JP2013025259A - Position control device of retreating optical element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position control device of a retreating optical element, which makes a retreating optical element move away from an optical axis with high driving efficiency and high accuracy in a compact configuration.SOLUTION: The position control device of a retreating optical element which can be inserted to and removed from on an optical axis of a photographic optical system has a retreating optical element holding member turnable around a turning shaft substantially parallel with the optical axis, in a forward/backward moving ring movable in an optical axis direction. A removal driving member is pivotally supported by a turning shaft substantially parallel with the optical axis in the forward/backward moving ring separately from the retreating optical element holding member, and an optical axis movement force of the forward/backward moving ring is converted to turn the removal driving member, and the removal driving member is brought into contact with the retreating optical element holding member to press and turn the retreating optical element holding member from an insertion position on the optical axis to a removal position. Positions of the respective turning shafts of the retreating optical element holding member and the removal driving member are determined so that a radius of turning of the removal driving member to a contact position between the retreating optical element holding member and the removal driving member is larger than that of the retreating optical element holding member to the contact position.

Description

  The present invention relates to a position control device for a retracting optical element that is inserted into and removed from a photographing optical axis in accordance with switching between a photographing state and a storage state.

  Retractable optical element that can move in a plane perpendicular to the optical axis as part of the photographic optical system as a technology that contributes to the miniaturization of the lens barrel, especially the thinning of the size in the optical axis direction when the lens barrel is not taken. There is known a configuration in which the retracting optical element is moved from a position on the photographing optical axis to a disengagement position radially outward when the storage state is set.

  In the lens barrel of Patent Document 1, a retractable lens frame 21 that can rotate (swing) around a rotation axis parallel to the optical axis is provided inside a retractable lens group support frame 20 that is movable in the optical axis direction. When the retractable lens group support frame 20 moves rearward in the optical axis direction from the shooting state to the retracted state, the position control cam 11a of the CCD frame 11 provided behind the retractable lens group support frame 20 is positioned on the position control protrusion 21f of the retractable lens frame 21. Abutting and rotating the retractable lens frame 21 in the direction away from the photographing optical axis.

  The lens barrel of Patent Document 2 is a mode in which the position adjustment in the optical axis direction can be performed when the third group lens 23 which is a retracting optical element is driven to retract, and the shaft supporting boss portion 10a of the third group frame 10 is provided. And a rotational drive member 35 that can be moved relative to each other in the optical axis direction and move together in the rotational direction. During retraction, the rotational drive member 35 is pressed by the end cam 14 to Accordingly, the third group frame 10 is driven to rotate around the support shaft 52.

  The lens barrel of Patent Document 3 is a mode in which the third lens group L3, which is a retracting optical element, can also perform an image stabilization (image blur correction) operation, and a fixed portion in the third lens group cylinder 15 A vibration unit 17 is supported so as to be movable in a plane orthogonal to the optical axis 16, and a shake correction optical system holding unit 19 is rotatably supported on the vibration unit 17. In the photographing state, image blur correction is performed by driving the vibration unit 17 using the voice coil motor 18. When in the retracted state, the drive unit 4a provided on the CCD base 4 is brought into contact with the contact part 19b of the shake correction optical system holding part 19 by moving the third lens group cylinder 15 in the optical axis direction to hold the shake correction optical system. The part 19 is rotated in a direction away from the optical axis.

JP 2003-315861 A JP 2008-170650 A JP 2007-163961 A

  The retracting operation of the retracting optical element is desired to be performed efficiently and accurately with a compact configuration as much as possible. Like the lens barrel in each of the above patent documents, the retracting optical element is retracted by converting the moving force in the optical axis direction of the moving member for performing the retracting operation of the photographing optical system into the rotating motion by the cam mechanism. In the configuration, the drive efficiency of the retraction movement (the retraction movement amount of the retraction optical element per unit movement amount of the storage movement member) can be set by setting the cam surface of the cam mechanism.

  However, in the configuration in which the holding member for the retracting optical element (blur correction optical system holding unit 19) is driven in the plane orthogonal to the optical axis by an application (anti-vibration) different from the retracting operation as in Patent Document 3, the vibration-proofing is performed. The contact position with the retracting drive cam (drive unit 4a) may change depending on the operation, which may affect the accuracy of the retracting operation. In order to avoid this, it is necessary to take measures such as holding the lens barrel after the holding member of the retracting optical element is held at a predetermined position in the plane orthogonal to the optical axis. Then, there is a possibility that the retracting drive mechanism becomes large and complicated, and it takes time for adjustment. Even if the movement is not for anti-vibration, if the optical axis position of the retracting optical element is adjusted at the time of manufacture (for example, adjusting the axial position of the rotating member that holds the retracting optical element), the retracting optical element is retained. Since the relative position of the member and the cam mechanism changes, the same countermeasure is required. In addition, when the retracting optical element is held on a holding member that can be moved or adjusted in the plane perpendicular to the optical axis, a retracting drive mechanism having a compact structure can be configured while avoiding interference with the holding member. was difficult.

  The present invention has been made in view of the above problems, and provides a position control device for a retracting optical element capable of performing a retracting movement of the retracting optical element with high driving efficiency and high accuracy with a compact configuration. For the purpose.

  The retracting optical element position control device of the present invention drives the detachment driving member by the moving force of the advancing and retreating ring that can move in the optical axis direction of the photographing optical system, and the retracting optical element holding member via the detachment driving member, It has a basic structure in which the retracting optical element is moved from the insertion position where the retracting optical element is positioned on the optical axis of the photographing optical system. The retractable optical element holding member is supported so as to be rotatable between an insertion position and a removal position about a rotation axis substantially parallel to the optical axis of the imaging optical system in the forward / backward ring. Is held in the insertion position. The detachment drive member is supported by an advance and retreat ring so as to be rotatable about a rotation axis substantially parallel to the optical axis of the photographing optical system, and is allowed to be inserted without contacting the retracting optical element holding member at the insertion position. The position is rotated to a forcible removal position that contacts the retracting optical element holding member and presses and rotates from the insertion position to the removal position. The position of the detachment drive member is controlled by the insertion / removal control means and is held at the insertion allowable position in the photographing state. When the advancing / retreating ring moves from the photographing state position to the retracted position in the optical axis direction, It is turned to the detachment forced position. Then, the rotation axes of the retracting optical element holding member and the detaching drive member are positioned so that the detaching drive member has a larger turning radius to the contact position than the retracting optical element holding member. It is characterized by that.

  In the retracting optical element position control device of the present invention, the distance from the optical axis of the photographing optical system to the rotational axis of the detachment drive member is further determined from the optical axis of the photographing optical system to the rotational axis of the retracting optical element holding member. It is preferable to make it larger than the distance.

  As an insertion / removal control means for controlling the position of the separation drive member, an urging member that rotates and urges the separation drive member to the insertion allowable position, and is separated in the optical axis direction with respect to the separation drive member in a photographing state. When moving from the photographing state position to the retracted state position, it is preferable to provide a pressing member that contacts the detachment driving member and presses and rotates in the direction of the detachment forced position against the urging force of the urging member.

The present invention provides a position adjustment mechanism that allows the retractable optical element holding member to be position-adjusted along a plane perpendicular to the optical axis with respect to the advance / retreat ring separately from the rotation between the insertion position and the removal position. It is suitable for the configuration provided. In this case, a clearance is provided between the retracting optical element holding member and the detachment driving member so as not to contact each other depending on a change in the position of the retracting optical element holding member by the position adjusting mechanism in the photographing state.

  As a specific example of the position adjustment mechanism, an anti-vibration moving member that is supported so as to be movable along a plane orthogonal to the optical axis with respect to forward and backward movement, and an anti-vibration moving member that drives according to the shake applied to the photographing optical system are driven. Therefore, the present invention can be applied to an image stabilization mechanism provided with an image stabilization drive unit that suppresses image blur on the image plane. In this case, the retracting optical element holding member is pivotally supported on the vibration-proof moving member.

  According to the present invention, the retracting optical element holding member is rotated to the disengagement position by the disengagement driving member which is a rotating member supported by the advance and retreat ring separately from the retracting optical element retaining member. The moving force of the forward / backward ring can be converted into the rotational movement of the detachment driving member without being affected by the position change of the movement, and a highly accurate and reliable retraction operation can be performed. Then, the rotation axis position is set so that the rotation radius to the contact point where the detachment driving member presses the retracting optical element holding member is larger than the detachment driving member than the retracting optical element holding member. Thus, the amount of rotation of the retracting optical element holding member relative to the amount of rotation of the detachment driving member can be increased, and the retracting movement of the retracting optical element can be performed with high driving efficiency with a compact configuration.

It is the disassembled perspective view which looked at the anti-vibration lens block to which this invention was applied from back. It is the perspective view which looked at the anti-vibration lens block of the state which removed the sensor holder and the rectilinear moving ring from back. It is the perspective view which looked at the anti-vibration lens block and the separation | desorption press protrusion in the middle of the accommodation operation | movement of a lens-barrel from the back. It is a perspective view which shows the relationship between the insertion / removal frame in the imaging | photography state, and the separation drive lever. It is the perspective view which showed the insertion / removal frame in the imaging | photography state, and the separation drive lever from another angle. It is the figure which looked at the principal part of the vibration-proof lens block in a photographing state from the image plane side. It is the figure which extracted and showed the part and coil which are driven at the time of shake correction from FIG. It is the figure which highlighted and showed the component of the vibration proof drive actuator from FIG. It is the figure which looked at the principal part of the anti-vibration lens block in the accommodation state from the image plane side. It is the figure which extracted and showed the part and coil which are driven at the time of shake correction from FIG. It is the figure which emphasized and showed the component of the vibration proof drive actuator from FIG. It is the figure which looked at the anti-vibration lens block in the imaging | photography state from the image surface side except the rectilinear advance / retraction ring and the sensor holder. It is sectional drawing which follows the Z1-Z1 line | wire of FIG. It is sectional drawing which follows the Z2-Z2 line | wire of FIG. It is a block diagram which shows the electrical component of the camera relevant to a vibration proof lens block.

  An anti-vibration lens block 10 shown in FIGS. 1 to 3 constitutes a lens barrel mounted on a camera, and an anti-vibration insertion / removal lens (retractable optical element) 12 that constitutes a part of a photographing optical system is provided inside. I support it. As shown in FIG. 1, an anti-vibration lens block 10 includes a shutter unit 16, an anti-vibration frame (position adjusting mechanism, anti-vibration moving member) 18, an insertion / removal frame (retraction optical element) in a linear movement ring (advance / retraction ring) 14. The structure includes a holding member 20, a sensor holder 22, a detachment drive lever (detachment drive member) 24, an anti-vibration drive actuator (position adjustment mechanism, anti-vibration drive means) 26, and the like.

  Although the entire structure of the lens barrel provided with the anti-vibration lens block 10 is not shown, the rectilinear moving ring 14 can move linearly in the lens barrel in the direction along the photographic optical axis O of the photographic optical system. The lens barrel is moved from the object side to the image plane side by the driving force of the lens barrel drive motor 61 (FIG. 15) when the lens barrel is changed from the photographing state to the retracted state. In the following description, in the direction along the photographing optical axis O, the subject side is referred to as the front, and the image plane side is referred to as the rear. A known cam mechanism or the like can be applied as a mechanism for moving the rectilinear moving ring 14 in the optical axis direction.

  The rectilinear moving ring 14 has a cylindrical portion 14a surrounding the photographing optical axis O, and a shutter unit 16 is fixed inside thereof. The shutter unit 16 has a photographing opening 16b (FIG. 1) penetrating in the optical axis direction at the center of a shutter housing 16a containing a shutter (not shown), and opens and closes the photographing opening 16b by driving the shutter with a built-in shutter actuator. Let The outer peripheral portion of the shutter housing 16a is provided with three spring hooking projections 16c (only one is shown in FIGS. 1 and 2) at different positions in the circumferential direction, and on the rear surface of the shutter housing 16a, Two movement restricting projections 16d and three ball support holes 16e are formed. The ball support hole 16e is a bottomed concave portion opened rearward (see FIG. 13).

  A vibration isolating frame 18 is supported at the rear part of the shutter unit 16. As shown in FIG. 13, the vibration isolating frame 18 has a ball contact surface 18a formed on the front side facing the shutter unit 16, and a guide ball between the ball contact surface 18a and the bottom surface of the ball support hole 16e. 28 is sandwiched. As described above, the shutter unit 16 has three ball support holes 16e, and the ball contact surface 18a and three guide balls 28 are also provided correspondingly (three locations). The ball contact surface 18a is a smooth flat surface that is substantially orthogonal to the photographing optical axis O. The guide ball 28 is loosely fitted in the ball support hole 16e in the direction orthogonal to the optical axis, and the guide ball 28 does not contact the inner wall of the ball support hole 16e when positioned near the center of the ball support hole 16e. .

  Three spring hooking protrusions 18b are provided on the outer peripheral portion of the vibration isolating frame 18 at different positions in the circumferential direction, and a tension spring is provided between each spring hooking protrusion 18b and three spring hooking protrusions 16c provided on the shutter unit 16. 30 is stretched. The anti-vibration frame 18 is urged in the direction (front) approaching the shutter unit 16 by the urging force of the three tension springs 30, and the ball contact surface 18 a is brought into contact with the guide ball 28, thereby Forward movement is restricted. In this state, the three ball contact surfaces 18a are in point contact with the three guide balls 28, respectively, and by sliding the point contact portions (or the guide balls 28 inside the ball support holes 16e). The anti-vibration frame 18 can freely move in a direction perpendicular to the photographing optical axis O while the guide ball 28 rolls when not in contact with the wall.

  The anti-vibration frame 18 is also formed with two movement restriction holes 18c into which two movement restriction projections 16d provided on the shutter unit 16 are inserted. As shown in FIGS. 6 to 12, each movement limiting hole 18 c has a rectangular inner surface shape that is substantially square in a plane orthogonal to the photographing optical axis O. Hereinafter, one diagonal direction of the inner wall of each movement limiting hole 18c in the optical axis orthogonal plane is referred to as an X axis, and the other diagonal direction is referred to as a Y axis. The anti-vibration frame 18 is freely movable with respect to the shutter unit 16 (straight forward moving ring 14) in a plane perpendicular to the photographing optical axis O until the movement restriction projection 16d comes into contact with the inner surface of the movement restriction hole 18c. Can move.

  The anti-vibration frame 18 is driven by an anti-vibration drive actuator 26. The anti-vibration drive actuator 26 is an electromagnetic actuator having two coils 31 and 32 supported on the shutter unit 16 side and two permanent magnets 34 and 36 supported on the anti-vibration frame 18 side. The permanent magnet 34 and the permanent magnet 36 are respectively fixed to magnet holding portions 18 d and 18 e provided on the vibration isolation frame 18. The shapes and sizes of the permanent magnet 34 and the permanent magnet 36 are substantially the same, are each formed into an elongated rectangular thin plate shape, and are symmetrical with respect to a virtual plane P (FIGS. 6 to 12) passing through the photographing optical axis O and along the Y axis. Arranged in relation to More specifically, each of the permanent magnet 34 and the permanent magnet 36 has N as one of the half regions divided by the magnetic pole boundary lines M1 and M2 (FIGS. 8 and 11) passing through the approximate center of the short side direction and facing the long side. The magnetic pole boundary line M1 of the permanent magnet 34 and the magnetic pole boundary line M2 of the permanent magnet 36 are above from the lower side in the Y-axis direction (the insertion position side of the insertion / removal frame 20 described later). Inclination is made so as to be separated from each other as it goes toward the separation position side of the insertion / removal frame 20 described later. The inclination angle of the magnetic pole boundary line M1 of the permanent magnet 34 and the magnetic pole boundary line M2 of the permanent magnet 36 with respect to the virtual plane P is set to about 45 degrees in the forward and reverse directions. That is, the permanent magnet 34 and the permanent magnet 36 have a relationship in which their longitudinal directions (magnetic pole boundary lines M1, M2) are substantially orthogonal.

  As shown in FIGS. 1, 8 and 11, the coils 31 and 32 are air-core coils having a pair of substantially parallel long side portions and a pair of curved portions connecting the long side portions. The size is substantially the same. A pair of positioning protrusions 16f and 16g project from the rear surface of the shutter housing 16a (FIG. 1), and the coil 31 is supported by the shutter unit 16 in such a manner that the pair of positioning protrusions 16f are engaged with the air core. The coil 32 is supported by the shutter unit 16 in such a manner that the pair of positioning protrusions 16g are engaged with the air core portion. In this supported state, the major axis direction of the coil 31 is substantially parallel to the magnetic pole boundary line M1 of the permanent magnet 34, and the major axis direction of the coil 32 is substantially parallel to the magnetic pole boundary line M2 of the permanent magnet 36. The coil 31 and the coil 32 are connected to a flexible substrate (not shown) extending from the shutter unit 16, and further connected to a camera control substrate via another flexible substrate in the lens barrel. The energization control of the coils 31 and 32 is performed by the control circuit 60 (FIG. 15).

  In the anti-vibration drive actuator 26 having the above configuration, the coil 31 and the permanent magnet 34 face each other in the optical axis direction, and when the coil 31 is energized, the magnetic pole boundary line of the permanent magnet 34 in a plane orthogonal to the imaging optical axis O. A driving force in a direction substantially orthogonal to M1 (long axis direction line of the coil 31) acts. The acting direction of this driving force is F1 (FIGS. 8, 11 and 12). Further, as shown in FIG. 14, the coil 32 and the permanent magnet 36 are opposed to each other in the optical axis direction. When the coil 32 is energized, the magnetic pole boundary M2 (coil) of the permanent magnet 36 in a plane orthogonal to the photographing optical axis O is obtained. A driving force in a direction substantially orthogonal to (32 major axis direction lines) acts. The direction of action of this driving force is F2 (FIGS. 8, 11, and 12). The directions F1 and F2 of the driving force intersect with each other at an angle of about 45 degrees with respect to both the X axis and the Y axis. By controlling the energization of the coils 31 and 32, the imaging optical axis O and The anti-vibration frame 18 can be moved to an arbitrary position within an orthogonal plane. As described above, the movement range is restricted by the movement restriction hole 18c coming into contact with the inner surface of the movement restriction protrusion 16d.

  A sensor holder 22 is fixed to the shutter unit 16 in the rectilinear moving ring 14. The sensor holder 22 is located at the rear of the vibration isolation frame 18 and has a shape facing the magnet holding portions 18 d and 18 e, and is located behind the permanent magnet 36 and the position detection sensor 38 located behind the permanent magnet 34. The position detection sensor 40 is held. The position detection sensor 38 and the position detection sensor 40 are magnetic sensors (Hall sensors), which are connected to a flexible substrate (not shown) extending from the shutter unit 16 and further relayed through another flexible substrate in the lens barrel. It is connected to a control circuit 60 on the control board. When the permanent magnet 34 is displaced, the output of the position detection sensor 38 is changed. When the permanent magnet 36 is displaced, the output of the position detection sensor 40 is changed. The output changes of the two position detection sensors 38 and the position detection sensor 40 are prevented. The drive position of the vibration isolation frame 18 by the vibration drive actuator 26 can be detected by the control circuit 60.

  An insertion / removal frame 20 is supported on the vibration isolation frame 18 so as to be rotatable (swingable) about a rotation axis 42 parallel to the photographing optical axis O. Both ends of the rotation shaft 42 are fixed to a shaft support hole 18 f provided in the vibration isolation frame 18 and a retaining member 44 fixed to the vibration isolation frame 18. The insertion / removal frame 20 includes a lens holding cylinder portion 20a for holding the vibration-proof insertion / removal lens 12, a shaft hole portion 20b having a shaft hole through which the rotation shaft 42 is inserted, a lens holding cylinder portion 20a, and a shaft hole portion 20b. The arm part 20c to connect is provided. The insertion / removal frame 20 can swing between the insertion position shown in FIGS. 2 to 8 and 12 and the separation position shown in FIGS. 9 to 11, and a stopper (insertion holding) provided on the vibration isolation frame 18. Means) The insertion position is determined by bringing the stopper contact portion 20d provided on the lens holding cylinder portion 20a into contact with 18g. An insertion / removal frame biasing spring (insertion holding means) 46 composed of a torsion coil spring having one end and the other end locked to the vibration isolating frame 18 and the insertion / removal frame 20 biases the insertion / removal frame 20 toward the insertion position. doing. Further, the insertion / removal frame 20 is biased forward by an optical axis direction biasing spring 48 formed of a compression spring inserted between the shaft hole portion 20b and the retaining member 44, and the position in the optical axis direction is stabilized.

  When the insertion / removal frame 20 is in the insertion position, the vibration-proof insertion / removal lens 12 is positioned on the photographing optical axis O. When the insertion / removal frame 20 is rotated to the separation position, the center of the vibration-proof insertion / removal lens 12 is displaced in the Y-axis direction with respect to the photographing optical axis O. An escape hole 18h having a shape corresponding to the movement locus of the lens holding cylinder portion 20a at this time (an arcuate locus centering on the rotation shaft 42) is formed in the vibration isolation frame 18 so as to penetrate in the optical axis direction. The front end portion of the lens holding cylinder portion 20a enters the escape hole 18h. The escape hole 18h penetrates (opens) the outer peripheral portion of the vibration isolation frame 18, and a bridge portion 18i that reinforces the opening portion of the escape hole 18h is provided. The bridging portion 18i is formed so as to be offset rearward so that it does not interfere with the lens holding cylinder portion 20a when the insertion / removal frame 20 is rotated to the removal position. The anti-vibration frame 18 can move in the direction of the detachment position in conjunction with the insertion / removal frame 20, and the end on the insertion position side (the lower end in FIGS. 6 to 12) of the inner surface of the movement restriction hole 18 c. The movement is restricted at one moving end in the Y-axis direction with which the movement restricting protrusion 16d is brought into contact with (Fig. 9). This movement restriction position of the vibration isolation frame 18 is referred to as a separation assist position.

  A detachment drive lever 24 is supported in the rectilinear moving ring 14 so as to be rotatable (swingable) about a rotation axis 50 parallel to the photographing optical axis O. The rotation shaft 50 is located in the vicinity of the rotation shaft 42 and is formed integrally with the rectilinear movement ring 14 (see FIG. 1), and is inserted into a shaft hole formed in the shaft hole portion 24a of the detachment drive lever 24. Yes. A retaining plate 52 is fixed to the rear portion of the rectilinear moving ring 14 to restrict the rearward movement of the separation drive lever 24. The detachment drive lever 24 has a detachment pressing portion 24c near the tip of an arm 24b extending in the outer diameter direction from the shaft hole portion 24a. The detachment pressing portion 24c is provided on the arm portion 20c of the insertion / removal frame 20. It is possible to contact the pressed part 20e. A contact point of the detachment pressing portion 24c with the pressed portion 20e is shown as an action point T in FIGS. Here, although referred to as an action point, the opposing region of the pressed portion 20e and the separation pressing portion 24c has a certain length in the optical axis direction, and actually the pressed portion 20e and the separation pressing portion. 24 c contacts in a linear region parallel to the photographing optical axis O. The aforementioned urging force of the insertion / removal frame urging spring 46 urges the insertion / removal frame 20 from the disengagement position to the insertion position direction (counterclockwise in FIGS. 6 to 12). It is urged to rotate in the same direction (counterclockwise in FIGS. 6 to 12) by a detachment drive lever urging spring (insertion / removal control means, urging member) 54. In the rectilinear moving ring 14, a stopper is provided for determining the turning end of the detachment drive lever 24 in the urging direction by the detachment drive lever urging spring 54. On the other hand, the rotation of the insertion / removal frame 20 in the urging direction by the insertion / removal frame urging spring 46 is regulated by the contact between the stopper contact portion 20d and the stopper 18g. FIG. 6 shows a state where the insertion / removal frame 20 and the separation drive lever 24 are in contact with the respective stoppers. At this time, the pressed portion 20e and the separation pressing portion 24c are separated from each other without abutting at the action point T. (See FIGS. 4 and 5). The clearance between the pressed portion 20e and the separation pressing portion 24c is within the movable range of the vibration isolation frame 18 relative to the shutter unit 16 (the range until the movement restricting projection 16d contacts the inner surface of the movement restricting hole 18c). The size is set such that the pressing portion 20e is not brought into contact with the separation pressing portion 24c. In other words, the detachment drive lever 24 does not prevent the anti-vibration drive of the anti-vibration frame 18 and the insertion / removal frame 20 by the anti-vibration drive actuator 26. If no external force is applied to the insertion / removal frame 20 and the separation drive lever 24, the insertion / removal frame 20 is maintained at the insertion position by the biasing force of the insertion / removal frame biasing spring 46 as shown in FIGS. .

  The separation drive lever 24 includes a pressed portion 24d in the vicinity of the shaft hole portion 24a. In the lens barrel, a detachment pressing protrusion (insertion / removal control means, pressing member) 58 is fixed to be positioned behind the detachment drive lever 24, so that the rectilinear movement ring 14 moves backward when it is in the retracted state. Accordingly, the detachment pressing protrusion 58 comes into contact with the pressed portion 24d, and the detachment drive lever 24 is rotated from the insertion position toward the detachment position. More specifically, an end face cam 58a is formed at the tip of the separation pressing protrusion 58, and when the linear movement ring 14 moves backward and approaches the separation pressing protrusion 58, the pressed part 24d comes into contact with the end cam 58a. By this contact, the detachment drive lever 24 is rotated in the direction against the urging force of the detachment drive lever urging spring 54 (the direction of the detachment position of the insertion / removal frame 20) from the moving force of the rectilinear movement ring 14 rearward in the optical axis direction. A component force to be moved is generated, and after the separation driving lever 24 is rotated by the amount of the clearance described above, the separation pressing portion 24 c comes into contact with the pressed portion 20 e of the insertion / removal frame 20. Then, the pressing force in the direction of the detachment position is transmitted to the insertion / removal frame 20 via the detachment pressing portion 24c and the pressed portion 20e, and resists the urging forces of both the insertion urging spring 46 and the detachment drive lever urging spring 54. Then, the detachment drive lever 24 presses and rotates the insertion / removal frame 20 in the detachment direction. After the insertion / removal frame 20 reaches the separation position, a separation holding surface 58b substantially parallel to the photographing optical axis O provided on the side surface of the separation pressing protrusion 58 engages with the side surface of the pressed portion 24d, and the insertion / removal frame 20 is It is held at the disengaged position (FIG. 9).

  The electrical components of the camera related to the image stabilizing lens block 10 are conceptually shown in FIG. A control circuit 60 is provided in the camera to control the whole. The shake detection sensor 63 is a gyro sensor that detects a moving angular velocity of the camera around the X axis and the Y axis, and an output thereof is input to the control circuit 60. The control circuit 60 receives this shake signal, calculates the drive amount and drive direction of the image-proof insertion / removal lens 12 (anti-vibration frame 18) for canceling the image shake, and based on the calculation location. Energization control of the coil 31 and the coil 32 constituting the vibration drive actuator 26 is performed. Further, the displacement of the permanent magnets 34 and 36 accompanying the movement of the vibration isolating frame 18 is detected by the control circuit 60 via the position detection sensors 38 and 40. The control circuit 60 further drives the lens barrel drive motor 61 in accordance with the on / off state of the main switch 62 to switch the lens barrel between the photographing state and the retracted state.

  The operation of the anti-vibration lens block 10 having the above structure will be described. 6 to 8, the insertion / removal frame 20 is held at the insertion position by the urging force of the insertion / removal frame urging spring 46, and the center (optical axis) of the anti-vibration insertion / removal lens 12 is the photographic light. It coincides with the axis O. In the imaging state, the image stabilization lens 18 is driven in the plane orthogonal to the optical axis by the image stabilization drive actuator 26 in accordance with the direction and magnitude of the shake applied to the imaging optical system, so that the image stabilization optical insertion / removal lens 12 is moved to the imaging optical axis. It is possible to suppress the shift (image blurring) of the subject image on the imaging plane by shifting with respect to O. More specifically, the camera movement angular velocity is detected by the shake detection sensor 63, and the control circuit 60 obtains the movement angle by time-integrating the angular velocity of the shake, and the movement amount of the image on the imaging surface is determined from the movement angle. In addition to the calculation, the driving amount and driving direction of the anti-vibration insertion / removal lens 12 (anti-vibration frame 18) for canceling the image blur are calculated. The control circuit 60 performs energization control of the coil 31 and the coil 32 based on the calculated value. Then, the anti-vibration frame 18 is moved while the three ball contact surfaces 18a receive the support guidance with respect to the three guide balls 28. When the vibration isolation frame 18 moves, the permanent magnets 34 and 36 held by the vibration isolation frame 18 are displaced, and this displacement is detected by the position detection sensors 38 and 40 and feedback controlled. When the anti-vibration frame 18 is subjected to anti-vibration driving, the insertion / removal frame 20 is held at an insertion position where the stopper contact portion 20d is brought into contact with the stopper 18g, and the anti-vibration frame 18 and the insertion / removal frame 20 (anti-vibration) The insertion / removal lens 12) is moved together.

  In the photographing state, the position detection sensors 38 and 40 can be calibrated using the moving end position of the vibration isolating frame 18 by the contact between the movement restricting projection 16d and the inner surface of the movement restricting hole 18c. The direction of action F1 and F2 of the driving force of each pair of the coils 31 and 32 and the permanent magnets 34 and 36 constituting the anti-vibration driving actuator 26 intersects the X axis and the Y axis at a relationship of about 45 degrees, and movement limitation The moving end where the X-axis direction both ends of the movement restricting hole 18c abut against the protrusion 16d is set as the X-axis drive reference position of the anti-vibration drive actuator 26, and the Y of the movement restricting hole 18c with respect to the movement restricting protrusion 16d. A moving end where both end portions in the axial direction come into contact with each other can be set as a drive reference position for the Y axis. The practical vibration-proof drive range of the vibration-proof frame 18 in the photographing state is set in a range in which the movement restriction protrusion 16d does not contact the inner surface of the movement restriction hole 18c.

  When the main switch 62 is turned off, the transition from the shooting state to the storage state is performed under the control of the control circuit 60. Specifically, the anti-vibration lens block 10 (the rectilinear moving ring 14) is moved rearward in the optical axis direction by the lens barrel driving motor 61, and then the pressed portion 24d of the detachment driving lever 24 that is retracted together with the rectilinear moving ring 14 in due course. However, it contacts the end face cam 58a of the separation pressing projection 58. Then, the pressed portion 24d is pressed by the end face cam 58a, and a component force is generated from the backward movement force of the rectilinear moving ring 14, and the separation drive lever 24 rotates against the urging force of the detachment drive lever urging spring 54. Then, the separation pressing portion 24c comes into contact with the pressed portion 20e. As described above, an urging force toward the insertion position is applied to the insertion / removal frame 20 by the insertion / removal frame urging spring 46, and the detachment drive lever 24 with which the detachment pressing portion 24c abuts the pressed portion 20e is provided. Then, the insertion / removal frame urging spring 46 is pressed against the urging force of the insertion / removal frame urging spring 46 from the insertion position toward the separation position. In addition, an urging force in a direction of pressing the ball contact surface 18 a against the guide ball 28 by the three tension springs 30 acts on the vibration isolation frame 18 that supports the insertion / removal frame 20. That is, movement resistance due to the urging force of the insertion / removal frame urging spring 46 and the tension spring 30 acts on the insertion / removal frame 20 and the vibration isolation frame 18, respectively. Here, the rotational resistance of the insertion / removal frame 20 provided by the insertion / removal frame biasing spring 46 is set larger than the movement resistance of the vibration isolation frame 18 provided by the tension spring 30. Therefore, the pressing force acting on the insertion / removal frame 20 is transmitted to the vibration isolation frame 18, and the vibration isolation frame 18 together with the insertion / removal frame 20 before the rotation of the insertion / removal frame 20 in the direction of the separation position is started. It is moved toward the separation position. Then, the anti-vibration frame 18 is moved to the separation assist position (FIGS. 9 to 11) where the Y-axis direction end portion (end portion on the insertion position side) of the movement restriction hole 18c contacts the movement restriction protrusion 16d. . As described above, the practical anti-vibration driving range of the anti-vibration frame 18 in the shooting state does not include a place where the inner surface of the movement restriction hole 18c contacts the movement restriction protrusion 16d. It is located outside the vibration drive range. When the vibration isolating frame 18 reaches the separation assist position and further movement is restricted, the insertion / removal frame 20 is independently rotated from the insertion position to the separation position. That is, the separation movement of the anti-vibration insertion / removal lens 12 is performed as a combined movement of the movement of the anti-vibration frame 18 to the separation auxiliary position in the Y-axis direction and the rotation of the insertion / removal frame 20 to the separation position.

  By the movement of the anti-vibration frame 18 to the separation assisting position and the rotation of the insertion / removal frame 20 to the separation position, the anti-vibration insertion / removal lens 12 moves from the optical path (photographing optical axis O) as shown in FIGS. Will be withdrawn. When the rectilinear moving ring 14 continues to move backward, the separation holding surface 58b of the separation pressing protrusion 58 comes into contact with the pressed portion 24d (FIG. 9), and the insertion / removal frame 20 and the separation drive lever 24 are brought together. The release pressing projection 58 holds the release position and restricts the rotation to the insertion position. Although not shown, when the lens barrel reaches the retracted state, a rear member (for example, in the shooting state, is prevented in the space in the straight moving ring 14 vacated by detachment of the vibration-proof insertion / removal lens 12 (lens holding cylinder portion 20a). Another optical element positioned behind the transfer / removal lens 12 enters. Thereby, the optical axis direction size at the time of accommodation can be made smaller than a lens barrel of a type in which a plurality of optical elements are accommodated in series on the optical axis.

  When the main switch 62 is turned on in the housed state, the control circuit 60 controls the transition from the housed state to the shooting state. When shifting from the retracted state to the photographing state, the control circuit 60 drives the lens barrel drive motor 61 in the extending direction so that the rectilinear movement ring 14 is moved forward and the pressing of the separation driving lever 24 by the separation pressing protrusion 58 is released. Then, the detachment drive lever 24 returns to the position shown in FIG. 6 by the urging force of the detachment drive lever urging spring 54. Then, the insertion / removal frame 20 is rotated from the removal position to the insertion position by the biasing force of the insertion / removal frame biasing spring 46. Along with this, the holding of the anti-vibration frame 18 at the separation assist position is also released, and the anti-vibration frame 18 can be driven by the anti-vibration drive actuator 26. Then, the above-described position detection sensors 38 and 40 are calibrated when the photographing state is entered.

  In the anti-vibration lens block 10 described above, the detachment drive lever 24 is pivotally supported on the rectilinear movement ring 14 separately from the insertion / removal frame 20 for holding the anti-vibration insertion / removal lens 12. The detachment drive lever 24 is pressed by the detachment pressing protrusion 58 to move to the detachment forced position, and the insertion / removal frame 20 is pressed and moved to the detachment position via the detachment drive lever 24. The detachment drive lever 24 is pivotally supported by a rotation shaft 50 parallel to the rotation shaft 42 of the insertion / removal frame 20 and is rotated along a plane orthogonal to the photographing optical axis O. The part where the load in the optical axis direction is transmitted under pressure is up to the separation drive lever 24, and the load in the optical axis direction does not act on the insertion / removal frame 20 and the vibration isolation frame 18. As described above, the detachment pressing portion 24c and the pressed portion 20e are formed as surfaces having a shape that does not transmit a force in a direction parallel to the photographing optical axis O. Even if the drive lever 24 moves a little in the direction along the axis of the rotation shaft 50, the insertion / removal frame 20 is not pressed in the direction along the axis of the rotation shaft 42. As a result, the load on the support mechanism for the insertion / removal frame 20 and the vibration isolation frame 18 is reduced, and high-accuracy driving of the vibration isolation insertion / removal lens 12 is ensured.

  Further, unlike the insertion / removal frame 20 that changes the position of the rotation shaft 42 according to the movement of the vibration isolation frame 18, the separation drive lever 24 that is pressed by the separation pressing protrusion 58 rotates in the rectilinear movement ring 14. Since the position of the moving shaft 50 is not changed, the positional relationship with the separation pressing projection 58 can be kept constant without being affected by the position change of the vibration isolation frame 18 and the insertion / removal frame 20. Accordingly, the relative position of the pressed portion 24d of the separation drive lever 24 and the end face cam 58a of the separation pressing protrusion 58 is not displaced, and the separation drive lever 24 can be driven with high accuracy. The contact portion (action point T) between the separation drive lever 24 and the insertion / removal frame 20 is a planar separation pressing portion 24c facing the rotation radius direction of the separation drive lever 24 and a projection on the cylindrical outer surface. Since it is set on the pressed portion 20e, even if the position of the insertion / removal frame 20 changes due to the vibration isolation movement of the vibration isolation frame 18, the release drive lever 24 is rotated from the insertion allowable position to the forcible release position. The detachment pressing portion 24c can be reliably brought into contact with the pressed portion 20e, and the insertion / removal frame 20 can be rotated to the detachment position.

  As shown in FIGS. 6 to 12, the rotation shaft 42 of the insertion / removal frame 20 and the rotation shaft 50 of the detachment drive lever 24 are set in four quadrants Q1 set in the optical axis orthogonal plane with the photographing optical axis O as the center. Q2, Q3, and Q4 are located in a common quadrant Q1, and the rotation shaft 50 is located outside the rotation shaft 42 in the radial direction with the photographing optical axis O as the center. That is, the radial distance A from the photographing optical axis O to the center of the rotation shaft 42 (the rotation center of the insertion / removal frame 20) K1, and the center of the rotation shaft 50 from the photographing optical axis O (the rotation of the separation drive lever 24). The radial distance B to the moving center K2 has a relationship of A <B. 9 to 11, when the insertion / removal drive lever 24 is used to press and rotate the insertion / removal frame 20 to the separation position, the separation pressing portion 24c on the separation drive lever 24 side and the pressed portion on the insertion / removal frame 20 side are pressed. The contact point of the portion 20e is the action point T. The distance (turning radius) from the center K1 of the turning shaft 42 of the insertion / removal frame 20 to the action point T is C, and the turning shaft 50 of the separation drive lever 24 is set. When the distance (rotation radius) from the center K2 to the action point T is D, the relationship is C <D. That is, the detachment drive lever 24 is positioned on the outer diameter side farther from the photographing optical axis O than the insertion / removal frame 20 (A <B), and the turning radius to the action point T is larger. (C <D).

  Note that the position of the rotation shaft 42 of the insertion / removal frame 20 in the photographing state varies depending on the drive position of the vibration isolation frame 18 by the vibration isolation drive actuator 26, but the inner surface of the movement restriction hole 18c and the restriction protrusion 16d. The positions of the rotation shaft 42 and the rotation shaft 50 are so maintained that the relationship of A <B and C <D is always maintained within the movable range of the vibration isolation frame 18 (insertion / removal frame 20) regulated by the contact. Is set. For example, FIGS. 6 to 8 show a state in which the movement restricting projection 16d is positioned substantially at the center of the movement restricting hole 18c, and FIGS. 9 to 11 show one end of the movement restricting hole 18c in the Y-axis direction at the movement restricting projection 16d. The anti-vibration frame 18 is moved to the disengagement assist position to be brought into contact with A, but the relationship of A <B is established in any state. Further, within the movable range of the vibration isolating frame 18 (insertion / removal frame 20), the relationship of C <D is always maintained at positions other than the separation assist position shown in FIGS.

  According to the above configuration, the positional relationship between the rotation center K1 of the insertion / removal frame 20 and the rotation center K2 of the separation drive lever 24 with respect to the action point T of the pressing force from the separation drive lever 24 to the insertion / removal frame 20, that is, insertion / removal. By satisfying C <D with respect to the turning radius of the frame 20 and the detachment drive lever 24, it is compared with the case of C = D (the insertion / removal frame 20 and the detachment drive lever 24 are rotated substantially coaxially) and C> D. Thus, the amount of rotation of the insertion / removal frame 20 per unit rotation angle of the separation drive lever 24 in the direction of the separation position can be increased. That is, the insertion / removal frame 20 can be rotated to the separation position with a small amount of rotation of the separation drive lever 24. The amount of rotation of the separation drive lever 24 is determined according to the amount of movement of the rectilinear movement ring 14 in the optical axis direction when the photographing state is changed to the retracted state, the shape (tilt angle) of the end face cam 58a of the separation pressing protrusion 58, and the like. If the separation movement amount of the insertion / removal frame 20 per unit rotation angle is large, the insertion / removal frame 20 can be efficiently driven to the separation position with a small movement amount of the rectilinear movement ring 14, and the driving efficiency is excellent. A position control device can be obtained.

  Further, by satisfying A <B with respect to the arrangement relationship between the rotation center K1 of the insertion / removal frame 20 and the rotation center K2 of the detachment drive lever 24 with respect to the photographic optical axis O, compared to the case of A = B or A> B. Thus, the position of the separation drive lever 24 is set to the outside in the radial direction. In addition to the insertion / removal frame 20, elements such as the vibration isolation frame 18 and the vibration isolation drive actuator 26 are densely arranged in the rectilinear movement ring 14, and a release drive lever 24 is located inside the insertion / removal frame 20. It is difficult to obtain a space for providing a detachable driving member. By setting A <B here, it is possible to provide the separation drive lever 24 at a position where it does not interfere with the vibration isolation frame 18 or the vibration isolation drive actuator 26 while satisfying the above relationship of C <D. . In addition, not only satisfying A <B, but as shown in FIGS. 1 to 3, it is preferable from the viewpoint of space efficiency to provide the rotation shaft 50 in the vicinity of the inner peripheral surface that is the inner side of the rectilinear moving ring 14. . If the position of the rotation shaft 50 is set so as to protrude outward from the peripheral surface of the rectilinear moving ring 14, the entire vibration-proof lens block 10 may be increased in diameter while preventing an increase in diameter. As an optimal arrangement excellent in space efficiency, the position of the rotation shaft 50 may be set in the vicinity of the inner peripheral surface of the rectilinear moving ring 14.

  As mentioned above, although demonstrated based on illustration embodiment, this invention is not limited to this. In the present invention, the member that converts the moving force in the optical axis direction of the forward / backward ring (straight forward moving ring 14) into the pressing force in the direction of the detachment position of the retracting optical element holding member (insertion / removal frame 20) is an axis for the forward / backward ring. Since the detachment drive member (detachment drive lever 24) does not change the support position (the rotation shaft 50), even if the position of the retracting optical element holding member (insertion / removal frame 20) in the plane orthogonal to the optical axis is slightly displaced. The retreat movement can be ensured. Therefore, it is suitable for a case where a mechanism for adjusting the position of the retracting optical element in the plane orthogonal to the optical axis is provided for an application different from the insertion / removal operation. In the illustrated embodiment, the position adjustment in the plane orthogonal to the optical axis is a drive for image blur correction, and the insertion / removal frame 20 is attached to the optical axis orthogonal plane along with the vibration isolation frame 18 by the driving force of the vibration isolation drive actuator 26. Moved within. However, not only such movement for image blur correction but also a configuration (for example, a configuration described in Japanese Patent Application Laid-Open No. 2004-233922) provided with an axial position adjusting mechanism for the rotation shaft 42 of the insertion / removal frame 20. However, the present invention is effective. When the position of the rotary shaft 42 is adjusted during assembly or the like, the relative position between the detachment pressing protrusion 58 and the insertion / removal frame 20 changes. However, the insertion / removal frame 20 is provided by interposing the detachment drive lever 24 therebetween. The effect similar to that of the illustrated embodiment can be obtained in that the moving force in the optical axis direction of the rectilinear moving ring 14 can be converted and reliably transmitted to the insertion / removal frame 20 without being affected by the change in the axial position.

  In the illustrated embodiment, when receiving a pressing force from the separation drive lever 24 during the lens barrel retracting operation, the vibration isolating frame 18 first moves to the separation assisting position, and then the insertion / removal frame 20 alone is the separation position. However, this operation order can be reversed. Specifically, the movement resistance of the vibration isolation frame 18 provided by the tension spring 30 is set larger than the rotational resistance of the insertion / removal frame 20 provided by the insertion / removal frame biasing spring 46, and the insertion / removal frame 20 A stopper is provided on the anti-vibration frame 18 to determine the rotation end to the separation position. In this aspect, when the pressing force by the detachment drive lever 24 is applied, the vibration isolation frame 18 and the insertion / removal frame 20 together with the insertion / removal frame 20 after the insertion / removal frame 20 is first rotated to the separation position and restricted by the stopper. It is moved to the withdrawal assist position. Therefore, the position of the force application point T (the contact portion between the pressed portion 20e and the detachment pressing portion 24c) when the insertion drive frame 24 is pressed and rotated to the detachment position by the detachment drive lever 24 is as shown in FIGS. However, as described above, even if the position of the insertion / removal frame 20 changes within the movable range of the vibration isolation frame 18, the insertion / removal frame 20 is maintained so that the relationship of A <B and C <D is maintained. Since the positions of the rotation shaft 42 and the rotation shaft 50 of the detachment drive lever 24 are set, the above-described effects can be obtained.

10 Anti-Vibration Lens Block 12 Anti-Vibration Insertion / Removal Lens (Retraction Optical Element)
14 Straight moving ring (advancing and retreating ring)
16 Shutter unit 18 Anti-vibration frame (position adjustment mechanism, anti-vibration moving member)
18g stopper (insertion holding means)
20 Insertion / removal frame (retractable optical element holding member)
20d Stopper contact portion 20e Pressed portion 22 Sensor holder 24 Detachment drive lever (detachment drive member)
24c Detachment pressing portion 24d Pressed portion 26 Anti-vibration driving actuator (position adjusting mechanism, anti-vibration driving means)
28 Guide ball 30 Tension spring 31 32 Coil 34 36 Permanent magnet 38 40 Position detection sensor 42 Rotating shaft 44 Detaching member 46 Insertion / removal frame biasing spring (insertion holding means)
50 Rotating shaft 54 Release drive lever biasing spring (insertion / removal control means, biasing member)
58 Detachment pressing protrusion (insertion / removal control means, pressing member)
58a End face cam 58b Detachment holding surface 60 Control circuit 61 Lens barrel drive motor 62 Main switch 63 Shake detection sensor O Shooting optical axis

Claims (6)

Advancing and retracting ring that is movable in the optical axis direction of the photographic optical system and is moved to a different position in the optical axis direction in an imaging state and a storage state in which no imaging is performed;
A retracting optical element is held, and is supported so as to be rotatable around a rotation axis substantially parallel to the optical axis of the photographing optical system within the forward and backward rings, and the retracting optical element is disposed on the optical axis of the photographing optical system. An insertion position to be positioned, and a retracting optical element holding member rotated to a disengaging position for disengaging the retracting optical element from the optical axis;
Insertion holding means for holding the retracting optical element holding member in the insertion position in the photographing state;
An insertion allowable position that is supported by the advance / retreat ring so as to be rotatable about a rotation axis substantially parallel to the optical axis of the imaging optical system, and that does not contact the retracting optical element holding member at the insertion position; A detachment drive member that contacts the retracting optical element holding member and rotates to a detachment forcing position that presses and rotates from the insertion position to the detachment position; and holds the detachment drive member at the insertion allowable position in the photographing state. An insertion / removal control means for rotating the separation driving member from the insertion allowable position to the separation forcing position when the forward / backward movement moves in the optical axis direction from the position in the photographing state to the position in the retracted state;
With
The pivot shafts of the retracting optical element holding member and the detaching drive member are set so that the pivoting radius of the detachable driving member to the contact portion of each other is larger than that of the retracting optical element holding member. A position control device for a retractable optical element, wherein the position control device is positioned. 2. The position control device for a retracting optical element according to claim 1, wherein a distance from an optical axis of the photographing optical system to a rotation axis of the separation driving member is set such that the distance from the optical axis of the photographing optical system to the retracting optical element holding member. A position control device for the retractable optical element that is larger than the distance to the rotation axis. 3. The retractable optical element position control device according to claim 1, wherein the insertion / removal control means includes:
An urging member for urging and urging the separation drive member to the insertion allowable position;
When the imaging device is separated from the separation driving member in the optical axis direction and the forward / backward movement moves from the photographing state position to the retracted state position, the separation driving member abuts against the separation driving member. A pressing member that rotates against the biasing force in the direction of the forcible separation position;
A retracting optical element position control device comprising: 4. The retractable optical element position control device according to claim 1, wherein the retractable optical element holding member is moved with respect to the forward and backward movement separately from the rotation between the insertion position and the disengagement position. A position control device for a retracting optical element, comprising a position adjustment mechanism that enables position adjustment along a plane orthogonal to the optical axis. 5. The position control device for a retractable optical element according to claim 4, wherein the position adjustment mechanism includes:
An anti-vibration moving member supported so as to be movable along a plane perpendicular to the optical axis with respect to the forward and backward ring;
Anti-vibration driving means for controlling the image shake on the image plane by driving the anti-vibration moving member according to the shake applied to the photographing optical system;
And a retracting optical element position control device in which the retracting optical element holding member is pivotally supported on the anti-vibration moving member. 6. The position control device for a retracting optical element according to claim 4 or 5, wherein a position change of the retracting optical element holding member by the position adjusting mechanism is performed between the retracting optical element holding member and the separation driving member in the photographing state. Is a position control device for the retractable optical element provided with a clearance that does not contact each other.

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