Lens Moving Device, Camera Module and Optical Apparatus

Patent metadata

Field	Value
Publication number	US-2015362696-A1
Application number	US-201514729475-A
Country	US
Kind code	A1
Filing date	Jun 3, 2015
Priority date	Jun 11, 2014
Publication date	Dec 17, 2015
Grant date	—

Abstract

A lens moving device is provided. The lens moving device includes: a bobbin; a first driving unit coupled to the bobbin; a second driving unit configured to move the first driving unit through an electromagnetic interaction with the first driving unit; a sensing magnet disposed on one side of the bobbin; a location detection sensor configured to sense a location of the sensing magnet; and a correction magnet disposed on an opposite side of the bobbin.
According to the present disclosure, static tilt and dynamic tilt of the bobbin, to which a lens module is to be coupled, may be enhanced by a sensing magnet and a correction magnet which establish magnetic force equilibrium with each other.

First claim

What is claimed is:

1 . A lens moving device comprising:
a bobbin; a first driving unit coupled to the bobbin; a second driving unit configured to move the first driving unit through an electromagnetic interaction with the first driving unit; a sensing magnet disposed on one side of the bobbin; a location detection sensor configured to sense a location of the sensing magnet; and a correction magnet disposed on an opposite side of the bobbin.

2 . The lens moving device of claim 1 , wherein the sensing magnet and the correction magnet are spaced at a distance symmetrical to a center of the bobbin.

3 . The lens moving device of claim 1 , wherein a center of the bobbin is located on a virtual line connecting the sensing magnet and the correction magnet.

4 . The lens moving device of claim 1 , wherein the sensing magnet and the correction magnet have a shape and size symmetrical to each other.

5 . The lens moving device of claim 1 , wherein the sensing magnet and the correction magnet are disposed as to maintain a magnetic force equilibrium between each other.

6 . The lens moving device of claim 1 , wherein the first driving unit and the sensing magnet are disposed as being spaced in a direction corresponding to a direction of an optical axis of a lens module coupled to an inner side of the bobbin.

7 . The lens moving device of claim 1 , further comprising:
a holder member disposed at an outer side of the bobbin, the second driving unit coupled to the holder member; and an elastic member configured to elastically connect the bobbin and the holder member.

8 . The lens moving lens of claim 7 , wherein the elastic member includes:
an upper elastic member configured to elastically connect an upper portion of the bobbin and an upper portion of the holder member; and a lower elastic member configured to elastically connect a lower portion of the bobbin and a lower portion of the holder member.

9 . The lens moving device of claim 7 , wherein the second driving unit is arranged at a corner portion formed whereby a first side surface and a second side surface of the holder member encounter with each other, and the sensing magnet is disposed as being facing to the first side surface.

10 . The lens moving device of claim 9 , wherein the bobbin includes:
a first outer circumferential surface being facing to the first side surface; a second outer circumferential surface being facing to the second side surface; and a third outer circumferential surface being facing to the corner portion, wherein the sensing magnet is disposed on the first outer circumferential surface.

11 . The lens moving device of claim 7 , wherein the location detection sensor is inserted in a accommodation portion formed whereby a portion of an outer circumferential surface of the holder member is internally recessed.

12 . The lens moving device of claim 7 , further comprising:
a third driving unit configured to move the second driving unit through an electromagnetic interaction with the second driving unit; a base, the third driving unit coupled to the base; and a support member configured to elastically connect the holder member and the base.

13 . The lens moving device of claim 12 , wherein the first driving unit includes a first coil,
the second driving unit includes a magnet, and the third driving unit includes a second coil.

14 . The lens driving device of claim 12 , wherein the bobbin is movably supported, by the elastic member, in a direction corresponding to a direction of an optical axis of a lens module coupled to an inner side of the bobbin with respect to the holder member, and
the holder member is movably supported, by the support member, in a direction different from a direction of an optical axis of the lens module with respect to the base.

15 . The lens moving device of claim 12 , wherein the support member includes four leaf springs.

16 . The lens moving device of claim 1 , wherein the sensing magnet includes a pair of polarities (N, S) disposed on a surface facing to the location detection sensor.

17 . A camera module comprising:
a lens module; a bobbin, the lens module disposed on an inner side of the bobbin; a first driving unit coupled to the bobbin; a second driving unit configured to move the first driving unit through an electromagnetic interaction with the first driving unit; a sensing magnet disposed on one side of the bobbin; a location detection sensor configured to sense a location of the sensing magnet; and a correction magnet disposed on an opposite side of the bobbin.

18 . The camera module of claim 17 , further comprising:
a controller configured to move the bobbin by applying electric power to the first driving unit, wherein the controller controls the electric power applied to the first driving unit by receiving a location of the sensing magnet sensed by the location detection sensor.

19 . An optical apparatus comprising:
a main body; a display unit configured to display information, by being disposed on the main body; and a camera module configured to photograph a picture or motion picture, by being installed in the main body, wherein the camera module includes: a lens module; a bobbin, the lens module disposed on an inner side of the bobbin; a first driving unit coupled to the bobbin; a second driving unit configured to move the first driving unit through an electromagnetic interaction with the first driving unit; a sensing magnet disposed on one side of the bobbin; a location detection sensor configured to sense a location of the sensing magnet; and a correction magnet disposed on an opposite side of the bobbin.

Assignees

• Lg Innotek Co Ltd

Inventors

• Han Jin Suk
• Yeo In Jae
• Cho Jae Hong

Classifications

• G02B27/646 Primary

  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

• G02B7/08

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

• G03B2205/0069

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

• G03B17/12

  with means for supporting objectives, supplementary lenses, filters, masks, or turrets · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title