Lens moving device, camera module and optical apparatus
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.
1 . A lens moving device comprising:
a base;
a holder member disposed on the base;
a bobbin disposed in the holder member;
a first coil disposed on the bobbin;
a first magnet disposed on the holder member;
a second coil disposed between the base and the holder member;
a second magnet disposed on the bobbin; and
a location detection sensor disposed on the holder member,
wherein the second magnet comprises a sensing magnet disposed on a lateral surface of the bobbin and a correction magnet disposed to be overlapped with the sensing magnet in a first direction perpendicular to an optical axis,
wherein the first magnet is overlapped with the first coil in a second direction perpendicular to the optical axis and is overlapped with the second coil in a third direction parallel to the optical axis,
wherein, in the first direction, the sensing magnet is overlapped with the location detection sensor and is not overlapped with the first coil,
wherein the first coil is disposed between the base and the sensing magnet, and
wherein the sensing magnet is disposed between an upper surface of the bobbin and the first coil, wherein the bobbin comprises a recess formed on an outer lateral surface of the bobbin, and wherein the sensing magnet is disposed in the recess of the bobbin not to protrude further outward than the outer lateral surface of the bobbin.
2 . The lens moving device of claim 1 , wherein the location detection sensor is disposed on an accommodation portion formed by being recessed from a portion of the holder member.
3 . The lens moving device of claim 1 , wherein, in an optical axis direction, a portion of the bobbin is disposed between the sensing magnet and the first coil.
4 . The lens moving device of claim 1 , wherein the location detection sensor is disposed higher than the first magnet.
5 . The lens moving device of claim 1 , wherein the sensing magnet is not overlapped with the first magnet in the first direction.
6 . The lens moving device of claim 1 , wherein the bobbin comprises an accommodation portion formed on the outer lateral surface of the bobbin below the recess of the bobbin, and
wherein the first coil is disposed on the accommodation portion of the bobbin.
7 . The lens moving device of claim 1 , wherein the first magnet is disposed on each of four corner areas of the holder member.
8 . The lens moving device of claim 1 , comprising a cover member disposed on the base and comprising an upper plate and a lateral plate,
wherein the sensing magnet and the correction magnet are disposed to face corner sides of the cover member, and
wherein the location detection sensor is disposed on a corner side of the cover member corresponding with the sensing magnet.
9 . The lens moving device of claim 1 , wherein, in an optical axis direction, the sensing magnet is overlapped with the first coil.
10 . The lens moving device of claim 1 , wherein the first direction is different from the second direction.
11 . A camera module comprising:
a printed circuit board;
an image sensor disposed on the printed circuit board;
the lens moving device of claim 1 disposed above the printed circuit board; and
a lens coupled to the bobbin of the lens moving device.
12 . An optical apparatus comprising:
a body;
the camera module of claim 11 disposed on the body and configured to photograph a picture; and
a display disposed on the body and configured to display the picture photographed by the camera module.
13 . The lens moving device of claim 6 , wherein the first coil does not protrude from the outer lateral surface of the bobbin.
14 . The lens moving device of claim 1 , wherein, in an optical axis direction, a distance between the location detection sensor and an upper surface of the holder member is shorter than a distance between the location detection sensor and a lower surface of the holder member.
15 . The lens moving device of claim 1 , comprising:
an upper elastic member coupled with the bobbin and the holder member; and
a support member elastically supporting the holder member with respect to the base.
16 . The lens moving device of claim 15 , wherein the upper elastic member comprises two upper elastic members electrically connected with the first coil.
17 . The lens moving device of claim 1 , comprising a circuit board disposed on the base,
wherein the second coil is disposed on the circuit board.
18 . The lens moving device of claim 1 , wherein the bobbin is spaced apart from an upper surface of the base in an initial surface in which no current is applied to the first coil.
19 . The lens moving device of claim 1 , wherein the location detection sensor is configured to move together with the holder member when the holder member moves by an interaction between the second coil and the first magnet.