JP2009103847A - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive device that is compact and inexpensive and that prevents a perpendicular line of a face formed by an opening of a lens frame from displacing from an optical axis. <P>SOLUTION: The lens drive device 10 includes: the lens frame 15 that holds a lens so as to be movable in the direction of the optical axis of the lens; a rotor 115 that is rotated having as its rotation axis an axis perpendicular to the optical axis, has two stopping positions, and is fixed on the upper face of the device; a drive lever 13, the one end of which is connected to a side of the rotor 115; and a transmission member 19 that is engaged with the drive lever 13 and lens frame 15. The transmission member 19 is biased so as to prevent the perpendicular line of the face formed by the opening of the lens frame 15 from displacing from the optical axis. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lens driving device for driving a lens. In particular, the present invention relates to a lens driving device for switching a shooting distance of a camera.

  In general, a lens driving device for moving a lens to a desired position is incorporated in an optical device such as a camera. This lens driving device is used, for example, for macro photography (close-up photography) by moving a lens in the optical axis direction in a camera.

  In recent years, miniaturization of optical devices such as cameras has progressed, and there is a demand for further miniaturization of lens driving devices. At the same time, there is a demand for cost reduction such as a simple structure of the lens driving device.

  For example, the lens driving device described in Patent Document 1 includes a motor and a rack member that meshes with the output shaft of the motor and extends in the optical axis direction of the lens, thereby reducing the size of the entire lens driving device. In addition, the lens driving device described in Patent Document 2 includes a motor, a rack member, and a spring that biases to prevent fitting backlash, thereby reducing the size of the lens driving device and preventing fitting backlash. ing.

JP-A-8-110460 Japanese Patent Laid-Open No. 7-14368

  However, in the lens driving devices described in Patent Documents 1 and 2, the rack member and the motor greatly protrude from the lens side portion when viewed from the front, so that the front projection size is large. Further, since the rack member extends in the optical axis direction, it is difficult to reduce the thickness. For this reason, the request | requirement of size reduction was not fully able to be satisfied. Furthermore, the lens driving device described in Patent Document 2 has a relatively large number of parts, which increases the cost of the spring mounting process and the like, and is difficult to reduce.

  Further, in the lens driving devices disclosed in Patent Documents 1 and 2, a looseness occurs between a lens holding member (lens frame) having an opening for holding a lens and a member that engages with the lens frame. The vertical line of the surface formed by the part may deviate from the optical axis. In the lens driving device according to Patent Document 2, the lens holding member is provided with a spring that urges the fitting back so as to prevent the fitting backlash, but this also can sufficiently prevent the lens holding member from being displaced due to the fitting backlash. There wasn't.

  The present invention has been made in view of the above-described problems, and aims to realize a lens driving device that is small and inexpensive, and that prevents a vertical line of a surface formed by an opening of a lens frame from shifting from the optical axis. To do.

In order to achieve the above object, a lens driving device according to the first aspect of the present invention provides:
A motor having a plurality of stop positions in rotation with an axis perpendicular to the optical axis of the lens as a rotation axis;
A drive lever provided on the rotor output shaft of the motor;
A lens holding member that is supported movably in the optical axis direction and holds the lens;
By engaging the drive lever and the lens holding member, following the drive lever, and swinging about an axis perpendicular to the optical axis as a rotation axis, the movement of the drive lever is changed in the optical axis direction of the lens. A transmission member that converts the movement and transmits the movement to the lens holding member;
With
The transmission member has elasticity, and is elastically deformed to urge the lens holding member in a direction perpendicular to the optical axis.
It is characterized by that.

A slide shaft extending along the optical axis direction;
The lens holding member has a guide hole through the slide shaft,
The transmission member may be urged so that an inner wall of the guide hole is in contact with the slide shaft.

  The lens holding member further includes a rotation restricting member that restricts a rotation operation, and the transmission member has an inner wall of the guide hole from the rotation restricting member in the guide hole direction or the opposite direction. It can also be urged to contact the slide shaft.

  The motor may be a swing motor.

  There may be two stop positions of the motor.

  According to the present invention, it is possible to realize a lens driving device that is small and inexpensive, and that prevents the vertical line formed by the opening of the lens frame from shifting from the optical axis.

(Embodiment 1)
A lens driving device according to Embodiment 1 of the present invention will be described below with reference to the drawings. As an example, a lens driving device that switches the shooting distance of the camera by moving the lens along the optical axis direction will be described.

  The lens driving device 10 according to the present embodiment is a lens driving device of a camera with a macro photography (close-up) function, for example, and includes a motor 11, a drive lever 13, a lens frame 15, a base 17, and the like shown in FIG. It is comprised from the transmission member 19 and the cover board 21 shown in FIG.

  Hereinafter, an axis (optical axis) parallel to the direction in which light enters the lens is defined as an X axis. The axis perpendicular to the X axis and perpendicular to the surface on which the transmission member 19 is attached is defined as the Y axis. An axis perpendicular to the X axis and the Y axis is taken as a Z axis.

  The motor 11 is a swing motor, for example, and includes a coil 111, a stator 113, and a rotor 115. The motor 11 is fixed to the side surface of the base 17 perpendicular to the Z axis so that the rotation axis of the rotor 115 is parallel to the Z axis. The coil 111 generates a magnetic field when energized. The stator 113 is a magnetic body around which the coil 111 is wound, and is excited by a magnetic field generated by the coil 111. The rotor 115 is a member that rotates around the rotor output shaft 1151 by a magnetic field generated by the stator 113. The rotor 115 is designed to stop at a plurality of predetermined positions when the stator 113 is excited and the motor 11 is not loaded. In the present embodiment, the movement range is limited by the contact of the lens frame 15 (described later) with the base 17 or the cover plate 21, so the actual stop position of the rotor 115 is a position between two detent positions. .

  2A and 2B are side views of the lens driving device 10 in which the motor 11 is disposed. As shown in FIGS. 2A and 2B, the stator 113 is formed in a U-shape, and the rotor 115 is formed in a cylindrical shape and is magnetized. When a current is supplied to the coil 111, the stator 113 is excited, and the rotor 115 rotates due to the interaction between the magnetic field generated by the stator 113 and the magnetic pole of the rotor 115.

  FIG. 2A is a side view of the lens driving device 10 when the coil 111 is energized so as to stop at a stop position corresponding to standard imaging. FIG. 2B is a side view of the lens driving device 10 when energized in the opposite direction to FIG. 2A so as to stop at a stop position corresponding to macro photography (close-up photography).

  As shown in FIG. 1, the drive lever 13 is a rod-like member that is fixed to the rotor output shaft of the rotor 115 and extends along the rotation axis direction of the rotor 115. The drive lever 13 is used to transmit the rotational torque of the motor 11 to the transmission member 19. The drive lever 13 moves according to the rotation of the rotor 115.

  The lens frame 15 is a cylindrical member and is used for holding a lens. FIG. 3A is a front view of the lens frame 15 viewed from the optical axis (X-axis) direction. As shown in FIG. 2A, the lens frame 15 includes a lens holding portion 151 at the center. The lens holding portion 151 is an opening formed to hold the lens L, and penetrates in the X-axis direction. The lens L held by the lens holding portion 151 is exposed to the front of the lens driving device 10. The lens frame 15 includes a guide hole 153 separately from the lens holding portion 151. The guide hole 153 is an opening that penetrates in the X-axis direction, and a slide shaft 171 described later is inserted into the guide hole 153. Further, the lens frame 15 includes a sub guide 155 on the side. The sub guide 155 protrudes in the Y-axis direction and is a part of the lens frame 15 that engages with the transmission member 19.

  FIG. 3B shows a side view of the lens frame 15 viewed from the Z-axis direction. As shown in FIG. 5B, the lens frame 15 includes 157a and 157b per degree between the guide hole 153 and the engaging portion of the lens frame 15 and the transmission member 19. 157 a per degree is a part of the lens frame 15 formed to protrude in the X-axis direction toward the front of the lens driving device 10. 157b per degree is a part of the lens frame 15 formed to protrude in the X-axis direction toward the back surface of the lens driving device 10. Then, the movement range in the X-axis direction of the lens frame 15 is restricted by contacting the cover plate 21 shown in FIG. 5 with the contact 157a or contacting the base 17 with the contact 157b. As shown in (b), the swing range of the rotor 115 is also restricted.

  FIG. 4 shows a front view of the lens driving device 10 as seen from the optical axis (X-axis) direction with the cover plate 21 removed. As shown in the figure, in the lens frame 15, the slide shaft 171 is inserted into the guide hole 153, and the sub guide 155 is projected through the opening on the side surface perpendicular to the Y axis of the base 17. It is attached to the base 17 so that it can move along the X-axis.

  5A and 5B are cross-sectional views of the lens driving device 10 viewed from the Z-axis direction. As shown in FIG. 5A, when the lens frame 15 moves toward the back of the lens driving device 10 along the optical axis (X axis) direction for standard shooting, The contact of the lens frame 15 restricts the movement of the lens frame 15 in the optical axis direction. On the other hand, when the lens frame 15 moves toward the front of the lens driving device 10 along the optical axis direction for macro photography (close-up photography), as shown in FIG. 21 makes contact with the lens frame 15 to restrict movement in the optical axis direction.

  As shown in FIGS. 5A and 5B, when the lens frame 15 and the base 17 or the cover plate 21 come into contact with each other, the contact points between the bases 157 and 157 b and the base 17 and the cover plate 21 are determined. The fulcrum F, the engagement point (155, 191) between the lens frame 15 and the transmission member 19 is the force point S, and the engagement point (153) between the lens frame 15 and the slide shaft 171 is the action point LD. In the present embodiment, the distance between the fulcrum F and the force point S is configured to be shorter than the distance between the fulcrum F and the action point LD. For this reason, when a load is applied to the force point S (155, 191), the load applied to the action point LD (153) is relatively small with respect to this load. Therefore, a loose fit due to a load applied to the guide hole 153 (the operating point LD) is unlikely to occur. For this reason, it is possible to prevent the perpendicular of the surface formed by the opening (151) of the lens frame 15 from deviating from the optical axis (X axis) due to the fitting backlash.

As shown in FIG. 1, the base 17 is a rectangular parallelepiped member having a hollow inside,
The motor 11, the lens frame 15, the transmission member 19, and the cover plate 21 are attached. An opening for exposing the lens L to the front surface of the lens driving device 10 is provided on a surface perpendicular to the optical axis (X axis) of the base 17. An opening for inserting the sub guide 155 of the lens frame 15 is provided on the side surface of the base 17 perpendicular to the Y axis. A slide shaft 171 is fixed inside the base 17. The slide shaft 171 is a rod-like member extending in the optical axis (X-axis) direction, and the lens frame 15 is attached to be movable in the X-axis direction by inserting the slide shaft 171 into the guide hole 153 of the lens frame 15. . Further, the coil 111 is attached to the surface of the base 17 perpendicular to the Z axis, and the transmission member 19 is attached to the surface of the base 17 perpendicular to the Y axis.

  The transmission member 19 is a plate-like member that is rotatably fixed to the side surface of the base 17 perpendicular to the Y axis, and converts the rotational torque of the drive lever 13 into a driving force in the X axis (optical axis) direction. , Transmitted to the lens frame 15. FIGS. 6A and 6B show the side surface of the lens driving device 10 with the cover plate 21 removed, to which the transmission member 19 is attached. FIG. 5A shows the stop position of the transmission member 19 corresponding to the standard photographing position. FIG. 5B shows the stop position of the transmission member 19 corresponding to the macro shooting (close-up) position.

  The transmission member 19 includes an engagement portion 191 having a bifurcated shape at one end, and a rotation shaft 195 at the other end. The transmission member 19 sandwiches the two ends of the engaging portion 191 or one end of the drive lever 13 and can rotate in the direction perpendicular to the rotation direction of the rotor 115 about the rotation shaft 195 as the axis. Mounted on the side perpendicular to the axis. The transmission member 19 includes an opening 193 penetrating in the Y-axis direction between the rotation shaft 195 and the engaging portion 191, and the sub guide 155 of the lens frame 15 is inserted into the opening 193.

  Here, in the present embodiment, at least one of the engagement portion between the transmission member 19 and the drive lever 13 and the engagement portion between the transmission member 19 and the lens frame 15 has a gap when engaged. Is designed to be formed. By providing these gaps, when switching the lens position, the torque required when the rotor 115 starts rotating is reduced.

  As shown in FIGS. 6A and 6B, when the drive lever 13 rotates with the transmission member 19 engaged with the drive lever 13 and the lens frame 15, the drive lever 13 and the transmission member 19 The engagement point (191) is the force point S, the rotation shaft 195 of the transmission member 19 is the fulcrum F, the engagement points (155, 193) of the lens frame 15 and the transmission member 19 are the action points LD, and the lens frame 15 is the optical axis. A driving force for moving in the (X-axis) direction is generated. The amount of movement of the lens frame 15 in the optical axis direction corresponding to the rotation angle of the rotor 115 is adjusted by the ratio of the distance from the fulcrum F to the force point S of the transmission member 19 and the distance from the fulcrum F to the action point LD (lever ratio). ) To adjust.

  The cover plate 21 is a member that is attached to the base 17 and covers a surface and a side surface of the base 17 on the front side of the apparatus. The cover plate 21 includes an opening. When the cover plate 21 is attached to the base 17, the lens is exposed from the opening to the front of the lens driving device 10. The cover plate 21 abuts on the lens frame 15 per degree 157a to restrict the movement of the lens frame 15 in the optical axis direction. Further, the cover plate 21 prevents dust and the like from entering the base 17. FIG. 7 shows a front view of the lens driving device 10 to which the cover plate 21 is attached as seen from the optical axis (X axis) direction. As shown in the figure, the cover plate 21 covers the front surface of the base 17 viewed from the X-axis direction except for the lens. Further, as shown in FIGS. 5A and 5B, the cover plate 21 covers the side surface of the base 17.

  With the above-described configuration, the drive lever 13 fixed to the rotor 115 rotates about an axis (Z axis) perpendicular to the optical axis (X axis) and the transmission member 19 engaged with the drive lever 13 is driven. The lever 13 rotates about an axis (Y axis) perpendicular to the rotation direction of the lever 13. Then, the lens frame 15 engaged with the transmission member 19 moves along the X-axis direction.

  Next, the operation of the lens driving device 10 will be described with reference to FIGS. The lens driving device 10 is electrically connected to, for example, a camera control device and controlled by the control device.

  When the control device of the camera controls the lens driving device 10 for standard imaging, the control device passes a current in one direction of the coil 111 of the motor 11, for example. The stator 113 is excited by the coil 111, and the rotor 115 and the drive lever 13 are rotated. As shown in FIG. 2A, the stop position closer to the rear surface of the lens driving device 10 out of the two stop positions. And move. Since the drive lever 13 has moved, the engaging portion 191 of the transmission member 19 that engages with the drive lever 13 also moves closer to the back surface of the lens driving device 10 as shown in FIG. Due to the movement of the engaging portion 191, as shown in FIG. 5A, the lens frame 15 that engages with the transmission member 19 moves to the back surface of the lens driving device 10 along the optical axis (X-axis) direction. To do. As shown in FIG. 6A, the movement of the lens frame 15 in the X-axis direction is restricted by the contact between the 157b and the base 17 per degree. When the lens L held by the lens frame 15 approaches the back surface of the lens driving device 10, standard photographing becomes possible.

  On the other hand, when the control device of the camera controls the lens driving device 10 in order to perform macro photography (close-up photography), for example, this control device is applied to the coil 111 of the motor 11 in the opposite direction to the case of FIG. Through the current. The stator 113 is excited by the coil 111, and the rotor 115 and the drive lever 13 are rotated. As shown in FIG. 4B, the stop position closer to the front of the lens driving device 10 out of the two stop positions. And move. As shown in FIG. 6B, the transmission member 19 that engages with the drive lever 13 moves the engagement portion 191 closer to the front of the lens driving device 10 due to the movement of the drive lever 13. Due to the movement of the engaging portion 191, as shown in FIG. 5B, the lens frame 15 engaged with the transmission member 19 faces the front of the lens driving device 10 along the optical axis (X axis) direction. Move. As shown in FIG. 6B, the movement of the lens frame 15 in the X-axis direction is restricted by the contact between the cover frame 21 and the cover frame 21 per 157a. When the lens L held by the lens frame 15 approaches the front of the lens driving device 10, macro photography (close-up photography) becomes possible.

  With the configuration described above, when the control device controls the motor 11, the lens driving device 10 moves the lens frame 15 along the optical axis (X-axis) direction to control the lens position of the camera.

  In the lens driving device 10 according to the present invention, as shown in FIG. 1, the rotor output shaft 1151 of the rotor 115 and the rotation shaft 195 of the transmission member 19 are perpendicular to the optical axis (X axis), and the lens frame 15 is mounted. It is the structure provided in the mutually orthogonal surface which encloses. Since the rotor 115 rotates with the rotor output shaft 1151 perpendicular to the optical axis (X axis) as the rotation axis, the rotor 115 has a cylindrical side surface on the front surface (surface viewed from the X axis direction) of the lens driving device 10. Therefore, the front projection size of the lens driving device 10 is smaller than the conventional size. Further, since the transmission member 19 extends in a direction substantially perpendicular to the X axis, it is thinner than a conventional lens driving device. For this reason, the lens drive device 10 is small as a whole. Furthermore, since the number of parts is relatively small and the structure is simple, the manufacturing cost can be kept low.

  Further, the rotor 115 stops at a predetermined position between the detent positions by the contact of the lens frame 15 with the 157a and 157b and the base 17 and the cover plate 21. For this reason, the rotational torque (detent torque) of the rotor 115 to the detent position when the lens position is switched loosens the engagement of the members. Therefore, there is no backlash at the stop position of the rotor 115, and the stop position accuracy of the lens driving device 10 is improved.

  As shown in FIGS. 5A and 5B, when the lens driving device 10 according to the present embodiment is in contact with the base 17 and the cover plate 21 per degree, the contact portions of these lenses 157a and 157b are in contact with each other. Is the fulcrum F, the engagement point between the lens frame 15 and the transmission member 19 is the force point S (155, 191), and the engagement point (153) between the lens frame 15 and the slide shaft 171 is the action point LD. The distance to S is configured to be shorter than the distance between the fulcrum F and the action point LD. Therefore, due to the lever principle, the load applied to the action point LD (153) is relatively small with respect to the load applied to the force point S (155, 191), and the opening (151) of the lens frame 15 is caused by the fitting backlash. ) Is prevented from deviating from the optical axis (X axis).

  On the other hand, as shown in FIG. 8, the distance between the lens frame 15 and the transmitting portion 19 (force S) is set to 157a, 157b (fulcrum) per degree as shown in FIG. F), the point of action LD (153) with respect to the load applied to the force point S (155, 191) due to the lever principle when it is longer than the engagement point (action point LD) of the lens frame 15 and the slide shaft 171. ) Is relatively large. In this case, fitting backlash between the lens frame 15 and the slide shaft 171 occurs, and the perpendicular of the surface formed by the opening (151) of the lens frame 15 is deviated from the optical axis (X axis).

  A gap is formed in at least one of the engagement portion between the transmission member 19 and the drive lever 13 and the engagement portion between the transmission member 19 and the lens frame 15. These gaps reduce the torque required when the rotor 115 starts to rotate. For this reason, a small motor having a smaller torque than the conventional one can be used for the motor 11, and the lens driving device 10 can be further downsized.

(Embodiment 2)
A lens driving device according to Embodiment 2 of the present invention will be described. In the lens driving device 10 according to the first embodiment of the present invention, the rotor output shaft 1151 of the motor 11 and the rotation shaft 195 of the transmission member 19 are perpendicular to the optical axis (X axis) and surround the lens frame 15. Although arranged above, the present invention is not limited to such a configuration. The rotor output shaft 1151 and the rotation shaft 195 may be arranged on two parallel planes that are perpendicular to the optical axis (X axis) and surround the lens frame 15. In the lens driving device 10a according to the second embodiment of the present invention, the rotor output shaft (1151) and the rotation shaft (195) are arranged on two parallel planes that are perpendicular to the optical axis and surround the lens frame 15, respectively. It is characterized by doing.

  9A is a front view of the lens driving device 10a with the cover plate 21 removed according to the present embodiment, and FIG. 9B is a side view of the lens driving device 10a with the cover plate 21 removed as viewed from the Z-axis direction. The figure is shown. The lens driving device 10a according to the present embodiment has the same configuration as the lens driving device 10 according to the first embodiment except that the driving lever 13 is replaced with a driving lever 13a and the transmission member 19 is replaced with a transmission member 19a.

  As shown in FIG. 2A, the rotor 115 is disposed on the side surface of the base 17 perpendicular to the Z axis, and the transmission member 19a is disposed on the side surface of the base 17 facing this surface. One end of the drive lever 13a extends along a surface orthogonal to the surface on which the motor 11 is provided, and engages with the transmission member 19a at the tip. As shown in FIG. 9B, the transmission member 19a is fixed to a surface parallel to the surface on which the motor 11 is provided.

  With the above-described configuration, when the rotor 115 and the drive lever 13a rotate about the rotor output shaft 1151 parallel to the Z axis as the rotation axis, the transmission member 19a engaged with the drive lever 13a rotates in the same direction as the rotation direction of the rotor 115. To do. The rotation of the transmission member 19a moves the lens frame 15 engaged with the transmission member 19a along the X-axis direction.

  According to the lens driving device according to the present embodiment, the lens driving device can be made small and inexpensive. Further, since the rotation direction of the rotor 115 and the rotation direction of the transmission member 19a are the same, the transmission of the rotational torque by the transmission member 19a becomes smooth.

(Embodiment 3)
A lens driving device according to Embodiment 3 of the present invention will be described. In the lens driving device 10 according to the first embodiment of the present invention, the rotor output shaft (1151) and the rotation shaft (195) are perpendicular to the optical axis (X axis) and are orthogonal to each other surrounding the lens frame 15. However, the present invention is not limited to such a configuration. The rotor output shaft 1151 and the rotation axis (195) may be arranged on the same plane that is perpendicular to the optical axis (X axis) and surrounds the lens frame 15. The lens driving device 10b according to Embodiment 3 of the present invention is characterized in that the rotor output shaft 1151 and the rotation shaft 195 are arranged on the same plane that is perpendicular to the optical axis (X axis) and surrounds the lens frame 15. To do.

  10A is a front view of the lens driving device 10b with the cover plate 21 removed according to the present embodiment, and FIG. 10B is a side view of the lens driving device 10b with the cover plate 21 removed as viewed from the Z-axis direction. The figure is shown. The lens driving device 10b according to the present embodiment is the same as the lens driving device 10 according to the first embodiment except that the motor 11 is replaced with the motor 11b, the driving lever 13 is replaced with the driving lever 13b, and the transmission member 19 is replaced with the transmission member 19b. It is the same composition as.

  As shown in FIGS. 10A and 10B, the motor 11b, the drive lever 13b, and the transmission member 19b are arranged on the same plane perpendicular to the Z axis.

  With the above-described configuration, when the motor 11b and the drive lever 13b rotate about the rotor output shaft 1151b parallel to the Z axis as the rotation axis, the transmission member 19b engaged with the drive lever 13b is predetermined in the direction opposite to the rotation direction of the rotor 115. Rotate the angle. The rotation of the transmission member 19b moves the lens frame 15 engaged with the transmission member 19b along the X-axis direction.

  According to the lens driving device according to the present embodiment, the lens driving device can be made small and inexpensive. Moreover, since the motor 11b and the transmission member 19b are on the same side surface, the assemblability is improved.

(Embodiment 4)
The transmission member 19 may be a member having elasticity. The lens driving device 10c according to the fourth embodiment of the present invention uses an elastic transmission member.

  The lens driving device 10c according to the present embodiment has the same configuration as the lens driving device 10 according to the first embodiment, except that the transmission member 19c is provided instead of the transmission member 19. FIG. 11 shows a front view of the lens driving device 10c as viewed from the X-axis direction with the cover plate 21 removed. The transmission member 19c used in the lens driving device 10c is an elastic member (for example, rubber). Further, in the transmission member 19c, an opening 193c through which the sub guide 155 is inserted is a blind hole in order to easily bias the lens frame 15 in the Y-axis direction. Other configurations are the same as those of the transmission member 19.

  As shown in FIG. 11, the transmission member 19 c is attached in a state of being biased so as to bend in the Y-axis direction toward the inside of the base 17. Due to the elastic deformation of the transmission member 19c, a load is applied to the lens frame 15 in the Y-axis direction toward the inside of the base 17, and the lens frame 15 and the slide shaft 171 come into contact with each other due to this load (elastic force).

  According to the lens driving device 10c according to the present embodiment, even if there is a fit between the lens frame 15 and the slide shaft 171, there is an elastic force of the transmission member 19c, so that the opening (151) of the lens frame 15 is provided. The formed surface is maintained so as to be perpendicular to the optical axis (X axis). Therefore, the perpendicular of the surface formed by the opening (151) of the lens frame 15 is prevented from deviating from the X axis.

  In the above-described embodiment, it is assumed that the lens driving device according to the present invention is incorporated in the camera and used for switching the shooting distance. However, the present invention is not limited to the camera, and the lens driving device such as a mobile phone or a printer. Needless to say, the present invention can be applied to other apparatuses including the above.

  Further, the motor 11 of the lens driving device is not limited to a swing motor. Further, the detent position of the motor 11 and the stop position of the drive lever 13 are not limited to two, and may be three or more.

  The shape of the engaging portion between the drive lever 13 and the transmission member 19 is not limited to the shape shown in the above embodiment. For example, the drive lever 13d provided with the sub guide 131d protruding in the Y-axis direction while being attached to the side portion of the rotor 115 may be used. FIG. 12A shows a side view of the drive lever 13d viewed from the Y-axis direction. FIG. 12B shows a side view of the drive lever 13d viewed from the X-axis (optical axis) direction. In this case, in addition to the rotating shaft 195d and the opening 193d, a transmission member 19d having an opening 191d that engages with the sub guide 131d of the drive lever 13d is used. FIG. 13A shows a side view of the lens driving device using the driving lever 13d and the transmission member 19d as seen from the Y-axis direction. FIG. 13B shows a side view of the lens driving device using the driving lever 13d and the transmission member 19d and with the cover plate 21 removed, as viewed from the X-axis direction.

  In addition to the transmission member 19, an elastic member (spring or the like) may be provided, and the elastic member may be configured to urge the perpendicular of the surface formed by the opening (151) of the lens frame 15 so as not to deviate from the optical axis. .

  Furthermore, the driving force of an actuator other than the motor can be used as the power for moving the drive lever. For example, an electrostrictive polymer or a shape memory alloy can be used to move the drive lever.

It is a perspective view of the lens drive device concerning Embodiment 1 of the present invention. (A) It is a side view of the lens drive device by which the motor based on Embodiment 1 of this invention is arrange | positioned. (B) It is a side view of the lens drive device by which the motor based on Embodiment 1 of this invention is arrange | positioned. (A) It is the front view seen from the X-axis direction of the lens frame which concerns on Embodiment 1 of this invention. (B) It is the side view seen from the Z-axis direction of the lens frame which concerns on Embodiment 1 of this invention. It is the front view seen from the X-axis direction of the lens drive device concerning Embodiment 1 of the present invention in the state where the cover board was removed. (A) It is sectional drawing seen from the Z-axis direction of the lens drive device which concerns on Embodiment 1 of this invention. (B) It is sectional drawing seen from the Z-axis direction of the lens drive device which concerns on Embodiment 1 of this invention. (A) It is the side view seen from the Y-axis direction in the state which removed the cover board of the lens drive device which concerns on Embodiment 1 of this invention. (B) It is the side view seen from the Y-axis direction in the state which removed the cover board of the lens drive device which concerns on Embodiment 1 of this invention. It is the front view seen from the X-axis direction of the lens drive device concerning Embodiment 1 of the present invention. It is sectional drawing seen from the Z-axis direction of the lens drive device which concerns on a comparative example. (A) It is the front view seen from the X-axis direction in the state which removed the cover board of the lens drive device which concerns on Embodiment 2 of this invention. (B) It is the side view seen from the Z-axis direction in the state which removed the cover board of the lens drive device which concerns on Embodiment 2 of this invention. (A) It is the front view seen from the X-axis direction in the state which removed the cover board of the lens drive device which concerns on Embodiment 3 of this invention. (B) It is the side view seen from the Z-axis direction in the state which removed the cover board of the lens drive device which concerns on Embodiment 3 of this invention. It is the side view seen from the X-axis direction in the state where the cover board was removed of the transmission member concerning Embodiment 4 of the present invention. (A) It is the side view seen from the Y-axis direction of the drive lever provided with the sub guide. (B) It is the side view seen from the X-axis direction of the drive lever provided with the sub guide. (A) It is the side view seen from the Y-axis direction of the drive lever provided with the sub guide, and a transmission member. (B) It is the side view seen from the X-axis direction of the drive lever provided with the sub guide, and a transmission member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Lens drive device 11 Motor 111 Coil 113 Stator 115 Rotor 13 Drive lever 15 Lens frame 151 Lens holding part 153 Guide hole 155 Sub guide 157a, 157b per degree 17 Base 171 Slide shaft 19 Transmission member 191 Engagement part 193 Opening part 195 Rotation Shaft 21 Cover plate

Claims (5)

A motor having a plurality of stop positions in rotation with an axis perpendicular to the optical axis of the lens as a rotation axis;
A drive lever provided on the rotor output shaft of the motor;
A lens holding member that is supported movably in the optical axis direction and holds the lens;
By engaging the drive lever and the lens holding member, following the drive lever, and swinging about an axis perpendicular to the optical axis as a rotation axis, the movement of the drive lever is changed in the optical axis direction of the lens. A transmission member that converts the movement and transmits the movement to the lens holding member;
With
The transmission member has elasticity, and is elastically deformed to urge the lens holding member in a direction perpendicular to the optical axis.
A lens driving device. A slide shaft extending along the optical axis direction;
The lens holding member has a guide hole through the slide shaft,
The transmission member urges the inner wall of the guide hole to abut against the slide shaft.
The lens driving device according to claim 1. The lens holding member further includes a rotation restricting member that restricts a rotation operation, and the transmission member has an inner wall of the guide hole from the rotation restricting member in the guide hole direction or the opposite direction. Energize to contact the slide shaft,
The lens driving device according to claim 2.   The lens driving device according to claim 1, wherein the motor is a swing motor.   The lens driving device according to claim 1, wherein the motor has two stop positions.

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