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

• US 20140177056A1
• Filed: 12/23/2013
• Published: 06/26/2014
• Est. Priority Date: 12/26/2012
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
• Inventors: HAYASHI, Ichiro, ENTA, Yohei
• Granted Patent: US 9,405,088 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 7/02 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 having an auto-focusing first coil; a lens holder moving section that supports the lens holder in such a manner that the lens holder is movable in a first direction; a driving magnet disposed at four corners of the lens holder moving section and moves the lens holder in the first direction in cooperation with the first coil; a camera-shake correction second coil that moves the lens holder in a second direction and a third direction in cooperation with the driving magnet, the second direction and the third direction corresponding to diagonal directions of the lens holder moving section; and a supporting section that supports the lens holder moving section in such a manner that the lens holder moving section is movable in the second direction and the third direction.

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 square 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;

a driving magnet 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 the lens holder in a second direction and a third direction in cooperation with the driving magnet, the second direction and the third direction corresponding to diagonal directions of the lens holder moving section; and

a supporting section configured to support the lens holder moving section in such a manner that the lens holder moving section is movable in the second direction and the third direction.

2. The lens driving apparatus according to claim 1 further comprising a position detecting section configured to detect a position of the lens holder moving section in the second direction and the third direction.

3. The lens driving apparatus according to claim 2 further comprising:

a first position detecting magnet disposed along a first side of the lens holder moving section and magnetized in the second direction; and

a second position detecting magnet disposed along a second side of the lens holder moving section different from the first side and magnetized in the third direction, wherein

the position detecting section includes

a first Hall device disposed to face the first position detecting magnet in the first direction, and

a second Hall device disposed to face the second position detecting magnet in the first direction.

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

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

the lens holder includes:

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

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

an inner peripheral surface of the first coil is exposed.

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

the lens holder includes a protrusion protruding radially outwardly, and

the lens holder moving section includes an engaging section at which the protrusion is engaged, the engaging section being configured to restrict the movement of the lens holder.

7. 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.

8. A camera-equipped mobile terminal comprising the camera module according to claim 7.