JP2008039847A - Shake correcting device, optical equipment, and method for manufacturing shake correcting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shake correcting device and optical equipment which can be easily manufactured, and a method for manufacturing the shake correcting device. <P>SOLUTION: The shake correcting device has a cover part 80, a base part, and a movable lens frame arranged between the cover part 80 and the base part and moving on a plane perpendicular to an optical axis when correcting shake. Objective side steel balls 90a and 90b are pressured by rotating the cover part 80 and fixing the cover part 80 and the base part after the objective side steel balls 90a and 90b are inserted between the movable lens frame and the cover part 80 from a steel ball insertion hole 86 provided to a spring part 85 surrounded by the first slit 83 and the second slit 84 of the cover part 80. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a shake correction device, an optical apparatus, and a method for manufacturing a shake correction device.

2. Description of the Related Art As a shake correction device provided in a camera or the like, a shift member having a shake correction lens is supported on a device body by a pair of balls arranged with the shift member interposed therebetween.
JP 2002-196383 A

A conventional blur correction device has a structure in which one of the balls is housed in a movable member provided at the tip of a coil spring that presses the shift member against the device body, and the other is disposed on the opposite side of the movable member with the coil interposed therebetween. Therefore, there is a problem that the manufacturing process becomes complicated.
An object of the present invention is to provide a shake correction device, an optical apparatus, and a method for manufacturing the shake correction device that are easy to manufacture.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although it attaches | subjects and demonstrates the code | symbol corresponding to drawing which shows embodiment of this invention, it is not limited to this.
Invention of Claim 1 is arrange | positioned between the fixing | fixed part (30), the mounting part (80) with which the said fixing | fixed part is mounted in the state facing the said fixing | fixed part, and the said fixing | fixed part and the said mounting part, A moving unit (40) that moves in a plane perpendicular to the optical axis during blur correction; and a first rolling element (90) that is disposed between the moving unit and the mounting unit. The first rolling element is provided between the first position and the second position so as to be movable with respect to the fixed part in a state of facing the moving part, and allows the first rolling element to pass through the first position. The blur correction device (10) including a hole (86) to be allowed and a pressing portion (85) for pressing the first rolling element against the moving portion at the second position.

The invention according to claim 2 is the shake correction apparatus according to claim 1, wherein the pressing portion (85) is a cantilever spring.
According to a third aspect of the present invention, there is provided the blur correction device (10) according to the second aspect, wherein the cantilever spring is formed integrally with the mounting portion (80).
According to a fourth aspect of the present invention, there is provided the shake correction apparatus according to any one of the first to third aspects, wherein the mounting portion (80) is between the first position and the second position. A blur correction device (10) including a guide unit (82, S) for guiding movement.
According to a fifth aspect of the present invention, in the blur correction device according to any one of the first to fourth aspects, the second rolling element is provided between the fixed portion (30) and the moving portion (40). (70) is a blur correction device (10) characterized by being arranged.

According to a sixth aspect of the present invention, in the shake correction apparatus according to any one of the first to fifth aspects, the moving unit (40) is arranged on the moving unit of the first rolling element (90). The blur correction device (10) is provided with a restricting unit (41) that restricts the position of the lens to a predetermined range.
According to a seventh aspect of the present invention, in the blur correction device according to any one of the first to sixth aspects, the moving unit (40) supports the blur correction lens (20) or the imaging device. The blur correction device (10) is characterized.
According to an eighth aspect of the present invention, in the shake correction device according to any one of the first to seventh aspects, the mounting portion (80) is fixed to the fixing portion (30) at the second position. The blur correction device (10) is characterized by that.
A ninth aspect of the invention is an optical apparatus (100) including the blur correction device (10) according to any one of the first to eighth aspects.

According to the invention of claim 10, the mounting portion (80) is disposed so as to be rotatable with respect to the fixed portion (30) provided with the moving portion (40) movable in a plane perpendicular to the optical axis, and the mounting portion The rolling element (90) is inserted between the mounting portion and the moving portion through the hole portion (86) formed in the mounting portion, and the mounting portion is opposed to the moving portion and is fixed to the fixing portion. On the other hand, it is a method of manufacturing a shake correcting device (10), wherein the mounting part is rotated to pressurize the rolling element between the moving part and the mounting part.
According to an eleventh aspect of the present invention, in the method for manufacturing the shake correcting device according to the tenth aspect, the rolling element (90) is moved to the moving portion (40) by the pressing portion (85) provided in the mounting portion (80). A method of manufacturing the shake correcting device (10), wherein pressure is applied between the mounting portion and the mounting portion.
According to a twelfth aspect of the present invention, in the method for manufacturing a shake correcting device according to the tenth or eleventh aspect, the mounting portion (80) is rotated with respect to the fixing portion (30). It is a manufacturing method of the blurring correction apparatus (10) characterized by fixing.
Note that the configuration described with reference numerals may be changed as appropriate, or at least a part of the configuration may be replaced with another component.

  As described above, according to the present invention, after the mounting portion is mounted on the fixed portion, the rolling elements can be arranged and pressed between them, so that the shake correction device can be easily manufactured.

[Embodiment]
Hereinafter, the present invention will be described in more detail with reference to the drawings. In the following embodiments, a camera system will be described as an example of an optical apparatus including a shake correction apparatus.
FIG. 1 is a perspective view illustrating a configuration of a camera system according to an embodiment.
2 is a plan view of the shake correction device provided in the camera system of FIG. 1 as seen from the optical axis direction objective side. FIG. 2A shows a state in which a lid is not attached, and FIG. The state in which the lid portion is mounted is shown.
3 is a cross-sectional view including the optical axis of the shake correction apparatus in FIG. 2, and (a) and (b) are cross-sectional views taken along the line aa and bb in FIG. 2 (b), respectively. A cross-sectional view is shown.

The camera system 100 of the embodiment includes an interchangeable lens 1 and a camera body 2.
The interchangeable lens 1 has a cylindrical shape as a whole, and an end on the image side in the optical axis direction is detachably fixed to the camera body 2 via a mount portion 1a. The interchangeable lens 1 includes a plurality of lens groups (not shown except for the shake correction lens 20) arranged on the optical axis Z.
The interchangeable lens 1 includes a shake correction device 10.
The shake correction device 10 includes a shake correction lens 20, a base 30, a movable lens frame 40, a voice coil motor 50 (VCM 50), a position detection unit 60, an image side steel ball 70, a lid 80, and an objective side steel ball 90. (See FIG. 2 for the base 30, the image-side steel ball 70, the lid 80, and the objective-side steel ball 90).

The blur correction device 10 includes a blur correction lens 20 that is a part of a shooting optical system, a shooting unit (not shown) (not shown) that is arranged on a focal plane of the shooting optical system in a plane substantially orthogonal to the optical axis Z. The image blur in the photographing unit is corrected by moving the subject image in a direction to cancel the image blur of the subject image caused by the camera shake of the photographer.
As shown in FIG. 3, the base 30 includes a main body portion 31, a support portion 32, and a fixing portion 33.
The main body 31 is an annular member, and is arranged in a state in which the central axis thereof substantially coincides with the optical axis Z.
The support portion 32 is a portion formed so as to protrude from the end portion of the main body portion 31 on the image side in the optical axis direction to the inner diameter side of the main body portion 31.

The fixing portion 33 is a portion in which a screw hole 33 a that is screw-coupled to a screw S that fixes a lid portion 80 to be described later to the base portion 30 is formed, and is formed to protrude from the inner peripheral surface of the main body portion 31 toward the inner diameter side thereof. Has been. For example, the fixing portions 33 are provided at three locations around the optical axis Z at substantially equal intervals.
The movable lens frame 40 is a disk-shaped member having an opening at the center thereof, and is inserted on the inner diameter side of the base 30. The aforementioned blur correction lens 20 is attached to the center of the movable lens frame 40.

The VCM 50 is a known electromagnetic actuator that drives the movable lens frame 40 in a biaxial direction perpendicular to the base 30 (hereinafter referred to as X axis and Y axis) in a plane perpendicular to the optical axis Z. . One VCM 50 is provided for the X-axis direction and one for the Y-axis direction.
Hereinafter, the VCM 50, the position detection unit 60, which will be described later, and each element included in these will be described with the symbol x for the X-axis direction and the symbol y for the Y-axis direction. Further, since the configurations of the VCM 50 and the position detection unit 60 are substantially the same for the X-axis direction and the Y-axis direction, here, for the X-axis direction (VCM 50x, position detection unit 60x) Only will be described.

The VCM 50x includes a coil 51x, a magnet 52x, and yokes 53x and 54x.
The coil 51 x is an electric winding element fixed to the movable lens frame 40.
The magnet 52x is a permanent magnet fixed to the support portion 32 of the base 30 in a state of facing the coil 51x.
The yoke 53x is a plate-like magnetic body and is disposed between the magnet 52x and the support portion 32. The yoke 54x is also a plate-like magnetic body similar to the yoke 53x, and is fixed at a position facing the coil 51x in the lid 80.

The position detection unit 60 detects the position of the movable lens frame 40 with respect to the base 30, and includes a position detection unit 60 x for the X-axis direction and a position detection unit 60 y for the Y-axis direction, like the VCM 50. ing.
Among these position detection units 60, the position detection unit 60x is disposed on the opposite side of the VCM 50x with the optical axis Z interposed therebetween, and the position detection unit 60y is disposed on the opposite side of the VCM 50y with the optical axis Z interposed therebetween. .

The position detection unit 60x includes a hall element 61x, a magnet 62x, and a yoke 63x.
The hall element 61x is a known magnetic sensor fixed to the movable lens frame 40x.
The magnet 62x is a permanent magnet fixed to the support portion 32 of the base 30 in a state of facing the hall element 61x.
The yoke 63x is a plate-like magnetic body disposed between the magnet 62x and the support portion 32.

  The image-side steel ball 70 supports the movable lens frame 40 movably in a plane perpendicular to the optical axis Z with respect to the base 30. The image-side steel ball 70 is disposed between the support part 32 of the base 31 and the movable lens frame 40, and faces the support part 32 of the movable lens frame 40 and the surface part of the support part 32 that faces the movable lens frame 40. It is sandwiched between a convex portion that protrudes from the surface portion toward the support portion 32.

For example, three image side steel balls 70 are arranged around the optical axis Z at substantially equal intervals.
These image-side steel balls 70 are held by a steel ball holding part 34 provided on the base 30.
The steel ball holding portion 34 is a cylindrical portion that is provided at an end portion on the inner diameter side of the support portion 32 and is formed extending from the support portion 32 toward the objective side in the optical axis direction. The image side steel ball 70 is accommodated on the inner diameter side of the steel ball holding portion 34.

As shown in FIG. 2, the lid 80 is a plate-like member having a substantially circular planar shape when viewed from the optical axis direction, and is attached to the optical axis direction objective end of the main body 31 of the base 30. Has been. The lid portion 80 includes a substantially circular opening 81 at the center thereof. The opening 81 is provided so as not to block the optical path of the image light incident on the blur correction lens 20.
The lid portion 80 includes a fixing hole 82 at the outer peripheral edge thereof. The fixing holes 82 are provided, for example, at three locations at substantially equal intervals around the optical axis. The fixing hole 82 is a long hole formed by being curved along the outer peripheral edge of the lid 80.
The lid portion 80 is fixed to the base portion 30 by screwing a screw S penetrating the fixing hole 82 into a screw hole 33 a provided in the fixing portion 33 of the base portion 30.

The lid portion 80 includes a first slit 83 and a second slit 84.
The first slit 83 is formed so as to extend in a direction substantially parallel to the radial direction of the lid 80, and one end opens to the inner peripheral edge of the lid 80 and the other end is the lid. The inner peripheral edge 80 and the outer peripheral edge 80 are arranged approximately in the middle. For example, a pair of the first slits 83 are provided across the optical axis Z.

One end of the second slit 84 is formed continuously with the other end of the first slit 83 and extends in the circumferential direction of the lid 80. The second slit 84 has the optical axis Z as a starting point from the other end of the first slit 83 in a plan view of the lid 80 shown in FIG. The lid portion 80 is formed so as to be cut out in the clockwise direction at the center.
As described above, the lid portion 80 has two bowl-shaped slits formed by the first slit 83 and the second slit 84 with the optical axis Z interposed therebetween.

  Here, the region surrounded by the first slit 83 and the second slit 84 in the lid 80 functions as a cantilever spring. For example, a cantilever spring has a beam-shaped member with one end serving as a fixed end and the other end serving as a free end. When the load is removed, the original shape is restored.

Hereinafter, the region surrounded by the first slit 83 and the second slit 84 in the lid portion 80 will be referred to as a spring portion 85. In the spring portion 85, an end portion that functions as a fixed end is referred to as a base end portion, and an end portion that functions as a free end is referred to as a distal end portion.
In the spring portion 85, a boundary portion between the first slit 83 and the second slit 84 is formed in a curved shape. Moreover, the opening part 81 of the cover part 80 has the radial direction dimension larger than the other part in the part in which the spring part 85 is provided.

The spring portion 85 includes a steel ball insertion hole 86.
The steel ball insertion hole 86 is a circular hole formed in a region on the tip end side of the spring portion 85. The diameter dimension of the steel ball insertion hole 86 is larger than the diameter dimension of an objective-side steel ball 90 described later, and the objective-side steel ball 90 can pass therethrough.
Of the edge of the steel ball insertion hole 86, the distance between the portion closest to the tip of the spring 85 and the tip of the spring 85 is, for example, approximately the same as the diameter of the objective steel ball 90. Is set. Hereinafter, the region provided at the distal end portion of the spring portion 85 will be described as a distal end side region 85a.

The objective-side steel ball 90 is disposed between the movable lens frame 40 and the lid portion 80.
The objective-side steel balls 90 support the movable lens frame 40 with respect to the base 30 in cooperation with the image-side steel balls 70, and two objective-side steel balls 90 are arranged with the blur correction lens 20 in between. Among these objective-side steel balls 90, one objective-side steel ball 90a is arranged between a set of Hall elements 61x and 61y, and the other objective-side steel ball 90b is a set of coils 51x and 51y. Arranged between.
These objective-side steel balls 90 are held by a steel ball holding part 41 provided on the movable lens frame 40. The steel ball holding portion 41 is provided at an intermediate portion between the inner diameter side end portion and the outer diameter side end portion of the movable lens frame 40. The steel ball holding portion 41 is a cylindrical portion formed so as to stick out toward the lid portion 80, and the objective side steel ball 90 is accommodated on the inner diameter side of the steel ball holding portion 41.
The diameter of the objective steel ball 90 is set to be larger than the distance between the surface portion of the movable lens frame 40 facing the lid portion 80 and the surface portion of the lid portion 80 facing the movable lens frame 40.

In the camera system 100 described above, when the release switch 3 provided in the camera body 2 is operated, the blur detection sensor 4 provided in the interchangeable lens 1 generates acceleration components in the X-axis direction and the Y-axis direction. Output. Here, the blur around the Y axis is called yawing, and the blur around the X axis is called pitching. The blur correction operation is, for example, image blur caused by the blur in these two directions. This is done by correcting.
Based on the output of the shake detection sensor 4, the shake correction apparatus 10 calculates the drive direction and drive amount of the shake correction lens 20 by a calculation unit (not shown), and uses the VCM 50 and the position detection unit 60 according to the calculation result. The correction lens 20 is driven and controlled to correct image blur.

Next, a manufacturing method of the shake correction apparatus 10 provided in the camera system 1 of the embodiment will be described.
4 is a view showing a method of manufacturing the shake correction apparatus shown in FIG. 2, and is a cross-sectional view taken along the line IV-IV in FIG. 2 (b). FIGS. 4A and 4B show states before and after the rotation of the lid.
The shake correction apparatus 10 is manufactured with the base 30 fixed. At this time, for example, the central axis of the base 30 is disposed in a substantially vertical direction, and the end on the side where the support portion 32 is provided is disposed below.
In the base portion 30, the image side steel ball 70 is inserted into the steel ball holding portion 34, and the movable lens frame 40 is placed above the image side steel ball 70.

Thereafter, the lid 30 is attached to the base 30.
At this time, the lid portion 80 is mounted in a state where the steel ball insertion hole shown in FIG. 4A is overlapped in the vertical direction with respect to the steel ball holding portion 41 of the movable lens frame 40. Hereinafter, the position of the lid portion 80 at this time will be described as a first position.
Next, the objective steel ball 90 is accommodated in the steel ball holding portion 41 of the movable lens frame 40.
Since the diameter of the steel ball insertion hole 86 is set to be larger than the diameter of the objective-side steel ball 90, when the lid 80 is in the first position, the objective-side steel ball 90 passes through the steel ball insertion hole 86. And can be accommodated in the steel ball holding part 41.

Further, the position of the screw hole 82 of the lid 80 is set so as to overlap the fixing portion 33 of the base 30 in the vertical direction in a state where the lid 80 is disposed at the first position. The screw hole 82 of the lid portion 80 is a long hole formed along the outer peripheral edge of the lid portion 80, and the screw S is a region on one end side along the circumferential direction of the edge portion of the screw hole 82. To penetrate.
The screw S that has passed through the screw hole 82 is screwed to the screw hole 33a of the fixing portion 33. In this first position, the screw S is, for example, about half of the region where the screw thread is formed, and the lid portion 80 is temporarily fixed so as to be rotatable with respect to the base portion 30. It is said.

The lid 80 is then rotated relative to the base 30 from the first position. At this time, the rotation direction and the rotation angle of the lid portion 80 are guided by the screw S and the screw hole 82. The screw hole 82 of the present embodiment is formed so as to guide the rotation of the lid 80 in the clockwise direction when the lid 80 is viewed from above in the vertical direction, that is, from the optical axis direction objective side.
When the lid 80 is viewed from the optical axis direction objective side, the second slit 84 starts from the other end of the first slit 83, and the lid 80 is notched in the clockwise direction. Therefore, when the lid 80 is rotated clockwise, the opening of the steel ball holding portion 41 provided in the movable lens frame 40 is closer to the tip than the steel ball insertion hole 86 of the spring portion 85. It is closed by a tip side region 85a formed in the region.
Hereinafter, the position of the lid part 80 when the steel ball holding part 41 is closed by the distal end side region 85a of the spring part 85 will be referred to as a second position.

Here, the objective steel ball 90 has a diameter dimension set to be larger than the distance between the surface portion of the movable lens frame 40 facing the lid portion 80 and the surface portion of the lid portion 80 facing the movable lens frame 40. . Therefore, the objective-side steel ball 90 presses the peripheral portion of the portion of the lid portion 80 where the steel ball insertion hole 86 is formed when the lid portion 80 rotates to close the steel ball holding portion 41.
When the spring portion 85 is pressed by the objective steel ball 90 which is a sphere, the tip end side region 85a is displaced upward (see FIG. 4B). And since the spring part 85 functions as a cantilever spring, it tries to restore | restore to an original shape.
As a result, the distal end side region 85 a presses the objective steel ball 90 against the movable lens frame 40, and the spring portion 85 functions as a pressing spring that prevents rattling of the base 30 of the movable lens frame 40.
The lid 80 is fixed to the base 30 by being screw-coupled to the screw hole 33a of the fixing portion 33 in the entire region where the thread of the screw S is formed at the second position.

As described above, according to the shake correction apparatus 10 and the manufacturing method thereof of the present embodiment, the following effects can be obtained.
(1) Since the separation of the objective-side steel ball 90 from the steel ball holding portion 41 can be restricted by rotating the lid portion 80 with respect to the base portion 30, the shake correction device 10 can be easily manufactured. In addition, since the movable lens frame 40 side can be pressed against the base 30 by the spring portion 85 formed on the lid portion 80, for example, compared to a case where a separate presser spring is attached to the lid portion 80, the blur correction device 10 is manufactured. Is easy.
(2) Since the spring portion 85 that presses the objective-side steel ball 90 has a cantilever spring structure and is integrally formed with the lid portion 80, the number of parts can be reduced and the cost of the shake correction device 10 can be reduced.
(3) After the objective-side steel ball 90 is accommodated in the steel ball holding portion 41, the lid portion 80 is temporarily fixed to the base portion 30 by the screw S, so that the lid portion 80 is bent while the spring portion 85 is bent. When fixing to the base portion 30, the lid portion 80 can be prevented from floating from the base portion 30 due to the reaction force of the spring portion 85. This eliminates the need to assemble while holding the lid 80 against the base 30, thereby facilitating the assembling work of the shake correction apparatus 10.
(4) Since the rotation direction of the lid 80 is guided by the fixing hole 82 formed in the lid 80, the shake correction apparatus 10 can be easily manufactured.
(5) Since the image-side steel ball 70 is disposed between the movable lens frame 40 and the base 30, the operation of the movable lens frame 40 is stabilized.
(6) Since the objective side steel ball 90 is accommodated in the steel ball holding part 41, it is possible to prevent the objective side steel ball 90 from falling off the movable lens frame 40.

[Deformation]
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the technical scope of the present invention.
(1) The configuration of the shake correction apparatus of the present invention is not limited to that described in the embodiment, and can be changed as appropriate. For example, the shake correction device of the embodiment drives the shake correction lens in a plane perpendicular to the optical axis. However, the present invention is not limited to this. For example, the image pickup device is driven in a plane parallel to the image pickup surface. You may do.
(2) In the embodiment, the rolling element is a steel ball, but is not limited thereto, and may be a ceramic ball, for example.
(3) The lid portion of the embodiment rotates and moves from the first position to the second position, but is not limited thereto, and may be, for example, a straight movement.

It is a perspective view which shows the structure of the camera system of embodiment. It is the top view which looked at the blurring correction apparatus with which the camera system of FIG. 1 was equipped from the optical axis direction objective side. It is sectional drawing containing the optical axis of the blurring correction apparatus of FIG. It is a figure which shows the manufacturing method of the blurring correction apparatus of FIG.

Explanation of symbols

1 Interchangeable Lens: 10 Shake Correction Device: 20 Shake Correction Lens: 30 Base: 40 Movable Lens Frame: 80 Lid: 86 Steel Ball Insertion Hole: 90 Objective Side Steel Ball: 100 Camera System

Claims (12)

A fixed part;
A mounting part mounted on the fixed part in a state of facing the fixed part;
A moving unit disposed between the fixed unit and the mounting unit and moving in a plane perpendicular to the optical axis during blur correction;
A first rolling element disposed between the moving part and the mounting part,
The mounting part is
While being provided to be movable with respect to the fixed portion in a state of facing the moving portion between the first position and the second position,
A hole allowing passage of the first rolling element at the first position;
And a pressing unit that presses the first rolling element against the moving unit at the second position. The blur correction device according to claim 1,
The blur correction device, wherein the pressing portion is a cantilever spring. The blur correction device according to claim 2,
The shake correction device, wherein the cantilever spring is formed integrally with the mounting portion. In the blurring correction apparatus according to any one of claims 1 to 3,
A shake correction apparatus comprising: a guide unit that guides movement of the mounting unit between the first position and the second position. In the blur correction device according to any one of claims 1 to 4,
A blur correction device, wherein a second rolling element is disposed between the fixed portion and the moving portion. In the blurring correction apparatus according to any one of claims 1 to 5,
The movement correcting unit includes a limiting unit that limits a position of the first rolling element on the moving unit within a predetermined range. The blur correction device according to any one of claims 1 to 6,
The moving unit supports a shake correcting lens or an image sensor. The blur correction device according to any one of claims 1 to 7,
The shake correction device, wherein the mounting portion is fixed to the fixing portion at the second position. An optical apparatus comprising the blur correction device according to claim 1. The mounting part is arranged so as to be rotatable with respect to a fixed part provided with a moving part movable in a plane perpendicular to the optical axis,
Inserting a rolling element between the mounting part and the moving part through a hole formed in the mounting part,
The shake correction comprising rotating the mounting portion relative to the fixed portion with the mounting portion facing the moving portion to pressurize the rolling element between the moving portion and the mounting portion. Device manufacturing method. In the manufacturing method of the blurring correction device according to claim 10,
A method of manufacturing a shake correction apparatus, comprising: pressing the rolling element between the moving unit and the mounting unit by a pressing unit provided in the mounting unit. In the manufacturing method of the blurring correction device according to claim 10 or 11,
A method for manufacturing a shake correction apparatus, wherein the mounting portion is fixed to the fixing portion in a state where the mounting portion is rotated with respect to the fixing portion.

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