Voice Coil Motor

Patent metadata

Field	Value
Publication number	US-2017288525-A1
Application number	US-201715630721-A
Country	US
Kind code	A1
Filing date	Jun 22, 2017
Priority date	Jul 19, 2010
Publication date	Oct 5, 2017
Grant date	—

Abstract

Disclosed is a voice coil motor, the motor including a mover having a bobbin equipped with a lens and a coil block secured to an outer circumference of the bobbin; a stator having a magnet that is disposed in such a way as to face the coil block; elastic members coupled to a lower end of the bobbin and connected to both ends of the coil block; a base supporting the elastic members and the stator; and a cover can covering the mover, the stator and the base, with an opening being formed in the cover can to expose the lens therethrough, wherein each of the elastic members includes a terminal portion that extends between the cover can and a side surface of the base, the terminal portion including a short-circuit prevention portion so as to inhibit a short-circuit between the terminal portion and the cover can.

First claim

What is claimed is:

1 . A voice coil motor (VCM), comprising:
a cover can of metal material, the cover can comprising a top plate comprising a hole, and a side plate extending from the top plate; a bobbin disposed in the cover can; a coil disposed on an outer periphery of the bobbin; a magnet disposed between the bobbin and the side plate of the cover can and facing the coil; a base disposed below the bobbin and coupled with the side plate of the cover can; and a first elastic member coupled with a lower surface of the bobbin and an upper surface of the base and comprising two elastic members spaced apart from each other and electrically connected to the coil, a terminal comprising two terminal parts electrically connected to the two elastic members, respectively, wherein the side plate of the cover can comprises a recess disposed at a position corresponding to that of the terminal, wherein the cover can is overlapped with at least a portion of the terminal in a horizontal direction, wherein the terminal is spaced apart from an inner surface of the side plate of the cover can in the horizontal direction, wherein an insulation member is disposed between the inner surface of the side plate of the cover can and the terminal in the horizontal direction, and wherein the insulation member is overlapped with the recess of the side plate of the cover can and the terminal in the horizontal direction.

2 . The VCM of claim 1 , wherein a portion of a lower end of the side plate of the cover can is disposed lower than the first elastic member.

3 . The VCM of claim 1 , wherein the first elastic member is spaced apart from the side plate of the cover can, and
wherein the first elastic member comprises an inner elastic unit coupled to the lower surface of the bobbin and an outer elastic unit coupled to the upper surface of the base, and a connection elastic unit connecting the inner elastic unit and the outer elastic unit.

4 . The VCM of claim 1 , wherein the base comprises two grooves disposed on an outer lateral surface of the base and spaced apart from each other, and
wherein the two terminal parts are fixed to the two grooves, respectively, by an adhesive.

5 . The VCM of claim 4 , wherein the two grooves comprise a first groove and a second groove spaced apart from each other,
wherein the two terminal parts comprise a first terminal part disposed on the first groove and a second terminal part disposed on the second groove, and wherein the two elastic members comprise a first elastic member unit coupled with the first terminal part and a second elastic member unit coupled with the second terminal part.

6 . The VCM of claim 5 , wherein the first terminal part is integrally formed with the first elastic member unit, and the second terminal part is integrally formed with the second elastic member unit.

7 . The VCM of claim 1 , wherein at least a portion of each of the two terminal parts is exposed outside the side plate of the cover can through the recess of the side plate of the cover can.

8 . The VCM of claim 1 , wherein the insulation member disposed on the recess of the side plate of the cover can.

9 . The VCM of claim 1 , wherein the recess of the side plate of the cover can is a cutout portion of the side plate of the cover can.

10 . The VCM of claim 4 , wherein the two grooves of the base is inwardly recessed from a step part of the base, and wherein a lower end of the side plate of the cover can is disposed on the step part of the base.

11 . The VCM of claim 10 , wherein the two terminal parts are downwardly protruded from the base.

12 . The VCM of claim 1 , wherein the cover can is configured to be electrically connected to a ground portion.

13 . The VCM of claim 1 , wherein the two terminal parts are disposed within a boundary of the cover can when viewed from the top.

14 . The VCM of claim 1 , further comprising a second elastic member coupled with an upper surface of the bobbin and supporting the bobbin,
wherein the second elastic member is disposed in the cover can, and wherein the magnet is disposed at a corner of the cover can.

15 . The VCM of claim 1 , wherein the coil is disposed on a step part formed on the outer periphery of the bobbin.

16 . The VCM of claim 6 , wherein each of the two terminal parts comprises a first portion disposed on the base and connected to the first elastic member and a second portion extending downwardly from the first portion, and the second portion of each of the two terminal parts is fixed to each of the two grooves.

17 . The VCM of claim 16 , wherein the second portion of each of the two terminal parts extends between each of the two grooves and the inner surface of the side plate of the cover can, and
wherein the insulation member is overlapped with the cover can and the second portion of each of the two terminal parts in the horizontal direction.

18 . The VCM of claim 17 , wherein the second portion of each of the two terminal parts is extending along each of the two grooves.

19 . A camera module, comprising:
a printed circuit board (PCB); an image sensor disposed on the printed circuit board; the VCM of claim 1 ; and a lens coupled with the bobbin of the VCM of claim 1 and disposed over the image sensor.

20 . A mobile phone, comprising the camera module of claim 19 .

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Sanghee

Classifications

• H04N23/54

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

• H02K41/0356 Primary

  moving along a straight path · CPC title

• G03B3/10

  Power-operated focusing · CPC title

• H02K33/04

  wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation · CPC title

• H02K41/0354

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