JP6372054B2 - LOCK MECHANISM AND OPTICAL DEVICE HAVING THE SAME - Google Patents

Description

  The present invention relates to an optical apparatus such as a lens barrel or a camera provided with a correction optical device for correcting image shake due to camera shake during shooting, and more particularly to a lock mechanism for holding a movable portion of the correction optical device fixedly. Is.

  In recent optical instruments such as a lens barrel and a camera, a correction optical device for correcting image blur caused by camera shake is performed. As one of the correction optical devices, a part of the lens optical system provided in the lens barrel is configured as a correction optical system to detect camera shake vibration generated in the lens barrel during photographing with the camera, and to detect the detected vibration. There is a configuration in which the correction optical system is driven eccentrically so as to cancel out the above. For this reason, the correction optical system is easily moved eccentrically in the lens barrel by an external force applied to the lens barrel, and the correction optical system comes into contact with or collides with the fixed portion of the lens barrel and is damaged by the eccentric movement. There is. In order to prevent such damage, a lock mechanism that holds the correction optical system fixedly to the fixed portion is provided. For example, in Patent Documents 1 and 2, an annular lock member that can be driven in the circumferential direction is provided on the lens barrel, and the eccentric movement of the correction optical system is allowed when the lock member is moved to the first circumferential position. However, a lock mechanism has been proposed in which when the correction is not performed, the lock member is moved to the second circumferential position, engaged with the correction optical system, and the eccentric movement is locked.

  In the lock mechanisms of Patent Documents 1 and 2, in order to hold the locked state and the unlocked state, it is necessary to hold the lock member in a stable state at the first and second rotational positions described above. . For this reason, in Patent Document 1, a plurality of lock sliders urged in the inner diameter direction by a lock spring are arranged at a plurality of circumferential locations along the outer periphery of the lock member, and the lock slider is provided on the outer peripheral edge of the lock member. The structure which latches rotation of a lock member by making it contact elastically is employ | adopted. Further, in Patent Document 2, a plate spring-like urging member provided at a plurality of locations around the circumference of the lock member is configured to be elastically engaged with a step portion provided in the correction optical system, and the lock member is rotated by this engagement. The structure which latches is employ | adopted.

JP 2009-169292 A JP 2012-47891 A

  In the lock mechanisms of the techniques of Patent Documents 1 and 2, a lock spring and a lock slide, which are separate from the lock member, or a plate spring-like urging member are provided to lock the rotation of the lock member. Therefore, the number of parts constituting the lock mechanism increases, and the assembly man-hours of the lock mechanism become complicated, resulting in obstacles to cost reduction of the correction device including the lock mechanism, the lens barrel, and the optical device. become. Further, since the lock spring and the urging member are manufactured as independent parts, the locking force when locking the rotation of the lock member is likely to vary due to manufacturing errors. In this type of locking mechanism, the lock member is driven to rotate by a small motor. However, if the locking force varies to the larger one, the rotational force required for the small motor increases. Thus, when the rotational force exceeds the driving capability of the small motor, the lock member cannot be rotated, and stable operation of the lock mechanism cannot be ensured. In other words, the locking operation and the unlocking operation may not be performed reliably. In particular, if the locking operation cannot be performed, moderation is not given to the movement of the correction optical system in the lens barrel, and the correction optical system is moved when an external force is applied to the fixed portion of the lens barrel. Collision or interference may cause damage to the correction optical system.

  An object of the present invention is to provide a lock mechanism that compensates for at least setting to a locked state while reducing the number of parts and reducing costs, and an optical device such as a lens barrel and a camera including the lock mechanism. It is to provide.

  The present invention is a lock mechanism capable of locking a correction moving body for performing image correction by moving relative to a fixed portion of an optical device such as a lens barrel or a camera with respect to the fixed portion. The lock mechanism is moved between at least two movement positions, allows the movement of the correction moving body at the first movement position, and locks the movement of the correction movement body at the second movement position; And a locking piece for holding the movement position of the lock member by engaging a part of the fixed portion when the member is moved to the two movement positions. It is formed integrally. Preferably, the lock member is configured as a lock ring rotated about an axis, and is configured to lock the correction moving body at an inner diameter edge thereof, and the locking piece is a part of the circumference of the outer diameter edge of the lock ring. The locking ring is configured as a locking spring piece that can be elastically deformed in the radial direction of the lock ring. It is set as the structure by which the contact member to latch is provided.

  In the contact member according to the present invention, at least a portion that contacts the locking piece is configured as an arc surface. The abutting member is configured to be detachable from the fixed portion, and is configured so that the relative position of the arc surface with respect to the locking piece can be changed. For example, the contact member is configured so that a plurality of columnar members having different diameters can be replaced and disposed. Alternatively, the contact member is formed of an eccentric cylindrical member whose mounting position in the rotational direction can be changed with respect to the fixed portion.

The locking piece in the present invention has a locking claw portion that comes into contact with the arc surface of the abutting member, and this locking claw portion is formed on the arc surface when the locking piece moves between two movement positions. The corners of the abutting end are formed in an arc shape. The locking pawl portions are each arcuate surface when moving in the opposite directions between two moving position and the radius of curvature of each corner of the end portions of the abutting circumferential direction is different, the locking claw portion The radius of curvature of the corner that comes into contact when moving from the first movement position to the second movement position is the corner that comes into contact when moving from the second movement position to the first movement position. Is larger than the radius of curvature. The locking piece has a base end portion with one circumferential end connected to the lock ring, and extends from the base end in the circumferential direction of the lock ring with a required length, and is locked to the tip end portion. It is preferable that a claw portion is provided and that the corner portion on the distal end side and the corner portion on the proximal end side of the locking claw portion are formed in an arc shape.

  The optical apparatus of the present invention is configured as an optical apparatus such as a lens barrel or a camera provided with the above-described lock mechanism of the present invention.

  According to the present invention, the correction movable body is locked and locked by the lock member, while the lock is released to enable correction by the correction movable body. The lock member is held in the locked position and the unlocked position by engaging a locking piece provided integrally with the fixed portion. By forming the locking piece integrally with the lock member, the number of parts can be reduced and the cost of the lock mechanism can be reduced.

  In addition, by configuring the locking piece as a locking spring piece, it becomes easy to engage with the abutting member provided in the fixed portion, and the lock member is stably in the locked position and the unlocked position. Can hold.

  According to the present invention, since the abutting member has the arc surface abutted on the locking piece and holds the lock member at the lock position and the unlocking position, the lock is achieved by changing the relative position of the arc surface with respect to the locking piece. The driving force during the movement of the member can be appropriately adjusted, and the lock member can be stably held at the lock position and the lock release position.

  According to the present invention, the corner portion of the latching claw portion provided on the latching piece has an arc shape, and the curvature radius of the corner portion along the direction in which the lock member moves is made different. The driving force when moving from the locking position to the locking position can be made smaller than the driving force when moving from the locking position to the unlocking position, and the correction moving body can be reliably locked by the lock member. Can be reliably prevented from being damaged by external force or the like without being locked.

The conceptual block diagram of the camera provided with the correction | amendment optical apparatus containing the locking mechanism of this invention. The external appearance perspective view of the whole structure of a correction | amendment optical apparatus. The partial exploded perspective view of a correction | amendment optical apparatus. The front view of a correction lens frame. Sectional drawing in a post. Sectional drawing of a ball retainer. The partially broken perspective view and bb line expanded sectional view of a magnetic actuator. The front view and schematic diagram for demonstrating position control of a correction | amendment lens frame. The disassembled perspective view of a part of correction | amendment optical apparatus for XY guide part explaining. Sectional drawing of a position sensor, and the characteristic view explaining detection operation. The rear view for demonstrating operation | movement of a locking mechanism. The expansion perspective view of the principal part of a lock mechanism. The enlarged rear view of the latching claw part of a latching spring piece. The cc line expanded sectional view of FIG. The perspective view of the modification of a locking pin. The rear view of the principal part of the state which the latching claw part contact | abutted to the contact part at the time of switching from a lock release state to a lock state. The rear view of the principal part of the state which the latching claw part contact | abutted to the contact part at the time of switching from a locked state to a lock release state. The rear view of the principal part in the state where the latching spring piece buckled.

  Next, embodiments of the present invention will be described with reference to the drawings. In this embodiment, the locking mechanism according to the present invention is configured as a locking mechanism for locking (locking) the correction optical device for hand touch correction provided on the lens barrel of the camera with respect to the lens barrel. . FIG. 1 is a conceptual configuration diagram of the camera CAM. A camera body CB and a camera lens CL (hereinafter referred to as a lens barrel) CL that is formed integrally with the camera body CB or detachable from the camera body CB. In the camera body CB, an image sensor IS for capturing a subject image formed by the lens barrel CL is housed. The lens barrel CL is internally provided with an image forming optical system OL for forming an image of the subject, and a correction optical device ROD for correcting a camera shake of an object image formed by the image forming optical system OL. Has been. This correction optical device ROD is built in the lens barrel CL and is based on detection signals from vibration detection means (gyro sensors) XG and YG that detect camera shake vibration generated in the camera body CB or the lens barrel CL during photographing. The subject image is displaced in the X direction (left-right direction in FIG. 1) and Y direction (up-down direction in FIG. 1) orthogonal to the optical axis so as to cancel the vibration. In order to perform this correction, the correction optical device ROD includes a correction lens RL disposed on the optical path of the imaging optical system OL, and X, X, Y for driving the correction lens RL in the X and Y directions. Magnetic actuators XM and YM having Y voice coil configurations and X and Y position sensors XS and YS for detecting positions in the X and Y directions associated with driving of the correction lens RL are provided.

  FIG. 2 is an external perspective view of the correction optical device ROD, that is, the camera shake correction device as seen from the camera body side. The camera shake correction device ROD is assembled mainly with a fixed frame 1 having a shape close to a short cylinder, and the fixed frame 1 is fixedly supported in the lens barrel CL of FIG. FIG. 3 is a partially exploded perspective view of the camera shake correction apparatus ROD, as viewed from the front side of the lens barrel CL, that is, from the subject side. In the following description, the front side is the subject side and the rear side is the camera body side. 2 and 3 together, a rear yoke 2, a front yoke 3, and a base plate 4 are fixedly supported on the front side of the fixed frame 1 in a state of being arranged in the optical axis direction. A correction lens frame 5 that supports the correction lens RL is disposed between the rear yoke 2 and the front yoke 3 in the optical axis direction. The correction lens frame 5 corresponds to a correction moving body in the present invention, and is supported so as to be movable in the X direction and the Y direction with respect to the fixed frame 1. On the other hand, on the rear side of the fixed frame 1, that is, the surface on the camera body side, a lock ring 6 constituting a part of the lock mechanism in the present invention is supported so as to be rotatable at a required angle in the circumferential direction.

  The fixed frame 1 is formed in a short cylindrical container shape in which a part of a circumferential wall is notched and opened in the center, and the upper part of the front surface that is the bottom surface in the cylinder when the fixed frame 1 is viewed from the subject side. A rear ball retainer 8A, which will be described in detail later, is disposed at three locations, the lower right portion and the lower left portion (hereinafter, the directions seen from the front side in the left, right, and upper and lower directions). Further, a lock motor 10 whose details will be described later is mounted on the fixed frame 1, and a Y guide portion 11 whose details will also be described later is integrally formed. The lock ring 6 and the lock mechanism of the present invention including the lock ring 6 are disposed on the back surface of the fixed frame 1, that is, on the camera body side, and details thereof will be described later.

  As shown in FIG. 4, a front view of the correction lens frame 5 mounted in the fixed frame 1 is formed of a resin formed in a substantially annular shape in which the correction lens RL is fitted and supported in a central circular opening. The frame portion 51 and a support plate portion 52 made of metal such as aluminum having a substantially annular plate shape, which are integrally attached to the front surface of the frame portion 51 along the circumference. As described above, the correction lens RL moves in the X direction and the Y direction to correct image blur of the subject image. An X drive coil 53x is fixed to the right side of the support plate 52 of the correction lens frame 5 along the circumference, and a Y drive coil 53y is fixed to the lower side. Each of the X drive coil 53x and the drive coil 53y has a configuration in which a thin conducting wire is wound so as to have an oval shape having a long axis in the circumferential tangent direction. That is, the X drive coil 53x has a long axis in the Y direction, the Y drive coil 53y has a long axis in the X direction, and each drive coil 53x, 53y penetrates the correction lens frame 5 in the plate thickness direction. And is exposed on both sides in the optical axis direction. A small X position detection magnet 54x is supported on the left side of the frame 51 of the correction lens frame 5, and a small Y position detection magnet 54y is similarly supported on the upper side. Furthermore, a rectangular insertion hole 55 having a small opening size is penetrated in the upper right part and the lower left part of the correction lens frame 5 in the thickness direction. An X guide portion 56 that does not appear in FIGS. 2 to 4 is integrally formed on the back surface of the correction lens frame 5, which will be described later.

  In FIG. 3, the rear yoke 2 is formed of a substantially semi-circular metal plate having a semicircular arc shape extending from the upper right to the lower left when viewed from the front direction, for example, an iron plate, and the right side of the front surface thereof. The rear X magnet 21x is fixed to the area, and the rear Y magnet 21y is fixed to the lower area. Further, post 22 having a required length projecting in the front direction along the optical axis direction is erected on the upper right portion and the lower left portion of the front surface of yoke 2. Although the post 22 will be described later with reference to FIG. 5, a small diameter portion 22 a is provided at each of the longitudinal front and rear ends and the middle, and the rear end portion of the post 22 is fixed to the rear yoke 2 by caulking Yes. The front yoke 3 is also formed in substantially the same shape as the rear yoke 2, and similarly to the rear yoke 2, the front X magnet 31x is fixed to the right area on the front surface, and the front Y magnet 31y is fixed to the lower area. . Further, support holes 32 are formed in the upper right end portion and the lower left end portion of the front yoke 3 so that the front ends of the posts 22 provided in the rear yoke 2 can be fitted. These front and rear yokes 2, 3 increase the magnetic flux density of the magnets 21x, 21y, 31x, 31y, respectively.

  The base plate 4 is formed in an annular plate shape, and similar support holes 41 are formed at the same positions as the support holes 32 of the front yoke 3, and at three locations on the upper, lower right, and lower portions of the base plate 4. A front ball retainer 8B, which will be described in detail later, is supported. In addition, Hall element tables 9x and 9y are supported on the upper and left portions of the base plate 4, respectively. These Hall element bases 9x and 9y are attached to the base plate 4 by support arms 91 provided at the respective front ends, and the Hall element bases 9x on the base plate 4 are adjusted by adjusting the mounting positions of the support arms 91. 9y can be finely adjusted. Further, a flexible substrate 7 is attached to the rear surface of the region extending from the upper part to the left part of the base plate 4. The flexible substrate 7 has element substrates 72x and 72y on which the Hall elements 71x and 71y are mounted on the rear surface. When the flexible substrate 7 is attached to the base plate 4, the two Hall elements 71x and 71y are respectively connected to the Hall element bases 9x and 9x. It is supported by the end surface directed to the rear side of 9y.

  The rear yoke 2, the correction lens frame 5, the front yoke 3, and the base plate 4 are assembled on the front surface of the fixed frame 1 in a state where they are stacked in this order in the optical axis direction. FIG. 5 is an enlarged cross-sectional view along the longitudinal direction of the post 22 in an assembled state. The rear yoke 2 is disposed along the front surface of the fixed frame 1, and the rear end 22 b of the post 22 protruding from the rear surface side of the rear yoke 2 is inserted into a hole provided in the fixed frame 1, thereby fixing the fixed frame. 1 is connected and positioned. Next, the correction lens frame 5 is disposed from the front side, and the insertion hole 55 of the correction lens frame 5 is inserted into the post 22. The correction lens frame 5 is positioned with respect to the rear yoke 2 and the fixed frame 1 by inserting the post 22 into the insertion hole 55. However, since the opening size of the insertion hole 55 is larger than the diameter size of the small diameter portion 22a of the post 22, the correction lens frame 5 is relatively small with respect to the rear yoke 2 and the fixed frame 1 at a minute distance in the X direction and the Y direction. Movement is possible. Further, the front yoke 3 is disposed on the front side of the correction lens frame 5. When the support hole 32 provided in the front yoke 3 is fitted into the front end 22 c of the post 22, the front yoke 3 is positioned with respect to the rear yoke 2 and the fixed frame 1 and is integrated with the rear yoke 2. It will be. Similarly, when the base plate 4 is disposed on the front surface side of the front yoke 3, the base plate 4 is positioned with respect to the front yoke 3 by fitting the support hole 41 of the base plate 4 to the front end 22 c of the post 22. At the same time, it is integrated with the front yoke 3. Also, the flexible substrate 7 attached to the base plate 4 shown in FIG. 3 has two electrodes 73 extending on both sides of the X and Y drive coils 53x and 53y respectively mounted on the correction lens frame 5. Connected to the electrode and electrically connected.

  When the rear yoke 2, the correction lens frame 5, the front yoke 3 and the base plate 4 are assembled in this way, the correction lens frame 5 is provided on the rear ball retainer 8 </ b> A provided on the fixed frame 1 and the base plate 4. The front ball retainer 8B is sandwiched in the optical axis direction at three locations around the circumference, and the correction lens frame 5 is positioned in the optical axis direction. As shown in a sectional view along the longitudinal direction of the ball retainers 8A and 8B in FIG. 6, here, the support plate portion 52 of the correction lens frame 5 is sandwiched between the ball retainers 8A and 8B in the optical axis direction. Thereafter, each of the previous ball retainers 8A and 8B has substantially the same configuration, and a cylindrical retainer 81, and a set screw 82 that is inserted into the retainer 81 and screwed into the inner surface of the retainer 81 with a screw 84. The ball 83 is in contact with and supported by the front end surface of the set screw 82. The ball 83 is configured so as not to drop out of the retainer 81 although it does not appear in the drawing. The retainer 81 of the rear ball retainer 8A is caulked and fixed in the hole opened in the fixed frame 1 and is integrally supported by the fixed frame 1. The retainer 81 of the front ball retainer 8B is caulked in the hole opened in the base plate 4. It is fixed and supported integrally with the base plate 4.

  With this configuration, the correction lens frame 5 is supported while being sandwiched in the optical axis direction by the balls 83 of the rear ball retainer 8A and the front ball retainer 8B. With this support, the optical axis of the correction lens frame 5 is supported. Directional positioning is performed. Here, in the rear ball retainer 8A, a thin plate-like spacer (shim) 85 is inserted between the proximal end portion of the retainer 81 and the proximal end portion of the set screw 82, and the distal end position of the ball 83 is finely adjusted. . Further, in the front ball retainer 8B, a compression coil spring 86 is inserted between the proximal end portion of the retainer 81 and the proximal end portion of the set screw 82, and urges the set screw 82 in the proximal direction (left direction in the figure). Thus, backlash in the set screw 82 is absorbed, and the position of the ball 83 in the optical axis direction is held. As a result, the correction lens frame 5 is supported in a state where a small gap in the optical axis direction is formed between the balls 83 of the both ball retainers 8A and 8B. While maintaining a vertically oriented posture, it is possible to smoothly move between the balls 83 in a direction substantially perpendicular to the optical axis direction.

  Further, by assembling in this way, the rear X magnet 21x and the front X magnet 31x are disposed to face each other in the optical axis direction, and an X drive coil 53x is disposed between the magnets 21x and 31x, thereby the X magnetism. An actuator XM is configured. Similarly, the Y magnetic actuator YM is composed of the rear Y magnet 21y, the front Y magnet 31y, and the Y drive coil 53y. 7A and 7B are a perspective view in which a part of the front X magnet 31x of the X magnetic actuator XM is broken, and an enlarged cross-sectional view taken along the line bb in FIG. 7A. Thereafter, the front X magnets 21x and 31x are constituted by end face dipole magnets in which the S pole and the N pole are magnetized adjacent to each other without providing a neutral area (a non-magnetized area). The S poles and N poles of the magnets 21x and 31x are opposed to each other. Therefore, a magnetic circuit is formed between the magnets 21x and 31x along the facing direction. By passing a current through the X drive coil 53x disposed in the magnetic circuit, the X drive coil 53x has an X A driving force F in the direction is generated, and the correction lens frame 5 is moved in the X direction. Although not shown, the same applies to the Y magnetic actuator YM, and the correction lens frame 5 can be moved in the Y direction by energization control to the Y drive coil 53y.

  In the X magnetic actuator XM having this configuration, the magnets 21x and 31x have a configuration in which a neutral region does not exist between the S pole and the N pole. Therefore, the driving direction shown in FIG. The dimensions of the magnets 21x and 31x in the direction of the force F can be reduced. Further, the drive efficiency change when the drive coil 53x is driven near the center of the magnets 21x and 31x is reduced. On the other hand, with the movement of the drive coil 53x, the drive coil 53x straddles the magnetic pole, and a reverse magnetic field is applied to the drive coil 53x, which may reduce the driving force. However, since the magnetic circuit is configured by arranging the two magnets 21x and 31x oppositely across the drive coil 53x, the magnetic flux density can be increased and the driving force can be improved. That is, by using a magnet with end face dipole magnets for the magnets 21x and 31x and a configuration in which the drive coil 53x is sandwiched between these magnets, the X magnetic actuator XM is reduced in size and the driving force is increased. Thus, the correction lens frame 5 can be driven quickly and at high speed. The same applies to the Y magnetic actuator YM.

  In addition, in this embodiment, the front yoke 3 is coupled to the rear yoke 2 using the post 22 erected on the rear yoke 2, so that the front X and Y magnets 21x and 21y have front X, The Y magnets 31x and 31y can be positioned with high accuracy. As a result, even when the magnets 21x, 21y, 31x, 31y employ a magnet that does not have a neutral region as described above, the S poles and N poles of the opposed magnets 21x, 31x, 21y, 31y are high. They can be arranged opposite to each other with positional accuracy, and the magnetic flux density of a magnetic circuit constituted by both magnets can be set to a high density. Further, the change in the magnetic flux density distribution due to the positional deviation between the magnets 21x and 31x, 21y and 31x is reduced, and an equal driving force can be obtained. Further, since the correction lens frame 5 is held at a substantially intermediate position between the rear yoke 2 and the front yoke 3 in the optical axis direction by the ball retainers 8A and 8B, the drive coils 53x and 53y mounted on the correction lens frame 5 are used. Is driven at an intermediate position between the opposing rear magnets 21x and 21y and the front magnets 31x and 31y, that is, in a region where the magnetic flux densities of the magnetic circuits formed by the opposing magnets 21x and 31x and 21y and 31x are uniform. Therefore, stable and highly accurate driving with high driving force is possible.

  In this embodiment, since the post 22 connecting the rear yoke 2 and the front yoke 3 is inserted into the insertion hole 55 opened in the correction lens frame 5, the insertion hole 55 and the post 22 are used. It is also possible to position and restrict the correction lens frame 5. FIG. 8A is a cross-sectional view in a direction perpendicular to the optical axis showing the relationship between the insertion hole 55 of the correction lens frame 5 and the post 22, and the insertion hole 55 is formed of the small diameter portion 22 a of the post 22 having a circular cross section. It is formed in a rectangular hole having an opening size larger than the diameter size. The opening dimension of the insertion hole 55 in the X direction and the Y direction is twice the dimension obtained by adding the radius r of the small diameter portion 22a to the movement dimensions x1, y1 in the X direction and Y direction required for the correction lens frame 5. is there. That is, the opening dimension in the X direction is 2 (x1 + r), and the opening dimension in the Y direction is 2 (y1 + r). Accordingly, the reference position of the correction lens frame 5 can be set by setting the center of the small-diameter portion 22a of the post 22 to the center of the insertion hole 55, and when the X and Y magnetic actuators XM and YM are driven, FIG. As shown in FIG. 8 (b), the correction lens frame 5 is allowed to move in the range of ± x1 and ± y1, while further movement is restricted. These x1 and y1 are normally designed as x1 = y1, but the design can be changed as appropriate.

  In this embodiment, the two posts 22 for connecting the rear yoke 2 and the front yoke 3 each having a substantially semicircular arc shape are disposed at both ends of the semicircular arcs of the yokes 2 and 3, respectively. When the front yoke 3 is assembled to the rear yoke 2 by the magnetic force between the rear magnets 21x and 21y provided on the yokes 2 and 3 and the front magnets 31x and 31y, or when the front yoke 3 is removed from the rear yoke 2, A situation in which 3 is attracted by magnetic force tends to occur. In particular, since a neodymium magnet has a very strong adsorption force, such a phenomenon is likely to occur. However, in this configuration, the principle of the lever is small by assembling and removing both the yokes 2 and 3 while rotating the front yoke 3 in the plate thickness direction with the line connecting the two posts 22 as a fulcrum. There is also an advantage that the assembly and removal can be performed with an operating force.

  The correction lens frame 5 is restricted from moving in the X and Y directions by a Y guide portion 11 provided on the fixed frame 1 and an X guide portion 56 provided on the correction lens frame 5. As shown in an exploded perspective view in FIG. 9, a thin rod-shaped guide 12 is disposed between the front surface of the fixed frame 1 and the rear surface of the correction lens frame 5. The guide 12 is formed in an inverted L shape having an X side portion 12x extending in the left-right direction and a Y side portion 12y extending downward from the left end of the X side portion 12x. On the other hand, the Y guide portion 11 provided on the left side of the front surface of the fixed frame 1 is configured to sandwich the Y side portion 12y of the guide 12 in a loose state from the left and right at two locations arranged in the vertical direction. Yes. Further, the X guide portion 56 provided on the upper side of the rear surface of the correction lens frame 5 is configured to hold the X side portion 12x of the guide 12 in a loose state from above and below at two locations arranged in the left-right direction. ing.

  With this configuration, when the correction lens frame 5 is moved in the X direction by the X magnetic actuator XM, the X guide portion 56 of the correction lens frame 5 remains in the state where the X side portion 12x of the guide 12 is sandwiched. It is moved in the X direction along the part 12x. Further, when the correction lens frame 5 is moved in the Y direction by the Y magnetic actuator YM, the X guide portion 56 moves the guide 12 integrally while sandwiching the X side portion 12x of the guide 12, and the guide 12 The Y side portion 12y is moved in the Y direction while being sandwiched between the Y guide portions 11 of the fixed frame 1. As a result, the movement of the correction lens frame 5 by the X magnetic actuator XM can be restricted in the X direction, and the movement of the correction lens frame 5 by the Y magnetic actuator YM can be restricted in the Y direction, and correction can be performed by the magnetic actuators XM and YM. The lens frame 5 can be accurately and smoothly moved in the X direction and the Y direction, and camera shake correction can be performed quickly.

  On the other hand, in order to detect the movement position of the correction lens frame 5 in the X and Y directions, the X position detection magnet 54x is supported on the left side of the correction lens frame 5 as described above, and the Y position is positioned on the upper side. A detection magnet 54 y is supported, and two Hall elements 71 x and 71 y are mounted on the base plate 4 on the Hall element bases 9 x and 9 y by the flexible substrate 7 so as to oppose the X and Y position detection magnets 54 x and 54 y. ing. The X position detection magnet 54x and the Hall element 71x constitute the X position sensor XS, and the Y position detection magnet 54y and the Hall element 71y constitute the Y position sensor YS. FIG. 10A is a cross-sectional view of the position sensor XS. The X position detection magnet 54x is spaced apart in the X direction via a spacer 54i made of a nonmagnetic material, and is composed of a pair of magnets 54s and 54n in which the S pole and the N pole are directed on the same plane with respect to the Hall element 71x. Is done. The pair of magnets 54s and 54n and the spacer 54i are inserted and supported in a rectangular window frame 57 provided in the frame portion 51 of the correction lens frame 5. The Hall element 71x is mounted and supported on the Hall element base 9x of the base plate 4 so as to face the X position detection magnet 54x at a position facing the spacer 54i, more precisely at an intermediate position in the X direction between the pair of magnets 54s and 54n. ing. The Y position sensor YS has the same configuration.

  In the X position sensor XS, when the correction lens frame 5 moves in the X direction, the magnetic field formed by the X position detection magnet 54x is also moved simultaneously, and the magnetic flux density with respect to the Hall element 71x changes. FIG. 10B is a schematic diagram showing a change in magnetic flux density with respect to the Hall element 71x. The X position sensor XS can detect the movement position of the X position detection magnet 54x, that is, the position of the correction lens frame 5 in the X direction by detecting the change in the output current of the Hall element 71x accompanying the change in the magnetic flux density. it can. When detecting this position, a pair of magnets 54s and 54n are arranged via the spacer 54i to form a neutral region between the magnets 54s and 54n, so that a linear region is ensured in the magnetic flux density characteristics. This enables accurate and highly accurate position detection. Similarly, the Y position sensor YS can detect the position in the Y direction.

  In the camera shake correction apparatus ROD described above, when camera shake occurs during shooting with the camera CAM, the vibration detection means XG and YG detect camera shake vibration. Although description is omitted, the lens CPU mounted on the lens barrel CL performs a required calculation based on the camera shake vibration, and the calculated drive current is supplied to the X drive coil 53x and the Y drive coil via the flexible substrate 7. To 53y. As a result, the X and Y magnetic actuators XM and YM are driven, and the correction lens frame 5 is moved in the X and Y directions to cancel out the camera shake vibration and execute the camera shake correction. At this time, the amount of movement of the correction lens frame 5 in the X and Y directions is detected by the X and Y position sensors XS and YS, and the magnetic actuators XM and YM are feedback-controlled so that the correction lens frame 5 has a target position. Control to correct the camera shake by moving accurately.

  In these magnetic actuators XM and YM, the rear yoke 2 and the front yoke 3 are coupled by a post 22, so that the magnets XM and YM are respectively constituted by the post 22. 21x and 31x, 21y and 31y can be easily positioned and assembled with high accuracy, and the magnetic flux density of the magnetic circuit constituted by both magnets is high with the magnetic poles of both magnets facing each other with high accuracy. Can be set to Therefore, as described above, even when the magnets 21x, 31x, 21y, 31y employ a magnet that does not have a neutral region, a magnetic actuator that exhibits a high driving force can be realized, and a magnet that does not have a neutral region. As a result, the dimensions of the magnetic actuators XM and YM in the X and Y directions can be reduced, the diameter of the correction lens frame 5 can be reduced, and the camera shake correction device ROD can be downsized.

  Further, since the post 22 connecting the rear yoke 2 and the front yoke 3 is inserted into the insertion hole 55 opened in the correction lens frame 5, the correction lens frame 5 is connected to the rear yoke by the insertion hole 55 and the post 22. 2 and the front yoke 3 can be positioned, and the drive coils 21x and 31x, 21y and 31y in the magnetic actuators XM and YM can be positioned. Therefore, a larger driving force can be obtained when the driving coil is driven in each of the magnetic actuators XM and YM, and at the same time, the movement range of the correction lens frame 5 is limited by the engagement between the insertion hole 55 and the post 22. It is also possible to perform position control. Therefore, an independent configuration for positioning and position regulation of the correction lens frame 5 is not necessary, which is advantageous for downsizing the camera shake correction device.

  Further, since the post 22 is connected to the base plate 4, the correction lens frame 5 can be positioned with respect to the base plate 4 by inserting the post 22 into the insertion hole 55 of the correction lens frame 5, and the position sensor XS. , YS makes it easy to position the position detection magnets 54x and 54y with respect to the Hall elements 71x and 71y. That is, the position detection magnets 54x and 54y can be roughly positioned with respect to the hall elements 71x and 71y by the post 22, and the subsequent high-precision positioning using the support arm 91 can be facilitated. As a result, the Hall elements 71x and 71y can be accurately positioned in a region where the change in magnetic flux density formed by the position detection magnets 54x and 54y is in a proportional relationship, and highly accurate position detection by the position sensors XS and YS is possible. become.

  As shown in FIG. 2, the lock ring 6 described above is disposed and supported as a lock member constituting a part of the lock mechanism of the present invention at the rear surface position of the fixed frame 1 of the lens barrel CL having such a configuration. Has been. As shown in FIGS. 11A and 11B when the lens barrel CL is viewed from the rear surface side, a region excluding the peripheral edge of the rear surface of the fixed frame 1 is recessed in the lens optical axis direction. A lock ring 6 formed in the shape of an annular plate is disposed in the recessed region. The lock ring 6 is disposed so as to surround an annular rib 57 formed on the rear surface of the correction lens frame 5, and screws 1 a disposed at a plurality of circumferential positions on the peripheral edge of the fixed frame 1. And the washer 1b are supported so that they can be rotated around the optical axis of the lens in a state in which they are prevented from falling off in the rear surface direction. A gear 61 meshed with a pinion 10a of the motor 10 (shown by a broken line in the figure) supported by the fixed frame 1 is provided on a part of the circumference of the lock ring 6. Due to the rotational force, the lock ring 6 is small in the clockwise and counterclockwise directions of FIGS. 11A and 11B (hereinafter, the clockwise and counterclockwise directions are based on FIGS. 11A and 11B). It is designed to reciprocate within a range of angles. On the inner peripheral edge of the lock ring 6, cam concave portions 62 are formed in which four circumferential positions are recessed in the outer diameter direction. This cam concave portion 62 is a peripheral surface of the annular rib 57 of the correction lens frame 5. Are opposed to each other in the radial direction by four protrusions 58 provided in the outer diameter direction and projecting in the outer radial direction. Further, a photo interrupter 13 for detecting the rotational position of the lock ring 6 is disposed on a part of the circumference of the fixed frame 1.

  As shown in FIG. 11A, when the lock ring 6 is rotated to the unlocking position in the counterclockwise direction by the motor 10, the cam recess 62 is in a position facing the protrusion 58 of the annular rib 57. The protrusion 58 is not in contact with the inner peripheral edge of the lock ring 6. Therefore, the projection 58 can move within the region of the cam recess 62, and the correction lens frame 5 can be moved in the X direction and Y direction within the range of this region. That is, a camera shake correction operation is possible. On the other hand, as shown in FIG. 11B, when the lock ring 6 is rotated clockwise by the motor 10 to the lock position, the cam recess 62 is disengaged from the position facing the protrusion 58 and is locked. The inner peripheral edge of 6 is in contact with the protrusion 58. As a result, the movement of the correction lens frame 5 in the X direction and the Y direction is restricted, and the correction lens RL is locked at the optical axis position of the lens barrel CL. The rotation position of the lock ring 6 is detected by the photo interrupter 13, and the motor 10 is feedback controlled by this detection output, so that the lock release position and the rotation position to the lock position can be set.

  The lock ring 6 is made of a material having some elasticity such as resin or metal, and a part of the circumference of the outer circumference (the left part in FIGS. 11A and 11B) has the outer circumference. A locking spring piece 63 having a required length substantially in the shape of a circular arc is integrally formed. FIG. 12 is an enlarged perspective view of a main part including the locking spring piece 63. The locking spring piece 63 has a counterclockwise end connected to the lock ring 6 as a base end 63a, and is clockwise. The side end portion is configured as a cantilever piece having a free end portion 63b. Further, by forming a minute gap between the lock ring 6 and the inner diameter edge of the locking spring piece 63, the locking spring piece 63 is elastically deformed in the radial direction in the free end 63b within the gap area. It is possible. Further, a locking claw portion 64 is formed integrally with the free end 63 b of the locking spring piece 63.

  As shown in the enlarged rear view of FIG. 13, the locking claw portion 64 is formed by expanding the width dimension of the locking spring piece 63, that is, the dimension directed in the radial direction of the lock ring 6 in the outer radial direction. The corner 64a on the distal end side (clockwise direction) and the corner 64b on the base end side (counterclockwise side) of the outer diameter edge of the locking claw portion 64 are each formed in an arc shape. In addition, the radius of curvature r1 of the corner 64a on the distal end side is made larger than the radius of curvature r2 of the corner 64b on the proximal end. In other words, the center position c1 of the arc of the corner 64a on the distal end side has a shape positioned closer to the inner diameter side of the lock ring 6 than the arc center position c2 of the corner 64b on the proximal end side.

  On the other hand, an inner edge portion of the fixed frame 1 is provided in a partial circumferential region of the fixed frame 1, that is, a region in which the locking claw portion 64 of the locking spring piece 63 rotates as the lock ring 6 rotates. An arc groove 15 is formed that is recessed in the outer diameter direction over a required length, and when the lock ring 6 is rotated, the locking claw 64 is rotated in the arc groove 15. . In addition, a cylindrical locking pin 14 is press-fitted and supported in the direction of the lens optical axis as a contact member of the present invention at a position slightly offset in the clockwise direction from the circumferential center position of the circular arc groove portion 15. ing. As shown in FIG. 14, which is an enlarged sectional view taken along the line cc of FIG. 12, the locking pin 14 includes a cylindrical abutting portion 14 a having a required diameter and a press-fit having a cylindrical shape smaller than that. A portion 14b is integrally formed side by side in the pin axis direction, and the press-fit portion 14b is press-fitted in the lens optical axis direction into a hole 1c provided in the fixed frame 1 and supported by the fixed frame 1. In this locking pin 14, a part of the circumference of the abutting portion 14 a protrudes to the inner diameter side from the bottom surface (edge portion on the outer diameter side) of the arc groove portion 15, and the locking spring piece 63 is locked by the lock ring 6. When rotated in the circumferential direction, the edge on the outer diameter side of the locking claw 64 is brought into contact with or in contact with the peripheral surface of the contact portion 14a. Further, the contact portion 14a of the locking pin 14 is formed to have a radius dimension larger than the curvature radii r1 and r2 of each corner portion of the locking claw portion 64, here, about 2 to 3 times.

  The lock ring 6, the lock spring piece 63, and the lock pin 14 constitute the lock mechanism of the present invention. According to this lock mechanism, the motor 10 is rotated in the clockwise direction so that the lock ring 6 is counteracted. When rotated clockwise, as shown in FIG. 11A, the cam recess 62 of the lock ring 6 is positioned to face the protrusion 58 of the annular rib 57 of the correction lens frame 5, and the protrusion 58 is locked to the lock ring 6. Since the projection 58 can move within the region of the cam recess 62, the correction lens frame 5 is unlocked so that it can move in the X and Y directions within the region. It becomes. At this time, as the locking ring 6 rotates, the locking spring piece 63 has a locking claw portion 64 whose circumferential surface of the contact portion 14a of the locking pin 14 (hereinafter referred to as the circumferential surface of the locking pin 14). It may be elastically deformed in the inner diameter direction by striking it and may move over the locking pin 14 to a counterclockwise position. In this state, as shown in the enlarged rear view of FIG. 16, the corner 64a on the distal end side of the locking claw 64 is brought into contact with the circumferential surface of the locking pin 14, so that friction caused by this contact is generated. It is locked that the locking claw 64, that is, the locking spring piece 63 is rotated clockwise by the force. Therefore, even if the lock ring 6 is about to be rotated by an external force applied to the lens barrel CL, the lock ring 6 is prevented from rotating counterclockwise, and the unlocked state is maintained. Become. In addition, since the arc-shaped groove portion 15 is longer in the counterclockwise direction than the locking pin 14, that is, the circumferential length of the region on the unlocking side is longer than that on the locking side, the locking spring piece 63 is in the unlocked state. The degree of freedom of movement in the circumferential direction is high, and the unlocked state is maintained even when the lock ring 6 is slightly rotated unintentionally. For example, even if the lock ring 6 is slightly rotated due to camera shake at the time of shooting, the unlocking state of the correction lens frame 5 is maintained and the camera shake correction operation is ensured.

  On the other hand, when the motor 10 is rotated counterclockwise from the unlocked state and the lock ring 6 is rotated clockwise, the cam recess 62 of the lock ring 6 is in contact with the protrusion 58 as shown in FIG. The inner peripheral edge of the lock ring 6 comes into contact with the protrusion 58. As a result, the correction lens frame 5 is in a locked state in which movement in the X and Y directions is restricted and the correction lens RL is constrained to the lens optical axis position. At this time, as the lock ring 6 rotates, the locking claw 64 of the locking spring piece 63 comes into contact with the circumferential surface of the locking pin 14 and is elastically deformed in the inner diameter direction. It is moved to the clockwise position. In this state, as shown in the enlarged rear view of FIG. 17, the corner 64b on the proximal end side of the locking claw 64 is brought into contact with the circumferential surface of the locking pin 14, so that the locking claw 64 That is, it is locked that the locking spring piece 63 rotates counterclockwise, and the locked state is maintained. Since the length of the arcuate groove 15 on the lock state side is short, there is almost no freedom of movement of the locking spring piece 63 in the circumferential direction, the lock ring 6 can be held in a stable state, and the correction lens frame 5 Is prevented from moving unintentionally.

  As shown in FIG. 16, when the locking claw portion 64 is in contact with the circumferential surface of the locking pin 14 and is held in the unlocked state, as shown in FIG. 64 end side corners 64 a, that is, corners formed in an arc shape with a large curvature radius are in contact with the circumferential surface of the locking pin 14. On the other hand, in the case of FIG. 11 (b) held in the locked state, as shown in FIG. 17, the base end side corner 64b of the locking claw 64, that is, a corner formed in an arc shape with a small curvature radius. The portion is in contact with the circumferential surface of the locking pin 14. Therefore, the locking claw 64 is moved over the locking pin 14 by the frictional force generated by the contact between the locking claw 64 and the circumferential surface of the locking pin 14, and the lock ring 6 integrated therewith is rotated. In order to rotate, a rotational force that overcomes the frictional force is required, and unless the rotational force is applied, the lock mechanism 6 is unlocked and the rotational position in the locked state is maintained. Become.

  Here, in FIGS. 16 and 17, the tangential direction at the place where the circumferential surface of the locking pin 14 and each corner 64a, 64b of the locking claw 64 abut, in other words, the center of the locking pin 14. The angle formed by the line segment direction perpendicular to the line segment connecting the centers of curvature radii c1 and c2 of the corner portions 64a and 64b with respect to the rotation circumferential tangent direction of the lock ring is defined as the contact angle, and the unlocked state When the contact angle in the locked state is obtained, the contact angles θ1 and θ2 shown in FIGS. 16 and 17, respectively, are obtained. In the unlocked state of FIG. 16, the proximal end side corner 64 a of the locking claw 64 is brought into contact with the circumferential surface of the locking pin 14 at a position closer to the inner diameter side of the lock ring 6 than in the locked state. Therefore, the contact angle θ1 in the unlocked state is smaller than the contact angle θ2 in the locked state. The smaller the contact angle, the smaller the frictional load at the contact point between the locking claw 64 and the circumferential surface of the locking pin 14, and the locking claw 64 has a larger engagement with the locking pin 14 than when the contact angle is large. It becomes easier to get over the circumference. Therefore, the rotational force when rotating the lock ring 6 is reduced. That is, when the lock ring 6 is rotated from the unlocked state of FIG. 16 toward the locked state of FIG. 17, the lock ring 6 is rotated from the locked state of FIG. 17 to the unlocked state of FIG. It becomes smaller than the rotational force when moving.

  Therefore, when the lock ring 6 is rotated by the motor 10 to switch between the unlocked state and the locked state, the rotational force required to rotate the lock ring 6 varies due to changes in environmental conditions. In particular, when the required turning force is increased to antagonize the maximum turning force of the motor 10, it is difficult to rotate the lock ring 6 from the locked state to the unlocked state. The lock ring 6 can be turned from the unlocked state to the locked state. Thereby, even if the lens holding frame 5 cannot be brought into the unlocked state, the lens holding frame 5 can be brought into the locked state, and the lens holding frame due to the lens holding frame 5 not being brought into the locked state. 5 and each part of the lens barrel associated therewith can be prevented from being damaged by an external force. A so-called fail-safe function is obtained.

  Here, since the base end portion 63a faces the counterclockwise direction and the free end portion 63b faces the clockwise direction, the locking spring piece 63 is locked by rotating the lock ring 6 clockwise. When switching from the released state to the locked state, the front end side corner 64a of the locking claw 64 is brought into contact with the circumferential surface of the locking pin 14, so that the intermediate portion of the locking spring piece 63 is bent in the outer diameter direction. So-called buckling may occur. FIG. 18 is an enlarged rear view showing a state in which this buckling has occurred. Due to buckling, the locking spring piece 63 is bent in the outer diameter direction, and the locking claw portion 64 is also moved somewhat in the outer diameter direction. The position of the contact surface with the locking pin 14 is displaced in the outer diameter direction, the contact angle θ3 is somewhat increased from the contact angle θ1 of FIG. 16, and the friction load is also increased. However, as in this embodiment, the radius of curvature of the distal end side corner portion 64a of the locking claw portion 64 is made larger than that of the proximal end side corner portion 64b, thereby suppressing an increase in the contact angle θ3 and increasing the friction load. Can be suppressed. If the curvature radius of the distal end side corner portion 64a is the same as or larger than that of the proximal end side corner portion 64b, the contact angle θ3 due to buckling cannot be ignored, but the contact angle is increased because the curvature radius is increased. It can be suppressed to a negligible level. As a result, an increase in the frictional load at the time of switching from the unlocked state to the locked state is suppressed, and the reliable switching to the locked state is possible.

  Thus, in this lock mechanism, the locking spring piece 63 for holding the lock ring 6 at the respective rotational positions in the locked state and the unlocked state is formed integrally with the lock ring 6. The number of parts can be reduced as compared with the spring piece 63 formed of a separate member from the lock ring 6. Further, the locking spring piece 63 is held in the locked state and the unlocked state by being brought into contact with the locking pin 14 in a state where the locking claw portion 64 gets over the locking pin 14 in the inner diameter direction. In this state, the locking spring piece 63 is in a free state in which it is hardly elastically deformed, and no stress is generated in the locking spring piece 63. Therefore, the locking spring piece 63 is not deformed due to fatigue, and the initial turning force of the motor 10 when starting the rotation of the lock ring 6 is reduced, so that the lock ring 6 can be quickly rotated. become.

  On the other hand, when an external force is applied in the direction of rotating the lock ring 6 against the locking state or the unlocking state, the locking claw portion 64 of the locking spring piece 63 contacts the locking pin 14. As a result, the rotation is locked, and the locked state and the unlocked state are maintained. When the motor 10 is driven and the lock ring 6 is rotated, the locking claw 64 moves over the locking pin 14 by the rotational force of the motor 10 as described above, so that the locked state and the unlocked state are achieved. It is possible to switch. At the time of this switching, due to the difference in the radius of curvature of the arcuate corners 64a and 64b of the locking claw 64, the turning force for switching from the unlocked state to the locked state is switched from the locked state to the unlocked state. As described above, it is possible to surely switch to the locked state by making it smaller.

  In this locking mechanism, the rotational force of the lock ring 6 depends on the contact angles θ1 to θ3 at the contact surface between the locking claw portion 64 of the locking spring piece 63 and the peripheral surface of the contact portion 14a of the locking pin 14. Therefore, by changing the diameter of the contact portion 14a of the locking pin 14, the contact angles θ1 to θ3 at the corner portions 64a and 64b of the locking claw portion 64 can be changed. Can be changed, and at the same time, the stability of maintaining the rotation position of the lock ring 6 can be adjusted. Therefore, by preparing a plurality of locking pins having the same standard of the press-fit portion 14b and different diameters of the contact portion 14a, by replacing them and attaching them to the fixed frame 1, the locking claw portion 64 and The frictional load generated by the contact with the locking pin 14 can be changed, and the rotational power can be adjusted.

  Alternatively, as shown in FIG. 15A, the contact portion 14a is configured as an eccentric pin 14A that is eccentric with respect to the press-fit portion 14b as a locking pin, and the locking pin 14A when attached to the fixed frame 1 is configured. The position in the radial direction of the peripheral surface of the contact portion 14a, that is, the peripheral surface position of the contact portion 14a in the radial direction of the lock ring 6 may be changed by appropriately adjusting the position in the rotation direction. In this case, for example, it is preferable that the press-fitting portion 14b has a spline structure so that the position in the rotation direction is fixedly held. Further, the locking pin abutting portion 14a abuts on the locking claw portion 64 and a surface on which the locking claw portion 64 abuts on the locking pin 14 smoothly as the locking spring piece 63 moves in an arc. Is not limited to a true cylinder, it may be formed of an elliptic cylinder, or one corner is formed on the arc surface as shown in FIG. 15 (b). The locking pin 14B comprised as the contact part 14a which consists of formed square pillars may be sufficient.

  Further, depending on the case, the direction of the locking spring piece 63 may be directed in the opposite direction to the above embodiment. Although not shown, the base end portion of the locking spring piece 63 is in the clockwise direction and the free end portion is in the counterclockwise direction. However, the shape of the locking claw portion 64 provided at the free end portion is the same shape, and the radius of curvature of the base end side corner portion facing the clockwise direction is larger than the radius of curvature of the tip end side corner portion facing the counterclockwise direction. Also make it bigger. Even if the locking spring piece is configured in this manner, the lock ring 6 can be held in the unlocked state and the locked state, and the friction load when switching from the unlocked state to the locked state is reduced, as in the above-described embodiment. Thus, it is possible to smoothly and surely switch to the locked state. In this way, the buckling spring piece 63 does not buckle when switching from the unlocked state to the locked state, and an increase in the frictional load can be prevented and a more reliable switching to the locked state is possible. Become.

  The camera shake correction device ROD having the lock mechanism of the present invention is disposed in the lens barrel CL of the camera CAM as shown in FIG. Image blurring of the captured image can be eliminated, and by switching to the unlocked state or the locked state by the lock mechanism, stable camera shake correction can be performed in the unlocked state, and the correction lens frame 5 can be used in the locked state. It is possible to realize a small camera CAM with high photographing performance that incorporates a highly reliable camera shake correction device without moving and being damaged unexpectedly.

  Needless to say, the lock mechanism of the present invention can be installed in a lens barrel of an interchangeable lens camera provided with a camera shake correction device. You may decorate it. The optical device including the lock mechanism of the present invention is not limited to a lens barrel, and may be a camera including the lens barrel, particularly a camera that captures still images and moving images.

  The present invention is effective when employed in an optical apparatus such as a lens barrel and a camera provided with a camera shake correction device and capable of switching the camera shake correction device between an unlocked state and a locked state, and a lens barrel and a camera.

DESCRIPTION OF SYMBOLS 1 Fixed frame 2 Rear yoke 3 Front yoke 4 Base plate 5 Correction lens frame (correction moving body)
6 Lock ring (lock member)
7 Flexible substrate 8A, 8B Ball retainer 9x, 9y Hall element base 10 Motor 11 Y guide portion 12 Guide 13 Photo interrupter 14 Locking pin (contact member)
14a Contact part 14b Press fit part 15 Arc groove part 21x, 21y Rear magnet 22 Post 31x, 31y Front magnet 53x, 53y Drive coil 54x, 54y Position detection magnet 55 Insertion hole 57 Ring rib 58 Projection 62 Cam recess 63 Locking spring piece (Locking piece)
64 Locking claw portion 64a Front end side corner portion 64b Base end side corner portion 71x, 71y Hall element CAM camera (optical apparatus)
CL lens barrel (optical equipment)
CB camera body ROD correction optical device (camera shake correction device)
XM, YM Magnetic actuator XS, YS Position sensor IS Image sensor

Claims (10)

A locking mechanism capable of locking a correction moving body for image correction by being moved relative to the fixed portion with respect to the fixed portion;
The locking mechanism is moved between at least two movement positions, to allow the movement of the correction moving body at a first movement position, a locking member for locking the movement of said correction movement body in a second movement position Prepared,
The lock member includes a locking piece for engaging with a part of the fixed portion and holding the movement position of the lock member when moved to the two movement positions,
The fixing portion is provided in a part of a movement region of the locking piece, and is provided with a contact member that contacts the locking piece and locks the locking piece,
The abutting member is configured such that at least a portion that abuts on the locking piece is an arc surface,
The locking piece has a locking claw portion that contacts the arc surface of the contact member,
The locking claw is formed such that a corner of an end contacting the arc surface when the locking piece moves between the two moving positions is formed in an arc shape,
The radius of curvature of each corner at both ends in the circumferential direction contacting the arc surface when moving in the opposite direction between the two moving positions is different from the first moving position to the second The radius of curvature of the corner that contacts when moving to the moving position is larger than the radius of curvature of the corner that contacts when moving from the second moving position to the first moving position . A locking mechanism characterized by that. The lock mechanism according to claim 1, wherein the contact member is configured to be detachable with respect to the fixed portion, and is configured to be able to change a relative position of the arc surface with respect to the locking piece. .   The lock member is configured as a lock ring that is rotated about an axis, and is configured to lock the correction moving body at an inner diameter edge thereof, and the locking piece is a circumference of the outer diameter edge of the lock ring. The locking portion is configured as a locking spring piece elastically deformable in the radial direction of the lock ring, and the fixed portion is disposed in a part of a rotation region of the locking piece and contacts the locking piece and The locking mechanism according to claim 1, wherein a contact member that locks the locking piece is provided. The lock mechanism according to claim 3 , wherein the contact member is configured to be detachable with respect to the fixed portion, and is configured to be able to change a relative position of the arc surface with respect to the locking piece. . The lock mechanism according to claim 4 , wherein the contact member is configured so that a plurality of cylindrical members having different diameters can be replaced and disposed. The lock mechanism according to claim 4 , wherein the contact member is formed of an eccentric cylindrical member whose mounting position in a rotation direction can be changed with respect to the fixed portion. The locking piece includes a base end portion having a circumferential end connected to the lock ring, and a predetermined length extending from the base end portion in the circumferential direction of the lock ring. claw part is provided, and to claims 3, characterized in that the corners of the edge of the distal end side and the proximal side of the outer diameter side of the engaging claw portion is formed in an arc shape, respectively 6 The locking mechanism according to any one of the above. The lock mechanism according to any one of claims 3 to 7, wherein the lock ring is rotated between the first and second movement positions by a motor disposed in the fixing portion. A locking mechanism capable of locking a correction moving body for image correction by being moved relative to the fixed portion with respect to the fixed portion;
The correction moving body supports a correction lens for correcting image blur of a subject image formed by the lens optical system,
The fixing portion is a fixing portion of a lens barrel of the lens optical system;
The lock mechanism is an annular lock ring that is supported by the fixed portion and rotated around a cylinder axis of the lens barrel;
A locking piece integrally formed on a part of the outer peripheral edge of the lock ring and elastically deformable in the radial direction of the lens barrel;
An abutting member disposed at a position on the outer diameter side of the locking piece of the fixing portion and engaged with the locking piece;
The lock ring is rotated between two movement positions of an unlocked state that allows movement of the correction moving body and a locked state that locks the movement,
The contact member is configured such that when the lock ring is rotated to the two movement positions, the locking piece is contacted and the lock ring is held at the rotation position.
The abutting member is configured such that at least a portion that abuts on the locking piece is an arc surface,
The locking piece has a locking claw portion that contacts the arc surface of the contact member,
The locking claw portion is formed in an arc shape at the corner of the end that comes into contact with the arc surface when the locking piece rotates between the two movement positions.
When the two movement positions move in the opposite directions, the curvature radii of the respective corners at both ends in the circumferential direction contacting the arc surface are different, and the lock position is changed from the movement position in the unlocked state. The radius of curvature of the corner on the abutting side when moving to the moving position in the state is larger than the radius of curvature of the corner on the abutting side when moving from the moving position in the locked state to the moving position in the unlocked state. A locking mechanism characterized by being enlarged .   An optical apparatus such as a lens barrel or a camera provided with the lock mechanism according to claim 1.

Images