JP2007164001A - Cam mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cam mechanism which removes a play between a cam pin and a cam groove without increasing the number of component items and without enlarging the cam mechanism, causes no plastic deformation of the cam pin and the cam groove even in the occurrence of an unnatural force which moves the cam pin in a breadthwise direction of the cam groove, and operates thereafter. <P>SOLUTION: The cam mechanism is characterized in that: one side face of a cam groove 118 of one member 111 is constituted of an elastically deforming piece 117 which is elastically deformed in a breadthwise direction of the cam groove; and a cam pin 129 projectingly provided on the other member is elastically held between the elastically deforming piece and the other side face of the cam groove. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cam mechanism that is provided between two members that can move relative to each other and that moves the two members relative to each other.

  The cam mechanism as described above is used in various fields. For example, those applied to a lens barrel are widely known.

  In this type of lens barrel, a cam pin protrudes from the outer peripheral surface of a lens support ring that supports a lens group, and the cam pin can be engaged with a cam ring that is located concentrically on the outer peripheral side of the lens support ring. It has a structure with grooves.

  Generally, the width of the cam groove is set to be substantially the same as the diameter of the cam pin, and the side surface of the cam groove is formed of a hard material that cannot be elastically deformed. For this reason, if an excessive external force is applied to the lens support ring and the cam pin tries to move in the width direction of the cam groove, a strong force is generated between the cam pin and the side surface of the cam groove, and the cam pin or the cam groove may be plastically deformed. there were. If the cam pin or the cam groove is plastically deformed, the cam mechanism can no longer perform a smooth operation.

  For this reason, in the invention of Patent Document 1, an auxiliary ring is connected to the lens support ring via a spring means, and a cam pin protrudes from the outer peripheral surface of the auxiliary ring. When an excessive external force is applied to the lens support ring, the external force is absorbed by the spring means so that the external force is not transmitted to the cam pin and the cam groove.

  On the other hand, if the cam groove width is set larger than the cam pin diameter, this external force can be absorbed by the gap between the cam groove and the cam pin when an excessive external force is applied to the lens support ring. However, in such a structure, a backlash occurs between the cam pin and the cam groove, and an unpleasant sound is generated during the movement of the lens support ring.

  For this reason, in the invention of Patent Document 2, the width of the cam groove is designed to be larger than the diameter of the cam pin, and an elastic member (one-sided spring) is interposed between the cam groove and the cam pin, and the cam pin is placed in one of the cam grooves. The back of the cam pin and cam groove is removed by elastic contact with the side surface.

Further, in the invention of Patent Document 3, a support shaft (bearing shaft) is protruded from the lens support ring, and a hole formed in the center portion of the cam pin is loosely fitted to the support shaft. A spring means is provided between them, and the cam pin is elastically brought into contact with one side surface of the cam groove by the urging force of the spring means to remove the play between the cam pin and the cam groove.
Japanese Patent Laid-Open No. 8-21272 JP-A-6-194555 JP 59-164513 A

  However, the inventions of the above patent documents require various members in addition to the lens support ring (cam pin) and the cam ring (cam groove) (in Patent Document 1, spring means and auxiliary ring, in Patent Document 2, elastic member) In Patent Document 3, the spring means), the structure is complicated and the manufacturing cost becomes high.

  Furthermore, since the inventions of the respective patent documents require various members as described above, there is a drawback that the cam mechanism and the lens barrel are increased in size.

  The purpose of the present invention is to eliminate the backlash between the cam pin and the cam groove without increasing the number of parts and the size of the cam mechanism, and even when an unreasonable force is generated to move the cam pin in the width direction of the cam groove. Another object of the present invention is to provide a cam mechanism in which the cam pin and the cam groove are not plastically deformed and can perform a smooth operation thereafter.

  The cam mechanism of the present invention comprises a cam pin projecting from one member and a cam groove formed on the other member so that the cam pin is movably engaged and has a width substantially the same as the diameter of the cam pin. A cam mechanism for relatively moving two members, wherein one side surface of the cam groove is constituted by an elastically deformable piece elastically deformable in a width direction of the cam groove, and the other of the elastically deformed piece and the cam groove The cam pins are elastically sandwiched by the side surfaces of the above.

  It is preferable to provide a stopper that limits the deformable range of the elastic deformable piece within the elastic limit by contacting the elastic deformable piece in an elastically deformed state.

  This cam mechanism can be implemented in the following manner. That is, in addition to the above configuration, a fixed support substrate, a stage plate supported so as to be relatively movable in a direction parallel to the fixed support substrate, and a position between a lock position and an unlock position are substantially set with respect to the stage plate. A lock member that can move linearly in a direction orthogonal to each other, a plurality of lock holes that are drilled in one of the opposing portions of the lock member and the stage plate, and a protrusion provided on the other of the opposing portions of the lock member and the stage plate, A plurality of lock pins having a diameter smaller than that of the lock hole, each of which is pulled out from each of the lock holes when the lock member is located at the unlock position, and is fitted into each of the lock holes when located at the lock position; When a slide member that is slidable in a direction parallel to the fixed support substrate and is movable between a locked position and an unlocked position and the stage plate is in an inoperative state, The slide member is moved to the lock position, and when the stage plate is in an operating state, the drive means for moving the slide member to the unlock position, and the slide member and the lock member are formed on one of the slide members. A cam groove, projecting on the other of the slide member and the lock member, when the slide member is moved to the lock position, the lock member is moved to the lock position, and the slide member is moved to the unlock position. The cam pin that moves the lock member to the unlock position when moved can be provided.

  In this aspect, the cam groove further includes a locking engagement groove that engages with the cam pin when the slide member is positioned at the lock position, and the cam pin when the slide member is positioned at the unlock position. It is preferable to include an engaging groove at the time of unlocking.

  Further, the driving means generates a driving force for sliding the slide member by receiving the magnetic force generated by the magnetic force generator fixed to the fixed support substrate and the slide member and being fixed to the slide member. And a driving coil for driving.

  The cam mechanism can be implemented in the following manner. That is, in addition to the configuration of the cam mechanism described above, a non-movable rectilinear guide ring having a rectilinear guide groove that is a through groove parallel to the optical axis, and an inner peripheral side of the rectilinear guide ring, The movable lens frame having the cam pin that is relatively movable in the optical axis direction and passes through the rectilinear guide groove, and the cam pin that is positioned on the outer peripheral side of the rectilinear guide ring and penetrates the rectilinear guide groove. And a cam ring that has the cam groove to be engaged and that moves the moving lens frame forward and backward in the optical axis direction by rotating relative to the linear guide ring around the optical axis.

  The play of the cam pin and the cam groove is removed by the elastic deformation piece constituting the side surface of the cam groove. Moreover, when an excessive force that moves the cam pin in the width direction of the cam groove is generated, the elastically deformable piece is elastically deformed, so that an excessive load is not applied between the cam pin and the cam groove.

  Furthermore, since the elastic deformation piece is an element constituting the side surface of the cam groove, the elastic deformation piece does not increase the number of parts or increase the size of the cam mechanism.

  First, a first embodiment in which the cam mechanism of the present invention is applied to a lock mechanism of a camera shake correction device will be described with reference to FIGS. In the following description, as indicated by arrows in FIGS. 1 and 2, the horizontal direction of the camera shake correction device 30 of the digital camera 20 is defined as the X direction, the vertical direction is defined as the Y direction, and the front and back direction is defined as the Z direction.

  First, the camera shake correction device 30 to which the lock mechanism 100 according to the present invention is attached will be described.

  As shown in FIG. 1, an optical system including a plurality of lenses L1, L2, and L3 is disposed in the digital camera 20, and a hand shake correction device 30 is disposed behind the lens L3. .

  The camera shake correction device 30 has a structure shown in FIGS.

  As shown in the figure, the camera shake correction device 30 includes a front fixed support substrate 31 having a rectangular shape in front view made of a magnetic material such as soft iron, and a rear side made of a magnetic material such as soft iron having the same front shape as the front fixed support substrate 31. A fixed support substrate (fixed support substrate) 32 is provided. The three opposing surfaces of the front fixed support substrate 31 and the rear fixed support substrate 32 are connected by three columnar columns 36 extending in the front-rear direction, and the front fixed support substrate 31 and the rear fixed support substrate are connected. 32 are parallel to each other. A rectangular window hole 33 is formed in the center of the front fixed support substrate 31. Although not shown, through holes are formed at three locations on the front fixed support substrate 31. A mounting screw is inserted into each of these through holes, and each mounting screw is screwed into three female screw holes (not shown) formed on the inner surface of the camera body of the digital camera 20, whereby the front side fixed support substrate 31 is fixed. It is fixed to the camera body.

  Supporting protrusions 38 having a prismatic shape are provided at three positions on the rear surface of the front fixed support substrate 31 so as to extend rearward. The front half of a metal ball 39 is rotatably supported in a hemispherical recess (not shown) provided in the rear end surface of each support projection 38.

  As shown in FIGS. 2 and 4, X magnets MX in which the S pole and the N pole are arranged in the X direction are fixed to the left and right ends of the rear surface of the front fixed support substrate 31, respectively. These left and right X magnets MX are arranged in the X direction, and the positions in the Y direction coincide with each other. Then, when the front fixed support substrate 31 and the rear fixed support substrate 32 pass the magnetic flux of the X magnet MX, an X magnetic circuit is formed between the left and right X magnets MX and the facing portion of the rear fixed support substrate 32. Is formed. That is, the front fixed support substrate 31 and the rear fixed support substrate 32 function as a yoke.

  On the other hand, a pair of Y magnets MY in which the S pole and the N pole are arranged in the Y direction are fixed to the lower end portion of the rear surface of the front fixed support substrate 31. These left and right Y magnets MY are aligned with each other in the X direction, and the positions in the Y direction coincide with each other. Then, as shown in FIG. 6, the front fixed support substrate 31 and the rear fixed support substrate 32 pass the magnetic flux of the left and right Y magnets MY, so that the left and right Y magnets MY and the rear fixed support substrate 32 face each other. A magnetic circuit for Y is formed between the portions. That is, the front fixed support substrate 31 and the rear fixed support substrate 32 function as a yoke.

  A reinforcing plate (stage plate) 61 having the same front shape as the electric substrate 60 is fixed to the rear surface of the flat electric substrate (stage plate) 60, and the electric substrate 60 and the reinforcing plate 61 are integrated. As shown in FIGS. 5 and 6, three balls 39 are rotatably in contact with three positions on the front surface of the electric substrate 60. Further, at three locations corresponding to the balls 39 on the rear surface of the reinforcing plate 61, a rectangular low friction contact made of a low friction material such as a fluororesin (a material having a small coefficient of friction with the rear fixed support substrate 32). Each member 41 is fixed. As shown in FIGS. 5 and 6, the rear surface of each low friction contact member 41 is slidably in contact with the front surface of the rear fixed support substrate 32. As described above, the electric board 60 and the reinforcing plate 61 are sandwiched from the front and rear directions by the three balls 39 and the three low friction contact members 41 (rear side fixed support board 32), and both are placed on the optical axis O of the lenses L1 to L3. They are orthogonal to each other (parallel to the front fixed support substrate 31 and the rear fixed support substrate 32).

  Furthermore, movement range restriction holes (may be cutouts) 63 through which the respective pillars 36 pass are formed at three positions of the electric board 60 and the reinforcing plate 61 (the movement range restriction holes 63 at the lower end portion are cutouts). Therefore, the electric board 60 and the reinforcing plate 61 are in the X direction with respect to the front side fixed support board 31 and the rear side fixed support board 32 from the initial position shown in FIG. And can move on an XY plane (perpendicular to the optical axis O) parallel to the Y direction.

  A CCD (imaging device) 65 is fixed to the front central portion of the electric substrate 60. As shown in FIGS. 2 to 4, the CCD 65 has a rectangular shape when viewed from the front, and in FIG. 4 (when the electric substrate 60 is in the initial position), a pair of upper and lower X direction side edges 65X parallel to the X direction (FIG. 3). 4) and a pair of left and right sides 65Y (see FIGS. 3 and 4) parallel to the Y direction in FIG.

  A CCD holder 67 surrounding the CCD 65 is fixed to the front surface of the electric substrate 60 in an airtight state. A window hole 68 is formed in the front wall of the CCD holder 67. An optical low-pass filter 69 is fitted and fixed between the front wall of the CCD holder 67 and the CCD 65, and an airtight state is maintained between the optical low-pass filter 69 and the front wall of the CCD holder 67. As shown in FIG. 6, the CCD holder 67 is loosely fitted in the window hole 33 of the front fixed support substrate 31 so as to be relatively movable (in a range where the support column 36 does not contact the movement range regulating hole 63). The imaging surface 66 of the CCD 65 is an imaging surface on which an image transmitted through the lenses L1 to L3 and the optical low-pass filter 69 is formed. Further, when the electric substrate 60 is in the initial position (when in the state shown in FIG. 4), the center of the imaging surface 66 of the CCD 65 is positioned on the optical axis O.

  As shown in FIG. 4, the left and right ends of the electric board 60 and the reinforcing plate 61 are located at positions corresponding to the left and right X magnetic circuits, respectively (the left and right X magnets MX are opposed to each other in the front-rear direction. ing).

  The X-direction driving coils CX having the same specifications are fixed to the front surfaces of the left and right ends of the electric board 60 and the reinforcing plate 61, respectively. The X-direction driving coil CX is a coil parallel to the XY plane in which the coil wire is wound in a spiral shape more than 100 times (which is wound in the direction parallel to the electric board 60 and in the thickness direction of the electric board 60). Yes, the left and right X-direction drive coils CX are aligned in a direction parallel to the X-direction side 65X (aligned in the X direction in FIG. 4). In other words, the positions of the left and right X-direction drive coils CX in the direction parallel to the Y-direction side 65Y (the positions in the Y-direction in FIG. 4) match.

  The X direction drive coil CX, the front fixed support substrate 31, the rear fixed support substrate 32, and the X magnet MX constitute an X direction drive means.

  As shown in FIG. 4, the lower ends of the electric board 60 and the reinforcing plate 61 are located at positions facing the left and right Y magnetic circuits in the front-rear direction.

  A Y-direction driving coil CYA and a Y-direction driving coil CYB having the same specifications are fixed to the front surfaces of the lower ends of the electric board 60 and the reinforcing plate 61. Both the Y-direction driving coil CYA and the Y-direction driving coil CYB have coil wires wound in a spiral shape more than 100 times (in the direction parallel to the electric substrate 60 and in the thickness direction of the electric substrate 60). ) The coil is parallel to the XY plane, and the Y-direction driving coil CYA and the Y-direction driving coil CYB are arranged along the lower X-direction side 65X (in FIG. 4, they are arranged in the X direction). . In other words, the Y-direction driving coil CYA and the Y-direction driving coil CYB have the same position in the direction parallel to the Y-direction side 65Y (Y-direction position in FIG. 4).

  The Y direction driving coil CYA and the Y direction driving coil CYB, the front fixed support substrate 31, the rear fixed support substrate 32, and the Y magnet MY constitute a Y direction drive means.

  The X-direction driving coil CX, the Y-direction driving coil CYA, and the Y-direction driving coil CYB are electrically connected to a control unit configured by a CPU or the like built in the camera.

  The camera shake correction apparatus 30 having the above configuration performs a camera shake correction operation by causing a current to flow from the control unit to the X direction driving coil CX, the Y direction driving coil CYA, and the Y direction driving coil CYB.

  That is, when a current is passed through the X direction driving coil CX, a driving force in the direction of the arrow FX1 or FX2 in FIG. 4 is generated in the X direction driving coil CX. Further, when a current is passed through the Y-direction driving coils CYA and CYB, a driving force in the direction of the arrow FY1 or FY2 in FIG. 4 is generated in the Y-direction driving coils CYA and CYB.

  As is well known, when the camera body vibrates in the X direction or Y direction due to camera shake, the movement distance (camera shake amount) of the camera body in the X direction and Y direction is detected, and the CCD 65 is detected as the camera shake direction relative to the camera body. If the linear movement is made in the opposite direction by the same distance as the amount of camera shake, the camera shake (image shake) of the CCD 65 is corrected. Therefore, if the current flows from the control means to the X direction driving coils CX and the Y direction driving coils CYA and CYB so that the CCD 65 performs such a linear movement, camera shake in the X direction and the Y direction of the CCD 65 will occur. It is corrected.

  Further, since the electric board 60 and the reinforcing plate 61 (CCD 65) can be rotated relative to the front side fixed support board 31 and the rear side fixed support board 32, the Y direction driving coil CYA and the Y direction driving coil CYB from the control means. When the directions of the currents flowing in the Y direction drive coils are reversed and Y direction driving coils CYA and Y direction driving coils CYB generate driving forces in opposite directions, the electric board 60 and the reinforcing plate 61 (CCD 65) rotate. Therefore, if current is supplied from the control means to the Y direction driving coil CYA and the Y direction driving coil CYB so that the electric board 60 and the reinforcing plate 61 (CCD 65) rotate in the direction opposite to the rotational shake direction, so-called rotation is performed. The shake is corrected.

  Next, the lock mechanism 100 to which the present invention is applied, which is mounted on the above-described hand movement correction device 30, will be described.

  The lock mechanism 100 includes the components described below.

  A pair of left and right lock holes 101 penetrating them in the front-rear direction are formed in the upper ends of the electric board 60 and the reinforcing plate 61.

  On the other hand, a square hole 102 is formed in the central portion of the rear fixed support substrate 32. In the vicinity of the upper end of the rear surface of the rear fixed support substrate 32, the left and right ends of the support member 103 are fixed by screws. The support member 103 includes a hanging piece 104 parallel to the electric board 60 and the reinforcing plate 61, and a horizontal piece 105 positioned horizontally and directly above the rear fixed support board 32. The support member 103 is formed with a rectangular through hole 107 extending over the hanging piece 104 and the horizontal piece 105. Near the right end portion of the hanging piece 104, the right end portion of the leaf spring 108 parallel to the X direction is fixed. A holding pin 109 protruding forward from the leaf spring 108 is provided at the left end portion of the leaf spring 108.

  On the upper surface of the horizontal piece 105, a horizontal plate portion 112 which is a component of the lock member 111 is placed. In the left and right ends of the horizontal plate portion 112, Z-direction long holes 113 facing the Z direction are formed. A pair of fixing screws that respectively penetrate the Z-direction long holes 113 are screwed into the screw holes of the horizontal piece 105. Therefore, the lock member 111 is slidable with respect to the support member 103 in the front-rear direction between the lock position shown in FIGS. 5 and 8 and the unlock position shown in FIGS.

  Further, a vertical plate portion 114 having a lateral dimension shorter than the horizontal plate portion 112 and the rectangular through hole 107 protrudes from the front edge portion of the horizontal plate portion 112. The vertical plate portion 114 is positioned below the horizontal piece 105 through the rectangular through hole 107 and is positioned immediately in front of the electric board 60. A pair of left and right cylindrical lock pins 115 extend rearward from the rear surface of the vertical plate portion 114. The lock pin 115 has a smaller diameter than the lock hole 101. The left and right lock pins 115 can be engaged with and disengaged from the electric board 60 and the lock hole 101 of the reinforcing plate 61, respectively.

  When the lock member 111 is positioned at the unlock position in a state where the electrical board 60 and the reinforcing plate 61 are positioned at the initial position, the left and right lock pins 115 are moved from the left and right lock holes 101 as shown in FIGS. Escape forward. On the other hand, when the lock member 111 is positioned at the lock position in a state where the electric board 60 and the reinforcing plate 61 are positioned at the initial position, the left and right lock pins 115 are moved to the left and right lock holes 101 as shown in FIGS. Therefore, the electric board 60 and the reinforcing plate 61 are held (locked) at the initial position.

  The horizontal plate portion 112 of the lock member 111 is provided with a pair of left and right cam grooves (cam mechanisms) 118. The rear wall of the cam groove 118 is constituted by an elastically deformable piece (plate spring) 117 that projects integrally with the horizontal plate portion 112.

  The solid lines in FIGS. 5 and 13 show the state where the elastic deformation piece 117 is located at the normal position. The free end portion (the right end portion in FIGS. 5 and 13) of the elastic deformation piece 117 is elastically deformed rearward, thereby causing an elastic deformation position (position of an imaginary line in FIG. 13) to contact the stopper 116 protruding from the lock member 111. ). The deformation state from the free state of the elastic deformation piece 117 to the contact with the stopper 116 is all elastic deformation (deformation within the elastic limit and not accompanied by plastic deformation).

  Due to the elastic deformation piece 117, the cam groove 118 is substantially S-shaped in plan view. The cam groove 118 is located at the leftmost position in the unlocking engagement groove 119 parallel to the X direction, the rightmost position in the locking engagement groove 120 parallel to the X direction, and the unlocking engagement groove 119. And an inclined groove 121 that is inclined with respect to the X direction connecting the engaging grooves 120 when locked.

  The vertical plate portion 123 of the slide member 122 is slidably in contact with the rear surface of the hanging piece 104 of the support member 103. Three vertical holes 124 in the X direction are formed in the vertical plate portion 123, and screws penetrating the X direction long holes 124 in the Z direction are respectively screwed into the screw holes of the drooping piece 104. Therefore, the slide member 122 can slide in the X direction between the lock position in FIG. 4 and the unlock position in FIG. 9 according to the fitting relationship between the screw and the X-direction long hole 124. The vertical plate portion 123 is formed with a pair of left and right engaging grooves, that is, a locked state holding groove 125 and an unlocked state holding groove 126. As shown in the figure, the leaf spring 108 and the holding pin 109 are located immediately after the vertical plate portion 123, and when the slide member 122 is located at the locked position, the holding pin 109 of the leaf spring 108 is elastically engaged with the locked state holding groove 125. Engage and hold the slide member 122 in the locked position. On the other hand, when the slide member 122 is located at the unlocked position, the holding pin 109 is elastically engaged with the unlocked state retaining groove 126 to hold the slide member 122 at the unlocked position.

  The horizontal plate portion 128 extending forward from the upper edge portion of the vertical plate portion 123 is located in the rectangular through hole 107 of the support member 103 so as to be movable in the X direction, and is located immediately below the horizontal plate portion 112. is doing. Further, a pair of left and right cylindrical cam pins 129 (cam mechanisms) are provided on the upper surface of the horizontal plate portion 128 so as to be fitted in the left and right cam grooves 118, respectively.

  The front-rear width of the cam groove 118 and the diameter of the cam pin 129 have the following relationship. That is, when the cam pin 129 is not engaged with the cam groove 118, the cam groove 118 is narrower than the cam pin 129. However, when the cam pin 129 is engaged with the cam groove 118, the elastic deformation piece 117 is slightly elastically deformed rearward, and the cam pin 129 is elastically sandwiched between the elastic deformation piece 117 and the cam groove 118. Therefore, no play occurs between the cam pin 129 and the cam groove 118.

  A lock driving coil CXR that is electrically connected to the control means is fixed to the rear surface of the lower end of the slide member 122. The lock driving coil CXR is a coil parallel to the XY plane in which a coil wire is wound in a spiral shape more than 100 times (which is wound in the direction parallel to the electric board 60 and in the thickness direction of the electric board 60). is there. As shown in FIG. 18, the lock driving coil CXR includes a right side CX1, a left side CX2, an upper side CX3, and a lower side CX4. The right side CX1 and the left side CX2 are parallel to the Y-direction side 65Y, and the upper side CX3 and the lower side CX4 are parallel to the X-direction side 65X.

  On the rear surface of the rear fixed support substrate 32, a left end portion of a front yoke (driving means) 130 made of a magnetic material such as soft iron is fixed with a screw. The front yoke 130 is bent so that the right side portion 131 is positioned in front of the left end portion. The right portion 131 is parallel to the electric board 60 and the reinforcing plate 61 and is located in the square hole 102 (see FIG. 16). A rear yoke (driving means) 133 made of a magnetic material such as soft iron is connected to the rear surface of the front yoke 130 through three spacers 134 and screws in parallel with the right portion 131. Further, a locking magnet (driving means) MXR in which the N pole and the S pole are arranged in the X direction is fixed to the front surface of the rear yoke 133. A magnetic circuit is formed between the locking magnet MXR (rear yoke 133) and the right portion 131 by passing the magnetic lines of force of the locking magnet MXR through the right portion 131 and the rear yoke 133.

  The lock driving coil CXR and the lower end portion of the slide member 122 are positioned so as to be relatively movable in the X direction between the lock magnet MXR and the right portion 131. Further, regardless of the position of the slide member 122 between the locked position and the unlocked position, the right side CX1 and the N pole of the lock driving coil CXR always maintain an overlapping relationship in the front-rear direction as shown in FIG. In addition, the left side CX2 and the S pole always maintain an overlapping relationship in the front-rear direction.

  Next, the operation of the lock mechanism 100 configured as described above will be described.

  When the main power supply of the digital camera 20 is OFF, and when the main power supply is ON and the camera shake correction switch SW is OFF, the electric board 60 and the reinforcing plate 61 are located at the initial position of FIG. Located in 4, 5 and 8 locked positions. Further, the lock member 111 is positioned at the lock position shown in FIGS. 4, 5 and 8, and the left and right cam pins 129 engage with the engagement grooves 120 when the left and right cam grooves 118 are locked. Therefore, as shown in FIG. 7, the left and right lock pins 115 are fitted in the left and right lock holes 101 of the electric board 60 and the reinforcing plate 61, respectively, and the electric board 60 and the reinforcing plate 61 are locked to the initial positions. In this locked state, even if the digital camera 20 is vibrated, the electric board 60 and the reinforcing plate 61 do not move relative to the camera body.

  When the hand shake correction switch SW is turned on in this state, a current in the direction of the arrow in FIG. 18 flows from the control means to the lock driving coil CXR, and a driving force in the FX3 direction shown in FIG. 18 is generated in the lock driving coil CXR. To do. Then, the slide member 122 slides to the unlock position shown in FIGS. 9 and 10, so that the left and right cam pins 129 positioned in the lock engagement groove 120 pass through the inclined groove 121 and the left and right cam grooves 118 are unlocked. The lock member 111 moves into the engagement groove 119 when locked, and the lock member 111 moves to the unlock position shown in FIG. Then, as shown in FIG. 11, the left and right lock pins 115 escape forward from the left and right lock holes 101, so that the electric board 60 and the reinforcing plate 61 can perform a shake correction operation (rotational shake operation).

  Further, when the main power supply of the digital camera 20 is turned off or the camera shake correction switch SW is turned off from this state, the control means supplies current to the X direction driving coil CX, the Y direction driving coil CYA, and the Y direction driving coil CYB. To move the electric substrate 60 and the reinforcing plate 61 to the initial positions shown in FIG. Further, a current in the direction opposite to the arrow in FIG. 18 flows from the control means to the lock driving coil CXR, and a driving force in the FX4 direction in FIG. 18 is generated in the lock driving coil CXR. Then, the slide member 122 returns to the locked position, and the left and right cam pins 129 that have been located in the unlocking engagement groove 119 pass through the inclined groove 121 into the locking engagement groove 120 of the left and right cam grooves 118. The lock member 111 returns to the lock position. As a result, the left and right lock pins 115 are fitted into the left and right lock holes 101 from the front, and the electric board 60 and the reinforcing plate 61 are locked at the initial positions.

  Furthermore, the lock mechanism 100 performs a buffering action when the lock pin 115 cannot be fitted into the lock hole 101 during the transition from the unlocked state to the locked state.

  That is, when the slide member 122 moves to the lock position in a state where the electric board 60 and the reinforcing plate 61 are not accurately positioned at the initial position of FIG. 4, the lock pin 115 contacts the front surface of the electric board 60 as shown in FIG. . At this time, the lock member 111 moves relative to the cam pin 129 forward while the cam pin 129 is positioned in the engagement groove 120 at the time of locking. Accordingly, as indicated by the phantom line in FIG. 13, the cam pin 129 moves rearward relative to the lock member 111, and the cam pin 129 elastically deforms the free end portion of the elastic deformation piece 117 at the normal position rearward. The deformation piece 117 is elastically deformed to the elastic deformation position indicated by the phantom line in FIG.

  As described above, when the lock pin 115 cannot be fitted into the lock hole 101 at the time of locking, the elastic deformation piece 117 is elastically deformed so that an excessive force is not applied to the lock member 111 and the cam pin 129. Even if the pin 115 cannot be fitted into the lock hole 101, the lock member 111 and the cam pin 129 are not damaged.

  The lock mechanism 100 described above has the following effects in addition to the buffering effect.

  That is, since the pair of lock pins 115 having a smaller diameter than the lock hole 101 are fitted into the pair of lock holes 101 to lock the electric board 60 and the reinforcing plate 61 at the lock position, a reliable lock state can be obtained. .

  Further, since the electric board 60 and the reinforcing plate 61 (CCD 65) can rotate relative to the front fixed support board 31 and the rear fixed support board 32, if one lock hole and one lock pin are provided, the electric board 60 and the reinforcing plate 61 are locked to the lock hole. Even if the pins are fitted, the rotation of the electric substrate 60 and the reinforcing plate 61 (CCD 65) cannot be restricted. However, since the rotation of the electric substrate 60 and the reinforcing plate 61 (CCD 65) can be restricted if the structure is locked by the pair of lock holes 101 and the lock pins 115 as in the present embodiment, the lock mechanism 100 of the present embodiment is It is especially useful when applied to a hand shake correction device capable of rotational shake correction.

  Further, since the lock member 111 is moved and moved in a direction substantially orthogonal to the electric board 60 and the reinforcing plate 61, the locking member is moved in a direction parallel to the electric board 60 and the reinforcing plate 61. The movement stroke of the locking member (locking member 111) is shorter than that in the case of making it. Therefore, the lock operation and the release operation can be performed in a shorter time than in the conventional case.

  Further, the hanging piece 104 of the slide member 122 and the support member 103 is positioned behind the rear fixed support substrate 32, and the horizontal piece 105 of the lock member 111 and the support member 103 is directly above the camera shake correction device 30 (outer peripheral side). ), The space (dead space) formed between the camera shake correction device 30 and the camera body existing behind the rear fixed support substrate 32 and immediately above the camera shake correction device 30 is effectively used. Yes. In addition, since the vertical plate portion 114 and the lock pin 115 are positioned between the front fixed support substrate 31 and the electric substrate 60, the combined size of the lock mechanism 100 and the hand shake correction device 30 in the Z direction is minimized. Is suppressed.

  In addition, as shown in FIG. 16, the right portion 131 of the front yoke 130 is positioned in the square hole 102 of the rear fixed support substrate 32, and a part of the lock driving coil CXR is positioned in the square hole 102. Therefore, the combined body of the hand shake correction device 30 and the lock mechanism 100 is prevented from becoming large in the Z direction.

  Further, since the rear fixed support substrate 32 is reduced in weight by forming the square holes 102 in the rear fixed support substrate 32, the weight of the camera shake correction device 30 and the camera body is reduced.

  Next, a second embodiment in which the cam mechanism of the present invention is applied to a lens barrel will be described with reference mainly to FIGS.

  The zoom lens barrel 200 includes a straight guide ring 201 that cannot move relative to a camera body (not shown). The rectilinear guide ring 201 is provided with three rectilinear guide grooves 202 parallel to the optical axis O at intervals of 120 ° in the circumferential direction (only one is shown in the figure). Further, the rectilinear guide ring 201 is provided with three rectilinear guide grooves 203 parallel to the optical axis O at intervals of 120 ° in the circumferential direction immediately after the rectilinear guide groove 202 (only one is shown in the figure). .

  A first group moving lens frame (moving lens frame) 205 that is concentrically arranged in the optical axis O direction on the inner peripheral side of the rectilinear guide ring 201 and that can move relative to the rectilinear guide ring 201 in the optical axis O direction; A second group moving lens frame (moving lens frame) 206 is provided. The first lens unit L1 is fitted and fixed to the inner peripheral surface of the first group moving lens frame 205, and the second lens unit L2 is fitted and fixed to the inner peripheral surface of the second group moving lens frame 206. Three cam pins (cam mechanisms) 207 project from the outer peripheral surface of the first group moving lens frame 205 at intervals of 120 ° in the circumferential direction. The outer peripheral surface of the second group moving lens frame 206 is 120 ° in the circumferential direction. Three cam pins (cam mechanisms) 208 are projected at intervals (two cam pins 207 and two cam pins 208 are shown in FIG. 19 and only one is shown in the other drawings). Each cam pin 207 passes through the corresponding rectilinear guide groove 202 and projects to the outer peripheral side of the rectilinear guide ring 201, and each cam pin 208 passes through the corresponding rectilinear guide groove 203 and projects to the outer peripheral side of the rectilinear guide ring 201. Yes.

  On the outer peripheral side of the rectilinear guide ring 201, a cam ring 210 that is concentric with the rectilinear guide ring 201 and is rotatable relative to the rectilinear guide ring 201 around the optical axis O is disposed.

  The cam ring 210 has three substantially trapezoidal through holes 211 formed at intervals of 120 ° in the circumferential direction (only one is shown in the figure). A pair of front and rear elastic deformation pieces (plate springs) 212 and elastic deformation pieces (plate springs) 213 are integrally projected on the inner peripheral surface of the through hole 211. The elastic deformation piece 212 and the elastic deformation piece 213 can be elastically deformed in a direction substantially parallel to the optical axis O. A cam groove (cam mechanism) 214 whose width (front-rear dimension) is slightly narrower than the diameter of the cam pin 207 is formed between the elastic deformation piece 212 and the front edge portion of the through hole 211. A corresponding cam pin 207 is movably fitted in each cam groove 214, and each elastic deformation piece 212 elastically biases each cam pin 207 forward (the elastic deformation piece 212 and the front edge of the through hole 211). Part elastically holds the cam pin 207). Further, a cam groove (cam mechanism) 215 having a width (front-rear dimension) slightly narrower than the diameter of the cam pin 208 is formed between the elastic deformation piece 213 and the rear edge portion of the through hole 211. A corresponding cam pin 208 is movably fitted in each cam groove 215, and each elastic deformation piece 213 elastically biases each cam pin 208 rearwardly (the rear edge of the elastic deformation piece 213 and the through hole 211). Part elastically holds the cam pin 208).

  Between the free ends of the elastic deformation piece 212 and the elastic deformation piece 213, a stopper 216 protruding from the inner peripheral surface of the through hole 211 is located. As shown by the solid lines in FIGS. 19 and 21, the stopper 216 is normally not in contact with the elastic deformation piece 212 and the elastic deformation piece 213. The deformation state from the free state of the elastic deformation piece 212 and the elastic deformation piece 213 to contact with the stopper 216 is all elastic deformation (deformation within the elastic limit and not accompanied by plastic deformation).

  A cover ring 218 concentric with the cam ring 210 is provided on the outer peripheral side of the cam ring 210. As shown in FIG. 20, a female screw 218a formed at the front end portion of the inner peripheral surface of the cover ring 218 and a male screw 201a formed at the front end portion of the outer peripheral surface of the linear guide ring 201 are screwed together, so that the cover ring 218 moves straight forward. The guide ring 201 is fixed. The cam ring 210 is sandwiched between the cover ring 218 and the rectilinear guide ring 201 and is rotatable relative to the cover ring 218 and the rectilinear guide ring 201. The inner peripheral surface of the cover ring 218 is not in contact with the elastic deformation piece 212 and the elastic deformation piece 213.

  The zoom lens barrel 200 operates as follows.

  When the photographer manually rotates the cam ring 210 around the optical axis O, the first group moving lens frame 205 (first lens group L1) is moved along the optical axis O according to the relationship between the cam groove 214, the cam pin 207, and the straight guide groove 202. The position of the cam pin 207 indicated by the solid line in FIG. 21 is the tele end position, and the position of the cam pin 207 indicated by the phantom line in FIG. 21 is the wide end position. Similarly, the second group moving lens frame 206 (second lens group L2) advances and retreats in the direction of the optical axis O according to the relationship between the cam groove 215, the cam pin 208, and the rectilinear guide groove 203 (the position of the cam pin 208 indicated by the solid line in FIG. 21). Is the tele end position, and the position of the cam pin 208 indicated by the phantom line in FIG. 21 is the wide end position). In this way, zooming is performed by moving the first group moving lens frame 205 (first lens group L1) and the second group moving lens frame 206 (second lens group L2) back and forth in the optical axis O direction. Since the elastic deformation piece 212 and the front edge portion of the through-hole 211 elastically sandwich the cam pin 207, no play occurs between the cam pin 207 and the cam groove 214, and further, the elastic deformation piece 213 and the through-hole 211 pass through. Since the rear edge portion of the hole 211 elastically holds the cam pin 208, no play occurs between the cam pin 208 and the cam groove 215.

  Further, for example, when an external force is applied to the first group moving lens frame 205 in the state shown in FIG. 21 (the cam ring 210 is not rotated) and the first group moving lens frame 205 is pressed rearward, as shown by an imaginary line in FIG. Then, each elastic deformation piece 212 is elastically deformed rearward, and each cam pin 207 moves rearward in each linear guide groove 202. As the elastic deformation pieces 212 are elastically deformed in this way, the cam pins 207 and the elastic deformation pieces 212 are prevented from being excessively loaded and damaged.

  Similarly, when an external force is applied to the second group moving lens frame 206 in the state of FIG. 21 (the cam ring 210 is not rotated) and the second group moving lens frame 206 is pressed forward, as shown by the phantom line in FIG. Since each elastic deformation piece 213 is elastically deformed forward and each cam pin 208 is moved forward in each linear guide groove 203, it is possible to prevent an excessive load from being applied to the cam pin 208 and the elastic deformation piece 213.

  As mentioned above, although this invention was demonstrated based on said each embodiment, this invention is not limited to these embodiment, It can implement by giving various deformation | transformation.

  In the first embodiment, the following changes are possible.

  For example, as a driving means for moving the electric board 60 and the reinforcing plate 61, the front fixed support board 31, the rear fixed support board 32, the X magnet MX, the Y magnet MY, the X direction driving coil CX, the Y direction Although the drive coil CYA and the Y-direction drive coil CYB are used, other drive means such as a motor may be used.

  Further, although the lock magnet MXR and the lock drive coil CXR are used as the actuator for driving the slide member 122, other actuators such as a motor or a solenoid may be used.

  Further, the lock pin 115 may be provided on the electric substrate 60 or the reinforcing plate 61 side, and the lock hole 101 may be provided on the lock member 111 side. The number of these lock pins and lock holes may be three or more.

  Further, a hole (or notch) corresponding to the movement range restricting hole 63 is formed in the front fixed support substrate 31 or the front fixed support substrate 32, and a pin corresponding to the column 36 is protruded from the electric substrate 60 or the reinforcing plate 61. May be.

  Further, it goes without saying that an image pickup device other than the CCD 65, for example, a CMOS image sensor can be used.

  Further, the present invention can be applied to a conventionally known camera shake correction device in which the electric board 60 and the reinforcing plate 61 linearly move only in the X direction and the Y direction along the guide shaft and the like. Can be applied to a stage apparatus having a different use (an apparatus in which a specific member can linearly move or rotate in the X direction or the Y direction).

  On the other hand, the second embodiment can be modified as follows.

  For example, as shown in FIG. 22, an exchangeable elastic member 220, which is a member different from the cam ring 210 and integrally includes an elastic deformation piece 212 and an elastic deformation piece 213, is fixed to the cam ring 210. Also good. Thus, if the elastic deformation piece 212 and the elastic deformation piece 213 are separate members from the cam ring 210, the spring constant of the elastic deformation piece 212 and the elastic deformation piece 213 can be changed by changing the material of the replaceable elastic member 220. It becomes possible to easily obtain an optimum value.

  Of course, the present invention is applicable to lens barrels other than the zoom lens barrel.

  Furthermore, the cam mechanism of the present invention can be applied to various devices other than the hand shake correction device and the lens barrel.

  In any of the embodiments, a cam pin may be provided on a member provided with a cam groove, and a cam groove may be formed on a member provided with the cam pin.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal side view of a digital camera including a camera shake correction device according to a first embodiment of the present invention. It is a disassembled perspective view of a hand-shake correction apparatus. It is a rear view of an electric board and a reinforcement board. It is a rear view of the camera shake correction device and the lock mechanism in the locked state. It is a top view of the camera shake correction device and the lock mechanism in the locked state (left and right ends of the camera shake correction device are omitted). It is sectional drawing which follows the VI-VI arrow line of FIG. It is sectional drawing which follows the VII-VII arrow line of FIG. 4 (The right end part of the camera-shake correction apparatus is abbreviate | omitted). It is the side view seen in the VIII arrow direction of FIG. 4 (The lower end part of the camera-shake correction apparatus is abbreviate | omitting). It is a rear view of the camera shake correction device and the lock mechanism in the unlocked state. It is a top view of the camera shake correction device and the lock mechanism in the unlocked state (left and right ends of the camera shake correction device are omitted). FIG. 8 is a cross-sectional view similar to FIG. 7 in the unlocked state (the right end portion of the camera shake correction device is omitted). It is a side view similar to FIG. 8 in the unlocked state. It is a top view of a lock member and a cam pin. It is a rear view of a locking member. It is a side view of a locking member. It is sectional drawing which abbreviate | omits and shows the left and right both sides of a camera-shake correction apparatus and a locking mechanism in alignment with the XVI-XVI arrow line of FIG. It is a cross-sectional plan view of the electric board, the reinforcing plate, and the vertical plate portion of the lock member when the lock pin cannot be fitted into the lock hole. It is a rear view which shows typically the positional relationship of the coil for a lock drive, and the magnet for a lock. It is a disassembled perspective view which shows the one part annular member in the expansion | deployment state of the lens-barrel of 2nd Embodiment. It is a side view of a lens barrel showing the upper half section in cross section. It is a development view of a straight guide ring and a cam ring in a tele state. It is an expanded view of the linear guide ring and cam ring in the tele state of the modification of 2nd Embodiment.

Explanation of symbols

20 Digital camera (camera)
30 Hand shake correction device (stage device)
31 Front fixed support substrate (fixed support substrate)
32 Rear fixed support substrate (fixed support substrate)
33 Window hole 36 Prop 38 Supporting protrusion 39 Ball 41 Low friction contact member 60 Electric substrate (stage plate)
61 Reinforcement plate (stage plate)
63 Movement range regulation hole 65 CCD (imaging device)
65X X-direction side 65Y Y-direction side 66 Imaging surface 67 CCD holder 68 Window hole 69 Optical low-pass filter 100 Lock mechanism 101 Lock hole 102 Square hole 103 Support member 104 Drooping piece 105 Horizontal piece 107 Rectangular through-hole 108 Leaf spring 109 Holding Pin 111 Lock member 112 Horizontal flat plate portion 113 Z-direction long hole 114 Vertical plate portion 115 Lock pin 116 Stopper 117 Elastic deformation piece (leaf spring)
118 Cam groove (Cam mechanism)
119 Engagement groove at unlocking 120 Engaging groove at locking 121 Inclination groove 122 Slide member 123 Vertical plate portion 124 X-direction long hole 125 Locked state retaining groove 126 Unlocked state retaining groove 128 Horizontal plate portion 129 Cam pin (cam mechanism)
130 Front yoke (drive means) (magnetic force generator)
131 Right portion 133 Rear yoke (drive means) (magnetic force generator)
134 Spacer 200 Zoom lens barrel 201 Linear guide ring 202 203 Linear guide groove 205 Group 1 moving lens frame (moving lens frame)
206 2 group moving lens frame (moving lens frame)
207 208 Cam pin (cam mechanism)
210 Cam ring 211 Through hole 212 213 Elastic deformation piece (leaf spring)
214 215 Cam groove (cam mechanism)
216 Stopper 218 Cover ring 220 Exchangeable elastic member CX X direction driving coil (X direction driving means)
CXR lock drive coil (drive means) (drive coil)
CYA CYB Y direction driving coil (Y direction driving means)
Magnet for MX X (X direction drive means)
MXR lock magnet (drive means) (magnetic force generator)
MY Y magnet (Y direction drive means)
O Optical axis

Claims (6)

Relative movement of two members, comprising a cam pin protruding from one member and a cam groove formed on the other member, the cam pin being movably engaged and having the same width as the cam pin and the diameter In the cam mechanism for
One side surface of the cam groove is constituted by an elastically deformable piece that is elastically deformable in the width direction of the cam groove,
A cam mechanism characterized in that the cam pin is elastically held between the elastic deformation piece and the other side surface of the cam groove. The cam mechanism according to claim 1,
A cam mechanism comprising a stopper that limits the deformable range of the elastic deformation piece within an elastic limit by contacting the elastic deformation piece in an elastically deformed state. The cam mechanism according to claim 1 or 2,
A fixed support substrate;
A stage plate supported so as to be relatively movable in a direction parallel to the fixed support substrate;
A locking member capable of linearly moving between a locked position and an unlocked position in a direction substantially perpendicular to the stage plate;
A plurality of lock holes formed in one of the opposing portions of the lock member and the stage plate;
The lock member protrudes from the other of the opposing portions of the stage plate. When the lock member is located at the unlock position, the lock member escapes from the lock holes, and when the lock member is located at the lock position, the lock members protrude from the lock holes. A plurality of lock pins each having a smaller diameter than the lock hole,
A slide member slidable in a direction parallel to the fixed support substrate and movable between a locked position and an unlocked position;
Driving means for moving the slide member to the locked position when the stage plate is in an inoperative state, and moving the slide member to the unlock position when the stage plate is in an activated state;
The cam groove formed in one of the slide member and the lock member;
Projecting on the other of the slide member and the lock member, the lock member is moved to the lock position when the slide member is moved to the lock position, and the slide member is moved to the unlock position when the slide member is moved to the unlock position. The cam pin for moving the lock member to the unlock position;
A cam mechanism comprising: The cam mechanism according to claim 3, wherein
The cam groove includes a locking engagement groove that engages with the cam pin when the slide member is positioned at the lock position, and an unlocking mechanism that engages the cam pin when the slide member is positioned at the unlock position. A cam mechanism having a locking engagement groove; The cam mechanism according to claim 3 or 4,
The driving means is
A magnetic force generator fixed to the fixed support substrate;
A driving coil for driving that generates a driving force for sliding the slide member by receiving the magnetic force generated by the magnetic force generator fixed to the slide member;
A cam mechanism comprising: The cam mechanism according to claim 1 or 2,
A non-movable linear guide ring having a linear guide groove that is a through groove parallel to the optical axis;
A movable lens frame that is located on the inner peripheral side of the rectilinear guide ring, is movable relative to the rectilinear guide ring in the optical axis direction, and includes the cam pin passing through the rectilinear guide groove;
The movable lens is located on the outer peripheral side of the rectilinear guide ring and has the cam groove that engages with the cam pin that penetrates the rectilinear guide groove, and is relatively rotated about the optical axis with respect to the rectilinear guide ring. And a cam ring for moving the frame back and forth in the optical axis direction.

Images