Lens driving apparatus

Patent metadata

Field	Value
Publication number	US-11579402-B2
Application number	US-202017034992-A
Country	US
Kind code	B2
Filing date	Sep 28, 2020
Priority date	Dec 19, 2014
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

One embodiment of a lens driving apparatus may comprise: a bobbin having a first coil disposed on the outer circumferential surface thereof; a position detection sensor which is disposed on the outer circumferential surface of the bobbin and which moves together with the bobbin; a first magnet disposed opposite to the first coil; a housing for supporting the first magnet; upper and lower elastic members which are coupled to the bobbin and the housing; and a plurality of wirings which are disposed on the outer circumferential surface of the bobbin so as to electrically connect at least one of the upper or lower elastic members with the position detection sensor.

First claim

The invention claimed is:

1. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing;
a first coil disposed on the bobbin;
a position sensor disposed on the bobbin;
a first magnet disposed on the housing so as to be opposite to the first coil;
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
a second coil disposed under the first magnet so as to be opposite to the first magnet;
a circuit board disposed under the second coil;
a supporting member electrically connecting the upper elastic member and the circuit board; and
a conductive pattern disposed on a surface of the bobbin and electrically connected to the position sensor.

2. The lens moving apparatus according to claim 1 , wherein the conductive pattern is electrically connected to the upper elastic member.

3. The lens moving apparatus according to claim 1 , wherein the bobbin comprises a recess in which the position sensor is disposed.

4. The lens moving apparatus according to claim 3 , wherein one end of the conductive pattern is disposed in the recess, and the one end of the conductive pattern is connected to the position sensor.

5. The lens moving apparatus according to claim 4 , wherein another end of the conductive pattern is connected to the upper elastic member.

6. The lens moving apparatus according to claim 1 , wherein the conductive pattern comprises a plurality of patterns and one end of the plurality of patterns is electrically connected to the position sensor.

7. The lens moving apparatus according to claim 6 , wherein the upper elastic member comprises a plurality of elastic members connected to the plurality of patterns, respectively, and
wherein the supporting member comprises a plurality of supporting members connected to the plurality of elastic members, respectively.

8. The lens moving apparatus according to claim 1 , wherein the position sensor is disposed to be spaced apart from the first coil in a first direction that is parallel to an optical axis.

9. The lens moving apparatus according to claim 1 , wherein the position sensor is positioned higher than the first coil.

10. The lens moving apparatus according to claim 1 , wherein a distance between the first magnet and the position sensor in a first direction that is parallel to an optical axis is 0.05 mm to 0.3 mm.

11. The lens moving apparatus according to claim 1 , wherein the first magnet is configured such that an N pole and an S pole are disposed in a second direction and/or a third direction, which is perpendicular to a first direction that is parallel to an optical axis.

12. The lens moving apparatus according to claim 1 , wherein the first magnet comprises a plurality of magnets disposed in a first direction that is parallel to an optical axis, and
wherein each of the plurality of magnets is configured such that an N pole and an S pole are disposed in a second direction and/or a third direction, that is perpendicular to the first direction.

13. The lens moving apparatus according to claim 1 , wherein a center of the position sensor is positioned above an upper surface of the first magnet.

14. The lens moving apparatus according to claim 1 , wherein a center of the position sensor is positioned under an upper surface of the first magnet.

15. The lens moving apparatus according to claim 1 , wherein a distance between the position sensor and the first magnet in a second direction and/or a third direction, which is perpendicular to the first direction, is 0.01 mm to 0.5 mm.

16. The lens moving apparatus according to claim 1 , comprising an adhesive coated on a surface of the bobbin and an upper surface of the conductive pattern.

17. The lens moving apparatus according to claim 1 , comprising a base disposed below the bobbin, and
wherein the second coil comprises a circuit member disposed on the circuit board and coils formed in the circuit member.

18. The lens moving apparatus according to claim 1 , comprising a lower elastic member coupled to a lower portion of the bobbin and a lower portion of the housing.

19. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing and comprising a recess;
a first coil disposed on the bobbin;
a position sensor disposed in the recess of the bobbin;
a first magnet disposed on the housing so as to be opposite to the first coil;
an upper elastic member coupled to an upper portion of the bobbin and an upper portion of the housing;
a second coil disposed under the first magnet so as to be opposite to the first magnet;
a circuit board disposed under the second coil;
a supporting member electrically connecting the upper elastic member and the circuit board; and
a conductive pattern disposed on a surface of the bobbin and electrically connected to the position sensor,
wherein the conductive pattern comprises:
one end disposed in the recess of the bobbin and connected to the position sensor; and
another end connected to the upper elastic member.

20. A camera module comprising:
a lens moving apparatus according to claim 1 ;
a lens barrel coupled to the lens moving apparatus; and
an image sensor.

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Sang Ok
• Yoo Hyune O
• Lee Seong Min

Classifications

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title

• G02B7/08

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

• H02K41/0356

  moving along a straight path · CPC title

• H02K11/215

  Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements · CPC title

• G03B2205/0069

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