JP5905276B2 - Lens drive device - Google Patents

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, as a technology in such a field, there is a lens driving device described in JP-A-2006-47356. The lens driving device is supported by a lens frame that holds the lens, a cover that accommodates the lens frame, a fixed frame that supports the lens frame so as to be movable in the optical axis direction, and is rotatable with respect to the fixed frame. And a cam barrel. A coil spring is disposed between the lens frame and the cover. This coil spring urges the lens frame toward the fixed frame. An end face cam is provided at the end of the cam cylinder to which the stepping motor is connected. The lens frame in contact with the end face cam can move in the optical axis direction corresponding to the shape of the end face cam. Such a configuration does not require a gear mechanism or the like for transmitting the rotational force of the stepping motor in order to drive the lens frame, so that the apparatus can be miniaturized.

JP 2006-47356 A

  However, in the lens driving device described in Patent Document 1, the end of the lens frame is biased over the entire circumference by a single coil spring, but the end surface of the coil spring hits the end of the lens frame. There is a fear. Therefore, it is difficult for the coil spring to generate the urging force uniformly over the entire circumference of the lens frame, and the lens frame to which the unequal urging force is applied may be inclined with respect to the optical axis, and the focus adjustment accuracy There has been a problem of lowering.

  Accordingly, an object of the present invention is to provide a lens driving device capable of performing focus adjustment with high accuracy.

  In order to solve the above problems, a lens driving device according to the present invention includes a movable member that moves in a plane orthogonal to the optical axis, a lens frame that is attached to the movable member and moves in the direction of the optical axis, A driving force for the lens frame that moves the lens frame in the direction of the optical axis by applying a driving force along the direction of the optical axis to the lens frame, and is disposed between the movable member and the lens frame. Urging means for urging the lens frame in a direction opposite to that of the lens frame, and urging force is equally applied to the end of the lens frame at equal intervals on the circumference around the optical axis by the urging means. Is granted.

  According to the lens driving device described above, the end of the lens frame is not evenly biased over the entire circumference, and the position where the biasing force is applied is the circumference around the optical axis. It is set at equal intervals above. Further, an urging force having an equal size is applied to each position. Therefore, in a miniaturized lens driving device, it is difficult to urge the end of the lens frame over the entire circumference. Therefore, if the configuration as in the present invention is adopted, the lens frame is used as the optical axis. It is possible to move without tilting, and it is possible to suppress a decrease in focus adjustment accuracy.

Further, the base member, the movable member driving means for moving the movable member in a direction orthogonal to the optical axis corresponding to the image shake, and the movement of the movable member within a plane orthogonal to the optical axis are regulated. The restricting means is movable 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. It regulates the movement of the member.

  By such a restricting means, the movement of the movable member is restricted to the linear movement to the linear movement locus and the rotation around the point on the linear movement locus. As a result, it is possible to suppress unnecessary rotation about an unintended point on the plane as a rotation center, so that it is possible to perform image blur correction with high accuracy.

  The biasing means is a leaf spring having an outer peripheral portion fixed to the movable member, an inner peripheral portion fixed to the lens frame, and an elastic portion connecting the outer peripheral portion and the inner peripheral portion. The elastic portions may be arranged at equal intervals on the circumference around the optical axis.

  As described above, the leaf spring having the outer peripheral portion and the inner peripheral portion has high seating stability, and on the circumference centered on the optical axis, the elastic portion is equally spaced and evenly provided by a single leaf spring. There exists an effect that it is easy to arrange.

  ADVANTAGE OF THE INVENTION According to this invention, the lens drive device which can perform an accurate focus adjustment can be provided.

It is a disassembled perspective view which shows the lens drive device which concerns on 1st Embodiment. It is sectional drawing of the lens drive device shown by FIG. It is a bottom view of the movable member shown by FIG. FIG. 2 is a plan view of the lens driving device shown in FIG. 1. It is a perspective view which shows the focus adjustment mechanism of the lens drive device which concerns on 2nd Embodiment. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is a perspective view which shows the focus adjustment mechanism of the lens drive device which concerns on 3rd Embodiment. FIG. 8 is a cross-sectional view taken along line VII-VII in FIG. 7. It is a perspective view which shows the focus adjustment mechanism of the lens drive device which concerns on 4th Embodiment. FIG. 10 is a cross-sectional view taken along line XX in FIG. 9.

  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 FIGS. 1 and 2, a lens driving device 1 that is used in a digital camera by correcting camera shake includes a box-shaped base member 2 that houses a camera shake correction mechanism 3 and a focus adjustment mechanism 4, and focus adjustment. A camera shake correction mechanism 3 that corrects camera shake by moving the mechanism 4 in a plane orthogonal to the optical axis C, a focus adjustment mechanism 4 that has a lens (not shown), and moves the lens in the direction of the optical axis C; A lid member 5 for closing the base member 2 and a flexible printed circuit board 6 for securing an electrical connection between the lens driving device 1 and an external circuit are provided. 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 a recess 2c and a hole 2g, and the hole 2g is formed between a circular opening 2d centered on the optical axis C and one 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 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 support portions 9. Each support portion 9 includes a metal spherical body 9a that supports the movable member 10, and a pair of sliding plates 9b that sandwich the spherical body 9a and reduce the rolling resistance of the spherical body 9a.

  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 is a rectangular parallelepiped member having 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.

  The bottom surface 10c of the movable member 10 is provided with a recess 10d for fixing one sliding plate 9b (see FIG. 3). In order to fix the other sliding plate 9b, a recess 2c is formed in the base member 2 at a position corresponding to the recess 10d. A spherical body 9a is disposed between the recess 2c and the recess 10d. The inner diameters of the recesses 2c and 10d are formed larger than the outer diameter of the spherical body 9a. For this reason, since the spherical body 9a can roll within the range of the recessed part 2c, the movement range of the movable member 10 can be controlled. In addition, the support part 9 should just be supported so that the movable member 10 can move within a plane.

  As shown in FIGS. 2 and 3, 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. On the diagonal line L1, the actuator 12 and the groove | channel 10b mentioned later are arrange | positioned. The actuator 12 and the groove 10b are provided to face each other with the optical axis C interposed therebetween. 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 line L2 orthogonal to the diagonal line 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 FIGS. 1 and 2, the actuator 12 includes a magnet 12a and a coil 12b. The magnet 12 a is disposed in the recess 10 r on the bottom surface 10 c of the movable member 10, and the coil 12 b is disposed in the recess 2 p formed on the support surface 2 b of the base member 2. The magnet 12a is disposed so as to face the coil 12b.

  The actuator 12 is disposed between a pair of yoke plates 12c and 12d, one of which is disposed on the magnet 12a side and the other is disposed on the coil 12b side. According to such an arrangement, the magnetic paths of the magnet 12a and the coil 12b are secured. Even when the coil 12b is not energized, the movable member 10 is maintained at a fixed position because a magnetic attractive force acts between the magnet 12a and the yoke plate 12d.

  As shown in FIGS. 2 and 3, the restricting means 15 for restricting the movement of the movable member 10 includes a pin 7 fixed to the base member 2 and a groove 10 b provided in the movable member 10. ing.

  The pin 7 is a cylindrical member extending in the direction of the optical axis C. The base end of the pin 7 is inserted and fixed in a hole 2g formed in the base member 2.

  As shown in FIG. 3, the groove 10 b formed in the movable member 10 is a long groove extending along the diagonal line L <b> 1 in the movable member 10. The groove 10b is formed on the bottom surface 10c at a position corresponding to the position of the hole 2g into which the pin 7 is inserted. By forming at such a position, the pin 7 is inserted into the groove 10b. The width in the direction perpendicular to the longitudinal direction of the groove 10b is set to a width that allows the pin 7 to slide relative to the side surface of the groove 10b. The groove 10b having a rectangular cross section has a pair of side walls 10t facing each other for defining a width in which the pin 7 can slide.

  A pin 7 is inserted into the groove 10b of the movable member 10, and the groove 10b extends along the diagonal line L1. Therefore, 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, and the pin 7 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. 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 in which the movable member 10 can move linearly is determined by the length of the groove 10b in the longitudinal direction. The angle at which the movable member 10 can be rotated is determined by the distance of the spherical body 9a in the recess 2c or the recess 10d.

  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), a plate spring 17 that biases the lens frame 16 in the direction of the optical axis C, 18, a lens frame driving means 19 that drives the lens frame 16 in the direction of the optical axis C, and a fixed frame 21 that reinforces the fixed state of the leaf spring 17 to the movable member 10.

  A 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. The lens frame 16 is sandwiched between a pair of leaf springs 17 and leaf springs 18 in the direction of the optical axis C.

  The leaf spring (biasing means) 17 fixed to the one end surface 16b of the lens frame 16 is a rectangular thin plate member having a circular opening 17a with the optical axis C as the center. The conductive leaf spring 17 includes an outer peripheral portion 17c for holding the position of the entire plate spring 17, an inner peripheral portion 17d fixed to the lens frame 16, and an outer peripheral portion 17c and an inner peripheral portion 17d. It has the arm part (elastic part) 17b to connect.

  As shown in FIG. 4, the plate spring 17 is provided with four arm portions 17 b that give elasticity in the direction of the optical axis C. The arm portions 17b made of the same material have the same size and shape. More specifically, the thickness of the arm portion 17b in the direction of the optical axis C, the width of the arm portion 17b in the direction perpendicular to the optical axis C including the optical axis C, and the circumferential direction around the optical axis C The length is designed to be the same between the arm portions 17b. By being configured in this way, an equal urging force can be generated in each of the arm portions 17b. Further, the arm portion 17b is arranged with a phase angle of 90 degrees around the optical axis C in a plane orthogonal to the optical axis C. That is, the pair of arm portions 17b are arranged with a point-symmetrical relationship about the optical axis C.

  One end of the arm portion 17b is connected to the outer peripheral portion 17c, and the other end is connected to the inner peripheral portion 17d. Here, the other end of the arm portion 17 b functions as a force point 17 s for applying an urging force generated by the arm portion 17 b to the lens frame 16. By arranging the other end of the arm portion 17b with a phase angle of 90 degrees on the circumference centered on the optical axis C, the force point 17s similarly has a phase of 90 degrees on the circumference centered on the optical axis C. It will be arranged with corners. With such a configuration, the biasing force applied at equal intervals on the circumference around the optical axis C acts on the lens frame 16.

  As shown in FIG. 1, the leaf spring (biasing means) 18 fixed to the other end face 16 c of the lens frame 16 is a rectangular thin plate member having a circular opening 18 a centering on the optical axis C. . The conductive leaf spring 18 includes an outer peripheral portion 18c for holding the position of the entire plate spring 18, an inner peripheral portion 18d fixed to the lens frame 16, and an outer peripheral portion 18c and an inner peripheral portion 18d. It has the arm part (elastic part) 18b to connect.

  The leaf spring 18 disposed between the movable member 10 and the lens frame 16 has an outer peripheral portion 18c bonded and fixed to the bottom surface 10g of the movable member 10, and an inner peripheral portion 18d bonded and fixed to the other end surface 16c of the lens frame 16. (See FIG. 2). As for the outer peripheral part 18c of the leaf | plate spring 18, the whole flame | frame which comprises the outer peripheral part 18c is adhere | attached and fixed to the bottom face 10g of the movable member 10. FIG.

  The shape of the arm portion 18 b of the leaf spring 18 is the same as that of the leaf spring 17. Since the configuration of the arm portion 18b is similar to the configuration of the arm portion 17b of the leaf spring 17, a detailed description thereof will be omitted.

  As shown in FIGS. 1 and 2, the lens frame driving means 19 for driving the lens frame 16 in the direction of the optical axis C includes four actuators 22. The actuators 22 are arranged with a phase difference of 90 degrees from each other on a plane orthogonal to the optical axis C. Each of the four actuators 22 is disposed between the arm portions 17 b and 18 b of the leaf springs 17 and 18. Each actuator 22 having the same configuration includes a magnet 22a and a coil 22b. The magnet 22 a is fixed to the upright piece 10 s of the movable member 10, and the coil 22 b is fixed on the outer peripheral surface of the lens frame 16.

  The fixed frame 21 for reinforcing the fixed state of the leaf spring 17 to the movable member 10 is a plate-like member having an opening 21a. The fixed frame 21 is fixed to the top surface of the upright piece 10 s of the movable member 10.

  The lid member 5 is a plate-like member that is fixed to the edge portion 2 f on the opening side of the base member 2 and has a circular opening portion 5 a centering on the optical axis C. 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 on the movable member 10. Since these Hall elements 27 are arranged at intervals of 90 degrees, the position of the movable member 10 in a plane orthogonal to the optical axis C can be detected.

  A flexible printed circuit board 6 which is a circuit board for ensuring electrical connection between the lens driving device 1 and an external circuit is connected to the Hall element 27.

  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. 3, 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, the movement of the movable member 10 is restricted by the restricting means 15, and has two degrees of freedom that 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 urging force is not applied to the one end surface 16b and the other end surface 16c of the lens frame 16 over the entire circumference. They are set at equal intervals on the circumference around the optical axis C. Further, an urging force having an equal size is applied to each position. Therefore, in the downsized lens driving device 1, since it is difficult to bias the one end surface 16b and the other end surface 16c of the lens frame 16 over the entire circumference, the configuration as in the first embodiment. If the lens frame 16 is employed, the lens frame 16 can be moved without being inclined with respect to the optical axis C, and a reduction in focus adjustment accuracy can be suppressed.

  In addition, since the camera shake correction mechanism 3 includes the restriction unit 15, the movement of the movable member 10 moves along a linear movement locus T1 orthogonal to the optical axis C, and points on the linear movement locus T1. The rotation center RC is restricted to rotate along the rotational movement locus T2. By restricting the movement of the movable member 10, it is possible to suppress the occurrence of unnecessary rotation around an unintended point on the support surface 2 b as the rotation center, and thus it is possible to perform highly accurate camera shake correction. Furthermore, since the lens driving device 1 does not require an actuator or the like for correcting the movement of the movable member 10 due to unnecessary rotation, the lens driving device 1 can be reduced in size without increasing the number of parts constituting the lens driving device 1. Contributes to

  Further, the leaf springs 17 and 18 having the outer peripheral portions 17c and 18c and the inner peripheral portions 17d and 18d have high seating stability, and on the circumference around the optical axis C, the arm portion (elastic portion) 17b. , 18b can be easily arranged at equal intervals and evenly by a single leaf spring 17, 18.

[Second Embodiment]
As shown in FIGS. 5 and 6, the focus adjustment mechanism 40 of the lens driving device according to the second embodiment is a guide shaft compared to the focus adjustment mechanism 4 of the lens driving device 1 according to the first embodiment. The point provided with 41 and 42 is different from the point that the biasing means is constituted by a coil spring.

  The focus adjustment mechanism 40 includes guide shafts 41 and 42 for guiding the lens frame 16 in the direction of the optical axis C. The guide shafts 41 and 42 are provided at positions facing each other across the optical axis C. The guide shaft 42 is slidably passed through a guide hole 16 e provided in the lens frame 16.

  The focus adjustment mechanism 40 uses two coil springs 43 and 44 as urging means. Each of the coil springs 43 and 44 is disposed at a position facing each other across the optical axis C. Further, the center of the coil spring 43 is disposed so as to overlap with the center of the guide shaft 41, and the center of the coil spring 44 is disposed so as to overlap with the center of the guide shaft 42.

  Each of the coil springs 43 and 44 has the same spring constant. In addition, as long as the spring constant is the same in the coil springs 43 and 44, shape dimensions, such as the length of a coil spring and an internal diameter, may not be the same.

  Also in the lens driving device including the focus adjustment mechanism 40 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 guide shafts 41 and 42, the lens frame 16 moves with high accuracy in the direction of the optical axis C, so that the accuracy of focus adjustment can be further increased.

[Third Embodiment]
As shown in FIGS. 7 and 8, the focus adjustment mechanism 50 of the lens driving device according to the third embodiment has a guide shaft compared to the focus adjustment mechanism 4 of the lens driving device 1 according to the first embodiment. The point provided with 41 and 42 is different from the point that the urging means is constituted by two leaf springs.

  The focus adjustment mechanism 50 uses two leaf springs 51 and 52 as urging means. Each of the leaf springs 51 and 52 is disposed at a position facing each other across the optical axis C. The plate springs 51 and 52 connect the elastic portions 53a and 53b having an S shape in a plane orthogonal to the optical axis C, and the tip of the elastic portion 53a and the tip of the elastic portion 53b to connect the lens frame 16. And a base 53d that is fixed to the movable member 10 by connecting the base end of the elastic portion 53a and the base end of the elastic portion 53b. The leaf springs 51 and 52 have a hollow shape, and the tips of the guide shafts 41 and 42 protrude from the hollow portion 53e.

  The leaf springs 51 and 52 are formed symmetrically about a base line L4 connecting the centers of the guide shafts 41 and 42. Then, by arranging the elastic portions 53a and 53b symmetrically with respect to the base line L4, it is possible to set the force point at which the urging force acts on the base line L4. Therefore, the urging force applied at equal intervals (every 180 °) on the circumference around the optical axis C can be applied to the lens frame 16.

  Also in the lens driving device including the focus adjustment mechanism 50 having such a configuration, the same effect as that of the lens driving device 1 according to the first embodiment can be obtained.

[Fourth Embodiment]
As shown in FIGS. 9 and 10, the focus adjustment mechanism 60 of the lens driving device according to the fourth embodiment is a guide shaft compared to the focus adjustment mechanism 4 of the lens driving device 1 according to the first embodiment. The point provided with 41 and 42 is different from the point that the urging means is composed of a magnet.

  In this focus adjustment mechanism 60, a biasing means 63 having a pair of two block-shaped magnets 61 and 62 arranged facing each other in the direction of the optical axis C, and a magnet 61 having the same magnetic force as the biasing means 63. , 62 is used as a pair. Each of the biasing means 63 and 64 is disposed at a position facing each other with the optical axis C interposed therebetween. Between the magnet 61 and the magnet 62, it arrange | positions so that a magnetic attraction force may act in the direction of the optical axis C. This magnetic attraction force becomes a force for urging the lens frame 16 in the direction opposite to the driving force of the lens frame driving means 19.

  Also in the lens driving device including the focus adjustment mechanism 60 having such a configuration, the same effect as that of the lens driving device 1 according to the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Lens drive device, 2 ... Base member, 3 ... Camera shake correction mechanism, 4 ... Focus adjustment mechanism, 5 ... Cover member, 6 ... Flexible printed circuit board, 7 ... Pin, 8 ... Support means, 10 ... Movable member, 11 ... Movable member driving means, 15 ... restricting means, 16 ... lens frame, 17, 18 ... leaf spring (biasing means), 17b, 18b ... arm parts (elastic parts), 17c, 18c ... outer peripheral parts, 17d, 18d ... Inner peripheral portion, 19 ... lens frame driving means, 21 ... fixed frame, 30 ... camera shake correction device (image shake correction device), 43, 44 ... coil spring (biasing means), 51, 52 ... leaf spring (biasing means) ), 63, 64 ... biasing means, C ... optical axis, T1 ... linear movement locus, T2 ... rotational movement locus, RC ... rotation center.

Claims (3)

A base member;
A movable member disposed on the base member and moving in a plane perpendicular to the optical axis;
Movable member driving means for moving the movable member in a direction orthogonal to the optical axis in accordance with image shake;
2 of a linear movement locus that is provided between the base member and the movable member and moves in a direction orthogonal to the optical axis, and a rotational movement locus that rotates around a point on the linear movement locus. Restricting means for restricting movement of the movable member by one movement locus;
A lens frame attached to the movable member and moving in the direction of the optical axis;
Lens frame driving means for applying a driving force along the direction of the optical axis to the lens frame to move the lens frame in the direction of the optical axis;
The lens frame is disposed between the movable member and the lens frame, urges the lens frame in a direction opposite to the direction of the driving force, and on the circumference around the optical axis at the end of the lens frame. Provided with biasing means for imparting a biasing force evenly and evenly;
The lens driving device according to claim 1, wherein the regulating means is disposed on a diagonal line of the movable member . 2. The lens driving device according to claim 1, wherein the movable member has a square shape. The biasing means is a leaf spring having an outer peripheral part fixed to the movable member, an inner peripheral part fixed to the lens frame, and an elastic part connecting the outer peripheral part and the inner peripheral part. Because
The lens driving device according to claim 1, wherein the elastic portions are arranged at equal intervals on a circumference centered on the optical axis.

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