JP6353721B2 - Lens drive device - Google Patents

Description

  The present invention relates to a lens driving device.

  2. Description of the Related Art A lens driving device including an electromagnetic driving type driving unit including a coil and a magnet is known. Such a lens drive device includes a drive device for autofocus that drives the lens frame along the optical axis direction and a drive device for camera shake correction that drives the lens frame in a direction that intersects the optical axis direction. The camera described in Patent Document 1 below includes both an autofocus drive device and a camera shake correction drive device.

  In such a lens driving device, the lens frame is attached to the support member via an elastic support member such as a leaf spring, and the position of the lens frame is obtained when the thrust generated by the drive unit and the elastic force of the elastic support member are balanced. To control. The prior art described in the following Patent Document 1 moves the entire autofocus lens driving device in a first direction (X direction) and a second direction (Y direction) that are orthogonal to the optical axis and orthogonal to each other. Is a camera shake correction device configured to perform camera shake correction, and a base that is spaced apart from the bottom surface portion of the autofocus lens driving device and one end fixed at the outer peripheral portion of the base, and the optical axis And a plurality of suspension wires that support the entire autofocus lens driving device so as to be swingable in a first direction (X direction) and a second direction (Y direction).

  In this prior art, the lens frame around which the focus coil is wound is supported by a magnet holder that is arranged around the lens frame via a leaf spring for autofocus, and supports the front end of the lens frame. The front end of the suspension wire is fixed to the outer periphery of the leaf spring. Accordingly, in the autofocus lens driving device, the magnet holder that elastically supports the lens frame via the leaf spring is supported in a suspended state at the front ends of the plurality of suspension wires extending in the optical axis direction.

JP 2011-65140 A

  In the conventional lens driving device, since the lens frame is supported via an elastic support member such as a leaf spring, when the lens frame receives a force in a direction intersecting the optical axis, vibration is generated in the lens frame. The lens frame cannot be stably moved in the optical axis direction. Further, in the case of performing camera shake correction as described above, since the drive for camera shake correction becomes a vibration source of the vibration of the lens frame, it becomes more difficult to stably move the lens frame along the optical axis direction. In particular, the drive unit has been downsized due to the demand for downsizing and weight reduction of the lens driving device, and the thrust is reduced. To cope with this, it is necessary to weaken the force of the leaf spring. Depending on the circumstances, the lens frame is likely to vibrate.

  This invention makes it an example of a subject to cope with such a problem. That is, it is possible to stably move the lens frame in the optical axis direction by suppressing the vibration of the lens frame, to effectively suppress the vibration of the lens frame without affecting the force of the leaf spring, etc. Is the purpose.

In order to achieve such an object, a lens driving device according to the present invention has the following configuration.
A lens frame; a support portion that elastically supports the lens frame with respect to a drive direction; and a drive portion that drives the lens frame in one or both of an optical axis direction and a direction intersecting the optical axis. Includes a support member that surrounds the lens frame around the optical axis, and a protrusion is provided on one side and a recess is provided on the other on the outer surface of the lens frame and the inner surface of the support member, and contacts the recess. By disposing the protruding portion without providing an adhesive member accommodating portion for accumulating an adhesive member between the concave portion and the protruding portion, the support member drives the lens frame in a direction intersecting the optical axis. A lens driving device characterized by being a movable support member .

It is a disassembled perspective view of the lens drive device concerning the embodiment of the present invention. It is explanatory drawing ((a) is a top view, (b) is XX sectional drawing of (a)) which showed the whole structure which concerns on embodiment of this invention. An explanatory view showing a movable support member and a leaf spring in a lens driving device according to an embodiment of the present invention ((a) is a plane showing a state where the front leaf springs 11 and 12 are mounted on the lens frame 2 and the movable support member 10). (B) is a plan view of the lens frame 2 and the movable support member 10 with the front leaf springs 11 and 12 removed. It is a side view of the movable support member and leaf | plate spring (front side leaf | plate springs 11 and 12) arrange | positioned around the lens frame in the lens drive device which concerns on embodiment of this invention. It is explanatory drawing ((a) is a top view, (b), (c) is XX sectional drawing of (a)) which showed the protrusion part and recessed part which form an adhesive member reservoir in detail. BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing ((a) is a camera, (b) is a portable information terminal) which showed the electronic device provided with the lens drive device which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an exploded perspective view of a lens driving device according to an embodiment of the present invention, and FIG. 2 shows an overall configuration according to the embodiment of the present invention ((a) is a plan view, (b) ) Is an XX sectional view of (a).

  The lens driving device 1 includes a lens frame 2, a support unit 3, and a driving unit 4. The lens frame 2 includes a lens barrel attachment port 2S for attaching a lens barrel (not shown). The central axis of the lens barrel mounting port 2S is the optical axis of the lens. Hereinafter, the object side of the lens will be described as “front”, and the image side of the lens will be described as “rear”. In the figure, the optical axis direction is indicated by the Z direction, and the directions intersecting the optical axis are indicated by the X and Y directions.

  The drive unit 4 drives the lens frame 2 in one or both of the optical axis direction and the direction intersecting the optical axis. The illustrated example shows an example in which an autofocus drive unit that drives in the optical axis direction and a camera shake correction drive unit that drives in the direction crossing the optical axis are provided. Only a drive part may be sufficient. In the illustrated example, the drive unit 4 includes a focus coil 20 wound around the optical axis on the outer surface of the lens frame 2, four magnets 21 disposed around the lens frame 2, and four magnets 21. A camera shake correction coil 22 (22A, 22B) is provided behind each of the two magnetic field directions orthogonal to each other.

  The support unit 3 elastically supports the lens frame 2 in the driving direction of the driving unit 4. The position of the lens frame 2 is controlled by a balance between the thrust of the drive unit 4 and the elastic force of the support unit 3. The illustrated example shows an example in which the lens frame 2 is elastically supported along the optical axis direction and the direction intersecting the optical axis. However, the present invention is not limited thereto, and the lens frame 2 is elastic only in the optical axis direction. It may be one that supports.

  In the illustrated example, the support unit 3 includes a movable support member 10, front plate springs (plate springs) 11 and 12, a rear plate spring (plate spring) 13, a support wire 14, and a base support member 15. The movable support member 10 surrounds the lens frame 2 around the optical axis, elastically supports the lens frame 2 in the optical axis direction, and is elastically supported in a direction intersecting the optical axis. The illustrated movable support member 10 has a rectangular shape having a corner around the optical axis, and the corner serves as a magnet holding portion 10P that holds the magnet 21 described above.

  Outer attachment portions 11A and 11B of the front leaf spring 11 are attached to the front end attachment portions 10A and 10B of the movable support member 10, and an inner attachment portion 11C of the front leaf spring 11 is provided on the front surface 2A of the lens frame 2. It is attached to the part 2A1. The front end attaching portions 10C and 10D of the movable support member 10 are attached with outer attaching portions 12B and 12A of the front leaf spring 12, and the inner attaching portion 12C of the front leaf spring 12 is provided on the front surface 2A of the lens frame 2. It is attached to the part 2A2.

  The front leaf spring 11 includes elastic portions 11D and 11E between the outer attachment portions 11A and 11B and the inner attachment portion 11C. Similarly, the front leaf spring 12 includes the outer attachment portions 12A and 12B and the inner attachment portion. The elastic parts 12E and 12D are provided between 12C.

  An outer attachment portion 13A of the rear leaf spring 13 is attached to the rear end attachment portion 10E of the movable support member 10, and an inner attachment portion 13B of the rear leaf spring 13 is attached to the rear attachment portion 2C provided on the rear surface of the lens frame 2. It is attached. The rear leaf spring 13 includes an elastic portion 13C between the outer attachment portion 13A and the inner attachment portion 13B.

Comprising the front of the lens frame 2, the elastic portion 11D, 11E, 12D, 12E are supported on the front side of the movable support member 10 via a front plate springs 11, 12 provided with the side of the lens frame 2 is an elastic portion 13C It is supported on the rear side of the movable support member 10 via the rear leaf spring 13. Thus, the lens frame 2 is elastically supported by the movable support member 10 for driving in the optical axis direction.

  The base support member 15 is disposed on the rear side of the lens frame 2 and the movable support member 10, and includes a central opening 15 </ b> A that allows light that has passed through the lens to pass through the bottom plate 15 </ b> B. In the illustrated example, the base support member 15 has a rectangular shape with corners around the optical axis, like the movable support member 10, and includes wire holding portions 15C at the corners.

  The support wire 14 (14A, 14B, 14C, 14D) has elasticity with respect to the curvature, and the rear end is held by the wire holding portion 15C of the base support member 15 and is erected along the optical axis. Yes. The front ends of the support wires 14A, 14B, 14C, 14D are attached to the outer attachment portions 11A, 12A, 11B, 12B of the front leaf springs 11, 12 attached to the movable support member 10, and the support wire 14 Supports the movable support member 10 that elastically supports the lens frame 2 in a suspended manner. As a result, the lens frame 2 is elastically supported by the elastic curvature of the support wire 14 with respect to driving in a direction intersecting the optical axis.

  The base support member 15 includes an external connection terminal 15 </ b> F, and includes a circuit connected to the external connection terminal 15 </ b> F on the bottom plate 15 </ b> B, thereby configuring a power feeding end to the drive unit 4. Part of the external connection terminal 15F having a plurality of independent terminals is provided at both ends of the camera shake correction coil 22 (22A, 22B) supported by the coil support portion 15D of the base support member 15 via a circuit provided in the bottom plate 15B. It is connected and serves as a power supply terminal of the camera shake correction coil 22.

  A part of the external connection terminal 15F is connected to both ends of the focus coil 20 from the circuit provided in the bottom plate 15B via the support wires 14A and 14B held by the wire holding portion 15C and the front leaf springs 11 and 12. The focus coil 20 is a power supply terminal.

  Further, a part of the external connection terminal 15F is connected to the position detection sensor 6 (6A, 6B) supported by the sensor support portion 15E of the base support member 15 via a circuit provided in the bottom plate 15B. It is an input / output terminal of the sensor 6 (6A, 6B).

  By controlling power feeding to the focus coil 20 and the camera shake correction coil 22 independently, focus control and camera shake correction control of the lens frame 2 can be performed. At that time, the camera shake correction control is feedback control based on the detection signal of the position detection sensor 6 (6A, 6B). A filter frame F is mounted behind the base support member 15, and an imaging element (not shown) is mounted behind the filter frame F. A protective frame 5 having a central opening 5 </ b> A is attached to the base support member 15 so as to surround the outer periphery of the movable support member 10.

  3 and 4 show the movable support member 10 and the leaf springs (front leaf springs 11 and 12) arranged around the lens frame 2. 3A is a plan view showing a state in which the front leaf springs 11 and 12 are attached to the lens frame 2 and the movable support member 10, and FIG. 3B is a state in which the front leaf springs 11 and 12 are removed. 2 is a plan view of a lens frame 2 and a movable support member 10. FIG. FIG. 4 is a side view of the movable support member 10 and leaf springs (front leaf springs 11 and 12) disposed around the lens frame 2.

  The outer attachment portions 11A, 11B, 12A, and 12B of the front leaf springs 11 and 12 include a corner portion 40 that is fixed to the tip of the support wire 14, a fixing portion 41 that is fixed to the front end of the movable support member 10, and a fixing portion. A pair of arm portions 42 that elastically connect 41 and the corner portion 40 and a connection portion 43 that connects between the pair of arm portions 42 are provided. The corner portion 40 is disposed at a position corresponding to the corner portion 10H of the movable support member 10, and is positioned at the apex of the substantially triangular outer mounting portions 11A, 11B, 12A, and 12B. The fixed portion 41 is located at the center of the substantially triangular outer mounting portions 11A, 11B, 12A, and 12B, and is fixed to the mounting surface 10J of the front end mounting portions 10A, 10B, 10C, and 10D of the movable support member 10. ing.

  The pair of arm portions 42 are located on the outer peripheral portions of the substantially triangular outer mounting portions 11A, 11B, 12A, and 12B, and the corner portions 40 are located with respect to the fixed portion 41 that is fixed to the front end of the movable support member 10. The fixed portion 41 and the corner portion 40 are elastically connected so that the position can be displaced up and down. The connecting portion 43 connects the pair of arm portions 42 in an arch shape, and an opening is formed between the connecting portion 43 and the corner portion 40.

  On the other hand, the front end attaching portions 10A, 10B, 10C, and 10D of the movable support member 10 to which the outer attaching portions 11A, 11B, 12A, and 12B of the front leaf springs 11 and 12 are attached have a concave corner portion 10H in a plan view. The inside is a space for arranging the support wire 14, and the corner portions 40 of the front leaf springs 11 and 12 are arranged thereon and fixed to the tip of the support wire 14. A pair of anti-rotation convex portions 10G is provided for each corner portion 10H so as to protrude outside the pair of arm portions 42 of the front side leaf springs 11 and 12 at a position close to the corner portion 10H. The arm portions 42 of the front leaf springs 11 and 12 are protected.

  The front end attaching portions 10A, 10B, 10C, and 10D of the movable support member 10 are stepped portions that are positioned below the pair of arm portions 42 in the front leaf springs 11 and 12 and have a gap with the arm portions 42. 10K and an adhesive member reservoir 10L which is located below the connecting portion 43 in the front leaf springs 11 and 12 and is recessed along the connecting portion 43 are provided.

The step portion 10K in the movable support member 10 is formed one step down from the mounting surface 10J to which the fixing portion 41 of the front plate springs 11 and 12 is fixed, and only allows the bending of the arm portion 42 in the front plate springs 11 and 12. It has a dent. Further, the adhesive member reservoir 10L wall having a deeper recess has, the adhesive member reservoir outside the height of the mounting surface 10J and flush the 10L than recessed step portion 10K down from the mounting surface 10J Part 10N is provided. The wall portion 10N is located in the opening between the corner portion 40 and the connecting portion 43 of the front leaf springs 11 and 12. An adhesive member for damping vibration is stored in the adhesive member reservoir 10L, and the adhesive member is stored in contact with the connecting portion 43 of the front leaf springs 11 and 12 located on the adhesive member reservoir 10L.

  The adhesive member reservoir 10L has an inner wall at the level difference from the mounting surface 10J and an outer wall at the level difference from the wall 10N. Further, the adhesive member reservoir 10L has left and right walls that are stepped from the stepped portion 10K. Thus, since the adhesive member reservoir 10L is a recess having a wall around it, the vibration damping adhesive member having a relatively high viscosity stored in the reservoir 10L does not flow out to the outside. It is possible to maintain the state of being stored in the pool.

The lens frame 2 arranged inside the movable support member 10 is provided with stopper projections 2B and vibration damping projections 30 on the four sides of the outer surface. The movable support member 10 has a stopper projection 2B on the stopper projection 2B. Correspondingly, a stopper receiver 10M is provided, and a recess 31 is provided on the inner side surface corresponding to the protrusion 30. The stopper receiver 10 </ b> M provided on the movable support member 10 restricts excessive movement of the lens frame 2 in the movable support member 10 by hitting a stopper projection 2 </ b> B provided on the lens frame 2. The movable range in the optical axis direction of the lens frame 2 is regulated by the stopper surface 2B2 of the stopper projection 2B coming into contact with the bottom surface 10M1 of the stopper receiver 10M. The movable range in the direction intersecting the optical axis of the lens frame 2 is the stopper. It is regulated by the stopper surface 2B1 of the stopper projection 2B hitting the side surface of the receptacle 10M.

Between the concave portion 31 provided in the movable support member 10 and the protruding portion 30 protruding therein, there is provided an adhesive member accommodating portion 32 that accommodates a vibration damping adhesive member, and this adhesive member provides a lens frame. 2 unnecessary vibration is suppressed. Here, the concave portion 31 is provided on the inner side surface of the movable support member 10 and the projecting portion 30 is provided on the outer side surface of the lens frame 2, but conversely, the concave portion 31 is provided on the inner side surface of the lens frame 2 and movable support is provided. A protrusion 30 may be provided on the outer surface of the member 10.

FIG. 5 is an explanatory view showing in detail the protrusions and the recesses forming the adhesive member accommodating portion 32 ((a) is a plan view, and (b), (c) are XX cross-sectional views of (a)). It is. The concave portion 31 has a wide width with respect to the protruding portion 30, and the gaps S <b> 1 and S <b> 2 with the protruding portion 30 in the concave portion 31 in the direction intersecting the optical axis of the lens frame 2 in the direction intersecting the optical axis. It is set larger than the movable range. Further, the gap S3 between the bottom surface 33 of the recess 31 and the bottom surface of the protrusion 30 in the optical axis direction is also set to be larger than the movable range of the lens frame 2 in the optical axis direction. The protrusion part 30 has the bottom face 33 which does not bottom with respect to the movable range along a direction. As a result, the protruding portion 30 is disposed without always contacting the concave portion 31. Here, the movable range of the lens frame 2 with respect to the movable support member 10 is regulated by the stopper protrusion 2B and the stopper receiver 10M described above.

  And between the center outer surface of the protrusion part 30 and the center inner surface of the recessed part 31, the adhesive member accommodating part 32 which stores the adhesive member G along an optical axis direction is provided. A tip recess 30 </ b> A is formed at the center tip of the protrusion 30, and the adhesive member accommodating portion 32 is between the tip recess 30 </ b> A and the inner surface of the recess 31. The focus coil 20 is wound around the optical axis on the outer surface of the lens frame 2, but the protruding portion 30 is formed to protrude from a flange portion 34 that protrudes outside the winding range of the focus coil 20.

Thus, the lens frame 2 arranged in the movable support member 10 can move along the optical axis direction without directly contacting the movable support member 10, and thereby the optical axis of the lens frame 2. The driving force along the direction is reduced. In addition, an adhesive member accommodating portion 32 that stores an adhesive member G for vibration damping is formed between the projecting portion 30 and the concave portion 31 between the movable support member 10 and the lens frame 2. Even if vibration occurs in the frame 2, this vibration can be quickly attenuated, and the lens frame 2 can be operated stably without shaking.

  Since the movable range of the projecting portion 30 disposed in the recess 31 is restricted so that the projecting portion 30 does not contact the inner surface of the recess 31 at all times, the adhesive property disposed between the projecting portion 30 and the recessed portion 31. The member G does not flow out of the recess 31 due to impact or vibration.

  Further, in the autofocus operation of the lens frame 2 within the movable support member 10, as shown in FIG. 5C, even when the lens frame 2 moves most toward the base support member 15 with respect to the movable support member 10. Since the clearance S3 between the bottom surface 33 of the recessed portion 31 and the bottom surface of the protruding portion 30 is secured, the adhesive member G in the recessed portion 31 does not flow out by the autofocus operation of the lens frame 2. Further, since the clearance S3 is always secured, no hysteresis is generated at the time of re-starting even when the lens frame 2 moves to the end as shown in FIG.

  Since the protruding portion 30 provided on the lens frame 2 protrudes from the flange portion 34 protruding outside the winding range of the focus coil 20, the adhesive member G flows and expands along the winding direction of the focus coil 20. Such a problem does not occur.

  As described above, the lens driving device 1 according to the embodiment of the present invention can stably move the lens frame 2 in the optical axis direction by suppressing the vibration of the lens frame 2, and elastically support the lens frame 2. The vibration of the lens frame 2 can be effectively suppressed without affecting the amount of force of the leaf spring.

  FIG. 6 shows an electronic apparatus including the lens driving device 1 according to the embodiment of the present invention. The lens driving device 1 according to the embodiment of the present invention can be reduced in size and can have high autofocus performance or camera shake correction performance by being mounted on the camera 100 shown in FIG. . Moreover, by mounting on the portable information terminal (including a mobile phone, a smart phone, etc.) 200 shown in FIG. 5B, the entire device can be made thinner, the camera function part can be enhanced, and the space can be saved. .

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and the design can be changed without departing from the scope of the present invention. Is included in the present invention. In addition, the above-described embodiments can be combined by utilizing each other's technology as long as there is no particular contradiction or problem in the purpose and configuration. In addition, the adhesive member in embodiment mentioned above should just be a member which has a damping property, such as ultraviolet curable resin, thermosetting resin, and grease.

1: lens driving device, 2: lens frame, 2A: front surface,
2B: Stopper protrusion, 2B1, 2B2: Stopper surface,
2A1, 2A2: front mounting part, 2S: lens barrel mounting port,
2C: Rear mounting part,
3: support part, 4: drive part, 5: protective frame, 5A: central opening,
6 (6A, 6B): position detection sensor,
10: movable support member, 10A, 10B, 10C, 10D: front end mounting portion,
10E: Rear end mounting portion, 10P: Magnet holding portion,
10F: outer peripheral surface, 10G: rotation stopper convex portion, 10H: corner portion,
10J: mounting surface, 10K: stepped portion, 10L: adhesive member reservoir,
10M: Stopper receiver
11, 12: Front leaf spring (leaf spring),
11A, 11B, 12A, 12B: outside attachment part,
11C, 12C: inner mounting part,
11D, 11E, 12D, 12E: elastic part,
13: Rear leaf spring (leaf spring),
13A: outside attachment part, 13B: inside attachment part,
13C: Elastic part, 14 (14A, 14B, 14C, 14D): Support wire,
15: Base support member, 15A: Center opening, 15B: Bottom plate,
15C: wire holding part, 15D: coil support part, 15E: sensor support part,
15F: External connection terminal,
20: Focus coil, 21: Magnet,
22 (22A, 22B): camera shake correction coil,
30: protrusion, 30A: tip recess, 31: recess, S1, S2, S3: gap,
32: Adhesive member housing part , 33: Bottom surface, 34: Flange part,
40: Corner part, 41: Fixed part, 42: Arm part, 43: Connection part,
F: filter frame, 100: camera, 200: portable information terminal, G: adhesive member

Claims (6)

A lens frame,
A support portion for elastically supporting the lens frame in the driving direction;
A driving unit that drives the lens frame in one or both of an optical axis direction and a direction intersecting the optical axis;
The support portion includes a support member that surrounds the lens frame around an optical axis,
By providing a protrusion on one side and a recess on the other on the outer surface of the lens frame and the inner surface of the support member, the protrusion and the protrusion are arranged without contacting the recess. An adhesive member accommodating portion for storing the adhesive member is provided between
The lens driving device , wherein the supporting member is a movable supporting member for driving the lens frame in a direction intersecting the optical axis . Wherein the outer surface of the lens frame is wound a coil around the optical axis, wherein the protrusions of claim 1, wherein the protruding flange portion which projects outside the winding range of the coil Lens drive device. Between the central inner surface of the recess and the central outer surface of the projection, according to claim 1 or 2, wherein the adhesive member accommodating portion for storing the adhesive member along the optical axis direction is provided The lens driving device according to claim 1. The recess, the lens driving device according to any one of claims 1-3, characterized in that it has a bottom surface that the protrusion is not bottoming against the movable range along the optical axis direction of the lens frame. The camera provided with the lens drive device described in any one of Claims 1-4 . The electronic device provided with the lens drive device described in any one of Claims 1-4 .

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