Lens driving device, camera module, and optical device

Patent metadata

Field	Value
Publication number	US-2019041602-A1
Application number	US-201716068609-A
Country	US
Kind code	A1
Filing date	Jan 11, 2017
Priority date	Jan 11, 2016
Publication date	Feb 7, 2019
Grant date	—

Abstract

The present embodiment relates to a lens driving device comprising: a housing; a bobbin disposed inside the housing; a coil disposed at the bobbin; a magnet disposed in the housing and facing the coil; an elastic member coupled to the housing and the bobbin; and a damper disposed at the elastic member, wherein the elastic member comprises an outer part coupled to the housing, an inner part coupled to the bobbin, and a connection part for connecting the outer part and the inner part; and the damper is disposed at the connection part.

First claim

1 . A lens driving device comprising:
a housing; a bobbin disposed in the housing; a coil disposed on the bobbin; a magnet disposed on the housing and facing the coil; an elastic member coupled to the housing and the bobbin; and a damper disposed on the elastic member, wherein the elastic member comprises an outer part coupled to the housing, an inner part coupled to the bobbin, and a connection part for connecting the outer part and the inner part, and wherein the damper is disposed on the connection part.

2 . The lens driving device of claim 1 , wherein the elastic member comprises an upper elastic member disposed on an upper surface of the bobbin and coupled to the bobbin and the housing, and a lower elastic member disposed on a lower surface of the bobbin and coupled to the bobbin and the housing, and
wherein the damper is disposed on the lower elastic member.

3 . The lens driving device of claim 1 , wherein the damper comprises a first damper integrally coated on the connection part and the inner part.

4 . The lens driving device of claim 3 , wherein the connection part comprises an outer extension part extending from the outer part, an inner extension part extending from the inner part, and a connecting extension part connecting the outer extension part and the inner extension part,
wherein the connecting extension part comprises a first extension part and a second extension part slantly extending from the first extension part, wherein the inner part comprises first and second coupling parts coupled to the bobbin and spaced apart from each other, a body part connecting the first and second coupling parts, and a protrusion part outwardly extending from the body part and at least a portion of the protrusion part being disposed between the first extension part and the second extension part, and wherein the damper is integrally coated on the connecting extension part and the protrusion part.

5 . The lens driving device of claim 4 , wherein the connecting extension part comprises a third extension part slantly extending from the second extension part, and a fourth extension part slantly extending from the third extension part, and
wherein each of the first to fourth extension parts is roundly formed at least on a partial portion thereof.

6 . The lens driving device of claim 4 , wherein the first damper is coated on at least any one of a first position integrally coated on the first extension part and the protrusion part, and a second position integrally coated on the second extension part and the protrusion part.

7 . The lens driving device of claim 4 , wherein the first damper is coated on at least any one of a third position integrally coated on the outer extension part and the body part, a fourth position integrally coated on the inner extension part and the protrusion part, and a fifth position integrally coated on the connecting extension part and the body part.

8 . The lens driving device of claim 1 , wherein the damper comprises a second damper integrally coated on the connection part and the outer part.

9 . The lens driving device of claim 8 , wherein the second damper is coated on a plurality of positions spaced apart from each other.

10 . The lens driving device of claim 1 , wherein the connection part comprises an outer extension part extending from the outer part, an inner extension part extending from the inner part and a connecting extension part connecting the outer extension part and the inner extension part,
wherein the connecting extension part comprises a first extension part and a second extension part slantly extending from the first extension part, and wherein the damper comprises a third damper integrally coated on the first extension part and the second extension part.

11 . The lens driving device of claim 1 , further comprising:
a sensing magnet disposed at one side of the bobbin; and a sensor disposed on the housing and facing the sensing magnet, wherein the sensor is disposed at a corner part of the housing.

12 . The lens driving device of claim 11 , wherein the magnet is disposed at a lateral part of the housing, and
wherein the magnet is lopsidedly disposed to one side of corner part between both sides of the corner part of the housing.

13 . The lens driving device of claim 11 , further comprising a compensating magnet disposed at an other side of the bobbin and having a shape and a magnetism corresponding to those of the sensing magnet.

14 . The lens driving device of claim 11 , further comprising:
a substrate disposed with the sensor; and a substrate reception part formed on an outer lateral surface of the housing and accommodating at least a portion of the substrate.

15 . The lens driving device of claim 14 , wherein the substrate comprises a body part accommodated into the substrate reception part, a terminal part extending downwardly from the body part, and an extension part bent from the body part to be extended inward of the corner part of the housing and mounted with the sensor, and
wherein the body part is not horizontally overlapped with the magnet.

16 . The lens driving device of claim 11 , wherein the housing comprises a first lateral part and a third lateral part, each formed at an opposite side, a second lateral part and a fourth lateral part formed between the first lateral part and the third lateral part, each formed at an opposite side and first to fourth corner parts interposed between the first to fourth lateral parts, respectively,
wherein the magnet comprises a first magnet unit disposed at the first lateral part, a second magnet unit disposed at the second lateral part, a third magnet unit disposed at the third lateral part, and a fourth magnet unit disposed at the fourth lateral part, wherein the sensor is disposed at the first corner part, a center of the first magnet unit is disposed closer to the fourth corner part than the first corner part, a center of the second magnet unit is disposed closer to the second corner part than the first corner part, a center of the third magnet unit is disposed closer to the second corner part than the third corner part, and a center of the fourth magnet unit is disposed closer to the fourth corner part than the third corner part.

17 . The lens driving device of claim 2 , wherein the lower elastic member comprises a first lower elastic unit electrically connected to a distal end of one side of the coil, and a second lower elastic unit spaced apart from the first lower elastic unit and electrically connected to the other distal end of the coil.

18 . The lens driving device of claim 17 , further comprising a substrate mounted with the sensor,
wherein the first and second lower elastic units are electrically connected to the substrate.

19 . A camera module, comprising:
a PCB (Printed Circuit Board); an image sensor disposed on the PCB; the lens driving device of claim 1 disposed on the PCB; and a lens coupled to the bobbin of the lens driving device.

20 . An optical device, comprising a main body, the camera module of the claim 19 disposed on the main body to photograph an image of a subject, and a display part disposed on the main body to output the image photographed by the camera module.

Assignees

• Lg Innotek Co Ltd

Inventors

• Lee Kap Jin
• Kim Kyung Hwan

Classifications

• G02B7/02 Primary

  for lenses {(supports for magnifying lenses G02B25/002)} · CPC title

• G03B5/00

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G03B3/10

  Power-operated focusing · CPC title

• G03B13/36

  Autofocus systems · CPC title

• G03B2205/0069

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