Lens driving device, camera module, and optical device

1 . A lens driving device comprising:

a base;

a first frame disposed on the base;

a second frame disposed on the first frame;

a third frame disposed between the first frame and the second frame;

a second magnet disposed on the second frame;

a second coil disposed at a position corresponding to the second magnet;

a third ball in contact with the first frame and the base;

a cover member including an upper plate and a side plate extending from the upper plate; and

a spacer disposed between the cover member and the base,

wherein the first frame is configured to be moved in an optical axis direction,

wherein the second magnet and the second coil are configured to move the second frame in a direction perpendicular to the optical axis direction,

wherein the base comprises a first lateral wall, and a groove formed on an inner surface of the first lateral wall and disposed with the third ball,

wherein the spacer is formed separately from the base,

wherein the spacer includes an upper plate comprising a lower surface disposed on an upper surface of the first lateral wall of the base and a protruding portion protruding in a longitudinal axis of the protruding portion from the lower surface of the upper plate,

wherein the protruding portion is overlapped with the third ball in the optical axis direction, and

wherein the protruding portion protrudes toward the third ball.

2 . The lens driving device of claim 1 , comprising a substrate disposed between the base and the first frame,

wherein the second coil is disposed between the first frame and the substrate.

3 . The lens driving device of claim 2 , wherein the substrate comprises a first region coupled to the base, a second region coupled to the first frame, and an elastic connection portion connecting the first region and the second region, and

wherein the elastic connection portion of the substrate comprises a portion having flexibility.

4 . The lens driving device of claim 3 , wherein the elastic connection portion of the substrate comprises a shape bent a plurality of times, and

wherein the elastic connection portion of the substrate is overlapped with the second coil in the optical axis direction.

5 . The lens driving device of claim 2 , wherein the substrate is formed in a shape symmetrical with respect to an optical axis.

6 . The lens driving device of claim 1 , comprising:

a first ball disposed between the first frame and the third frame; and

a second ball disposed between the third frame and the second frame.

7 . The lens driving device of claim 6 , wherein the first frame comprises a first groove disposed with the first ball,

wherein the first ball is in contact with the first frame at two or more points, and

wherein the first groove of the first frame is formed to be greater than a diameter of the first ball in a first direction perpendicular to the optical axis direction.

8 . The lens driving device of claim 7 , wherein the third frame comprises a first groove formed on an upper surface of the third frame and disposed with the second ball, and

wherein the first groove of the third frame is formed to be greater than a diameter of the second ball in a second direction perpendicular to the optical axis direction and the first direction.

9 . The lens driving device of claim 8 , wherein the third frame comprises a second groove formed on a lower surface of the third frame and disposed with the first ball,

wherein the second groove of the third frame is formed in a shape corresponding with at least a portion of the first ball,

wherein the second frame comprises a groove disposed with the second ball, and

wherein the groove of the second frame is formed in a shape corresponding with at least a portion of the second ball.

10 . The lens driving device of claim 6 , wherein the first ball is configured to guide the third frame to move in a first direction perpendicular to the optical axis direction with respect to the first frame, and

wherein the second ball is configured to guide the second frame to move in a second direction perpendicular to the optical axis direction and the first direction with respect to the third frame.

11 . The lens driving device of claim 1 , comprising:

a first coil disposed on the first frame; and

a first magnet disposed on the base.

12 . The lens driving device of claim 11 , comprising a first yoke disposed on the first frame and disposed in the first coil.

13 . The lens driving device of claim 6 , comprising a substrate disposed between the base and the first frame,

wherein the first frame comprises a lower plate and a side plate extending from the lower plate,

wherein second coil disposed on a lower surface of the lower plate of the first frame, and

wherein the substrate is coupled with the lower surface of the lower plate of the first frame.

14 . The lens driving device of claim 13 , comprising a second yoke disposed on the lower surface of the lower plate of the first frame and disposed in the second coil.

15 . The lens driving device of claim 1 ,

wherein the third ball is configured to guide the first frame to be moved in the optical axis direction with respect to the base.

16 . The lens driving device of claim 11 , comprising:

a substrate disposed between the base and the first frame;

a driver IC comprising a Hall element configured to sense the first magnet, disposed on the substrate and electrically connected with the first coil; and

a Hall sensor disposed on the substrate and configured to sense the second magnet.

17 . A camera module comprising:

a printed circuit board;

an image sensor disposed on the printed circuit board;

the lens driving device of claim 1 disposed on the printed circuit board; and

a lens coupled with the lens driving device.

18 . An optical device comprising:

a main body;

the camera module of claim 17 disposed on the main body; and

a display disposed on the main body and configured to output at least any one of an image and a video photographed by the camera module.

19 . A lens driving device comprising:

a base;

a housing disposed on the base;

a holder disposed on the housing;

a first magnet and a first coil configured to move the housing and the holder in an optical axis direction;

a second magnet disposed on the holder;

a second coil disposed at a position corresponding to the second magnet;

a third ball in contact with the housing and the base;

a cover member including an upper plate and a side plate extending from the upper plate; and

a spacer disposed between the cover member and the base,

wherein the second coil is configured to move the holder in a direction perpendicular to the optical axis direction,

wherein the base comprises a first lateral wall, and a groove formed on an inner surface of the first lateral wall and disposed with the third ball,

wherein the spacer is formed separately from the base,

wherein the spacer includes an upper plate comprising a lower surface disposed on an upper surface of the first lateral wall of the base and a protruding portion protruding in a longitudinal axis of the protruding portion from the lower surface of the upper plate,

wherein the protruding portion is overlapped with the third ball in the optical axis direction, and

wherein the protruding portion protrudes toward the third ball.

20 . The lens driving device of claim 1 , wherein at least a portion of the protruding portion of the spacer is inserted into the groove of the base, and

wherein the at least a portion of the protruding portion of the spacer is overlapped with the groove of the base in the direction perpendicular to the optical axis direction.