Lens driving device, camera module and camera mounting device having shake-correcting function and auto-focusing function

• US 10,725,313 B2
• Filed: 11/20/2015
• Issued: 07/28/2020
• Est. Priority Date: 11/20/2015
• Status: Active Grant

• Current Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Original Assignee: Mitsumi Electric Co., Ltd. (MinebeaMitsumi Inc.)
• Inventors: Sugawara, Masayoshi
• Primary Examiner(s): Lavarias, Arnel C
• Application Number:
  US15/777,712
• Publication Number:
  US 20180348538A1
• Time in Patent Office: 1,712 Days
• Field of Search: 359554, 359557, 2502011, 2502012, 2502014, 34820899, 3482082, 34820812, 396 52, 396 55
• 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 7/021 for more than one lens
• CPC Class Codes: G03B 13/36 Autofocus systems
• CPC Class Codes: G03B 2205/0023 by tilting or inclining one or more optical elements with respect to the optical axis
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: G03B 5/06 Swinging lens about normal to the optical axis
• CPC Class Codes: H02K 41/0356 moving along a straight path
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/57 Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• CPC Class Codes: H04N 23/67 Focus control based on electronic image sensor signals
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

The lens driving device is provided with a driving unit for OIS, using a driving force of a first voice coil motor to enable an OIS movable unit to swing in a plane orthogonal to the optical axis direction with respect to an OIS fixed unit; a driving unit for AF, using the driving force of a second voice coil motor to enable an AF movable unit to move along the optical axis direction with respect to an AF fixed unit; a supporting unit for OIS, formed of a first elastomeric material, and having a first biaxial hinge structure moveably supporting the OIS movable unit in the plane orthogonal to the optical axis direction; and a supporting unit for AF, formed of a second elastomeric material, and having a second biaxial hinge structure moveably supporting the AF movable unit along the optical axis direction.

Claims

1. A lens driving device, comprising:

a shake-correcting driving part, the shake-correcting driving part including;

a shake-correcting magnet part disposed at a periphery of a lens part;

a shake-correcting coil part disposed separately from the shake-correcting magnet part; and

a shake-correcting supporting part configured to support a shake-correcting movable part including the shake-correcting magnet part with respect to a shake-correcting fixing part including the shake-correcting coil part in a state where the shake-correcting movable part is separated from the shake-correcting fixing part in a light axis direction,

wherein the shake-correcting driving part performs shake correction by swaying the shake-correcting movable part with respect to the shake-correcting fixing part in a plane orthogonal to the light axis direction by use of a driving force of a first voice coil motor including the shake-correcting coil part and the shake-correcting magnet part,

wherein the shake-correcting supporting part is made of a first elastomer material, and has a first biaxial hinge structure for supporting the shake-correcting movable part such that the shake-correcting movable part is movable in the plane orthogonal to the light axis direction, and

wherein the shake-correcting movable part includes an auto-focusing driving part, the auto-focusing driving part including;

an auto-focusing magnet part disposed separately from the auto-focusing coil part in a radial direction, and

an auto-focusing supporting part configured to support an auto-focusing movable part including the auto-focusing coil part with respect to an auto-focusing fixing part including the auto-focusing magnet part,

wherein the auto-focusing driving part performs automatic focusing by moving the auto-focusing movable part in the light axis direction with respect to the auto-focusing fixing part by use of a driving force of a second voice coil motor including the auto-focusing coil part and the auto-focusing magnet part, and

wherein the auto-focusing supporting part is made of a second elastomer material, and has a second biaxial hinge structure for supporting the auto-focusing movable part such that the auto-focusing movable part is movable in the light axis direction.

2. The lens driving device according to claim 1,

wherein the shake-correcting supporting part includes:

an upper frame body disposed opposite to the shake-correcting fixing part in the light axis direction,

first side supporting members disposed opposite to each other in a first direction orthogonal to the light axis direction, each of the first side supporting members coupling the upper frame body and the shake-correcting movable part, and

second side supporting members disposed opposite to each other in a second direction orthogonal to the light axis direction and the first direction, each of the second side supporting members coupling the upper frame body and the shake-correcting fixing part;

wherein each of the first side supporting members includes two Y-hinge parts which are thinner than other portions in the each of the first side supporting members and are configured to operate about the second direction, the each of the first side supporting members being configured to be bent such that bending directions at the two Y-hinge parts are opposite directions when the shake-correcting movable part moves in the first direction; and

wherein each of the second side supporting members includes two X-hinge parts which are thinner than other portions in the each of the second side supporting members and are configured to operate about the first direction, the each of the second side supporting members being configured to be bent such that bending directions at the two X-hinge parts are opposite directions when the shake-correcting movable part moves in the second direction.

3. The lens driving device according to claim 2, wherein the first side supporting members and the second side supporting members are columnar members suspended from the upper frame body.

4. The lens driving device according to claim 3,

wherein the upper frame body has a rectangular shape in plan view;

wherein the first side supporting members are formed at end portions of two sides of the upper frame body, the two sides being opposite to each other in the first direction; and

wherein the second side supporting members are formed at end portions of the other two sides of the upper frame body, the other two sides being opposite to each other in the second direction.

5. The lens driving device according to claim 1,

wherein the auto-focusing supporting part includes:

a side wall disposed at the auto-focusing fixing part on a side of the auto-focusing movable part, and

two arms configured to couple the side wall and the auto-focusing movable part in a cantilever fashion; and

wherein each of the two arms includes two hinge parts which are thinner than other portions in the each of the two arms and are configured to operate about a direction orthogonal to the light axis direction, the each of the two arms being configured to be bent such that bending directions at the two hinge parts are opposite directions when the auto-focusing movable part moves in the light axis direction.

6. The lens driving device according to claim 1,

wherein the auto-focusing magnet part has a double-sided quadrupole cuboid shape, and is disposed along a first direction orthogonal to the light axis direction;

wherein the auto-focusing coil part has an ellipsoidal shape, and is disposed such that a coil surface of the auto-focusing coil part is opposite to the auto-focusing magnet part and that magnetic fluxes from the auto-focusing magnet intersecting two long side portions of the auto-focusing coil part are in opposite directions; and

wherein the auto-focusing supporting part supports the auto-focusing movable part on a side opposite to the auto-focusing coil part.

7. The lens driving device according to claim 6,

wherein the shake-correcting magnet part includes:

a first shake correction magnet including the auto-focusing magnet part, and

a second shake correction magnet having a structure similar to a structure of the first shake correction magnet, and disposed along a second direction orthogonal to the light axis direction and the first direction;

wherein the shake-correcting coil part includes a first shake correction coil and a second shake correction coil corresponding to the first shake correction magnet and the second shake correction magnet;

wherein the first shake correction coil has an ellipsoidal shape, and is disposed such that a coil surface of the first shake correction coil is opposite to a surface of the first shake correction magnet on an imaging side in the light axis direction and that magnetic fluxes from the auto-focusing magnet intersecting two long side portions of the first shake correction coil are in opposite directions; and

wherein the second shake correction coil has an ellipsoidal shape, and is disposed such that a coil surface of the second shake correction coil is opposite to a surface of the second shake correction magnet on the imaging side in the light axis direction and that magnetic fluxes from the auto-focusing magnet intersecting two long side portions of the second shake correction coil are in opposite directions.

8. A camera module, comprising:

the lens part; and

the lens driving device according to claim 1.

9. A camera mounting apparatus that is an information apparatus or a transport apparatus, wherein the camera mounting apparatus comprises the camera module according to claim 8.