Lens moving apparatus

Patent metadata

Field	Value
Publication number	US-12292617-B2
Application number	US-202318529950-A
Country	US
Kind code	B2
Filing date	Dec 5, 2023
Priority date	Dec 23, 2013
Publication date	May 6, 2025
Grant date	May 6, 2025

Abstract

The present embodiment relates to a lens driving device, and more particularly, to a lens driving device capable of reducing a focus alignment time of a lens by feeding back an amount of displacement in an optical axis direction of a lens while improving spatial efficiency of a bobbin.
Specifically, the present embodiment includes a housing having a hollow column shape for supporting a driving magnet; At least one lens is installed inside, the outer peripheral surface is provided with a coil disposed inside the driving magnet, parallel to the optical axis inside the housing by electromagnetic interaction between the driving magnet and the coil a bobbin moving in a first direction; It relates to a lens driving device comprising a; displacement sensing unit for determining a first displacement value of the bobbin in the first direction.

First claim

What is claimed is:

1. A lens moving apparatus, comprising:
a cover member comprising an upper plate and a lateral plate extending from the upper plate;
a bobbin disposed in the cover member;
a coil disposed on the bobbin;
a driving magnet disposed between the coil and the lateral plate of the cover member;
a sensing magnet disposed on the bobbin;
a circuit board disposed on the lateral plate of the cover member; and
a position sensor disposed on the circuit board and configured to sense the sensing magnet,
wherein the coil and the driving magnet are configured to move the bobbin in an optical axis direction,
wherein a part of the coil is disposed between the sensing magnet and the circuit board in a first direction perpendicular to the optical axis direction,
wherein the circuit board comprises a terminal part, and
wherein the cover member comprises a groove formed on a lower end of the lateral plate so that the terminal part of the circuit board is exposed outside.

2. The lens moving apparatus of claim 1 , wherein the sensing magnet is overlapped with the position sensor in the first direction.

3. The lens moving apparatus of claim 1 , wherein the part of the coil is overlapped with the sensing magnet and the circuit board in the first direction.

4. The lens moving apparatus of claim 1 , wherein the part of the coil is disposed between the sensing magnet and the position sensor in the first direction.

5. The lens moving apparatus of claim 1 , wherein the part of the coil is disposed between the sensing magnet and the lateral plate of the cover member in the first direction.

6. The lens moving apparatus of claim 1 , wherein the driving magnet is overlapped with the coil in a second direction perpendicular to the optical axis direction and different from the first direction.

7. The lens moving apparatus of claim 1 , wherein the bobbin comprises a recess on an outer surface of the bobbin, and
wherein at least a part of the sensing magnet is disposed in the recess of the bobbin.

8. The lens moving apparatus of claim 7 , wherein the recess of the bobbin comprises an opening in the optical axis direction, and
wherein the sensing magnet is disposed between the bobbin and the coil.

9. The lens moving apparatus of claim 7 , wherein the bobbin comprises an additional recess on the outer surface of the bobbin at a position opposite to the recess.

10. The lens moving apparatus of claim 9 , comprising a weight balance member disposed in the additional recess.

11. The lens moving apparatus of claim 1 , comprising a housing disposed between the cover member and the bobbin,
wherein at least a part of the circuit board is disposed between the housing and the lateral plate of the cover member.

12. The lens moving apparatus of claim 11 , comprising a base coupled with the lateral plate of the cover member,
wherein the terminal part of the circuit board is disposed on the base.

13. The lens moving apparatus of claim 1 , wherein the sensing magnet is not overlapped with the driving magnet in the first direction.

14. The lens moving apparatus of claim 7 , wherein an adhesive is disposed in the recess of the bobbin.

15. A camera apparatus, comprising:
a printed circuit board;
an image sensor disposed on the printed circuit board;
the lens moving apparatus of claim 1 ; and
a lens coupled to the bobbin of the lens moving apparatus.

16. A smartphone comprising the camera apparatus of claim 15 .

17. A lens moving apparatus, comprising:
a base;
a cover member comprising a lateral plate disposed on the base;
a bobbin disposed on the base;
a coil disposed on the bobbin;
a driving magnet facing the coil;
a sensing magnet disposed on the bobbin;
a circuit board comprising a terminal part disposed on the base; and
a position sensor disposed on the circuit board and configured to sense the sensing magnet,
wherein the coil and the driving magnet are configured to move the bobbin in an optical axis direction,
wherein a part of the coil is disposed between the sensing magnet and the circuit board in a first direction perpendicular to the optical axis direction, and
wherein the cover member comprises a groove formed on a lower end of the lateral plate so that the terminal part of the circuit board is exposed outside.

18. The lens moving apparatus of claim 17 , wherein the bobbin comprises a recess on an outer surface of the bobbin,
wherein at least a part of the sensing magnet is disposed in the recess of the bobbin, and
wherein an adhesive is disposed in the recess of the bobbin.

19. The lens moving apparatus of claim 7 , wherein the sensing magnet does not protrude from the outer surface of the bobbin.

20. The lens moving apparatus of claim 18 , wherein the sensing magnet does not protrude from the outer surface of the bobbin.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Seong Min
• Park Sang Ok
• Yoo Hyune O
• Son Byung Wook
• Lee Jun Taek

Classifications

• G03B3/10

  Power-operated focusing · CPC title

• H02K11/215

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

• H02K41/0356 Primary

  moving along a straight path · CPC title

• G03B13/36

  Autofocus systems · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title