
27) 41.29359 1.60000 1.518229 1.529148 1.515554 1.524348
28) -70.80392 0.20000
29) 21.69467 1.60000 1.579570 1.593079 1.576319 1.587110
30) 105.00000 2.14810
31) -11.91820 1.00000 1.754999 1.772958 1.750625 1.765057
32) -24.46893 (d32)

33) ∞ 0.50000 1.516800 1.526703 1.514322 1.522384
34) ∞ 1.11000
35) ∞ 1.59000 1.516800 1.526703 1.514322 1.522384
36) ∞ 0.30000
37) ∞ 0.70000 1.516800 1.526703 1.514322 1.522384
38) ∞ 0.70001
Image plane ∞

[Various data]
Scaling ratio 3.57

W M T
f 30.00000 59.99957 106.99860
FNO 4.124 4.262 4.691

<Interval data when focusing on an object at infinity>
W M T
d5 1.69000 15.31650 20.58520
d12 16.91000 9.30253 2.01355
d13 1.97000 1.97000 1.97000
d15 4.59151 4.59151 4.59151
d32 12.79420 17.82727 27.29623
SUM.D 90.59880 96.61783 94.59755
TL 91.29881 102.34951 109.79730
Air equivalent TL 90.34923 101.4003 108.84900
Bf 17.69522 22.72728 32.19624
Air conversion Bf 16.74462 21.77668 31.24564

<Interval data when focusing on a short-distance object>
W M T
d5 1.69000 15.31650 20.58520
d12 16.91000 9.30253 2.01355
d13 2.69150 3.80674 5.00151
d15 3.87001 2.75477 1.56000
d32 12.79420 17.82727 27.29623
SUM.D 73.60061 79.62364 77.60336
TL 91.29881 102.34951 109.79730

<Moving amount of anti-vibration lens and moving amount of image plane I during image stabilization>
f, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.128 ± 0.221 ± 0.303 ± 0.128 ± 0.221 ± 0.303
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

[Conditional expression values]
(1) (Ft × Fw) / (F3 × X3) = 11.395
(2) F3 / Ft = 0.182
(3) F1 / Ft = 0.55 9

6 (a), 6 (b), and 6 (c) respectively show the infinite object combination in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom lens according to the second embodiment of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
FIGS. 7 (a), 7 (b), and 7 (c) respectively show short-distance object alignments in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 2 of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
FIGS. 8A and 8B are lateral aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to the second embodiment of the present application, respectively. FIG.
From each aberration diagram, the zoom lens according to the present embodiment has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state, and also has excellent imaging performance during image stabilization. It can be seen that

(Third embodiment)
FIG. 9 is a sectional view showing the structure of a zoom lens according to Example 3 of the present application, and shows a state at the time of focusing on an object at infinity in the wide-angle end state.
The zoom lens according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group having a positive refractive power. G3.
The first lens group G1 includes, in order from the object side, a biconvex positive lens L11, and a cemented lens of a negative meniscus lens L12 having a convex surface facing the object side and a biconvex positive lens L13.
The second lens group G2, in order from the object side, is a biconcave negative lens L21, a cemented lens of a biconcave negative lens L22 and a positive meniscus lens L23 having a convex surface facing the object, and a biconcave lens. And a negative lens L24.

The third lens group G3 includes, in order from the object side, an aperture stop S, a first partial group B1 having a positive refractive power, a second partial group B2 having a positive refractive power, and a first partial group B2 having a negative refractive power. It consists of three partial groups B3 and a fourth partial group B4 having positive refractive power.
The first partial group B1 includes only a biconvex positive lens L31.
The second partial group B2 includes, in order from the object side, a cemented lens of a biconvex positive lens L32 and a negative meniscus lens L33 having a concave surface facing the object side, a positive meniscus lens L34 having a convex surface facing the object side, It consists of a cemented lens of a biconcave negative lens L35 and a biconvex positive lens L36.
The third partial group B3 includes, in order from the object side, only a cemented lens of a positive meniscus lens L37 having a concave surface directed toward the object side and a biconcave negative lens L38.
The fourth partial group B4 includes, in order from the object side, a biconvex positive lens L39, a positive meniscus lens L310 having a convex surface facing the object side, and a negative meniscus lens L311 having a concave surface facing the object side.
A filter group FL is arranged in the vicinity of the image plane I. The filter group FL includes, in order from the object side, a dustproof glass, an optical low-pass filter, and a cover glass of a solid-state image sensor.

In the zoom lens according to the present embodiment, the distance between the first lens group G1 and the second lens group G2 changes, and the distance between the second lens group G2 and the third lens group G3 changes. When the group G1 moves to the object side, the second lens group G2 once moves to the image side, then moves to the object side, and the third lens group G3 moves to the object side, the wide-angle end state to the telephoto end state Perform scaling to.
In the zoom lens according to the present embodiment, the first partial group B1 in the third lens group G3 moves in the optical axis direction, thereby focusing from an object at infinity to a near object.

The zoom lens according to the present embodiment performs image stabilization by moving the third partial group B3 in the third lens group G3 so as to include a component in a direction perpendicular to the optical axis.
Since the zoom lens according to the present example has an anti-vibration coefficient of 1.256 and a focal length of 30.00000 (mm) in the wide-angle end state, the third subgroup for correcting rotational shake of 0.30 °. The amount of movement of B3 is 0.125 (mm). Further, in the telephoto end state, the image stabilization coefficient is 1.867 and the focal length is 107.00000 (mm). Therefore, the movement amount of the third subgroup B3 for correcting the rotation blur of 0.30 ° is 0. 300 (mm).
The diagonal length from the center of the solid-state imaging device of the zoom lens according to the present embodiment to the diagonal is 8.5 mm.
Table 3 below provides values of specifications of the zoom lens according to the present example.

(Table 3) Third Example
[Surface data]
Surface number r d nd ng nC nF
Object ∞
1) 57.27846 2.90000 1.487490 1.495944 1.485343 1.492276
2) -500.00000 0.10000
3) 49.66256 1.10000 1.795040 1.831551 1.787036 1.814745
4) 29.87819 4.10000 1.497820 1.505256 1.495980 1.502009
5) -500.00086 (d5)

6) -103.64515 1.00000 1.516800 1.526741 1.514315 1.522405
7) 41.82216 1.84258
8) -88.73332 1.00000 1.795000 1.817109 1.789742 1.807287
9) 14.34679 2.60000 1.846660 1.894197 1.836505 1.872084
10) 88.54415 1.09385
11) -24.07528 1.00000 1.612720 1.625706 1.609539 1.620006
12) 499.99839 (d12)

13) (S) ∞ (d13)
14) 77.09831 2.42127 1.487490 1.495944 1.485343 1.492276
15) -29.35673 (d15)
16) 22.30179 3.77498 1.497820 1.505256 1.495980 1.502009
17) -22.30179 1.10000 1.850260 1.884512 1.842602 1.868883
18) -187.60046 0.10000
19) 17.68001 2.67864 1.563840 1.575320 1.561006 1.570294
20) 500.00000 0.63386
21) -57.46079 1.00000 1.850260 1.884512 1.842602 1.868883
22) 30.53255 2.75582 1.603420 1.623865 1.598747 1.614615
23) -30.53256 5.91025
24) -500.00000 1.85000 1.846660 1.894197 1.836505 1.872084
25) -17.06821 0.95000 1.806100 1.831111 1.800248 1.819921
26) 17.06821 2.50000
27) 47.38910 1.65847 1.517420 1.529871 1.514429 1.524341
28) -79.04504 0.39084
29) 20.55261 1.99178 1.517420 1.529871 1.514429 1.524341
30) 78.08490 2.64819
31) -10.84436 1.10000 1.755000 1.772953 1.750628 1.765054
32) -20.44516 (d32)

33) ∞ 0.50000 1.516800 1.526741 1.514315 1.522405
34) ∞ 1.11000
35) ∞ 1.59000 1.516800 1.526741 1.514315 1.522405
36) ∞ 0.30000
37) ∞ 0.70000 1.516800 1.526741 1.514315 1.522405
38) ∞ 0.70003
Image plane ∞

[Various data]
Scaling ratio 3.57

W M T
f 30.00003 60.00007 107.00018
FNO 3.976 4.572 5.742

<Interval data when focusing on an object at infinity>
W M T
d5 1.69000 14.83163 19.60065
d12 16.67744 8.94307 1.86679
d13 1.97000 1.97000 1.97000
d15 4.55131 4.55131 4.55131
d32 11.30972 16.48945 26.71178
SUM.D 75.08928 80.49654 78.18928
TL 91.29903 101.88601 109.80106
Air equivalent TL 90.34843 100.9354 108.8505
Bf 16.20976 21.38948 31.61181
Air conversion Bf 15.25915 20.43888 30.66121

<Interval data when focusing on a short-distance object>
W M T
d5 1.69000 14.83163 19.60065
d12 16.67744 8.94307 1.86679
d13 2.73254 3.85681 4.96131
d15 3.78877 2.66450 1.56000
d32 11.30972 16.48945 26.71178
SUM.D 75.08928 80.49654 78.18928
TL 91.29903 101.88601 109.80106

<Moving amount of anti-vibration lens and moving amount of image plane I during image stabilization>
f, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.125 ± 0.213 ± 0.300 ± 0.125 ± 0.213 ± 0.300
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

[Conditional expression values]
(1) (Ft × Fw) / (F3 × X3) = 11.042
(2) F3 / Ft = 0.176
(3) F1 / Ft = 0.56 6

FIGS. 10 (a), 10 (b), and 10 (c) respectively show the infinite object combination in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the zoom lens according to Example 3 of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
FIGS. 11 (a), 11 (b), and 11 (c) respectively show short-distance objects in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to the third example of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
FIGS. 12 (a) and 12 (b) show lateral aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to the third example of the present application, respectively. FIG.
From each aberration diagram, the zoom lens according to the present embodiment has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state, and also has excellent imaging performance during image stabilization. It can be seen that

(Fourth embodiment)
FIG. 13 is a sectional view showing the structure of a zoom lens according to Example 4 of the present application, and shows a state at the time of focusing on an object at infinity in the wide-angle end state.
The zoom lens according to the present embodiment includes, in order from the object side, a first lens group G1 having a positive refractive power, a second lens group G2 having a negative refractive power, and a third lens group having a positive refractive power. G3.
The first lens group G1 includes, in order from the object side, a biconvex positive lens L11, and a cemented lens of a negative meniscus lens L12 having a convex surface facing the object side and a biconvex positive lens L13.
The second lens group G2, in order from the object side, is a biconcave negative lens L21, a cemented lens of a biconcave negative lens L22 and a positive meniscus lens L23 having a convex surface facing the object, and a biconcave lens. And a negative lens L24.

The third lens group G3 includes, in order from the object side, an aperture stop S, a first partial group B1 having a positive refractive power, a second partial group B2 having a positive refractive power, and a first partial group B2 having a negative refractive power. It consists of three partial groups B3 and a fourth partial group B4 having positive refractive power.
The first partial group B1 includes only a biconvex positive lens L31.
The second partial group B2 includes, in order from the object side, a cemented lens of a biconvex positive lens L32 and a negative meniscus lens L33 having a concave surface facing the object side, a positive meniscus lens L34 having a convex surface facing the object side, It consists of a cemented lens of a biconcave negative lens L35 and a biconvex positive lens L36.
The third partial group B3 includes, in order from the object side, only a cemented lens of a positive meniscus lens L37 having a concave surface directed toward the object side and a biconcave negative lens L38.
The fourth partial group B4 includes, in order from the object side, a cemented lens of a biconvex positive lens L39 and a negative meniscus lens L310 having a concave surface facing the object side, and a negative meniscus lens L311 having a concave surface facing the object side. Become.
A filter group FL is arranged in the vicinity of the image plane I. The filter group FL includes, in order from the object side, a dustproof glass, an optical low-pass filter, and a cover glass of a solid-state image sensor.

In the zoom lens according to the present embodiment, the distance between the first lens group G1 and the second lens group G2 changes, and the distance between the second lens group G2 and the third lens group G3 changes. After the group G1 moves to the object side, the second lens group G2 once moves to the object side, then moves to the image side, then further moves to the object side, and the third lens group G3 once moves to the image side By moving to the object side, zooming from the wide-angle end state to the telephoto end state is performed.
In the zoom lens according to the present embodiment, the first partial group B1 in the third lens group G3 moves in the optical axis direction, thereby focusing from an object at infinity to a near object.

The zoom lens according to the present embodiment performs image stabilization by moving the third partial group B3 in the third lens group G3 so as to include a component in a direction perpendicular to the optical axis.
In the zoom lens according to the present example, since the image stabilization coefficient is 1.266 and the focal length is 30.00000 (mm) in the wide-angle end state, the third subgroup for correcting the rotational shake of 0.30 °. The amount of movement of B3 is 0.124 (mm). Further, in the telephoto end state, since the image stabilization coefficient is 1.892 and the focal length is 107.00000 (mm), the movement amount of the third subgroup B3 for correcting the rotation blur of 0.30 ° is 0. .296 (mm).
The diagonal length from the center of the solid-state imaging device of the zoom lens according to the present embodiment to the diagonal is 8.5 mm.
Table 4 below lists values of specifications of the zoom lens according to the present example.

(Table 4) Fourth Example
[Surface data]
Surface number r d nd ng nC nF
Object ∞
1) 51.16724 2.92000 1.487490 1.495944 1.485343 1.492276
2) -520.00000 0.10000
3) 52.91480 1.10000 1.795040 1.831549 1.787036 1.814744
4) 29.50000 3.90000 1.497820 1.505256 1.495980 1.502009
5) -297.28610 (d5)

6) -90.00000 1.00000 1.516800 1.526741 1.514315 1.522405
7) 57.27273 1.85781
8) -82.14254 1.00000 1.622990 1.636276 1.619729 1.630448
9) 14.74805 2.60000 1.846660 1.894194 1.836505 1.872083
10) 59.21830 0.94287
11) -34.40925 1.00000 1.744000 1.765005 1.739042 1.755647
12) 54.96721 (d12)

13) (S) ∞ (d13)
14) 87.22992 2.40000 1.487490 1.495944 1.485343 1.492276
15) -27.61149 (d15)
16) 20.56591 3.85000 1.497820 1.505256 1.495980 1.502009
17) -20.56591 1.10000 1.850260 1.884510 1.842602 1.868882
18) 233.23326 0.10000
19) 20.44605 2.54000 1.700000 1.718349 1.695645 1.710196
20) 500.00000 0.39482
21) -70.40839 1.00000 1.834000 1.862765 1.827379 1.849807
22) 28.04409 2.74000 1.548140 1.563440 1.544550 1.556594
23) -28.04409 6.17670
24) -285.32383 1.85000 1.846660 1.894194 1.836505 1.872083
25) -17.47065 0.95000 1.766840 1.787447 1.761914 1.778307
26) 17.47065 2.05000
27) 22.79378 2.88000 1.700000 1.718349 1.695645 1.710196
28) -13.64921 1.20000 1.749500 1.777038 1.743271 1.764534
29) -55.38319 3.27314
30) -11.44807 1.00000 1.755000 1.772952 1.750628 1.765054
31) -23.75201 (d31)

32) ∞ 0.50000 1.516800 1.526741 1.514315 1.522405
33) ∞ 1.11000
34) ∞ 1.59000 1.516800 1.526741 1.514315 1.522405
35) ∞ 0.30000
36) ∞ 0.70000 1.516800 1.526741 1.514315 1.522405
37) ∞ 0.70051
Image plane ∞

[Various data]
Scaling ratio 3.57

W M T
f 30.00032 60.00068 107.00136
FNO 3.776 4.507 5.791

<Interval data when focusing on an object at infinity>
W M T
d5 2.50342 12.62584 16.46761
d12 19.44128 9.69110 1.84000
d13 1.97000 1.97000 1.97000
d15 4.66384 4.66384 4.66384
d31 10.96381 17.63977 29.42176
SUM.D 78.50388 78.87612 74.86679
TL 94.36822 101.41645 109.18914
Air equivalent TL 93.41759 100.46580 108.23850
Bf 15.86431 22.54028 34.32227
Air conversion Bf 14.91371 21.58968 33.37167

<Interval data when focusing on a short-distance object>
W M T
d5 2.50342 12.62584 16.46761
d12 19.44128 9.69110 1.84000
d13 3.0102 4.13015 5.07384
d15 3.62364 2.50369 1.56000
d31 10.96381 17.63977 29.42176
SUM.D 78.50388 78.87612 74.86679
TL 94.36822 101.41645 109.18914

<Moving amount of anti-vibration lens and moving amount of image plane I during image stabilization>
f, β 30.00000 60.00000 107.00000 -0.03154 -0.06033 -0.10411
Lens ± 0.124 ± 0.215 ± 0.296 ± 0.124 ± 0.215 ± 0.296
Image plane ± 0.157 ± 0.314 ± 0.560 ± 0.157 ± 0.314 ± 0.560

[Conditional expression values]
(1) (Ft × Fw) / (F3 × X3) = 10.401
(2) F3 / Ft = 0.187
(3) F1 / Ft = 0.55 0

FIGS. 14 (a), 14 (b), and 14 (c) respectively show infinite objects in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 4 of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
15 (a), 15 (b), and 15 (c) respectively show short-distance object alignments in the wide-angle end state, intermediate focal length state, and telephoto end state of the zoom lens according to Example 4 of the present application. FIG. 5 is a diagram showing various aberrations during focusing.
FIGS. 16 (a) and 16 (b) show lateral aberrations when the image stabilization is performed at the time of focusing on an object at infinity in the wide-angle end state and the telephoto end state of the zoom lens according to Example 4 of the present application, respectively. FIG.
From each aberration diagram, the zoom lens according to the present embodiment has excellent imaging performance by correcting various aberrations well from the wide-angle end state to the telephoto end state, and also has excellent imaging performance during image stabilization. It can be seen that

According to each of the above embodiments, it is possible to realize a small zoom lens having a high image forming performance by disposing the focusing lens and the anti-vibration lens in the same lens group.
The zoom lens according to each embodiment has no mutual movement of the sub-groups in the third lens group except for the focusing operation and the image stabilization operation, and the focusing lens and the image stabilization lens are integrated when zooming. Therefore, downsizing is facilitated.
In addition, the zoom lens according to each embodiment adopts a so-called internal focusing method and performs focusing with a lens having a small size, thereby reducing the weight of the focusing lens and reducing the amount of movement thereof. . Thereby, the noise reduction at the time of focusing can be achieved.
In addition, each said Example has shown one specific example of this invention, and this invention is not limited to these.

The following contents can be appropriately adopted within a range that does not impair the optical performance of the zoom lens of the present application.
A numerical example of the zoom lens of the present application is shown as having a three-group configuration, but the present application is not limited to this, and a zoom lens of another group configuration (for example, four groups) can also be configured. Specifically, a configuration in which a lens or a lens group is added to the most object side or the most image side of the zoom lens of the present application may be used. The lens group is a portion having at least one lens that is separated from the first to third lens groups in the zoom lens of the present application by an air interval that changes during zooming.

In addition, the zoom lens of the present application is used in order to focus from an object at infinity to an object at a short distance. It is good also as a structure moved to. In particular, it is preferable that at least a part of the third lens group is a focusing lens group. Such a focusing lens group can also be applied to autofocus, and is also suitable for driving by an autofocus motor, such as an ultrasonic motor.
In the zoom lens of the present application, either the entire lens group or a part thereof is moved so as to include a component perpendicular to the optical axis as an anti-vibration lens group, or rotated in an in-plane direction including the optical axis ( The image blur caused by camera shake or the like can be corrected by swinging). In particular, in the zoom lens of the present application, it is preferable that at least a part of the third lens group is an anti-vibration lens group.

  The lens surface of the lens constituting the zoom lens of the present application may be a spherical surface, a flat surface, or an aspheric surface. When the lens surface is a spherical surface or a flat surface, it is preferable because lens processing and assembly adjustment are easy, and deterioration of optical performance due to errors in lens processing and assembly adjustment can be prevented. Further, even when the image plane is deviated, it is preferable because there is little deterioration in drawing performance. When the lens surface is aspherical, any of aspherical surface by grinding, glass mold aspherical surface in which glass is molded into an aspherical shape, or composite aspherical surface in which resin provided on the glass surface is formed in an aspherical shape Good. The lens surface may be a diffractive surface, and the lens may be a gradient index lens (GRIN lens) or a plastic lens.

In the zoom lens of the present application, it is preferable that the aperture stop is disposed in the third lens group, and the role may be substituted by a lens frame without providing a member as the aperture stop.
Further, an antireflection film having a high transmittance in a wide wavelength range may be provided on the lens surface of the lens constituting the zoom lens of the present application. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.

Next, a camera equipped with the zoom lens of the present application will be described with reference to FIGS.
FIGS. 17A and 17B are a front view and a rear view of an electronic camera provided with the zoom lens of the present application, respectively. 18 is a cross-sectional view taken along the line AA ′ of FIG.
The camera 1 is an interchangeable lens type electronic still camera provided with the zoom lens according to the first embodiment as the photographing lens 2 as shown in FIGS.

  In the camera 1, light from a subject (not shown) is condensed on an image pickup device (for example, CCD, CMOS, etc.) C disposed on the image plane I by a photographing lens 2 to form a subject image. This subject image is picked up by the image pickup device C when a photographer presses a power button (not shown) and displayed on the liquid crystal monitor 3 provided on the back of the camera 1. As a result, the photographer determines the composition of the subject image while looking at the liquid crystal monitor 3 and then presses the release button 4 so that the subject image is picked up by the image sensor C and recorded and stored in a memory (not shown). Become. In this way, the photographer can shoot a subject using the camera 1. The camera 1 further includes an auxiliary light emitting unit 5 that emits auxiliary light when the shooting environment is dark, a function button 7 for setting various conditions of the camera 1, and the like.

  With the configuration described above, the present camera 1 equipped with the zoom lens according to the first embodiment as the photographing lens 2 has a focusing lens and an anti-vibration lens arranged in the same lens group. High imaging performance can be realized. Even if a camera equipped with the zoom lenses according to the second, third, and fourth embodiments is configured as the photographing lens 2, the same effect as the camera 1 can be obtained. The zoom lens of the present application is not limited to the electronic still camera as described above, and can be applied to other optical devices such as a digital video camera and a film camera. In addition, the zoom lens of the present application is not limited to the camera having the quick return mirror as described above, and can be applied to a single-lens reflex camera.

Finally, the outline of the manufacturing method of the zoom lens of this application is demonstrated based on FIG.
FIG. 19 is a diagram showing an outline of the zoom lens manufacturing method of the present application.
The zoom lens manufacturing method of the present application shown in FIG. 19 includes, in order from the object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens having a positive refractive power. A zoom lens manufacturing method having a lens group, which includes the following steps S1 to S5.
Step S1: The third lens group, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, and a third partial group having a negative refractive power; A fourth partial group having a positive refractive power, and each lens group is arranged in the lens barrel in order from the object side.
Step S2: By providing a known moving mechanism or the like, the interval between the lens groups is changed upon zooming.

Step S3: A focusing operation is performed by moving the first partial group in the optical axis direction by providing a known moving mechanism.
Step S4: Image blurring is corrected by moving the third partial group so as to include a component in a direction perpendicular to the optical axis by providing a known moving mechanism.
Step S5: Each lens group is made to satisfy the following conditional expression (1).
(1) 0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum amount of movement of the third lens group According to the zoom lens manufacturing method of the present application, the focusing lens and the anti-vibration lens are arranged in the same lens group, and are small and high. A zoom lens having imaging performance can be manufactured.

G1 1st lens group G2 2nd lens group G3 3rd lens group B1 1st partial group B2 2nd partial group B3 3rd partial group B4 4th partial group S Aperture stop I Image surface

Claims (7)

In order from the object side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and the third lens group having a positive refractive power are substantially three lens groups. Consists of
The distance between the lens groups changes upon zooming,
The third lens group includes, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, a third partial group having a negative refractive power, and a positive A fourth subgroup having refractive power,
The first partial group performs a focusing operation by moving in the optical axis direction,
Correcting the image blur by moving the third sub-group to include a component in a direction perpendicular to the optical axis;
A zoom lens satisfying the following conditional expression:
0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum movement amount of the third lens group The zoom lens according to claim 1.
A zoom lens satisfying the following conditional expression:
0.165 <F3 / Ft <0.250
However,
F3: focal length of the third lens group Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state The zoom lens according to claim 1 or 2,
A zoom lens satisfying the following conditional expression:
0.45 <F1 / Ft <0.70
However,
F1: Focal length of the first lens group Ft: Focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state In the zoom lens according to any one of claims 1 to 3 ,
The zoom lens according to claim 4, wherein the fourth partial group includes at least one positive lens component and at least two negative lens components. In the zoom lens according to any one of claims 1 to 3 ,
The zoom lens according to claim 4, wherein the fourth partial group includes at least two positive lens components and at least one negative lens component. An optical apparatus comprising the zoom lens according to any one of claims 1 to 5 . In order from the object side, the first lens group having a positive refractive power, the second lens group having a negative refractive power, and the third lens group having a positive refractive power are substantially three lens groups. A zoom lens manufacturing method comprising:
The third lens group includes, in order from the object side, a first partial group having a positive refractive power, a second partial group having a positive refractive power, a third partial group having a negative refractive power, and a positive A fourth subgroup having refractive power,
The distance between the lens groups changes upon zooming,
The first partial group moves in the optical axis direction to perform a focusing operation,
The third partial group is corrected so as to correct image blur by moving so as to include a component in a direction perpendicular to the optical axis.
A zoom lens manufacturing method characterized by satisfying the following conditional expression:
0.000 <(Ft × Fw) / (F3 × X3) <13.500
However,
Ft: focal length of the entire zoom lens system when focusing on an object at infinity in the telephoto end state Fw: focal length of the entire zoom lens system when focusing on an object at infinity in the wide-angle end state F3: of the third lens group Focal length X3: Maximum movement amount of the third lens group

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