Lens driving apparatus, camera module, and optical device

Abstract

A lens driving device includes a first housing; a bobbin disposed in the first housing; an aperture disposed on the bobbin; a board disposed on the first housing; a second coil and a fourth coil disposed on the board; a second magnet disposed on the bobbin and facing the second coil; a fourth magnet disposed on the aperture and facing the fourth coil; and a fourth sensor disposed on the board and configured to sense the fourth magnet. The fourth coil is overlapped with the second coil in a first direction perpendicular to an optical axis direction.

1 . A lens driving device, comprising:
 a first housing;   a bobbin disposed in the first housing;   an aperture disposed on the bobbin;   a board disposed on the first housing;   a second coil and a fourth coil disposed on the board;   a second magnet disposed on the bobbin and facing the second coil;   a fourth magnet disposed on the aperture and facing the fourth coil; and   a fourth sensor disposed on the board and configured to sense the fourth magnet,   wherein the fourth coil is overlapped with the second coil in a first direction perpendicular to an optical axis direction.   
     
     
         2 . The lens driving device of  claim 1 , comprising a cover disposed on the first housing,
 wherein the cover comprises an upper plate and a plurality of side plates,   wherein the plurality of side plates of the cover comprises first and third side plates opposite to each other, and second and fourth side plates opposite to each other, and   wherein the fourth coil is disposed between the fourth magnet and the fourth side plate of the cover.   
     
     
         3 . The lens driving device of  claim 2 , wherein the second coil is disposed between the second magnet and the second side plate of the cover. 
     
     
         4 . The lens driving device of  claim 1 , wherein the second coil, the second magnet, the fourth magnet and the fourth coil are overlapped with each other in the first direction. 
     
     
         5 . The lens driving device of  claim 1 , wherein the fourth sensor is disposed in the fourth coil. 
     
     
         6 . The lens driving device of  claim 1 , comprising a second sensor disposed on the board and configured to sense the second magnet. 
     
     
         7 . The lens driving device of  claim 6 , wherein the fourth sensor is overlapped with the second sensor in the first direction. 
     
     
         8 . The lens driving device of  claim 1 , comprising:
 a second housing disposed between the first housing and the bobbin;   a first coil and a third coil disposed on the board;   a first magnet disposed on the second housing and facing the first coil; and   a third magnet disposed on the bobbin and facing the third coil.   
     
     
         9 . The lens driving device of  claim 8 , wherein the first to fourth coils are spaced apart from each other, the first coil and the third coil are disposed opposite to each other, and the second coil and the fourth coil are disposed opposite to each other,
 wherein the second housing is configured to move in an optical axis direction by the first magnet and the first coil,   wherein the bobbin is configured to move in the first direction perpendicular to the optical axis direction by the second magnet and the second coil,   wherein the bobbin is configured to move in a second direction perpendicular to both the optical axis direction and the first direction by the third magnet and the third coil,   wherein the aperture comprises a first blade and a second blade, and   wherein an area of a hole defined by the first blade and the second blade is configured to be adjusted by the fourth magnet and the fourth coil.   
     
     
         10 . The lens driving device of  claim 8 , wherein the board comprises first to fourth boards, and a connection board connecting the first to fourth boards,
 wherein the first coil is disposed on the first board,   wherein the second coil is disposed on the second board,   wherein the third coil is disposed on the third board, and   wherein the fourth coil is disposed on the fourth board.   
     
     
         11 . The lens driving device of  claim 8 , comprising:
 a first sensor disposed on the board and configured to sense the first magnet; and   a third sensor disposed on the board and configured to sense the third magnet.   
     
     
         12 . The lens driving device of  claim 8 , wherein the first housing comprises:
 a first corner, a second corner, a third corner and a fourth corner, each mutually spaced apart from the other;   a first connection part connecting the first corner and the second corner;   a second connection part connecting the second corner and the third corner;   a third connection part connecting the third corner and the fourth corner; and   a fourth connection part connecting the four corner and the first corner,   wherein the first coil is disposed on the first connection part, the second coil is disposed on the second connection part, the third coil is disposed on the third connection part and the fourth coil is disposed on the fourth connection part.   
     
     
         13 . The lens driving device of  claim 9 , wherein the aperture comprises a stator comprising a first guide and a second guide, a mover disposed on the stator and disposed with the fourth magnet, a connecting rod rotatably connected at one side with the mover, and a rotor rotatably connected to the other side of the connecting rod and rotatably connected at a center with the stator,
 wherein the first blade is disposed at one side of the rotor, and   wherein the second blade is disposed at the other side of the rotor.   
     
     
         14 . The lens driving device of  claim 13 , wherein the first blade comprises a first connection rod rotatably connected at one side to one side of the rotor and moving along the first guide, and a first blocking plate disposed at the other side of the first connection rod and formed with a first groove,
 wherein the second blade comprises a second connection rod rotatably connected at one side to the other side of the rotor, and moving along the second guide, and a second blocking plate disposed at the other side of the second connection rod and formed with a second groove, and   wherein the first groove and at least one portion of the second groove are overlapped to an optical axis direction.   
     
     
         15 . The lens driving device of  claim 14 , wherein the hole defined by the first blade and the second blade is a hole formed by the first groove and the second groove. 
     
     
         16 . The lens driving device of  claim 1 , comprising:
 a moving member disposed between the second housing and the bobbin;   one or more first ball bearings disposed between the first housing and the second housing;   one or more second ball bearings disposed between the moving member and the bobbin; and   one or more third ball bearings disposed between the second housing and the moving member.   
     
     
         17 . A camera module comprising:
 a printed circuit board (PCB);   an image sensor disposed on the PCB;   the lens driving device of  claim 1  disposed above the PCB; and   a lens coupled to the bobbin of the lens driving device.   
     
     
         18 . An optical apparatus comprising:
 a frame;   a display disposed on one surface of the frame; and   the camera module of  claim 17  disposed on the frame and electrically connected with the display.   
     
     
         19 . A lens driving device, comprising:
 a first housing;   a cover disposed on the first housing;   a bobbin disposed in the first housing;   an aperture disposed on the bobbin;   a board disposed on the first housing;   a second coil and a fourth coil disposed on the board;   a second magnet disposed on the bobbin and facing the second coil;   a fourth magnet disposed on the aperture and facing the fourth coil; and   a fourth sensor disposed on the board and configured to sense the fourth magnet,   wherein the cover comprises an upper plate and a plurality of side plates,   wherein the plurality of side plates of the cover comprises first and third side plates opposite to each other, and second and fourth side plates opposite to each other, and   wherein the fourth coil is disposed between the fourth magnet and the fourth side plate of the cover.   
     
     
         20 . A lens driving device, comprising:
 a first housing;   a bobbin disposed in the first housing;   a board disposed on the first housing;   a coil disposed on the board; and   a magnet disposed on the bobbin.