Lens moving apparatus

Patent metadata

Field	Value
Publication number	US-9857555-B2
Application number	US-201514694004-A
Country	US
Kind code	B2
Filing date	Apr 23, 2015
Priority date	Apr 24, 2014
Publication date	Jan 2, 2018
Grant date	Jan 2, 2018

Abstract

Embodiments provide a lens moving apparatus including a housing supporting a driving magnet and having an opening, a bobbin provided at an outer circumferential surface thereof with a coil located inside the driving magnet, the bobbin being moved in a first direction parallel to an optical axis within the housing via electromagnetic interaction between the driving magnet and the coil, and a damper located between the housing and the bobbin.

First claim

What is claimed is:

1. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing and configured to move in a direction of an optical axis;
a coil disposed at an outer circumferential surface of the bobbin;
a magnet disposed on the housing and facing the coil; and
a damper provided between the housing and the bobbin,
wherein the bobbin includes a protrusion protruding in a direction perpendicular to the optical axis, and the housing includes a recess facing the protrusion,
wherein the damper is disposed on the protrusion and the recess,
wherein the damper is overlapped with the protrusion and the recess in the direction perpendicular to the optical axis, and
wherein the recess has a shape in which an upper side is opened so that the movement of the bobbin in an upward direction is not limited.

2. The lens moving apparatus according to claim 1 , wherein the protrusion protrudes from the outer circumferential surface of the bobbin in the direction perpendicular to the optical axis and the recess is recessed in the direction perpendicular to the optical axis.

3. The lens moving apparatus according to claim 2 , wherein the protrusion is spaced apart from the recess, and the damper is disposed in a space between the protrusion and the recess.

4. The lens moving apparatus according to claim 2 , wherein the damper is provided in a gel state.

5. The lens moving apparatus according to claim 2 , wherein the damper is disposed to allow the bobbin to move in the direction of the optical axis with respect to the housing.

6. The lens moving apparatus according to claim 2 , wherein the damper comes into contact with the protrusion and is attached to the housing.

7. The lens moving apparatus according to claim 2 , wherein the damper includes a plurality of dampers and each of the plurality of dampers is disposed at each corner of the housing.

8. The lens moving apparatus according to claim 7 , wherein the plurality of dampers are provided in four in total, and are disposed at four corners of the housing, respectively.

9. The lens moving apparatus according to claim 7 , wherein the dampers are spaced apart from each other at an equal angle in a circumferential direction of the bobbin.

10. The lens moving apparatus according to claim 7 , wherein the housing includes a facing surface facing one surface of the bobbin between the corners of the housing, and
wherein the magnet is disposed on the facing surface of the housing.

11. The lens moving apparatus according to claim 1 , wherein the protrusion is provided on an upper portion of the bobbin, and the recess is provided on an upper portion of the housing.

12. The lens moving apparatus according to claim 11 , wherein the protrusion is disposed below the upper side of the housing.

13. The lens moving apparatus according to claim 1 , wherein the recess further comprises a stepped portion.

14. The lens moving apparatus according to claim 13 , wherein the protrusion is overlapped with the stepped portion of the recess in the direction of the optical axis.

15. The lens moving apparatus according to claim 1 , wherein the protrusion is provided on a lower portion of the bobbin, and the recess is provided on a lower portion of the housing.

16. The lens moving apparatus according to claim 1 , wherein the protrusion is provided at a middle height between an upper portion and a lower portion of the bobbin, and the recess is provided at a middle height between an upper portion and a lower portion of the housing.

17. The lens moving apparatus according to claim 1 , further comprising a displacement sensing unit in order to sense a displacement of the bobbin in the direction of the optical axis.

18. The lens moving apparatus according to claim 17 , wherein the displacement sensing unit is disposed above the coil.

19. The lens moving apparatus according to claim 17 , further comprising a base disposed under the magnet, and a cover member coupled to the base, and
wherein the displacement sensing unit includes a position sensor and a sensing magnet disposed to face each other between the cover member and the bobbin.

20. The lens moving apparatus according to claim 19 , wherein the position sensor is disposed on the housing, and the sensing magnet is disposed on the bobbin.

21. The lens moving apparatus according to claim 19 , wherein the sensing magnet is not overlapped with the coil in the direction perpendicular to the optical axis.

22. The lens moving apparatus according to claim 21 , further comprising a printed circuit board electrically connected to the position sensor, the printed circuit board including a plurality of terminals, and
wherein the cover member includes a recess formed on a surface corresponding to the plurality of terminals of the printed circuit board.

23. The lens moving apparatus according to claim 22 , wherein an adhesive is injected inside the recess of the cover member so that the cover member and the printed circuit board are bonded each other.

24. The lens moving apparatus according to claim 22 , wherein the base includes a stepped portion on which the cover member is disposed, and the stepped portion of the base and the cover member are adhered and fixed.

25. The lens moving apparatus according to claim 21 , further comprising an upper elastic member disposed on an upper portion of the housing and a lower elastic member disposed on a lower portion of the housing,
wherein the housing includes an upper frame support boss protruding from an upper surface of the housing and a lower frame support boss protruding from a lower surface of the housing,
wherein the upper elastic member includes a through-hole or recess coupled with the upper frame support boss, and the lower elastic member includes a through-hole or recess coupled with the lower frame support boss, and
wherein the upper elastic member and the lower elastic member are fixed each other using an adhesive or via fusion.

26. The lens moving apparatus according to claim 25 , wherein the upper elastic member is electrically connected to the coil.

27. The lens moving apparatus according to claim 26 , wherein the housing further includes a plurality of stoppers protruding from the upper surface of the housing to prevent the upper surface of the housing from contacting the cover member.

28. The lens moving apparatus according to claim 26 , wherein the coil has an octagonal shape and a surface of the coil facing the magnet is flat.

29. The lens moving apparatus according to claim 19 , wherein the position sensor is a hall sensor.

30. The lens moving apparatus according to claim 19 , wherein the position sensor is overlapped with at least a portion of the coil in the direction perpendicular to the optical axis.

31. A camera module comprising:
the lens moving apparatus according to claim 19 ;
a lens barrel coupled to the bobbin of the lens moving apparatus; and
an image sensor.

32. A phone comprising the camera module according to claim 31 and a controller configured to adjust an amount of current of the coil based on a value sensed by the displacement sensing unit of the lens moving apparatus.

33. The phone according to claim 32 , wherein the position sensor of the lens moving apparatus senses variation in magnetic force em

Assignees

• Lg Innotek Co Ltd

Inventors

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

Classifications

• G03B2205/0069

  using electromagnetic actuators, e.g. voice coils · 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

• G03B3/10

  Power-operated focusing · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title

• G02B7/08 Primary

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