JP2002196383A - Shake correcting device and optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that the driving performance of a shift member is deteriorated because sliding frictional force is generated when the shift member is driven to be shifted in a shake correcting device. SOLUTION: In this shake correcting device having the shift member 1 driven to be shifted in a direction orthogonal to an optical axis in order to correct image blur, the shift member is provided with a movable member 10 integrally moving with the shift member in the direction orthogonal to the optical axis and held to move in an optical axis direction, balls 11 and 12 arranged between the respective surfaces orthogonal to the optical axis of the movable member and the shift member and that of a fixed member (yokes 4 and 5) so that they can roll respectively, and an energizing member 9 arranged between the movable member and the shift member and generating the energizing force for interposing the respective balls by the surfaces orthogonal to the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called shift type image stabilizing device mounted on optical equipment such as a lens barrel, a photographing device, and an observation device.

[0002]

2. Description of the Related Art In a current camera, all operations important for photographing, such as exposure determination and focus adjustment, have been automated, and even a person unskilled in camera operation has a very low possibility of failing in photographing. I have.

Recently, a system for correcting an image blur caused by a camera shake applied to a camera has been studied, and a factor which causes a photographer to fail in photographing has been reduced.

Here, a system for correcting image blur caused by camera shake will be briefly described. The camera shake at the time of photographing is generally a vibration of about 1 Hz to 12 Hz as a frequency. However, even if such camera shake occurs at the time of release of the shutter, it is necessary to take a picture without image shake. As a general idea, the camera shake due to the above-mentioned camera shake may be detected, and the correction lens may be displaced in the direction orthogonal to the optical axis according to the detected value.

Therefore, in order to be able to take a picture in which image shake does not occur even if camera shake occurs, first, the camera vibration must be accurately detected, and second, the optical axis change due to the camera vibration. Needs to be corrected by displacing the correction lens.

In principle, this vibration (camera shake) is detected by a shake detection sensor for detecting acceleration, speed, and the like, and a displacement is obtained by electrically or mechanically integrating an output signal of the shake detection sensor. This can be achieved by mounting the output means on a camera.

[0007] Based on the detected information, a shift member (consisting of a correction lens, a holding frame for holding the correction lens, and the like) in the shake correction device mounted to change the optical axis of the photographing is controlled. By displacing the correction lens, the image blur can be corrected.

Here, an outline of a shake correcting apparatus using a shake detecting sensor will be briefly described with reference to FIG. FIG. 3 shows a vertical (pitch direction) shake 101 p of the camera in the direction of arrow 101 in the figure and a horizontal (yaw direction) of the camera.
An example of an apparatus that corrects or suppresses image shake caused by the shake 101y is shown.

In FIG. 3, reference numeral 102 denotes a lens barrel. 10
Reference numerals 3p and 103y denote shake detection sensors for detecting the vertical shake and the horizontal shake of the camera, respectively.
04p and 104y.

Reference numeral 105 denotes a shift member, and 107p, 1
07y is a coil for applying a thrust to the shift member 105, and 106p and 106y are detection elements for detecting the position of the shift member 105. The shift member 105 is arranged in the position control loop, and the shake detection sensors 103p, 103
Drive is performed with the output of 03y as the target value, and image stability on the image plane 108 is ensured.

The present applicant has proposed various types of shake correction devices used in optical devices such as cameras equipped with the above-described shake correction devices. Among them, a device for suppressing the inclination of the shift member with respect to the optical axis is disclosed. Various configurations have been proposed for preventing the deterioration of optical performance. For example, JP-A-10-2678
Japanese Patent Application Laid-Open No. 3 (1999) -1995 proposes a configuration in which a pressing member and a spring prevent the shift member from falling down.

Here, FIG.
As with the shake correction device proposed in Japanese Patent No. 6783, the configuration of a conventional shake correction device that suppresses the tilting of the shift member is shown. In this figure, reference numeral 201 denotes a support frame holding the correction lens L, and shift driving coils 203 are integrally provided at two positions in a pitch direction and a yaw direction.

A first hole 201a into which the first pressing member 209 is inserted and a second hole 201a are formed in the flange portion of the support frame 201.
The second hole 201c into which the pressing member 210 and the spring 211 are inserted is formed at three places in the circumferential direction.

On the outer periphery of the lens holding portion of the support frame 201, three or four fitting projections 201d are provided in the circumferential direction, and the fitting projections 201d are formed at a predetermined angle with the inner circumferential fitting portion 208a of the lock ring 208 described later. Fit in phase.

A base plate 202 is attached to a lens barrel (not shown) or the like, and a first yoke 204 and a second yoke 205 are fixed to the base plate 202 by screws. A fitting projection 202a provided on the inner peripheral portion of the main plate 202 has a fitting portion 208b of the lock ring 208 attached thereto.
Are fitted.

Reference numeral 203 denotes a coil provided at one position in the pitch direction and one position in the yaw direction, and these coils 203 are electrically connected to a drive circuit (not shown).

Reference numerals 204 and 205 denote yokes, which are fixed to the base plate 202 by screws according to the driving directions in the pitch direction and the yaw direction, respectively. Reference numerals 206 and 207 denote magnets, which are magnetically coupled to the yokes 204 and 205.
By energizing the coil 203 of the driving means constituted by these opposed magnets and coils,
The shift member including the correction lens L and the support frame 201 is driven in the pitch direction and the yaw direction, and the image blur is corrected.

Reference numeral 208 denotes a lock ring, which is rotatably driven by a drive circuit (not shown), and which is driven to a predetermined angular phase when the inner peripheral fitting portion 208 of the lock ring 208 is rotated.
a engages with the fitting protrusion 201d, and locks the support frame 201 at the center position. Further, when the inner peripheral fitting portion 208a of the lock ring 208 is driven to a position shifted from the angular phase with the fitting protrusion 201d, the support frame 201 can be shifted.

The first pressing member 209 is inserted so that its bottom surface abuts against the bottom surface 201b of the hole 201a provided in the support frame 201, and its spherical tip portion is attached to the yoke 2
09. This allows
The distance between the support frame 201 and the yoke 205 in the optical axis direction is kept constant.

The second pressing member 210 is configured such that the spherical tip thereof abuts on the yoke 204 by the urging force of the spring 211 inserted between the second pressing member 210 and the first pressing member 209. By setting the biasing force of the spring 211 to an appropriate value, the shift member can be prevented from falling down.

Japanese Patent Application Laid-Open No. 11-64916 proposes a structure in which a ball is rolled by using a retainer so that the shift member is prevented from falling down and the shift driving load is reduced. ing.

[0022]

However, in the shake correction device proposed in Japanese Patent Application Laid-Open No. Hei 10-26783 and the shake correction device shown in FIG. There is a problem that a sliding friction force is generated between the yokes, and the driving performance of the shift member deteriorates due to the influence of the sliding friction force.

If the urging force of the spring (the pressing force of the pressing member against the yoke) is reduced so as not to deteriorate the shift driving performance, the shift member is likely to fall down. It is difficult to set properly.

Further, in the shake correction device proposed in Japanese Patent Application Laid-Open No. 11-64916, the frictional force generated during the shift drive between the ball and the fixed member becomes rolling frictional force, but the sliding frictional force between the ball and the retainer. There is a problem that a force is generated, and the sliding friction force deteriorates the shift driving performance.

Accordingly, the present invention provides a vibration correcting device which can hold and guide the shift member without play and reduce the frictional force generated at the time of shift driving, thereby achieving extremely good shift driving performance. It is an object.

[0026]

In order to achieve the above object, the present invention provides a shake correcting apparatus having a shift member which is driven to shift in a direction orthogonal to an optical axis in order to correct image shake. A movable member that moves integrally with the shift member in the optical axis orthogonal direction and is held movably in the optical axis direction; and an optical axis orthogonal surface of the movable member and the shift member and an optical axis orthogonal surface of the fixed member. And a biasing member which is provided between the movable member and the shift member, and which generates a biasing force for clamping each ball by the respective optical axis orthogonal planes. Are provided.

Thus, when the shift member is shifted, the ball rolls between the movable member, the shift member, and the fixed member. Therefore, the frictional force generated between the movable member, the shift member, and the fixed member is: The rolling friction force is smaller than the sliding friction force. For this reason, even if the urging force of the urging member is sufficiently increased, good shift driving performance can be ensured so as to reliably prevent the shift member from falling down.

Here, the ball is not directly urged by the urging member (the urging member and the ball are brought into direct contact with each other), but a surface on which the ball rolls is provided between the urging member and the ball. The interposition of the movable member prevents sliding friction between the ball and the biasing member.

Further, since the fixing member is a yoke which is fixed to the apparatus main body and constitutes a driving means of the shift member, it is not necessary to provide a dedicated fixing member for rolling the ball, and the arrangement of the ball is free. The degree also increases.

More specifically, for example, a yoke and a magnet constituting the shift driving means are arranged in pairs on both sides of the coil in the optical axis direction, and the yoke and the magnet are arranged in a portion of the shift member arranged between the yokes on both sides. Balls are arranged between the one yoke and the movable member and between the other yoke and the shift member so as to hold the movable member, and the one of the first and second yokes is moved by the urging force generated by compressive deformation of the urging member. The configuration in which the ball is sandwiched between the yoke and the movable member and between the other yoke and the shift member allows the shift member to be moved within the width originally required for the two yokes and in the optical axis direction. It is possible to guide in the orthogonal direction, the thickness in the optical axis direction is thin, and it is possible to more stably prevent the tilting of the shift member.

Also, for example, the movable member is disposed on the side of the shift member opposite to the yoke in the direction opposite to the optical axis, and can be rolled between the yoke and the movable member and between the yoke and the shift member. By disposing the ball and holding the ball between the yoke and the movable member and between the yoke and the shift member by the urging force generated by the tensile deformation of the urging member, the yoke can be moved from the front and rear in the optical axis direction. It is possible to guide the shift member in the direction orthogonal to the optical axis by sandwiching it, so that the shift member can be more stably prevented from falling.

Further, a rolling restricting portion for restricting the rolling range of the ball is formed on the movable member and the shift member so that the ball does not deviate from the proper rolling range during the shift driving or the like. It is not necessary to perform a process for forming the rolling restriction portion, and the above-described object can be achieved while suppressing an increase in cost.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 shows a sectional configuration of a shake correction apparatus according to a first embodiment of the present invention. This shake correction device is mounted on a lens barrel, a still image and moving image photographing device, an observation device such as binoculars and a telescope, and other optical devices.

In FIG. 1, reference numeral 1 denotes a support frame (shift member) for holding the correction lens L. On this support frame 1, a shift driving coil 3 is provided at one location in the pitch direction and one location in the yaw direction ( (Not shown).

FIG. 1 shows a cross section in the pitch direction of the shake correcting apparatus, and a yaw direction driving unit including a coil 3 and having the same configuration as a pitch direction driving unit described later is omitted.

A flange formed on the outer periphery of the correction lens holding portion of the support frame 1 has a first concave portion 1a for accommodating the first ball 11, a movable member 10 and a compression coil spring (biasing) which will be described later. The second concave portion 1c into which the (member) 9 is inserted is provided at three places in the circumferential direction so as to open toward opposite sides in the optical axis direction. The flange portion is disposed between yokes (fixing members) 4 and 5 described later, and the concave portions 1a and 1c face the yokes 4 and 5, respectively.

On the outer periphery of the correction lens holding portion, fitting projections 1d are provided at three or four circumferential positions.
It is designed to fit with an inner peripheral fitting portion 8a of the lock ring 8 described later at a predetermined angle phase.

Reference numeral 2 denotes a base plate (apparatus main body) attached to a lens barrel (not shown) or the like. A first yoke 4 is fixed to the front end of the base plate 2 with screws, and a second yoke 5 is fixed to the front surface of the rear wall of the base plate 2 with screws.
The coils 3 provided on the support frame 1
Placed between. The coil 3 is electrically connected to a drive circuit (not shown). Each of the yokes 4 and 5 is formed in a substantially flat ring shape extending in the pitch driving direction.

A fitting protrusion 2a is formed on the inner peripheral portion of the base plate 2, and a fitting portion 8b of the lock ring 8 is provided on the fitting protrusion 2a so that the lock ring 8 rotates about the optical axis. Are fitted.

Reference numerals 6 and 7 denote magnets, and the yokes 4 and 5
Is magnetically coupled. Pitch direction driving means for driving the support frame 1 in the pitch direction is constituted by the yokes 4, 5, the magnets 6, 7 and the coil 3 which are arranged opposite to each other.
Is driven in the pitch direction. Also,
Similarly, in the yaw direction, the support frame 1 is driven in the yaw direction by energizing a coil (not shown).

A control circuit (not shown) controls a coil (not shown) based on an output from a shake detection sensor (not shown) for detecting a shake in the pitch direction and a shake in the yaw direction provided in the lens barrel, the photographing device, or the observation device. The image blur is corrected by shifting the support frame 1 in the pitch direction and the yaw direction so as to suppress the displacement of the image plane in the pitch direction and the yaw direction due to camera shake and the like.

The lock ring 8 is driven to rotate around the optical axis by a drive circuit (not shown), and when driven at a predetermined angular phase, a fitting projection 1d formed on the support frame 1 and the inner periphery of the lock ring 8 are formed. The fitting portion 8a is fitted, and the support frame 1 is locked at the center position (the position where the optical axis of the correction lens L coincides with the optical axis of another lens group in a lens barrel or the like).

Further, the lock ring 8 is rotationally driven to a position where the angular phase between the inner peripheral fitting portion 8a of the lock ring 8 and the fitting protrusion 1d is shifted, so that the shift driving of the support frame 1 is permitted. .

The movable member 10 is inserted and held in a second concave portion 1c provided in the support frame 1 so as to be movable in the optical axis direction. A concave portion 10 is provided on the yoke 5 side of the movable member 10.
a is formed, and the second ball 12 is accommodated in the concave portion 10a.

The compression coil spring 9 is disposed between the movable member 10 and the bottom surface (front end surface in the optical axis direction) of the concave portion 1c formed in the flange portion of the support frame 1 in a compressed state. The second ball 12 is urged through the member 10 toward the second yoke 5 which is disposed to face the second ball 12.

As a result, the second ball 12 comes into pressure contact with the optical axis orthogonal surface 10b, which is the bottom surface of the concave portion 10a of the movable member 10, and the optical axis orthogonal surface, which is the front surface of the second yoke 5, and further compresses the coil. Due to the urging reaction of the movable member 10 by the spring 9, the first ball 11 is moved to the first recess 1 of the support frame 11.
The optical axis orthogonal surface 1b, which is the bottom surface of a, and the optical axis orthogonal surface, which is the rear surface of the first yoke 4, are pressed against each other. That is, the first ball 11 is pressed and held between the support frame 11 and the first yoke 4, and the second ball 12 is held between the movable member 10 and the second yoke 5.
And between them.

In the image stabilizing apparatus configured as described above,
Since the frictional force generated between the support frame 1 and the movable member 10 and the yokes 4 and 5 during the shift driving of the support frame 1 is sufficiently small as the rolling frictional force as compared with the sliding frictional force, the compression coil spring 9 is attached. Even if the force (elastic force) is set to a sufficiently strong force that can reliably suppress the fall of the support frame 1 (correction lens L), extremely good shift drive performance can be secured. Therefore, the minute drive control of the support frame 1 by controlling the energization of the coil 3 from the control circuit (fine shake correction control)
For example, it is possible to cope with shooting of an image without a shake by a recent image pickup device in which the size is reduced and the number of pixels is increased.

Here, the compression coil spring 9 directly
Energizes the second ball 12 (the compression coil spring 9 and the second
Directly between the compression coil spring 9 and the second ball 12.
By interposing the movable member 10 having the surface 10b on which the roll 2 rotates, it is possible to prevent the occurrence of sliding friction between the second ball 12 and the compression coil spring 9.

Furthermore, the surfaces on which the balls 11, 12 roll are the surfaces of the yokes 4, 5, so that the balls 11, 12
It is not necessary to provide a dedicated fixing member for rolling the ball, the number of components can be reduced, the weight of the device can be reduced, and the degree of freedom of arrangement of the balls 11 and 12 can be increased.

Also, during the shift driving of the support frame 1, the concave portions 1a, 10a are provided in the support frame 1 and the movable member 10 so that the balls 11, 12 do not deviate from an appropriate rolling range.
a are formed, and balls 11, 1 are formed in the recesses 1a, 10a.
Since the rolling range of the balls 11 and 12 is restricted by the peripheral surfaces (rolling restricting portions) other than the bottom surfaces of the concave portions 1 a and 10 a after the housing 2 is accommodated, the rolling restricting portions are formed in the yokes 4 and 5. Therefore, it is not necessary to perform a process for performing the process, and it is possible to suppress an increase in cost.

Further, in this embodiment, the support frame 1 can be guided in the pitch direction and the yaw direction within the originally required width between the yokes 4 and 5, and the support frame 1 is moved in the pitch direction before and after the optical axis direction. Since the guide can be guided in the yaw direction, the anti-shake device having a small thickness in the optical axis direction can be realized, and the fall of the support frame 1 can be more stably prevented.

In the present embodiment, the case where the compression coil spring 9 is used as the urging member has been described. However, in the above configuration, since the urging force may be sufficiently increased, the urging member other than the spring, such as rubber, may be used. Elastic members may be used.

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention.
1 illustrates a cross-sectional configuration of a shake correction device according to an embodiment.
The shake correction device is mounted on a lens barrel, a still image and moving image photographing device, and an observation device such as a binocular or a telescope.

In FIG. 2, reference numeral 21 denotes a support frame (shift member) for holding the correction lens L. The support frame 21 is provided with a shift driving coil 23 at one position in the pitch direction and one position in the yaw direction ( (Not shown).

FIG. 2 shows a cross section in the pitch direction of the shake correcting apparatus, and a yaw direction driving means including a coil 23 and having the same configuration as a pitch direction driving means described later is omitted.

The flange portion formed on the outer periphery of the correction lens holding portion of the support frame 21 has a concave portion 21a for accommodating the first ball 31, a movable member 30 and a tension coil spring (biasing member) 29 described later. And a spring hook 21e on which one end of the hook is hooked are provided at three locations in the circumferential direction. The flange portion is disposed rearward in the optical axis direction of a first yoke (fixing member) 24 described later, and the concave portion 21 a faces the first yoke 24.

Further, fitting projections 21d are provided at three or four circumferential positions on the outer periphery of the correction lens holding portion, and have a predetermined angular phase with an inner fitting portion 28a of the lock ring 28 described later. It fits.

Reference numeral 22 denotes a main plate (apparatus main body) attached to a lens barrel (not shown) or the like. A first yoke 24 is fixed to the front end of the base plate 22 with screws, and a second yoke 25 is fixed to the front surface of the rear wall of the base plate 22 with screws. The coil 23 provided on the support frame 21 is disposed between the yokes 24 and 25. The coil 2
Reference numeral 3 is electrically connected to a drive circuit (not shown). The yokes 24 and 25 are each formed in a substantially flat ring shape extending in the pitch driving direction.

A fitting projection 22 is provided on the inner peripheral portion of the base plate 22.
a is formed, and a fitting portion 28b of the lock ring 18 is fitted to the fitting protrusion 22a so as to allow the lock ring 28 to rotate around the optical axis.

Reference numerals 26 and 27 denote magnets, and the yoke 2
4, 25 are magnetically coupled. The yokes 24 and 25, the magnets 26 and 27, and the coil 23, which are opposed to each other, constitute a pitch direction driving means for driving the support frame 21 in the pitch direction, and the correction lens L is held by energizing the coil 23. The support frame 21 is driven in the pitch direction. Similarly, in the yaw direction, the support frame 21 is driven in the yaw direction by energizing a coil (not shown).

A control circuit (not shown) controls a coil (not shown) based on an output from a shake detection sensor (not shown) for detecting a shake in the pitch direction and a shake in the yaw direction provided in the lens barrel, the photographing device, or the observation device. Is controlled by shifting the support frame 21 in the pitch direction and the yaw direction so as to suppress displacement of the image plane in the pitch direction and the yaw direction due to camera shake and the like, thereby correcting the image blur.

The lock ring 28 is driven to rotate around the optical axis by a drive circuit (not shown), and when driven at a predetermined angular phase, a fitting projection 21d formed on the support frame 21 and the inner periphery of the lock ring 28 are formed. The fitting portion 28a is fitted,
The support frame 21 is locked at the center position (the position where the optical axis of the correction lens L matches the optical axis of another lens group in a lens barrel or the like).

The inner peripheral fitting portion 28 of the lock ring 28
When the lock ring 28 is rotationally driven to a position where the angular phase between the “a” and the fitting protrusion 21 d is shifted, the shift driving of the support frame 21 is allowed.

The movable member 30 is formed in a ring shape, and its inner peripheral portion is fitted to the outer periphery of the lens holding portion of the support frame 21,
It is held movably in the optical axis direction.

The first yoke 2 of the movable member 30
4 side, a concave portion 30a is formed.
The second ball 32 is accommodated therein.

The tension coil spring 29 is stretched between the spring hook portion 21 e of the support frame 21 and the spring hook portion 30 c formed on the movable member 30 in a state where the tension coil spring 29 is deformed by tension. Thus, the second ball 32 is urged toward the first yoke 24 which is disposed to face the second ball 32.

As a result, the second ball 32 comes into pressure contact with the optical axis orthogonal surface 30b, which is the bottom surface of the concave portion 30a of the movable member 30, and the optical axis orthogonal surface, which is the front surface of the first yoke 24. The ball 31 presses against the optical axis orthogonal surface 21b which is the bottom surface of the concave portion 21a of the support frame 21 and the optical axis orthogonal surface which is the rear surface of the first yoke 24. That is, the first ball 3
1 is pressed and held between the support frame 21 and the first yoke 24, and the second ball 32 is moved between the movable member 30 and the first yoke 2.
And 4 between them.

In the image stabilizing apparatus configured as described above,
The frictional force generated between the support frame 21 and the movable member 30 and the first yoke 24 when the support frame 21 is shifted is a sufficiently small rolling frictional force as compared with the sliding frictional force.
The urging force (elastic force) of the tension coil spring 29 is applied to the support frame 21.
Even if it is set to a sufficiently strong force that can reliably suppress the tilt of the (correction lens L), extremely good shift drive performance can be secured. Therefore, the coil 23 from the control circuit
Drive control (fine shake correction control) of the support frame 21 can be performed by controlling the energization of the image sensor, for example, for shooting an image without a shake by a recent image pickup device in which the size and the number of pixels are progressing. Can also respond.

Here, the second ball 32 is not directly urged by the spring (the spring and the second ball 32 are brought into direct contact with each other), but the tension between the tension coil spring 29 and the second ball 32 is changed. The surface 30b on which the ball 32 rolls
By interposing the movable member 30 having
The occurrence of sliding friction with the ball 32 can be prevented.

Further, the surface on which the balls 31, 32 roll is used as the surface of the first yoke 24.
It is not necessary to provide a dedicated fixing member for rolling the ball 32, the number of components can be reduced, the weight of the device can be reduced, and the degree of freedom in arranging the balls 31, 32 can be increased.

Also, during the shift driving of the support frame 21 and the like, the recesses 21a, 21a,
30a is formed, and the balls 3 are placed in the recesses 21a, 30a.
Since the rolling range of the balls 31 and 32 is restricted by the peripheral surfaces (rolling restricting portions) other than the bottom surfaces of the concave portions 21a and 30a after the first and the second yokes 24 are accommodated, the first yoke 24 restricts the rolling. It is not necessary to perform processing for forming the portion, and it is possible to suppress an increase in cost.

Further, in this embodiment, the first yoke 2
Since the support frame 21 can be guided in the direction orthogonal to the optical axis by sandwiching the frame 4 from the front and rear, the embodiment frame 21 can be more stably prevented from falling down.

In each of the above embodiments, the support frames 1, 2
1 holds the correction lens L and drives the support frames 1 and 21 in the pitch direction and the yaw direction to shift the optical axis,
The case where the displacement of the image plane in the plane orthogonal to the optical axis is suppressed has been described. The image blur correction can be performed even if the displacement of the image plane position is suppressed.

[0074]

As described above, according to the present invention,
When the shift member is shifted, the ball rolls between the shift member, the movable member, and the fixed member. Therefore, the frictional force generated therebetween is limited to a rolling frictional force smaller than the sliding frictional force. Can be. Therefore, even if the urging force of the urging member is sufficiently increased so as to reliably prevent the shift member from falling down, good shift driving performance can be ensured. Here, instead of directly urging the ball with the urging member (contacting the urging member and the ball directly), a movable member having a surface on which the ball rolls between the urging member and the ball is used. By intervening, the occurrence of sliding friction between the ball and the biasing member can be prevented.

Further, since the fixing member is a yoke which is fixed to the apparatus main body and constitutes the driving means of the shift member, it is not necessary to provide a dedicated fixing member for rolling the ball, and the arrangement of the ball is free. The degree can be increased.

When the yoke and the magnet are arranged in pairs on both sides of the coil in the optical axis direction, the movable member is held by a portion of the shift member disposed between the yokes on both sides. A ball is arranged between the yoke and the movable member and between the other yoke and the shift member, and between the one yoke and the movable member and the other by the urging force generated by the compression deformation of the urging member. When the configuration is such that the ball is sandwiched between the yoke and the shift member, the shift member can be guided in the optical axis orthogonal direction within the width originally required for the two yokes and before and after the optical axis. The thickness in the axial direction is small, and the falling of the shift member can be more stably prevented.

Further, the movable member is disposed on the side of the shift member opposite to the yoke in the direction of the optical axis, and balls are disposed between the yoke and the movable member and between the yoke and the shift member. If the ball is held between the yoke and the movable member and between the yoke and the shift member by the biasing force generated by the tensile deformation of the biasing member, the shift member is sandwiched between the yoke and the shift member in the optical axis direction. The guide can be guided in the direction perpendicular to the optical axis, and the shift member can be more stably prevented from falling.

Further, in order to prevent the ball from deviating from an appropriate rolling range during the shift driving or the like, the ball is rotated by a movable member or a shift member (when the ball is also arranged between the shift member and the fixed member). By forming the rolling restricting portion for restricting the moving range, it is not necessary to perform the processing for forming the rolling restricting portion on the yoke, and the above-mentioned effect can be obtained while suppressing an increase in cost.

[Brief description of the drawings]

FIG. 1 is a sectional view of a shake correction apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a shake correction apparatus according to a second embodiment of the present invention.

FIG. 3 is a perspective view illustrating a schematic configuration of a general shake correction device using a shake detection sensor.

FIG. 4 is a cross-sectional view of a main part showing a configuration of a conventional shake correction apparatus.

[Explanation of symbols]

 L Correction lens 1,21 Support frame (shift member) 2,22 Main plate (device body) 3,23 Coil 4,5,24,25 Yoke (fixing member) 6,7,26,27 Magnet 8,28 Lock ring 9 , 29 Coil spring 10,30 Movable member 11,12,31,32 Ball

Claims (7)

[Claims] An image stabilizing apparatus having a shift member that is shifted and driven in a direction orthogonal to an optical axis to correct image blur, wherein the shift member integrally moves with the shift member in a direction orthogonal to the optical axis. And a movable member held so as to be movable in the optical axis direction, and each of the movable member and the shift member is rotatably disposed between each optical axis orthogonal surface of the movable member and the fixed member. A shake correction, comprising: a ball; and an urging member provided between the movable member and the shift member, the urging member generating an urging force for holding each of the balls between the optical axis orthogonal planes. apparatus. 2. A driving means for generating a shift driving force of the shift member from a yoke and a magnet provided on the apparatus main body and a coil provided on the shift member, wherein the fixing member is a yoke. The shake correction apparatus according to claim 1, wherein 3. The shake correction device according to claim 1, wherein a rolling limiter for limiting a rolling range of the ball is formed on the movable member. 4. The yoke and the magnet are arranged in pairs on both sides in the optical axis direction of the coil, and the movable member is held in a portion of the shift member arranged between the yokes on both sides. And arranging the ball between one of the yokes on the both sides and the movable member and between the other yoke and the shift member, respectively, by an urging force generated by compressive deformation of the urging member. ,
3. The shake correction device according to claim 1, wherein the ball is held between the one yoke and the movable member and between the other yoke and the shift member. 4. 5. The movable member is arranged on a portion of the shift member facing the yoke on the opposite side in the optical axis direction, and between the yoke and the movable member and between the yoke and the shift member. A ball is arranged, and the ball is sandwiched between the yoke and the movable member and between the yoke and the shift member by an urging force generated by a tensile deformation of the urging member. The shake correction device according to claim 1 or 2, wherein 6. The movable member and the shift member,
The shake correcting device according to claim 3, wherein a rolling limit portion for limiting a rolling range of the ball is formed. 7. An optical apparatus comprising the shake correction device according to claim 1.