Lens moving apparatus

Patent metadata

Field	Value
Publication number	US-10649227-B2
Application number	US-201816122568-A
Country	US
Kind code	B2
Filing date	Sep 5, 2018
Priority date	Oct 17, 2014
Publication date	May 12, 2020
Grant date	May 12, 2020

Abstract

A lens moving apparatus includes a bobbin including a first coil, a first magnet facing the first coil, a housing supporting the first magnet, upper and lower elastic members coupled to the bobbin and the housing, a base spaced apart from the housing, a second coil unit, which faces the first magnet and includes a second coil, a circuit board on which the second coil unit is mounted, a plurality of support members, which support the housing such that the housing is movable in second and/or third directions and which connect at least one of the upper and lower elastic members to the circuit board, and a second sensor detecting displacement of the housing in the second and/or third directions, wherein the center of the second sensor is disposed so as not to overlap the second coil.

First claim

What is claimed is:

1. A lens moving apparatus comprising:
a base;
a circuit board disposed on the base;
a circuit member disposed on the circuit board
a bobbin disposed on the base;
a first coil disposed on the bobbin;
a first magnet facing the first coil;
a second coil facing the first magnet;
an elastic member coupled to the bobbin;
a support member connecting the elastic member and at least one of the circuit board and the circuit member; and
a second sensor disposed on a lower surface of the circuit board,
wherein the second coil is disposed on the circuit member,
wherein the second coil comprises a first coil part, a second coil part disposed opposite to the first coil part, a third coil part, and a fourth coil part disposed opposite to the third coil part;
wherein the first magnet comprises a first magnet part facing the first coil part in an optical axis direction, a second magnet part facing the second coil part in the optical axis direction, a third magnet part facing the third coil part in the optical axis direction, and a fourth magnet part facing the fourth coil part in the optical axis direction;
wherein the second sensor comprises a first sensor part and a second sensor part,
wherein one end portion of the first magnet part is not overlapped with the first coil part and overlapped with the first sensor part in the optical axis direction,
wherein the other end portion of the first magnet part is overlapped with the first coil part in the optical axis direction, and
wherein both ends of the second magnet part are overlapped with the second coil part in the optical axis direction.

2. The lens moving apparatus according to claim 1 , wherein the first sensor part is adjacent to an end of the fourth coil part, and the second sensor part is closer to an end of the first coil part than to the second coil part.

3. The lens moving apparatus according to claim 1 , wherein a length of the second coil part is smaller than a length of the second magnet part.

4. The lens moving apparatus according to claim 1 , wherein a length of the first coil part is equal to or less than a length of the first magnet.

5. The lens moving apparatus according to claim 1 , wherein the circuit member comprises a hole formed at a corner portion of the circuit member adjacent to the first sensor part, and
the support member is connected to the hole of the circuit member.

6. The lens moving apparatus according to claim 1 , wherein a length of the first coil part is smaller than a length of the second coil part.

7. The lens moving apparatus according to claim 6 , wherein a lower surface of the third magnet part comprises one end portion of the third magnet part not overlapped with the third coil part in the optical axis direction, and
wherein the second sensor part is overlapped with the one end portion of the lower surface of the third magnet part in the optical axis direction.

8. The lens moving apparatus according to claim 7 , wherein a length of the third coil part is smaller than a length of the fourth coil part.

9. The lens moving apparatus according to claim 8 , wherein the first sensor part is configured to detect displacement of the housing with respect to the base in a X-axis direction, and the second sensor part is configured to detect displacement of the housing with respect to the base in a Y-axis direction.

10. The lens moving apparatus according to claim 7 , wherein the other end portion of the lower surface of the first magnet part is overlapped with the first coil part in the optical axis direction, and
wherein the other end portion of the lower surface of the third magnet part is overlapped with the third coil part in the optical axis direction.

11. The lens moving apparatus according to claim 10 , wherein the one end portion of the first magnet part is disposed outside the first coil part when viewed from the top, and the other end of the first magnet part is disposed within both ends of the first coil part.

12. The lens moving apparatus according to claim 11 , wherein both ends of the second magnet part are disposed within both ends of the second coil part when viewed from a top view.

13. The lens moving apparatus according to claim 11 , wherein the one end of the third magnet part is disposed outside the third coil part when viewed from the top, and the other end of the third magnet part is disposed within both ends of the third coil part, and
wherein both ends of the fourth magnet part are disposed within both ends of the fourth coil part when viewed from a top view.

14. The lens moving apparatus according to claim 1 , further comprising a first sensor for detecting displacement of the bobbin,
wherein the elastic member comprises an upper elastic member coupled to an upper surface of the housing and a lower elastic member coupled to a lower surface of the housing;
wherein the upper elastic member comprises first to fourth upper elastic members,
wherein the support member comprises first to fourth support members, and
wherein the first sensor is connected to the first to fourth support members via the first to fourth upper elastic members, respectively.

15. The lens moving apparatus according to claim 14 , wherein the lower elastic member comprises first and second lower elastic members, which are separated from each other, and
wherein the first coil is connected to the first and second lower elastic members.

16. The lens moving apparatus according to claim 14 , wherein the upper elastic member further comprises a fifth upper elastic member and a sixth upper elastic member, which are separated from each other,
wherein each of the fifth upper elastic member and the sixth upper elastic member is coupled to the housing and electrically connected to the first coil.

17. The lens moving apparatus according to claim 14 , further comprising a second magnet disposed to face the first sensor.

18. The lens moving apparatus according to claim 14 , further comprising a sensor substrate coupled to the bobbin,
wherein the first sensor is coupled to the sensor substrate, and
wherein the sensor substrate is disposed on the bobbin.

19. A lens moving apparatus comprising:
a base;
a substrate disposed on the base;
a bobbin disposed on the base;
a first coil disposed on the bobbin;
a first magnet facing the first coil;
a second coil facing the first magnet;
an elastic member coupled to the bobbin;
a wire connecting the elastic member and the substrate; and
a second sensor disposed on the substrate,
wherein the second coil and the second sensor are disposed on opposite sides of the substrate,
wherein the second coil comprises a first coil part, a second coil part disposed opposite to the first coil part, a third coil part, and a fourth coil part disposed opposite to the third coil part;
wherein the first magnet comprises a first magnet part facing the first coil part in an optical axis direction, a second magnet part facing the second coil part in the optical axis direction, a third magnet part facing the third coil part in the optical axis direction, and a fourth magnet part facing the fourth coil part in the optical axis direction;
wherein the second sensor comprises a first sensor part and a second sensor part,
wherein one end portion of the first magnet part is overlapped with the first sensor part in the optical axis direction, and the other end portion of the first magnet part is overlapped with one end of the first coil part in the optical axis direction, and
wherein both ends of the seco

Assignees

• Lg Innotek Co Ltd

Inventors

• Min Sang Jun
• Yoo Kyoung Ho
• Yoo Hyune O

Classifications

• G03B5/00 Primary

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

• G02B7/08

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

• G03B13/34

  Power focusing · CPC title

• G02B27/646 Primary

  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 title

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title