JPH0862541A - Variable power optical system having vibration damping function - Google Patents

Abstract

PURPOSE: To use a lens group of a small size and light weight as a moving lens group and to correct the large blur of an image with a smaller moving amt. by moving stationary lens groups in a direction approximately perpendicular to the optical axis. CONSTITUTION: Variable magnification from a wide angle end to a telephotographic end is executed by fixing the second group L2 and moving first, third, fourth and fifth groups L1 , L3 , L4 , L5 like arrows. The second group L2 is formed as an eccentric lens group and is moved in the direction perpendicular to the optical axis, by which the blur of the photographic image when the optical system vibrates is corrected. The lens group of the small size and light weight is used as the moving lens group and the large blur of the image is corrected by the small moving amt. at the time of correcting the blur of the image by moving part of the variable power optical system in a direction orthogonal with the optical axis. Further, the amt. of various kinds of the eccentric aberrations to be generated when the moving lens group is moved and is offcentered in approximately parallel is small and good optical performance is obtd.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable-magnification optical system having a function of correcting a blur of a photographed image due to vibration of an optical system, that is, a so-called anti-vibration function. The present invention relates to a variable-magnification optical system having a vibration-proof function for preventing deterioration of optical performance when the vibration-proof effect is exerted by moving in a direction orthogonal to each other.

[0002]

2. Description of the Related Art When an image is captured from a moving object such as a car or an airplane in progress, vibration is transmitted to the image capturing system and the captured image is blurred.

Conventionally, a vibration-proof optical system having a function of preventing blur of a photographed image is disclosed in, for example, Japanese Patent Laid-Open No. 50-80147, Japanese Patent Publication No. 56-21133, and Japanese Patent Laid-Open No. 61-2.
It is proposed in Japanese Patent No. 23819.

In Japanese Patent Application Laid-Open No. 50-80147, in a zoom lens having two afocal variable power systems, the angular magnification of the first variable power system is M ₁ and the angular power of the second variable power system is M.
_Then , the zooming is performed in each zooming system so as to have a relation of M ₁ = 1-1 / M ₂ when _2, and the _second zooming system is spatially fixed to correct the blurring of the image. We are trying to stabilize the image.

In Japanese Patent Publication No. 56-21133, some optical members are moved in a direction that cancels the vibrational displacement of an image due to vibration in accordance with an output signal from a detecting means for detecting the vibrational state of an optical device. To stabilize the image.

In Japanese Patent Laid-Open No. 61-223819, in a photographing system in which a refracting variable apex angle prism is arranged closest to the subject, the apex angle of the refracting variable apex prism is changed in response to the vibration of the photographing system. The image is deflected to stabilize the image.

In addition, Japanese Patent Publication No. 56-34847,
In Japanese Patent Publication No. 57-7414, an optical member that is spatially fixed against vibration is arranged in a part of the photographing system, and a photographed image is deflected by utilizing the prism action generated by the vibration of the optical member. A still image is obtained on the image plane.

Further, the vibration of the photographing system is detected by using the acceleration sensor, and a part of the lens group of the photographing system is vibrated in the direction orthogonal to the optical axis in accordance with the signal obtained at this time to obtain a still image. There are also ways to get it.

[0009]

Generally, a mechanism for obtaining a still image by vibrating a part of lens groups of a photographing system to eliminate a blur of a photographed image is required for a large correction amount of the blur of the image and for the blur correction. It is desired that the moving amount and the rotating amount of the lens group (movable lens group) vibrated in a small amount be small, and that the driving means be small and lightweight.

When a movable lens group is decentered, a large amount of eccentric coma, eccentric astigmatism, eccentric chromatic aberration, eccentric field curvature aberration, etc. occur when the image blur is corrected, and the image is blurred. Come on. For example, when a large amount of eccentric distortion aberration occurs, the amount of movement of the image on the optical axis and the amount of movement of the image in the peripheral portion differ. For this reason, when the movable lens group is decentered in order to correct the image blur for the image on the optical axis, a phenomenon similar to the image blur occurs in the peripheral portion, which causes a significant deterioration in optical characteristics. come.

As described above, in the variable power optical system having the image stabilizing function, when the movable lens group is moved in the direction orthogonal to the optical axis to be in the eccentric state, the amount of eccentric aberration generated is small and the deterioration of the optical performance is small. It is required that the so-called eccentricity sensitivity (the ratio Δx / ΔH of the image movement correction amount Δx to the unit movement amount ΔH) that can correct a large image blur with a small movement amount of the movable lens group is large. Has been done.

On the other hand, in the conventional anti-vibration optical system, in which an optical member which is spatially fixed against vibration is arranged, it is difficult to support the optical member, and a small optical system is used. Since it is difficult to realize the system, it is not suitable for the construction of a small and lightweight device. An anti-vibration optical system in which a variable apex angle prism is arranged closest to the object side of the photographing optical system has the advantage that aberrations other than decentration chromatic aberration do not occur at the time of anti-vibration correction, but the drive member becomes large and There is a problem that it is difficult to simply correct the eccentric chromatic aberration generated by the prism.

In a vibration-proof optical system that decenters a part of the lens groups of the photographing optical system, it is considered possible to downsize the device by properly selecting and arranging the decentering lens groups. There is a problem that it is difficult to realize a sufficiently large image stabilization with a sufficiently small drive amount while satisfactorily correcting various aberrations caused by the above, that is, eccentric coma aberration, eccentric astigmatism aberration, eccentric field curvature, and the like. there were.

According to the present invention, when a part of the lens group of the variable power optical system is moved in the direction orthogonal to the optical axis to correct the image blur, a small and lightweight lens group is used as the movable lens group and the amount of movement is small. It has a vibration control function that can correct large image blur with a certain amount, and further reduces the amount of the various decentering aberrations described above when the movable lens group is moved to decenter it in parallel. The objective is to provide a variable power optical system.

[0015]

A variable power optical system having an image stabilizing function according to the present invention comprises (1-1) variable powers on the object side and the image plane side of a fixed lens unit A upon zooming. It is characterized in that it has at least one lens group that moves in accordance with the above, and that the lens group A is moved in a direction substantially perpendicular to the optical axis to correct the blur of the captured image.
The lens group A moves such as parallel eccentricity or rotation about a point on the optical axis. (1-2) The first lens group having a positive refractive power moving along the optical axis in order from the object side during zooming, the second lens group having a fixed negative refractive power during zooming, and the optical axis upon zooming. An image-side lens unit having a positive refractive power that includes at least one moving lens unit, and the second unit is moved in a direction substantially perpendicular to the optical axis to correct the blur of a captured image. Is characterized by.

(1-3) From the object side, in order from the object side, the first group of positive refractive power, the second group of negative refractive power, the third group of positive refractive power, the fourth group of positive refractive power, and the negative group. Of the fifth lens group having a refracting power of 5, the second lens group is fixed, the distance between the lens groups is changed to perform zooming, and the second lens group is moved in a direction substantially perpendicular to the optical axis. The feature is that it is moved to correct the blurring of the captured image.

(1-4) From the object side, in order from the object side, the first group having a positive refractive power, the second group having a negative refractive power, the third group having a positive refractive power, the fourth group having a negative refractive power, and the positive group. It has six lens groups, a fifth lens group having a refractive power and a sixth lens group having a negative refractive power, and the second lens group is fixed, and the distance between the lens groups is changed to carry out zooming.
The feature is that the blur of the photographed image is corrected by moving the group in a direction substantially perpendicular to the optical axis.

[0018]

1 and 2 are a paraxial refractive power arrangement and a lens sectional view, respectively, of Numerical Embodiment 1 to be described later of a variable power optical system according to the present invention. 3 and 4 are paraxial refractive power arrangements and lens cross-sectional views of Numerical Example 2 to be described later of the variable power optical system according to the present invention. In the paraxial refractive power arrangements of FIGS. 1 and 3, (A) shows the wide-angle end and (B) shows the telephoto end. The arrows indicate the loci of movement of each lens unit due to zooming from the wide-angle end to the telephoto end. In the lens sectional views of FIGS. 2 and 4, (A) shows the wide-angle end, (B) shows the middle, and (C) shows the telephoto end.

In the numerical example 1 of FIGS. 1 and 2, L1
Is the first group of positive refractive power, L2 is the second group of negative refractive power, L
3 is a third group of positive refractive power, L4 is a fourth group of positive refractive power,
L5 is a fifth lens unit having a negative refractive power, SP is a stop, and IP is an image plane. Zooming from the wide-angle end to the telephoto end fixes the second group,
This is done by moving the first, third, fourth and fifth groups as indicated by the arrows to change the distance between the lens groups. Further, the second group is used as a decentering lens group and is moved in the direction perpendicular to the optical axis to correct the blurring of the captured image when the optical system vibrates.

In the numerical example 2 of FIGS. 3 and 4, L1
Is the first group of positive refractive power, L2 is the second group of negative refractive power, L
3 is a third group of positive refractive power, L4 is a fourth group of negative refractive power,
L5 is the fifth group of positive refractive power, L6 is the sixth group of negative refractive power
A group, SP is a stop, and IP is an image plane. Zooming from the wide-angle end to the telephoto end is performed by fixing the second and fourth groups, and moving the first, third, fifth, and sixth groups as indicated by the arrows to change the distance between the lens groups. There is. Further, the second group is used as a decentering lens group to move in the direction perpendicular to the optical axis to correct the blurring of the captured image when the optical system vibrates.

As described above, in the present invention, the variable power optical system as a whole is composed of at least three or more lens groups, and at least two or more lens groups are moved on the optical axis to perform variable power. In addition, a fixed lens group is provided between the plurality of lens groups that move during zooming during zooming. Then, during zooming, a fixed lens group is moved in a direction perpendicular to the optical axis to correct the blur of a captured image when the optical system vibrates.

In particular, in the present invention, the variable power optical system in order from the object side has a positive refractive power that moves along the optical axis during zooming, a second lens group that has a fixed negative refractive power during zooming,
Further, at the time of zooming, at least one or a plurality of lens groups that move on the optical axis at the time of zooming, and at least three or more lens groups of the image side lens group having a positive refracting power as a whole By moving in the direction perpendicular to the axis, the blur of the captured image when the optical system vibrates is corrected.

According to the present invention, with the above-described structure, the blurring of the photographed image is corrected, and the occurrence of decentering aberration when the second group is moved (decentered) in the direction perpendicular to the optical axis is reduced to improve the optical performance. Maintains good.

In Numerical Embodiment 1 of FIGS. 1 and 2, the distances between the wide-angle end and the telephoto end of the i-th group and the (i + 1) th group are DiW and DiT, respectively, upon zooming from the wide-angle end to the telephoto end. Then, the predetermined lens group is moved so as to satisfy the following conditions: D1W <D1T ... (1a) D2W> D2T ... (2a) D4W> D4T ... (3a).

In Numerical Embodiment 1, each lens unit is moved so as to satisfy the conditional expressions (1a) to (3a) at the time of zooming, thereby achieving a high zooming ratio while aiming at downsizing of the entire lens system. A variable-magnification optical system has been obtained. In the present embodiment, the second lens group may be moved on the optical axis when changing the magnification.
According to this, it becomes easy to increase the zoom ratio, and it is possible to satisfactorily correct the aberration variation due to zooming.

Further, in Numerical Embodiment 2 of FIGS. 3 and 4, upon zooming from the wide-angle end to the telephoto end, the i-th group and the (i + 1) th group
When the distances at the wide-angle end and the telephoto end of the group are DiW and DiT, respectively, D1W <D1T ... (1b) D2W> D2T ... (2b) D3W <D3T ... (3b) D5W > D5T ... (4b) The predetermined lens group is moved so as to satisfy the condition.

In the second numerical embodiment, the conditional expression (1
Each lens group is moved so as to satisfy the conditions (b) to (4b), and thereby the size of the entire lens system is reduced,
We have obtained a variable power optical system with a high variable power ratio. In the present embodiment, the second lens group may be moved on the optical axis when changing the magnification. According to this, it becomes easy to increase the zoom ratio, and it is possible to satisfactorily correct the aberration variation due to zooming.

In Numerical Embodiments 1 and 2 of the present invention, the following conditions are further satisfied: the size of the entire lens system is reduced and the occurrence of eccentric aberration when correcting the blur of a photographed image is reduced. It is preferable for maintaining good optical performance.

(2-1) The focal length of the lens group A is f
a, the focal length of the entire system at the wide-angle end and the telephoto end is f
When W and fT,

[0030]

(Equation 3) To satisfy the condition.

Conditional expression (5) defines the ratio of the focal length of the decentering lens unit (second lens unit) to the focal lengths at the wide-angle end and the telephoto end of the variable power optical system. If the focal length of the decentering lens unit becomes shorter than the lower limit of conditional expression (5), it becomes difficult to satisfactorily correct the variation of various aberrations during zooming, and it is impossible to increase the zoom ratio. Problems,
Since the decentering lens group cannot be composed of a small number of lenses, there is a problem that it is not suitable for downsizing.

On the contrary, if the focal length of the eccentric lens group becomes longer than the upper limit value of the conditional expression (5), it becomes advantageous for correction of various aberrations, but the eccentricity sensitivity of the eccentric lens group (shooting). It is not possible to increase the ratio of the displacement amount of the eccentric lens group to the displacement amount of the image). Therefore, it is necessary to increase the driving amount of the eccentric lens group for vibration compensation, and In this case, the amount of movement of each lens group becomes large, which causes a problem that it is not suitable for downsizing.

(2-2) The combined focal lengths at the wide-angle end and the telephoto end of the lens units arranged on the object side of the lens unit A are foW and foT, respectively, and the combined focal lengths are greater than those of the lens unit A and the lens unit A. When the combined focal lengths at the wide-angle end and the telephoto end with the lens unit arranged on the object side are frW and frT, respectively, 0.20 <| foW / frW | <1.50 (6) 0 .80 <| foT / frT | <6.0 (7).

Conditional expressions (6) and (7) are defined by the decentering lens group (second lens group) which is moved in the direction perpendicular to the optical axis at the time of vibration compensation.
Lens) which is located on the object side of the eccentric lens group including the combined focal length of the entire lens group located on the object side of the eccentric lens group and the eccentric lens group which is moved in the direction perpendicular to the optical axis during vibration compensation. It is an expression that defines the ratio of the combined focal lengths of the entire group, and specifies the ratio of the combined focal lengths at the wide-angle end and the telephoto end, respectively.

The conditional expressions (6) and (7) substantially define the ratio of the converted tilt angles of paraxial on-axis rays before and after the decentering lens group that is moved in the direction perpendicular to the optical axis during vibration compensation. By using the refractive power arrangement that satisfies these conditional expressions, eccentric aberration described later is satisfactorily corrected. Therefore, when the numerical range defined by the conditional expressions (6) and (7) is exceeded, it becomes impossible to satisfactorily correct the eccentric aberration with a simple lens configuration, and the eccentricity sensitivity should be sufficiently increased. There is a problem that it will not be possible.

In conditional expressions (6) and (7), conditional expression (6) has a wider numerical range than conditional expression (7) because the wide-angle end is at the telephoto end. This is because the amount of displacement of the image with respect to the vibration of a predetermined angle is smaller than that of, and the amount of eccentric aberration is also reduced.

Next, the optical characteristics of the variable power optical system having the image stabilizing function of the present invention will be described.

In general, if an attempt is made to correct image blur by decentering a part of lens groups of an optical system in parallel, decentering aberrations occur, and the image forming performance deteriorates. Therefore, next, at the 23rd Applied Physics Lecture, from the standpoint of aberration theory, the occurrence of eccentric aberration when the movable lens group is moved in the direction orthogonal to the optical axis in an arbitrary refractive power arrangement to correct image blur I will explain based on the method presented by Matsui at the meeting (1962).

The aberration amount ΔY1 of the entire system when a part of the lens unit P of the variable power optical system is decentered by parallel E is as shown in equation (a), the aberration amount ΔY before decentering and the decentering aberration amount caused by decentering. It becomes the sum of ΔY (E). The aberration amount ΔY is represented by spherical aberration (I), coma aberration (II), astigmatism (III), Petzval sum (P), and distortion aberration (Y). The eccentric aberration ΔY (E) is, as shown in the equation (C), the first-order eccentric coma aberration (II E), the first-order eccentric astigmatism (III E), the first-order eccentric image surface curvature (PE), First-order eccentric distortion aberration (VE
1) First-order decentering distortion-added aberration (VE2), and first-order origin movement (ΔE).

From equation (d), equations (i) to (ΔE) to (V)
Aberration up E2) in variable magnification optical system for parallel decentering lens group P the incident angle of the light beam to the lens group P alpha _P, .alpha.a
_Assuming P, the aberration coefficients I _P , II _P , II of the lens group P
I _P , P _P , and V _P, and similarly, when the lens unit arranged on the image plane side of the lens unit P is one q-th lens unit as a whole, the aberration coefficients are I _q , II _q , and III _q , It is represented using P _q and V _q .

[0041]

[Equation 4] _{(VE1) = α 'P V} q - α P (V P + V q) - αa P' III q + αa P (III P + III q) = h P φ P V q - α P V P - (ha _{P φ P III q -αa P III} P) ‥‥‥ (h) (VE2) = αa P P q - αa P (P P + P q) = ha P φ P P q - αa P P P ‥‥‥ (i) In order to reduce the occurrence of eccentric aberration from the above equation, the aberration coefficients I _P , II _P , III _P , P _P , and V _P of the lens group P are set to small values, or the equation (a) is used. It is necessary to set the various aberration coefficients in a well-balanced manner so as to cancel each other as shown in the formula (i).

Next, the optical function of the variable power optical system having the image stabilizing function of the present invention is photographed by eccentrically driving a part of the lens group of the photographing optical system shown in FIG. 17 in the direction orthogonal to the optical axis. A model assuming an anti-vibration optical system for correcting image displacement will be described.

First, in order to realize a sufficiently large displacement correction with a sufficiently small eccentric drive amount, the primary origin movement (Δ
E) needs to be sufficiently large. Based on this, the condition for correcting the primary eccentric field curvature (PE) will be considered. In FIG. 17, the photographing optical system is composed of three lens groups of an o-th group, a p-th group, and a q-th group in order from the object side.
Image blurring is corrected by moving the group in a direction orthogonal to the optical axis.

Here, let the refracting powers of the o-th group, the p-th group, and the q-th group be φ _o , φ _p , and φ _q , respectively, and let the incident angles of the paraxial on-axis ray and the off-axis ray on each lens group be α , Αa, the incident heights of paraxial on-axis rays and off-axis rays to h, ha, and the same s
Notated with uffix. It is also assumed that each lens group is composed of a small number of lenses, and that each aberration coefficient shows a tendency of undercorrection.

Under these assumptions, focusing on the Petzval sum of each lens group, the Petzval sum P of each lens group
_o , P _p , P _q are proportional to the refracting powers φ _o , φ _p , φ _q of each lens group, and are approximately P _o = Cφ _o P _p = Cφ _p P _q = Cφ _q (where C is a constant) To be satisfied. Therefore, the primary eccentric field curvature (PE) that occurs when the p-th group is decentered in parallel can be rearranged as follows by substituting the above equation.

(PE) = Cφ _p (h _p φ _q −α _p ) Therefore, in order to correct the eccentric field curvature (PE), φ _p =
It is necessary to set 0 or φ _q = α _p / h _p . However, if φ _p = 0, the primary origin movement (ΔE) becomes 0 and the displacement cannot be corrected. Therefore, a solution satisfying φ _q = α _p / h _p must be obtained. That is, since h _p > 0, at least α _p and φ _q need to have the same sign.

(A) When α _p > 0 φ _q > 0 for correction of eccentric field curvature, and inevitably φ _o >
It becomes 0. Further, if φ _p > 0 at this time, 0 <α _p <α
′ _P <1, the primary origin movement (ΔE) is as follows.

(ΔE) = − 2 (α _p ′ −α _p )> − 2 That is, the eccentricity sensitivity (the ratio of the displacement amount of the shake of the photographed image to the unit displacement amount of the eccentric lens group) becomes smaller than 1. Further, as described above, the eccentricity sensitivity becomes 0 when φ _p = 0. Therefore, in such a case, φ _p <0 must be set.

(B) When α _p <0, φ _q <0, inevitably φ _o <0, and therefore inevitably φ _p > 0 due to the correction of the eccentric field curvature (PE).

As described above, the refractive power arrangement of the optical system which can correct the primary decentering field curvature (PE) while sufficiently increasing the primary origin movement (ΔE) is as follows. Is suitable.

[0051]

[Table 1] FIG. 18 (A) and FIG. 18 (B) respectively show a lens configuration having such a refractive power arrangement.

In the present invention, a variable power optical system is constructed by utilizing such a refractive power arrangement. Generally, in a variable power optical system, by appropriately setting the refracting power of each lens group, a sufficiently large variable power effect is realized with a compact lens structure, and at the same time various aberrations are corrected well. At this time, it is preferable that each lens group that contributes to zooming of the zooming optical system has a relatively strong refractive power in order to make the entire lens system a compact lens structure. Further, it is preferable to reduce the amount of residual aberration in each lens group in order to satisfactorily correct variations in various aberrations during zooming.

As a method of constructing a variable power optical system having a vibration-proof function for correcting the displacement of a photographed image by decentering a part of lens groups of the variable power optical system in a direction orthogonal to the optical axis, decentering sensitive There is a method of directly applying a lens group that contributes to zooming as a lens group for parallel decentering, from the viewpoint that the degree can be sufficiently increased and the correction of decentration aberrations is relatively easy.

On the other hand, in order to make the apparatus itself compact,
It is desirable to select a lens group having a relatively small lens outer diameter as the lens group to be decentered in parallel. In order to prevent the mechanism from becoming complicated, as a decentering lens group for decentering parallelism,
It is mechanically desirable to select a fixed lens group for zooming.

From the above viewpoints, the present invention has a basic lens configuration having the refractive power arrangements shown in FIGS. 18A and 18B, and moves the o-th group and the q-th group on the optical axis during zooming. Then, a variable power optical system in which the p-th group is fixed is adopted.

In the present invention, the lens group that is movable during zooming is not limited to such a basic lens structure,
The o-th group and the q-th group described above may each be divided into one or a plurality of lens groups, which makes it possible to realize a variable power optical system in which various aberrations are satisfactorily corrected. In each of the above embodiments, the second group is eccentric in parallel and
Alternatively, instead of the parallel eccentricity, the shake of the photographed image may be corrected by rotating about a point on the optical axis.

Next, numerical examples of the present invention will be shown. In the numerical examples, Ri is the radius of curvature of the i-th lens surface in order from the object side, Di is the i-th lens thickness and air gap from the object side, and Ni and νi are respectively from the object side of the i-th lens. The refractive index of glass and the Abbe number. (Numerical Example 1) R 1 = 101.63 D 1 = 2.8 N 1 = 1.80518 ν 1 = 25.4 R 2 = 65.89 D 2 = 6.8 N 2 = 1.51633 ν 2 = 64.2 R 3 = 1548.66 D 3 = 0.2 R 4 = 207.11 D 4 = 4.2 N 3 = 1.48749 ν 3 = 70.2 R 5 = -337.94 D 5 = Variable R 6 = -125.77 D 6 = 1.5 N 4 = 1.77 250 ν 4 = 49.6 R 7 = 151.03 D 7 = 2.8 R 8 =- 67.50 D 8 = 1.5 N 5 = 1.61800 ν 5 = 63.4 R 9 = 44.49 D 9 = 3.4 N 6 = 1.84666 ν 6 = 23.8 R10 = 125.21 D10 = variable R11 = (aperture) D11 = 1.5 R12 = 157.70 D12 = 3.7 N 7 = 1.48749 ν 7 = 70.2 R13 = -86.24 D13 = 0.2 R14 = 46.44 D14 = 5.7 N 8 = 1.60311 ν 8 = 60.7 R15 = -78.17 D15 = 1.5 N 9 = 1.83400 ν 9 = 37.2 R16 = 308.70 D16 = variable R17 = 159.74 D17 = 4.6 N10 = 1.60311 ν10 = 60.7 R18 = -35.11 D18 = 1.5 N11 = 1.80518 ν11 = 25.4 R19 = -118.95 D19 = 0.2 R20 = 38.80 D20 = 4.0 N12 = 1.51633 ν12 = 64.2 R21 = 2284.84 D21 = variable R22 = -68.32 D22 = 1.5 N13 = 1.77250 ν13 = 49.6 R23 = 34.06 D23 = 3.6 R24 = -162.72 D24 = 1.5 N14 = 1.69680 ν14 = 55.5 R25 = 98.00 D25 = 0.2 R26 = 49.20 D26 = 4.3 N15 = 1.80518 ν15 = 25.4 R27 = -185.92

[0058]

[Table 2]

[0059]

(Equation 5) (Numerical Example 2) R 1 = 104.82 D 1 = 2.8 N 1 = 1.80518 ν 1 = 25.4 R 2 = 65.22 D 2 = 6.6 N 2 = 1.51633 ν 2 = 64.2 R 3 = 1064.41 D 3 = 0.2 R 4 = 157.35 D 4 = 4.6 N 3 = 1.51633 ν 3 = 64.2 R 5 = -339.86 D 5 = Variable R 6 = -172.44 D 6 = 1.5 N 4 = 1.77250 ν 4 = 49.6 R 7 = 63.56 D 7 = 4.9 R 8 =- 34.89 D 8 = 1.5 N 5 = 1.51633 ν 5 = 64.2 R 9 = 78.96 D 9 = 3.5 N 6 = 1.84666 ν 6 = 23.8 R10 = -270.70 D10 = variable R11 = 63.23 D11 = 4.4 N 7 = 1.60311 ν 7 = 60.7 R12 = -77.78 D12 = 0.2 R13 = 57.33 D13 = 4.8 N 8 = 1.48749 ν 8 = 70.2 R14 = -59.18 D14 = 1.5 N 9 = 1.83400 ν 9 = 37.2 R15 = 210.50 D15 = 3.0 R16 = (Aperture) D16 = Variable R17 = -58.16 D17 = 2.5 N10 = 1.60311 ν10 = 60.7 R18 = -77.22 D18 = Variable R19 = 177.20 D19 = 4.2 N11 = 1.60311 ν11 = 60.7 R20 = -42.39 D20 = 1.5 N12 = 1.80518 ν12 = 25.4 R21 = -88.25 D21 = 0.2 R22 = 56.85 D22 = 2.8 N13 = 1.51633 ν13 = 64.2 R23 = 218.49 D23 = variable R24 = -44.17 D24 = 1.5 N14 = 1.77250 ν14 = 49.6 R25 = 51.97 D25 = 3.3 N15 = 1.80518 ν15 = 25.4 R26 = 2229.01

[0060]

[Table 3]

[0061]

(Equation 6)

[0062]

According to the present invention, when each element is set as described above, when a part of the lens group of the variable power optical system is moved in the direction orthogonal to the optical axis to correct the image blur. ,
Using a small and lightweight lens group as the movable lens group, it is possible to correct large image blur with a small amount of movement,
Further, it is possible to achieve a variable power optical system having a vibration-proof function, in which the amount of various decentering aberrations described above is small when the movable lens group is moved to be substantially decentered in parallel, and good optical performance is obtained.

According to the present invention, in particular, various eccentric aberrations are satisfactorily corrected, while a sufficiently large displacement correction is realized with a sufficiently small eccentric drive amount, and a lens group other than the eccentric drive lens group is used as an optical axis. It is possible to achieve a variable-magnification optical system having a vibration-proof function by which a good image can be obtained with a small scale, as a configuration in which the image is moved by changing the magnification.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a paraxial refractive power arrangement according to Numerical Example 1 of the present invention.

FIG. 2 is a lens cross-sectional view of Numerical Example 1 of the present invention.

FIG. 3 is an explanatory diagram of a paraxial refractive power arrangement according to Numerical Example 2 of the present invention.

FIG. 4 is a lens cross-sectional view of Numerical Example 2 of the present invention.

FIG. 5 is an aberration diagram of a reference state at the wide-angle end according to Numerical Example 1 of the present invention.

FIG. 6 is an aberration diagram when correcting one-degree vibration at the wide-angle end according to Numerical Example 1 of the present invention.

FIG. 7 is an aberration diagram of a reference state in the middle of Numerical Example 1 of the present invention.

FIG. 8 is an aberration diagram when a one-degree vibration in the middle of Numerical Example 1 of the present invention is corrected.

FIG. 9 is an aberration diagram of a reference state at the telephoto end according to Numerical Example 1 of the present invention.

FIG. 10 is an aberration diagram when correcting 1-degree vibration at the telephoto end according to Numerical Example 1 of the present invention.

FIG. 11 is an aberration diagram of a reference state at the wide-angle end according to Numerical Example 2 of the present invention.

FIG. 12 is an aberration diagram when correcting one-degree vibration at the wide-angle end according to Numerical Example 2 of the present invention.

FIG. 13 is an aberration diagram of a reference state in the middle of Numerical Example 2 of the present invention.

FIG. 14 is an aberration diagram when a one-degree vibration in the middle of Numerical Example 2 of the present invention is corrected.

FIG. 15 is an aberration diagram of a reference state at the telephoto end according to Numerical Example 2 of the present invention.

FIG. 16 is an aberration diagram when correcting 1-degree vibration at the telephoto end according to Numerical Example 2 of the present invention.

FIG. 17 is a schematic diagram of a lens configuration for explaining decentering aberration correction in the present invention.

FIG. 18 is a schematic diagram of a lens configuration for explaining decentering aberration correction in the present invention.

[Explanation of symbols]

 L1 1st group L2 2nd group L3 3rd group L4 4th group L5 5th group L6 6th group SP Aperture IP Image plane h Image height

Claims (10)

[Claims] 1. At least one lens group, which moves with zooming, is disposed on the object side and the image plane side of a fixed lens group A during zooming, and the lens group A is arranged in a direction substantially perpendicular to the optical axis. A variable-magnification optical system having a vibration-proof function, which is characterized by moving the camera to a position to correct the blur of a captured image. 2. A first lens unit having a positive refractive power which moves on the optical axis in order from the object side during zooming, a second lens unit having a fixed negative refractive power during zooming, and an optical axis upon zooming. An image-side lens unit having a positive refractive power that includes at least one moving lens unit, and the second unit is moved in a direction substantially perpendicular to the optical axis to correct the blur of a captured image. A variable-magnification optical system with an anti-vibration function. 3. When the focal length of the lens unit A is fa and the focal lengths of the entire system at the wide-angle end and the telephoto end are fW and fT, respectively, The variable power optical system having the image stabilizing function according to claim 1 or 2, which satisfies the following condition. 4. The composite focal lengths at the wide-angle end and the telephoto end of the lens units arranged closer to the object side than the lens unit A are foW and foT, respectively, and the combined focal lengths are closer to the object side than the lens unit A and the lens unit A. When the combined focal lengths at the wide-angle end and the telephoto end with the arranged lens group are frW and frT, respectively, 0.20 <| foW / frW | <1.50 0.80 <| foT / frT | <6 A variable power optical system having a vibration isolation function according to claim 1 or 2, wherein the condition of 0.0 is satisfied. 5. A first group having a positive refractive power, a second group having a negative refractive power, a third group having a positive refractive power, a fourth group having a positive refractive power, and a negative refractive power in order from the object side. Of the fifth lens group, the second lens group is fixed, the distance between the lens groups is changed to perform zooming, and the second lens group is moved in a direction substantially perpendicular to the optical axis. A variable-magnification optical system having a vibration-proof function, which is characterized by correcting the blur of a photographed image. 6. When zooming from the wide-angle end to the telephoto end, when the distances between the wide-angle end and the telephoto end of the i-th group and the (i + 1) th group are DiW and DiT, respectively, D1W <D1T D2W> D2T D4W 4. The variable power optical system having a vibration isolation function according to claim 3, wherein a predetermined lens group is moved so as to satisfy the condition of> D4T. 7. A first group having a positive refractive power, a second group having a negative refractive power, a third group having a positive refractive power, a fourth group having a negative refractive power, and a fourth group having a positive refractive power in order from the object side. 5th group, and 6th with negative refractive power
There are six lens groups, the second group is fixed, the distance between the lens groups is changed to perform zooming, and the second group is moved in a direction substantially perpendicular to the optical axis to obtain a photographed image. A variable-magnification optical system with a vibration-proof function characterized by correcting blur. 8. When zooming from the wide-angle end to the telephoto end, when the distances between the wide-angle end and the telephoto end of the i-th group and the (i + 1) th group are DiW and DiT, respectively, D1W <D1T D2W> D2T D3W 6. The variable power optical system having an image stabilizing function according to claim 5, wherein a predetermined lens group is moved so as to satisfy a condition of <D3T D5W> D5T. 9. When the focal length of the second lens unit is fa and the focal lengths of the entire system at the wide-angle end and the telephoto end are fW and fT, respectively, The variable power optical system having the image stabilizing function according to claim 5 or 7, characterized in that the following condition is satisfied. 10. The combined focal lengths at the wide-angle end and the telephoto end of the lens units arranged closer to the object side than the second unit are foW and foT, respectively, and are closer to the object side than the second unit and the second unit. When the combined focal lengths at the wide-angle end and the telephoto end with the arranged lens group are frW and frT, respectively, 0.20 <| foW / frW | <1.50 0.80 <| foT / frT | <6 9. A variable power optical system having an image stabilizing function according to claim 5 or 7, characterized in that the condition of 0.0 is satisfied.