JP2013182017A - Variable power optical system, optical device, and method for manufacturing variable power optical system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact variable power optical system having a vibration-proof function, a high variable power, a wide angle of view and excellent optical performance, an optical device, and a method for manufacturing the variable power optical system.SOLUTION: A variable power optical system comprises, in order from an object side: a first lens group G1 having positive refractive power; a second lens group G2 having negative refractive power; a third lens group G3 having positive refractive power; and a fourth lens group G4 having positive refractive power. When varying power from a wide angle end to a telephoto end, the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, and the distance between the third lens group G3 and the fourth lens group G4 change. The third lens group G3 comprises, in order from the object side, a first partial group G31 having positive refractive power and a second partial group G32. The second partial group G32 moves in a direction including a direction component perpendicular to the optical axis. The variable power optical system satisfies a predetermined conditional expression.

Description

  The present invention relates to a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system.

  Conventionally, a variable magnification optical system suitable for a photographic camera, an electronic still camera, a video camera, and the like has been proposed (see, for example, Patent Document 1).

JP 2006-284863 A

However, the conventional variable power optical system as described above is large, and there is a problem in that optical performance is significantly deteriorated if an attempt is made to increase the zoom power while having an anti-vibration function.
Therefore, the present invention has been made in view of the above problems, and has a vibration reduction function, a high zoom ratio, a wide angle of view, and a compact zoom optical system, an optical apparatus, and a good optical performance, and It is an object of the present invention to provide a method for manufacturing a variable magnification optical system.

In order to solve the above problems, the present invention
In order from the object 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 having a positive refractive power And having a group
Upon zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group changes,
The third lens group includes, in order from the object side, a first partial group having a positive refractive power and a second partial group.
The second subgroup moves to include a component in a direction perpendicular to the optical axis;
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group

The present invention also provides
Provided is an optical device comprising the variable magnification optical system.
The present invention also provides
In order from the object 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 having a positive refractive power A variable magnification optical system having a group,
The third lens group includes, in order from the object side, a first partial group having a positive refractive power and a second partial group.
The first lens group and the second lens group satisfy the following conditional expression:
Upon zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group changes,
There is provided a method of manufacturing a variable magnification optical system, wherein the second partial group is moved so as to include a component in a direction orthogonal to the optical axis.
8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group

  According to the present invention, there are provided a small variable power optical system, an optical device, and a method for manufacturing the variable power optical system that have an anti-vibration function, a high variable power, a wide field angle, and good optical performance. be able to.

(A), (b), and (c) are sectional views in the wide-angle end state, intermediate focal length state, and telephoto end state, respectively, of the variable magnification optical system according to the first example of the present application. (A), (b), and (c) are various figures at the time of focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the first example of the present application, respectively. It is an aberration diagram. (A) and (b) are respectively meridional lateral aberration diagrams obtained when 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 variable magnification optical system according to the first example of the present application. It is. (A), (b), and (c) are sectional views of the variable magnification optical system according to the second example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. (A), (b), and (c) are various values at the time of focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second example of the present application, respectively. It is an aberration diagram. (A) and (b) are respectively meridional transverse aberration diagrams obtained when 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 variable magnification optical system according to the second example of the present application. It is. (A), (b), and (c) are sectional views of the variable magnification optical system according to the third example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. (A), (b), and (c) are various values at the time of focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example of the present application, respectively. It is an aberration diagram. (A) and (b) are respectively meridional transverse aberration diagrams obtained when 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 variable magnification optical system according to the third example of the present application. It is. (A), (b), and (c) are sectional views in the wide-angle end state, intermediate focal length state, and telephoto end state, respectively, of the variable magnification optical system according to the fourth example of the present application. (A), (b), and (c) are various values at the time of focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fourth example of the present application, respectively. It is an aberration diagram. (A) and (b) are respectively meridional transverse aberration diagrams obtained when 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 variable magnification optical system according to the fourth example of the present application. It is. (A), (b), and (c) are sectional views of the variable magnification optical system according to the fifth example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. (A), (b), and (c) are various values at the time of focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example of the present application, respectively. It is an aberration diagram. (A) and (b) are respectively meridional lateral aberration diagrams obtained when 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 variable magnification optical system according to the fifth example of the present application. It is. (A), (b), and (c) are sectional views of the variable magnification optical system according to the sixth example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. (A), (b), and (c) are various values at the time of focusing on an object at infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example of the present application, respectively. It is an aberration diagram. (A) and (b) are meridional 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 variable magnification optical system according to the sixth example of the present application, respectively. It is. It is a figure which shows the structure of the camera provided with the variable magnification optical system of this application. It is a figure which shows the outline of the manufacturing method of the variable magnification optical system of this application.

Hereinafter, a variable magnification optical system, an optical apparatus, and a method for manufacturing the variable magnification optical system of the present application will be described.
The variable magnification optical system 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, a third lens group having a positive refractive power, And a fourth lens group having a refractive power of ## EQU2 ## for zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, and the second lens group and the second lens group. A distance between the third lens group and a distance between the third lens group and the fourth lens group, and the third lens group includes a first partial group having a positive refractive power in order from the object side; , And the second partial group moves so as to include a component in a direction orthogonal to the optical axis, and satisfies the following conditional expression (1).
(1) 8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group

The variable magnification optical system of the present application moves the second partial group in the third lens group so as to include a component in a direction perpendicular to the optical axis as described above, thereby correcting image blur when camera shake occurs, that is, Anti-vibration can be performed.
Conditional expression (1) defines the focal length of the first lens group relative to the focal length of the second lens group. By satisfying conditional expression (1), the variable magnification optical system of the present application can correct field curvature well in the wide-angle end state and can satisfactorily correct spherical aberration in the telephoto end state.

When the corresponding value of the conditional expression (1) of the zoom optical system of the present application exceeds the upper limit value, the zoom effect of the first lens group becomes small. For this reason, it is necessary to increase the refractive power of the second lens group in order to ensure the zoom ratio, and as a result, the occurrence of field curvature in the wide-angle end state and the occurrence of spherical aberration in the telephoto end state are caused. Therefore, it is not preferable. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (1) to 9.70.
On the other hand, if the corresponding value of conditional expression (1) of the variable magnification optical system of the present application is less than the lower limit value, the refractive power of the first lens unit becomes large, and it becomes difficult to correct spherical aberration in the telephoto end state. Therefore, it is not preferable. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (1) to 8.10.
With the above configuration, it is possible to realize a small variable magnification optical system having a vibration isolation function, a high variable magnification, a wide angle of view, and good optical performance.

In the variable magnification optical system of the present application, it is desirable that the second partial group has a negative refractive power. With this configuration, it is possible to reduce the size of the variable magnification optical system of the present application and suppress fluctuations in coma aberration at the time of decentering.
Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (2).
(2) 0.60 <f3 / f4 <0.90
However,
f3: focal length of the third lens group f4: focal length of the fourth lens group

Conditional expression (2) defines the focal length of the third lens group with respect to the focal length of the fourth lens group. By satisfying conditional expression (2), the variable magnification optical system of the present application can correct field curvature and coma well in the wide-angle end state, and can properly correct spherical aberration in the telephoto end state.
When the corresponding value of the conditional expression (2) of the variable magnification optical system of the present application exceeds the upper limit value, the refractive power of the fourth lens unit increases, making it difficult to correct field curvature and coma in the wide-angle end state. This is not preferable. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (2) to 0.85.
On the other hand, if the corresponding value of conditional expression (2) of the variable magnification optical system of the present application is less than the lower limit value, the refractive power of the third lens unit becomes large, and it becomes difficult to correct spherical aberration particularly in the telephoto end state. This is not preferable. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (2) to 0.65.

Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (3).
(3) 2.80 <f1 / f3 <4.50
However,
f1: Focal length of the first lens group f3: Focal length of the third lens group

Conditional expression (3) defines the focal length of the first lens group with respect to the focal length of the third lens group. By satisfying conditional expression (3), the variable magnification optical system of the present application can correct field curvature well in the wide-angle end state and can satisfactorily correct spherical aberration in the telephoto end state.
When the corresponding value of the conditional expression (3) of the zoom optical system of the present application exceeds the upper limit value, the zoom effect of the first lens group becomes small. For this reason, it is necessary to increase the refractive power of the second lens group in order to ensure the zoom ratio, and as a result, the occurrence of field curvature in the wide-angle end state and the occurrence of spherical aberration in the telephoto end state are caused. Therefore, it is not preferable. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (3) to 4.30.
On the other hand, if the corresponding value of conditional expression (3) of the variable magnification optical system of the present application is lower than the lower limit value, the refractive power of the first lens unit increases, and it becomes difficult to correct spherical aberration in the telephoto end state. Therefore, it is not preferable. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (3) to 3.00.

Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (4).
(4) 2.20 <f1 / f4 <3.50
However,
f1: Focal length of the first lens group f4: Focal length of the fourth lens group

Conditional expression (4) defines the focal length of the first lens group with respect to the focal length of the fourth lens group. By satisfying conditional expression (4), the variable magnification optical system of the present application can satisfactorily correct field curvature and coma in the wide-angle end state, and can satisfactorily correct spherical aberration in the telephoto end state.
If the corresponding value of the conditional expression (4) of the variable magnification optical system of the present application exceeds the upper limit value, the refractive power of the fourth lens unit increases, making it difficult to correct field curvature and coma in the wide-angle end state. This is not preferable. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (4) to 3.30.
On the other hand, if the corresponding value of conditional expression (4) of the variable magnification optical system of the present application is lower than the lower limit value, the refractive power of the first lens unit increases, and it becomes difficult to correct spherical aberration in the telephoto end state. Therefore, it is not preferable. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (4) to 2.50.

In the variable power optical system of the present application, it is desirable that at least a part of the second lens group moves in the optical axis direction during focusing. By performing focusing with at least a part of the small and lightweight second lens group, rapid focusing can be achieved.
Further, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (5).
(5) 0.20 <| f32 | / f1 <0.43
However,
f1: focal length of the first lens group f32: focal length of the second partial group

Conditional expression (5) defines the focal length of the second subgroup with respect to the focal length of the first lens group. The variable magnification optical system of the present application satisfactorily corrects spherical aberration in the telephoto end state by satisfying conditional expression (5), and moves the second subgroup so as to include a component in a direction orthogonal to the optical axis. Coma can be corrected well.
If the corresponding value of the conditional expression (5) of the variable magnification optical system of the present application exceeds the upper limit value, the refractive power of the first lens unit increases, and it becomes difficult to correct spherical aberration in the telephoto end state. It is not preferable. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (5) to 0.41.
On the other hand, when the corresponding value of conditional expression (5) of the zoom optical system of the present application is lower than the lower limit value, the refractive power of the second subgroup increases. For this reason, when the second partial group is moved so as to include a component in a direction perpendicular to the optical axis, coma aberration is deteriorated, which is not preferable. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (5) to 0.25.

In the variable magnification optical system of the present application, it is desirable that the second partial group is composed of a cemented lens of one positive lens and one negative lens. With this configuration, it is possible to satisfactorily correct the eccentric coma aberration when the second partial group is moved so as to include a component in a direction orthogonal to the optical axis.
Further, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (6).
(6) 0.35 <(− f2) / f3 <0.55
However,
f2: focal length of the second lens group f3: focal length of the third lens group

Conditional expression (6) defines the focal length of the second lens group with respect to the focal length of the third lens group. By satisfying conditional expression (6), the variable magnification optical system of the present application can correct field curvature well in the wide-angle end state and can properly correct spherical aberration in the telephoto end state.
When the corresponding value of the conditional expression (6) of the zoom optical system of the present application exceeds the upper limit value, the zoom effect of the second lens group becomes small. For this reason, it is necessary to increase the refractive power of the first lens group in order to ensure the zoom ratio, and as a result, the occurrence of field curvature in the wide-angle end state and the occurrence of spherical aberration in the telephoto end state are caused. Therefore, it is not preferable. In order to secure the effect of the present application, it is more preferable to set the upper limit of conditional expression (6) to 0.52.
On the other hand, when the corresponding value of conditional expression (6) of the zoom optical system of the present application is below the lower limit value, the zoom effect of the third lens group is reduced. For this reason, it is necessary to increase the refractive power of the first lens group or the second lens group in order to ensure the zoom ratio, and as a result, the spherical aberration in the telephoto end state and the field curvature in the wide-angle end state are corrected. This is not preferable because it becomes difficult to do. In order to secure the effect of the present application, it is more preferable to set the lower limit of conditional expression (6) to 0.38.

In the variable power optical system of the present application, it is desirable that the first lens group moves in the optical axis direction upon zooming from the wide-angle end state to the telephoto end state. With this configuration, it is possible to reduce the refractive power of each lens group involved in zooming, that is, the first to fourth lens groups, and to ensure good optical performance from the wide-angle end state to the telephoto end state. .
The optical apparatus according to the present application includes the variable magnification optical system having the above-described configuration. As a result, it is possible to realize a small optical device having an anti-vibration function, a high zoom ratio, a wide angle of view, and good optical performance.

The variable magnification optical system 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. And a fourth lens group having positive refracting power, and a variable magnification optical system, wherein the third lens group has, in order from the object side, a first partial group having positive refracting power; A second partial group, and the first lens group and the second lens group satisfy the following conditional expression (1), and at the time of zooming from the wide-angle end state to the telephoto end state, An interval between one lens group and the second lens group, an interval between the second lens group and the third lens group, and an interval between the third lens group and the fourth lens group, respectively. The second subgroup moves so as to include a component in a direction perpendicular to the optical axis. The features. As a result, it is possible to manufacture a small variable magnification optical system having a vibration isolation function, a high variable magnification, a wide angle of view, and good optical performance.
(1) 8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group

Hereinafter, a variable magnification optical system according to numerical examples of the present application will be described with reference to the accompanying drawings.
(First embodiment)
1A, 1B, and 1C are cross-sectional views of the zoom optical system according to the first example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
The variable magnification optical system according to the present example 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 having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power.
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens having an aspheric lens surface on the object side.

The third lens group G3 includes, in order from the object side, a first partial group G31 having a positive refractive power and a second partial group G32 having a negative refractive power. An aperture stop S is provided on the object side of the third lens group G3.
The first partial group G31 includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33.
The second partial group G32 includes, in order from the object side, only a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface directed toward the object side.
The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, and a cemented lens of a positive meniscus lens L42 having a concave surface facing the object side and a negative meniscus lens L43 having a concave surface facing the object side. Become. The positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

With the above-described configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telephoto end state. The first lens group G1 and the third lens group G3 so that the air gap between the second lens group G2 and the third lens group G3 decreases and the air gap between the third lens group G3 and the fourth lens group G4 changes. , And the fourth lens group G4 moves to the object side along the optical axis, and the second lens group G2 moves along the optical axis. At this time, the aperture stop S moves together with the third lens group G3.
In the variable power optical system according to the present embodiment, the second lens group G2 is moved to the object side along the optical axis, thereby focusing from an object at infinity to a near object.
In addition, the zoom optical system according to the present embodiment performs image stabilization by moving only the second partial group G32 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis when camera shake or the like occurs.

Table 1 below lists values of specifications of the variable magnification optical system according to the present example.
In Table 1, f indicates the focal length, and BF indicates the back focus.
In [Surface data], the surface number is the order of the optical surfaces counted from the object side, r is the radius of curvature of the lens surface, d is the surface spacing on the optical axis, and nd is the refraction with respect to the d-line (wavelength λ = 587.6 nm). The ratio, νd, represents the Abbe number for the d-line (wavelength λ = 587.6 nm). In addition, the object plane indicates the object plane, the variable indicates the variable plane spacing, the stop S indicates the aperture stop S, and the image plane indicates the image plane I. The radius of curvature r = ∞ indicates a plane. Further, the aspherical surface is marked with * as the surface number, and the paraxial radius of curvature is shown in the column of the radius of curvature r.

[Aspherical data] shows an aspherical coefficient and a conic constant when the shape of the aspherical surface shown in [Surface data] is expressed by the following equation.
x = (h ² / r) / [1+ {1−κ (h / r) ² } ^1/2 ]
+ A4h ⁴ + A6h ⁶ + A8h ⁸ + A10h ¹⁰
Here, h is the height in the direction perpendicular to the optical axis, x is the distance (sag amount) from the tangent plane of the apex of the aspheric surface to the aspheric surface at the height h, and κ is the conic constant. , A4, A6, A8, A10 are aspherical coefficients, and r is the radius of curvature of the reference sphere (paraxial radius of curvature). “E−n” (n: integer) indicates “× 10 ⁻ⁿ ”, for example “1.234E-05” indicates “1.234 × 10 ⁻⁵ ”.

In [various data], FNO is the F number, 2ω is the angle of view (unit is “°”), Y is the image height, TL is the total length of the variable magnification optical system, and di (i: integer) is the variable of the i-th surface. The surface spacing is shown. W represents the wide-angle end state, M represents the intermediate focal length state, and T represents the telephoto end state.
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.

  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 variable magnification optical system according to the present example has a vibration isolation coefficient of −0.88 and a focal length of 10.0 (mm) in the wide-angle end state, and thus corrects a rotational shake of 1.00 °. The amount of movement of the anti-vibration lens group is 0.20 (mm). In the telephoto end state, the image stabilization coefficient is -1.92 and the focal length is 100.0 (mm). Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.32 ° is 0. .29 (mm).

(Table 1) First Example
[Surface data]
Surface number r d nd νd
Object ∞
1 459.647 1.600 1.953660 30.27
2 57.423 6.819 1.497820 82.51
3 -154.085 0.100 1.000000
4 56.956 5.161 1.878896 41.01
5 569.648 Variable 1.000000

* 6 38.479 1.200 1.882991 40.76
7 8.366 3.937 1.000000
8 -16.649 1.200 1.864046 41.96
9 53.630 0.100 1.000000
10 21.938 3.669 1.846659 23.78
11 -14.738 0.417 1.000000
12 -12.219 1.200 1.882997 40.76
13 -43.622 Variable 1.000000

14 (Aperture S) ∞ 1.000 1.000000

15 23.408 3.198 1.754999 52.31
16 -31.880 0.100 1.000000
17 15.118 3.851 1.497820 82.51
18 -19.673 1.200 1.856445 26.89
19 59.726 2.566 1.000000
20 -68.834 1.200 1.822803 45.06
21 7.553 3.351 1.878191 37.36
22 24.293 Variable 1.000000

* 23 16.648 3.632 1.497820 82.51
24 -23.750 0.100 1.000000
25 -553.763 4.361 1.577760 40.84
26 -8.231 1.200 1.882997 40.76
27 -42.498 BF 1.000000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
6 1 1.54E-05 -2.59E-08 3.23E-10 6.63E-12
23 -0.3689 -1.24E-05 6.50E-07 -5.31E-09 1.67E-10

[Various data]
Scaling ratio 10.00

W M T
f 10.00 50.02 100.00
FNO 3.50 4.80 5.60
2ω 82.49 ° 18.42 ° 9.30 °
Y 8.350 8.350 8.350
TL 92.33 135.76 153.35
BF 13.25 39.10 42.51

W M T
d5 2.301 37.043 53.748
d13 19.357 5.095 2.400
d22 6.260 3.363 3.524

[Lens group data]
Group start surface f
1 1 85.1
2 6 -9.4
3 15 21.3
4 23 28.4

[Conditional expression values]
(1) f1 / (− f2) = 9.04
(2) f3 / f4 = 0.75
(3) f1 / f3 = 3.99
(4) f1 / f4 = 3.00
(5) | f32 | /f1=0.28
(6) (−f2) /f3=0.44

2 (a), 2 (b), and 2 (c) respectively show infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the first example of the present application. It is an aberration diagram at the time of focusing on an object.
3 (a) and 3 (b) respectively show image stabilization against rotational shake of 1.00 ° when focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the first example of the present application. FIG. 6 is a meridional lateral aberration diagram when performing the zooming, and a meridional lateral aberration diagram when performing anti-vibration against 0.32 ° rotation blur when focusing on an object at infinity in the telephoto end state.

In each aberration diagram, FNO represents an F number, and Y represents an image height. 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. 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 variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has image performance.

(Second embodiment)
FIGS. 4A, 4B, and 4C are cross-sectional views of the zoom optical system according to the second example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
The variable magnification optical system according to the present example 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 having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power.
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens having an aspheric lens surface on the object side.

The third lens group G3 includes, in order from the object side, a first partial group G31 having a positive refractive power and a second partial group G32 having a negative refractive power.
The first partial group G31 includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33. An aperture stop S is provided between the positive lens L31 and the positive lens L32.
The second partial group G32 includes, in order from the object side, only a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface directed toward the object side.
The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a cemented lens of a biconvex positive lens L42, and a negative meniscus lens L43 having a concave surface facing the object side. The positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

With the above-described configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telephoto end state. The first lens group G1 and the third lens group G3 so that the air gap between the second lens group G2 and the third lens group G3 decreases and the air gap between the third lens group G3 and the fourth lens group G4 changes. , And the fourth lens group G4 moves to the object side along the optical axis, and the second lens group G2 moves along the optical axis. At this time, the aperture stop S moves together with the third lens group G3.
In the variable power optical system according to the present embodiment, the second lens group G2 is moved to the object side along the optical axis, thereby focusing from an object at infinity to a near object.
In addition, the zoom optical system according to the present embodiment performs image stabilization by moving only the second partial group G32 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis when camera shake or the like occurs.

Table 2 below provides values of specifications of the variable magnification optical system according to the present example.
Here, since the variable magnification optical system according to the present example has a vibration isolation coefficient of −0.61 and a focal length of 10.3 (mm) in the wide-angle end state, the rotation blur of 0.99 ° is corrected. Therefore, the movement amount of the anti-vibration lens group is 0.28 (mm). In the telephoto end state, the image stabilization coefficient is −1.42 and the focal length is 97.0 (mm). Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.32 ° is 0. .38 (mm).

(Table 2) Second Example
[Surface data]
Surface number r d nd νd
Object ∞
1 214.935 1.600 1.953660 30.27
2 60.293 6.140 1.497820 82.51
3 -216.386 0.100 1.000000
4 59.192 4.825 1.810230 46.17
5 516.132 Variable 1.000000

* 6 32.741 1.200 1.882997 40.76
7 8.577 4.007 1.000000
8 -15.726 1.200 1.839050 43.75
9 46.418 0.100 1.000000
10 21.908 3.623 1.846660 23.78
11 -16.185 0.601 1.000000
12 -11.861 1.200 1.882997 40.76
13 -33.094 Variable 1.000000

14 24.800 2.781 1.754999 52.31
15 -39.736 0.500 1.000000
16 (Aperture S) ∞ 1.600 1.000000
17 14.646 3.397 1.497820 82.51
18 -19.677 1.200 1.852045 25.40
19 69.922 2.144 1.000000
20 -879.676 1.200 1.802688 46.87
21 8.771 2.765 1.876437 36.60
22 23.971 Variable 1.000000

* 23 17.538 3.382 1.497820 82.51
24 -22.122 0.100 1.000000
25 712.073 4.071 1.625207 37.14
26 -8.262 1.200 1.882997 40.76
27 -97.309 BF 1.000000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
6 1 1.66E-05 1.53E-07 -4.44E-09 5.56E-11
23 1 -5.70E-05 6.19E-07

[Various data]
Scaling ratio 9.42

W M T
f 10.30 49.99 96.98
FNO 3.50 5.20 5.67
2ω 79.71 ° 17.90 ° 9.37 °
Y 8.190 8.190 8.190
TL 89.39 132.08 150.34
BF 13.54 36.00 44.01

W M T
d5 2.317 38.392 51.572
d13 18.962 5.444 2.400
d22 5.643 3.306 3.427

[Lens group data]
Group start surface f
1 1 86.9
2 6 -9.6
3 14 21.2
4 23 31.0

[Conditional expression values]
(1) f1 / (-f2) = 9.09
(2) f3 / f4 = 0.69
(3) f1 / f3 = 4.10
(4) f1 / f4 = 2.81
(5) | f32 | /f1=0.40
(6) (−f2) /f3=0.45

FIGS. 5 (a), 5 (b), and 5 (c) respectively show infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the second example of the present application. It is an aberration diagram at the time of focusing on an object.
6 (a) and 6 (b) respectively show image stabilization against rotational shake of 0.99 ° when focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the second example of the present application. FIG. 6 is a meridional lateral aberration diagram when performing the zooming, and a meridional lateral aberration diagram when performing anti-vibration against 0.32 ° rotation blur when focusing on an object at infinity in the telephoto end state.
From each aberration diagram, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has image performance.

(Third embodiment)
FIGS. 7A, 7B, and 7C are cross-sectional views of the zoom optical system according to the third example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
The variable magnification optical system according to the present example 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 having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power.
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens having an aspheric lens surface on the object side.

The third lens group G3 includes, in order from the object side, a first partial group G31 having a positive refractive power and a second partial group G32 having a negative refractive power.
The first partial group G31 includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33. An aperture stop S is provided between the positive lens L31 and the positive lens L32.
The second partial group G32 includes, in order from the object side, only a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface directed toward the object side.
The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a cemented lens of a biconvex positive lens L42, and a negative meniscus lens L43 having a concave surface facing the object side. The positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

With the above-described configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telephoto end state. The first lens group G1 and the third lens group G3 so that the air gap between the second lens group G2 and the third lens group G3 decreases and the air gap between the third lens group G3 and the fourth lens group G4 changes. , And the fourth lens group G4 moves to the object side along the optical axis, and the second lens group G2 moves along the optical axis. At this time, the aperture stop S moves together with the third lens group G3.
In the variable power optical system according to the present embodiment, the second lens group G2 is moved to the object side along the optical axis, thereby focusing from an object at infinity to a near object.
In addition, the zoom optical system according to the present embodiment performs image stabilization by moving only the second partial group G32 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis when camera shake or the like occurs.

Table 3 below lists values of specifications of the variable magnification optical system according to the present example.
Here, since the variable magnification optical system according to the present example has an anti-vibration coefficient of −0.79 and a focal length of 10.3 (mm) in the wide-angle end state, it corrects rotational shake of 0.60 °. Therefore, the movement amount of the anti-vibration lens group is 0.14 (mm). In the telephoto end state, the image stabilization coefficient is -1.74 and the focal length is 97.0 (mm), so the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.19 ° is 0. 19 (mm).

(Table 3) Third Example
[Surface data]
Surface number r d nd νd
Object ∞
1 167.891 1.600 1.950000 29.37
2 69.549 5.925 1.497820 82.51
3 -183.905 0.100 1.000000
4 56.184 4.388 1.729157 54.66
5 198.836 Variable 1.000000

* 6 41.829 1.200 1.882997 40.76
7 8.946 3.756 1.000000
8 -17.431 1.200 1.864742 41.92
9 38.456 0.100 1.000000
10 20.545 3.705 1.846660 23.78
11 -15.937 0.629 1.000000
12 -11.749 1.200 1.882997 40.76
13 -35.044 Variable 1.000000

14 24.738 2.730 1.754999 52.31
15 -36.975 0.500 1.000000
16 (Aperture S) ∞ 1.600 1.000000
17 14.497 3.278 1.497820 82.51
18 -19.591 1.200 1.851149 25.12
19 97.099 2.184 1.000000
20 -105.628 1.200 1.875733 41.21
21 8.299 2.780 1.939960 33.32
22 26.001 Variable 1.000000

* 23 20.461 3.205 1.497820 82.51
24 -22.765 0.100 1.000000
25 175.793 3.930 1.616359 38.32
26 -9.172 1.200 1.883682 40.65
27 -65.712 BF 1.000000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
6 1 1.28E-05 5.16E-08 -8.45E-10 2.36E-11
23 1 -5.71E-05 2.70E-07

[Various data]
Scaling ratio 9.42

W M T
f 10.30 50.00 97.00
FNO 3.50 5.20 5.60
2ω 79.71 ° 17.90 ° 9.37 °
Y 8.190 8.190 8.190
TL 89.38 132.39 150.35
BF 14.01 36.64 44.30

W M T
d5 2.319 39.217 52.463
d13 19.087 5.422 2.400
d22 6.245 3.394 3.481

[Lens group data]
Group start surface f
1 1 88.3
2 6 -9.4
3 14 21.1
4 23 28.4

[Conditional expression values]
(1) f1 / (− f2) = 9.41
(2) f3 / f4 = 0.74
(3) f1 / f3 = 4.18
(4) f1 / f4 = 3.11
(5) | f32 | /f1=0.31
(6) (−f2) /f3=0.44

8 (a), 8 (b), and 8 (c) respectively show infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the third example of the present application. It is an aberration diagram at the time of focusing on an object.
9 (a) and 9 (b) respectively show anti-vibration against rotation blur of 0.60 ° when focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the third example of the present application. FIG. 6 is a meridional lateral aberration diagram when performing the zooming, and a meridional lateral aberration diagram when performing anti-vibration with respect to a rotational shake of 0.19 ° when focusing on an object at infinity in the telephoto end state.
From each aberration diagram, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has image performance.

(Fourth embodiment)
FIGS. 10A, 10B, and 10C are cross-sectional views of the zoom optical system according to the fourth example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
The variable magnification optical system according to the present example 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 having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power.
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens having an aspheric lens surface on the object side.

The third lens group G3 includes, in order from the object side, a first partial group G31 having a positive refractive power and a second partial group G32 having a negative refractive power.
The first partial group G31 includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33. An aperture stop S is provided between the positive lens L31 and the positive lens L32.
The second partial group G32 includes, in order from the object side, only a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface directed toward the object side.
The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, a cemented lens of a biconvex positive lens L42, and a negative meniscus lens L43 having a concave surface facing the object side. The positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

With the above-described configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telephoto end state. The first lens group G1 and the third lens group G3 so that the air gap between the second lens group G2 and the third lens group G3 decreases and the air gap between the third lens group G3 and the fourth lens group G4 changes. , And the fourth lens group G4 moves to the object side along the optical axis, and the second lens group G2 moves along the optical axis. At this time, the aperture stop S moves together with the third lens group G3.
In the variable power optical system according to the present embodiment, the second lens group G2 is moved to the object side along the optical axis, thereby focusing from an object at infinity to a near object.
In addition, the zoom optical system according to the present embodiment performs image stabilization by moving only the second partial group G32 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis when camera shake or the like occurs.

Table 4 below lists values of specifications of the variable magnification optical system according to the present example.
Here, since the variable magnification optical system according to the present example has an anti-vibration coefficient of −0.75 and a focal length of 10.3 (mm) in the wide-angle end state, it corrects rotational shake of 0.60 °. Therefore, the movement amount of the anti-vibration lens group is 0.14 (mm). Further, in the telephoto end state, since the image stabilization coefficient is −1.62 and the focal length is 97.0 (mm), the movement amount of the image stabilization lens group for correcting the rotation blur of 0.19 ° is 0. .20 (mm).

(Table 4) Fourth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 134.035 1.600 1.995973 28.75
2 56.255 5.824 1.497820 82.51
3 -238.373 0.100 1.000000
4 50.086 4.577 1.772927 50.05
5 242.611 Variable 1.000000

* 6 57.243 1.200 1.878662 37.67
7 8.942 3.645 1.000000
8 -17.572 1.200 1.882997 40.76
9 43.025 0.100 1.000000
10 20.980 3.779 1.810399 22.65
11 -15.077 0.580 1.000000
12 -11.668 1.200 1.882997 40.76
13 -30.843 Variable 1.000000

14 22.438 2.768 1.754910 52.33
15 -41.025 0.500 1.000000
16 (Aperture S) ∞ 1.600 1.000000
17 14.301 3.206 1.497820 82.51
18 -21.553 1.200 1.970527 23.71
19 96.060 2.155 1.000000
20 -149.641 1.200 1.882794 40.61
21 10.106 2.398 2.002300 28.33
22 24.619 Variable 1.000000

* 23 20.677 3.184 1.593190 67.90
24 -23.793 0.100 1.000000
25 610.600 3.859 1.605665 39.91
26 -8.915 1.200 1.890148 39.59
27 -90.902 BF 1.000000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
6 1 1.55E-05 -9.41E-08 2.04E-09 -1.22E-12
23 1 -4.75E-05 3.47E-07

[Various data]
Scaling ratio 9.42

W M T
f 10.30 50.00 97.01
FNO 3.50 5.20 5.60
2ω 79.71 ° 17.90 ° 9.37 °
Y 8.190 8.190 8.190
TL 89.33 125.89 140.87
BF 14.18 36.03 42.68

W M T
d5 2.328 33.549 45.003
d13 19.446 5.642 2.400
d22 6.199 3.500 3.615

[Lens group data]
Group start surface f
1 1 76.4
2 6 -9.3
3 14 21.8
4 23 28.5

[Conditional expression values]
(1) f1 / (− f2) = 8.25
(2) f3 / f4 = 0.76
(3) f1 / f3 = 3.51
(4) f1 / f4 = 2.68
(5) | f32 | /f1=0.38
(6) (−f2) /f3=0.43

11 (a), 11 (b), and 11 (c) respectively show infinity in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the fourth example of the present application. It is an aberration diagram at the time of focusing on an object.
FIGS. 12 (a) and 12 (b) respectively show image stabilization against rotation blur of 0.60 ° when focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the fourth example of the present application. FIG. 6 is a meridional lateral aberration diagram when performing the zooming, and a meridional lateral aberration diagram when performing anti-vibration with respect to a rotational shake of 0.19 ° when focusing on an object at infinity in the telephoto end state.
From each aberration diagram, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has image performance.

(5th Example)
FIGS. 13A, 13B, and 13C are cross-sectional views of the zoom optical system according to the fifth example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
The variable magnification optical system according to the present example 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 having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power.
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens having an aspheric lens surface on the object side.

The third lens group G3 includes, in order from the object side, a first partial group G31 having a positive refractive power, a second partial group G32 having a negative refractive power, and a third partial group G33 having a negative refractive power. Consists of.
The first partial group G31 includes, in order from the object side, a biconvex positive lens L31, a cemented lens of a biconvex positive lens L32, and a negative meniscus lens L33 having a concave surface facing the object side. An aperture stop S is provided between the positive lens L31 and the positive lens L32.
The second partial group G32 includes, in order from the object side, only a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface directed toward the object side.
The third partial group G33 includes only a biconcave negative lens L36.
The fourth lens group G4 includes, in order from the object side, a biconvex positive lens L41, and a cemented lens of a positive meniscus lens L42 having a concave surface facing the object side and a negative meniscus lens L43 having a concave surface facing the object side. Become. The positive lens L41 located closest to the object side in the fourth lens group G4 is an aspheric lens having an aspheric lens surface on the object side.

With the above-described configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telephoto end state. The first lens group G1 and the third lens group G3 so that the air gap between the second lens group G2 and the third lens group G3 decreases and the air gap between the third lens group G3 and the fourth lens group G4 changes. , And the fourth lens group G4 moves to the object side along the optical axis, and the second lens group G2 moves along the optical axis. At this time, the aperture stop S moves together with the third lens group G3.
In the variable power optical system according to the present embodiment, the second lens group G2 is moved to the object side along the optical axis, thereby focusing from an object at infinity to a near object.
In addition, the zoom optical system according to the present embodiment performs image stabilization by moving only the second partial group G32 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis when camera shake or the like occurs.

Table 5 below provides values of specifications of the variable magnification optical system according to the present example.
Here, since the variable magnification optical system according to the present example has an anti-vibration coefficient of −0.67 and a focal length of 10.3 (mm) in the wide-angle end state, the rotational shake of 0.60 ° is corrected. Therefore, the movement amount of the anti-vibration lens group is 0.16 (mm). In the telephoto end state, the image stabilization coefficient is −1.45 and the focal length is 97.0 (mm). Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.19 ° is 0. .23 (mm).

(Table 5) Fifth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 121.433 1.600 2.000942 28.06
2 56.973 5.569 1.497820 82.51
3 -262.775 0.100 1.000000
4 50.394 4.472 1.757194 52.03
5 230.587 Variable 1.000000

* 6 60.994 1.200 1.874937 35.34
7 8.965 3.574 1.000000
8 -18.928 1.200 1.882997 40.76
9 40.750 0.100 1.000000
10 20.638 3.681 1.831265 21.76
11 -16.433 0.539 1.000000
12 -12.501 1.200 1.882997 40.76
13 -37.209 Variable 1.000000

14 22.437 2.755 1.747287 52.75
15 -40.608 0.500 1.000000
16 (Aperture S) ∞ 1.600 1.000000
17 14.529 3.193 1.497820 82.51
18 -21.393 1.200 1.959603 22.45
19 -244.270 2.040 1.000000
20 -109.243 1.200 1.882997 40.76
21 11.581 2.339 1.964773 29.62
22 31.145 1.462 1.000000
23 -57.166 1.000 1.875553 35.71
24 96.176 Variable 1.000000

* 25 19.938 3.197 1.593190 67.90
26 -24.778 0.100 1.000000
27 -825.810 3.984 1.614364 38.61
28 -8.826 1.200 1.891733 39.34
29 -44.568 BF 1.000000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
6 1 1.18E-05 -7.24E-08 6.90E-10 5.95E-12
25 1 -6.37E-05 4.69E-07

[Various data]
Scaling ratio 9.42

W M T
f 10.30 50.00 97.00
FNO 3.50 5.20 5.59
2ω 79.72 ° 18.05 ° 9.42 °
Y 8.190 8.190 8.190
TL 89.33 125.73 140.86
BF 13.31 35.58 42.88

W M T
d5 2.329 33.140 44.235
d13 19.776 5.702 2.400
d24 4.905 2.300 2.341

[Lens group data]
Group start surface f
1 1 75.9
2 6 -9.2
3 14 20.7
4 25 23.8

[Conditional expression values]
(1) f1 / (-f2) = 8.24
(2) f3 / f4 = 0.87
(3) f1 / f3 = 3.66
(4) f1 / f4 = 3.19
(5) | f32 | /f1=0.41
(6) (−f2) /f3=0.44

FIGS. 14 (a), 14 (b), and 14 (c) respectively show infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the fifth example of the present application. It is an aberration diagram at the time of focusing on an object.
15 (a) and 15 (b) are each used to prevent vibration against rotational shake of 0.60 ° during focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the fifth example of the present application. FIG. 6 is a meridional lateral aberration diagram when performing the zooming, and a meridional lateral aberration diagram when performing anti-vibration with respect to a rotational shake of 0.19 ° when focusing on an object at infinity in the telephoto end state.
From each aberration diagram, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has image performance.

(Sixth embodiment)
16A, 16B, and 16C are cross-sectional views of the zoom optical system according to the sixth example of the present application in the wide-angle end state, the intermediate focal length state, and the telephoto end state, respectively. It is.
The variable magnification optical system according to the present example 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 having a positive refractive power. The lens group G3 includes a fourth lens group G4 having a positive refractive power and a fifth lens group G5 having a negative refractive power.
The first lens group G1 includes, in order from the object side, a cemented lens of a negative meniscus lens L11 having a convex surface facing the object side and a biconvex positive lens L12, and a positive meniscus lens L13 having a convex surface facing the object side. Become.
The second lens group G2 has a negative meniscus lens L21 having a convex surface directed toward the object side, a biconcave negative lens L22, a biconvex positive lens L23, and a concave surface directed toward the object side, in order from the object side. And a negative meniscus lens L24. The negative meniscus lens L21 located closest to the object side in the second lens group G2 is an aspheric lens having an aspheric lens surface on the object side.

The third lens group G3 includes, in order from the object side, a first partial group G31 having a positive refractive power and a second partial group G32 having a negative refractive power.
The first partial group G31 includes, in order from the object side, a biconvex positive lens L31, and a cemented lens of a biconvex positive lens L32 and a biconcave negative lens L33. An aperture stop S is provided between the positive lens L31 and the positive lens L32.
The second partial group G32 includes, in order from the object side, only a cemented lens of a biconcave negative lens L34 and a positive meniscus lens L35 having a convex surface directed toward the object side.
The fourth lens group G4 comprises solely a biconvex positive lens L41. The positive lens L41 is an aspheric lens having an aspheric lens surface on the object side.
The fifth lens group G5 comprises, in order from the object side, only a cemented lens of a positive meniscus lens L51 having a concave surface directed toward the object side and a negative meniscus lens L52 having a concave surface directed toward the object side.

With the above-described configuration, in the variable magnification optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 increases when the magnification is changed from the wide-angle end state to the telephoto end state. The air gap between the second lens group G2 and the third lens group G3 decreases, the air gap between the third lens group G3 and the fourth lens group G4 decreases, and the fourth lens group G4 and the fifth lens group G5 The first lens group G1, the third lens group G3, the fourth lens group G4, and the fifth lens group G5 move toward the object side along the optical axis so that the air gap increases, and the second lens group G2 Move along the optical axis. At this time, the aperture stop S moves together with the third lens group G3.
In the variable power optical system according to the present embodiment, the second lens group G2 is moved to the object side along the optical axis, thereby focusing from an object at infinity to a near object.
In addition, the zoom optical system according to the present embodiment performs image stabilization by moving only the second partial group G32 as an image stabilization lens group so as to include a component in a direction orthogonal to the optical axis when camera shake or the like occurs.

Table 6 below lists values of specifications of the variable magnification optical system according to the present example.
Here, since the variable magnification optical system according to the present example has an anti-vibration coefficient of −0.67 and a focal length of 10.3 (mm) in the wide-angle end state, the rotational shake of 0.60 ° is corrected. Therefore, the movement amount of the anti-vibration lens group is 0.16 (mm). In the telephoto end state, the image stabilization coefficient is −1.48 and the focal length is 97.0 (mm). Therefore, the amount of movement of the image stabilization lens group for correcting the rotation blur of 0.19 ° is 0. .22 (mm).

(Table 6) Sixth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 130.000 1.600 1.977550 30.05
2 53.215 5.870 1.497820 82.51
3 -301.577 0.100 1.000000
4 49.766 4.706 1.762484 51.33
5 285.082 Variable 1.000000

* 6 55.053 1.200 1.875647 35.77
7 8.920 3.605 1.000000
8 -18.863 1.200 1.882997 40.76
9 38.238 0.100 1.000000
10 20.860 3.659 1.830156 21.81
11 -16.640 0.611 1.000000
12 -12.286 1.200 1.882997 40.76
13 -32.821 Variable 1.000000

14 22.276 2.832 1.723962 54.17
15 -39.179 0.500 1.000000
16 (Aperture S) ∞ 1.600 1.000000
17 14.822 3.235 1.497820 82.51
18 -21.400 1.200 1.966413 23.23
19 294.782 2.124 1.000000
20 -97.585 1.200 1.881100 39.35
21 10.629 2.457 1.993396 28.92
22 30.804 Variable 1.000000

* 23 24.645 2.816 1.593190 67.90
24 -36.143 Variable 1.000000

25 -1303.485 3.950 1.602810 40.36
26 -8.782 1.200 1.897219 38.51
27 -45.532 BF 1.000000
Image plane ∞

[Aspherical data]
Surface number κ A4 A6 A8 A10
6 1 1.59E-05 -5.02E-08 1.14E-10 9.01E-12
23 1 -4.32E-05 2.52E-07

[Various data]
Scaling ratio 9.42

W M T
f 10.30 50.00 97.00
FNO 3.50 5.17 5.63
2ω 79.71 ° 18.02 ° 9.43 °
Y 8.190 8.190 8.190
TL 89.33 125.31 140.86
BF 13.25 33.66 41.71

W M T
d5 2.328 34.196 44.867
d13 19.888 5.725 2.400
d22 6.801 3.500 3.502
d24 0.100 1.265 1.411

[Lens group data]
Group start surface f
1 1 77.2
2 6 -9.3
3 14 20.3
4 23 25.1
5 25 -72.1

[Conditional expression values]
(1) f1 / (− f2) = 8.34
(2) f3 / f4 = 0.82
(3) f1 / f3 = 3.76
(4) f1 / f4 = 3.07
(5) | f32 | /f1=0.42
(6) (−f2) /f3=0.45

17 (a), 17 (b), and 17 (c) respectively show infinity in the wide-angle end state, the intermediate focal length state, and the telephoto end state of the variable magnification optical system according to the sixth example of the present application. It is an aberration diagram at the time of focusing on an object.
18 (a) and 18 (b) respectively show anti-vibration against rotation blur of 0.60 ° when focusing on an object at infinity in the wide-angle end state of the variable magnification optical system according to the sixth example of the present application. FIG. 6 is a meridional lateral aberration diagram when performing the zooming, and a meridional lateral aberration diagram when performing anti-vibration with respect to a rotational shake of 0.19 ° when focusing on an object at infinity in the telephoto end state.
From each aberration diagram, the variable magnification optical system according to the present example has excellent imaging performance by satisfactorily correcting various aberrations from the wide-angle end state to the telephoto end state. It can be seen that it has image performance.

According to each of the above-described embodiments, the light weight and small size have a vibration isolating function, a high zoom ratio of about 10 times, a wide angle of view of 70 ° or more in the wide angle end state, and good optical performance. A variable magnification optical system can be realized. 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 adopted as appropriate as long as the optical performance of the variable magnification optical system of the present application is not impaired.
As numerical examples of the variable magnification optical system of the present application, a four-group or five-group configuration is shown. However, the present application is not limited to this, and for example, a variable-magnification optical system having another group configuration such as six groups may be configured. it can. 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 variable magnification optical system of the present application may be used. The lens group refers to a portion having at least one lens separated from other lens groups by an air interval that changes during zooming.

In addition, the variable magnification optical system of the present application uses a part of a lens group, an entire lens group, or a plurality of lens groups as a focusing lens group for focusing from an object at infinity to a near object. It is good also as a structure moved to an axial direction. In particular, it is preferable that at least a part of the second 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.
Further, in the variable magnification optical system of the present application, any lens group or a part thereof is moved as a vibration-proof lens group so as to include a component in a direction perpendicular to the optical axis, or a surface including the optical axis A configuration in which image blur caused by camera shake or the like is corrected by rotationally moving (swinging) inward is also possible. In particular, in the variable magnification optical system 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 variable magnification optical system 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 variable magnification optical system of the present application, it is preferable that the aperture stop be disposed between the second lens group and the third lens group or in the third lens group. It is good also as composition which substitutes.
Further, an antireflection film having a high transmittance in a wide wavelength range may be applied to the lens surface of the lens constituting the variable magnification optical system of the present application. Thereby, flare and ghost can be reduced, and high optical performance with high contrast can be achieved.
The variable magnification optical system of the present application has a variable magnification ratio of about 3 to 20.

Next, a camera provided with the variable magnification optical system of the present application will be described with reference to FIG.
FIG. 19 is a diagram illustrating a configuration of a camera including the variable magnification optical system of the present application.
The camera 1 is a digital single-lens reflex camera provided with the variable magnification optical system according to the first embodiment as the photographing lens 2.
In the camera 1, light from an object (subject) (not shown) is collected by the taking lens 2 and imaged on the focusing screen 4 through the quick return mirror 3. The light imaged on the focusing screen 4 is reflected in the pentaprism 5 a plurality of times and guided to the eyepiece lens 6. Thus, the photographer can observe the subject image as an erect image through the eyepiece 6.

When the release button (not shown) is pressed by the photographer, the quick return mirror 3 is retracted out of the optical path, and light from the subject (not shown) reaches the image sensor 7. Thereby, the light from the subject is picked up by the image pickup device 7 and recorded as a subject image in a memory (not shown). In this way, the photographer can shoot the subject with the camera 1.
Here, the variable magnification optical system according to the first example mounted on the camera 1 as the photographing lens 2 is small as described above, has a vibration isolation function, has a high variable magnification, a wide angle of view, and is good. With excellent optical performance. As a result, the camera 1 has an anti-vibration function and can achieve good optical performance while achieving high zoom ratio, wide angle of view, and miniaturization. Even if a camera equipped with the variable magnification optical system according to the second to sixth examples as the photographing lens 2 is configured, the same effect as the camera 1 can be obtained. In addition, even when the zoom optical system according to each of the above embodiments is mounted on a camera having a configuration that does not include the quick return mirror 3, the same effects as those of the camera 1 can be obtained.

Finally, the outline of the manufacturing method of the variable magnification optical system of this application is demonstrated based on FIG.
The variable magnification optical system manufacturing method shown in FIG. 20 has, 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 positive refractive power. A method for manufacturing a variable magnification optical system having a third lens group and a fourth lens group having a positive refractive power, and includes the following steps S1 to S4.
Step S1: The third lens group includes, in order from the object side, a first partial group having a positive refractive power and a second partial group.
Step S2: The first lens group and the second lens group satisfy the following conditional expression (1), and the first to fourth lens groups are sequentially arranged in the lens barrel from the object side.
(1) 8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group

Step S3: By providing a known moving mechanism in the lens barrel, for example, when changing magnification from the wide-angle end state to the telephoto end state, the air gap between the first lens group and the second lens group, the second lens group, The air gap between the third lens group and the air gap between the third lens group and the fourth lens group are changed.
Step S4: By providing a known moving mechanism in the lens barrel, the second partial group is moved so as to include a component in a direction orthogonal to the optical axis.
According to the manufacturing method of the variable magnification optical system of the present application, it is possible to manufacture a small variable magnification optical system having an anti-vibration function, a high variable magnification, a wide angle of view, and good optical performance. .

G1 1st lens group G2 2nd lens group G3 3rd lens group G4 4th lens group G5 5th lens group G31 1st partial group G32 2nd partial group G33 3rd partial group S Aperture stop I Image surface

Claims (12)

In order from the object 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 having a positive refractive power And having a group
Upon zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group changes,
The third lens group includes, in order from the object side, a first partial group having a positive refractive power and a second partial group.
The second subgroup moves to include a component in a direction perpendicular to the optical axis;
A zoom optical system characterized by satisfying the following conditional expression:
8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group   The variable magnification optical system according to claim 1, wherein the second partial group has a negative refractive power. The zoom lens system according to claim 1 or 2, wherein the following conditional expression is satisfied.
0.60 <f3 / f4 <0.90
However,
f3: focal length of the third lens group f4: focal length of the fourth lens group The zoom lens system according to any one of claims 1 to 3, wherein the following conditional expression is satisfied.
2.80 <f1 / f3 <4.50
However,
f1: Focal length of the first lens group f3: Focal length of the third lens group The zoom lens system according to claim 1, wherein the following conditional expression is satisfied.
2.20 <f1 / f4 <3.50
However,
f1: Focal length of the first lens group f4: Focal length of the fourth lens group   6. The variable magnification optical system according to claim 1, wherein at the time of focusing, at least a part of the second lens group moves in an optical axis direction. The zoom lens system according to any one of claims 1 to 6, wherein the following conditional expression is satisfied.
0.20 <| f32 | / f1 <0.43
However,
f1: focal length of the first lens group f32: focal length of the second partial group   The variable power optical system according to any one of claims 1 to 7, wherein the second partial group includes a cemented lens including one positive lens and one negative lens. The variable magnification optical system according to claim 1, wherein the following conditional expression is satisfied.
0.35 <(-f2) / f3 <0.55
However,
f2: focal length of the second lens group f3: focal length of the third lens group   10. The zoom optical system according to claim 1, wherein the first lens unit moves in the optical axis direction during zooming from the wide-angle end state to the telephoto end state.   An optical apparatus comprising the variable magnification optical system according to any one of claims 1 to 10. In order from the object 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 having a positive refractive power A variable magnification optical system having a group,
The third lens group includes, in order from the object side, a first partial group having a positive refractive power and a second partial group.
The first lens group and the second lens group satisfy the following conditional expression:
Upon zooming from the wide-angle end state to the telephoto end state, the distance between the first lens group and the second lens group, the distance between the second lens group and the third lens group, and the third lens group The distance from the fourth lens group changes,
A method of manufacturing a variable magnification optical system, wherein the second partial group moves so as to include a component in a direction orthogonal to the optical axis.
8.00 <f1 / (-f2) <10.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group

Images