JP5824338B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device mounted on a relatively small camera used in a mobile phone or the like.

  2. Description of the Related Art Conventionally, a lens driving device that drives a photographing lens of a camera mounted on a mobile phone or the like is known (for example, see Patent Document 1). The lens driving device described in Patent Document 1 includes a moving body that holds a lens, a support that holds the moving body in the optical axis direction of the lens, and a drive mechanism that drives the moving body in the optical axis direction. I have. The support body includes a substantially bottomed rectangular cylindrical case that is disposed on the outer peripheral side of the moving body and the driving mechanism and forms the side surface of the lens driving device, and a base that forms an end surface on the side opposite to the subject of the lens driving device. Yes.

  The bottom of the case formed in a substantially bottomed rectangular tube shape constitutes the subject-side end surface of the lens driving device. An opening that penetrates in the optical axis direction is formed at the bottom of the case. A through hole penetrating in the optical axis direction is formed at the center of the base. In a camera in which the lens driving device described in Patent Document 1 is mounted, an IR cut filter that transmits visible light and cuts near-infrared light in the through-hole or on the side opposite the subject from the through-hole. And an image sensor. A stopper portion for determining the reference position of the moving body in the optical axis direction is formed on the surface on the subject side of the base so as to protrude toward the subject side, and the protrusion formed on the moving body is the object side of the stopper portion. The reference position of the moving body in the optical axis direction is determined by contacting the surface. In addition, a dust storage recess that is recessed toward the non-subject side is formed between the through hole and the stopper portion on the subject side surface of the base.

  In this lens driving device, dust that can be generated when the protrusion of the moving body and the stopper portion of the base come into contact with each other is accumulated in the dust storage recess. Therefore, in this lens driving device, it is possible to prevent dust that may be generated when the protrusion of the moving body and the stopper portion of the base come into contact with the image sensor or the IR cut filter through the through-hole. Thus, it is possible to prevent the occurrence of black spots or the like due to dust in an image taken by a camera equipped with a lens driving device.

JP 2010-190923 A

  In the lens driving device described in Patent Document 1, in order to ensure the amount of movement of the moving body in the optical axis direction, the space between the bottom of the case constituting the subject-side end surface of the lens driving device and the subject-side end surface of the moving body. A gap is formed in Therefore, in this lens driving device, dust may enter the lens driving device through this gap. As described above, in the lens driving device described in Patent Document 1, dust that may be generated when the protrusion of the moving body and the stopper portion of the base come into contact with each other passes through the through-hole and adheres to the image sensor and the IR cut filter. Considerations have been made to prevent this. However, in this lens driving device, it is sufficient to prevent dust that has entered the lens driving device from the gap between the bottom of the case and the end surface on the subject side of the moving body from adhering to the image sensor or the IR cut filter. No consideration has been given.

  Accordingly, an object of the present invention is a lens driving device having a substantially square shape when viewed from the optical axis direction of the lens, and driving the lens from between a subject-side end surface portion of the lens driving device and a movable body. An object of the present invention is to provide a lens driving device capable of preventing dust that has entered the inside of the device from adhering to an image sensor or an IR cut filter.

In order to solve the above-described problems, the lens driving device of the present invention is a lens driving device having a substantially square shape when viewed from the optical axis direction of the lens, and can hold the lens and move in the optical axis direction. A movable body, a fixed body that holds the movable body movably in the optical axis direction, and a drive mechanism that drives the movable body in the optical axis direction. The drive mechanism is wound around the outer peripheral surface of the movable body. The driving body includes a driving coil, the fixed body includes a cover member that covers the outer peripheral side of the movable body and the driving mechanism, and a base member that forms an end surface on the side opposite to the subject of the lens driving device. A hook that includes three extended portions extending in a substantially orthogonal direction and toward each of the three corners of the lens driving device , and hooks a part of the driving coil routed from the non-subject side. On the subject side of the movable body The protrusion portion protrudes in a direction substantially orthogonal to the optical axis direction and toward the remaining one of the four corners of the lens driving device in which the extension portion is not formed. The remaining one of the four corners of the lens driving device in which the through-hole penetrating in the optical axis direction is not formed and the object-side surface of the base member rises toward the object side. The first wall portion is formed on the subject side surface of the base member so as to surround the through hole and rise toward the subject side. The second wall portion is higher than the second wall portion .

When the shape of the lens driving device when viewed from the optical axis direction of the lens is a substantially square shape, spaces are easily formed at the four corners inside the lens driving device, so the end surface on the subject side of the lens driving device Dust that has entered the inside of the lens driving device from between the part and the movable body passes through the inside of the cover member at the four corners of the lens driving device, and is opposite to the lens driving device in which the imaging element and the IR cut filter are arranged. Easy to move to the subject side. However, in the present invention, the movable body includes three expansion portions that extend in a direction substantially perpendicular to the optical axis direction and toward each of the three corners of the lens driving device. It is possible to reduce the gap between the movable body and the cover member at three of the four corners of the drive device. Therefore, in the present invention, the extension portion suppresses the dust that has entered the inside of the lens driving device from between the end surface portion on the subject side of the lens driving device and the movable body from moving toward the non-subject side of the lens driving device. As a result, it is possible to prevent dust that has entered the inside of the lens driving device from between the end surface portion on the subject side of the lens driving device and the movable body from adhering to the image sensor or the IR cut filter. It becomes possible. Further, according to the present invention, the movable body includes a hook portion on the subject side of the movable body that hooks a part of the driving coil drawn from the opposite subject side, and the hook portion extends in a direction substantially orthogonal to the optical axis direction. And it protrudes toward the remaining one of the four corners of the lens driving device in which no extension is formed. For this reason, the driving coil can be wound around the outer peripheral surface of the movable body while a part of the driving coil drawn from the non-subject side is hooked on the hook portion, and the driving coil can be wound from the subject side of the movable body. It becomes possible to wind the drive coil in an orderly manner toward the subject side. Therefore, the winding operation of the driving coil is facilitated. Further, since the hook portion protrudes in a direction substantially perpendicular to the optical axis direction and toward the remaining one of the four corners of the lens driving device where the extension portion is not formed, the extension portion is formed. Even at one of the four corners of the lens driving device that is not, the gap between the movable body and the cover member can be reduced to prevent dust from moving to the opposite side of the lens driving device. Furthermore, in the present invention, the first wall portion that rises toward the subject side is formed on the subject side surface of the base member at the remaining one of the four corners of the lens driving device in which the extension portion is not formed. ing. Accordingly, the dust temporarily moves to the base member at one of the four corners of the lens driving device where the hook portion formed smaller than the extension portion is arranged to route the driving coil from the opposite subject side to the subject side. Even so, the first wall portion can prevent the dust from passing through the through-hole and adhering to the image sensor or the IR cut filter. Furthermore, in the present invention, the second wall portion that surrounds the through-hole and rises toward the subject side is formed on the subject side surface of the base member. In this case, even if the dust moves to the base member, the second wall portion can prevent the dust from passing through the through hole and adhering to the image sensor or the IR cut filter. In the present invention, since the first wall portion is higher than the second wall portion, the second wall portion formed so as to surround the through hole and the movable body moving in the optical axis direction It becomes easy to prevent interference.

  In the present invention, the extension portion is preferably formed on the subject side of the movable body. With this configuration, the dust that enters the inside of the lens driving device from between the end surface portion on the subject side of the lens driving device and the movable body moves to the opposite side of the lens driving device on the subject side of the movable body. It becomes possible to suppress. Also, with this configuration, the lens driving device can be easily assembled on the side opposite to the subject of the lens driving device.

In the present invention, extension unit, for example, is formed in a plate shape. In this case, compared with the case where the extension portion is formed in a block shape, the extension portion is less likely to become an obstacle when the drive coil is wound. Therefore, the winding operation of the driving coil is facilitated.

In the present invention, the drive mechanism includes a plate-shaped actuating magnets are arranged along the four sides of the cover member which is formed into a substantially square tube shape, the driving magnets, the opposing portion facing the driving coil And a non-facing portion that extends from the facing portion toward two adjacent corners of the four corners of the lens driving device. If comprised in this way, it will become possible to narrow the space which is easy to be formed in the four corners inside a lens drive device using the non-opposing part of a drive magnet. Accordingly, it is possible to effectively suppress the dust that has entered the inside of the lens driving device from between the end surface portion on the subject side of the lens driving device and the movable body from moving to the opposite side of the lens driving device. Become.

  In the present invention, it is preferable that the extended portion is formed with a notch for preventing interference between the extended portion and the driving magnet when the movable body rotates with the optical axis direction as the axial direction. If comprised in this way, even if it is a case where the expansion part is formed in the movable body and the non-opposing part is formed in the drive magnet, it is possible to prevent interference between the movable body and the drive magnet. become.

  In the present invention, the lens driving device includes a plate spring that connects the movable body and the fixed body on the subject side of the movable body, and the fixed body is a substantially rectangular frame-shaped spring fixing member to which a part of the plate spring is fixed. The spring fixing member includes protrusions that are arranged at the four corners of the lens driving device and extend toward the opposite object side, and the protrusions are formed between the end surfaces of the driving magnets adjacent in the circumferential direction of the lens driving device. It is preferable to arrange in the gap. If comprised in this way, it will become possible to fill the clearance gap formed between the end surfaces of the drive magnet adjacent in the circumferential direction of a lens drive device with a projection part. Accordingly, it is possible to effectively suppress the dust that has entered the inside of the lens driving device from between the end surface portion on the subject side of the lens driving device and the movable body from moving to the opposite side of the lens driving device. Become.

  In the present invention, it is preferable that at least a part of a gap formed between the end surfaces of the driving magnets adjacent in the circumferential direction of the lens driving device is filled with an adhesive. If comprised in this way, it will become possible to fill the clearance gap formed between the end surfaces of the drive magnet adjacent in the circumferential direction of a lens drive device with an adhesive agent. Accordingly, it is possible to effectively suppress the dust that has entered the inside of the lens driving device from between the end surface portion on the subject side of the lens driving device and the movable body from moving to the opposite side of the lens driving device. Become. Moreover, if comprised in this way, it will become possible to raise the fixing strength of the magnet for a drive to a cover member.

  In the present invention, the drive mechanism includes two drive coils that are wound around the movable body with a predetermined interval in the optical axis direction, and between the two drive coils of the movable body. It is preferable that a first protrusion that protrudes in a direction substantially orthogonal to the optical axis direction and toward the remaining one of the four corners of the lens driving device in which the extension portion is not formed is formed. . Further, in the present invention, the movable body protrudes toward the remaining one of the four corners of the lens driving device in which the extension portion is not formed on the opposite side of the movable body in a direction substantially orthogonal to the optical axis direction. It is preferable that the 2nd protrusion part to be formed is formed. With this configuration, in order to route the driving coil from the non-subject side to the subject side, even if the hook portion is formed smaller than the extension portion, one of the four corners of the lens driving device where the extension portion is not formed is provided. In this case, it is possible to effectively suppress the movement of dust to the side opposite to the subject of the lens driving device by the first protrusion and the second protrusion.

  In the present invention, for example, a reference concave portion for determining the reference position of the movable body in the optical axis direction is formed on the subject side surface of the base member so as to be depressed toward the opposite subject side, and the bottom surface of the reference concave portion is movable. The body abuts and serves as a reference plane that determines the reference position of the movable body in the optical axis direction, and the second wall portion constitutes the side surface of the reference recess.

In the present invention, the base over scan member, in the optical axis direction, is a cover member fixed surface overlapping the opposite-to-object side end surface of the cover member which is formed into a substantially square tube shape are formed, in the cover member fixing surface, the cover It is preferable that a convex portion having a contact surface that contacts the end surface of the member on the side opposite to the subject is formed so as to protrude toward the subject. If comprised in this way, it will become easy to ensure the flatness and dimensional accuracy of a contact surface compared with the case where the whole cover member fixing surface contacts the end surface of the cover member on the non-subject side. Therefore, it is possible to suppress the inclination of the cover member with respect to the base member. Moreover, it becomes easy to ensure the dimensional accuracy of the lens driving device in a state where the base member and the cover member are fixed. Further, with this configuration, an adhesive reservoir in which an adhesive for fixing the cover member and the base member accumulates in a gap formed between the cover member fixing surface and the end surface of the cover member on the side opposite to the subject. It can be. Therefore, it is possible to prevent the adhesive from protruding from the joint portion between the cover member and the base member.

  As described above, according to the present invention, in the lens driving device in which the shape when viewed from the optical axis direction of the lens is a substantially square shape, the lens driving device is interposed between the object-side end surface portion of the lens driving device and the movable body. It is possible to prevent dust that has entered the inside of the image sensor from adhering to the image sensor and the IR cut filter.

It is a perspective view of the lens drive device concerning an embodiment of the invention. It is sectional drawing of the EE cross section of FIG. It is a disassembled perspective view of the lens drive device shown in FIG. It is a top view which extracts and shows the drive coil and drive magnet of the lens drive device shown in FIG. FIG. 4 is a perspective view showing the sleeve shown in FIG. 3 from the subject side. FIG. 4 is a perspective view showing the sleeve shown in FIG. 3 from the non-subject side. It is a top view of the state which removed the cover member, the spacer, and the leaf | plate spring from the lens drive device shown in FIG. FIG. 4 is a perspective view showing the base member shown in FIG. 3 from the subject side. FIG. 4 is a perspective view showing a state in which the base member shown in FIG. 3 is rotated about 180 ° around the optical axis. FIG. 2 is a perspective view showing a state where a cover member is removed from the lens driving device shown in FIG. 1.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Schematic configuration of lens driving device)
FIG. 1 is a perspective view of a lens driving device 1 according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line EE of FIG. FIG. 3 is an exploded perspective view of the lens driving device 1 shown in FIG. FIG. 4 is a plan view showing the driving coil 15 and the driving magnet 17 extracted from the lens driving device 1 shown in FIG. In the following description, as shown in FIG. 1 and the like, the three directions orthogonal to each other are defined as an X direction, a Y direction, and a Z direction. The X direction is the left-right direction, the Y direction is the front-rear direction, and the Z direction is the up-down direction. Also, the X1 direction side is the “right” side, the X2 direction side is the “left” side, the Y1 direction side is the “front” side, the Y2 direction side is the “rear (back)” side, the Z1 direction side is the “upper” side, The Z2 direction side is the “lower” side.

  The lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone, a drive recorder, a surveillance camera system, or the like, and is formed in a substantially quadrangular prism shape as a whole as shown in FIG. Has been. Specifically, the lens driving device 1 is formed so that the shape of the lens for photographing when viewed from the direction of the optical axis L (optical axis direction) is a substantially square shape. In this embodiment, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is substantially square. The four side surfaces of the lens driving device 1 are substantially parallel to the left-right direction or the front-rear direction.

  In this embodiment, the Z direction (vertical direction) is substantially coincident with the optical axis direction. In addition, in a camera equipped with the lens driving device 1 of the present embodiment, an imaging element (not shown) is arranged on the lower side, and a subject arranged on the upper side is photographed. That is, in this embodiment, the upper side (Z1 direction side) is the subject side (object side), and the lower side (Z2 direction side) is the anti-subject side (imaging element side, image side).

  As shown in FIGS. 1 and 2, the lens driving device 1 includes a movable body 2 that holds a photographing lens and is movable in the optical axis direction, and a fixed body that holds the movable body 2 so as to be movable in the optical axis direction. 3 and a drive mechanism 4 for driving the movable body 2 in the optical axis direction. Moreover, the lens drive device 1 includes leaf springs 5 and 6 that connect the movable body 2 and the fixed body 3 as shown in FIGS. That is, the movable body 2 is movably held by the fixed body 3 via the leaf springs 5 and 6. In this embodiment, one leaf spring 5 is disposed on the upper end side of the movable body 2, and two leaf springs 6 are disposed on the lower end side of the movable body 2.

  The movable body 2 includes a sleeve 8 that holds a lens holder 7 to which a plurality of lenses are fixed. The fixed body 3 includes a cover member 10 that constitutes the upper end portion of the side surface of the lens driving device 1, a base member 11 that constitutes the lower end portion of the side surface of the lens driving device 1 and the lower end surface of the lens driving device 1, and a plate And a spacer 12 to which a part of the spring 5 is fixed. The base member 11 is fixed with a pair of power supply terminals 13 for supplying a current to a drive coil 15 (described later) constituting the drive mechanism 4.

  The lens holder 7 is formed in a substantially cylindrical shape. A plurality of lenses having a substantially circular shape when viewed from above and below are fixed to the inner peripheral side of the lens holder 7. A male screw is formed on the outer peripheral surface of the lens holder 7. In FIGS. 2 and 3, the lens holder 7 is not shown.

  The sleeve 8 is made of a resin material. The sleeve 8 is formed in a substantially cylindrical shape. Specifically, the sleeve 8 has a substantially circular shape on the inner peripheral surface when viewed from the vertical direction, and a substantially circular shape on the upper end side of the outer peripheral surface when viewed from the vertical direction. The shape on the lower end side of the outer peripheral surface when viewed from above and below is formed in a substantially cylindrical shape having a substantially square shape. At the lower end of the sleeve 8, an abutting surface 8a that abuts a later-described reference surface 11b formed on the base member 11 is formed so as to be substantially orthogonal to the optical axis direction. Specifically, four contact surfaces 8a are formed at substantially the center position of the lower end of the sleeve 8 in the front-rear direction and the left-right direction and at a pitch of about 90 °. A more specific configuration of the sleeve 8 will be described later.

  The cover member 10 is made of a magnetic material. Moreover, the cover member 10 is formed in the substantially square cylinder shape with the bottom which has the bottom part 10a and the cylinder part 10b. The bottom portion 10 a is disposed on the upper side and constitutes the upper end surface of the lens driving device 1. At the center of the bottom 10a, an opening 10c that penetrates the bottom 10a is formed. The cover member 10 covers the outer peripheral side of the movable body 2 and the drive mechanism 4.

  The base member 11 is formed of a resin material. The base member 11 is formed in a block shape having a substantially square shape when viewed from the optical axis direction. The base member 11 is attached to the lower end side of the cover member 10. A through hole 11 a is formed at the center of the base member 11. A reference surface 11b for determining the reference position of the movable body 2 in the optical axis direction is formed on the upper surface of the base member 11 so as to be substantially orthogonal to the optical axis direction. Specifically, four reference surfaces 11b are formed at approximately the center position of the upper surface of the base member 11 in the front-rear direction and the left-right direction and at a pitch of approximately 90 °. The contact surface 8a of the sleeve 8 can come into contact with the reference surface 11b. A more specific configuration of the base member 11 will be described later.

  The spacer 12 is formed of, for example, a resin material and is formed in a substantially square flat block shape. The spacer 12 is formed in a substantially square frame shape, and a through hole is formed at the center thereof. The spacer 12 is fixed to the lower surface of the bottom 10 a of the cover member 10. The detailed configuration of the spacer 12 will be described later.

  The leaf spring 5 connects the annular movable body fixing portion fixed to the upper end side of the sleeve 8, the four fixed body fixing portions fixed to the spacer 12, and the movable body fixing portion and the fixed body fixing portion. 4 arms. The leaf spring 5 is fixed to the sleeve 8 and the spacer 12 so that the thickness direction and the vertical direction substantially coincide with each other. In this embodiment, when no current is supplied to a driving coil 15 (to be described later) that constitutes the driving mechanism 4, the contact surface 8 a of the sleeve 8 and the reference surface 11 b of the base member 11 come into contact with each other, thereby moving the movable body 2. The leaf spring 5 is fixed to the sleeve 8 and the spacer 12 in a bent state so as to be arranged at a predetermined reference position.

  The plate spring 6 includes two movable body fixing portions fixed to the lower end side of the sleeve 8, two fixed body fixing portions fixed to the base member 11, and two connecting the movable body fixing portion and the fixed body fixing portion. Arm. The leaf spring 6 is fixed to the sleeve 8 and the base member 11 so that the thickness direction and the vertical direction substantially coincide with each other. Further, the plate spring 6 is configured so that the urging force by the plate spring 6 is not generated on the movable body 2 when the contact surface 8a of the sleeve 8 and the reference surface 11b of the base member 11 are in contact. It is fixed to the member 11.

  The power supply terminal 13 is formed by bending a flat metal material. The power supply terminal 13 is fixed to the base member 11. A part of the leaf spring 6 is fixed to the power supply terminal 13 by soldering or the like.

  The drive mechanism 4 includes two drive coils 15 wound around the outer peripheral surface of the sleeve 8, and four drive magnets 17 disposed along each of the four side surfaces of the lens drive device 1. ing.

  The two drive coils 15 are wound around the outer peripheral surface of the sleeve 8 with a predetermined interval in the vertical direction. The two drive coils 15 are formed by sequentially winding one conductive wire around the outer peripheral surface of the sleeve 8. In this embodiment, first, the upper drive coil 15 is formed, and then the lower drive coil 15 is formed. Further, the winding direction of the upper driving coil 15 is different from the winding direction of the lower driving coil 15. Each of the both ends of the conducting wire constituting the two driving coils 15 is fixed to each of the two leaf springs 6 by soldering or the like.

  A portion of the outer peripheral surface of the sleeve 8 around which the driving coil 15 is wound (that is, a wound portion 8e described later) is formed to have a substantially octagonal shape when viewed from above and below. The driving coil 15 is wound in a substantially octagonal cylindrical shape. As shown in FIG. 4, portions of the drive coil 15 that are substantially parallel to the front-rear direction or the left-right direction (that is, portions disposed along the four side surfaces of the cylindrical portion 10 b of the cover member 10) are drive magnets. 17 is opposed. That is, a portion of the driving coil 15 that is parallel to the front-rear direction or the left-right direction is a facing portion 15 a that faces the driving magnet 17. On the other hand, portions of the driving coil 15 disposed at the four corners of the lens driving device 1 that are inclined with respect to the front-rear direction and the left-right direction are non-opposing portions that do not face the driving magnet 17.

  The drive magnet 17 is formed in a substantially rectangular flat plate shape. This driving magnet 17 is fixed to the front, back, left and right inner surfaces of the cylindrical portion 10 b of the cover member 10. That is, the driving magnet 17 is disposed along the four side surfaces of the cylindrical portion 10b. The driving magnet 17 is magnetized so that the magnetic pole on the surface facing the driving coil 15 disposed on the upper side and the magnetic pole on the surface facing the driving coil 15 disposed on the lower side are different from each other. ing. Further, the driving magnets 17 are magnetized so that the magnetic poles on the surfaces of the four driving magnets 17 facing the driving coil 15 disposed on the upper side are the same magnetic poles.

  As shown in FIG. 4, the width in the front-rear direction of the drive magnet 17 disposed substantially parallel to the front-rear direction is longer than the width in the front-rear direction of the facing portion 15 a of the drive coil 15 substantially parallel to the front-rear direction. The width in the left-right direction of the driving magnet 17 arranged substantially parallel to the left-right direction is longer than the width in the left-right direction of the facing portion 15a substantially parallel to the left-right direction. Further, the center side portion in the front-rear direction of the driving magnet 17 disposed substantially parallel to the front-rear direction is opposed to the facing portion 15a substantially parallel to the front-rear direction. The side portion does not face the facing portion 15a. Similarly, the center side portion in the left-right direction of the drive magnet 17 arranged substantially parallel to the left-right direction is opposed to the facing portion 15a substantially parallel to the left-right direction. Both end portions are not opposed to the opposed portion 15a.

  That is, the driving magnet 17 is configured by a facing portion 17a that faces the facing portion 15a of the driving coil 15 and a non-facing portion 17b that does not face the facing portion 15a. The non-facing portion 17 b extends from the facing portion 17 a toward the four corners of the lens driving device 1. Specifically, the non-facing portion 17b is configured so that the front and rear end faces of the drive magnet 17 that are substantially parallel to the front-rear direction and the left and right end faces of the drive magnet 17 that are substantially parallel to the left-right direction are not in contact with each other. A gap S <b> 1 is formed between the end surfaces of the driving magnets 17 that extend from the facing portion 17 a toward the four corners of the lens driving device 1 and are adjacent to each other in the circumferential direction of the lens driving device 1. That is, at the four corners of the lens driving device 1, gaps S <b> 1 are formed between the end surfaces of the driving magnets 17 adjacent in the circumferential direction of the lens driving device 1. Note that the cover member 10 of this embodiment functions as a yoke for forming a magnetic circuit.

  In the lens driving device 1 configured as described above, when a current is supplied to the driving coil 15, the movable body 2 moves in the optical axis direction. Between the upper end side of the movable body 2 (specifically, the upper end side of the sleeve 8) and the upper end portion of the fixed body 3 (specifically, the bottom portion 10a of the cover member 10), A gap S <b> 2 (see FIGS. 1 and 2) is formed so that movement in the direction is possible.

(Sleeve structure)
FIG. 5 is a perspective view showing the sleeve 8 shown in FIG. 3 from the subject side. FIG. 6 is a perspective view showing the sleeve 8 shown in FIG. 3 from the non-subject side. FIG. 7 is a plan view showing a state where the cover member 10, the spacer 12, and the leaf spring 5 are removed from the lens driving device 1 shown in FIG.

  As described above, the sleeve 8 has a substantially circular inner peripheral surface when viewed from the vertical direction, and a substantially circular shape at the upper end side of the outer peripheral surface when viewed from the vertical direction. The shape on the lower end side of the outer peripheral surface when viewed from above and below is formed in a substantially cylindrical shape having a substantially square shape. On the inner peripheral surface of the sleeve 8, a female screw 8 b that is screwed into a male screw formed on the outer peripheral surface of the lens holder 7 is formed.

  On the upper end side of the sleeve 8, a plurality of convex portions 8c projecting upward are formed. In this embodiment, four convex portions 8c are formed at an equiangular pitch of approximately 90 °. Further, the four convex portions 8 c are formed at positions corresponding to the four corners of the lens driving device 1. The upper end surface of the convex portion 8c is formed so as to be substantially orthogonal to the vertical direction. The upper end surface of the convex portion 8 c is a regulating surface that abuts the lower surface of the bottom portion 10 a of the cover member 10 and regulates the amount of movement of the movable body 2 relative to the fixed body 3. A spring fixing surface 8 d to which the movable body fixing portion of the leaf spring 5 is fixed is formed on the upper end side of the sleeve 8. The spring fixing surface 8d is formed on the lower side of the convex portion 8c and on the outer peripheral side of the convex portion 8c.

  A wound portion 8 e around which the driving coil 15 is wound is formed on the outer peripheral side of the sleeve 8. The wound portion 8 e is formed so as to be recessed inward in the radial direction of the sleeve 8. Further, the two wound portions 8e are formed in a state where a predetermined interval is provided in the vertical direction. The wound portion 8e is formed so that the shape when viewed from the up and down direction is a substantially octagonal shape.

  On the upper side of the wound portion 8e disposed on the upper side, a hook-shaped expansion portion 8f is formed that extends in a direction substantially orthogonal to the vertical direction. In this embodiment, the sleeve 8 is formed with three expansion portions 8 f that expand toward three of the four corners of the lens driving device 1. Specifically, as shown in FIG. 7, the sleeve 8 is formed with three extending portions 8 f that expand toward the right front corner, the left front corner, and the right rear corner of the lens driving device 1.

  The extension portion 8 f is formed between the wound portion 8 e disposed on the upper side and the spring fixing surface 8 d in the vertical direction, and is formed on the upper portion of the sleeve 8. The extension 8f is formed in a flat plate shape substantially parallel to the XY plane formed from the left-right direction (X direction) and the front-rear direction (Y direction). Further, the extended portion 8f is formed in a flat plate shape having a substantially right-angled isosceles triangle shape when viewed from above and below, and the substantially perpendicular vertex portions are the right front corner and the left front corner of the lens driving device 1. And placed in the right rear corner. A part of the extended portion 8f overlaps a spring fixing portion 11c described later formed at the right front corner, the left front corner, and the right rear corner on the upper surface side of the base member 11 when viewed in the vertical direction. Further, the end face of the extension portion 8 f in the direction orthogonal to the up-down direction faces the driving magnet 17.

  The extended portion 8f has a notch for preventing interference between the extended portion 8f and the driving magnet 17 (specifically, the non-facing portion 17b) when the sleeve 8 rotates with the vertical direction as the axial direction. 8 g is formed. The notch portion 8g has a predetermined range in the front-rear direction including a substantially right apex of the extension portion 8f formed in a substantially right-angled isosceles triangle shape and is cut out by a certain amount toward the inner side in the left-right direction, and the extension portion 8f. A predetermined range in the left-right direction including a substantially right apex is formed by cutting out a predetermined amount toward the inside in the front-rear direction, and is formed in an approximately L shape when viewed from the up-down direction. In this embodiment, a notch 8g is formed in a range facing the non-facing portion 17b of the driving magnet 17 on the end surface in the direction orthogonal to the vertical direction of the expansion portion 8f.

  As described above, each of both ends of the conducting wire constituting the two drive coils 15 is fixed to each of the two leaf springs 6 arranged on the lower end side of the sleeve 8. Moreover, the two drive coils 15 are formed by winding a conducting wire in this order around the wound portion 8e disposed on the upper side and the wound portion 8e disposed on the lower side. The sleeve 8 has a hook portion 8h for hooking a conductive wire (that is, a part of the driving coil 15) drawn from the lower end side of the sleeve 8 to which the one end portion of the conductive wire is fixed toward the upper wound portion 8e. Is formed so as to protrude in a direction substantially orthogonal to the vertical direction (see FIG. 6).

  The hook portion 8h is formed so as to protrude toward the remaining one of the four corners of the lens driving device 1 where the extended portion 8f is not formed. That is, the hook portion 8h is formed so as to protrude toward the left rear corner of the lens driving device 1, as shown in FIG. Further, the hook portion 8 h is formed at substantially the same position as the extended portion 8 f in the vertical direction, and is formed on the upper portion of the sleeve 8. Similarly to the extension portion 8f, the hook portion 8h is formed in a flat plate shape substantially parallel to the XY plane. Further, the hook portion 8h is formed in a flat plate shape having a substantially T shape when viewed from the vertical direction. The area of the hook part 8h when viewed from the vertical direction is narrower than the area of the extended part 8f when viewed from the vertical direction. The conducting wire drawn from the lower end side of the sleeve 8 is wound around the hook portion 8h, for example, once, and then wound around the upper wound portion 8e.

  As shown in FIG. 6, it is between the upper wound part 8e and the lower wound part 8e (that is, between the two drive coils 15) and under the hook part 8h. On the side, a protrusion 8j is formed as a first protrusion that protrudes toward the left rear corner of the lens driving device 1. In addition, a protrusion as a second protrusion that protrudes toward the left rear corner of the lens driving device 1 is also below the lower winding part 8e and below the protrusion 8j. A portion 8k is formed.

  The protrusions 8j and 8k are formed in a flat plate shape substantially parallel to the XY plane. The area of the protrusions 8j and 8k when viewed from the vertical direction is larger than the area of the hook part 8h when viewed from the vertical direction. Further, the protrusions 8j and 8k slightly overlap with a spring fixing portion 11c, which will be described later, formed at the left rear corner on the upper surface side of the base member 11 when viewed in the vertical direction. Next to the hook portion 8h and the protruding portions 8j and 8k, as shown in FIG. 6, a notch portion 8m for allowing the conducting wire to pass in the vertical direction is formed. The notch 8m is recessed inward in the radial direction of the sleeve 8 to the same extent as the wound portion 8e.

(Configuration of base member)
FIG. 8 is a perspective view showing the base member 11 shown in FIG. 3 from the subject side. FIG. 9 is a perspective view showing a state in which the base member 11 shown in FIG. 3 is rotated about 180 ° around the optical axis L. As shown in FIG.

  As described above, the base member 11 is formed in a block shape having a substantially square shape when viewed from the optical axis direction, and a through hole 11a is formed at the center thereof. The through-hole 11a is formed so that the shape when viewed in the vertical direction is a substantially square shape. An IR cut filter (not shown) that constitutes a part of the camera on which the lens driving device 1 is mounted is disposed in the through hole 11a or below the through hole 11a. An imaging element (not shown) is disposed below the IR cut filter.

  At the four corners on the upper surface side of the base member 11, spring fixing portions 11 c for fixing the fixing body fixing portions of the leaf spring 6 are formed. The spring fixing portion 11c is formed so as to protrude upward from the upper surface of the base member 11, and the upper surface of the spring fixing portion 11c is a spring fixing surface to which the fixed body fixing portion of the plate spring 6 is fixed. .

  An outer peripheral wall portion 11 d is formed on the upper surface side of the base member 11 so as to follow the outer peripheral edge of the upper surface of the base member 11. The outer peripheral wall portion 11 d is formed in a substantially flat plate shape that rises upward from the outer peripheral end of the upper surface of the base member 11. A cover member fixing surface 11e that overlaps the lower end surface 10d of the cylindrical portion 10b of the cover member 10 is formed on the outer peripheral side of the outer peripheral wall portion 11d in the vertical direction. The cover member fixing surface 11e is formed over substantially the entire circumference of the base member 11.

  The cover member fixing surface 11e disposed in front of and behind the base member 11 has a substantially center position in the left-right direction, and a cover member fixing surface 11e disposed on the left and right of the base member 11 in a substantially center position in the front-rear direction. One protruding part 11f is formed. That is, a total of four convex portions 11f are formed on the cover member fixing surface 11e. The upper surface of the convex portion 11f is formed in a planar shape that is substantially orthogonal to the vertical direction, and is a contact surface 11g that contacts the lower end surface 10d of the cylindrical portion 10b. Therefore, a gap is formed between the cover member fixing surface 11e and the lower end surface 10d of the cylindrical portion 10b as shown in FIG.

  In this embodiment, the base member 11 is fixed to the lower end side of the cylindrical portion 10b by inserting the base member 11 with the adhesive applied to the outer surface of the outer peripheral wall portion 11d into the inner peripheral side of the cylindrical portion 10b. . The gap formed between the lower end surface 10d of the cylindrical portion 10b and the cover member fixing surface 11e was applied to the outer surface of the outer peripheral wall portion 11d when fixing the base member 11 to the lower end side of the cylindrical portion 10b. It is an adhesive reservoir in which a part of the adhesive accumulates.

  A wall portion 11h as a second wall portion is formed on the upper surface of the base member 11 so as to surround the through hole 11a. The wall portion 11h is formed to rise slightly from the upper surface of the base member 11 to the upper side. In this embodiment, two wall portions 11h are formed. One wall portion 11h is formed from the right front corner edge of the through hole 11a to the vicinity of the left rear corner edge via the left front corner edge. The other wall portion 11h is formed from the vicinity of the right front corner edge of the through hole 11a to the left rear corner edge via the right rear corner edge. That is, the wall portion 11h is formed so as to be substantially L-shaped when viewed from the vertical direction. In the circumferential direction of the base member 11, there is a gap between the two wall portions 11h, and the wall portion 11h is not formed over the entire circumference of the through hole 11a. In the gap between the two wall portions 11h, there is an escape portion for preventing interference with a pin (not shown) fixed to the sleeve 8 and wound around the end portion of the conducting wire of the driving coil 15. It has become.

  In addition, on the upper surface of the base member 11, three concave portions 11 j that are slightly recessed downward from the upper surface of the base member 11 are formed. The recess 11j includes two locations on the outer side in the left-right direction of the wall portion 11h disposed on the outer side in the left-right direction of the through hole 11a and one location on the rear side of the wall portion 11h disposed on the rear side of the through-hole 11a. It is formed in three places. The bottom surface of the recess 11j is the reference surface 11b described above. The wall part 11h arrange | positioned on the outer side of the left-right direction of the through-hole 11a comprises the side surface inside the left-right direction of the recessed part 11j formed in the outer side of the left-right direction. In this embodiment, the concave portion 11j formed on the outer side in the left-right direction of the wall portion 11h arranged on the outer side in the left-right direction of the through hole 11a is a reference concave portion for determining the reference position of the movable body 2 in the vertical direction. Yes.

  In the left rear corner of the upper surface of the base member 11, a wall portion 11k is formed as a first wall portion that rises upward. That is, a wall portion 11k is formed on the upper surface of the base member 11 at one location where the extended portion 8f is not formed among the four corners of the lens driving device 1. The wall portion 11k is formed on the inner peripheral side with respect to the spring fixing portion 11c formed at the left rear corner of the upper surface of the base member 11, and on the outer peripheral side with respect to the wall portion 11h. Specifically, the wall part 11k is formed so as to cover the gap between the two wall parts 11h from the outer peripheral side. The wall portion 11k includes a portion substantially parallel to the front-rear direction, a portion substantially parallel to the left-right direction, and a portion that is inclined with respect to the front-rear left-right direction and connects these two portions. The wall part 11k is higher than the wall part 11h.

  In the vicinity of the right front corner of the upper surface of the base member 11, a wall portion 11m rising upward is formed. The wall portion 11m is formed behind the spring fixing portion 11c formed at the right front corner of the upper surface of the base member 11. Moreover, the wall part 11m is formed in the outer peripheral side rather than the wall part 11h. Specifically, the wall portion 11m is formed so as to cover the gap between the two wall portions 11h from the outer peripheral side. Further, the wall portion 11m is constituted only by a portion substantially parallel to the front-rear direction. The height of the wall portion 11m is substantially equal to the height of the wall portion 11k.

(Spacer configuration)
FIG. 10 is a perspective view of the lens driving device 1 shown in FIG. 1 with the cover member 10 removed.

  As described above, the spacer 12 is formed in a substantially square flat block shape and is formed in a substantially square frame shape. At each of the four corners of the spacer 12, projections 12a projecting downward are formed. The protrusions 12 a are disposed at the four corners on the inner peripheral side of the cylindrical portion 10 b of the cover member 10. Specifically, as shown in FIG. 10, the protruding portion 12 a is disposed in an upper portion of the gap S <b> 1 formed between the end surfaces of the driving magnets 17 adjacent in the circumferential direction of the lens driving device 1. The spacer 12 of this embodiment is a spring fixing member to which a part of the leaf spring 5 is fixed.

  The lower part of the gap S1 formed on the lower side of the protrusion 12a is covered from the outer peripheral side by the four corners of the cylindrical part 10b. Part or all of the lower part of the gap S1 is filled with an adhesive not shown.

(Main effects of this form)
As described above, in the present embodiment, the sleeve 8 is formed with the three extended portions 8f that extend toward the right front corner, the left front corner, and the right rear corner of the lens driving device 1, respectively. Therefore, it is possible to reduce the gap between the sleeve 8 and the inner peripheral surface of the cylindrical portion 10b of the cover member 10 at the right front corner, the left front corner, and the right rear corner of the lens driving device 1. Therefore, as in the present embodiment, the lens driving device 1 is formed so that the shape when viewed from above and below is substantially square, so that spaces are easily formed at the four corners inside the lens driving device 1. Even if it is, the dust that has entered the inside of the lens driving device 1 from the gap S2 between the upper end side of the sleeve 8 and the bottom portion 10a of the cover member 10 passes through the inside of the cylindrical portion 10b at the four corners of the lens driving device 1. It is possible to suppress the passage and downward movement by the extension portion 8f. As a result, in this embodiment, dust that has entered the lens driving device 1 from the gap S2 adheres to the IR cut filter disposed in the through hole 11a of the base member 11 or below the through hole 11a. Can be prevented.

  In particular, in this embodiment, since the extended portion 8f is formed in the upper portion of the sleeve 8, dust that has entered the lens driving device 1 from the gap S2 passes through the inside of the cylindrical portion 10b and moves downward. This can be suppressed on the upper side of the lens driving device 1. Further, since the extension portion 8 f is formed on the upper portion of the sleeve 8, the fixing work for fixing the fixed body fixing portion of the leaf spring 6 fixed to the sleeve 8 to the spring fixing portion 11 c of the base member 11 is performed. It is hard to become an obstacle. Therefore, in this embodiment, the fixing operation of the leaf spring 6 to the spring fixing portion 11c is facilitated.

  In this embodiment, a hook portion 8 h is formed on the sleeve 8. Therefore, the conducting wire can be wound around the upper wound portion 8e in a state where the conducting wire of the driving coil 15 drawn from the lower side is hooked on the hook portion 8h. Therefore, in this embodiment, it is possible to wind one conducting wire in an orderly manner from the wound portion 8e disposed on the upper side to the wound portion 8e disposed on the lower side.

  In the present embodiment, the hook portion 8h is formed so as to protrude toward the left rear corner of the lens driving device 1, so that the left rear corner of the lens driving device 1 in which the extension portion 8f is not formed. However, the gap between the sleeve 8 and the inner peripheral surface of the cylindrical portion 10b of the cover member 10 can be reduced. Therefore, in this embodiment, it is possible to suppress the dust that has entered the lens driving device 1 from the gap S2 from moving downward even at the left rear corner of the lens driving device 1. In particular, in this embodiment, since the protruding portions 8j and 8k are formed on the lower side of the hook portion 8h, even when the area of the hook portion 8h when viewed from the vertical direction is smaller than the area of the extended portion 8f, In the left rear corner of the lens driving device 1, it is possible to effectively suppress the dust that has entered the inside of the lens driving device 1 from the gap S2 from moving downward by the protruding portions 8j and 8k.

  In this embodiment, the driving magnet 17 includes a non-facing portion 17 b extending from the facing portion 17 a toward the four corners of the lens driving device 1 in addition to the facing portion 17 a facing the facing portion 15 a of the driving coil 15. Therefore, spaces that are easily formed at the four corners inside the lens driving device 1 can be narrowed by the non-opposing portion 17b. Therefore, in this embodiment, it is possible to effectively suppress the dust that has entered the lens driving device 1 from the gap S2 from moving downward.

  In this embodiment, the protrusions 12 a formed at the four corners of the spacer 12 are arranged in the upper part of the gap S <b> 1 formed between the end surfaces of the driving magnets 17 adjacent in the circumferential direction of the lens driving device 1. Therefore, the upper part of the gap S1 can be filled with the protrusion 12a. Therefore, in this embodiment, it is possible to effectively suppress the dust that has entered the lens driving device 1 from the gap S2 from moving downward. In particular, in this embodiment, part or all of the lower part of the gap S1 is filled with the adhesive, so that the dust that has entered the lens driving device 1 from the gap S2 can be effectively prevented from moving downward. It becomes possible to suppress. Further, in this embodiment, since a part or all of the lower part of the gap S1 is filled with the adhesive, the fixing strength of the driving magnet 17 with respect to the fixed body 3 can be increased. Therefore, in this embodiment, the impact resistance of the lens driving device 1 can be improved.

  In this embodiment, a wall portion 11k that rises upward is formed in the left rear corner of the upper surface of the base member 11. Therefore, even if the dust that has entered the inside of the lens driving device 1 from the gap S <b> 2 moves to the base member 11 at the left rear corner of the lens driving device 1 where the hook portion 8 h is formed, the dust is transferred to the base member 11. It is possible to prevent the wall 11k from adhering to the IR cut filter disposed in the through hole 11a or below the through hole 11a.

  Further, in this embodiment, since the wall 11h is formed in the base member 11 so as to surround the through hole 11a, the dust that has entered the inside of the lens driving device 1 from the gap S2 is assumed at the four corners of the lens driving device 1. Even if it moves to the base member 11, the wall 11h prevents this dust from adhering to the IR cut filter disposed in the through hole 11a of the base member 11 or below the through hole 11a. Is possible. In the present embodiment, since the wall portion 11k is higher than the wall portion 11h, it is effective that dust adheres to the IR cut filter at the left rear corner of the lens driving device 1 where the hook portion 8h is formed. Can be prevented.

  In this embodiment, the extended portion 8f is formed in a flat plate shape. Therefore, as compared with the case where the extension portion 8f is formed in a block shape, the extension portion 8f is less likely to get in the way when the drive coil 15 is wound. Therefore, in this embodiment, the winding work of the driving coil 15 is facilitated.

  In this embodiment, a notch 8g is formed in the extended portion 8f. Therefore, in this embodiment, even if the expansion portion 8 f is formed on the sleeve 8 and the non-opposing portion 17 b is formed on the driving magnet 17, it is possible to prevent interference between the sleeve 8 and the driving magnet 17. become. If the movable body 2 rotates excessively about the optical axis L, the extension portion 8f and the driving magnet 17 come into contact with each other, and plastic deformation of the leaf springs 5 and 6 can be prevented. is there.

  In this embodiment, a convex portion 11f is formed on the cover member fixing surface 11e of the base member 11 that overlaps the lower end surface 10d of the cylindrical portion 10b of the cover member 10, and the upper surface of the convex portion 11f is the lower end surface 10d of the cylindrical portion 10b. It is the contact surface 11g which contacts. Therefore, it is easier to ensure the flatness and dimensional accuracy of the contact surface 11g than when the entire cover member fixing surface 11e is in contact with the lower end surface 10d of the cylindrical portion 10b. Therefore, in this embodiment, the inclination of the cover member 10 with respect to the base member 11 can be suppressed. Moreover, it becomes easy to ensure the vertical dimensional accuracy of the lens driving device 1 in a state where the base member 11 and the cover member 10 are fixed.

  Since the inclination of the cover member 10 with respect to the base member 11 can be suppressed, variation in the circumferential direction of the lens driving device 1 in the gap S2 between the upper end side of the sleeve 8 and the bottom portion 10a of the cover member 10 is suppressed. In addition, since it becomes easy to ensure the dimensional accuracy in the vertical direction of the lens driving device 1 in a state where the base member 11 and the cover member 10 are fixed, the variation in the vertical circumferential direction of the gap S2 is suppressed. It becomes possible to do. As a result, in the present embodiment, it is possible to prevent large dust corresponding to the gap S2 when the variation is large from entering the lens driving device 1 from the gap S2, and the movable body 2 can be moved. It becomes possible to secure the range appropriately. Further, it is possible to suppress variation in the amount of deflection of the leaf spring 5 when the contact surface 8a of the sleeve 8 and the reference surface 11b of the base member 11 are in contact with each other and the movable body 2 is disposed at a predetermined reference position. It becomes possible. Therefore, it is possible to suppress variations in the current (starting current) supplied to the driving coil 15 when the movable body 2 starts to move.

  Further, in this embodiment, a gap formed between the cover member fixing surface 11e and the lower end surface 10d of the cylindrical portion 10b is used to fix the base member 11 to the lower end side of the cylindrical portion 10b. Since a part of the adhesive applied to the outer side surface is an adhesive reservoir, it is possible to prevent the adhesive from protruding from the joint portion between the cover member 10 and the base member 11.

(Other embodiments)
The above-described embodiment is an example of a preferred embodiment of the present invention, but is not limited to this, and various modifications can be made without departing from the scope of the present invention.

  In the above-described embodiment, the sleeve 8 is formed with the three extended portions 8 f that expand toward the three of the four corners of the lens driving device 1. In addition, for example, the sleeve 8 may be formed with two expansion portions 8f that extend toward two of the four corners of the lens driving device 1, or among the four corners of the lens driving device 1. One extended portion 8f extending toward one place may be formed. Further, if the hook portion 8h is not formed, the sleeve 8 may be formed with four extended portions 8f extending toward the four corners of the lens driving device 1.

  In the embodiment described above, the extension portion 8f is formed on the upper side of the wound portion 8e disposed on the upper side. In addition to this, for example, the extended portion 8f may be formed between the wound portion 8e disposed on the upper side and the wound portion 8e disposed on the lower side, or disposed on the lower side. You may form below the to-be-wrapped part 8e. Further, the upper portion of the wound portion 8e disposed on the upper side, the portion between the wound portion 8e disposed on the upper side and the wound portion 8e disposed on the lower side, and the portion disposed on the lower side. The extended portions 8f may be formed at three locations below the winding portion 8e, or at two of these three locations. In the embodiment described above, the protrusions 8j and 8k are formed on the lower side of the hook part 8h. However, the protrusion 8j and / or the protrusion 8k is not formed on the lower side of the hook part 8h. Also good.

  In the embodiment described above, the driving magnet 17 is configured by the facing portion 17a that faces the facing portion 15a of the driving coil 15 and the non-facing portion 17b that does not face the facing portion 15a. In addition to this, for example, the driving magnet 17 may be configured only by the facing portion 17a facing the facing portion 15a. In this case, members (for example, substantially L-shaped members along the four corners of the cover member 10) for filling spaces that are easily formed at the four corners inside the lens driving device 1 may be separately provided.

  In the embodiment described above, one wall portion 11k is formed at the left rear corner of the upper surface of the base member 11. In addition to this, for example, a plurality of wall portions that are double or triple overlapped in the radial direction of the lens driving device 1 may be formed in the left rear corner of the upper surface of the base member 11. In the embodiment described above, the wall portion 11k is formed in the left rear corner of the upper surface of the base member 11, and the wall portion 11m is formed in the vicinity of the right front corner of the upper surface of the base member 11, but the wall portion 11k is formed. , 11m, or in place of the wall portions 11k, 11m, the front left corner of the upper surface of the base member 11 and / or the right rear corner of the upper surface of the base member 11 corresponds to the wall portions 11k, 11m. A wall portion may be formed. Further, the wall portions 11 k and 11 m may not be formed on the upper surface of the base member 11.

  In the form mentioned above, the two wall parts 11h whose shape when it sees from an up-down direction becomes a substantially L shape are formed so that the through-hole 11a may be enclosed. In addition to this, for example, instead of the two wall portions 11h, a single wall portion having a substantially rectangular frame shape when viewed from above and below may be formed so as to surround the through hole 11a. Alternatively, four wall portions having a substantially straight shape when viewed from above and below may be formed so as to surround the through hole 11a. In addition, a plurality of wall portions may be formed so as to surround the through hole 11a, and some of them may overlap in the radial direction of the lens driving device 1.

  In the embodiment described above, a total of four convex portions 11 f are formed on the cover member fixing surface 11 e of the base member 11. In addition to this, for example, a total of three convex portions 11f may be formed on the cover member fixing surface 11e, or a total of five or more convex portions 11f may be formed. Moreover, the convex part 11f does not need to be formed in the cover member fixing surface 11e. Moreover, in the form mentioned above, although the lens drive device 1 is formed so that the shape when seen from the optical axis direction is a substantially square shape, the lens drive device 1 is when seen from the optical axis direction. You may form so that a shape may become a substantially rectangular shape.

  In the embodiment described above, the extension 8f is formed in a flat plate shape substantially parallel to the XY plane. In addition to this, for example, the extended portion 8f may be formed in a flat plate shape that is inclined upward or downward as it goes outward in the radial direction of the sleeve 8. Further, a recess for holding dust may be formed in the extended portion 8f so as to be recessed downward.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 4 Drive mechanism 5 Leaf spring 8f Expansion part 8g Notch part 8h Hook part 8j Protrusion part (1st protrusion part)
8k protrusion (second protrusion)
10 Cover member 10d Lower end surface of the cylindrical portion (end surface on the side opposite to the subject of the cover member)
11 base member 11a through hole 11b reference surface 11e cover member fixing surface 11f convex portion 11g abutting surface 11h wall portion (second wall portion)
11j recess (reference recess)
11k wall (first wall)
12 Spacer (spring fixing member)
12a Protruding portion 15 Driving coil 17 Driving magnet 17a Opposing portion 17b Non-opposing portion L Optical axis S1 Gap Z Optical axis direction Z1 Subject side Z2 Anti-subject side

Claims (11)

A lens driving device having a substantially square shape when viewed from the optical axis direction of the lens,
A movable body that holds the lens and is movable in the optical axis direction; a fixed body that holds the movable body so as to be movable in the optical axis direction; and a drive mechanism that drives the movable body in the optical axis direction. Prepared,
The drive mechanism includes a drive coil wound around the outer peripheral surface of the movable body,
The fixed body includes a cover member that covers an outer peripheral side of the movable body and the drive mechanism, and a base member that constitutes an end surface on the side opposite to the subject of the lens driving device ,
The movable body includes three expansion portions that extend in a direction substantially perpendicular to the optical axis direction and toward each of three of the four corners of the lens driving device, and is routed from the non-subject side. A hook portion for hooking a part of the driving coil is provided on the subject side of the movable body,
The hook portion protrudes in a direction substantially orthogonal to the optical axis direction and toward the remaining one of the four corners of the lens driving device in which the extension portion is not formed,
A through-hole penetrating in the optical axis direction is formed at a substantially center of the base member,
A first wall portion that rises toward the subject side is formed on the subject side surface of the base member at the remaining one of the four corners of the lens driving device in which the extension portion is not formed. A second wall portion is formed on the surface of the base member on the subject side so as to surround the through hole and rise toward the subject side;
The lens driving device according to claim 1, wherein the first wall portion is higher than the second wall portion .   The lens driving device according to claim 1, wherein the extension portion is formed on a subject side of the movable body. The lens driving device according to claim 1, wherein the extension portion is formed in a flat plate shape. The drive mechanism includes a plate-shaped actuating magnets are arranged along the four sides of the cover member which is formed into a substantially square tube shape,
The driving magnet includes a facing portion that faces the driving coil and a non-facing portion that extends from the facing portion toward two adjacent corners of the lens driving device. Item 4. The lens driving device according to any one of Items 1 to 3.   The extension portion is formed with a notch for preventing interference between the extension portion and the driving magnet when the movable body rotates with the optical axis direction as the axial direction. The lens driving device according to claim 4. A leaf spring connecting the movable body and the fixed body on the subject side of the movable body;
The fixed body includes a substantially rectangular frame-shaped spring fixing member to which a part of the leaf spring is fixed,
The spring fixing member includes protrusions that are arranged at the four corners of the lens driving device and extend toward the opposite subject side,
The lens driving device according to claim 4, wherein the protrusion is disposed in a gap formed between end surfaces of the driving magnets adjacent in the circumferential direction of the lens driving device.   7. The adhesive according to claim 4, wherein at least a part of a gap formed between end faces of the driving magnets adjacent in the circumferential direction of the lens driving device is filled with an adhesive. The lens drive device described in 1. The driving mechanism includes two driving coils wound around the movable body with a predetermined interval in the optical axis direction,
Between the two driving coils of the movable body, the remaining one of the four corners of the lens driving device in a direction substantially perpendicular to the optical axis direction and where the extension portion is not formed. The lens driving device according to any one of claims 1 to 7, wherein a first projecting portion projecting toward the portion is formed. On the non-subject side of the movable body is a first projection protruding in a direction substantially perpendicular to the optical axis direction and toward the remaining one of the four corners of the lens driving device where the extension portion is not formed. the lens driving device according to any one of claims 1 to 8, characterized in that the second projecting portion is formed. A reference recess for determining a reference position of the movable body in the optical axis direction is formed on the object side surface of the base member so as to be recessed toward the opposite object side,
The bottom surface of the reference recess is a reference surface that determines the reference position of the movable body in the optical axis direction by contacting the movable body,
It said second wall portion, the lens driving device according to any one of claims 1 to 9, characterized in that constitutes a side surface of the reference recess. The base member is formed with a cover member fixing surface that overlaps an end surface on the side opposite to the subject of the cover member formed in a substantially rectangular tube shape in the optical axis direction,
The said cover member fixing surface, of claims 1 to 10, characterized in that protrusions having a contact surface abutting against the end face of the counter-object side of the cover member is formed so as to protrude toward the subject The lens driving device according to any one of the above.

Images