LENS HOLDER DRIVING DEVICE INCLUDING DAMPER COMPOUND SUPPRESSING UNDESIRED RESONANCE

• US 20130050828A1
• Filed: 08/15/2012
• Published: 02/28/2013
• Est. Priority Date: 08/24/2011
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: SATO, Keiichi, SUGAWARA, Masayoshi, MORIYA, Akihiro, ARIJI, Makoto
• Granted Patent: US 9,151,963 B2
• Time in Patent Office: Days
• US Class Current: 359/557
• CPC Class Codes: G02B 27/64 Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
• CPC Class Codes: G02B 27/646 compensating for small deviations, e.g. due to vibration or shake movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68
• CPC Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: G02B 7/09 adapted for automatic focusing or varying magnification
• CPC Class Codes: G03B 2205/0015 by displacing one or more optical elements normal to the optical axis
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H04N 23/50 Constructional details
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils

Abstract

A lens holder driving device includes a lens holder moving portion, a fixed member, suspension wires, and a damper compound. In the lens holder moving portion, a lens holder moves in an optical axis and in first and second directions which are orthogonal to the optical axis and which are perpendicular to each other. The fixed member is disposed apart from the lens holder moving portion in the direction of the optical axis. The suspension wires have first end portions fixed to the fixed member at outer regions thereof, extending along the optical axis, having second end portions fixed to an elastic member mounted to the lens holder moving portion, and swingably supporting the lens holder moving portion in the first direction and the second direction. The damper compound is disposed so as to enclose at least one suspension wire and suppresses undesired resonance in the lens holder moving portion.

Claims

1. A lens holder driving device comprising:

a lens holder moving portion in which a lens holder moves in a direction of an optical axis and in first and second directions which are orthogonal to the optical axis and which are perpendicular to each other; and

a fixed member disposed apart from said lens holder moving portion in the direction of the optical axis,

wherein said lens holder driving device comprises;

an elastic member mounted to said lens holder moving portion;

a plurality of suspension wires having first end portions fixed to said fixed member at outer regions thereof, said plurality of suspension wires extending along the optical axis and having second end portions fixed to said elastic member, said plurality of suspension wires swingably supporting said lens holder moving portion in the first direction and the second direction; and

at least one damper compound disposed so as to enclose at least one suspension wire among said plurality of suspension wires, said damper compound suppressing undesired resonance in said lens holder moving portion.

2. The lens holder driving device as claimed in claim 1, wherein said lens holder moving portion has first and second ends opposite to each other in the direction of the optical axis,

wherein said elastic member comprises first and second leaf springs, mounted to the first and the second ends of said lens holder moving portion, respectively, supporting said lens holder in the direction of the optical axis shiftably,

wherein said fixed member is disposed at a position in the vicinity of said second leaf spring,

wherein the second end portion of said at least one suspension wire is fixed to said first leaf spring at a wire fixing portion thereof.

3. The lens holder driving device as claimed in claim 2, wherein said lens holder moving portion comprises an extending portion extending so as to enclose said at least one suspension wire with a space at a position in the vicinity of said wire fixing portion,

wherein said at least one damper compound is disposed in said extending portion so as to enclose said at least one suspension wire.

4. The lens holder driving device as claimed in claim 1, wherein said fixed member comprises:

a base; and

a coil board fixed on said base, said coil board fixing the first end portions of said plurality of suspension wires at the outer regions thereof and including a driving coil driving said lens holder moving portion formed thereon,

wherein said driving coil comprises driving coil portions mounted on said coil board so as to oppose to permanent magnet pieces mounted to said lens holder moving portion.

5. A camera module comprising the lens holder driving device as claimed in claim 1, a lens barrel held in said lens holder, and an image pickup device picking up a subject image formed by said lens barrel.

6. A camera-equipped mobile terminal in which the camera module as claimed in claim 5 is mounted.