LENS DRIVING APPARATUS

• US 20110176046A1
• Filed: 11/17/2010
• Published: 07/21/2011
• Est. Priority Date: 11/17/2009
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Inventors: CHAN, YI-LANG, HU, CHAO-CHANG, WU, FU-YUAN
• Granted Patent: US 8,531,534 B2
• Time in Patent Office: Days
• US Class Current: 348/335
• 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 7/04 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: G03B 3/10 Power-operated focusing
• CPC Class Codes: H02K 41/0356 moving along a straight path
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations

Abstract

A lens driving apparatus comprises a lens portion having at least one lens (21), a first driving portion (39) to cause a movement of said lens portion relatively to a base portion (40) along a vertical direction of a light axis (L) of said lens portion, and a second driving portion (38) to cause a movement of said lens portion relatively to said base portion along said light axis.

Claims

1. A lens driving apparatus comprising

a lens portion having at least one lens,

a first driving portion to cause a movement of said lens portion relatively to a base portion along a vertical direction of a light axis of said lens portion, and

a second driving portion to cause a movement of said lens portion relatively to said base portion along said light axis.

2. The lens driving apparatus as set forth in claim 1 further comprising

a focus portion having said lens portion and said second driving portion, wherein

said first driving portion causes a movement of said focus portion relatively to said base portion along the vertical direction of said light axis.

3. The lens driving apparatus as set forth in claim 2 wherein

said first driving portion includes a first magnet mounted to said focus portion, and a first coil mounted to said base portion and arranged to face said first magnet.

4. The lens driving apparatus as set forth in claim 2 or 3 further comprising

at least three suspension wires to connect said focus portion and said base portion so as to allow a relative movement.

5. The lens driving apparatus as set forth in claim 2 or 3, wherein

said focus portion comprises a focus base able to be moved relatively to said base portion by said first driving portion and a spring connecting to said lens portion movably relatively to said focus base,

said second driving portion comprises a second coil equipped to said lens portion and a second magnet equipped to said focus base and arranged to face said second coil.

6. The lens driving apparatus as set forth in claim 5, wherein

a tip end of at least one suspension wire among at least said three suspension wires is electrically connected to said second coil through said spring,

a base end of said one suspension wire is electrically connected to an external connection base plate included in said base portion.

7. The lens driving apparatus as set forth in claim 6, wherein

said spring portion includes a B-spring arranged at a base side near said base portion in said lens portion and a F-spring arranged at an opposite side of said base side in said lens portion,

the tip end of said at least one of said suspension wire is electrically connected to said second coil through said F-spring.

8. The lens driving apparatus as set forth in claim 4, wherein

said at least three suspension wires are composed of four suspension wires,

said first driving portion can make said focus portion move to X-direction and Y-direction which are vertical direction to said light axis and mutually orthogonal,

a rigidity to said X-direction of said four suspension wires and a rigidity to said Y-direction of said four suspension wires are substantially equal.

9. The lens driving apparatus as set forth in claim 4, wherein

said at least three suspension wires have a substantial circular shape cross section respectively.

10. The lens driving apparatus as set forth in claim 5 further comprising

a magnet holding plate composed of magnetic body equipped to said focus portion and arranged between said first magnet and said second magnet.

11. The lens driving apparatus as set forth in claim 10, wherein

said magnet holding plate has a ring shape, a circumference thereof is substantially rectangular,

said first magnet is composed of four rod-like magnets which are arranged at positions corresponding to respective sides of said magnet holding plate viewing from a direction of said light axis,

said second magnet is composed of four individual piece magnets arranged at positions corresponding to respective corners of said magnet holding plate viewing from a direction of said light axis.

12. The lens driving apparatus as set forth in any one of claims 1 to 3, wherein

an image sensor to detect light which comes through said lens portion is arranged on said base portion.