Lens driving unit, camera module and optical apparatus having a magnet

Patent metadata

Field	Value
Publication number	US-12189207-B2
Application number	US-202318313660-A
Country	US
Kind code	B2
Filing date	May 8, 2023
Priority date	Apr 29, 2015
Publication date	Jan 7, 2025
Grant date	Jan 7, 2025

Abstract

A lens driving device is provided, the lens driving device including: a housing; a bobbin disposed at an inner side of the housing; a first driving part disposed on the bobbin; a second driving part disposed on the housing and facing the first driving part; a first mounting part disposed on the bobbin; a second mounting part disposed on the bobbin and disposed at an opposite side of the first mounting part based on a center of the bobbin; a first magnet disposed on the first mounting part; a sensor part sensing a position of the first magnet; and a second magnet disposed on the second mounting part.

First claim

What is claimed is:

1. A lens driving device, 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 first magnet disposed on the bobbin;
a circuit board; and
a sensor disposed on the circuit board and facing the first magnet,
wherein the lateral plate of the cover member comprises first and second lateral plates opposite to each other and third and fourth lateral plates opposite to each other,
wherein the driving magnet comprises a first driving magnet disposed at a position corresponding to the first lateral plate, and a second driving magnet disposed at a position corresponding to the third lateral plate,
wherein each of the first driving magnet and the second driving magnet comprises an inner surface facing the coil,
wherein a horizontal width of the inner surface of the first driving magnet is shorter than a horizontal width of the inner surface of the second driving magnet, and
wherein the sensor is disposed at a position corresponding to the first lateral plate of the cover member.

2. The lens driving device of claim 1 , wherein the cover member comprises a first corner part disposed between the first lateral plate and the third lateral plate, a second corner part disposed between the second lateral plate and the third lateral plate, a third corner part disposed between the second lateral plate and the fourth lateral plate, and a fourth corner part disposed between the first lateral plate and the fourth lateral plate,
wherein the second driving magnet is disposed at a position nearer to the first corner part than to the second corner part, and
wherein the first driving magnet is disposed at a position nearer to the first corner part than to the fourth corner part.

3. The lens driving device of claim 2 , wherein the sensor is disposed at a position nearer to the fourth corner part than to the first corner part.

4. The lens driving device of claim 1 , wherein the horizontal width of the inner surface of the first driving magnet is a length of the first driving magnet in a direction from the third lateral plate of the cover member toward the fourth lateral plate of the cover member.

5. The lens driving device of claim 2 , wherein the driving magnet comprises a third driving magnet disposed at a position corresponding to the second lateral plate, and a fourth driving magnet disposed at a position corresponding to the fourth lateral plate, and
wherein a horizontal width of an inner surface of the third driving magnet is the same as the horizontal width of the inner surface of the first driving magnet.

6. The lens driving device of claim 5 , wherein the first driving magnet and the third driving magnet are symmetric with respect to an optical axis, and
wherein the second driving magnet and the fourth driving magnet are symmetric with respect to the optical axis.

7. The lens driving device of claim 1 , comprising an elastic member coupled to the bobbin,
wherein the elastic member comprises an upper elastic member and a lower elastic member disposed below the upper elastic member,
wherein the lower elastic member comprises two lower elastic members spaced apart from each other, and
wherein the coil is electrically connected with the two lower elastic members.

8. The lens driving device of claim 7 , wherein an electric power supplied from an external source through a terminal part of the circuit board is supplied to the coil through the two lower elastic members.

9. The lens driving device of claim 1 , comprising a second magnet disposed on the bobbin and disposed at a position symmetrical to the first magnet with respect to an optical axis.

10. The lens driving device of claim 1 , wherein the first magnet is overlapped with the coil in a first direction perpendicular to an optical axis.

11. The lens driving device of claim 10 , wherein the first magnet is disposed between the coil and the bobbin in the first direction, and
wherein the coil is disposed between the first magnet and the sensor in the first direction.

12. The lens driving device of claim 1 , wherein the bobbin comprises a driving part coupling part formed by being recessed from an outer peripheral surface of the bobbin, and a first mounting part formed by being recessed more than a driving part coupling part from the outer peripheral surface of the bobbin,
wherein the coil is disposed on the driving part coupling part of the bobbin, and
wherein the sensor is disposed on the first mounting part of the bobbin.

13. The lens driving device of claim 1 , wherein a height of the first driving magnet is the same as a height of the second driving magnet, and
wherein a thickness of the first driving magnet is the same as a thickness of the second driving magnet.

14. The lens driving device of claim 1 , wherein the circuit board comprises six terminals disposed on an outer surface of the circuit board.

15. The lens driving device of claim 1 , wherein the driving magnet comprises a third driving magnet disposed at a position corresponding to the second lateral plate, and
wherein the first driving magnet is not overlapped with the third driving magnet in a direction from the first lateral plate to the second lateral plate.

16. A camera module, comprising:
a printed circuit board;
an image sensor disposed on the printed circuit board;
the lens driving device of claim 1 ; and
a lens coupled to the bobbin of the lens driving device and disposed at a position corresponding to the image sensor.

17. A mobile phone comprising the camera module of claim 16 .

18. A lens driving device, 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 first magnet disposed on the bobbin;
a circuit board; and
a sensor disposed on the circuit board and facing the first magnet,
wherein the lateral plate of the cover member comprises first and second lateral plates opposite to each other and third and fourth lateral plates opposite to each other,
wherein the driving magnet comprises a first driving magnet disposed at a position corresponding to the first lateral plate, and a second driving magnet disposed at a position corresponding to the third lateral plate,
wherein each of the first driving magnet and the second driving magnet comprises an inner surface facing the coil,
wherein a horizontal width of the inner surface of the first driving magnet is shorter than a horizontal width of the inner surface of the second driving magnet, and
wherein the first magnet is disposed at a position corresponding to the first lateral plate of the cover member.

19. The lens driving device of claim 18 , wherein the cover member comprises a first corner part disposed between the first lateral plate and the third lateral plate, a second corner part disposed between the second lateral plate and the third lateral plate, a third corner part disposed between the second lateral plate and the fourth lateral plate, and a fourth corner part disposed between the first lateral plate and the fourth lateral plate,
wherein the second driving magnet is disposed at a position nearer to the first corner part than to the second corner part, and
wherein the first driving magn

Assignees

• Lg Innotek Co Ltd

Inventors

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

Classifications

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B27/646

  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 title

• G01D5/145

  influenced by the relative movement between the Hall device and magnetic fields (see G01R33/06) · CPC title

• G03B30/00

  Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles · CPC title