Lens driving device and camera module comprising same

Patent metadata

Field	Value
Publication number	US-10114229-B2
Application number	US-201415109590-A
Country	US
Kind code	B2
Filing date	Dec 30, 2014
Priority date	Jan 2, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A lens driving device according to an embodiment comprises: a bobbin wherein at least one lens is installed inside thereof and a first coil is installed on the outer circumferential surface thereof; a first magnet arranged around the bobbin so as to be opposite to the first coil; a housing for supporting the first magnet; upper and lower elastic members coupled with the bobbin and the housing; a first sensor for sensing displacement of the bobbin in the first direction; a second magnet arranged so as to be opposite to the first sensor; a base arranged to be spaced apart from the housing by a certain distance; a second coil arranged so as to be opposite to the first magnet; a circuit board whereon the second coil is installed; a plurality of support members for supporting the housing so as to be movable in the second and third directions which are orthogonal to the first direction with respect to the base and for connecting at least one of the upper and lower elastic members to the circuit board; and a second sensor for sensing displacement of the housing in the second or third direction with respect to the base.

First claim

The invention claimed is:

1. A lens driving apparatus, comprising:
a housing;
a bobbin disposed in the housing;
a first coil disposed on the bobbin;
a first magnet disposed on the housing and facing the first coil;
a circuit board comprising a second coil disposed below the first magnet and facing the first magnet;
an upper elastic member disposed on an upper portion of the housing;
a first sensor detecting displacement of the bobbin;
a second magnet disposed to face the first sensor;
a second sensor detecting displacement of the housing;
a base disposed below the housing; and
a plurality of support members connecting the upper elastic member and the circuit board,
wherein the upper elastic member comprises six upper elastic members,
wherein the first sensor is electrically connected to four of the six upper elastic members,
wherein the first coil is electrically connected to two of the six upper elastic members,
wherein the housing comprises a first corner area including a first corner, and
wherein two of the plurality of support members are disposed in the first corner area.

2. The lens driving apparatus according to claim 1 , further comprising a lower elastic member disposed on a lower portion of the housing.

3. The lens driving apparatus according to claim 2 , wherein the lower elastic member comprises at least two first and second lower elastic members, which are separated from each other, and
wherein the first coil is electrically connected to the two of the plurality of support members via the first and second lower elastic members.

4. The lens driving apparatus according to claim 1 , wherein the first sensor is disposed on the housing and the second magnet is disposed on the bobbin.

5. The lens driving apparatus according to claim 4 , further comprising a sensor substrate,
wherein the first sensor is coupled to the sensor substrate and the sensor substrate is disposed on the housing.

6. The lens driving apparatus according to claim 5 , wherein the sensor substrate comprises:
a body coupled with the first sensor; and
four contact portions connecting between the four of the six upper elastic members and the first sensor.

7. The lens driving apparatus according to claim 1 , wherein the first and second magnets are integrally formed with each other.

8. The lens driving apparatus according to claim 7 , wherein the first sensor and the first magnet are disposed to face each other such that a center horizontal line, which extends through a center of the first sensor and is perpendicular to an optical axis, is aligned with an upper end of the first magnet.

9. The lens driving apparatus according to claim 8 , wherein the bobbin is configured to move upward and downward along the optical axis direction with respect to the center horizontal line.

10. The lens driving apparatus according to claim 1 , wherein the first and second magnets are formed separately from each other.

11. A camera module comprising:
a lens driving apparatus according to claim 1 ; and
an image sensor.

12. A lens driving apparatus, comprising:
a housing;
a bobbin disposed in the housing;
a first coil disposed on the bobbin;
a first magnet disposed on the housing and facing the first coil;
a circuit board comprising a second coil disposed below the first magnet and facing the first magnet;
an upper elastic member disposed on an upper portion of the housing;
a first sensor detecting displacement of the bobbin;
a second magnet disposed to face the first sensor;
a second sensor detecting displacement of the housing;
a base disposed below the housing; and
a plurality of support members connecting the upper elastic member and the circuit board,
wherein the housing comprises a first corner area including a first corner,
wherein the upper elastic member comprises a first upper elastic member and a second upper elastic member,
wherein the plurality of support members comprises a first wire and a second wire,
wherein the first wire and the second wire are disposed in the first corner area, and
wherein the first upper elastic member is connected with the first wire and the second upper elastic member is connected with the second wire.

13. The lens driving apparatus according to claim 12 , wherein the upper elastic member further comprises third to sixth upper elastic members.

14. The lens driving apparatus according to claim 13 , wherein the first coil is electrically connected to any one of the first and second upper elastic members.

15. The lens driving apparatus according to claim 14 , wherein the first sensor is electrically connected to any one of the third to sixth upper elastic members.

16. A camera module comprising:
a lens driving apparatus according to claim 12 ; and
an image sensor.

17. A lens driving apparatus, comprising:
a housing;
a bobbin disposed in the housing;
a first coil disposed on the bobbin;
a first magnet disposed on the housing and facing the first coil;
a circuit board comprising a second coil disposed below the first magnet and facing the first magnet;
an upper elastic member disposed on an upper portion of the housing;
a first sensor detecting displacement of the bobbin;
a second magnet disposed to face the first sensor;
a second sensor detecting displacement of the housing;
a base disposed below the housing; and
a plurality of support members connecting the upper elastic member and the circuit board,
wherein the upper elastic member comprises first to sixth upper elastic members,
wherein the first sensor is electrically connected to four of the plurality of support members via the first to fourth upper elastic members, and
wherein the first coil is electrically connected to two of the plurality of support members via the fifth and sixth upper elastic members.

18. The lens driving apparatus according to claim 17 , wherein the housing comprises a first corner area including a first corner, and
wherein at least a portion of each of two of the first to sixth upper elastic members is disposed in the first corner area.

19. The lens driving apparatus according to claim 17 , wherein the housing comprises a first corner area including a first corner, a second corner area opposite to the first corner area, a third corner area disposed between the first corner area and the second corner area and a fourth corner area opposite to the third corner area,
wherein the plurality of support members comprises first to sixth support members, and
wherein the first support member is disposed in the first corner area, the second support member is disposed in the second corner area, the third and fourth support members are disposed in the third corner area and the fifth and sixth support members are disposed in the fourth corner area.

20. A camera module comprising:
a lens driving apparatus according to claim 17 ; and
an image sensor.

Assignees

• Lg Innotek Co Ltd

Inventors

• Jung Tae Jin
• Min Sang Jun
• Lee Sung Guk

Classifications

• G03B5/00 Primary

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G03B3/10

  Power-operated focusing · CPC title

• H02K41/0356

  moving along a straight path · CPC title

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · CPC title

• G02B7/08

  adapted to co-operate with a remote control mechanism · CPC title