JP5321608B2 - Variable magnification optical system, optical device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable magnification optical system that satisfactorily suppresses aberration fluctuation in varying magnification, an optical device, and a method for manufacturing the variable magnification optical system. <P>SOLUTION: A variable magnification 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, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power. When magnification is varied from a wide angle end state to a telephoto end state, a position of the first lens group G1 is not changed, and at least part of any one of the lens groups G1-G5 is moved so as to include a component in a direction perpendicular to an optical axis. The variable magnification optical system satisfies a predetermined conditional expression. <P>COPYRIGHT: (C)2012,JPO&amp;INPIT

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 2001-124992 A

However, the conventional variable magnification optical system has a problem that aberration variation at the time of variable magnification is large.
Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a variable magnification optical system, an optical device, and a method for manufacturing the variable magnification optical system, in which aberration fluctuation at the time of variable magnification is satisfactorily suppressed. .

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 negative refractive power The lens group and the fifth lens group having a positive refractive power substantially consist of five lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the position of the first lens group is fixed,
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
0.57 ≦ f2 / f4 ≦ 0.73
0.20 <(− f2) / f5 <0.50
However,
f2: focal length of the second lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group
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 negative refractive power The lens group and the fifth lens group having a positive refractive power substantially consist of five lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the position of the first lens group is fixed,
The first lens group includes a cemented positive lens of a negative lens and a positive lens, and a single lens having a positive refractive power,
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
0.57 ≦ f2 / f4 <1.00
0.20 <(− f2) / f5 <0.50
However,
f2: focal length of the second lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group
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 negative refractive power The lens group and the fifth lens group having a positive refractive power substantially consist of five lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the position of the first lens group is fixed,
The first lens group includes a cemented positive lens of a negative lens and a positive lens, and a single lens having a positive refractive power,
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
A variable magnification optical system characterized by satisfying the following conditional expression is provided.
0.51 ≦ f2 / f4 <1.00
0.20 <(− f2) / f5 <0.50
3.20 <f1 / f3 <5.00
However,
f1: Focal length of the first lens group
f2: Focal length of the second lens group
f3: focal length of the third lens group
f4: focal length of the fourth lens group
f5: focal length of the fifth lens group

The present invention also provides
Provided is an optical device comprising the variable magnification optical system .

  According to the present invention, it is possible to provide a variable magnification optical system, an optical device, and a method for manufacturing the variable magnification optical system that can satisfactorily suppress aberration fluctuations during variable magnification.

It is a figure which shows the lens structure of the variable magnification optical system which concerns on 1st Example of this application. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the first example, and anti-vibration with respect to 0.2 ° rotational blur. It is a meridional lateral aberration diagram when it is performed. (A) and (b) are various aberration diagrams at the time of focusing on infinity in the intermediate focal length state of the variable magnification optical system according to the first example, and anti-vibration with respect to 0.2 ° rotational shake. It is a meridional transverse aberration diagram when performing. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the first example, and anti-vibration against rotation blur of 0.2 °. It is a meridional lateral aberration diagram when it is performed. (A), (b), and (c) are various aberration diagrams at the time of short-distance focusing 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. . It is a figure which shows the lens structure of the variable magnification optical system which concerns on 2nd Example of this application. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the second example, and anti-vibration with respect to 0.2 ° rotational shake. It is a meridional lateral aberration diagram when it is performed. (A) and (b) are various aberration diagrams at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the second example, and anti-vibration against rotation blur of 0.2 °, respectively. It is a meridional transverse aberration diagram when performing. (A) and (b) respectively show various aberration diagrams at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the second example, and anti-vibration against 0.2 ° rotation blur. It is a meridional lateral aberration diagram when it is performed. (A), (b), and (c) are various aberration diagrams at the time of short-distance focusing in the wide-angle end state, intermediate focal length state, and telephoto end state of the variable magnification optical system according to the second example. . It is a figure which shows the lens structure of the variable magnification optical system which concerns on 3rd Example of this application. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the third example, and anti-vibration against rotation blur of 0.2 °. It is a meridional lateral aberration diagram when it is performed. (A) and (b) are various aberration diagrams at the time of focusing on infinity in the intermediate focal length state of the variable magnification optical system according to the third example, and anti-vibration against rotation blur of 0.2 °, respectively. It is a meridional transverse aberration diagram when performing. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the third example, and anti-vibration against rotation blur of 0.2 °. It is a meridional lateral aberration diagram when it is performed. (A), (b), and (c) are various aberration diagrams at the time of focusing at a short distance 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. . It is a figure which shows the lens structure of the variable magnification optical system which concerns on 4th Example of this application. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the fourth example, and anti-vibration with respect to 0.2 ° rotational shake. It is a meridional lateral aberration diagram when it is performed. (A) and (b) are various aberration diagrams at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the fourth example, and anti-vibration against rotation blur of 0.2 °, respectively. It is a meridional transverse aberration diagram when performing. (A) and (b) respectively show various aberration diagrams at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the fourth example, and anti-vibration against rotation blur of 0.2 °. It is a meridional lateral aberration diagram when it is performed. (A), (b), and (c) are various aberration diagrams at the time of short-distance focusing 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. . It is a figure which shows the lens structure of the variable magnification optical system which concerns on 5th Example of this application. (A) and (b) respectively show various aberration diagrams at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the fifth example, and anti-vibration against 0.2 ° rotational shake. It is a meridional lateral aberration diagram when it is performed. (A) and (b) are diagrams showing various aberrations during focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the fifth example, and anti-vibration against rotation blur of 0.2 °, respectively. It is a meridional transverse aberration diagram when performing. (A) and (b) respectively show various aberration diagrams at the time of focusing at infinity in the telephoto end state of the variable magnification optical system according to the fifth example, and anti-vibration with respect to 0.2 ° rotational shake. It is a meridional lateral aberration diagram when it is performed. (A), (b), and (c) are various aberration diagrams at the time of focusing at a short distance 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. . It is a figure which shows the lens structure of the variable magnification optical system which concerns on 6th Example of this application. (A) and (b) are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the sixth example, and anti-vibration against 0.2 ° rotational shake. It is a meridional lateral aberration diagram when it is performed. (A) and (b) are various aberration diagrams at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the sixth example, and anti-vibration against rotation blur of 0.2 °, respectively. It is a meridional transverse aberration diagram when performing. (A) and (b) are diagrams showing various aberrations during focusing at infinity in the telephoto end state of the variable magnification optical system according to the sixth example, and anti-vibration with respect to 0.2 ° rotational shake. It is a meridional lateral aberration diagram when it is performed. (A), (b), and (c) are various aberration diagrams at the time of focusing at a short distance 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. . 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 manufacturing method of the variable magnification optical system of this application.

Hereinafter, the variable magnification optical system, the optical apparatus, and the 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 negative lens power. A fourth lens group having a refractive power of 5 and a fifth lens group having a positive refractive power, and the position of the first lens group is fixed during zooming from the wide-angle end state to the telephoto end state. The lens group is moved so that at least a part of any one of the lens groups includes a component in a direction orthogonal to the optical axis, and satisfies the following conditional expressions (1) and (2): And
(1) 0.44 <f2 / f4 <1.00
(2) 0.20 <(− f2) / f5 <0.50
However,
f2: focal length of the second lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group

The variable magnification optical system of the present application can simplify the drive mechanism for variable magnification by fixing the position of the first lens group, thereby reducing the size of the lens barrel.
Conditional expression (1) defines an appropriate focal length of the second lens group with respect to the focal length of the fourth lens group. By satisfying conditional expression (1), the variable magnification optical system of the present application can satisfactorily correct coma and field curvature in the wide-angle end state, and can prevent an increase in the size of the lens barrel.
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 second lens group increases, so it is difficult to correct coma and curvature of field in the wide-angle end state. It becomes. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (1) to 0.50.
On the other hand, when the corresponding value of the conditional expression (1) of the variable magnification optical system of the present application exceeds the upper limit value, the refractive power of the second lens group decreases and the outer diameter of the first lens group increases. As a result, the size of the lens barrel is increased. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (1) to 0.85.

Conditional expression (2) defines an appropriate focal length of the second lens group with respect to the focal length of the fifth lens group. By satisfying conditional expression (2), the variable magnification optical system of the present application can satisfactorily correct field curvature, distortion, and coma in the wide-angle end state, and prevent an increase in the size of the lens barrel. be able to.
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 second lens group increases, so it is difficult to correct coma and curvature of field in the wide-angle end state. It becomes. In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (2) to 0.25.
On the other hand, 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 second lens group decreases and the outer diameter of the first lens group increases. In addition, since the refractive power of the fifth lens group is increased, it is difficult to correct curvature of field and distortion. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (2) to 0.48.
With the above configuration, it is possible to realize a variable magnification optical system that satisfactorily suppresses fluctuations in aberrations during variable magnification.

Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (3).
(3) 3.00 <f1 / f3 <5.00
However,
f1: Focal length of the first lens group f3: Focal length of the third lens group

Conditional expression (3) defines an appropriate focal length of the first lens group with respect to the focal length of the third lens group. The variable magnification optical system of the present application can satisfactorily correct spherical aberration and lateral chromatic aberration in the telephoto end state by satisfying conditional expression (3).
If the corresponding value of conditional expression (3) of the variable magnification optical system of the present application is less than the lower limit value, the refractive power of the first lens group increases, and it becomes difficult to correct spherical aberration and lateral chromatic aberration in the telephoto end state. . In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (3) to 3.20.
On the other hand, if the corresponding value of the conditional expression (3) of the variable magnification optical system of the present application exceeds the upper limit value, the refractive power of the third lens unit increases, and it becomes difficult to correct spherical aberration. In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (3) to 4.50.

Moreover, it is desirable that the variable magnification optical system of the present application satisfies the following conditional expression (4).
(4) 2.00 <f1 / (− f4) <5.00
However,
f1: Focal length of the first lens group f4: Focal length of the fourth lens group

Conditional expression (4) defines an appropriate focal length of the first lens group with respect to the focal length of the fourth lens group. The variable magnification optical system of the present application can satisfactorily correct field curvature and astigmatism, and spherical aberration and lateral chromatic aberration in the telephoto end state by satisfying conditional expression (4). Can be prevented.
If the corresponding value of conditional expression (4) of the variable magnification optical system of the present application is below the lower limit value, the refractive power of the first lens group becomes large, and it becomes difficult to correct spherical aberration and lateral chromatic aberration in the telephoto end state. . In addition, the effect of this application can be made more reliable by setting the lower limit of conditional expression (4) to 2.40.
On the other hand, if the corresponding value of 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 group increases, and it becomes difficult to correct field curvature and astigmatism. . In addition, the effect of this application can be made more reliable by setting the upper limit of conditional expression (4) to 4.80.

In the variable magnification optical system of the present application, it is desirable that the fourth lens group moves when focusing from an object at infinity to a near object. With this configuration, it is possible to perform rapid focusing, and it is possible to reduce field angle fluctuation and spherical aberration fluctuation during focusing.
In the zoom optical system of the present application, it is desirable that the position of the third lens group is fixed when zooming from the wide-angle end state to the telephoto end state. With this configuration, since the number of lens groups that move during zooming can be reduced, the driving mechanism for zooming can be simplified. In particular, when the configuration is such that at least a part of the third lens group is moved so as to include a component in a direction orthogonal to the optical axis, the position of the moving mechanism can be fixed at the time of zooming. Can be miniaturized.

In the variable power optical system of the present application, it is preferable that at least a part of the third lens group moves so as to include a component in a direction orthogonal to the optical axis. With this configuration, the moving mechanism can be reduced in size.
In the variable power optical system of the present application, it is desirable that the distance between the lens groups is changed during zooming from the wide-angle end state to the telephoto end state. With this configuration, fluctuations in spherical aberration and field curvature during zooming can be reduced.
In the variable power optical system of the present application, it is desirable to have an aperture stop between the second lens group and the fourth lens group. With this configuration, coma and curvature of field can be favorably corrected.

  The optical apparatus of the present application is characterized by including the variable magnification optical system having the above-described configuration. Thereby, it is possible to realize an optical device in which aberration fluctuation at the time of zooming is suppressed satisfactorily.

In addition, 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 having a positive refractive power. And a fourth lens group having negative refracting power and a fifth lens group having positive refracting power, a method of manufacturing a variable magnification optical system, wherein the second lens group and the fourth lens group The fifth lens group satisfies the following conditional expressions (1) and (2), and the position of the first lens group is fixed at the time of zooming from the wide-angle end state to the telephoto end state. In the lens group, at least a part of any one of the lens groups is moved so as to include a component in a direction orthogonal to the optical axis.
(1) 0.44 <f2 / f4 <1.00
(2) 0.20 <(− f2) / f5 <0.50
However,
f2: Focal length of the second lens group f4: Focal length of the fourth lens group f5: Focal length of the fifth lens group The aberration variation at the time of zooming is changed by the manufacturing method of the zooming optical system of the present application. It is possible to manufacture a variable magnification optical system that is well suppressed.

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)
FIG. 1 is a diagram showing a lens configuration of a variable magnification optical system according to the first example of the present application.
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 an aperture stop S, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

The first lens group G1 includes, in order from the object side, a cemented positive lens including a negative meniscus lens L11 having a convex surface directed toward the object side and a positive meniscus lens L12 having a convex surface directed toward the object side, and a positive lens having a convex surface directed toward the object side. And a meniscus lens L13.
The second lens group G2 includes, in order from the object side, 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 biconcave negative lens L24. It consists of.
The third lens group G3 includes, in order from the object side, a cemented positive lens of a negative meniscus lens L31 having a convex surface directed toward the object side and a biconvex positive lens L32, and a negative meniscus lens L33 having a convex surface directed toward the object side. It consists of a cemented negative lens with a biconvex positive lens L34 and a biconvex positive lens L35.
The fourth lens group G4 includes, in order from the object side, a biconcave negative lens L41, and a cemented negative lens composed of a biconcave negative lens L42 and a biconvex positive lens L43.
The fifth lens group G5 includes, in order from the object side, a biconvex positive lens L51, a cemented positive lens composed of a negative meniscus lens L52 having a convex surface directed toward the object side, and a biconvex positive lens L53, and a biconvex shape. Positive lens L54 and a negative meniscus lens L55 having a concave surface facing the object side.

In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 and the second lens group G2 and the third lens group G3 during zooming from the wide-angle end state to the telephoto end state. , The fourth lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The groups G2, G4, and G5 move in the optical axis direction. At this time, the positions of the first and third lens groups G1 and G3 and the aperture stop S are fixed.
In the variable magnification optical system according to the present example, the cemented positive lens of the negative meniscus lens L31 and the positive lens L32 in the third lens group G3 includes a component in a direction perpendicular to the optical axis as a vibration-proof lens group. Accordingly, image blur can be corrected.
In the zoom optical system according to the present embodiment, focusing from a long-distance object to a short-distance object is performed by moving the entire fourth lens group G4 to the image side.

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 lens surfaces counted from the object side, r is the radius of curvature of the lens surfaces, d is the distance between the lens surfaces, nd is the refractive index with respect to the d-line (wavelength λ = 587.6 nm), νd represents the Abbe number for the d-line (wavelength λ = 587.6 nm). Further, the object plane indicates the object plane, the variable indicates the variable plane spacing, the (aperture S) indicates the aperture stop S, and the image plane indicates the image plane I. The radius of curvature r = ∞ indicates a plane, and the description of the refractive index nd of air = 1.000 is omitted.

[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−K (h / r) ² } ^1/2 ]
+ A4h ⁴ + A6h ⁶ + A8h ⁸ + A10h ¹⁰ + A12h ¹² + A14h ¹⁴
Here, x is a distance (sag amount) along the optical axis direction from the tangent plane of each aspherical surface at a height h in the vertical direction from the optical axis, K is a conic constant, and A4, A6, A8, A10, A12. , A14 is the aspheric coefficient, and r is the radius of curvature of the reference sphere (paraxial radius of curvature). “E−n” (n: integer) represents “× 10 ⁻ⁿ ”, for example “1.234E-05” represents “1.234 × 10 ⁻⁵ ”.

In [various data], FNO is the F number, 2ω is the angle of view, Y is the image height, TL is the total length of the optical system, and di (i: integer) is the variable surface interval of the i-th surface. Note that W is the wide-angle end state, M is the intermediate focal length state, T is the telephoto end state, infinity is when focusing on an object at infinity, and short distance indicates when focusing on a near object.
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 the 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 at the time of blur correction) 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 an anti-vibration coefficient of 0.86 and a focal length of 10.3 (mm) in the wide-angle end state. The moving amount of the anti-vibration lens group is 0.04 (mm). Further, in the intermediate focal length state, the image stabilization coefficient is 1.23 and the focal length is 45.0 (mm). .13 (mm). Further, in the telephoto end state, since the image stabilization coefficient is 1.42 and the focal length is 97.0 (mm), the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotation blur is 0. 24 (mm).

(Table 1) First Example
[Surface data]
Surface number r d nd νd
Object ∞
1 74.1356 1.800 1.850260 32.35
2 36.0351 7.000 1.497820 82.51
3 3038.1597 0.100
4 36.3362 5.000 1.729157 54.66
5 170.0064 Variable * 6 159.7676 1.000 1.816000 46.62
7 11.1111 5.757
8 -57.3031 0.800 1.816000 46.62
9 32.0791 0.202
10 18.8298 4.000 1.846660 23.78
11 -127.9381 0.317
12 -90.0599 1.000 1.816000 46.62
13 41.7316 Variable
14 22.5107 0.800 1.834000 37.16
15 12.0861 2.500 1.603001 65.46
16 -69.1710 1.000
17 864.1596 1.000 1.850260 32.35
18 16.8557 2.200 1.603001 65.46
19 -47.4738 0.100
20 24.2921 1.800 1.729157 54.66
21 -67.1681 1.000
22 (Aperture S) ∞ Variable
23 -43.6868 0.800 1.834807 42.72
24 22.6901 0.800
25 -25.0831 0.800 1.834807 42.72
26 11.7100 1.800 1.846660 23.78
27 -48.7106 Variable
28 24.1884 2.500 1.497820 82.51
29 -58.4609 0.200
30 40.9485 1.000 1.834807 42.72
31 15.4156 3.500 1.497820 82.51
32 -46.0872 8.564
33 28.3973 2.500 1.497820 82.51
34 -123.1319 3.765
35 -20.5259 1.000 1.846660 23.78
36 -54.7499 BF
Image plane ∞

[Aspherical data]
6th surface K = -20.0000
A4 = 4.26826E-06
A6 = -9.97395E-09
A8 = 1.52813E-11
A10 = -3.70867E-14

[Various data]
Scaling ratio 9.42
W M T
f 10.3 45.0 97.0
FNO 4.6 5.1 5.9
2ω 78.3 19.6 9.2
Y 8.0 8.0 8.0
TL 128.784 128.784 128.784
BF 18.391 18.023 15.384

W M T W M T
Infinity infinity infinity infinity short distance short distance short distance
d5 0.800 20.355 28.029 0.800 20.355 28.029
d13 28.052 8.497 0.823 28.052 8.497 0.823
d22 0.800 8.210 13.112 0.855 8.379 13.439
d27 16.136 9.093 6.831 16.081 8.924 6.503

[Lens group data]
Group start surface f
1 1 57.577
2 6 -10.550
3 14 16.309
4 23 -14.362
5 28 24.289

[Conditional expression values]
(1) f2 / f4 = 0.73
(2) (−f2) /f5=0.43
(3) f1 / f3 = 3.53
(4) f1 / (− f4) = 4.01

FIGS. 2A and 2B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the first example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 3A and 3B are graphs showing various aberrations at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the first example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when image stabilization is performed.
FIGS. 4A and 4B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the first example and a rotational shake of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
5 (a), 5 (b), and 5 (c) respectively show the close-up focus 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. FIG.

2 to 5, FNO indicates an F number, A indicates a half angle of view, and H0 indicates an object height. The spherical aberration diagram shows the F-number value corresponding to the maximum aperture, the astigmatism diagram and the distortion diagram show the half field angle or the maximum object height, and the coma diagram shows each half field angle or each Indicates the value of the object height. d represents a d-line (λ = 587.6 nm), and g represents a 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 example are also used in the aberration diagrams of the examples shown below.
From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance with excellent correction of various aberrations from the wide-angle end state to the telephoto end state, and also excellent during vibration isolation. It can be seen that it has imaging performance.

(Second embodiment)
FIG. 6 is a diagram showing a lens configuration of a variable magnification optical system according to the second example of the present application.
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, an aperture stop S, and a positive refraction. The lens unit includes a third lens group G3 having power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power.

The first lens group G1 includes, in order from the object side, a cemented positive lens composed 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. Consists of.
The second lens group G2 includes, in order from the object side, 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 biconcave negative lens L24. It consists of.
The third lens group G3 includes, in order from the object side, a cemented positive lens composed of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a concave surface facing the object side. And a positive lens cemented with a negative meniscus lens L34.
The fourth lens group G4 includes, in order from the object side, a biconcave negative lens L41, and a cemented negative lens composed of a biconcave negative lens L42 and a biconvex positive lens L43.
The fifth lens group G5 includes, in order from the object side, a positive meniscus lens L51 having a concave surface directed toward the object side, a cemented positive lens composed of a negative meniscus lens L52 having a convex surface directed toward the object side, and a biconvex positive lens L53. And a positive biconvex lens L54, and a negative meniscus lens L55 having a concave surface facing the object side.

In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 and the second lens group G2 and the third lens group G3 during zooming from the wide-angle end state to the telephoto end state. , The fourth lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The groups G2, G4, and G5 move in the optical axis direction. At this time, the positions of the first and third lens groups G1 and G3 and the aperture stop S are fixed.
Further, in the variable magnification optical system according to the present example, the entire third lens group G3 moves as an anti-vibration lens group so as to include a component in a direction orthogonal to the optical axis, and thereby image blur can be corrected. .
In the zoom optical system according to the present embodiment, focusing from a long-distance object to a short-distance object is performed by moving the entire fourth lens group G4 to the image side.

Table 2 below provides values of specifications of the variable magnification optical system according to the present example.
Here, since the zoom optical system according to the present example has an image stabilization coefficient of 2.07 and a focal length of 10.3 (mm) in the wide-angle end state, it corrects rotational shake of 0.2 °. The amount of movement of the anti-vibration lens group is 0.02 (mm). Further, in the intermediate focal length state, the image stabilization coefficient is 2.95, and the focal length is 45.0 (mm), so the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. .05 (mm). Further, in the telephoto end state, since the image stabilization coefficient is 3.42 and the focal length is 97.0 (mm), the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. 10 (mm).

(Table 2) Second Example
[Surface data]
Surface number r d nd νd
Object ∞
1 93.1619 1.800 1.850260 32.35
2 39.5859 8.000 1.497820 82.51
3 -284.0151 0.100
4 36.5540 5.000 1.729157 54.66
5 159.4459 Variable * 6 127.6881 1.000 1.816000 46.62
7 12.0348 5.060
8 -49.9978 0.800 1.816000 46.62
9 29.2932 0.200
10 18.9882 4.000 1.846660 23.78
11 -37.9737 0.471
12 -28.9543 1.000 1.834807 42.72
13 48.3879 Variable
14 (Aperture S) ∞ 0.000
15 37.6996 0.800 1.834000 37.16
16 17.4219 2.500 1.593190 67.90
17 -25.8437 0.100
18 20.8989 2.500 1.518601 69.97
19 -16.6811 0.800 1.846660 23.78
20 -31.8438 Variable
21 -36.4910 0.800 1.834807 42.72
22 29.3199 0.896
23 -27.0631 0.800 1.834807 42.72
24 18.2268 1.800 1.846660 23.78
25 -34.6409 Variable
26 -50.1069 2.000 1.497820 82.51
27 -19.1363 0.200
28 96.2015 1.000 1.834807 42.72
29 23.1567 4.000 1.497820 82.51
30 -46.1208 0.211
31 23.5512 3.000 1.497820 82.51
32 -152.9275 9.791
33 -37.8588 1.000 1.846660 23.78
34 -283.7365 BF
Image plane ∞

[Aspherical data]
6th surface K = 8.8617
A4 = 1.80790E-07
A6 = -6.06139E-09
A8 = 4.62589E-11
A10 = -2.20120E-13

[Various data]
Scaling ratio 9.42
W M T
f 10.3 45.0 97.0
FNO 4.7 5.3 6.1
2ω 78.3 19.4 9.1
Y 8.0 8.0 8.0
TL 128.784 128.784 128.784
BF 19.429 17.659 14.429

W M T W M T
Infinity infinity infinity infinity short distance short distance short distance
d5 0.800 20.665 28.181 0.800 20.665 28.181
d13 29.606 9.740 2.225 29.606 9.740 2.225
d20 0.800 9.620 15.486 0.855 9.821 15.897
d25 18.520 11.469 8.834 18.465 11.268 8.423

[Lens group data]
Group start surface f
1 1 57.030
2 6 -10.449
3 15 16.471
4 21 -18.248
5 26 28.038

[Conditional expression values]
(1) f2 / f4 = 0.57
(2) (−f2) /f5=0.37
(3) f1 / f3 = 3.46
(4) f1 / (− f4) = 3.13

FIGS. 7A and 7B are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the second example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 8A and 8B are diagrams showing various aberrations at the time of focusing at infinity in the intermediate focal length state of the variable magnification optical system according to the second example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when image stabilization is performed.
FIGS. 9A and 9B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the variable magnification optical system according to the second example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
10 (a), 10 (b), and 10 (c), respectively, are in close focus at 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. FIG.
From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance with excellent correction of various aberrations from the wide-angle end state to the telephoto end state, and also excellent during vibration isolation. It can be seen that it has imaging performance.

(Third embodiment)
FIG. 11 is a diagram showing a lens configuration of a variable magnification optical system according to the third example of the present application.
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, an aperture stop S, and a positive refraction. The lens unit includes a third lens group G3 having power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having positive refractive power.

The first lens group G1 includes, in order from the object side, a cemented positive lens composed 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. Consists of.
The second lens group G2 includes, in order from the object side, 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 biconcave negative lens L24. It consists of.
The third lens group G3 includes, in order from the object side, a cemented positive lens composed of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a concave surface facing the object side. And a positive lens cemented with a negative meniscus lens L34.
The fourth lens group G4 includes, in order from the object side, a biconcave negative lens L41, and a cemented negative lens composed of a biconcave negative lens L42 and a biconvex positive lens L43.
The fifth lens group G5 includes, in order from the object side, a biconvex positive lens L51, a cemented positive lens formed by a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object.

In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 and the second lens group G2 and the third lens group G3 during zooming from the wide-angle end state to the telephoto end state. , The fourth lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The groups G2, G4, and G5 move in the optical axis direction. At this time, the positions of the first and third lens groups G1 and G3 and the aperture stop S are fixed.
Further, in the variable magnification optical system according to the present example, the entire third lens group G3 moves as an anti-vibration lens group so as to include a component in a direction orthogonal to the optical axis, and thereby image blur can be corrected. .
In the zoom optical system according to the present embodiment, focusing from a long-distance object to a short-distance object is performed by moving the entire fourth lens group G4 to the image side.

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 2.08 and a focal length of 10.3 (mm) in the wide-angle end state, in order to correct a rotational shake of 0.2 °. The amount of movement of the anti-vibration lens group is 0.02 (mm). Further, in the intermediate focal length state, the image stabilization coefficient is 2.95, and the focal length is 45.0 (mm), so the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. .05 (mm). Further, in the telephoto end state, since the image stabilization coefficient is 3.42 and the focal length is 97.0 (mm), the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. 10 (mm).

(Table 3) Third Example
[Surface data]
Surface number r d nd νd
Object ∞
1 86.5566 1.600 1.850260 32.35
2 39.0403 8.200 1.497820 82.51
3 -273.4518 0.100
4 33.7862 4.800 1.729157 54.66
5 111.7851 Variable * 6 114.8189 1.000 1.816000 46.62
7 10.7372 5.676
8 -53.6644 0.800 1.816000 46.62
9 36.5687 0.200
10 17.8230 4.000 1.846660 23.78
11 -53.3504 0.342
12 -43.0589 1.000 1.834807 42.72
13 33.3093 Variable
14 (Aperture S) ∞ 0.000
15 32.7360 0.800 1.850260 32.35
16 15.8207 2.500 1.593190 67.90
17 -24.5965 0.100
18 22.9169 2.500 1.518601 69.97
19 -20.0347 0.800 1.846660 23.78
20 -37.9415 Variable
21 -31.8905 0.800 1.834807 42.72
22 31.4348 1.419
23 -16.4154 0.800 1.834807 42.72
24 39.1141 1.800 1.846660 23.78
25 -18.0688 Variable
26 67.8920 4.000 1.497820 82.51
27 -20.3825 4.416
28 32.0419 4.000 1.497820 82.51
29 -17.2951 1.000 1.850 260 32.35
30 -184.4460 BF
Image plane ∞

[Aspherical data]
6th surface K = 13.3663
A4 = -5.75816E-07
A6 = -3.00768E-10
A8 = -1.33166E-11
A10 = 2.80156E-14

[Various data]
Scaling ratio 9.42
W M T
f 10.3 45.0 97.0
FNO 4.7 5.3 6.1
2ω 78.1 19.5 9.1
Y 8.0 8.0 8.0
TL 128.784 128.784 128.784
BF 27.465 24.116 20.465

W M T W M T
Infinity infinity infinity infinity short distance short distance short distance
d5 0.810 20.266 27.547 0.810 20.266 27.547
d13 29.126 9.670 2.389 29.126 9.670 2.389
d20 0.801 10.534 16.510 0.855 10.738 16.927
d25 17.930 11.545 9.221 17.875 11.342 8.804

[Lens group data]
Group start surface f
1 1 55.688
2 6 -10.152
3 15 16.625
4 21 -20.042
5 26 30.416

[Conditional expression values]
(1) f2 / f4 = 0.51
(2) (−f2) /f5=0.33
(3) f1 / f3 = 3.35
(4) f1 / (− f4) = 2.78

FIGS. 12A and 12B are diagrams showing various aberrations at the time of focusing at infinity in the wide-angle end state of the variable magnification optical system according to the third example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 13A and 13B are graphs showing various aberrations at the time of focusing at infinity in the intermediate focal length state of the zoom optical system according to the third example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when image stabilization is performed.
FIGS. 14A and 14B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom optical system according to the third example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
15 (a), 15 (b), and 15 (c) respectively show the close-up focus 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. FIG.
From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance with excellent correction of various aberrations from the wide-angle end state to the telephoto end state, and also excellent during vibration isolation. It can be seen that it has imaging performance.

(Fourth embodiment)
FIG. 16 is a diagram showing a lens configuration of a variable magnification optical system according to the fourth example of the present application.
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 an aperture stop S, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

The first lens group G1 includes, in order from the object side, a cemented positive lens composed 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. Consists of.
The second lens group G2 includes, in order from the object side, 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 biconcave negative lens L24. This is a positive lens.
The third lens group G3 includes, in order from the object side, a cemented positive lens composed of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a concave surface facing the object side. And a negative positive meniscus lens L34, and a biconvex positive lens L35.
The fourth lens group G4 includes, in order from the object side, a biconcave negative lens L41, and a cemented negative lens composed of a biconcave negative lens L42 and a biconvex positive lens L43.
The fifth lens group G5 includes, in order from the object side, a biconvex positive lens L51, a cemented positive lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object, and an object side. It consists of a cemented negative lens of a negative meniscus lens L54 having a convex surface and a biconvex positive lens L55, and a negative meniscus lens L56 having a concave surface on the object side.

In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 and the second lens group G2 and the third lens group G3 during zooming from the wide-angle end state to the telephoto end state. , The fourth lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The groups G2, G4, and G5 move in the optical axis direction. At this time, the positions of the first and third lens groups G1 and G3 and the aperture stop S are fixed.
In the variable magnification optical system according to the present example, the cemented positive lens of the negative meniscus lens L31 and the positive lens L32 in the third lens group G3 includes a component in a direction perpendicular to the optical axis as a vibration-proof lens group. Accordingly, image blur can be corrected.
In the zoom optical system according to the present embodiment, focusing from a long-distance object to a short-distance object is performed by moving the entire fourth lens group G4 to the image side.

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 0.93 and a focal length of 10.3 (mm) in the wide-angle end state, in order to correct a rotational shake of 0.2 °. The amount of movement of the anti-vibration lens group is 0.04 (mm). Further, in the intermediate focal length state, since the image stabilization coefficient is 1.33 and the focal length is 45.0 (mm), the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. .12 (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 0.2 ° rotation blur is 0. 21 (mm).

(Table 4) Fourth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 102.3091 2.000 1.795040 28.69
2 41.8010 10.400 1.497820 82.57
3 -1007.6756 0.100
4 37.6062 5.150 1.834810 42.73
5 98.9884 Variable
* 6 99.2450 0.150 1.553890 38.09
7 94.6723 1.400 1.834810 42.73
8 12.0783 6.000
9 -32.7960 1.000 1.834810 42.73
10 46.9143 0.400
11 25.5606 3.800 1.846660 23.80
12 -54.2180 1.000 1.816000 46.59
13 54.1534 Variable
14 34.7874 0.800 1.850260 32.35
15 16.6502 2.600 1.618000 63.34
16 -37.1204 1.200
17 48.7843 2.600 1.497820 82.57
18 -18.5410 0.800 1.850 260 32.35
19 -41.7038 0.300
20 47.8525 1.600 1.696800 55.52
21 -59.5425 0.500
22 (Aperture S) ∞ Variable
23 -33.1327 0.800 1.816000 46.59
24 23.8736 0.700
25 -23.1424 0.800 1.816000 46.59
26 16.9872 2.000 1.808090 22.74
27 -33.9829 Variable
28 49.4602 3.500 1.589130 61.18
* 29 -19.7954 0.100
30 23.4122 4.400 1.497820 82.57
31 -23.4006 1.000 1.950000 29.37
32 -80.0819 0.300
33 85.4967 1.000 1.883000 40.66
34 14.9004 4.000 1.517420 52.20
35 -50.2458 1.450
36 -30.3940 1.000 2.000690 25.46
37 -82.9601 BF
Image plane ∞

[Aspherical data]
6th surface K = 15.1751
A4 = 4.64891E-06
A6 = -1.26998E-08
A8 = -3.35661E-10
A10 = 2.59761E-12
A12 = -8.51930E-15
A14 = 1.02560E-17

29th surface K = 1.2313
A4 = 1.39795E-05
A6 = 3.25121E-08

[Various data]
Scaling ratio 9.42
W M T
f 10.3 45.0 97.0
FNO 4.6 5.5 5.9
2ω 78.6 19.4 9.0
Y 8.0 8.0 8.0
TL 136.663 136.663 136.663
BF 21.775 17.923 14.148

W M T W M T
Infinity infinity infinity infinity short distance short distance short distance
d5 1.822 23.119 30.744 1.822 23.119 30.744
d13 30.318 9.021 1.396 30.318 9.021 1.396
d22 2.508 12.391 20.536 2.557 12.557 20.874
d27 17.391 11.359 6.988 17.341 11.193 6.650

[Lens group data]
Group start surface f
1 1 65.224
2 6 -10.504
3 14 16.830
4 23 -14.660
5 28 24.633

[Conditional expression values]
(1) f2 / f4 = 0.72
(2) (−f2) /f5=0.43
(3) f1 / f3 = 3.88
(4) f1 / (− f4) = 4.45

FIGS. 17A and 17B are graphs showing various aberrations at the time of focusing at infinity in the wide-angle end state of the zoom optical system according to the fourth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 18A and 18B are diagrams showing various aberrations at the time of focusing at infinity in the intermediate focal length state of the zoom optical system according to the fourth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when image stabilization is performed.
FIGS. 19A and 19B are graphs showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom optical system according to the fourth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
20 (a), 20 (b), and 20 (c), respectively, at the time of short distance focusing 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. FIG.
From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance with excellent correction of various aberrations from the wide-angle end state to the telephoto end state, and also excellent during vibration isolation. It can be seen that it has imaging performance.

(5th Example)
FIG. 21 is a diagram showing a lens configuration of a variable magnification optical system according to the fifth example of the present application.
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 an aperture stop S, a fourth lens group G4 having a negative refractive power, and a fifth lens group G5 having a positive refractive power.

The first lens group G1 includes, in order from the object side, a cemented positive lens composed 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. Consists of.
The second lens group G2 includes, in order from the object side, 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 biconcave negative lens L24. This is a positive lens.
The third lens group G3 includes, in order from the object side, a cemented positive lens composed of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, and a biconvex positive lens L33 and a concave surface facing the object side. And a negative positive meniscus lens L34, and a biconvex positive lens L35.
The fourth lens group G4 includes, in order from the object side, a biconcave negative lens L41, and a cemented negative lens composed of a biconcave negative lens L42 and a biconvex positive lens L43.
The fifth lens group G5 includes, in order from the object side, a biconvex positive lens L51, a cemented positive lens composed of a biconvex positive lens L52 and a negative meniscus lens L53 having a concave surface facing the object, and an object side. It consists of a cemented negative lens of a negative meniscus lens L54 having a convex surface and a biconvex positive lens L55, and a negative meniscus lens L56 having a concave surface on the object side.

In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 and the second lens group G2 and the third lens group G3 during zooming from the wide-angle end state to the telephoto end state. , The fourth lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The groups G2, G4, and G5 move in the optical axis direction. At this time, the positions of the first and third lens groups G1 and G3 and the aperture stop S are fixed.
Further, in the variable magnification optical system according to the present example, the entire second lens group G2 moves so as to include a component in a direction perpendicular to the optical axis as an anti-vibration lens group, and thereby image blur can be corrected. .
In the zoom optical system according to the present embodiment, focusing from a long-distance object to a short-distance object is performed by moving the entire fourth lens group G4 to the image side.

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 0.85 and a focal length of 10.3 (mm) in the wide-angle end state, it corrects rotational shake of 0.2 °. The amount of movement of the anti-vibration lens group is 0.04 (mm). Further, in the intermediate focal length state, since the vibration proof coefficient is 2.24 and the focal length is 45.0 (mm), the amount of movement of the vibration proof lens group for correcting the 0.2 ° rotational blur is 0. .07 (mm). Further, in the telephoto end state, since the image stabilization coefficient is 3.76 and the focal length is 97.0 (mm), the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. 09 (mm).

(Table 5) Fifth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 102.3091 2.000 1.795040 28.69
2 41.8010 10.400 1.497820 82.57
3 -1007.6756 0.100
4 37.6062 5.150 1.834810 42.73
5 98.9884 Variable
* 6 99.2450 0.150 1.553890 38.09
7 94.6723 1.400 1.834810 42.73
8 12.0783 6.000
9 -32.7960 1.000 1.834810 42.73
10 46.9143 0.400
11 25.5606 3.800 1.846660 23.80
12 -54.2180 1.000 1.816000 46.59
13 54.1534 Variable
14 34.7874 0.800 1.850260 32.35
15 16.6502 2.600 1.618000 63.34
16 -37.1204 1.200
17 48.7843 2.600 1.497820 82.57
18 -18.5410 0.800 1.850 260 32.35
19 -41.7038 0.300
20 47.8525 1.600 1.696800 55.52
21 -59.5425 0.500
22 (Aperture S) ∞ Variable
23 -33.1327 0.800 1.816000 46.59
24 23.8736 0.700
25 -23.1424 0.800 1.816000 46.59
26 16.9872 2.000 1.808090 22.74
27 -33.9829 Variable
28 49.4602 3.500 1.589130 61.18
* 29 -19.7954 0.100
30 23.4122 4.400 1.497820 82.57
31 -23.4006 1.000 1.950000 29.37
32 -80.0819 0.300
33 85.4967 1.000 1.883000 40.66
34 14.9004 4.000 1.517420 52.20
35 -50.2458 1.450
36 -30.3940 1.000 2.000690 25.46
37 -82.9601 BF
Image plane ∞

[Aspherical data]
6th surface K = 15.1751
A4 = 4.64891E-06
A6 = -1.26998E-08
A8 = -3.35661E-10
A10 = 2.59761E-12
A12 = -8.51930E-15
A14 = 1.02560E-17

29th surface K = 1.2313
A4 = 1.39795E-05
A6 = 3.25121E-08

[Various data]
Scaling ratio 9.42
W M T
f 10.3 45.0 97.0
FNO 4.6 5.5 5.9
2ω 78.6 19.4 9.0
Y 8.0 8.0 8.0
TL 136.663 136.663 136.663
BF 21.775 17.923 14.148

W M T W M T
Infinity infinity infinity infinity short distance short distance short distance
d5 1.822 23.119 30.744 1.822 23.119 30.744
d13 30.318 9.021 1.396 30.318 9.021 1.396
d22 2.508 12.391 20.536 2.557 12.557 20.874
d27 17.391 11.359 6.988 17.341 11.193 6.650

[Lens group data]
Group start surface f
1 1 65.224
2 6 -10.504
3 14 16.830
4 23 -14.660
5 28 24.633

[Conditional expression values]
(1) f2 / f4 = 0.72
(2) (−f2) /f5=0.43
(3) f1 / f3 = 3.88
(4) f1 / (− f4) = 4.45

FIGS. 22A and 22B are diagrams showing various aberrations at the time of focusing on infinity in the wide-angle end state of the variable magnification optical system according to the fifth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 23A and 23B are graphs showing various aberrations at the time of focusing at infinity in the intermediate focal length state of the zoom optical system according to the fifth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when image stabilization is performed.
FIGS. 24A and 24B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom optical system according to the fifth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 25 (a), 25 (b), and 25 (c) are each in close focus 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. FIG.
From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance with excellent correction of various aberrations from the wide-angle end state to the telephoto end state, and also excellent during vibration isolation. It can be seen that it has imaging performance.

(Sixth embodiment)
FIG. 26 is a diagram showing a lens configuration of a variable magnification optical system according to the sixth example of the present application.
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, an aperture stop S, and a positive refraction. The lens unit includes a third lens group G3 having power, a fourth lens group G4 having negative refractive power, and a fifth lens group G5 having 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 includes, in order from the object side, 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 biconcave negative lens L24. It consists of.
The third lens group G3 includes, in order from the object side, a cemented lens of a negative meniscus lens L31 having a convex surface facing the object side and a biconvex positive lens L32, a biconvex positive lens L33, and a concave surface on the object side. And a cemented lens with the negative meniscus lens L34 directed.
The fourth lens group G4 includes, in order from the object side, a biconcave negative lens L41, and a cemented lens of a biconcave negative lens L42 and a biconvex positive lens L43.
The fifth lens group G5 includes, in order from the object side, a positive meniscus lens L51 having a concave surface facing the object side, a cemented lens of a negative meniscus lens L52 having a convex surface facing the object side, and a biconvex positive lens L53. The lens includes a biconvex positive lens L54 and a negative meniscus lens L55 having a concave surface facing the object side.

In the zoom optical system according to the present embodiment, the air gap between the first lens group G1 and the second lens group G2 and the second lens group G2 and the third lens group G3 during zooming from the wide-angle end state to the telephoto end state. , The fourth lens group G3 and the fourth lens group G4, and the fourth lens group G4 and the fifth lens group G5. The groups G2, G4, and G5 move in the optical axis direction. At this time, the positions of the first and third lens groups G1 and G3 and the aperture stop S are fixed.
In the zoom optical system according to the present example, the cemented lens of the negative meniscus lens L52 and the positive lens L53 in the fifth lens group G5 and the positive lens L54 are components in the direction orthogonal to the optical axis as a vibration-proof lens group. Thus, image blur can be corrected.
In the zoom optical system according to the present embodiment, focusing from a long-distance object to a short-distance object is performed by moving the entire fourth lens group G4 to the image side.

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 1.05 and a focal length of 10.3 (mm) in the wide-angle end state, in order to correct a rotational shake of 0.2 °. The amount of movement of the anti-vibration lens group is 0.03 (mm). Further, in the intermediate focal length state, the image stabilization coefficient is 0.99 and the focal length is 45.0 (mm), and therefore the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. .16 (mm). Further, in the telephoto end state, the image stabilization coefficient is 0.87 and the focal length is 97.0 (mm). Therefore, the amount of movement of the image stabilization lens group for correcting the 0.2 ° rotational blur is 0. 39 (mm).

(Table 6) Sixth Example
[Surface data]
Surface number r d nd νd
Object ∞
1 93.1619 1.800 1.850260 32.35
2 39.5859 8.000 1.497820 82.51
3 -284.0151 0.100
4 36.5540 5.000 1.729157 54.66
5 159.4459 Variable * 6 127.6881 1.000 1.816000 46.62
7 12.0348 5.060
8 -49.9978 0.800 1.816000 46.62
9 29.2932 0.200
10 18.9882 4.000 1.846660 23.78
11 -37.9737 0.471
12 -28.9543 1.000 1.834807 42.72
13 48.3879 Variable
14 (Aperture S) ∞ 0.000
15 37.6996 0.800 1.834000 37.16
16 17.4219 2.500 1.593190 67.90
17 -25.8437 0.100
18 20.8989 2.500 1.518601 69.97
19 -16.6811 0.800 1.846660 23.78
20 -31.8438 Variable
21 -36.4910 0.800 1.834807 42.72
22 29.3199 0.896
23 -27.0631 0.800 1.834807 42.72
24 18.2268 1.800 1.846660 23.78
25 -34.6409 Variable
26 -50.1069 2.000 1.497820 82.51
27 -19.1363 0.200
28 96.2015 1.000 1.834807 42.72
29 23.1567 4.000 1.497820 82.51
30 -46.1208 0.211
31 23.5512 3.000 1.497820 82.51
32 -152.9275 9.791
33 -37.8588 1.000 1.846660 23.78
34 -283.7365 BF
Image plane ∞

[Aspherical data]
6th surface K = 8.8617
A4 = 1.80790E-07
A6 = -6.06139E-09
A8 = 4.62589E-11
A10 = -2.20120E-13

[Various data]
Scaling ratio 9.42
W M T
f 10.3 45.0 97.0
FNO 4.7 5.3 6.1
2ω 78.3 19.4 9.1
Y 8.0 8.0 8.0
TL 128.784 128.784 128.784
BF 19.429 17.659 14.429

W M T W M T
Infinity infinity infinity infinity short distance short distance short distance
d5 0.800 20.665 28.181 0.800 20.665 28.181
d13 29.606 9.740 2.225 29.606 9.740 2.225
d20 0.800 9.620 15.486 0.855 9.821 15.897
d25 18.520 11.469 8.834 18.465 11.268 8.423

[Lens group data]
Group start surface f
1 1 57.030
2 6 -10.449
3 15 16.471
4 21 -18.248
5 26 28.038

[Conditional expression values]
(1) f2 / f4 = 0.57
(2) (−f2) /f5=0.37
(3) f1 / f3 = 3.46
(4) f1 / (− f4) = 3.13

FIGS. 27 (a) and 27 (b) are graphs showing various aberrations at the time of focusing on infinity in the wide-angle end state of the zoom optical system according to Example 6 and a rotational shake of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
FIGS. 28A and 28B are graphs showing various aberrations at the time of focusing at infinity in the intermediate focal length state of the zoom optical system according to the sixth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when image stabilization is performed.
FIGS. 29A and 29B are diagrams showing various aberrations at the time of focusing on infinity in the telephoto end state of the zoom optical system according to the sixth example, and a rotational blur of 0.2 °, respectively. FIG. 6 is a meridional lateral aberration diagram when vibration isolation is performed.
30 (a), 30 (b), and 30 (c), respectively, are in close focus at 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. FIG.
From the various aberration diagrams, the variable magnification optical system according to the present example has excellent imaging performance with excellent correction of various aberrations from the wide-angle end state to the telephoto end state, and also excellent during vibration isolation. It can be seen that it has imaging performance.

According to each of the above-described embodiments, it is possible to realize a variable power optical system that can satisfactorily suppress aberration fluctuations during zooming and aberration fluctuations during image blur correction.
In the variable power optical system according to each of the above embodiments, the distance (back focus) on the optical axis from the lens surface on the image side to the image surface of the lens component arranged closest to the image side is 10 in the smallest state. It is preferable that the thickness is about 0.0 to 30.0 mm. In the variable magnification optical system according to each of the above embodiments, the image height is preferably 5.0 to 12.5 mm, and more preferably 5.0 to 9.5 mm.

Here, each said Example has shown one specific example of this invention, and this invention is not limited to these.
In addition, the following content can be appropriately employed as long as the optical performance of the variable magnification optical system of the present application is not impaired.
A numerical example of the variable magnification optical system of the present application is shown as having a five-group configuration, but the present application is not limited to this, and constitutes a variable magnification optical system of other group configurations (for example, six groups, seven groups, etc.). You can also. Specifically, a configuration in which a lens or a lens group is added to the most object side or the most image plane 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 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 a long distance object to a short distance 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 fourth 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 optical system of the present application, either the entire lens group or a part thereof is moved as an anti-vibration lens group so as to include a component perpendicular to the optical axis, or rotated in an in-plane direction including the optical axis. It can also be configured to correct image blur caused by camera shake by moving (swinging). 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, the aperture stop is preferably disposed in the vicinity of the third lens group. However, a lens frame may be used as a substitute for the aperture stop without providing a member.
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 5 to 20 times.
In the variable magnification optical system of the present application, the first lens group preferably has two positive lens components. The second lens group preferably has one positive lens component and three negative lens components. The third lens group preferably has three positive lens components. The fourth lens group preferably has three positive lens components and one negative lens component.

Next, a camera provided with the variable magnification optical system of the present application will be described with reference to FIG.
FIG. 31 is a diagram illustrating a configuration of a camera including the variable magnification optical system of the present application.
This 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 as shown in FIG.
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.
With the above configuration, the present camera 1 equipped with the zoom optical system according to the first embodiment as the photographing lens 2 can satisfactorily suppress aberration fluctuations during zooming and realize good optical performance. 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.

Hereinafter, the outline of the manufacturing method of the variable magnification optical system of the present application will be described with reference to FIG.
FIG. 32 is a diagram showing a manufacturing method of the variable magnification optical system of the present application.
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 variable magnification optical system that includes a fourth lens group having a negative refractive power and a fifth lens group having a positive refractive power, and includes the following steps S1 to S3.
Step S1: Each lens group is prepared so that the second lens group, the fourth lens group, and the fifth lens group satisfy the following conditional expressions (1) and (2), and are arranged in order from the object side in the lens barrel. To do.
(1) 0.44 <f2 / f4 <1.00
(2) 0.20 <(− f2) / f5 <0.50
However,
f2: focal length of the second lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group

Step S2: By providing a known moving mechanism or the like, at the time of zooming 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 and the third lens group The air gap, the air gap between the third lens group and the fourth lens group, and the air gap between the fourth lens group and the fifth lens group are changed, and at this time, the position of the first lens group is fixed. To do.
Step S3: By providing a known moving mechanism, at least a part of any one of the lens groups moves so as to include a component in a direction orthogonal to the optical axis.
According to the method for manufacturing a variable magnification optical system of the present application, it is possible to manufacture a variable magnification optical system that satisfactorily suppresses aberration fluctuations during variable magnification.

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

Claims (11)

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 negative refractive power The lens group and the fifth lens group having a positive refractive power substantially consist of five lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the position of the first lens group is fixed,
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
A zoom optical system characterized by satisfying the following conditional expression:
0.57 ≦ f2 / f4 ≦ 0.73
0.20 <(− f2) / f5 <0.50
However,
f2: focal length of the second lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group 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 negative refractive power The lens group and the fifth lens group having a positive refractive power substantially consist of five lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the position of the first lens group is fixed,
The first lens group includes a cemented positive lens of a negative lens and a positive lens, and a single lens having a positive refractive power,
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
A zoom optical system characterized by satisfying the following conditional expression:
0.57 ≦ f2 / f4 <1.00
0.20 <(− f2) / f5 <0.50
However,
f2: focal length of the second lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group 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 negative refractive power The lens group and the fifth lens group having a positive refractive power substantially consist of five lens groups,
At the time of zooming from the wide-angle end state to the telephoto end state, the position of the first lens group is fixed,
The first lens group includes a cemented positive lens of a negative lens and a positive lens, and a single lens having a positive refractive power,
The lens group moves so that at least a part of any one lens group includes a component in a direction orthogonal to the optical axis,
A zoom optical system characterized by satisfying the following conditional expression:
0.51 ≦ f2 / f4 <1.00
0.20 <(− f2) / f5 <0.50
3.20 <f1 / f3 <5.00
However,
f1: Focal length of the first lens group f2: Focal length of the second lens group
f3: focal length of the third lens group f4: focal length of the fourth lens group f5: focal length of the fifth lens group The zoom lens system according to claim 1 or 2, wherein the following conditional expression is satisfied.
3.00 <f1 / f3 <5.00
However,
f1: Focal length of the first lens group f3: Focal length of the third lens group Variable magnification optical system as claimed in any one of claims 4, characterized by satisfying the following conditional expression.
2.00 <f1 / (− f4) <5.00
However,
f1: Focal length of the first lens group f4: Focal length of the fourth lens group Infinity when focusing on a close object from distant object, the variable magnification optical system according to any one of claims 1 to 5, wherein the fourth lens group and wherein the moving. The zoom optical system according to any one of claims 1 to 6 , wherein the position of the third lens group is fixed when zooming from the wide-angle end state to the telephoto end state. Variable magnification optical system as claimed in any one of claims 7, wherein at least a portion of the third lens group moves in a direction including a component perpendicular to the optical axis. Upon zooming from the wide-angle end state to the telephoto end state, the variable magnification optical system according to any one of claims 1 to 8, characterized in that the interval between the lens units vary. The variable magnification optical system according to any one of claims 1 to 9 , further comprising an aperture stop between the second lens group and the fourth lens group. An optical apparatus comprising the variable magnification optical system according to any one of claims 1 to 10 .

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