JP2013156292A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device capable of reliably supplying a current to a coil for a long period of time and performing accurate image blur correction.SOLUTION: The lens drive device comprises: a base member 2; a movable member 10 being movable in a plane perpendicular to an optical axis C; a lens frame 16 being movable in the direction of the optical axis C; a flexible printed circuit board 40 for supplying a current to a coil 22b; and regulation means 15 for regulating the movement of the movable member 10. The flexible printed circuit board 40 has a flexible part 43 which extends from a fixed portion 41c fixed to the base member 2 at a portion in the vicinity of the regulation means 15. Since the amount of the deformation of the flexible part 43 is regulated in the vicinity of the regulation means 15, the breakage of a conductive pattern can be prevented. Furthermore, reactive force caused by the deformation of the flexible part 43 is reduced, and thus the reactive force hardly prevents the movement of the movable member 10. This enables accurate image blur correction.

Description

  The present invention relates to a lens driving device that corrects image blur by moving an imaging optical system in a direction orthogonal to an optical axis.

  Conventionally, there is JP, 2006-174588, A as a technique of such a field. The lens unit described in this publication includes an imaging lens arranged in a lens barrel, a correction lens for correcting image blur, a moving plate for holding the correction lens, and an optical axis. And an actuator that moves the moving plate in a plane orthogonal to each other, a fixed plate that supports the moving plate so as to be movable in a plane orthogonal to the optical axis, and a gyro for detecting vibration of the lens barrel. ing. This lens unit corrects image blur by supplying a current to the actuator based on the output signal of the gyro that has detected the vibration of the lens barrel and moving the correction lens.

  The actuator includes a driving coil provided on one of the fixed plate and the moving plate, and a driving magnet provided on the other of the fixed plate and the moving plate. A magnetic sensor for detecting the position of the driving magnet is arranged inside the winding of the driving coil, and a driving current controlled based on the output signal of the magnetic sensor is supplied to the driving coil. According to such a configuration, since the magnetic sensor is arranged inside the winding of the driving coil, the actuator can be downsized with a simple configuration.

JP 2006-174588 A

  In the lens unit described in Patent Document 1, when the driving coil is provided on the moving plate, a current is supplied to the driving coil via the fixed plate and the moving plate whose positions change relatively. There is a need. Conventionally, a flexible printed board may be used in order to ensure electrical continuity between a fixed plate and a moving plate whose positions change relatively.

  However, the flexible printed circuit board has a portion that repeats deformation in order to follow the movement of the moving frame, and the conductor pattern formed on the portion that repeatedly deforms may break. For this reason, there was a problem that current could not be supplied to the coil provided in the moving frame.

  Further, in a downsized actuator, the driving force generated by the actuator is reduced. For this reason, since the ratio of the reaction force resulting from the deformation of the flexible printed circuit board with respect to the driving force is increased, there is a possibility that the movement of the moving frame is hindered. Therefore, there is a problem that the moving frame cannot be moved with high accuracy and the accuracy of image blur correction is lowered.

  SUMMARY An advantage of some aspects of the invention is that it provides a lens driving device that can reliably supply current to a coil for a long period of time and can perform image blur correction with high accuracy.

  A lens driving device according to the present invention includes a base member, a movable member that is disposed on the base member and is movable in accordance with image shake in a plane orthogonal to the optical axis, and is attached to the movable member to A lens frame movable in the direction of the axis, a flexible printed circuit board that is electrically connected to a movable member or a coil provided on the lens frame, and supplies current to the coil, and moves in a direction perpendicular to the optical axis Restricting means for restricting the movement of the movable member in a plane orthogonal to the optical axis by two movement loci, a linear movement locus that rotates and a rotational movement locus that rotates about a point on the linear movement locus as a rotation center; The flexible printed circuit board has a flexible portion extending from a portion fixed to the base member in the vicinity of the regulating means, and the free end portion of the flexible portion is a movable member or a coil provided Fixed to the lens frame It is.

  According to the lens driving device described above, the restricting means causes the movable member to perform a linear motion in the direction of the linear movement locus and a rotational motion with the point on the linear movement locus as the rotation center. In the vicinity of the restricting means, since the moving distance of the movable member relative to the base member is small, the deformation amount of the flexible portion extending from the portion fixed to the base member is suppressed. When the deformation amount of the flexible portion is suppressed, the stress acting on the flexible portion is reduced, so that breakage of the conductor pattern in the flexible portion can be suppressed. Therefore, a current can be reliably supplied to the coil over a long period of time. Further, when the deformation amount of the flexible portion of the flexible printed circuit board is suppressed, the reaction force generated due to the deformation of the flexible portion is reduced, and it is difficult to prevent the movement of the movable member. Therefore, accurate image blur correction can be performed.

  The coil and the free end may be fixed to the movable member, respectively, and the flexible part may have a first deformable part that can be deformed in a direction orthogonal to the optical axis. Since the flexible portion has the first deformable portion that can be deformed in the direction orthogonal to the optical axis, it is difficult to prevent the movement of the movable member. Therefore, accurate image blur correction can be performed.

  The coil and the free end are each fixed to the lens frame, and the flexible part is a first deformable part that can be deformed in a direction perpendicular to the optical axis, and a first deformable part that can be deformed in the direction of the optical axis. You may have two deformation parts. Since the flexible portion has the first deformable portion that can be deformed in the direction orthogonal to the optical axis, it is difficult to prevent the movement of the movable member. Moreover, since the flexible part has the 2nd deformation | transformation part which can deform | transform in the direction of an optical axis, it becomes difficult to prevent the movement of a lens frame. Therefore, accurate image blur correction and focus adjustment can be performed.

  According to the present invention, it is possible to reliably supply a current to a coil over a long period of time and to perform accurate image blur correction.

1 is an exploded view showing a first embodiment of a lens driving device according to the present invention. FIG. 2 is a plan view of the lens driving device shown in FIG. 1. It is a top view of the base member of a lens drive device. It is a bottom view of the movable member of a lens drive device. It is a top view of the flexible printed circuit board utilized for a lens drive device. It is a perspective view of the movable member by which the flexible printed circuit board is arrange | positioned. It is a perspective view of a flexible printed circuit board. It is a perspective view of the movable member by which the flexible printed circuit board is arrange | positioned. It is a perspective view of a flexible printed circuit board. It is an exploded view showing a second embodiment of the lens driving device according to the present invention. It is a top view of the lens drive device shown by FIG. It is a top view of the base member of a lens drive device. It is a bottom view of the movable member of a lens drive device. It is a top view of the flexible printed circuit board utilized for a lens drive device. It is a perspective view of the movable member by which the flexible printed circuit board is arrange | positioned. It is a perspective view of a flexible printed circuit board.

  Hereinafter, a preferred embodiment of a lens driving device according to the present invention will be described in detail with reference to the drawings.

[First embodiment]
As shown in FIG. 1, a lens driving device 1 having a camera shake correction function includes a box-shaped base member 2 that houses a camera shake correction mechanism 3 and a focus adjustment mechanism 4, and the focus adjustment mechanism 4 is orthogonal to the optical axis C. A camera shake correction mechanism 3 that moves in a plane to correct camera shake, a lens (not shown), a focus adjustment mechanism 4 that moves the lens in the direction of the optical axis C, and a lid for closing the base member 2 And a member 5. The lens driving device 1 is used by being disposed in front of a CCD (Charge Coupled Device) image sensor or a CMOS (Complementary Metal Oxide Semiconductor) image sensor (not shown) which is an image sensor.

  The above-described base member 2 and the camera shake correction mechanism 3 constitute a camera shake correction device 30. The camera shake correction is an aspect of image shake correction for correcting image shake.

  The base member 2 is a rectangular parallelepiped box-shaped member having a rectangular opening 2 a centered on the optical axis C. Inside the base member 2, a support surface 2b extending perpendicular to the optical axis C is provided. The support surface 2b is provided with recesses 2c and 2g. The recess 2c is arranged around a circular opening 2d centered on the optical axis C. The recess 2g is adjacent to the opening 2d near the corner 2h. It arrange | positions between the corner | angular parts 2h (refer FIG. 3).

  The base member 2 has outer peripheral walls 2x, 2y, 2z, and 2w provided upright around the support surface 2b. The outer peripheral wall 2x is orthogonal to the outer peripheral wall 2y, and the outer peripheral wall 2y is connected to the outer peripheral wall 2x at the corner 2h.

  The camera shake correction mechanism 3 is for correcting camera shake by moving the focus adjustment mechanism 4 attached to the movable member 10 within a plane orthogonal to the optical axis C. The camera shake correction mechanism 3 includes a supporting unit 8 that forms a ball for supporting the movable member 10 having a frame shape, a movable member 10 to which the focus adjusting mechanism 4 is attached, and the movable member 10 in a direction orthogonal to the optical axis C. The movable member driving means 11 to be driven and the restricting means 15 (see FIG. 4) for restricting the movement of the movable member 10 in the base member 2 are provided.

  The support means 8 for movably supporting the movable member 10 in a plane orthogonal to the optical axis C includes three metal spherical bodies 9a, 9b, 9c. The spherical body 9a is disposed in the concave portion 2g of the base member 2, and the spherical bodies 9b and 9c are disposed in the concave portion 2c (see FIGS. 3 and 4).

  A movable member 10 for moving the focus adjustment mechanism 4 in a direction orthogonal to the optical axis C is housed inside the base member 2 while being supported by the support means 8. The movable member 10 has a circular opening 10a centered on the optical axis C. The movable member 10 has a bottom surface 10 c that faces the support surface 2 b of the base member 2.

  On the bottom surface 10c of the movable member 10, a recess 10d is provided at a position corresponding to the recess 2c of the base member 2 (see FIG. 4). The inner diameters of the recesses 2c and 10d are formed larger than the outer diameter of the spherical bodies 9b and 9c. For this reason, the spherical bodies 9b and 9c can roll within the range of the recessed part 2c.

  Holes 10y and 10z are provided at positions facing the movable member 10 across the optical axis C. The hole 10 y is provided in the corner 10 h of the movable member 10 corresponding to the corner 2 h of the base member 2. A shaft 18a extending in the direction of the optical axis C is inserted into the hole 10y, and a shaft 18b extending in the direction of the optical axis C is inserted into the hole 10z. A shaft 18 a fixed to the movable member 10 is inserted into a coil spring 18 d for pressurizing the lens frame 16 in the direction of the optical axis C. One end of the coil spring 18d is brought into contact with the movable member 10, and the other end of the coil spring 18d biases the lens frame 16 in the direction of the optical axis C.

  The movable member driving means 11 for driving the movable member 10 in a direction orthogonal to the optical axis C includes three actuators 12, 13, and 14. As shown in FIG. 4, the actuator 12 and a groove 10 b described later are disposed on the diagonal line L1. The actuator 12 and the groove 10b are provided to face each other across the intersection of the diagonal line L1 and the diagonal line L2. The actuator 12 applies a driving force F1 having a directional component along the diagonal line L1 to the movable member 10.

  Actuators 13 and 14 are arranged on another diagonal L2 orthogonal to the diagonal L1. The actuators 13 and 14 are provided to face each other with the optical axis C interposed therebetween. The actuators 13 and 14 apply a driving force F2 having a directional component along the diagonal L2 to the movable member 10.

  The actuators 12, 13, and 14 have the same configuration. Here, the configuration of the actuator 12 will be described as an example. As shown in FIG. 1, the actuator 12 includes a magnet 12a and a coil 12b. The magnet 12a is disposed in the recess 10r on the bottom surface 10c of the movable member 10 (see FIG. 4), and the coil 12b is disposed in the recess 2p formed on the support surface 2b of the base member 2 (see FIG. 3). The magnet 12a is disposed so as to face the coil 12b.

  As shown in FIGS. 3 and 4, the restricting means 15 for restricting the movement of the movable member 10 is constituted by a spherical body 9 a constituting the support means 8 and a groove 10 b provided in the movable member 10. ing. The spherical body 9 a is disposed between the recess 2 g provided on the support surface 2 b of the base member 2 and the groove 10 b provided on the bottom surface 10 c of the movable member 10.

  The groove 10 b is a long groove extending along the diagonal line L <b> 1 in the movable member 10. The groove 10b is provided on the bottom surface 10c at a position corresponding to the position of the recess 2g of the base member 2 where the spherical body 9a is disposed. The width in the direction orthogonal to the longitudinal direction of the groove 10b is set to a width that allows the spherical body 9a to slide relative to the side surface of the groove 10b.

  According to the regulation means 15 having such a configuration, the movable member 10 can be linearly moved while being guided in the direction of the linear movement locus T1 set in the direction in which the side wall 10t of the groove 10b extends. It can rotate along a rotational movement locus T2 having a spherical body 9a disposed on the movement locus T1 as a rotation center RC. That is, the position of the movable member 10 corresponds to being expressed in a circular coordinate system based on one moving radius and one deflection angle. According to this combination of linear movement and rotation, the position of the optical axis C can be accurately moved to a desired position.

  The movable range S of the optical axis C is based on a distance allowing linear movement and an angle allowing rotation. The distance at which the movable member 10 can move linearly and the angle at which the movable member 10 can rotate are determined by the gap between the inner wall surface 2s of the base member 2 and the outer peripheral surface 10s of the movable member 10 (see FIG. 2). . Note that the distance at which the movable member 10 can be linearly moved may be determined by the length of the groove 10b in the longitudinal direction. Further, the rotatable angle of the movable member 10 may be regulated by sandwiching the spherical bodies 9b and 9c between the wall surface of the recess 2c and the wall surface of the recess 10d in a direction orthogonal to the optical axis C.

  As shown in FIG. 1, the focus adjustment mechanism 4 attached to the movable member 10 includes a lens frame 16 that holds a lens (not shown), and a lens driving unit 19 that drives the lens frame 16 in the direction of the optical axis C. And.

  The lens frame 16 for holding a lens group (not shown) having a single lens or a plurality of lenses is a cylindrical member having a hole 16a into which the lens is fitted. The optical axis C is the optical axis of the lens disposed in the lens frame 16.

  A through hole 16 c through which the shaft 18 a fixed to the movable member 10 is inserted is formed in the protruding portion 16 e provided on the outer peripheral surface of the lens frame 16. A groove 16d into which the shaft 18b is inserted is formed in the protrusion 16b provided on the opposite side of the protrusion 16e across the optical axis C. Since the lens frame 16 is guided in the direction of the optical axis C by the shafts 18a and 18b, the focal point can be adjusted with high accuracy.

  As shown in FIGS. 1 and 2, the lens driving means 19 for driving the lens frame 16 in the direction of the optical axis C includes two actuators 22. Each actuator 22 is arranged on the plane orthogonal to the optical axis C with a phase angle of 90 degrees around the optical axis C and sandwiching the diagonal line L1. Each actuator 22 having the same configuration includes a magnet 22a and a coil 22b. Each magnet 22 a is fixed to a flat portion 16 h provided on the outer periphery of the movable member 10 of the lens frame 16, and each coil 22 b is fixed to the concave portion 10 u of the movable member 10.

  The lid member 5 disposed on the opening-side edge 2f of the plate-like base member 2 has a circular opening 5a centered on the optical axis C. The screw 28 inserted into the through-hole 5b disposed opposite to the optical axis C is screwed into the screw hole 2t provided in the base member 2, so that the lid member 5 is fixed to the base member 2. Yes.

  The lid member 5 is provided with two Hall elements 27 that are magnetic field detection elements. The hall element 27 detects the magnetic field of the magnet 22 a disposed in the lens frame 16. The hall element 27 is arranged with a phase angle of 90 degrees around the optical axis C in a plane orthogonal to the optical axis C. Therefore, the position of the movable member 10 in the plane orthogonal to the optical axis C can be detected, and the position of the movable member 10 can be controlled based on the orthogonal coordinate system.

  As shown in FIG. 1, the flexible printed circuit board 40 for supplying a current to the coil 22 b fixed to the movable member 10 has a main body 41 exposed to the outside of the base member 2. A circuit connection piece 42 for securing an electrical connection with an external circuit (not shown) and a flexible portion 43 disposed inside the base member 2 are fixed to the body portion 41 having an L shape. ing.

  As shown in FIG. 1 and FIG. 5, the main body 41 extending along the wall surfaces of the outer peripheral walls 2y and 2z of the base member 2 is bent at the corner 2j, and from the groove 2k provided in the corner 2h. It is introduced into the base member 2. In the main body 41, the free end portion 41d of the first extending portion 41a is widened and fixed to the outer peripheral wall 2z. In the main body portion 41, the end portion of the second extending portion 41b extending between the corner portion 2j and the corner portion 2h is a fixed portion that is bent so as to be fixed in the vicinity of the corner portion 2h in the outer peripheral wall 2y. 41c. A circuit connection piece 42 is fixed to the extending portion 41b.

  The flexible portion 43 extends from the fixed portion 41c as a starting point. The flexible portion 43 is introduced into the base member 2 from a groove 2k provided in the corner portion 2h of the base member 2 (see FIG. 2). Such a flexible part 43 includes a first branch part 44 extending along the second extension part 41 b and a second branch extending in a direction orthogonal to the first branch part 44. Branched to a portion 45.

  As shown in FIGS. 6 and 7, the first branch portion 44 includes a first deformable portion 44 a extending from the branched base portion 43 a, and a free end portion 44 b fixed to the upper surface 10 v of the movable member 10. It has. The first deformable portion 44a is curved in a direction intersecting with the direction in which the first branch portion 44 extends, and has flexibility in a direction orthogonal to the optical axis C. A connecting portion 44c connected to the wire of the coil 22b fixed to the movable member 10 is provided between the first deformable portion 44a and the free end portion 44b. Accordingly, a current is supplied from the circuit connection piece 42 connected to an external circuit (not shown) to the coil 22b via the connection portion 44c.

  As shown in FIGS. 8 and 9, the second branch portion 45 includes a first deformable portion 45 a different from the first deformable portion 44 a and a free end portion fixed to the upper surface 10 v of the movable member 10. 45b. The first deformation portion 45a extending from the base portion 43a is curved in a direction intersecting with the direction in which the second branch portion 45 extends, and has flexibility in a direction orthogonal to the optical axis C. . A connecting portion 45c connected to the wire of the coil 22b is provided between the first deformable portion 45a and the free end portion 45b. Therefore, a current is supplied from the circuit connection piece 42 connected to an external circuit (not shown) to the coil 22b via the connection portion 45c.

  Next, the operation of the camera shake correction mechanism 3 will be described. If camera shake occurs when shooting with a device (for example, a camera) in which the lens driving device 1 is incorporated, the position of the optical axis C may change. In this case, a sensor that detects camera shake, such as a gyro sensor, detects camera shake, and the control means (not shown) controls the camera shake correction mechanism 3 so that the position of the optical axis C on the image sensor is maintained at a predetermined position. A control signal for driving is output to the coils 12b of the actuators 12, 13, and 14.

  In this case, as shown in FIG. 4, upon receiving the control signal, the actuator 12 generates a driving force F1 and linearly moves the movable member 10 in the direction of the linear movement locus T1. When receiving the control signal, the actuators 13 and 14 generate the driving force F2 and rotate the movable member 10 in the direction of the rotational movement locus T2. By this linear movement and rotation, the position of the optical axis C is moved to a predetermined position. At this time, since the movement of the movable member 10 is restricted by the restriction means 15, the movable member 10 has two degrees of freedom, which is a total of one degree of freedom by linear movement and one degree of freedom by rotation. For this reason, the movable member 10 can move the position of the optical axis C to a desired position within the range S. By this movement, the position of the optical axis C on the image sensor (for example, CMOS) is maintained at a predetermined position, and camera shake is corrected.

  In the lens driving device 1 having such a configuration, the movable member 10 performs linear movement in the direction of the linear movement locus T1 and rotation about the point on the linear movement locus T1 as the rotation center RC by the restricting unit 15. . In the vicinity of the restricting means 15, since the moving distance of the movable member 10 with respect to the base member 2 is small, the flexible portion 43 extending from the fixed portion 41 c fixed to the base member 2 as a starting point. The amount of deformation is suppressed. When the deformation amount of the flexible portion 43 is suppressed, the stress acting on the flexible portion 43 is reduced, so that the breakage of the conductor pattern in the flexible portion 43 can be suppressed. Therefore, a current can be reliably supplied to the coil 22b over a long period of time.

  Further, when the deformation amount of the flexible portion 43 of the flexible printed circuit board 40 is suppressed, the reaction force generated due to the deformation of the flexible portion 43 is reduced, and it is difficult to hinder the movement of the movable member 10. Therefore, accurate camera shake correction can be performed.

  Moreover, since the flexible part 43 has the 1st deformation | transformation parts 44a and 45a which can deform | transform in the direction orthogonal to the optical axis C, it becomes difficult to prevent the movement of the movable member 10. FIG. Therefore, accurate camera shake correction can be performed.

  Further, in the regulating means 15 of the lens driving device 1, the spherical body 9 a is disposed in the groove 10 b provided in the movable member 10. According to such a configuration, since the spherical body 9c makes point contact with the movable member 10 and the frictional resistance between the movable member 10 and the spherical body 9a is reduced, it is difficult to hinder the movement of the movable member 10. Become. Therefore, accurate camera shake correction can be performed.

[Second Embodiment]
As shown in FIG. 10, in the lens driving device 50 according to the second embodiment, the magnet 22a is fixed to the movable member 52 and the coil 22b is a lens compared to the lens driving device 1 according to the first embodiment. The point fixed to the frame 53 (see FIG. 11) and the flexible printed circuit board 60 can be deformed in the direction of the optical axis C and the first deformable portion 62 that can be deformed in a direction orthogonal to the optical axis C. The point which has the 2nd deformation | transformation part 63 is mainly different.

  As shown in FIG. 12, the base member 51 includes a corner 2r formed at a position facing the corner 2h on the diagonal L1, and a corner formed at a position facing the corner 2j on the diagonal L2. 2u. The support surface 2b of the base member 51 is provided with three concave portions 2c and one hole portion 2m. The hole 2m is provided between the opening 2d and the corner 2h in the vicinity of the corner 2h.

  The support means 8 includes three metal spherical bodies 9b, 9c and 9d. The spherical body 9d is disposed in a recess 2c provided in the vicinity of the corner 2h.

  As shown in FIG. 10, a shaft 18 a fixed to the movable member 52 is inserted into the coil spring 18 d for pressurizing the lens frame 53 in the direction of the optical axis C. One end of the coil spring 18d is in contact with the movable member 52, and the other end of the coil spring 18d biases the lens frame 53 in the direction of the optical axis C.

  As shown in FIG. 13, the restricting means 55 includes a pin 56 fixed to the base member 51 and a groove 52 b provided in the movable member 52. The pin 56 is a columnar member extending in the direction of the optical axis C. The base end of the pin 56 is inserted and fixed in the hole 2m formed in the base member 51 (see FIG. 12).

  The groove 52 b formed in the movable member 52 is a long groove extending along the diagonal line L <b> 1 in the movable member 52. The groove 52b having a rectangular cross section has a pair of side walls 52t facing each other for defining a width in which the pin 56 can slide. The groove 52b is formed at a position corresponding to the position of the hole 2m into which the pin 56 is inserted on the bottom surface 10c (see FIG. 10). By forming the groove 52b at such a position, the pin 56 can be inserted into the groove 52b. The width of the groove 52b in the direction orthogonal to the longitudinal direction is set such that the pin 56 can slide with respect to the side wall 10t of the groove 52b.

  A pin 56 is inserted into the groove 52b of the movable member 52, and the groove 52b extends along the diagonal line L1. Therefore, the movable member 52 can be linearly moved while being guided in the direction of the linear movement locus T1 set in the direction in which the side wall 52t of the groove 52b extends, and the pin 56 disposed on the linear movement locus T1. Can be rotated along a rotational movement trajectory T2 having the rotation center RC as the center of rotation.

  The movable range S of the optical axis C is based on a distance allowing linear movement and an angle allowing rotation. The distance in which the movable member 52 can move linearly is determined by the length of the groove 52b in the longitudinal direction. Further, as shown in FIG. 11, the angle at which the movable member 52 can be rotated is the contact between the notches 52 y and 52 z provided on the outer edge of the movable member 52 and the inner wall surface 51 x of the base member 51. The contact portions 51y and 51z have a surface 51w along the longitudinal direction of the groove 52b, which is determined by the gap between the portions 51y and 51z.

  Each magnet 22 a of the lens driving means 19 is fixed to a standing piece 10 e provided on the movable member 52, and each coil 22 b is fixed to the flat portion 16 k of the lens frame 53.

  As shown in FIG. 10, the lid member 54, which is a box-shaped member, is provided with a tongue piece 5 h extending in the direction of the optical axis C at each corner. The tongue piece 5h is provided with a long hole 5k that penetrates in a direction orthogonal to the optical axis C and extends in the direction of the optical axis C. On the other hand, each of the corner portions 2h, 2j, 2s, 2u of the base member 2 is provided with a protruding portion 2v extending along the direction of the optical axis C. The lid member 54 is fixed to the base member 51 by fitting the protrusion 2v of the base member 2 into the long hole 5k. A flexible printed circuit board 60 is fixed to each of the corner 5s of the lid member 54 corresponding to the corner 2r of the base member 51 and the corner 5j of the lid member 54 corresponding to the corner 2j of the base member 51. A flat portion 5m is provided.

  The flexible printed circuit board 60 for supplying a current to the coil 22b fixed to the lens frame 53 has a main body 61 that extends perpendicular to the optical axis C. The main body 61 includes a fixed end 61a fixed to the lid member 54, a circuit connection piece 61c that is exposed to the outside of the base member 51 and ensures electrical connection with an external circuit (not shown), a lid An arc portion 61d disposed on the upper surface 5c of the lid member 54 so as to surround the opening 5a of the member 54, and an element connection portion for ensuring electrical connection with the Hall element 27 provided on the lid member 54 are provided. And a free end portion 61b of the arc portion 61d.

  A free end portion 61b is formed at one end of the arc portion 61d, and a base portion 61g provided with an element connection portion for ensuring electrical connection with the Hall element 27 provided in the lid member 54 is formed at the other end. ing. Between the free end portion 61b and the base portion 61g, a position corresponding to the corner portions 5s and 5j of the lid member 54 is bent in the direction of the optical axis C with respect to the arc portion 61d, and is formed on the flat portion 5m of the lid member 54. A fixed end 61a to be fixed is provided.

  As shown in FIG. 11, the base 61g is bent at the corner 5n of the lid member 54 corresponding to the corner 2h of the base member 51 in the direction of the optical axis C with respect to the base 61g. A first extending portion 61e extending from the corner portion 2h to the corner portion 2j is disposed along the outer peripheral wall 2y. The first extending portion 61e has a fixing portion 61f bent to be fixed in the vicinity of the corner portion 2h.

  As shown in FIGS. 14, 15, and 16, the flexible portion 65 extends from the fixing portion 61 f as a starting point. The flexible portion 65 includes a first deformable portion 62 having flexibility in a direction orthogonal to the optical axis C, a second deformable portion 63 having flexibility in the direction of the optical axis C, and a lens frame. And free end portions 64 a and 64 b fixed to 53. 14, 15, and 16, illustration of the fixed end 61 a, the free end 61 b, the circuit connection piece 61 c, and the arc portion 61 d in the main body 61 of the flexible printed circuit board 60 is omitted.

  One end of a second deformable portion 63 extending linearly is fixed to the fixed portion 61f, and the other end of the second deformable portion 63 is bent with respect to the second deformable portion 63 and extends linearly. The first deformation portion 62 is fixed. The second deforming portion 63 extends from the corner portion 2h toward the corner portion 2r along the outer periphery of the opening 5a of the lens frame 53 (see FIG. 11). The width direction of the second deforming portion 63 is arranged in a plane orthogonal to the optical axis C. With such a configuration, the second deformable portion 63 can have flexibility in the direction of the optical axis C.

  The first deformation portion 62 extends so as to surround the shaft 18c (see FIG. 11). The width direction of the first deforming portion 62 is arranged in a plane parallel to the optical axis C. With such a configuration, the first deforming portion 62 can have flexibility in a direction orthogonal to the optical axis C.

  The free end portions 64 a and 64 b are branched from the base portion 62 a of the first deformable portion 62. A wire of a coil 22b fixed to the lens frame 53 is connected to each of the free ends 64a and 64b fixed to the outer peripheral surface 16j of the lens frame 53.

  Also in the lens driving device 50 having such a configuration, the same effect as that of the lens driving device 1 according to the first embodiment can be obtained. Further, by providing the second deformable portion 63 having flexibility in the direction of the optical axis C, it is difficult to prevent the movement of the lens frame 53 in the direction of the optical axis C. Therefore, accurate focus adjustment can be performed.

  Further, according to the regulating means 55, the side surface of the pin 56 slides in line contact with the side wall 52t of the groove 52b, and the pin 56 is guided in the direction of the linear movement locus T1. Accordingly, since the pin 56 is in line contact with the side wall 52t of the groove 52b and the movable member 52 is prevented from being inclined with respect to a plane orthogonal to the optical axis C, the movable member 52 can be linearly moved with high accuracy. it can.

  The present invention is not limited to the embodiment described above.

  The restricting means 15 and 55 have a restricting protrusion that is circular in plan view in the direction of the optical axis C, and a restricting surface that extends in a direction orthogonal to the optical axis C and on which the restricting protrusion slides. It is sufficient that various forms are adopted without departing from this configuration.

  The restricting means 15 and 55 may be configured by arranging the spherical body 9a or the pin 56 in a groove having a trapezoidal cross section. Further, the spherical body 9a or the pin 56 may be arranged in a groove having a pair of inclined surfaces forming a V shape. According to these configurations, since the pin 56 or the spherical body 9a and the groove are in point contact, the frictional resistance can be reduced.

  Further, the regulating means 15 and 55 may be configured by arranging a pin 56 in a through-hole having a rectangular cross section. Since the pin 56 is in line contact with the wall surface of the through hole, the movable member 52 can be prevented from being inclined with respect to a plane orthogonal to the optical axis C. Moreover, the pin 56 may be arrange | positioned and comprised in the through-hole which has a pair of inclined surface which makes V shape. Since the pin 56 makes point contact with the pair of inclined surfaces, the frictional resistance can be reduced. Further, the spherical body 9a may be arranged in a through hole having a rectangular cross section or a through hole having a pair of slopes having a V shape.

  In addition, the grooves 10b and 52b may be provided with protrusions in which the portions in contact with the grooves 10b and 52b are formed in a spherical shape. Since the protruding portion makes point contact with the movable member 10, the frictional resistance can be reduced.

  In the restricting means 55, the pin 56 may be fixed to the movable member 52, and the groove 52 b may be formed in the base member 51. Further, the pin 56 constituting the pin portion may not be a member separate from the base member 51 or the movable member 52, and may be formed integrally with the base member 51 or the movable member 52.

  The lens frame 16 of the focus adjustment mechanism 4 has a focus adjustment lens for focus adjustment, but may have a zoom lens for angle of view adjustment.

DESCRIPTION OF SYMBOLS 1,50 ... Lens drive device, 2,51 ... Base member, 3 ... Camera shake correction mechanism, 4 ... Focus adjustment mechanism, 5,54 ... Cover member, 8 ... Support means 10, 52 ... Movable member, 15, 55 ... Restricting means, 16, 53 ... lens frame, 22b ... coil, 30 ... camera shake correction device, 40, 60 ... flexible printed circuit board, 41c, 61f ... fixed part, 43, 65 ... flexible part, 41d, 64a, 64b ... free play End part 44a, 45a, 62 ... 1st deformation | transformation part, 63 ... 2nd deformation | transformation part, C ... Optical axis, T1 ... Linear movement locus, T2 ... Rotation movement locus, RC ... Rotation center.

Claims (3)

A base member;
A movable member disposed on the base member and movable in accordance with image blur in a plane perpendicular to the optical axis;
A lens frame attached to the movable member and movable in the direction of the optical axis;
A flexible printed circuit board that is electrically connected to a coil provided on the movable member or the lens frame and supplies a current to the coil;
A plane perpendicular to the optical axis by two movement loci, a linear movement locus that moves in a direction orthogonal to the optical axis and a rotational movement locus that rotates around a point on the linear movement locus. Regulating means for regulating movement of the movable member in
With
The flexible printed circuit board has a flexible portion extending from a portion fixed to the base member in the vicinity of the restricting means, and the free end portion of the flexible portion is provided with the coil. A lens driving device fixed to a movable member or the lens frame. The coil and the free end are each fixed to the movable member,
The lens driving device according to claim 1, wherein the flexible portion includes a first deformable portion that is deformable in a direction orthogonal to the optical axis. The coil and the free end are each fixed to the lens frame,
The flexible portion includes a first deformable portion that can be deformed in a direction orthogonal to the optical axis, and a second deformable portion that can be deformed in the direction of the optical axis. 2. The lens driving device according to 1.

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