Lens driving unit, camera module and optical apparatus

Patent metadata

Field	Value
Publication number	US-10520700-B2
Application number	US-201615142610-A
Country	US
Kind code	B2
Filing date	Apr 29, 2016
Priority date	Apr 29, 2015
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

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, the lens driving device comprising:
a housing, wherein the housing comprises first and second lateral walls opposite to each other and third and fourth lateral walls disposed between the first and second lateral walls and being opposite to each other;
a bobbin disposed in the housing;
a coil disposed on the bobbin;
a first driving magnet facing the coil and disposed on the first lateral wall of the housing;
a second driving magnet facing the coil and disposed on the third lateral wall of the housing,
an elastic member coupled to the bobbin;
a first magnet disposed on the bobbin; and
a hall sensor facing the first magnet and disposed on the first lateral wall of the housing,
wherein the first driving magnet comprises an inner surface facing the coil,
wherein 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,
wherein the housing comprises a first corner part connecting the first lateral wall and the third lateral wall, a second corner part connecting the second lateral wall and the third lateral wall, a third corner part connecting the second lateral wall and the fourth lateral wall, and a fourth corner part connecting the first lateral wall and the fourth lateral wall,
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.

2. 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,
wherein a thickness of the first driving magnet is the same as a thickness of the second driving magnet,
wherein the thickness of the first driving magnet is a length of the first driving magnet in a direction perpendicular to an optical axis, and
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 wall of the housing toward the fourth lateral wall of the housing.

3. The lens driving device of claim 2 , wherein the hall 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 , comprising a third driving magnet disposed on, and in direct contact with, the second lateral wall of the housing and a fourth driving magnet disposed on, and direct contact with, the fourth lateral wall of the housing,
wherein the first driving magnet is in direct contact with the first lateral wall of the housing, and the second driving magnet is in direct contact with the third lateral wall of the housing, 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.

5. The lens driving device of claim 4 , wherein the first driving magnet and the third driving magnet are symmetric with respect to an optical axis,
wherein the second driving magnet and the fourth driving magnet are symmetric with respect to the optical axis,
wherein the third driving magnet is disposed at a position nearer to the third corner part than to the second corner part, and
wherein the fourth driving magnet is disposed at a position nearer to the third corner part than to the fourth corner part.

6. The lens driving device of claim 1 , comprising:
a cover member covering the housing and comprising an upper plate and a lateral plate extending from the upper plate;
a base disposed below the bobbin and coupled with the lateral plate of the cover member; and
a circuit board disposed between a lateral surface of the base and the lateral plate of the cover member,
wherein the hall sensor is coupled to an inner surface of the circuit board,
wherein the elastic member comprises a lower elastic member comprising an inner part coupled to a lower portion of the bobbin, an outer part disposed between the housing and the base, and a connecting part connecting the inner part and the outer part,
wherein the lower elastic member comprises two lower elastic units spaced apart from each other,
wherein the coil is electrically connected to the circuit board by the two lower elastic units, and
wherein at least a portion of the circuit board is disposed between the housing and the lateral plate of the cover member.

7. The lens driving device of claim 6 , comprising a second magnet disposed on, and direct physical contact with, the bobbin and spaced apart from the first magnet,
wherein the first magnet and the second magnet are symmetric with respect to an optical axis.

8. The lens driving device of claim 6 , wherein the cover member comprises an inner yoke extending from an inner periphery of the upper plate,
wherein the bobbin comprises an upper groove formed on an upper surface of the bobbin and disposed at a position corresponding to that of the inner yoke, and
wherein at least a portion of the inner yoke is disposed in the upper groove of the bobbin.

9. The lens driving device of claim 6 , wherein the circuit board comprises six terminals disposed on a lower end portion of an outer surface of the circuit board.

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,
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 hall sensor in the first direction.

11. The lens driving device of claim 1 , wherein the bobbin comprises a first groove having a shape corresponding to that of the first magnet, and
wherein the first magnet is disposed in the first groove of the bobbin.

12. The lens driving device of claim 1 , wherein the bobbin comprises a first lateral surface facing the first lateral wall of the housing, a second lateral surface facing the second lateral wall of the housing, a third lateral surface facing the third lateral wall of the housing, a fourth lateral surface facing the fourth lateral wall of the housing, a first corner surface disposed between the first lateral surface of the bobbin and the third lateral surface of the bobbin, and a second corner surface disposed between the second lateral surface of the bobbin and the fourth lateral surface of the bobbin,
wherein the first magnet is disposed on, and in direct physical contact with, the first lateral surface of the bobbin,
wherein a horizontal center of the first magnet is nearer to the first corner surface of the bobbin than it is to a center of the first lateral surface of the bobbin,
wherein the lens driving device comprises a second magnet spaced apart from the first magnet and disposed on, and direct physical contact with, the second lateral surface of the bobbin,
wherein the first magnet and the second magnet are symmetric with respect to an optical axis,
wherein a horizontal center of the second magnet is nearer to the second corner surface of the bobbin than it is to a center of the second lateral surface of the bobbin, and
wherein the third lateral surface of the bobbin and the fourth lateral surface of the bobbin are free from any first magnet being disposed thereon.

13. The lens driving device of claim 12 , comprising a third driving magnet disposed on, and in direct contact with, the second lateral wall of the housing and a fourth driving magnet d

Assignees

• Lg Innotek Co Ltd

Inventors

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

Classifications

• 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

• H04N23/55

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

• H04N23/57

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

• G03B13/36

  Autofocus systems · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title