JP2018054812A - Lens drive device, camera device, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive device capable of suppressing vibration of a mover and a plate spring, a camera device, and an electronic apparatus.SOLUTION: A lens drive device 10 includes: a stator 12; a mover 14 that contains a lens support 30 for holding a lens and moves in an optical axis direction of the lens relative to the stator 12; a stator side stationary section fixed onto the stator; a mover side stationary section fixed onto the mover; and an arm section for coupling the stator side stationary section with the mover side stationary section. The lens drive device also includes: plate springs 38 and 40 for movably supporting the mover relative to the stator; and resin having viscoelasticity for acting as a bridge connecting the arm section and the mover.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens driving device, a camera device, and an electronic apparatus.

  Electronic devices such as mobile phones and smartphones are equipped with small cameras. As this type of small camera, for example, as shown in Patent Document 1 and Patent Document 2, a camera having an autofocus function is known.

US Patent Application Publication No. 2015/0153540 JP 2011-154121 A

  In the said patent document 1, in order to suppress the vibration of a mover, the buffer material is provided between the stator and the mover. Moreover, in patent document 2, the shock absorbing material is provided in the spring member which supports a mover.

  It is an object of the present invention to provide a lens driving device, a camera device, and an electronic apparatus that can suppress vibrations of a mover and a leaf spring.

  The first feature of the present invention includes a stator, a lens support for holding the lens, a mover that moves in the optical axis direction of the lens with respect to the stator, and a stator side fixing portion that is fixed to the stator. And a mover-side fixing portion fixed to the mover, and an arm portion connecting the stator-side fixing portion and the mover-side fixing portion, and a plate that supports the mover movably with respect to the stator The lens driving device includes a spring and a viscoelastic resin that bridges the arm and the mover.

  Preferably, the resin bridges the surface of the mover whose normal direction is the optical axis direction and the surface of the arm portion facing the surface of the mover.

  Preferably, the leaf spring has a front leaf spring that supports the mover on the front side of the mover and a rear leaf spring that supports the mover on the rear side of the mover, and the resin has a front side. The face of the mover facing and the face of the front leaf spring facing the face of the mover and facing the rear side, and the face of the mover facing the rear side and the face of the mover facing the front side and facing the front side The surfaces of the rear leaf springs are bridged.

  Preferably, the resin bridges the surface of the mover whose normal direction is a direction orthogonal to the optical axis and the surface of the arm portion facing the surface of the mover.

  Preferably, a concave groove for accommodating the resin is provided on the surface of the mover. Alternatively, a concave groove may be provided on the surface of the mover, and the resin may be provided on the stator side fixing portion side adjacent to the concave groove.

  Preferably, the arm portion includes a bending portion connected to the stator side fixing portion, and a straight portion extending from the bending portion to the mover side fixing portion, and the resin is formed on the arm portion. The arm portion and the mover are bridged at the straight portion.

  Preferably, the resin is provided at a position closer to the mover side fixing portion than the stator side fixing portion.

  Preferably, a lens fixing hole for fixing a lens is provided at the center of the mover, and a protrusion protruding in the optical axis direction between the surface of the mover and the lens fixing hole. Is provided.

  Preferably, the distance in the optical axis direction between the stator side fixing portion of the front leaf spring and the stator side fixing portion of the rear leaf spring is equal to the mover side fixing portion of the front leaf spring. It is larger than the distance in the optical axis direction between the rear leaf spring and the mover side fixing portion.

  The second feature of the present invention is that a lens support for holding a lens, a housing for housing the lens support, a front leaf spring and a rear leaf spring for supporting the lens support with respect to the housing. And the front leaf spring is connected to the front side surface of the housing facing the front side of the optical axis direction of the lens and the front side surface of the lens support, and the rear leaf spring is a light beam of the lens. The lens driving device is connected to a rear side surface of the casing facing the rear side in the axial direction and a rear side surface of the lens support.

  Preferably, the housing has a quadrangular shape when viewed from the optical axis direction, and the front side surface and the rear side surface of the housing are formed so as to protrude inward from the respective corners of the square shape.

  The third feature of the present invention is provided with a lens support for holding the lens, a housing for housing the lens support, and a leaf spring for supporting the lens support with respect to the housing, Either the outer peripheral surface of the lens support body or the inner peripheral surface of the housing has a protruding portion that protrudes from a part in the circumferential direction toward the other, and the other accommodates the protruding portion. The lens driving device has a recess.

  According to a fourth aspect of the present invention, there is provided a lens support body having a lens fixing hole for fixing a lens in the center thereof, a housing for housing the lens support body, a magnet fixed to the lens support body, A coil that is fixed to the housing so as to face the magnet, and the lens support has a rectangular shape when viewed from the optical axis direction of the lens, and a magnet fixing portion for fixing the magnet is the square. The lens driving device is provided on a side portion corresponding to a side portion of the shape, and the magnet fixing portion has a magnet placement portion on which the magnet is placed so as to be formed in a planar shape so as to bend the side portion. .

  Preferably, the magnet mounting portion has a hollow portion that further has at least one of circumferential end portions thereof.

  A fifth feature of the present invention resides in a camera device comprising any of the lens driving devices described above, a lens held by the lens support, and a light receiving sensor that detects light transmitted through the lens. .

  According to a sixth aspect of the present invention, there is provided an electronic apparatus including any one of the lens driving devices described above, a lens held by the lens support, and a light receiving sensor that detects light transmitted through the lens. .

  According to the present invention, since the resin having viscoelasticity is bridged between the mover and the leaf spring, the vibration of the mover and the leaf spring can be suppressed.

It is a disassembled perspective view which shows the lens drive device which concerns on 1st embodiment of this invention. It is the perspective view seen from the front side which shows the lens drive device which concerns on 1st embodiment of this invention. It is the perspective view seen from the back which shows the lens drive device concerning a first embodiment of the present invention. It is a perspective view which shows the front side leaf | plate spring and rear side leaf | plate spring which were used for 1st embodiment of this invention. In the lens drive device concerning a first embodiment of the present invention, it is a top view except a case. In the lens drive device concerning a first embodiment of the present invention, it is a bottom view except a case. In the lens drive device concerning a first embodiment of the present invention, it is a longitudinal section except a case. FIG. 8 is a cross-sectional perspective view taken along line AA of FIG. 7 in the lens driving device according to the first embodiment of the present invention. In 1st embodiment of this invention, it is a top view which shows the relationship between the protrusion part of a lens support body, and the recessed part of a flame | frame. In the lens drive device concerning a first embodiment of the present invention, it is a sectional view showing the relation between a position detection part and a position detection magnet. In the lens drive device which concerns on 1st embodiment of this invention, it is a cross-sectional view which shows the relationship between a lens support body and a drive magnet. In the lens drive device concerning a first embodiment of the present invention, it is a sectional view showing the relation between the arm part of a front leaf spring or a rear leaf spring, and a lens support. In the lens drive device which concerns on 2nd embodiment of this invention, it is a top view which shows the relationship between viscoelastic resin and a protrusion part. In the lens drive device concerning a third embodiment of the present invention, it is a sectional view showing the relation between the arm part of a front side leaf spring, and a lens support.

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

  In FIG. 1, a lens driving device 10 is used in an autofocus small camera used in an electronic device such as a mobile phone or a smartphone. In this specification, for convenience, one direction in the optical axis direction of the lens driving device 10 is referred to as a front side, and the other direction is referred to as a rear side.

  The lens driving device 10 includes a stator 12 and a mover 14. The stator 12 includes a housing 16 and a frame 22. The housing 16 includes a shield case 18 provided on the front side and a bottom plate 20 provided on the rear side, and the bottom plate is fixed to the shield case 18. The housing 16 is a rectangular parallelepiped when viewed from the optical axis direction, and the inside of the housing 16 is hollow. Further, a rectangular frame 22 is disposed in the housing 16, and the frame 22 is fixed to the housing 16. Coils 24 are fixed to side portions corresponding to two opposing sides of the frame 22, respectively. The coil 24 includes a semicircular portion and a straight portion so as to extend in a direction orthogonal to the optical axis direction. A wiring board 26 is fixed to the frame 22 between the two coils 24. A position detection unit 28 is provided on the wiring board 26.

  The mover 14 is disposed in the housing 16. The mover 14 has a lens support 30 that supports the lens. The lens support 30 has a substantially quadrangular shape on the outer side when viewed from the optical axis direction. A lens fixing hole 32 for fixing the lens is formed inside the lens support 30.

  In addition, driving magnets 34 are fixed to the side outer walls corresponding to the two opposing sides of the lens support 30. The drive magnet 34 is formed in a rectangular shape extending in a direction orthogonal to the optical axis direction, and is divided into front and rear so as to have S and N poles in the front and rear. Further, a position detection magnet 36 is fixed to the surface between the two drive magnets 34 on the lens support 30.

  The mover 14 is elastically supported by a front leaf spring 38 and a rear leaf spring 40 formed in a square frame shape so as to be movable in the optical axis direction with respect to the stator 12.

  2 and 3, circular light passage holes 42 and 44 are respectively formed in the shield case 18 and the bottom plate 20 of the housing 16 so as to correspond to the lens fixing holes 32 of the lens support 30 described above. ing. Further, the wiring board 26 described above has a portion that protrudes rearward from the casing 26, and a power source and a control line for the position detection unit 28 are connected to the protruding portion. A current flows from the position detection unit 28 to the coil 24. A control signal from a controller (not shown) is sent to the wiring board 26.

  In FIG. 4, the front leaf spring 38 and the rear leaf spring 40 each have a rectangular frame portion 46. Stator side fixing portions 48 are formed at the four corners of the frame portion 46. The stator side fixing portion 48 has a triangular shape so as to protrude inward. An insertion hole 50 is formed in the stator side fixing portion 48.

  The arm portion 52 is inside the frame portion 46, and one end of the arm portion 52 is connected to the stator side fixing portion 48. The arm portion 52 has a bending portion 54 that is curved and extends in a diagonal direction, and a straight portion 56 that extends linearly from the bending portion 54 to the adjacent stator side fixing portion 48. The front end of the straight portion 56 extends to the vicinity of the adjacent stator fixing portion 48. A mover side fixing portion 58 is formed at the tip of the straight portion 48. The arm portion 52 connects the stator side fixing portion 48 and the mover side fixing portion 58.

  When the front leaf spring 38 and the rear leaf spring 40 are compared, the extending direction of the arm portion 52 starting from the stator side fixing portion 48 is different. In FIG. 4, the arm portion 52 of the front leaf spring 38 extends in the counterclockwise direction, and the arm portion 52 of the rear leaf spring 40 extends in the clockwise direction. For example, the front leaf spring 38 and the rear leaf spring 40 may be used in exactly the same shape, and may be assembled to the apparatus with the front and back reversed. The reason why the extending directions of the arm portions 52 are different will be described later.

  As shown in FIG. 4, the front leaf spring 38 and the rear leaf spring 40 described above are formed in a flat plate shape so as to belong to one plane in the free form, but are assembled as the lens driving device 10. In the state, the arm portion 38 is fixed so as to be elastically deformed so that the mover side fixing portion 58 is disposed on the inner side in the optical axis direction than the stator side fixing portion 48.

  5 to 8, the frame 22 has stator side fixed surfaces 60 at the four corners corresponding to the stator fixing portion 48. The stator-side fixed surface 60 is a triangular plane and has a protrusion (not shown) protruding in the optical axis direction. The stator side fixing portion 48 of the front side leaf spring 38 and the rear side leaf spring 40 is placed on the stator side fixed surface 60, the insertion hole 50 is inserted into the protrusion on the fixed surface 60, and the adhesive 61 is further interposed. The stator side fixed surface 60 is fixed.

  On the other hand, the mover-side fixing portion 58 is fixed to a mover-side fixed surface 62 that is an end surface in the optical axis direction of the lens support 30. In this embodiment, the mover side fixed surface 62 is fitted and fixed to a fixing protrusion 64 protruding in the optical axis direction.

  Here, as shown in FIG. 7, the distance L1 is the distance so that the distance L2 between the front and rear mover side fixed surfaces 62 is included in the distance L1 between the front and rear stator side fixed surfaces 60. It is larger than L2. For this reason, the front leaf spring 38 is extended rearward by the mover 14, and the rear leaf spring 40 is extended frontward.

  For example, when the lens support 30 is moved to the front side, the arm portion 52 of the front leaf spring 38 is extended in a substantially circumferential direction orthogonal to the optical axis direction, and the lens support 30 is rotated counterclockwise in FIG. On the other hand, the arm portion 52 of the rear leaf spring 40 is contracted in a substantially circumferential direction orthogonal to the optical axis direction, and the lens support 30 is rotated clockwise in FIG. That is, for example, when viewed from the front side in the optical axis direction, the front side portion and the rear side portion of the lens support 30 try to rotate in the same counterclockwise direction. In this way, the rotation direction of the lens support 30 is matched by changing the extending directions of the arm portions 52 of the front leaf spring 38 and the rear leaf spring 40, and the posture of the lens support 30 in the direction orthogonal to the optical axis direction. Can be stabilized.

As shown in FIG. 9, in the vicinity of one of the four corners, which is a part of the outer peripheral surface of the lens support 30, protrudes toward the inner peripheral surface of the frame 22 so as to be orthogonal to the optical axis direction. A protrusion 66 is provided. Further, a concave portion 68 is formed on the inner peripheral surface of the frame 22 so as to face the protruding portion 66. The protrusion 66 of the lens support 30 is accommodated so as to fit into the recess 68 of the frame 22. If the frame 22 and the lens support 30 have the same shape in the circumferential direction, there is a risk that the circumferential assembly position will be wrong. In this way, the protrusion 66 and the recess 68 are formed at one of the four corners. In this case, it is possible to prevent the circumferential mounting position from being mistaken. Further, the lens support 30 can be prevented from rotating with respect to the frame 22 by being fitted in the circumferential direction.
In this embodiment, the projection 66 is formed on the lens support and the recess 68 is formed on the frame 22. However, as another embodiment, the recess 68 is formed on the lens support and the projection 66 is formed on the frame 22. You may make it form.

  In FIG. 10, the position detector 28 provided on the wiring board 26 described above has, for example, a Hall element, and is inserted into a position detector insertion hole 70 formed in the frame 22. Further, the position detection magnet 36 described above is inserted and fixed in a position detection magnet insertion groove 72 formed in the lens support 30. When the position detection unit 28 faces the position detection magnet 36 and the position detection magnet moves together with the lens support 30 in the optical axis direction, the position detection unit 28 detects the position of the lens support 30 in the optical axis direction. Is done.

  In FIG. 11, the drive magnet 34 described above is inserted and fixed in a drive magnet insertion groove 74 formed in the lens support 30. The driving magnet insertion groove 74 has a planar magnet placement portion 76 formed at the center of the driving magnet insertion groove 74. The drive magnet 34 is in contact with the magnet placement portion 76 and is fixed in contact with the rear side surface of the drive magnet insertion groove 74. In the driving magnet insertion groove 74, the concave portions 78 are formed on both sides of the magnet placement portion 76, that is, the driving magnet 34 is not in contact with each other. The recess portion 78 is configured such that the groove gradually becomes deeper as it moves away from the magnet placement portion 76. For this reason, the lens support 30 is reduced in weight, and the thickness of the lens support 30 can be made uniform.

In the above configuration, the lens is supported on the lens support 30 described above. The lens driving device 10 in which the lens is supported on the lens support 30 is mounted on the camera device. In the camera device, light input from the subject via the lens is detected by a light receiving sensor. A movement amount of the lens for focusing the subject is calculated by a controller provided in the camera. This controller sends a control signal corresponding to the amount of lens movement to the wiring board 26. When a current flows through the coil 24 and a current flows through the coil 24, a magnetic flux is generated between the driving magnet 34 and the coil 24. When a magnetic flux is generated between the driving magnet 34 and the coil 24, an electromagnetic force is generated in the lens support 30 and the lens support 30 moves against the front leaf spring 38 or the rear leaf spring 40. In the wiring board 26, the position of the position detection magnet 36 is detected by the position detection unit 28, and feedback control is performed so that the lens support 30 stops at the target position.
In this way, when the lens support 30 is stopped, the lens support 30 is vibrated. Therefore, it is necessary to suppress the vibration of the lens support 30.

  Returning to FIG. 5, a resin 80 having viscoelasticity is bridged between the lens support 30 and the front leaf spring 38 and between the lens support 30 and the rear leaf spring 40. Thereby, the vibration of the mover 14, the front leaf spring 38, and the rear leaf spring 40 including the lens support 30 can be suppressed. The viscoelastic resin 80 is a silicone resin or the like, and is provided by application. In this embodiment, the arm portions 52 of the front leaf spring 38 and the rear leaf spring 40 face the mover-side fixed surface 62 of the lens support 30 and overlap when viewed from the optical axis direction. The resin 80 is interposed between the mover-side fixed surface 62 whose normal direction is the optical axis direction and the surface of the straight portion 56 of the arm portion 52 facing the mover-side fixed surface 62. The viscoelastic resin 80 is provided at a total of 8 locations, 4 locations on the front side and 4 locations on the rear side.

  As shown in FIGS. 5 and 6, the viscoelastic resin 80 is provided at a position closer to the mover side fixing portion 58 than to the stator side fixing portion 48. The vibration can be suppressed more stably by providing it at a position near the mover side fixing part 58 than at a position near the stator side fixing part 48.

Further, as shown in FIG. 12A, a concave groove 82 is formed in the mover side fixed surface 62 of the lens support 30, and a part of the viscoelastic resin 80 is accommodated in the concave groove 82. By accommodating a part of the viscoelastic resin 80 in the concave groove 82, the position of the viscoelastic resin 80 is not displaced even when the lens driving device 10 receives an impact.
12B, a concave groove 82 is formed in the mover side fixed surface 62 of the lens support 30, and the viscoelastic resin 80 is provided on the stator side fixing portion 48 side adjacent to the concave groove 82. As shown in FIG. Is provided. Since the viscoelastic resin 80 is difficult to move in the direction where the gap between the arm portion 52 and the mover side fixed surface 62 is wide, the position of the viscoelastic resin 80 is not easily displaced even when the lens driving device 10 is impacted. Although the groove shape is changed between FIG. 12A and FIG. 12B, either may be used. Also, other shapes such as a V groove may be used.

  Further, as a second embodiment, as shown in FIG. 13, the protrusion is located at a position facing the lens fixing hole 32 of the lens support 30 and between the lens fixing hole 32 and the viscoelastic resin 80. 84 may be formed so as to protrude in the optical axis direction. The protrusion 84 can prevent the viscoelastic resin 80 from moving to the lens fixing hole 32.

  Further, as a third embodiment, as shown in FIG. 14, the viscoelastic resin 80 bridges between the lens support 30 and the front leaf spring 38 or the rear leaf spring 40 in a direction orthogonal to the optical axis direction. You may make it do. That is, for example, in the initial state, when the stator side fixing portion 48 of the front side leaf spring 38 is on the rear side of the mover side fixing portion 58, the viscoelasticity is provided between the arm portion 52 and the side surface of the lens support 30. A resin 80 may be provided. Also in this case, it is preferable that a concave groove 82 is formed on the side surface of the lens support 30 and a part of the viscoelastic resin 80 is accommodated in the concave groove 82 as in the above-described embodiment. When the rear leaf spring 40 is in the same state, a viscoelastic resin 80 may be provided between the rear leaf spring 40 and the lens support 30.

  In this specification, the lens driving device used in the camera device has been described, but the present invention can also be applied to other devices.

DESCRIPTION OF SYMBOLS 10 Lens drive device 12 Stator 14 Mover 16 Case 18 Shield case 20 Bottom plate 22 Frame 24 Coil 26 Wiring board 28 Position detection part 30 Lens support body 32 Lens fixing hole 34 Driving magnet 36 Position detection magnet 38 Front leaf spring 40 Rear leaf spring 46 Frame portion 48 Stator side fixing portion 52 Arm portion 54 Bending portion 56 Linear portion 58 Mover side fixing portion 60 Stator side fixing surface 62 Mover side fixing surface 66 Protrusion portion 68 Recess 76 Magnet mounting portion 78 Dimple Part 80 Resin 82 Groove

Claims (17)

A stator,
A mover including a lens support for holding the lens and moving in the optical axis direction of the lens with respect to the stator;
A stator side fixing portion fixed to the stator, a mover side fixing portion fixed to the mover, and an arm portion connecting the stator side fixing portion and the mover side fixing portion. A leaf spring that is movably supported with respect to the stator;
And a resin having viscoelasticity that bridges the arm and the mover.   2. The lens driving device according to claim 1, wherein the resin bridges a surface of the mover whose normal direction is the optical axis direction and a surface of the arm portion facing the surface of the mover. The leaf spring has a front leaf spring that supports the mover on the front side of the mover and a rear leaf spring that supports the mover on the rear side of the mover,
The resin is opposed to the surface of the mover facing the front side, the surface of the front leaf spring facing the surface of the mover facing the rear side, and the surface of the mover facing the rear side and the surface of the mover The lens driving device according to claim 1, wherein the surfaces of the rear leaf springs facing the front side are bridged.   2. The lens driving device according to claim 1, wherein the resin bridges a surface of the mover having a normal direction in a direction orthogonal to the optical axis and a surface of the arm portion facing the surface of the mover.   The lens driving device according to any one of claims 2 to 3, wherein a concave groove that accommodates the resin is provided on a surface of the mover.   4. The lens driving device according to claim 2, wherein a concave groove is provided on the surface of the mover, and the resin is provided on the stator side fixing portion side adjacent to the concave groove. 5.   The arm portion includes a bending portion connected to the stator side fixing portion, and a linear portion extending from the bending portion to the mover side fixing portion, and the resin is formed on the arm portion at the linear portion of the arm portion. The lens driving device according to any one of claims 1 to 6, wherein a bridge is connected to the mover.   The lens driving device according to any one of claims 1 to 7, wherein the resin is provided at a position closer to the mover side fixing portion than the stator side fixing portion.   A lens fixing hole for fixing a lens is provided at the center of the mover, and a protrusion protruding in the optical axis direction is provided between the surface of the mover and the lens fixing hole. The lens driving device according to claim 2.   The distance in the optical axis direction between the stator side fixing portion of the front leaf spring and the stator side fixing portion of the rear leaf spring is the distance between the mover side fixing portion of the front leaf spring and the rear leaf spring. The lens driving device according to claim 3, wherein the lens driving device is larger than a distance in the optical axis direction from the mover-side fixing portion. A lens support for holding the lens;
A housing for housing the lens support;
A front leaf spring and a rear leaf spring that support the lens support with respect to the housing;
The front leaf spring is connected to the front side surface of the housing and the front side surface of the lens support body facing the front side in the optical axis direction of the lens,
The rear leaf spring is a lens driving device connected to the rear side surface of the housing and the rear side surface of the lens support body facing the rear side in the optical axis direction of the lens.   12. The lens according to claim 11, wherein the housing has a quadrangular shape when viewed from the optical axis direction, and a front side surface and a rear side surface of the housing are respectively formed to protrude inward from corners of the square shape. Drive device. A lens support for holding the lens;
A housing for housing the lens support;
A leaf spring that supports the lens support with respect to the housing;
Either the outer peripheral surface of the lens support or the inner peripheral surface of the housing has a protruding portion that protrudes from a part of the circumferential direction toward the other,
The other is a lens driving device having a concave portion for accommodating the protruding portion. A lens support having a lens fixing hole in the center for fixing the lens;
A housing for housing the lens support;
A magnet fixed to the lens support;
A coil that is fixed to the housing so as to face the magnet,
The lens support is square when viewed from the optical axis direction of the lens, and a magnet fixing part for fixing the magnet is provided on a side corresponding to the side of the square.
The lens driving device includes a magnet mounting portion on which the magnet fixing portion is formed in a planar shape so as to bend over the side portion and mounts the magnet.   The lens driving device according to claim 14, further comprising a hollow portion that further includes at least one of circumferential end portions of the magnet placement portion.   A camera device comprising: the lens driving device according to any one of claims 1 to 15; a lens held by the lens support; and a light receiving sensor that detects light transmitted through the lens.   An electronic apparatus comprising: the lens driving device according to claim 1; a lens held by the lens support; and a light receiving sensor that detects light transmitted through the lens.

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