Lens driving device, camera module and optical device

Patent metadata

Field	Value
Publication number	US-12353118-B2
Application number	US-202118007511-A
Country	US
Kind code	B2
Filing date	Jun 1, 2021
Priority date	Jul 13, 2020
Publication date	Jul 8, 2025
Grant date	Jul 8, 2025

Abstract

The present embodiment relates to a lens driving device comprising: a fixed portion; a moving portion; a bobbin; a magnet disposed on any one of the bobbin and fixed portion; a coil disposed on the other one of the bobbin and fixed portion; a support member having one end coupled to the bobbin and the other end coupled to the moving portion; and a shape memory alloy member coupled to the fixed portion and moving portion, wherein the shape memory alloy member moves the moving portion in an optical axis direction, and the coil and magnet move the bobbin about the moving portion in a direction perpendicular to the optical axis direction.

First claim

The invention claimed is:

1. A lens driving device comprising:
a fixed portion;
a moving portion disposed to move with respect to the fixed portion;
a bobbin disposed in the moving portion;
a magnet disposed on any one of the bobbin and the fixed portion;
a coil disposed on the other one of the bobbin and the fixed portion;
a support member comprising one end coupled with the bobbin and the other end coupled with the moving portion; and
a shape memory alloy member coupled to the fixed portion and the moving portion,
where in the shape memory alloy member is configured to move the moving portion in an optical axis direction, and
wherein the coil and the magnet are configured to move the bobbin with respect to the moving portion in a direction perpendicular to the optical axis direction.

2. The lens driving device of claim 1 , wherein both ends of the shape memory alloy member are connected with the fixed portion, and a central region of the shape memory alloy member is connected with the moving portion.

3. The lens driving device of claim 1 , wherein the support member has regions having different widths.

4. The lens driving device of claim 1 , wherein the support member has a constant width in a lengthwise direction.

5. The lens driving device of claim 1 , wherein a width of a peripheral region of the support member is thicker than a width of a central region of the support member.

6. The lens driving device of claim 1 , wherein the support member has a head portion and a body portion, and
wherein a width of the head portion is greater than a width of the body portion.

7. The lens driving device of claim 1 , wherein the shape memory alloy member comprises a first unit shape memory alloy member and a second unit shape memory alloy member.

8. The lens driving device of claim 7 , wherein the magnet comprises a first unit magnet and a second unit magnet.

9. The lens driving device of claim 8 , wherein the moving portion comprises a first corner region connected with the first unit shape memory alloy member and a second corner region adjacent to the first corner region, and
wherein the first unit magnet is disposed closer to the second corner region than to the first corner region.

10. The lens driving device of claim 9 , wherein the moving portion comprises a third corner region in a diagonal direction from the first corner region,
wherein the second unit shape memory alloy member is connected with the third corner region of the moving portion, and
wherein the second unit magnet is disposed closer to the second corner region than to the third corner region.

11. The lens driving device of claim 1 , wherein the support member is disposed in the optical axis direction.

12. The lens driving device of claim 1 , wherein the bobbin is configured to move together with the moving portion when the moving portion moves in the optical axis direction.

13. The lens driving device of claim 1 , wherein the support member comprises a body portion, and a first concave portion and a second concave portion formed to have a narrower width than the body portion,
wherein the first concave portion of the support member is coupled with the bobbin, and
wherein the second concave portion of the support member is coupled with the moving portion.

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

15. An optical device comprising:
a main body;
the camera module of claim 14 disposed on the main body; and
a display disposed on the main body and outputting an image photographed by the camera module.

16. A lens driving device comprising:
a fixed portion;
a moving portion disposed in the fixed portion;
a bobbin disposed in the moving portion;
a shape memory alloy member configured to move the moving portion in an optical axis direction;
a coil and a magnet configured to move the bobbin with respect to the moving portion in a direction perpendicular to the optical axis direction; and
a support member connecting the bobbin and the moving portion.

17. The lens driving device of claim 16 , wherein both ends of the shape memory alloy member are connected with the fixed portion, and
wherein a central region of the shape memory alloy member is connected with the moving portion.

18. The lens driving device of claim 16 , wherein the support member has regions having different widths.

19. The lens driving device of claim 16 , wherein the support member comprises a body portion, and a first concave portion and a second concave portion formed to have a narrower width than the body portion,
wherein the first concave portion of the support member is coupled with the bobbin, and
wherein the second concave portion of the support member is coupled with the moving portion.

20. A lens driving device comprising:
a fixed portion;
a moving portion moving with respect to the fixed portion in an optical axis direction;
a bobbin disposed in the moving portion;
a driving unit configured to move the bobbin in a direction perpendicular to the optical axis direction;
a support member coupled with the bobbin and the moving portion; and
a shape memory alloy member coupled with the fixed portion and the moving portion,
wherein the support member comprises regions having different widths.

Assignees

• Lg Innotek Co Ltd

Inventors

• Son Byung Wook
• Yoo Kyoung Ho

Classifications

• H02K41/0354

  Lorentz force motors, e.g. voice coil motors · CPC title

• G03B2205/0069

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

• G03B2205/0015

  by displacing one or more optical elements normal to the optical axis · CPC title

• H04N23/55

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

• H04N23/54 Primary

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title