JP6433772B2 - 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 lens driving devices include a driving device for autofocus that drives the lens frame along the optical axis direction, and a driving device for camera shake correction that drives the lens frame in a direction crossing the optical axis. The camera described in Patent Document 1 includes an autofocus driving device and a camera shake correction driving 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 Patent Document 1 described below is a camera shake correction in which the entire autofocus lens driving device is moved in the X and Y directions orthogonal to the optical axis and orthogonal to each other. A correction device, a base that is spaced apart from the bottom of the autofocus lens driving device, and one end fixed at the outer periphery of the base, extending along the optical axis, and driving the autofocus lens A plurality of suspension wires are provided to support the entire apparatus so as to be swingable in the X and Y directions.

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, the lens frame is applied to the lens frame by an external force such as vibration or drop impact generated when the lens frame is moved to a specific control position. There is a problem that it takes time to attenuate the generated vibration. In addition, in the case of performing the camera shake correction as described above, since the driving for the camera shake correction becomes a vibration source of the vibration of the lens frame moving in the optical axis direction, the lens frame is stably moved along the optical axis direction. Things become more difficult. In particular, the driving unit has been downsized due to demands 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 elastic support member. Due to various circumstances, the lens frame is prone to vibration.

  In contrast, vibration attenuation of the lens frame is accelerated by interposing a gel-like damper material in the gap between the lens frame and the support member. However, the lens driving device mounted in the electronic device is subjected to a cleaning process after assembly of the lens driving device so that dust and dirt attached to the lens driving device are not brought into the electronic device. This cleaning process causes the damper material to be blown off, making it impossible to effectively dampen vibrations. Therefore, there is a demand for a structure in which a gel-like damper material can be interposed in the gap between the lens frame and the support member even after the lens driving device is cleaned.

  This invention makes it an example of a subject to cope with such a problem. That is, it is possible to effectively attenuate the vibration of the lens frame without affecting the force of the elastic member, to stably control the position of the lens frame, and even after performing the cleaning process on the lens driving device. An object of the present invention is that a gel-like damper material can be interposed between the lens frame and the support member.

In order to achieve such an object, the present invention has the following configuration. Comprising a lens frame, a supporting portion for elastically supporting the lens frame with respect to the driving direction and a driving section for driving the lens frame at least in the optical axis Direction, the support portion is disposed outside the lens frame The lens frame is provided with a damper material holding portion that protrudes outward and extends along the optical axis direction of the lens frame. The damper frame includes the damper material holding portion. enclosing folder bumpers material container to form a gap tamper material around the damper member holding portion is deployed is provided in the damper material accommodating portion, the movement of the longitudinal optical axis of the damper material holding portion A lens drive comprising: a space extending to the optical axis so as to allow; and a space penetrating the support frame toward a side opposite to the lens frame in a direction orthogonal to the optical axis. apparatus.

  According to the lens driving device of the present invention having such features, the lens frame is effectively damped by interposing the damper material in the gap between the damper material holding portion and the damper material accommodating portion, and the lens frame. It is possible to stably perform the position control. In addition, since the damper material accommodating portion penetrates into and out of the support frame, a gel-like damper material is interposed between the lens frame and the support frame even after the lens driving device is cleaned. Can do.

It is a disassembled perspective view of the lens drive device concerning the embodiment of the present invention. 1 is an overall perspective view (with a cover removed) of a lens driving device according to an embodiment of the present invention. (A) is a top view of the lens drive device which concerns on embodiment of this invention, (b) is the front view. It is sectional drawing (AA sectional drawing of Fig.3 (a)) of the lens drive device which concerns on embodiment of this invention. It is explanatory drawing ((a) is a top perspective view, (b) is a back perspective view) which showed the lens frame of the lens drive device in embodiment of this invention. It is explanatory drawing ((a) is a front view, (b) is AA sectional drawing of (a)) which showed the support frame of the lens drive device which concerns on embodiment of this invention. It is explanatory drawing (sectional drawing) which showed the damper material holding | maintenance part and damper material accommodating part of the lens drive device which concern on embodiment of this invention. It is explanatory drawing which showed the electronic device ((a) is a camera and (b) is a portable information terminal) 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. 1 to 4 show the overall configuration of a lens driving device according to an embodiment of the present invention. 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 focus magnets 21 disposed around the lens frame 2, and a magnetic field direction of X−. Two camera shake correction magnets 23 (23A, 23B) orthogonal to the Y direction and camera shake correction coils 22 (22A, 22B) disposed behind them are provided.

  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 support frame (movable support frame) 10 disposed outside the lens frame 2. Further, the support unit 3 includes an axial elastic support member that elastically supports the lens frame 2 along the optical axis direction, a deflection elastic support member that elastically supports the lens frame 2 along the direction intersecting the optical axis, and a support frame. And a base support member 15 that supports 10 through a swing elastic support member.

  The axial elastic support members here are the front leaf springs 11 and 12 and the rear leaf spring 13, and the runout elastic support members are the support wires 14A to 14D. The support frame (movable support frame) 10 has a rectangular shape surrounding the lens frame 2 around the optical axis, and a corner portion thereof is a magnet holding portion 10P that holds the focus 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 support frame 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 2A1. Outer attachment portions 12B and 12A of the front leaf spring 12 are attached to the front end attachment portions 10C and 10D of the support frame 10, and an inner attachment portion 12C of the front leaf spring 12 is provided on the front surface 2A of the lens frame 2. It is attached to 2A1.

  The front leaf spring 11 includes an elastic portion 11D 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 12C. An elastic portion 12D is provided between the two.

  An outer attachment portion 13A of the rear leaf spring 13 is attached to the rear end attachment portion 10E of the support frame 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 done. The rear leaf spring 13 includes an elastic portion 13C between the outer attachment portion 13A and the inner attachment portion 13B.

  The front side of the lens frame 2 is supported on the front side of the support frame 10 via the front leaf springs 11 and 12 including the elastic portions 11D and 12D, and the rear leaf spring 13 including the elastic portion 13C is provided on the rear side of the lens frame 2. It is supported on the rear side of the support frame 10 via. Accordingly, the lens frame 2 is elastically supported by the support frame 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 support frame 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 support frame 10, and includes wire holding portions 15C at the corners.

  The support wires 14 </ b> A to 14 </ b> D have elasticity against bending, and the rear end thereof is held by the wire holding portion 15 </ b> C of the base support member 15 and is erected along the optical axis. The front ends of the support wires 14A to 14D are wire attachment portions 11A1, 12A1, 11B1, which project outward from the outer attachment portions 11A, 12A, 11B, 12B of the front leaf springs 11, 12 attached to the support frame 10. The support wires 14A to 14D are attached to 12B1 and support the support frame 10 that elastically supports the lens frame 2 in a suspended manner. Thereby, the lens frame 2 is elastically supported with respect to driving in a direction intersecting the optical axis by elastic bending of the support wires 14A to 14D.

  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.

  Further, the other 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 part 15C and the front leaf springs 11 and 12. The power supply terminal of the focus coil 20 is used.

  Further, another 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 for the position detection sensor 6 (6A, 6B). As the position detection sensor 6 (6A, 6B), a hall sensor (magnetic sensor) can be used, and a position detection magnet 7 (7A, 7B) is provided on the support frame 10 so as to face the position detection sensor 6. Is provided.

  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). For example, a filter frame (not shown) is mounted behind the base support member 15, and an image sensor is mounted behind the filter frame. A cover 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 support frame 10.

  FIG. 5 shows the lens frame 2 of the lens driving device 1. The lens frame 2 is formed with flange portions 2D and 2E projecting outward around the front surface 2A and the rear surface 2B, and a space between the flange portions 2D and 2E serves as a holding portion for the focus coil 20. On the outer edge of the flange portion 2D, three guide convex portions 2F protruding further outward are provided. Further, a damper material holding portion 30 that protrudes outward at an axially symmetric position is provided on the outer edge of the flange portion 2E. The damper material holding portion 30 includes a protruding portion 31 protruding outside the lens frame 2 and a rod-shaped portion 32 extending along the optical axis direction.

  FIG. 6 shows the support frame 10 of the lens driving device 1. The support frame 10 is a frame that surrounds the lens frame 2, and a guide recess 10 </ b> F that fits into the guide protrusion 2 </ b> F of the lens frame 2 is provided on the inner surface side thereof. In addition, a damper material accommodating portion 40 surrounding the damper material holding portion 30 of the lens frame 2 is provided. The damper material accommodating portion 40 surrounds the damper material holding portion 30, forms a gap around the damper material holding portion 30, and is formed so as to penetrate inside and outside the support frame 10. The damper material accommodating portion 40 includes a space (first space 41) penetrating in and out of the support frame 10 and a space (second space 42) allowing movement of the rod-shaped portion 32 of the damper material holding portion 30 in the optical axis direction. Have

  FIG. 7 shows an arrangement relationship between the damper material holding portion 30 and the damper material accommodation portion 40. Since the first space 41 of the damper material accommodating portion 40 penetrates into and out of the support frame 10, even after the assembly of the lens driving device 1 is completed, the damper material enters the first space 41 from the outside. G can be injected. The damper material holding portion 30 disposed in the damper material accommodation portion 40 can hold the damper material G around the rod-shaped portion 32. Since the second space 42 of the damper material accommodation part 40 extends along the Z direction (optical axis direction), the movement of the rod-like part 32 along this is allowed, and the inner surface of the damper material accommodation part 40 And the outer periphery of the damper material holding part 30 do not interfere with each other.

  By providing such a damper material holding portion 30 on the lens frame 2 side and providing the damper material accommodating portion 40 on the support frame 10 side, after the assembly of the lens driving device 1 is completed and the lens driving device 1 is cleaned, It is possible to inject a damper material into the damper material accommodating portion 40 penetrating inside and outside, and to interpose the damper material in the gap between the outer peripheral surface of the damper material holding portion 30 and the inner surface of the damper material accommodating portion 40.

  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 by the intervention of the damper material. The vibration of the lens frame 2 can be effectively damped without affecting the force of the leaf spring that elastically supports the lens frame. Further, since the damper material can be injected after the lens driving device 1 is cleaned, it can be avoided that the damping material is blown off by the cleaning and the attenuation effect is reduced.

  FIG. 8 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 miniaturized and mounted with 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. 8B, it becomes possible to reduce the thickness of the entire device, increase the functionality of the camera function portion, and save space. .

  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. The damper material in the above-described embodiment is not particularly limited as long as it is a member having vibration damping properties such as an ultraviolet curable resin whose viscosity is changed by ultraviolet irradiation, a thermosetting resin whose viscosity is changed by heat addition, or grease. .

1: lens driving device, 2: lens frame, 2A: front surface, 2B: rear surface,
2A1, 2B1: Front mounting portion, 2S: Lens barrel mounting port,
2C: Rear side mounting part, 2D, 2E: Flange part, 2F: Guide convex part,
3: support part, 4: drive part, 5: cover, 5A: central opening,
6 (6A, 6B): position detection sensor,
7 (7A, 7B): position detecting magnet,
10: Support frame (movable support frame),
10A, 10B, 10C, 10D: front end mounting portion,
10E: rear end mounting portion, 10F: guide recess, 10P: magnet holding portion,
11, 12: Front leaf spring (shaft elastic support member),
11A, 11B, 12A, 12B: outside attachment part,
11A1, 11B1, 12A1, 12B1: Wire attachment part,
11C, 12C: inner mounting part,
11D, 12D: elastic part,
13: Rear leaf spring (shaft elastic support member),
13A: outside attachment part, 13B: inside attachment part,
13C: elastic part,
14A-14D: Support wire (runout elastic support member),
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: Focus magnet,
22 (22A, 22B): camera shake correction coil,
23 (23A, 23B): image stabilization magnet,
30: Damper material holding part, 31: Protruding part, 32: Bar-shaped part,
40: damper material accommodating portion, 41: first space, 42: second space,
100: camera, 200: portable information terminal, G: damper material

Claims (5)

A lens frame,
A support portion for elastically supporting the lens frame in the driving direction;
And a driving unit for driving the lens frame at least in the optical axis Direction,
The support portion includes a support frame disposed outside the lens frame,
The lens frame is provided with a damper material holding portion that protrudes outward and extends along the optical axis direction of the lens frame ,
The support frame, holder bumpers material container to form a gap tamper material around the damper member holding portion is deployed is provided surrounding the damper material holding portion,
The damper material accommodating portion is a space extending on the optical axis so as to allow the damper material holding portion to move back and forth in the optical axis direction, and is opposite to the lens frame in a direction orthogonal to the optical axis. And a space penetrating the support frame toward the lens.   The damper material holding portion includes a protruding portion protruding outside the lens frame and a rod-shaped portion extending along the optical axis direction, and the gap is formed around the rod-shaped portion. The lens driving device according to claim 1. The support part is
An axial elastic support member that elastically supports the lens frame along the optical axis direction with respect to the support frame ;
A deflection elastic support member that elastically supports the lens frame along a direction intersecting the optical axis;
The lens driving device according to claim 1 or 2, characterized in that it comprises a base support member for supporting through the deflection elastic support members the support frame. The camera provided with the lens drive device of any one of Claims 1-3 . The portable electronic device provided with the lens drive device of any one of Claims 1-3 .

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