JP5898914B2 - 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.

  Conventionally, as a lens driving device for driving a photographing lens of a camera mounted on a mobile phone or the like, a lens holder that holds the lens and moves in the optical axis direction, and a fixed that holds the lens holder so as to be movable in the optical axis direction A lens driving device including a body and a driving mechanism having a driving coil and a driving magnet for driving the lens holder in the optical axis direction is known (for example, see Patent Document 1). In the lens driving device described in Patent Document 1, the fixed body includes a base member that constitutes the non-subject side portion of the fixed body, and a yoke that covers the outer periphery of the driving coil and the driving magnet.

  In this lens driving device, the lens holder can be moved in the optical axis direction by an upper leaf spring disposed on the subject side of the lens holder and a lower leaf spring disposed on the opposite side of the lens holder. It is supported by the fixed body so that The upper leaf spring includes an annular outer fixing portion fixed to the upper surface of the yoke, an annular inner fixing portion fixed to the upper end portion of the lens holder, and three arms connecting the outer fixing portion and the inner fixing portion. And. Further, the fixed body includes a cover member that covers the outer fixed portion of the upper leaf spring from the subject side. The cover member is fixed to the base member with a yoke sandwiched between the cover member and the base member. An adjustment plate for adjusting the spring constant of the upper leaf spring is disposed between the upper surface of the upper leaf spring and the cover member.

JP 2010-217665 A

  A lens driving device used for a camera mounted on a mobile phone or the like may be used in an environment with a relatively large amount of dust. If dust enters the inside of the lens driving device, the quality of an image taken by a camera equipped with the lens driving device may be deteriorated due to the influence of the dust that has entered the lens driving device. However, the lens driving device described in Patent Document 1 does not consider measures for preventing dust from entering the inside of the device.

  Therefore, an object of the present invention is to provide a lens driving device capable of suppressing dust from entering the inside of the device.

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 that drives the body in the optical axis direction, and a leaf spring that connects the movable body and the fixed body. The leaf spring includes a movable body fixing portion that is fixed to the movable body, and a fixed body that is fixed to the fixed body. A fixed portion, and an arm portion connecting the movable body fixed portion and the fixed body fixed portion. The fixed body is formed of a metal material and covers the outer peripheral side of the drive mechanism and is fixed to one end surface in the optical axis direction. A cover member that is fixed to the cover member, a second cover member that is formed of a metal material and that is fixed to the cover member on one end side in the optical axis direction so as to cover the fixed body fixing portion, and an annularly formed cover member and second member The sealing member made of elastomer disposed between the cover member It comprises a second cover member includes a peripheral wall portion formed so and annular as rises in the optical axis direction, are fixed from the outside of the side surface of the substantially parallel cover member to the side surface of the cover member in the optical axis direction A fixed portion is formed with welding marks, the fixed portion is formed so as to be connected to the outer peripheral wall portion, and the seal member is disposed on the inner peripheral side of the outer peripheral wall portion. At the same time, it is sandwiched between the cover member and the second cover member in a state compressed in the optical axis direction, and a gap is formed between the seal member and the outer peripheral wall portion in the vicinity of the fixed portion. It is characterized by.

In the lens driving device of the present invention, the fixing member fixing portion of the leaf spring is fixed to one end surface in the optical axis direction of the cover member covering the outer peripheral side of the driving mechanism, and is fixed to the cover member on one end side in the optical axis direction. The fixed body fixing portion is covered by the two cover members. In the present invention, an elastomeric seal member compressed in the optical axis direction is sandwiched between the cover member and the second cover member. Therefore, even when the second cover member is provided so as to cover the fixed body fixing portion of the leaf spring, the gap between the cover member and the second cover member may be filled with the seal member. It becomes possible. Therefore, in the present invention, it is possible to prevent dust from entering the lens driving device from between the cover member and the second cover member. As a result, dust enters the lens driving device. Can be suppressed.

In the present invention, since the elastomer seal member is disposed between the cover member and the second cover member, a situation such as the lens driving device dropping occurs, and the second cover member is impacted. This impact can be mitigated by the sealing member even if the pressure is applied. Therefore, according to the present invention, it is possible to improve the impact resistance of the lens driving device. In the present invention, since the elastomer seal member is disposed between the cover member and the second cover member, vibration when the movable body moves in the optical axis direction can be absorbed by the seal member. It becomes possible. Therefore, according to the present invention, it is possible to suppress vibrations or the like of the camera casing to which the lens driving device is attached.

In the present invention , the cover member and the second cover member are formed of a metal material, and the second cover member extends from the outside of the side surface of the cover member substantially parallel to the optical axis direction to the side surface of the cover member. Since the fixed portion to be fixed by welding is provided , it is possible to adjust the fixing position of the second cover member relative to the cover member in the optical axis direction by changing the compression amount of the seal member. Therefore, even if the components constituting the lens driving device vary, it is possible to suppress the dimensional variation of the lens driving device in the optical axis direction and increase the dimensional accuracy of the lens driving device in the optical axis direction. Moreover, since the fixed part formed in the second cover member is fixed by welding from the outside of the side surface of the cover member to the side surface of the cover member, when fixing the second cover member to the cover member by welding, It is easy to adjust the fixing position of the second cover member in the optical axis direction. In the present invention, the second cover member includes an outer peripheral wall portion that is formed in an annular shape so as to rise in the optical axis direction, the fixed portion is formed to be connected to the outer peripheral wall portion, and the seal member is Since the gap is formed between the seal member and the outer peripheral wall in the vicinity of the fixed part, the ring is compressed in the optical axis direction. It is possible to prevent the seal member that has spread in the direction orthogonal to the optical axis direction from pushing the portion of the outer peripheral wall near the fixed portion to the outer peripheral side. Therefore, the side surface of the cover member and the fixed portion can be securely adhered, and the side surface of the cover member and the fixed portion can be reliably welded.

  In this invention, it is preferable that the to-be-fixed part is formed with the convex part which protrudes toward the side surface of a cover member. If comprised in this way, it will become possible to contact | adhere the side surface of a cover member, and a to-be-fixed part using a convex part. Therefore, the side surface of the cover member and the fixed portion can be reliably welded, and the fixing strength between the side surface of the cover member and the fixed portion can be increased.

  In the present invention, the fixed body includes a fixing member to which the fixed body fixing portion is fixed, and the fixing member holds the optical axis in a state where the fixed body fixing portion is sandwiched between one end surface of the cover member in the optical axis direction. Preferably, the seal member is fixed to one end face of the cover member in the direction, and is disposed between the fixing member and the second cover member so as to overlap the fixing member. If comprised in this way, it will become possible to raise the intensity | strength of a fixed body fixing | fixed part with a fixing member. Therefore, if the fixed body fixing portion is fixed to the fixing member before fixing the fixed body fixing portion to the one end surface of the cover member, the fixed body fixing when fixing the fixed body fixing portion to the one end surface of the cover member is performed. It becomes possible to prevent the deformation of the part. As a result, it is possible to stabilize the spring characteristics of the leaf spring. Also, with this configuration, the seal member is disposed between the fixing member and the second cover member so as to overlap the fixing member, and thus, between the cover member and the second cover member. Even when the fixing member is provided on the lens, the sealing member can prevent dust from entering the lens driving device from between the cover member and the second cover member.

  As described above, according to the present invention, it is possible to suppress dust from entering the lens driving device.

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 figure which shows the state by which the sealing member is arrange | positioned inside the cylinder part of the 2nd cover member shown in FIG. 3 from the non-subject side. FIG. 4 is a plan view for explaining the positional relationship among a sleeve, a driving magnet, and a driving coil shown in FIG.

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

(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 view showing a state in which the seal member 13 is disposed inside the cylindrical portion 9b of the cover member 9 shown in FIG. FIG. 5 is a plan view for explaining the positional relationship among the sleeve 8, the driving magnet 15 and the driving coil 16 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 the X direction, the Y direction, and the 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. And Further, in FIG. 1 and the like, 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 (rear)” side, and the Z1 direction side is “ The “upper” side and the Z2 direction side are 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. That is, 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). In the present embodiment, the upper side is one end side in the optical axis direction.

  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. In addition, the lens driving device 1 includes leaf springs 5 and 6 that connect the movable body 2 and the fixed body 3. 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 9 as a second cover member that constitutes the upper end surface of the lens driving device 1, a cover member 10 that constitutes the four side surfaces of the lens driving device 1, and the lower end surface of the lens driving device 1. , A spacer 12 as a fixing member to which a part of the leaf spring 5 is fixed, a seal member 13 disposed between the cover member 9 and the cover member 10, and a driving coil to be described later 16 is provided with two power supply terminals 14 for supplying current to 16. In FIGS. 2 and 3, the lens holder 7 is not shown.

  The lens holder 7 is formed in a substantially cylindrical shape. A plurality of lenses having a substantially circular shape when viewed from the optical axis direction are fixed to the inner peripheral side of the lens holder 7.

  The sleeve 8 is formed of, for example, a resin material and has a substantially cylindrical shape. Specifically, the sleeve 8 is formed in a substantially cylindrical shape in which the shape of the inner peripheral surface when viewed from the vertical direction is substantially circular, and the shape of the outer peripheral surface when viewed from the vertical direction is substantially octagonal. ing. Projections 8a projecting in the directions of the four corners of the lens driving device 1 are formed on the lower end side of the sleeve 8, and the shape of the lower end side portion of the sleeve 8 when viewed from above and below is substantially square. It has become. The sleeve 8 holds the lens holder 7 on its inner peripheral side. That is, the outer peripheral surface of the lens holder 7 is fixed to the inner peripheral surface of the sleeve 8.

  The cover member 10 is formed of a magnetic material and a metal material. For example, the cover member 10 is formed of a magnetic steel plate. 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. A through hole 10c is formed at the center of the bottom 10a disposed on the upper side. The four front, rear, left and right side surfaces constituting the cylindrical portion 10b are arranged substantially parallel to the vertical direction. The cover member 10 is disposed so as to surround most of the movable body 2 except a part on the upper end side and the outer peripheral side of the drive mechanism 4.

  The left and right side surfaces of the cylindrical portion 10b are formed in a planar shape. On the other hand, projecting portions 10d that project outward in the front-rear direction are formed on the front and rear side surfaces of the cylindrical portion 10b. The protruding portion 10d is formed at the center position in the left-right direction on the front and back side surfaces of the cylindrical portion 10b.

  The cover member 9 is made of a metal material. For example, the cover member 9 is formed of a nonmagnetic stainless steel plate. Moreover, the cover member 9 is formed in the substantially square cylinder shape with the bottom which has the bottom part 9a and the cylinder part 9b. The vertical width of the cylindrical portion 9 b is narrower than the vertical width of the cylindrical portion 10 b of the cover member 10. A through hole 9c is formed at the center of the bottom portion 9a disposed on the upper side. The four front, rear, left and right side surfaces constituting the cylindrical portion 9b are arranged substantially parallel to the vertical direction. The cylindrical portion 9b of the present embodiment is an outer peripheral wall portion that is formed in an annular shape so as to rise downward. The cover member 9 may be formed of a magnetic material.

  The left and right side surfaces of the cylindrical portion 9b are formed in a planar shape. On the other hand, on the front and back side surfaces of the cylindrical portion 9b, a protruding portion 9e that protrudes outward in the front-rear direction is formed so as to correspond to the shape of the cylindrical portion 10b of the cover member 10. The protruding portion 9e is formed at the center position in the left-right direction on the front and back side surfaces of the cylindrical portion 9b.

  The cover member 9 is fixed to the upper end side of the cover member 10 by welding so as to cover a fixed body fixing portion 5b, which will be described later, constituting the leaf spring 5, and constitutes the upper end side portion of the lens driving device 1 and is fixed. The upper end side part of the body 3 is comprised. The cover member 9 is disposed so as to surround a part of the outer peripheral side on the upper end side of the movable body 2.

  A fixed portion 9d to be fixed to the cover member 10 by welding is formed on the tube portion 9b. The fixed portion 9d is formed so as to be connected to the lower end of the cylindrical portion 9b. The fixed portion 9d is formed so as to protrude downward from both sides of the protruding portion 9e in the left-right direction (that is, from the left and right end sides of the front and rear sides of the cylindrical portion 9b). That is, the fixed part 9d is formed in four places. Further, the fixed portion 9d is formed in a substantially square shape. The fixed portion 9d is disposed outside the front and back side surfaces of the cylindrical portion 10b of the cover member 10 in the front-rear direction. 9 d of to-be-fixed parts are being fixed to the side surface before and behind the cylinder part 10b from the outer side of the front and back sides of the cylinder part 10b by welding.

  The fixed portion 9d before being welded to the cylindrical portion 10b is formed with a convex portion 9f that protrudes inward in the front-rear direction. That is, the fixed part 9d before being welded to the cylinder part 10b is formed with a convex part 9f that protrudes toward the front and rear side surfaces of the cylinder part 10b. The convex portion 9f is formed by half-cutting a part of the fixed portion 9d toward the inner side in the front-rear direction. Moreover, the convex part 9f is formed so that the shape when it sees from the front-back direction may become a substantially circular shape.

  When the fixed portion 9d is disposed on the outer side of the front and back sides of the cylindrical portion 10b when the fixed portion 9d is welded to the front and rear side surfaces of the cylindrical portion 10b, the convex portion 9f contacts the front and rear side surfaces of the cylindrical portion 10b. . In this embodiment, the fixed portion 9d is welded and fixed to the front and back side surfaces of the cylindrical portion 10b by irradiating the portion of the fixed portion 9d where the convex portion 9f is formed with laser light. That is, after welding the cylindrical portion 10b and the fixed portion 9d, the cylindrical portion 10b and the fixed portion 9d are connected to each other at and near the portion of the fixed portion 9d where the convex portion 9f is formed. A welding mark remains in the portion of the fixed portion 9d where the convex portion 9f is formed and in the vicinity thereof. Moreover, even after welding of the cylindrical portion 10b and the fixed portion 9d, a part of the convex portion 9f may remain.

  The base member 11 is formed of an insulating 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 fixed to the lower end side of the cover member 10 and constitutes a lower end side portion of the lens driving device 1 and constitutes a lower end side portion of the fixed body 3. A through hole 11 a is formed at the center of the base member 11.

  The leaf spring 5 is an annular movable body fixing portion 5 a fixed to the upper end side of the sleeve 8, and a substantially square frame that is disposed on the outer peripheral side of the movable body fixing portion 5 a and is fixed to the spacer 12 and the cover member 10. The fixed body fixing | fixed part 5b of a shape, and the four arm parts 5c which connect the movable body fixing | fixed part 5a and the fixed body fixing | fixed part 5b are provided. The leaf spring 5 is fixed to the sleeve 8, the cover member 10, and the spacer 12 so that the thickness direction and the vertical direction of the movable body fixing portion 5 a and the fixed body fixing portion 5 b substantially coincide with each other.

  The leaf spring 6 is a substantially semicircular arc-shaped movable body fixing portion 6 a fixed to the lower end side of the sleeve 8, and is disposed on the outer peripheral side of the movable body fixing portion 6 a and fixed to the base member 11. Each fixed body fixing portion 6b, and two arm portions 6c that connect the movable body fixing portion 6a and the fixed body fixing portion 6b. The leaf spring 6 is fixed to the sleeve 8 and the base member 11 so that the thickness direction and the vertical direction of the movable body fixing portion 6a and the fixed body fixing portion 6b substantially coincide with each other. Each of the two leaf springs 6 is fixed by soldering or the like at both ends of a driving coil 16 that will be described later that constitutes the driving mechanism 4.

  The spacer 12 is formed of a metal material and is formed in a substantially square frame shape. The thickness of the spacer 12 in the vertical direction is larger than the thickness of the leaf spring 5. The upper surface of the fixed body fixing portion 5b of the leaf spring 5 is fixed to the lower surface of the spacer 12, and the spacer 12 and the fixed body fixing portion 5b overlap. In this embodiment, the shape of the spacer 12 when viewed from the vertical direction is substantially the same as the shape of the fixed body fixing portion 5b when viewed from the vertical direction, and the spacer 12 when viewed from the vertical direction. And the fixed body fixing | fixed part 5b have overlapped substantially completely. In this embodiment, after the upper surface of the fixed body fixing portion 5 b is fixed to the lower surface of the spacer 12, the lower surface of the fixed body fixing portion 5 b is fixed to the upper surface of the bottom portion 10 a of the cover member 10 by bonding or the like. That is, the spacer 12 is fixed to the upper surface of the bottom portion 10a via the fixed body fixing portion 5b with the fixed body fixing portion 5b sandwiched between the spacer 12 and the upper surface of the bottom portion 10a.

The seal member 13 is formed of an elastomer that is an industrial material having rubber-like elasticity. For example, the seal member 13 is formed of a damping rubber that is excellent in shock absorption and vibration absorption. The seal member 13 is formed in a substantially square frame shape (annular shape). The seal member 13 is fixed to the lower surface of the bottom portion 9a of the cover member 9 by adhesion, and is disposed between the upper surface of the spacer 12 and the lower surface of the bottom portion 9a. That is, the seal member 13 is disposed between the upper surface of the bottom portion 10 a of the cover member 10 and the lower surface of the bottom portion 9 a of the cover member 9. The seal member 13 is formed so as to cover the entire spacer 12 when viewed from the vertical direction. In this embodiment, the seal member 13 is disposed so as to overlap the spacer 12 and covers the entire spacer 12 from above.

  Further, the seal member 13 is disposed on the inner peripheral side of the cylindrical portion 9 b of the cover member 9. As shown in FIG. 4, the seal member 13 has an outer peripheral end in contact with the inner surface of the protruding portion 9 e of the cylindrical portion 9 b, and a gap is formed between the left and right inner surfaces of the cylindrical portion 9 b and the outer peripheral end. Formed and arranged to form. Further, at the four corners of the seal member 13 are formed substantially arc-shaped convex portions 13a protruding outward in the front-rear direction, and the outer ends of the convex portions 13a in the front-rear direction are on the inner front and rear surfaces of the cylindrical portion 9b. It is in contact. In addition, a gap S is formed between the portion of the outer peripheral end of the seal member 13 between the portion that contacts the inner surface of the protruding portion 9e and the convex portion 13a and the inner surface before and after the cylindrical portion 9b. ing. The gap S is formed so as to correspond to the place where the fixed portion 9d is formed. That is, a gap S is formed between the seal member 13 and the cylindrical portion 9b in the vicinity of the fixed portion 9d.

  As described above, the cover member 9 is fixed to the upper end side of the cover member 10 by welding. In this embodiment, the seal member 13 is sandwiched between the spacer 12 and the bottom portion 9a of the cover member 9 in a state compressed in the vertical direction.

  The power supply terminal 14 is formed by bending a conductive flat metal material. The power feeding terminal 14 is fixed to the base member 11. In addition, each of the two leaf springs 6 is fixed to each of the two power supply terminals 14 by soldering or the like, and is electrically connected.

  The driving mechanism 4 includes four driving magnets 15 having a substantially triangular prism shape disposed at four corners of the lens driving device 1 (specifically, four corners inside the cover member 10) and one piece fixed to the sleeve 8. The drive coil 16 is provided.

  The drive magnet 15 is formed so as to have a substantially right triangle when viewed from above and below, and includes rectangular side surfaces 15a and 15b that are substantially parallel to the optical axis L and orthogonal to each other. The driving magnet 15 is disposed so that the inner peripheral surface of the cylindrical portion 10b of the cover member 10 and the side surfaces 15a and 15b are substantially parallel to each other with a predetermined gap therebetween. Further, the upper end surfaces of the four drive magnets 15 are fixed to the bottom portion 10 a of the cover member 10.

  A magnetic member 17 made of a magnetic material is fixed to the lower end surface of the drive magnet 15. The magnetic member 17 is formed in a flat plate shape having a substantially right triangular shape similar to that of the drive magnet 15 when viewed from the vertical direction, and includes two end surfaces 17a and 17b orthogonal to each other. The magnetic member 17 is fixed to the lower end surface of the driving magnet 15 so that the thickness direction and the vertical direction substantially coincide with each other.

  The driving magnet 15 is magnetized to have two poles in the vertical direction so that the magnetic pole on the upper end surface is different from the magnetic pole on the lower end surface. Therefore, for example, in the lens driving device 1, while passing through the cylindrical portion 10b, the bottom portion 10a, the driving magnet 15 and the magnetic member 17 of the cover member 10, the lower surface and the end surface of the magnetic member 17 are connected to the inner peripheral surface of the cylindrical portion 10b. A magnetic field that wraps around is formed. Note that the magnetic field also circulates from the vicinity of the contact portion between the lower end surface of the drive magnet 15 and the upper surface of the magnetic member 17 toward the inner peripheral surface of the cylindrical portion 10b.

  The driving coil 16 is wound in a flat and substantially rectangular tube shape so that the shape when viewed from the up and down direction is a substantially square shape. The driving coil 16 is fixed to the upper surface of the protruding portion 8 a of the sleeve 8. The driving coil 16 is disposed along the inner peripheral surface of the cylindrical portion 10b of the cover member 10, and the four corners of the driving coil 16 and the vicinity thereof are the side surfaces 15a and 15b of the driving magnet 15 and the magnetic member. 17 is disposed in a gap between the end surfaces 17a and 17b of the 17 and the cylindrical portion 10b of the cover member 10.

  Further, the four corners of the driving coil 16 and the vicinity thereof are arranged in a magnetic field that wraps around from the lower surface and end surfaces 17a and 17b of the magnetic member 17 toward the inner peripheral surface of the cylindrical portion 10b. In this embodiment, the driving coil 16 is arranged so that the magnetic member 17 is always arranged on the inner peripheral side of the driving coil 16 in the movable range of the movable body 2. When a current is supplied to the driving coil 16, the movable body 2 moves in the vertical direction (optical axis direction) by the action of the driving magnet 15 and the driving coil 16.

(Main effects of this form)
As described above, in this embodiment, the seal member 13 that is compressed in the vertical direction is disposed between the bottom portion 10 a of the cover member 10 and the bottom portion 9 a of the cover member 9. Therefore, even when the cover member 9 is provided so as to cover the fixed body fixing portion 5b of the leaf spring 5, the gap between the cover member 9 and the cover member 10 may be filled with the seal member 13. It becomes possible. Therefore, in this embodiment, dust is prevented from entering the lens driving device 1 from between the cover member 9 and the cover member 10 (specifically, from between the tube portion 9b and the tube portion 10b). As a result, it is possible to prevent dust from entering the lens driving device 1.

Further, in this embodiment, since the elastomer seal member 13 is disposed between the cover member 9 and the cover member 10, a situation such as the lens driving device 1 dropping occurs, and the cover member 9 is impacted. Even if applied, the impact can be mitigated by the seal member 13. Therefore, in this embodiment, the impact resistance of the lens driving device 1 can be improved. In this embodiment, since the elastomer seal member 13 is disposed between the cover member 9 and the cover member 10, the seal member 13 absorbs vibration when the movable body 2 moves in the vertical direction. Is possible. Therefore, in this embodiment, it is possible to suppress vibrations of the housing of the camera to which the lens driving device 1 is attached.

  In this embodiment, the fixed portion 9d of the cover member 9 is fixed by welding from the outside of the front and back side surfaces of the cylindrical portion 10b of the cover member 10 to the front and back side surfaces of the cylindrical portion 10b. Therefore, the fixing position of the cover member 9 with respect to the cover member 10 can be adjusted in the vertical direction by changing the compression amount of the seal member 13. Specifically, the compression amount of the seal member 13 is changed using a predetermined jig so that the height of the lens driving device 1 in the vertical direction is substantially constant, so that the cover member 9 is moved relative to the cover member 10. The fixed position can be adjusted. Therefore, in this embodiment, even if the components constituting the lens driving device 1 vary, the dimensional accuracy of the lens driving device 1 in the vertical direction is improved by suppressing the dimensional variation of the lens driving device 1 in the vertical direction. Is possible. Further, in this embodiment, the fixed portion 9d is fixed by welding from the outside of the front and back side surfaces of the cylindrical portion 10b to the front and rear side surfaces of the cylindrical portion 10b. Therefore, when the cover member 9 is fixed to the cover member 10 by welding. It becomes easy to adjust the fixing position of the cover member 9 in the vertical direction.

  In this embodiment, the fixed portion 9d before being welded to the cylindrical portion 10b is formed with a convex portion 9f that protrudes toward the front and rear side surfaces of the cylindrical portion 10b. Therefore, the front and rear side surfaces of the cylindrical portion 10b can be brought into close contact with the fixed portion 9d using the convex portion 9f. Therefore, in this embodiment, it is possible to reliably weld the front and rear side surfaces of the cylindrical portion 10b and the fixed portion 9d, and increase the fixing strength between the front and rear side surfaces of the cylindrical portion 10b and the fixed portion 9d. It becomes possible.

  In this embodiment, a gap S is formed between the seal member 13 and the cylindrical portion 9b in the vicinity of the fixed portion 9d. Therefore, it is possible to prevent the seal member 13 compressed in the vertical direction and expanded in the front-rear direction from pushing the portion in the vicinity of the fixed portion 9 d of the cylindrical portion 9 b to the outer peripheral side. Therefore, in this embodiment, the fixed portion 9d connected to the lower end of the cylindrical portion 9b and the front and rear side surfaces of the cylindrical portion 10b are securely adhered, and the front and rear side surfaces of the cylindrical portion 10b and the fixed portion 9d are reliably welded. It becomes possible to do. Further, in this embodiment, convex portions 13a are formed at the four corners of the seal member 13, and the outer ends of the convex portions 13a in the front-rear direction are in contact with the front and rear inner surfaces of the cylindrical portion 9b. Even if a gap S is formed between the seal member 13 and the cylindrical portion 9b in the vicinity of the, the positional deviation of the seal member 13 with respect to the cover member 9 can be prevented.

  In this embodiment, the fixed body fixing portion 5 b is fixed to the bottom portion 10 a of the cover member 10 after the fixed body fixing portion 5 b is fixed to the metal spacer 12 thicker than the plate spring 5. Therefore, compared with the case where the fixed body fixing portion 5b not fixed to the spacer 12 is fixed to the bottom portion 10a, the deformation of the fixed body fixing portion 5b when fixing the fixed body fixing portion 5b to the bottom portion 10a is reduced. It becomes possible to prevent. Therefore, in this embodiment, the spring characteristics of the leaf spring 5 can be stabilized.

  In this embodiment, the seal member 13 is disposed so as to overlap the spacer 12. Therefore, even if the spacer 12 is provided between the cover member 9 and the cover member 10, the seal member 13 prevents dust from entering the lens driving device 1 from between the cover member 9 and the cover member 10. It becomes possible to prevent.

(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, the convex portion 9f is formed on the fixed portion 9d before being welded to the cylindrical portion 10b, but the convex portion 9f is formed on the fixed portion 9d before being welded to the cylindrical portion 10b. It is not necessary. In this case, for example, the fixed portion 9d is welded to the front and back side surfaces of the cylindrical portion 10b by irradiating laser light to the contact portion between the lower end surface of the fixed portion 9d and the front and rear side surfaces of the cylindrical portion 10b. Fixed. However, in this case, the laser beam is reflected by the lower end surface of the fixed portion 9d, and for example, the reflected laser beam may be irradiated onto the base member 11. When the resin base member 11 is irradiated with laser light, the base member 11 may be melted. Therefore, it is preferable that the fixed portion 9d before being welded to the cylindrical portion 10b is formed with a convex portion 9f.

  In the embodiment described above, the fixed portion 9d is formed on the cylindrical portion 9b, but the fixed portion 9d may not be formed on the cylindrical portion 9b. In this case, for example, a contact portion that contacts the upper surface of the bottom portion 10a of the cover member 10 is formed on the cover member 9, and the contact member is irradiated with laser light from the upper side, so that the cover member is welded. The cover member 9 may be fixed to 10. In this case, since it is difficult to adjust the fixing position of the cover member 9 with respect to the cover member 10 in the vertical direction, it is preferable that the fixed portion 9d is formed in the cylindrical portion 9b.

  In the embodiment described above, after the upper surface of the fixed body fixing portion 5b is fixed to the lower surface of the spacer 12, the lower surface of the fixed body fixing portion 5b is fixed to the upper surface of the bottom portion 10a of the cover member 10 by bonding or the like. In addition, for example, when the spacer 12 is formed larger than the fixed body fixing portion 5b when viewed from the top and bottom direction, after the upper surface of the fixed body fixing portion 5b is fixed to the lower surface of the spacer 12, The lower surface of the spacer 12 may be fixed to the upper surface of the bottom portion 10a. In other words, the fixed body fixing portion 5b may be fixed to the bottom portion 10a via the spacer 12. At this time, the lower surface of the spacer 12 may be fixed to the bottom 10a by adhesion, but is fixed to the bottom 10a by welding. That is, at this time, the spacer 12 is joined to the bottom portion 10 a by welding, whereby the fixed body fixing portion 5 b is fixed to the bottom portion 10 a via the spacer 12. Further, the spacer 12 may not be disposed between the fixed body fixing portion 5b and the seal member 13. Moreover, in the form mentioned above, although the cover member 9 and the sealing member 13 are formed separately, the cover member 9 and the sealing member 13 may be integrally formed.

  In the embodiment described above, the drive mechanism 4 is formed in a substantially triangular prism shape and disposed at the four corners of the lens driving device 1, and the outer periphery side of the drive magnet 15 formed by being wound in a substantially rectangular tube shape. And a driving coil 16 disposed on the surface. In addition to this, for example, the drive mechanism 4 is disposed along each of the drive coil wound on the outer peripheral side of the sleeve 8 and the four side surfaces of the lens drive device 1 and faces the outer peripheral surface of the drive coil. A driving magnet may be provided. Further, the drive mechanism 4 may include a drive coil wound around the outer periphery of the sleeve 8 and a drive magnet disposed at the four corners of the lens driving device 1 and facing the outer peripheral surface of the drive coil. .

  In the embodiment described above, the lens driving device 1 is formed so that the shape when viewed from the optical axis direction is a substantially square shape, but the lens driving device 1 has a shape when viewed from the optical axis direction. You may form so that it may become a substantially rectangular shape. Further, the lens driving device 1 may be formed so that the shape when viewed from the optical axis direction is a polygonal shape such as a substantially hexagonal shape, or the shape when viewed from the optical axis direction is a circular shape or an oval shape. You may form so that it may become a shape.

DESCRIPTION OF SYMBOLS 1 Lens drive device 2 Movable body 3 Fixed body 4 Drive mechanism 5 Leaf spring 5a Movable body fixed part 5b Fixed body fixed part 5c Arm part 9 Cover member (2nd cover member)
9b Tube (outer peripheral wall)
9d Fixed part 9f Convex part 10 Cover member 12 Spacer (fixing member)
13 Seal member L Optical axis S Clearance Z Optical axis direction Z1 One end side of optical axis direction

Claims (3)

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 mechanism that drives the movable body in the optical axis direction A leaf spring connecting the movable body and the fixed body,
The leaf spring includes 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 of a metal material and covers the outer peripheral side of the drive mechanism, and the cover is fixed to one end surface in the optical axis direction, and the fixed body fixed portion is formed of a metal material. A second cover member fixed to the cover member on one end side in the optical axis direction so as to cover, and made of an elastomer formed in an annular shape and disposed between the cover member and the second cover member A sealing member,
Said second cover member is solid and the outer peripheral wall portion formed rises manner and annular to the optical axis direction, from the outer side surface of the substantially parallel said cover member to said optical axis direction on the side surface of the cover member With fixed parts to be fixed,
A weld mark is formed on the fixed part,
The fixed part is formed to be connected to the outer peripheral wall part,
The seal member is disposed on the inner peripheral side of the outer peripheral wall portion and is sandwiched between the cover member and the second cover member in a state compressed in the optical axis direction,
In the vicinity of the fixed portion, a gap is formed between the seal member and the outer peripheral wall portion. Wherein the fixed portion includes a lens driving apparatus according to claim 1, wherein a protrusion protruding toward a side surface of the cover member is formed. The fixed body includes a fixing member to which the fixed body fixing portion is fixed,
The fixing member is fixed to one end surface of the cover member in the optical axis direction in a state where the fixing body fixing portion is sandwiched between the fixing member and one end surface of the cover member in the optical axis direction.
The seal member, the between the stationary member and the second cover member, and a lens driving device according to claim 1 or 2, characterized in that it is arranged so as to overlap with the fixing member.

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