LENS DRIVING APPARATUS, CAMERA MODULE, AND CAMERA-EQUIPPED MOBILE TERMINAL

• US 20180011283A1
• Filed: 09/11/2017
• Published: 01/11/2018
• Est. Priority Date: 12/26/2012
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: HAYASHI, Ichiro, ENTA, Yohei
• Granted Patent: US 10,073,236 B2
• Time in Patent Office: Days
• 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 7/02 for lenses supports for magnifying lenses G02B25/002
• CPC Class Codes: G02B 7/025 using glue
• CPC Class Codes: G02B 7/04 with mechanism for focusing or varying magnification
• 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 17/02 Bodies
• CPC Class Codes: H04N 23/00 Cameras or camera modules comprising electronic image sensors; Control thereof
• CPC Class Codes: H04N 23/40 Circuit details for pick-up tubes
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

A lens driving apparatus includes: a lens holder including an auto-focusing first coil; a lens holder moving section; driving magnets disposed at four corners of the lens holder moving section; a camera-shake correction second coil; a plurality of suspension wires; an elastic member; and at least one damper compound, wherein the elastic member comprises first and second leaf springs mounted to first and second ends of the lens holder moving section, respectively, the second leaf spring is arranged apart from the fixed member compared to the first leaf spring, the fixed member is disposed at a position in the vicinity of the first leaf spring, the plurality of suspension wires extend along the first direction, are fixed to the fixed member and the second leaf spring, and the damper compound is disposed at a position in the vicinity of the second leaf spring.

Claims

1. A lens driving apparatus comprising:

a lens holder to which a lens barrel can be attached, the lens holder including an auto-focusing first coil;

a lens holder moving section that is rectangle as viewed in a plane orthogonal to a first direction along an optical axis, the lens holder moving section being configured to support the lens holder in such a manner that the lens holder is movable in the first direction;

driving magnets disposed at four corners of the lens holder moving section, the driving magnet being configured to move the lens holder in the first direction in cooperation with the first coil;

a camera-shake correction second coil configured to move a movable section in a second direction and a third direction in cooperation with the driving magnet, the movable section including the lens holder, the lens holder moving section, and the driving magnet, the second direction and the third direction corresponding to diagonal directions of the lens holder moving section;

a fixed member disposed apart from the movable section in the first direction, the fixed member including the second coil;

a plurality of suspension wires configured to support the movable section with respect to the fixed member in such manner that the movable member is movable in the second direction and the third direction;

an elastic member configured to support the lens holder in such manner that the lens holder is shiftable in the first direction, the elastic member being mounted to the lens holder moving section; and

at least one damper compound disposed so as to enclose at least one of the plurality of suspension wires, the damper compound being configured to suppress unnecessary resonance in the lens holder moving section, wherein;

the lens holder moving section has first and second ends opposite to each other in the first direction,

the elastic member comprises first and second leaf springs mounted to the first and the second ends of the lens holder moving section, respectively,

the second leaf spring is arranged apart from the fixed member compared to the first leaf spring,

the fixed member is disposed at a position in the vicinity of the first leaf spring,

the plurality of suspension wires extend along the first direction, and have first end portions fixed to an outer portions of the fixed member and second end portions fixed to a wire fixation part of the second leaf spring, and

the damper compound is disposed at a position in the vicinity of the second leaf spring.

2. The lens driving apparatus according to claim 1, wherein

the lens holder moving section comprises an extending portion extending so as to enclose the at least one suspension wire at a position in the vicinity of the wire fixation part of the second leaf spring, and

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

3. The lens driving apparatus according to claim 1, wherein the first coil is wound in a substantially octagonal cylindrical form.

4. The lens driving apparatus according to claim 1, wherein the lens holder is an annular frame formed in an octagonal shape as viewed in a plane orthogonal to the first direction so as to match an external shape of the first coil.

5. The lens driving apparatus according to claim 1, wherein the lens barrel is fixed to the lens holder by bonding.

6. The lens driving apparatus according to claim 1, wherein

the lens holder is composed of:

a first coil composed of an air-core coil; and

a coil holding member configured to sandwich the first coil, and

an inner peripheral surface of the first coil is exposed.

7. The lens driving apparatus according to claim 1, wherein

the lens holder moving section comprises a magnet holder configured to hold the driving magnets,

the lens holder comprises a protrusion protruding radially outwardly, and

the magnet holder comprises an engaging section which is to be engaged with the protrusion and restricts movement of the lens holder.

8. A camera module comprising:

the lens driving apparatus according to claim 1;

a lens barrel held by the lens holder; and

an imaging section configured to capture a subject image formed by the lens barrel.

9. A camera-equipped mobile terminal comprising the camera module according to claim 8.