JP5341617B2 - Lens drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens drive device that appropriately operates a movable body by suppressing variation in biasing force applied to the movable body by a spring plate. <P>SOLUTION: The lens driving device includes: the movable body 2 holding a lens and movable in the direction of the optical axis of the lens; an immovable body 3 holding the movable body 2 in the direction of the optical axis; and the plate spring 6 having a movable-body-fixed portion 6a, which is fixed to the movable body 2, an immovable-body-fixed portion 6b, which is fixed to the immovable body 3, and an arm connecting the movable-body-fixed portion 6a and immovable-body-fixed portion6b. The movable body 2 includes a movable surface 10c on the movable body side, for fixing the movable-body-fixed portion 6a. The immovable body 3 includes a fixing surface 12c on the immovable body side, for fixing the immovable-body-fixed portion 6b. The plate spring 6 is fixed to the movable body 2 and immovable body 3 so that the movable-body-fixed portion 6a and the fixing surface 10c on the movable side may abut on each other and that a gap may be left between the immovable-body-fixed portion 6b and the fixing surface 12c on the immovable body side in the direction of the optical axis. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

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

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a moving lens body that holds the lens and moves in the optical axis direction, and a moving lens body through two leaf springs. There is known a lens driving device including a fixed body that is movably held (see, for example, Patent Document 1). In the lens driving device described in Patent Document 1, a driving coil is wound around the outer periphery of a cylindrical sleeve constituting a moving lens body, and a magnet is disposed so as to face the end surface of the driving coil in the optical axis direction. Has been placed.

  In this lens driving device, the leaf spring connects the portion fixed to the fixed body, the portion fixed to the moving lens body, the portion fixed to the fixed body, and the portion fixed to the moving lens body. It consists of three arms. Further, in this lens driving device, a portion fixed to the fixed body of the plate spring is in contact with a fixed surface formed on the fixed body, and a portion fixed to the moving lens body of the plate spring is formed on the moving lens body. The leaf spring is fixed to the movable lens body and the fixed body in a state where it abuts on the fixed surface.

JP 2007-148354 A

  In the lens driving device described in Patent Document 1, as described above, the portion fixed to the fixed body of the leaf spring comes into contact with the fixed surface formed on the fixed body and is fixed to the moving lens body of the leaf spring. The leaf spring is fixed to the moving lens body and the fixed body in a state in which is in contact with the fixed surface formed on the moving lens body. For this reason, the moving lens in a state in which the bending of the leaf spring when the moving lens body is at a predetermined reference position is different from the design target due to variations in the dimensions of the moving lens body, the fixed body, and the like. The leaf spring may be fixed to the body and the fixed body.

  In this case, the urging force of the moving lens body due to the leaf spring may vary, making it difficult to appropriately operate the moving lens body. For example, the phenomenon that the moving lens body does not operate despite supplying a current of a predetermined value to the driving coil, and the biasing force of the moving lens body by the leaf spring varies in the circumferential direction of the sleeve. There is a risk that the optical axis of the lens may be tilted when the moving lens body is driven.

  Accordingly, an object of the present invention is to provide a lens driving device capable of appropriately operating the movable body while suppressing variations in the urging force of the movable body due to the leaf spring.

In order to solve the above problems, a lens driving device of the present invention includes a movable body that holds a lens and is movable in the optical axis direction of the lens, a fixed body that holds the movable body so as to be movable in the optical axis direction, and a movable body. A driving mechanism for driving the body in the optical axis direction, a movable body fixing portion fixed to the movable body, a fixed body fixing portion fixed to the fixed body, a movable body fixing portion, and a fixed body fixing portion The fixed body has a fixed body side fixed surface for fixing the fixed body fixed portion and a reference surface for determining the reference position of the movable body in the optical axis direction. The movable body is formed with a movable body side fixed surface for fixing the movable body fixing portion and an abutting surface that contacts the reference surface, and the leaf spring includes the movable body fixing portion and the movable body side fixed surface. with but contacts, the fixed body fixing portion in the optical axis direction and the fixed body side fixing surface In so that a gap is formed, and so that no bent leaf spring when the reference surface by utilizing the gap between the fixed body fixing portion and the fixed body side fixing surface and abutment surface is in contact with In addition , the fixed body fixing portion and the fixed body side fixed surface are in contact with each other , and there is a gap between the movable body fixed portion and the movable body side fixed surface in the optical axis direction. Movable so that the leaf spring is not bent when the reference surface and the contact surface are in contact with each other by using the gap between the movable body fixing portion and the movable body-side fixed surface. It is fixed to the body and the fixed body.

In the lens driving device of the present invention, the leaf spring is formed on the movable body and the stationary body so that a gap is formed between the stationary body fixing portion of the leaf spring and the stationary body side fixing surface of the stationary body in the optical axis direction. It is fixed. Alternatively, in the present invention, the leaf spring is fixed to the movable body and the fixed body so that a gap is formed between the movable body fixing portion of the leaf spring and the movable body side fixed surface of the movable body in the optical axis direction. ing. Further, in the present invention , the reference surface and the abutting surface are formed using a gap between the fixed body fixing portion and the fixed body side fixing surface or a gap between the movable body fixing portion and the movable body side fixing surface. The plate spring is fixed to the movable body and the fixed body so that the plate spring does not bend when abutting . Therefore, in the present invention, it is possible to suppress variation in the urging force of the movable body due to the leaf spring, and as a result, it is possible to appropriately operate the movable body.

In the present invention, example, the interval between the movable body side fixing face of the fixed body side fixing surface in the optical axis direction when the the base reference plane and the abutment surface is in contact is larger than the thickness of the leaf spring .

  In the present invention, for example, the drive mechanism includes a drive coil attached to the movable body, the end of the drive coil is connected to a leaf spring, and the leaf spring includes a movable body fixing portion and a movable body side fixed surface. The movable body and the fixed body are fixed so that a gap is formed between the fixed body fixing portion and the fixed body-side fixing surface in the optical axis direction. In this case, first, the movable body fixing portion and the movable body side fixing surface are fixed, and then the fixed body fixing portion and the fixed body side fixing surface are fixed. Therefore, the fixed body fixing portion and the fixed body side fixing surface are fixed first, and then the end of the driving coil attached to the movable body is compared with the case where the movable body fixing portion and the movable body side fixing surface are fixed. The process of connecting the portion to the leaf spring is facilitated.

In the present invention, example, biasing means for abutting a proximal reference plane and the abutment surface is arranged on one side of the movable body in the optical axis direction, the plate spring on the other side of the movable body in the optical axis direction Is arranged. In the present invention, the leaf spring is fixed to the movable body and the fixed body so that the leaf spring does not bend when the reference surface and the contact surface are in contact. When the contact surface is in contact with the contact surface, no urging force is generated by the leaf spring . Therefore, the influence of the biasing force of the leaf spring when the reference surface and the contact surface are in contact can be eliminated, and the reference surface and the contact surface can be reliably contacted by the biasing means. Become.

  In the present invention, for example, leaf springs are arranged on both sides of the movable body in the optical axis direction. Moreover, in this invention, the adhesive agent hardening part which the adhesive agent hardened | cured is formed in the clearance gap.

  In the present invention, it is preferable that a through hole penetrating in the optical axis direction is formed in the fixing body fixing portion, and an adhesive curing portion in which the adhesive is cured is formed on the inner peripheral side of the through hole. If comprised in this way, it will become possible to raise the adhesive strength of a fixed body fixing | fixed part and a fixed body using a through-hole.

  As described above, in the lens driving device of the present invention, it is possible to appropriately operate the movable body while suppressing variations in the urging force of the movable body due to the leaf spring.

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. FIG. 4 is an exploded perspective view showing a sleeve, a base member, and a leaf spring shown in FIG. 3. FIG. 4 is an exploded perspective view showing the sleeve and the leaf spring shown in FIG. 3 from the side opposite to the subject. FIG. 4 is a bottom view showing a sleeve, a drive magnet, and a leaf spring shown in FIG. 3 from the opposite object side. It is an enlarged view of the F section of FIG. It is an enlarged view which shows the arrangement | positioning relationship between the sleeve concerning other embodiment of this invention, a base member, and a leaf | plate spring.

  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.

  The lens driving device 1 of this embodiment is mounted on a relatively small camera used in a mobile phone or the like, and is formed in a substantially quadrangular prism shape as a whole as shown in FIG. 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 the camera in which the lens driving device 1 of this embodiment is mounted, an image sensor (not shown) is arranged on the lower side (that is, the Z2 direction side) of FIG. 2, and the upper side (that is, the Z1 direction side) of FIG. The subject placed in is photographed. Therefore, in the following description, the Z1 direction side is the subject side (object side), and the Z2 direction side is the anti-subject side (imaging element side).

  As shown in FIGS. 1 to 3, 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. The movable body 2 is movably held by the fixed body 3 via two types of plate springs 5 and 6. In this embodiment, one leaf spring 5 is disposed on the subject side of the movable body 2, and four leaf springs 6 are disposed on the opposite subject side of the movable body 2.

  The movable body 2 includes a sleeve 10 that holds a lens holder 9 to which a plurality of lenses are fixed. The fixed body 3 includes a case body 11 constituting a side surface of the lens driving device 1, a base member 12 constituting an end surface of the lens driving device 1 on the side opposite to the subject, and a spacer 13 to which a part of the leaf spring 5 is fixed. It has. In FIG. 3, the lens holder 9 is not shown.

  The lens holder 9 is formed in a substantially cylindrical shape, and a plurality of lenses are fixed on the inner peripheral side thereof. The sleeve 10 is formed of, for example, a resin material and is formed in a substantially cylindrical shape, and holds the lens holder 9 on the inner peripheral side thereof. That is, the outer peripheral surface of the lens holder 9 is fixed to the inner peripheral surface of the sleeve 10. A more specific configuration of the sleeve 10 will be described later.

  The case body 11 is formed of a magnetic material, and is formed in a substantially square cylindrical shape with a bottom having a bottom portion 11a and a cylindrical portion 11b. A circular through hole 11c is formed at the center of the bottom 11a disposed on the subject side. The case body 11 is disposed so as to surround the outer peripheral side of the movable body 2 and the drive mechanism 4.

  For example, the base member 12 is formed of a resin material and is formed in a substantially square shape. A circular through hole 12 a is formed at the center of the base member 12. The base member 12 is attached to the opposite side of the case body 11. A more specific configuration of the base member 12 will be described later.

  The spacer 13 is formed of, for example, a resin material and is formed in a substantially square shape. The spacer 13 is fixed to the surface on the side opposite to the subject of the bottom 11 a of the case body 11. At the four corners of the spacer 13, spring fixing portions 13a for fixing a part of the leaf spring 5 are formed so as to protrude toward the opposite object side.

  The leaf spring 5 includes an annular movable body fixing portion 5a fixed to the subject side of the sleeve 10, four fixed body fixing portions 5b fixed to the spring fixing portion 13a of the spacer 13, and the movable body fixing portion 5a. And four arm portions 5c that connect the fixed body fixing portion 5b (see FIG. 3). The movable body fixing portion 5a is fixed to the sleeve 10 in contact with a fixed surface formed on the subject side of the sleeve 10. The fixed body fixing portion 5b is fixed to the spacer 13 in a state of being in contact with a fixing surface formed on the side opposite to the subject of the spring fixing portion 13a. The arm portion 5c is formed in a predetermined curved shape in order to avoid interference with other components and to obtain a predetermined spring constant.

  The leaf spring 6 includes a movable body fixing portion 6a that is fixed to the sleeve 10, a fixed body fixing portion 6b that is fixed to the base member 12, and an arm portion 6c that connects the movable body fixing portion 6a and the fixed body fixing portion 6b. (Refer to FIG. 3). A more specific configuration of the leaf spring 6 will be described later.

  The driving mechanism 4 includes four driving magnets 15 disposed at the four corners of the lens driving device 1 and two driving coils 16 wound around the outer peripheral side of the sleeve 10. The two driving coils 16 are wound around the outer peripheral side of the sleeve 10 with a predetermined interval in the optical axis direction. The four driving magnets 15 are arranged at the four corners on the inner peripheral side of the case body 11 so as to face the outer peripheral surface of the driving coil 16. In this embodiment, the drive magnet 15 is fixed in contact with the inner peripheral surface of the case body 11, and the case body 11 functions as a yoke for forming a magnetic circuit.

(Configuration of sleeve, base member and leaf spring)
4 is an exploded perspective view showing the sleeve 10, the base member 12, and the leaf spring 6 shown in FIG. FIG. 5 is an exploded perspective view showing the sleeve 10 and the leaf spring 6 shown in FIG. 3 from the opposite object side. FIG. 6 is a bottom view showing the sleeve 10, the driving magnet 15 and the leaf spring 6 shown in FIG. FIG. 7 is an enlarged view of a portion F in FIG.

  On the subject side of the base member 12, a reference surface 12b for determining a reference position of the movable body 2 in the optical axis direction is formed as shown in FIG. Specifically, four reference surfaces 12b are formed at a substantially 90 ° pitch on the edge of the through hole 12a. The reference surface 12b is formed in a planar shape orthogonal to the optical axis direction.

  Further, as shown in FIG. 4, fixed body side fixing surfaces 12 c for fixing the fixed body fixing portions 6 b of the leaf spring 6 are formed at the four corners of the base member 12. The fixed body side fixing surface 12c is formed in a planar shape orthogonal to the optical axis direction. In addition, a positioning protrusion 12d for positioning the fixing body fixing portion 6b of the leaf spring 6 is formed on the fixing body side fixing surface 12c in a direction orthogonal to the optical axis direction. The positioning protrusion 12d is formed so as to protrude toward the subject side.

  As shown in FIG. 5, a contact surface 10 a that contacts the reference surface 12 b of the base member 12 is formed on the end surface of the sleeve 10 on the side opposite to the subject. Specifically, four contact surfaces 10a are formed at a substantially 90 ° pitch so as to correspond to the reference surface 12b. The contact surface 10a is formed in a planar shape orthogonal to the optical axis direction.

  Further, as shown in FIG. 5, a movable body side fixed surface 10 c for fixing the movable body fixing portion 6 a of the leaf spring 6 is formed on the side opposite to the subject of the sleeve 10. The movable body side fixed surface 10c is formed in a planar shape orthogonal to the optical axis direction. In addition, the movable body side fixed surface 10c is formed so as to be adjacent to the contact surface 10a and is formed closer to the subject than the contact surface 10a. A positioning protrusion 10d for positioning the movable body fixing portion 6a of the leaf spring 6 is formed on the movable body side fixed surface 10c in a direction orthogonal to the optical axis direction. The positioning protrusion 10d is formed so as to protrude toward the non-subject side.

  A magnetic member 18 is fixed to the subject side of the sleeve 10 as shown in FIGS. The magnetic member 18 is formed in an annular shape, and is fixed to the sleeve 10 so as to be disposed closer to the subject side than the end surface on the subject side of the driving magnet 15.

  As described above, the leaf spring 6 includes the movable body fixing portion 6a, the fixed body fixing portion 6b, and the arm portion 6c, and is formed with a substantially constant thickness. A through hole 6d through which the positioning protrusion 10d is inserted is formed in the movable body fixing portion 6a so as to penetrate in the optical axis direction. A through hole 6e through which the positioning protrusion 12d is inserted is formed in the fixed body fixing portion 6b so as to penetrate in the optical axis direction. The arm portion 6c is formed in a predetermined curved shape in order to avoid interference with other components and to obtain a predetermined spring constant.

  Note that the end of the drive coil 16 is fixed to the leaf spring 6 by soldering or the like, and the drive coil 16 and the leaf spring 6 are electrically connected. The fixed body fixing portion 6b is formed with a soldering portion to which a lead wire or the like for electrically connecting the terminal 19 fixed to the base member 12 and the leaf spring 6 is soldered.

  In this embodiment, when no current is supplied to the drive coil 16, the reference surface 12b of the base member 12 and the contact surface 10a of the sleeve 10 come into contact with each other, and the movable body 2 is arranged at a predetermined reference position. Thus, the leaf spring 5 is fixed to the sleeve 10 and the spacer 13 in a bent state. That is, the leaf spring 5 is in a bent state so that the urging force that abuts the reference surface 12b and the abutment surface 10a is generated when no current is supplied to the drive coil 16. It is fixed to the spacer 13.

  Further, in this embodiment, the magnetic member 18 is fixed to the sleeve 10 so as to be disposed on the subject side with respect to the end surface on the subject side of the driving magnet 15, and between the magnetic member 18 and the driving magnet 15. The biasing force in the direction in which the reference surface 12b and the contact surface 10a are brought into contact with each other is acting. As described above, in this embodiment, the driving magnet 15 and the magnetic member 18 and the leaf spring 5 constitute an urging means for bringing the reference surface 12b and the contact surface 10a into contact with each other.

  On the other hand, the leaf spring 6 is fixed to the sleeve 10 and the base member 12 so that an urging force is not generated by the leaf spring 6 when the reference surface 12b and the contact surface 10a are in contact. Specifically, first, as shown in FIG. 7, the gap G between the movable body side fixed surface 10c and the fixed body side fixed surface 12c in the optical axis direction when the reference surface 12b and the contact surface 10a are in contact with each other is The thickness of the leaf spring 6 is greater than t. In this embodiment, the minimum value in the design variation range of the gap G between the movable body side fixed surface 10c and the fixed body side fixed surface 12c is the maximum value in the design variation range of the thickness t of the leaf spring 6. Is bigger than.

  The leaf spring 6 is first fixed to the sleeve 10. Specifically, the movable body fixing portion 6a is fixed to the movable body side by bonding or welding in a state where the positioning protrusion 10d is inserted into the through hole 6d and the movable body fixing portion 6a and the movable body side fixing surface 10c are in contact with each other. It is fixed to the surface 10c. In addition, after the leaf spring 6 is fixed to the sleeve 10, the end of the driving coil 16 is fixed to the leaf spring 6 by soldering or the like. That is, after the leaf spring 6 is fixed to the sleeve 10, the end portion of the driving coil 16 is processed.

  Thereafter, the leaf spring 6 is fixed to the base member 12. Specifically, the fixed body fixing portion 6b is fixed to the fixed body-side fixing surface 12c by bonding in a state where the reference surface 12b and the contact surface 10a are brought into contact with each other and the positioning protrusion 12d is inserted through the through hole 6e. The At this time, the fixed body fixing portion 6b is fixed to the fixed body side fixing surface 12c so that the leaf spring 6 does not bend. For example, while the reference surface 12b is brought into contact with the contact surface 10a, the fixed body fixing portion 6b is fixed to the fixed body side fixing surface 12c in a state where the fixed body fixing portion 6b is not supported by a jig or the like (free state). Fixed to. In this embodiment, when the fixed body fixing portion 6b is fixed to the fixed body side fixing surface 12c, a gap is formed between the fixed body fixing portion 6b and the fixed body side fixing surface 12c.

  Thus, in this embodiment, as shown in FIG. 7, the movable body fixing portion 6a and the movable body side fixing surface 10c abut, and in the optical axis direction, the fixed body fixing portion 6b and the fixed body side fixing surface 12c The leaf spring 6 is fixed to the sleeve 10 and the base member 12 so that a gap is formed between them.

  When the fixing body fixing portion 6b is bonded to the fixing body-side fixing surface 12c, the fixing body excluding the soldering portion to which the lead wire for electrically connecting the terminal 19 and the leaf spring 6 is soldered. An adhesive is applied to the entire surface of the fixing portion 6b, and an adhesive curing portion (not shown) in which the adhesive is cured is formed in a gap formed between the fixing body fixing portion 6b and the fixing body-side fixing surface 12c. It is formed. Further, an adhesive curing portion (not shown) in which the adhesive is cured is also formed on the inner peripheral side of the through hole 6e. The adhesive for fixing the leaf spring 6 is, for example, an ultraviolet curable adhesive.

(Main effects of this form)
As described above, in the present embodiment, the movable body side fixed surface 10c and the fixed body side fixed surface 12c in the optical axis direction when the reference surface 12b of the base member 12 and the contact surface 10a of the sleeve 10 are in contact with each other. The interval G is larger than the thickness t of the leaf spring 6, and the movable body fixing portion 6a and the movable body side fixing surface 10c come into contact with each other, but in the optical axis direction, the fixed body fixing portion 6b and the fixed body side fixing surface. The leaf spring 6 is fixed to the sleeve 10 and the base member 12 so that a gap is formed between the sleeve 12 and the base member 12.

  Therefore, using the gap between the fixed body fixing portion 6b and the fixed body side fixed surface 12c, as described above, the biasing force by the leaf spring 6 when the reference surface 12b and the contact surface 10a are in contact with each other. The leaf spring 6 can be fixed to the sleeve 10 and the base member 12 so as not to occur. Therefore, in this embodiment, it is possible to suppress variation in the urging force of the movable body 2 due to the leaf spring 6, and as a result, it is possible to operate the movable body 2 appropriately. For example, it is possible to suppress variations in biasing force due to the four leaf springs 6 and to prevent a problem that the optical axis L of the lens is inclined when the movable body 2 is driven.

  In this embodiment, the leaf spring 6 can be fixed to the sleeve 10 and the base member 12 so that the urging force by the leaf spring 6 does not occur when the reference surface 12b and the contact surface 10a are in contact. Therefore, it is possible to eliminate the influence of the urging force of the leaf spring 6 when the reference surface 12b and the contact surface 10a are in contact. Therefore, when the current is not supplied to the driving coil 16 by the biasing force generated by the driving magnet 15 and the magnetic member 18 and the leaf spring 5, the reference surface 12b and the contact surface 10a are reliably contacted. Can be made.

  In this embodiment, the movable body fixing portion 6a and the movable body side fixing surface 10c are fixed, and then the fixed body fixing portion 6b and the fixed body side fixing surface 12c are fixed. Therefore, first, the fixed body fixing portion 6b and the fixed body side fixing surface 12c are fixed, and then wound around the sleeve 10 as compared with the case where the movable body fixing portion 6a and the movable body side fixing surface 10c are fixed. The process of connecting the end of the driving coil 16 to the leaf spring 6 is facilitated.

  In this embodiment, an adhesive curing portion in which the adhesive is cured is formed on the inner peripheral side of the through hole 6e formed in the fixed body fixing portion 6b. Therefore, the adhesive strength between the fixed body fixing portion 6b and the base member 12 can be increased using the through hole 6e. In addition, it is possible to increase the adhesive strength between the fixed body fixing portion 6b and the base member 12 by applying an adhesive to the outer peripheral side of the fixed body fixing portion 6b without using the through hole 6e. In this case, since the bonding area has to be increased, the fixed body fixing portion 6b and the fixed body side fixing surface 12c may be increased in size. In this case, an adhesive may be attached to the arm portion 6c to change the spring constant of the leaf spring 6.

(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 embodiment described above, as shown in FIG. 7, the movable body fixing portion 6 a and the movable body side fixing surface 10 c abut, and in the optical axis direction, between the fixed body fixing portion 6 b and the fixed body side fixing surface 12 c. The leaf spring 6 is fixed to the sleeve 10 and the base member 12 so that a gap is formed. In addition to this, as shown in FIG. 8, for example, the fixed body fixing portion 6b and the fixed body side fixing surface 12c are in contact with each other, and in the optical axis direction, between the movable body fixing portion 6a and the movable body side fixing surface 10c. The leaf spring 6 may be fixed to the sleeve 10 and the base member 12 so that a gap is formed in the sleeve 10.

  Even in this case, the biasing force of the leaf spring 6 is used when the reference surface 12b and the contact surface 10a are in contact with each other by utilizing the gap between the movable body fixing portion 6a and the movable body-side fixed surface 10c. The leaf spring 6 can be fixed to the sleeve 10 and the base member 12 so as not to occur. Therefore, variation in the urging force of the movable body 2 due to the leaf spring 6 can be suppressed, and the movable body 2 can be operated appropriately. In this case, the leaf spring 6 is first fixed to the base member 12 and then fixed to the sleeve 10.

  In the embodiment described above, the movable body fixing portion 5a of the leaf spring 5 is fixed to the sleeve 10 in contact with the fixing surface formed on the sleeve 10, and the fixed body fixing portion 5b is formed on the spring fixing portion 13a. The leaf spring 5 is bent while the sleeve 10 is bent so that a biasing force is generated to contact the reference surface 12b and the contact surface 10a. And fixed to the spacer 13. In addition to this, for example, the urging force of the leaf spring 5 is not used as the urging force for bringing the reference surface 12b and the contact surface 10a into contact with each other, and the reference surface 12b and the contact surface 10a are brought into contact with each other. When the biasing means is constituted by the drive magnet 15 and the magnetic member 18, the leaf spring 5 is biased by the leaf spring 5 when the reference surface 12b and the contact surface 10a are in contact with each other. It may be fixed to the sleeve 10 and the spacer 13 so as not to exist. In other words, the movable body fixing portion 5a is fixed to the sleeve 10 in contact with the fixing surface formed on the sleeve 10, and is fixed to the fixed body fixing portion 5b and the spring fixing portion 13a in the optical axis direction. The fixed body fixing portion 5b may be fixed to the spacer 13 so that a gap is formed between the surface and the surface. Further, the movable body fixing portion 5a is fixed to the sleeve 10 and fixed to the fixed body so that a gap is formed between the movable body fixing portion 5a and the fixed surface formed on the sleeve 10 in the optical axis direction. The portion 5b may be fixed to the spacer 13 in a state where the portion 5b is in contact with a fixing surface formed on the spring fixing portion 13a.

  In this case, it is possible to suppress variation in the urging force of the movable body 2 due to the leaf spring 6, and also to suppress variation in the urging force of the movable body 2 due to the leaf spring 5. As a result, variation in the urging force of the movable body 2 due to the leaf springs 5 and 6 can be suppressed, and the movable body 2 can be operated more appropriately.

  In the embodiment described above, the positioning protrusion 12d is formed on the fixed body side fixing surface 12c, but the positioning protrusion 12d may not be formed on the fixed body side fixing surface 12c. When the positioning protrusion 12d is not formed on the fixed body side fixing surface 12c, the inner peripheral surface of the through hole 6e formed in the fixing body fixing portion 6b and the positioning protrusion 12d do not come into contact with each other. Therefore, the leaf spring 6 can be fixed to the sleeve 10 and the base member 12 so that the biasing force by the leaf spring 6 when the contact surface 10a is in contact with the contact surface 10a does not occur more reliably.

  In the embodiment described above, four leaf springs 6 formed separately are arranged on the side opposite to the subject of the sleeve 10. In addition, for example, a leaf spring in which four leaf springs 6 are integrally formed may be disposed on the side opposite to the subject of the sleeve 10.

  In the embodiment described above, the drive coil 16 is attached to the movable body 2 and the drive magnet 15 is attached to the fixed body 3. However, the drive magnet 15 is attached to the movable body 2 and the drive body 15 is attached to the fixed body 3. A coil 16 may be attached. Further, in the above-described form, the lens driving device 1 is formed in a substantially quadrangular prism shape. However, the lens driving device 1 may be formed in a polygonal column shape such as a substantially hexagonal column shape, a columnar shape, an elliptical column shape, or the like. May be formed.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 4 Drive mechanism 5 Leaf spring (a part of biasing means)
6 leaf spring 6a movable body fixing portion 6b fixed body fixing portion 6c arm portion 6e through hole 10 sleeve 10a contact surface 10c movable body side fixing surface 12 base member 12b reference surface 12c fixed body side fixing surface 15 driving magnet (for biasing means) part)
16 Driving coil 18 Magnetic member (part of biasing means)
G Distance between movable body side fixed surface and fixed body side fixed surface L Optical axis t Thickness of leaf spring

Claims (7)

A movable body that holds a lens and is movable in the optical axis direction of the lens, a fixed body that holds the movable body so as to be movable in the optical axis direction, and a drive for driving the movable body in the optical axis direction With a mechanism,
A plate spring having a movable body fixing portion fixed to the movable body, a fixed body fixing portion fixed to the fixed body, and an arm portion connecting the movable body fixing portion and the fixed body fixing portion;
The fixed body is formed with a fixed body-side fixing surface for fixing the fixed body fixing portion and a reference surface for determining a reference position of the movable body in the optical axis direction ,
The movable body is formed with a movable body-side fixed surface for fixing the movable body fixing portion and a contact surface that contacts the reference surface ,
The leaf spring is configured such that the movable body fixing portion and the movable body side fixing surface are in contact with each other , and a gap is formed between the fixed body fixing portion and the fixed body side fixing surface in the optical axis direction. In addition, the leaf spring does not bend when the reference surface and the contact surface are in contact with each other using a gap between the fixed body fixing portion and the fixed body-side fixing surface. The fixed body is fixed to the movable body and the fixed body, or the fixed body fixing portion and the fixed body side fixed surface are in contact with each other , and the movable body fixed portion and the movable body side fixed surface are in the optical axis direction. The plate when the reference surface and the contact surface are in contact with each other using a clearance between the movable body fixing portion and the movable body side fixed surface so that a clearance is formed between them. as spring is not deflected, it is fixed to the movable body and the fixed body Lens driving device, characterized in that there. The distance between the movable body side fixed surface and the fixed body side fixed surface in the optical axis direction when the reference surface and the contact surface are in contact is larger than the thickness of the leaf spring. The lens driving device according to claim 1, wherein: The drive mechanism includes a drive coil attached to the movable body,
The end of the driving coil is connected to the leaf spring,
The leaf spring is in contact with the movable body fixing portion and the movable body side fixing surface, and a gap is formed between the fixed body fixing portion and the fixed body side fixing surface in the optical axis direction. The lens driving device according to claim 1, wherein the lens driving device is fixed to the movable body and the fixed body. Biasing means for contact with said and said reference plane abutment surface is arranged on one side of the movable body in the optical axis direction, the plate spring on the other side of the movable body in the optical axis direction The lens driving device according to claim 1, wherein the lens driving device is disposed.   5. The lens driving device according to claim 1, wherein the leaf springs are disposed on both sides of the movable body in the optical axis direction.   The lens driving device according to claim 1, wherein an adhesive curing portion in which the adhesive is cured is formed in the gap. A through hole penetrating in the optical axis direction is formed in the fixed body fixing portion,
The lens driving device according to any one of claims 1 to 6, wherein an adhesive curing portion in which an adhesive is cured is formed on an inner peripheral side of the through hole.

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