Lens drive device, camera module, and camera mounting device

• US 10,371,921 B2
• Filed: 06/15/2016
• Issued: 08/06/2019
• Est. Priority Date: 06/25/2015
• Status: Expired due to Fees

• Current Assignee: Mitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (Minebea Mitsumi, Inc.)
• Inventors: Enta, Yohei
• Primary Examiner(s): Dinh, Jack
• Application Number:
  US15/738,243
• Publication Number:
  US 20180188474A1
• Time in Patent Office: 1,147 Days
• 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 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 5/02 Lateral adjustment of lens
• CPC Class Codes: H04N 23/00 Cameras or camera modules comprising electronic image sensors; Control thereof
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils

Abstract

Provided is a lens drive device for which, before the device itself is assembled, the operation by an OIS voice coil motor in a shake correcting actuator is confirmed, so as to reduce the production costs in case of an operation defect and to achieve good production. The device comprises: a mobile body configured so that a magnet is disposed in a frame-shaped retaining member in which an imaging module is installed; a fixed body which has a base member and which is configured so that a coil is disposed in the base member; a support part that tiltably supports the mobile body relative to the fixed body; and a main substrate to which the fixed body is fixed. The fixed body includes a coil substrate having a terminal to which the coil is connected, and the coil is connected to a circuit of the main substrate via the terminal.

Claims

1. A lens driving device configured to correct shake by tilting an imaging module with a driving force of a voice coil motor including a coil part and a magnet part, the imaging module including a lens part and an imaging device, the lens driving device comprising:

a movable part including a frame-shaped holding member on which the imaging module is to be placed, wherein the magnet part is disposed to the frame-shaped holding member;

a fixing part including a base member, wherein the coil part is disposed to the base member;

a supporting part to be disposed to the base member, and configured to support the movable part such that the movable part is tiltable with respect to the fixing part; and

a main board including a circuit that enables shake correction by driving the voice coil motor by electric supply to the coil part, the fixing part being fixed to the main board, wherein;

the fixing part includes a coil board including a terminal part to which the coil part is connected, and

the coil part is configured to be connected to the circuit of the main board via the terminal part of the coil board.

2. The lens driving device according to claim 1, wherein:

the coil board is a flexible printed circuit.

3. The lens driving device according to claim 1, wherein:

the main board is a rigid-flexible printed wiring board.

4. The lens driving device according to claim 1, wherein:

the coil part and the magnet part respectively include;

a first coil and a first magnet configured to move the movable part in a first direction orthogonal to an optical-axis direction of the lens part, and

a second coil and a second magnet, respectively, configured to move the movable part in a second direction orthogonal to the optical-axis direction and to the first direction;

the fixing part includes first and second Hall elements configured to detect magnetic forces of the first and the second magnets, respectively;

the terminal part of the coil board is connected to the first and the second coils, and connected to the first and the second Hall elements; and

the first and the second coils, and the first and the second Hall elements are connected to the circuit of the main board via the terminal part of the coil board.

5. The lens driving device according to claim 1, wherein:

the supporting part is an elastic supporting part configured to support the movable part such that the movable part is tiltable with respect to the fixing part by elastic deformation of the elastic supporting part; and

the frame-shaped holding member includes;

a frame-shaped module attachment portion to which the imaging module is to be mounted, and

a supporting-part attachment portion disposed at an inside of the frame-shaped module attachment portion, the supporting-part attachment portion including a stepped surface to which the supporting part is to be attached, the stepped surface being lower than the frame-shaped module attachment portion.

6. The lens driving device according to claim 1, wherein:

the coil board is disposed on the base member, and the terminal part of the coil board laterally extends out from the base member.

7. A camera module comprising:

the lens driving device according to claim 1;

the imaging module including the lens part and the imaging device, the imaging module being configured to be bonded to the frame-shaped holding member; and

a shake detection part configured to detect shake of the imaging module.

8. The camera module according to claim 7, wherein:

the imaging module has an auto-focusing function.

9. A camera-mounted device that is an information device or a transporting device, the camera-mounted device comprising:

the camera module according to claim 7.