JP5365088B2 - Image shake correction apparatus and optical apparatus using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem wherein an axial backlash is generated to worsen vibration control performance, when a moving guide rail unit and an imaging element unit move X-directionally and Y-directionally respectively along fixed guide rails and a guide rail part, in a conventional image blurring correction device. <P>SOLUTION: A plate spring 6 for energizing X-directionally a Y-directional guide frame 2 inside a storage part 1a is provided inside the first clearance 4 formed between an inner circumference of the storage part 1a of a base panel 1 and an outer circumference of the Y-directional guide frame 2, a plate spring 15 for energizing Y-directionally an X-directional guide frame 3 inside an opening part 2a is provided inside the second clearance 10 formed between an inner circumference of the opening part 2a of the Y-directional guide frame 2 and an outer circumference of the X-directional guide frame 3, and the Y-directional guide frame 2 and the X-directional guide frame 3 are thereby prevented respectively from backlashing, inside the storage part 1a and the opening part 2a opened toward a plane direction (XY-direction) perpendicular to an optical axis (Z-axis) of an imaging lens group 107 of an optical system. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an image blur correction apparatus that corrects image blur by displacing an image sensor, and an optical apparatus using the same.

  Conventionally, as this type of image blur correction apparatus, for example, there is one in a digital camera disclosed in Patent Document 1.

This image shake correction apparatus is configured by mounting a moving guide rail unit on which an image sensor unit is mounted on a support substrate fixed in the body of a camera. The support substrate is formed in a rectangular plate shape having long sides in the X direction, and a fixed guide rail extends in the X direction. The moving guide rail unit has a connection portion provided at an end thereof attached to a support substrate via a fixed guide rail, and is supported by the fixed guide rail so as to be movable in the X direction with respect to the support substrate. Further, the moving guide rail unit includes a guide rail portion extending in the Y direction, and the imaging element unit is mounted on the moving guide rail unit so as to be movable in the Y direction via the guide rail portion. The image sensor unit holds an image sensor such as a CCD (Charge Coupled Device), and the image blur correction device cancels the camera shake of the photographer in a plane perpendicular to the Z direction along the optical axis. The moving guide rail unit is displaced in the X direction, and the imaging element unit is displaced in the Y direction.
JP 2006-106168 A

  However, the conventional image blur correction device disclosed in Patent Document 1 is configured so that each of the moving guide rail unit and the imaging element unit moves in the X direction and the Y direction along the fixed guide rail and the guide rail portion, respectively. The gap between the guide rails causes the shaft backlash to deviate from the direction along each guide rail. Therefore, in the conventional image shake correction apparatus, the anti-shake performance is deteriorated due to the axial backlash, and the camera shake correction cannot be performed more accurately.

  Further, this axial backlash occurs in the Z direction along the optical axis, and in the X and Y directions in the imaging surface of the imaging device perpendicular to the Z direction. For this reason, even if it is adjusted so as to suppress the axial play in the optical axis direction, the axial play in each direction in the plane perpendicular to the optical axis becomes larger on the contrary, making it difficult to adjust the axial play. . Therefore, it is difficult to manufacture the conventional image blur correction apparatus while maintaining both the accuracy of the optical axis direction and each direction in a plane perpendicular to the optical axis.

The present invention has been made to solve such problems,
A base having a storage portion opened in a plane direction perpendicular to the optical axis of the optical system, and an outer periphery arranged with a predetermined first gap from the inner periphery of the storage portion, and being perpendicular to the optical axis of the optical system in the storage portion A first guide frame having an opening that is movable in a plane and is open in a plane direction perpendicular to the optical axis of the optical system, and a first guide frame that is provided on the outer periphery of the first guide frame and that is substantially orthogonal to the optical axis. A first projecting portion projecting in the direction and having a recess formed at the tip thereof, and fixed to the inner periphery of the storage portion, and attached in a direction away from the inner peripheral surface of the storage portion in the first direction . a first elastic member arcuate you energized, and between the recess and the first elastic member of the first protrusion of the first guide frame on the opposite side to the side where the first protrusion is provided and between the outer periphery and the inner periphery of the housing part, in a first rolling element which is supported, the first guide frame in the plane perpendicular to the optical axis There are a first driving means for moving in a different second direction the first direction, the outer periphery is perpendicular to the optical axis plane of the optical system in being arranged with a predetermined second gap from the inner periphery of the opening in the opening A second guide frame that holds an image sensor that picks up an image formed by an optical system, and is provided on the outer periphery of the second guide frame, and protrudes in the second direction and has a recess at the tip. a second projecting portion which is fixed to the inner periphery of the opening in the second direction, and the second elastic body arcuate you urged in a direction away from the inner circumferential surface of the second projecting portion, wherein Between the recess of the second protrusion and the second elastic body, and between the outer periphery of the second guide frame and the inner periphery of the opening opposite to the side on which the second protrusion is provided. , in a second rolling element being supported, image blur and a second driving means for moving the second guide frame in a first direction complement You configure the device.

  According to this configuration, the first guide frame is urged in the first direction in the storage portion within the first gap formed between the inner periphery of the base storage portion and the outer periphery of the first guide frame. An elastic body is provided and urges the second guide frame in the second direction within the opening in a second gap formed between the inner periphery of the opening of the first guide frame and the outer periphery of the second guide frame. Since the second elastic body is provided, it is possible to prevent the first guide frame and the second guide frame from rattling in the housing portion and the opening portion that are open in the plane direction perpendicular to the optical axis of the optical system. Therefore, the first guide frame and the second guide frame do not rattle in a plane perpendicular to the optical axis of the optical system, and the conventional image blur correction device that moves the moving guide rail unit along the fixed guide rail, There is no axial backlash in the plane perpendicular to the optical axis, and the image stabilization performance of the image shake correction apparatus is improved, and it is possible to perform camera shake correction more accurately.

  The first guide frame is housed in a housing portion opened in a plane direction perpendicular to the optical axis of the optical system, and the second guide frame is perpendicular to the optical axis of the optical system formed in the first guide frame. Since the image blur correction apparatus is housed in the opening that opens in the surface direction, the thickness of the image blur correction apparatus in the optical axis direction is reduced. Accordingly, there is provided an image blur correction device capable of reducing the installation space while improving the image stabilization performance.

  According to this configuration, the first rolling element is provided between the base housing portion and the first elastic body that are in contact with each other when the first guide frame moves, and the first guide that is in contact with the second guide frame when the second guide frame moves. Since the second rolling element is provided between the opening of the frame and the second elastic body, the frictional resistance generated with the movement of the first guide frame and the second guide frame is reduced. For this reason, the first driving means and the second driving means can move the first guide frame and the second guide frame with a small driving force.

  Further, the present invention is characterized in that a third rolling element is provided between the base in the optical axis direction of the optical system and the second guide frame.

  According to this structure, the 2nd guide frame holding an image pick-up element is supported by a base | substrate via a 3rd rolling element, without passing through a clearance gap. Therefore, the position of the optical system of the second guide frame in the optical axis direction does not wobble. For this reason, unlike the conventional image blur correction apparatus that moves the moving guide rail unit along the fixed guide rail, there is no axial backlash in the optical axis direction.

A mechanism that prevents the first elastic body and the second elastic body from rattling the first guide frame and the second guide frame in a plane direction perpendicular to the optical axis of the optical system in the storage section and the opening; The mechanism that prevents the second guide frame from rattling in the optical axis direction is independent of the third rolling element. Therefore, the mechanism in each of the surface direction perpendicular to the optical axis of the optical system and the optical axis direction can be adjusted independently, and if one is adjusted and changed as in the past, the other is adjusted accordingly. There is no situation that must be done. For this reason, the adjustment of the mechanism in each direction of the image blur correction device is facilitated, and it becomes easy to manufacture while maintaining both the accuracy of the optical axis direction and each direction in a plane perpendicular to the optical axis.
Further, the positional accuracy of the optical system of the second guide frame in the optical axis direction is determined by the accuracy of the outer diameter of the third rolling element. Since the manufacturing accuracy of the outer circumferential circle of the third rolling element is generally high, the positional accuracy of the optical system of the second guide frame in the optical axis direction is determined with high accuracy.

Further, in the present invention, the second driving means includes a magnet provided on the second guide frame or the base and a coil provided on the base or the second guide frame so as to face the magnet.
The base or the second guide frame includes a magnetic body at a position facing the magnet via the coil.

  According to this configuration, the magnet and the magnetic body are attracted to each other in the optical axis direction by the magnetic force generated by the magnet, and the base and the second guide frame are attracted to each other. For this reason, the 3rd rolling element can be clamped between the 2nd guide frame and a base using the magnet of the 2nd drive means which moves the 2nd guide frame to the 1st direction. Therefore, it is not necessary to newly provide a special means for this clamping, and the cost can be reduced by reducing the number of component parts of the image blur correction apparatus. Further, since the third rolling element is sandwiched between the second guide frame and the base by the magnetic force, it is possible to reduce the frictional resistance when the second guide frame moves.

Further, in the present invention, the third rolling element is provided at three positions between the base and the second guide frame around the image sensor held by the second guide frame,
A pair of a magnet and a magnetic body is provided at two symmetrical positions sandwiching the image sensor held by the second guide frame.

  According to this configuration, the second guide frame is stably supported with respect to the base by the three third rolling elements centered on the image sensor, and is attracted to the base at two positions sandwiching the image sensor. For this reason, the image sensor is stably held by the second guide frame without being inclined with respect to the base in the optical axis direction of the optical system.

  According to another aspect of the present invention, there is provided an image shake correction apparatus according to any one of claims 1 to 5, a shake detection unit that detects each shake in the first direction and the second direction, and the shake detection unit. The optical apparatus is configured to include a correction control unit that performs drive control of the first drive unit and the second drive unit according to the detection output to correct and control the position of the image sensor.

  According to this configuration, the shake that occurs in the optical apparatus at the time of shooting is detected by the shake detection unit, and the correction control unit controls the drive of the first drive unit and the second drive unit and detects the shake detected by the shake detection unit. The first guide frame and the second guide frame are moved in the second direction and the first direction so as to cancel each other, thereby correcting and controlling the position of the image sensor. For this reason, the image blur generated in the optical apparatus at the time of photographing can be suppressed similarly to the above-described image blur correction apparatus.

  According to the image shake correction apparatus of the present invention, as described above, the first guide frame and the second guide frame are rattled in the storage portion and the opening portion that are open in the plane direction perpendicular to the optical axis of the optical system. Is prevented. Accordingly, the image stabilization performance of the image shake correction apparatus is improved, and it is possible to perform camera shake correction more accurately. In addition, since the thickness of the image shake correction apparatus in the optical axis direction is reduced, an image shake correction apparatus that can reduce the installation space while improving the image stabilization performance is provided.

  Next, the case where the image blur correction apparatus according to the best embodiment of the present invention is used in a camera will be described.

  FIG. 1 is a side view illustrating the outline of the configuration of the camera according to the present embodiment.

  The camera 100 is an optical device that includes a body 101 and a lens barrel 102. The body 101 is formed in a substantially rectangular container shape, and includes a yawing detection gyro 103 and a pitching detection gyro 104, a control device 105, and an image blur correction device 106 therein. The lens barrel 102 is formed in a substantially cylindrical shape and is fixed to the body 101, and a photographing lens group 107 that forms a subject image on an imaging surface of an imaging device provided in the image blur correction device 106 on the inner diameter side thereof. Is housed. The camera 100 may be configured such that the lens barrel 102 is detachably fixed to the body 101.

  The yawing detection gyro 103 and the pitching detection gyro 104 are angular velocity sensors that respectively detect rotation (shake) in the yawing direction and the pitching direction of the camera 100 caused by camera shake or the like. In the present embodiment, the optical axis of the lens barrel 102 is defined as the Z-axis, and an axis that is orthogonal to the Z-axis and that extends along the long side of the imaging surface of the imaging device (lateral direction during normal position shooting). An axis that is orthogonal to the X axis, the Z axis, and the X axis is defined as a Y axis. Further, a shake that the camera 100 rotates about the X axis is referred to as pitching, and a shake that the camera 100 rotates about the Y axis is referred to as yawing.

  The control device 105 includes a central processing unit (CPU (Central Processing Unit)) that processes signals output from the yawing detection gyro 103 and the pitching detection gyro 104, and a driver unit that drives an actuator described later of the image shake correction device 106. It has. The control device 105 calculates components in the X direction (first direction) and the Y direction (second direction) of shake from the yawing and pitching detected by the yawing detection gyro 103 and the pitching detection gyro 104. The yawing detection gyro 103, the pitching detection gyro 104, and the control device 105 constitute a shake detection unit that detects each shake in the X direction and the Y direction. Further, the control device 105 controls the drive of a Y-direction drive VCM (Voice Coil Motor) and an X-direction drive VCM, which will be described later, as actuators in accordance with the detection output of the shake detection means, and determines the position of the image sensor. A correction control means for performing correction control is configured.

  FIG. 2 is a rear view of the image blur correction device 106 shown in FIG. 1 as viewed from the control device 105 side in the optical axis direction.

  The image blur correction device 106 includes a disk-shaped base 1, a rectangular frame-shaped Y-direction guide frame 2, and a rectangular plate-shaped X-direction guide frame 3.

  The base 1 has a storage portion 1a that opens in a plane direction (XY direction) perpendicular to the optical axis (Z axis) of the optical system constituted by the photographing lens group 107, and a Y-direction guide frame is provided in the storage portion 1a. 2 is stored. The Y-direction guide frame 2 constitutes a first guide frame whose outer periphery is arranged with a predetermined first gap 4 from the inner periphery of the storage portion 1a of the base 1, and the optical system in the storage portion 1a. It can move in the XY plane perpendicular to the optical axis. The Y-direction driving VCM 5 constitutes a first driving means for moving the Y-direction guide frame 2 in the Y direction as described later by a magnetic force. The first gap 4 is provided with a leaf spring 6 having one end fixed to the inner periphery of the storage portion 1a, and the other end that moves freely is an arc-shaped bent portion via a ball 7 in the Y-direction guide frame. 2 is in contact with the outer periphery. The leaf spring 6 constitutes a first elastic body that urges the Y-direction guide frame 2 in the X direction within the storage portion 1a.

  The ball 7 is provided between the outer periphery of the Y-shaped guide frame 2 urged by the leaf spring 6 and recessed in a concave shape, and between the leaf springs 6 facing the outer periphery. Further, the balls 8 and 9 are provided in the first gap 4 between the base 1 narrowed by the leaf spring 6 and the Y-direction guide frame 2, and the inner circumference of the storage portion 1 a is recessed in the concave shape, and the Y-direction guide facing the inner circumference. It is provided between the outer peripheries of the frame 2. The balls 7 to 9 are made of steel balls or ceramic balls and constitute first rolling elements.

  The Y-direction guide frame 2 has an opening 2a opened in a plane direction (XY direction) perpendicular to the optical axis (Z-axis) of the optical system, and the X-direction guide frame 3 is provided in the opening 2a. Stored. The X-direction guide frame 3 constitutes a second guide frame whose outer periphery is disposed with a predetermined second gap 10 from the inner periphery of the opening 2 a, and an image formed by the photographing lens group 107. The image sensor 11 which consists of CCD which images this is provided. The X-direction guide frame 3 can freely move in the XY plane perpendicular to the optical axis of the optical system in the opening 2a. The base 1, the Y direction guide frame 2, and the X direction guide frame 3 are formed of a material containing 20% glass in a polycarbonate resin. The X-direction drive VCMs 12 and 13 provided at two symmetrical positions sandwiching the image sensor 11 constitute second drive means for moving the X-direction guide frame 3 in the X direction by a magnetic force as will be described later. Yes. The positions in the X and Y directions of the image sensor 11 displaced by the Y direction driving VCM 5 and the X direction driving VCMs 12 and 13 will be described later by the X direction position detecting element 14 and the Y direction position detecting element 19. Detected.

  The second gap 10 is provided with a leaf spring 15 having one end fixed to the inner periphery of the opening 2 a, and the other end that moves freely is an arcuately bent portion via a ball 16. 3 is in contact with the outer periphery. The leaf spring 15 constitutes a second elastic body that biases the X-direction guide frame 3 in the Y direction within the opening 2a. The balls 16 are provided between the outer periphery of the X-direction guide frame 3 urged by the plate spring 15 and recessed in a concave shape, and between the plate springs 15 facing the outer periphery. Further, the balls 17 and 18 are provided between the inner periphery of the second gap 10 narrowed by the leaf spring 15 and recessed in the concave shape of the opening 2a and the outer periphery of the X-direction guide frame 2 facing the inner periphery. . The balls 16 to 18 are made of steel balls or ceramic balls and constitute a second rolling element.

  Further, between the base 1 in the optical axis direction (Z direction) of the photographing lens group 107 and the X direction guide frame 3, balls 20 to 22 made of steel balls or ceramic balls are sandwiched as third rolling elements. ing. These balls 20 to 22 are provided at three locations of the base 1 and the X-direction guide frame 3 around the image sensor 11 held by the X-direction guide frame 3.

  3 is a cross-sectional view of the image blur correction device 106 shown in FIG. 2 taken along the line III-III and viewed from the direction of the arrows. In the figure, the same parts as those in FIG.

  The imaging device 11 is mounted on an FPC (flexible printed circuit board) 23 and fixed to the X direction guide frame 3. The FPC 23 is connected to the control device 105, and a signal from the image sensor 11 is output to the control device 105 via the FPC 23.

  Each of the X-direction drive VCMs 12 and 13 includes rectangular metal yokes 12a and 13a, magnets 12b and 13b having the same rectangular shape as the yokes 12a and 13a, and elliptical VCM coils 12c and 13c. ing. The magnets 12b and 13b are fixed via two yokes 12a and 13a on the X-direction guide frame 3 with the image pickup device 11 interposed therebetween, and are in positions facing the VCM coils 12c and 13c. The VCM coils 12c and 13c are fixed to the base 1 via metal yokes 12d and 13d.

  When a current is passed through the VCM coils 12c and 13c, a Lorentz force is generated between the VCM coils 12c and 13c and the magnets 12b and 13b due to the magnetic field generated by the magnets 12b and 13b, and the magnets 12b and 13b are fixed. The direction guide frame 3 moves in the X direction. Further, when a current is passed through the VCM coils 12c and 13c in the reverse direction, Lorentz force is generated in the reverse direction. Therefore, by controlling the polarity and magnitude of the current flowing through the VCM coils 12c and 13c, the movement of the image sensor 11 in the X direction can be controlled.

  The base 1 is provided with metal yokes 12d and 13d having a rectangular shape slightly larger than the magnets 12b and 13b as magnetic bodies at positions facing the magnets 12b and 13b via the VCM coils 12c and 13c. Yes. The pairs of the magnets 12b and 13b and the yokes 12d and 13d are provided at two symmetrical positions sandwiching the image sensor 11 held by the X-direction guide frame 3, and the X-direction guide to which the magnets 12b and 13b are fixed. The frame 3 is attracted by a magnetic force to the base 1 on which the yokes 12d and 13d are fixed.

  The X-direction position detecting element 14 provided on the left side of the X-direction driving VCM 12 has the same rectangular shape as the yoke 14a fixed to the X-direction guide frame 3 through a rectangular metal yoke 14a. And a hall element 14c mounted on the FPC 25 and fixed to the base 1. The Hall element 14c is located at a position facing the magnet 14b, detects the magnetism generated by the magnet 14b, and detects the displacement in the X direction of the X direction guide frame 3 with respect to the base 1.

  The Y-direction guide frame 2 and the X-direction guide frame 3 are stored in the storage portion 1a of the base 1 as described above, and a lid 24 made of a magnetic material or a nonmagnetic material is provided on the opened upper portion of the storage portion 1a. The Y-direction guide frame 2 is prevented from being detached outside the storage portion 1a.

  FIG. 4 is a cross-sectional view of the image blur correction device 106 shown in FIG. 2 taken along line IV-IV and viewed from the direction of the arrow. In the figure, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted.

  The Y-direction drive VCM 5 provided above the base 1 is fixed to the Y-direction guide frame 2 via a metal yoke 5a having a long rectangular shape in the X direction, and has a magnet 5b having the same rectangular shape as the yoke 5a. And a VCM coil 5c having an elliptical shape long in the X direction fixed to the base 1. The Y-direction drive VCM 5 moves the Y-direction guide frame 2 in the Y direction on the same principle as the X-direction drive VCMs 12 and 13 described above. Therefore, by controlling the polarity of the current flowing through the VCM coil 5c and the magnitude of the current, the movement of the image sensor 11 in the Y direction can be controlled.

  The Y-direction position detecting element 19 provided below the Y-direction drive VCM 5 is the same rectangle as the metal yoke 19a fixed to the X-direction guide frame 3 via a rectangular metal yoke 19a. A magnet 19b having a shape and a Hall element 19c mounted on the FPC 26 and fixed to the base 1 are formed. The Y-direction position detecting element 19 detects the position of the imaging element 11 in the Y direction with respect to the base 1 on the same principle as the X-direction position detecting element 14 described above.

  Next, the operation of the image shake correction apparatus according to this embodiment having the above-described configuration will be described.

When the body 101 of the camera 100 shakes due to camera shake or the like, the yawing detection gyro 103 and the pitching detection gyro 104 detect the rotation (shake) of the yawing direction and the pitching direction of the camera 100, respectively, and control the detection signals via the FPC 23. Output to the device 105. The control device 105 that has received the detection signal calculates components in the X direction and Y direction of the shake generated in the body 101 from the yawing and pitching detected by the yawing detection gyro 103 and the pitching detection gyro 104.
Then, the Y direction guide VCM 5 and the X direction drive VCMs 12 and 13 are controlled according to the calculated X direction and Y direction components of the shake so that the detected shake is canceled out. The position of the image sensor 11 is corrected and controlled by moving the frame 2 and the X-direction guide frame 3 in the Y direction and the X direction. At this time, the Y-direction driving VCM 5 moves the relative positions of the base 1 and the Y-direction guide frame 2 in the Y direction via the balls 7 to 9, and the X-direction driving VCMs 12 and 13 move the balls 16 to 18. The relative position of the Y direction guide frame 2 and the X direction guide frame 3 is moved in the X direction. Therefore, even if hand shake occurs in the camera 100 at the time of shooting, the image pickup device 11 moves so as to cancel it, so no blur occurs in the shot image.

  According to such an image blur correction device 106 according to the present embodiment, the Y-direction guide is formed in the first gap 4 formed between the inner periphery of the storage portion 1 a of the base 1 and the outer periphery of the Y-direction guide frame 2. A leaf spring 6 that urges the frame 2 in the X direction within the storage portion 1 a is provided, and is formed between the inner periphery of the opening 2 a of the Y direction guide frame 2 and the outer periphery of the X direction guide frame 3. Since a leaf spring 15 for urging the X direction guide frame 3 in the Y direction within the opening 2a is provided in the gap 10, it is perpendicular to the optical axis (Z axis) of the photographing lens group 107, which is an optical system. The Y-direction guide frame 2 and the X-direction guide frame 3 are prevented from rattling in the storage portion 1a and the opening portion 2a that are open in a smooth plane direction (XY direction). Therefore, the Y-direction guide frame 2 and the X-direction guide frame 3 do not rattle in the XY plane perpendicular to the optical axis (Z-axis) of the optical system, and an image of moving the conventional moving guide rail unit along the fixed guide rail. As in the case of the shake correction device, there is no axial backlash in the XY plane perpendicular to the optical axis, and the image stabilization performance of the image shake correction device 106 is improved, so that camera shake correction can be performed more accurately.

  The Y-direction guide frame 2 is housed in a housing portion 1a that opens in the XY plane direction perpendicular to the optical axis of the optical system, and the X-direction guide frame 3 is an optical system formed on the Y-direction guide frame 2. Therefore, the image blur correction device 106 has a small thickness in the optical axis direction (Z direction) because it is housed in the opening 2a that opens in the XY plane direction perpendicular to the optical axis. Therefore, the image blur correction device 106 capable of reducing the installation space while improving the image stabilization performance is provided.

  Moreover, in this embodiment, when the X direction guide frame 3 moves, the balls 7-9 are provided between the storage part 1a of the base | substrate 1 which contacts when the Y direction guide frame 2 moves, and the leaf | plate spring 6. As shown in FIG. Since the balls 16 to 18 are provided between the opening 2a of the Y-direction guide frame 2 and the leaf spring 15, the frictional resistance generated with the movement of the Y-direction guide frame 2 and the X-direction guide frame 3 is Decrease. For this reason, the Y-direction driving VCM 5 and the X-direction driving VCMs 12 and 13 can move the Y-direction guide frame 2 and the X-direction guide frame 3 with a small driving force.

  In the present embodiment, the X-direction guide frame 3 that holds the image sensor 11 is supported by the base 1 via the balls 20 to 22 without a gap. Therefore, the position in the optical axis direction (Z direction) of the optical system of the X direction guide frame 3 does not rattle. For this reason, unlike the conventional image blur correction apparatus that moves the moving guide rail unit along the fixed guide rail, there is no axial backlash in the optical axis direction.

  Further, the leaf spring 6 and the leaf spring 15 prevent the Y-direction guide frame 2 and the X-direction guide frame 3 from rattling in the XY plane direction perpendicular to the optical axis of the optical system in the storage portion 1a and the opening 2a, respectively. The mechanism for preventing the X-direction guide frame 3 from rattling in the optical axis direction (Z direction) by the balls 20 to 22 is independent. Therefore, the mechanism in each direction of the XY plane direction perpendicular to the optical axis of the optical system and the optical axis direction (Z direction) can be adjusted independently, and if one is adjusted and changed as in the past, depending on it, There is no situation where the other must be adjusted. For this reason, the adjustment of the mechanism in each direction of the image blur correction device 106 becomes easy, and it becomes easy to manufacture while maintaining both the accuracy of the optical axis direction and each direction in the XY plane perpendicular to the optical axis. Further, the positional accuracy in the optical axis direction (Z direction) of the optical system of the X direction guide frame 3 is determined by the accuracy of the outer diameter of the balls 20 to 22. Since the manufacturing accuracy of the outer peripheral circles of the balls 20 to 22 is generally high, the positional accuracy in the optical axis direction (Z direction) of the optical system of the X direction guide frame 3 is determined with high accuracy.

  In the present embodiment, the magnets 12b and 13b and the yokes 12d and 13d are attracted to each other in the optical axis direction by the magnetic force generated by the magnets 12b and 13b, and the base 1 and the X-direction guide frame 3 are attracted to each other. . Therefore, the balls 20 to 22 are sandwiched between the X-direction guide frame 3 and the base 1 by using the magnets 12b and 13b of the X-direction drive VCMs 12 and 13 that move the X-direction guide frame 3 in the X direction. Can do. Therefore, it is not necessary to newly provide special means for this clamping, and the number of components of the image blur correction device 106 can be reduced to reduce its cost. Further, since the balls 20 to 22 are sandwiched between the X-direction guide frame 3 and the base 1 by the magnetic force, the frictional resistance when the X-direction guide frame 3 moves can be reduced.

  Further, in the present embodiment, the X-direction guide frame 3 is stably supported with respect to the base 1 by the three balls 20 to 22 centering on the image sensor 11 and at two positions sandwiching the image sensor 11. Attracted to the base 1. For this reason, the image sensor 11 is stably held by the X-direction guide frame 3 without being inclined with respect to the base 1 in the optical axis direction (Z direction) of the optical system.

  In the above embodiment, the voice coil motor is used as the drive unit for moving the Y direction guide frame 2 and the X direction guide frame 3, but the present invention is not limited to this, and other actuators such as piezo elements are used. You may use as a drive part.

  In the above embodiment, one Y-direction driving VCM 5 and two X-direction driving VCMs 12 and 13 are used. However, the number of Y-direction driving VCMs and X-direction driving VCMs is three, It may be a plurality such as four.

  In the above embodiment, the case where three balls 7 to 9, 16 to 18, and 20 to 22 are used in each gap has been described. However, the number of balls is a plurality of four or five. May be.

  In the above embodiment, the magnets 12b and 13b and the yokes 12d and 13d provided on the base 1 are mutually connected in the optical axis direction by the magnetic force generated by the magnets 12b and 13b provided on the X-direction guide frame 3. The X-direction guide frame 3 was held on the base 1 by attracting. However, the magnets 12b and 13b may be provided on the base 1, and the yokes 12d and 13d may be provided on the X-direction guide frame 3. Further, instead of the magnets 12b and 13b and the yokes 12d and 13d, the X-direction guide frame 3 may be held on the base 1 using a spring that biases the X-direction guide frame 3 toward the base 1. Good.

  In the above embodiment, the case where the image blur correction device 106 according to the present invention is applied to the camera 100 has been described. However, the present invention can also be applied to other optical devices such as a video camera and a camera built in a mobile phone. It is. Even when the present invention is applied to such an optical apparatus, the same effects as the above-described embodiment can be obtained.

1 is a side view showing an outline of a configuration of a camera provided with an image shake correction apparatus according to an embodiment of the present invention. FIG. 2 is a rear view of the image blur correction device shown in FIG. 1 as viewed from the control device side in the optical axis direction. FIG. 3 is a cross-sectional view of the image shake correction apparatus shown in FIG. 2 taken along line III-III and viewed from the direction of the arrows. FIG. 4 is a cross-sectional view of the image blur correction device shown in FIG. 2 taken along line IV-IV and viewed from the direction of the arrows.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base 1a ... Storage part 2 ... Y direction guide frame (1st guide frame)
2a ... Opening 3 ... X direction guide frame (second guide frame)
4... First gap 5... VCM for Y direction driving (first driving means)
5a ... Yoke 5b ... Magnet 5c ... VCM coil 6 ... Plate spring (first elastic body)
7-9 Ball (first rolling element)
DESCRIPTION OF SYMBOLS 10 ... 2nd clearance 11 ... Image pick-up element 12, 13 ... VCM for X direction drive (2nd drive means)
12a, 13a ... yoke 12b, 13b ... magnet 12c, 13c ... VCM coil 12d, 13d ... yoke 14 ... X-direction position detecting element 14a ... yoke 14b ... magnet 14c ... Hall element 15 ... leaf spring (second elastic body)
16-18 Ball (second rolling element)
DESCRIPTION OF SYMBOLS 19 ... Y direction position detection element 19a ... Yoke 19b ... Magnet 19c ... Hall element 20-22 ... Ball (3rd rolling element)
23, 25, 26 ... FPC
DESCRIPTION OF SYMBOLS 24 ... Cover 100 ... Camera 101 ... Body 102 ... Lens barrel 103 ... Yawing detection gyro 104 ... Pitching detection gyro 105 ... Control device 106 ... Image blur correction device 107 ... Shooting lens group

Claims (5)

A base having a storage portion opened in a plane direction perpendicular to the optical axis of the optical system;
A surface perpendicular to the optical axis of the optical system, the outer periphery of which is arranged with a predetermined first gap from the inner periphery of the storage unit and is movable in a plane perpendicular to the optical axis of the optical system in the storage unit. A first guide frame having an opening that opens in a direction;
A first protrusion provided on an outer periphery of the first guide frame, protruding in a first direction substantially orthogonal to the optical axis and having a recess formed at a tip;
Is fixed to an inner periphery of the housing part, in the first direction, a first elastic member arcuate you biasing said first protrusion in a direction away from the inner circumferential surface of the receiving portion,
Between the recess of the first protrusion and the first elastic body, and between the outer periphery of the first guide frame and the inner periphery of the storage part on the side opposite to the side where the first protrusion is provided. And a first rolling element supported by
First driving means for moving the first guide frame in a second direction different from the first direction in a plane perpendicular to the optical axis ;
An image formed by the optical system, the outer periphery of which is arranged with a predetermined second gap from the inner periphery of the opening and is movable in a plane perpendicular to the optical axis of the optical system in the opening. A second guide frame for holding an image sensor to be imaged;
A second protrusion provided on an outer periphery of the second guide frame, protruding in the second direction and having a recess formed at a tip;
Is fixed to an inner periphery of the opening in the second direction, and the second elastic body arcuate you biasing the second protruding portion in a direction away from the inner circumferential surface of the opening,
Between the recess of the second protrusion and the second elastic body, and between the outer periphery of the second guide frame and the inner periphery of the opening opposite to the side where the second protrusion is provided. And a second rolling element supported by
An image blur correction apparatus comprising: a second driving unit that moves the second guide frame in the first direction. The image blur correction apparatus according to claim 1 , further comprising a third rolling element between the base in the optical axis direction of the optical system and the second guide frame. The second driving means includes a magnet provided on the second guide frame or the base and a coil provided on the base or the second guide frame so as to face the magnet.
The base or the second guide frame, the image blur correction apparatus according to claim 1 or 2, characterized in that it comprises a magnetic substance at a position facing to the magnet through the coil. The third rolling elements are provided at three locations between the base and the second guide frame around the imaging element held by the second guide frame,
The image blur correction device according to claim 3 , wherein the pair of the magnet and the magnetic body is provided at two symmetrical positions sandwiching the imaging element held by the second guide frame. And image blur correction apparatus as claimed in any one of claims 4, a shake detecting means for detecting the respective deflection in the first direction and the second direction, according to the detection output of the shake detecting means An optical apparatus comprising: correction control means for performing drive control of the first drive means and the second drive means to correct and control the position of the image sensor.