Lens driving device
The present embodiment relates to a lens driving device comprising: a fixed part; a first moving part and a second moving part disposed in the fixed part; a first driving magnet disposed on the first moving part; a second driving magnet disposed in the second moving part; a first coil disposed in the fixed part and disposed at a position corresponding to the first driving magnet; and a second coil disposed in the fixed part and disposed at a position corresponding to the second driving magnet, wherein the center of the first coil is disposed more forward than the center of the second coil in an optical axis direction, and wherein a portion of the first coil is being overlapped with the second coil in a first direction perpendicular to the optical axis direction.
1 . A lens driving device comprising:
a fixed part;
a first moving part and a second moving part disposed in the fixed part;
a first driving magnet disposed on the first moving part;
a second driving magnet disposed on the second moving part;
a first coil disposed on the fixed part and disposed at a position corresponding to the first driving magnet;
a second coil disposed on the fixed part and disposed at a position corresponding to the second driving magnet;
a first Hall sensor and a second Hall sensor disposed in a hollow of the first coil and configured to detect the first driving magnet; and
a first yoke formed in a shape corresponding to the first driving magnet and disposed to cover at least a portion of at least three surfaces of the first driving magnet,
wherein, in an optical axis direction, a center of the first coil is disposed in front of a center of the second coil, and
wherein a portion of the first coil is overlapped with the second coil in a first direction perpendicular to the optical axis direction,
wherein the first driving magnet comprises a first magnet portion and a second magnet portion each having an N pole and an S pole, and a neutral portion or void disposed between the first magnet portion and the second magnet portion, and
wherein, in the optical axis direction, a size of the neutral portion or void is smaller than a size of the hollow of the first coil and is larger than a distance between the first Hall sensor and the second Hall sensor.
2 . The driving device of claim 1 , wherein the first coil comprises a portion not overlapped with the second coil in the first direction.
3 . The driving device of claim 1 , wherein, in a second direction perpendicular to the optical axis direction and the first direction, the center of the first coil is disposed at a height corresponding to the center of the second coil.
4 . The driving device of claim 3 , wherein the fixed part comprises a second yoke comprising a magnetic material,
wherein the first driving magnet is disposed such that an attractive force acts with the second yoke,
wherein, in a second direction perpendicular to the optical axis direction and the first direction, a width of the second yoke is greater than a width of a first surface of the first driving magnet facing a first surface of the second yoke.
5 . The driving device of claim 1 , wherein the fixed part comprises a housing and a first lens disposed on the housing,
wherein the first moving part comprises a first holder disposed in the housing, and a second lens disposed on the first holder,
wherein the second moving part comprises a second holder disposed in the housing, and a third lens disposed on the second holder, and
wherein the second lens is disposed between the first lens and the third lens.
6 . The driving device of claim 5 , wherein the first coil is formed to have a same size as the second coil and is disposed closer to the first lens than is the second coil.
7 . The driving device of claim 5 , wherein the first driving magnet is formed to have a same size as the second driving magnet and is disposed closer to the first lens than is the second driving magnet.
8 . The driving device of claim 1 , wherein a portion of the first driving magnet is overlapped with the second driving magnet in the first direction, and
wherein the first driving magnet comprises a portion not overlapped with the second driving magnet in the first direction.
9 . The driving device of claim 1 , wherein the fixed part comprises a second yoke comprising a magnetic material,
wherein the first driving magnet is disposed such that an attractive force acts with the second yoke, and
wherein, in a second direction perpendicular to each of the optical axis direction and the first direction, a width of the second yoke is greater than a width of a first surface of the first driving magnet facing a first surface of the second yoke.
10 . The driving device of claim 1 , wherein the first driving magnet comprises a first magnet portion and a second magnet portion each having an N pole and an S pole, and a neutral portion or void disposed between the first magnet portion and the second magnet portion,
wherein the first coil comprises a first portion facing the first magnet portion and a second portion facing the second magnet portion, and
wherein the first portion of the first coil is not overlapped with the second magnet portion in the first direction, and the second portion of the first coil is not overlapped with the first magnet portion in the first direction.
11 . The driving device of claim 1 , wherein the first moving part is configured to move to perform a zoom function when a current is applied to the first coil, and
wherein the second moving part is configured to move to perform an autofocus function when a current is applied to the second coil.
12 . A camera device comprising:
a printed circuit board;
an image sensor disposed on the printed circuit board;
a reflective member driving device; and
the lens driving device of claim 1 disposed between the image sensor and the reflective member driving device.
13 . The camera device of claim 12 , comprising:
a driver IC disposed on the printed circuit board and electrically connected to the first coil and the second coil;
a substrate electrically connecting the printed circuit board and the reflective member driving device; and
a temperature sensor disposed on the substrate.
14 . The camera device of claim 13 , wherein the temperature sensor is disposed adjacent to the first coil or the second coil.
15 . An optical device comprising:
a main body;
the camera device of claim 12 disposed on the main body; and
a display disposed in the main body and configured to output at least one of a video and an image photographed by the camera device.
16 . A lens driving device comprising:
a fixed part;
a first moving part and a second moving part disposed in the fixed part;
a first driving magnet disposed on the first moving part;
a second driving magnet disposed on the second moving part;
a first coil disposed on the fixed part and disposed at a position corresponding to the first driving magnet;
a second coil disposed on the fixed part and disposed at a position corresponding to the second driving magnet;
a first Hall sensor and a second Hall sensor disposed in a hollow of the first coil and configured to detect the first driving magnet; and
a yoke disposed between the first driving magnet and the first moving part,
wherein, in an optical axis direction, a center of the first coil is disposed in front of a center of the second coil,
wherein a portion of the first coil is overlapped with the second coil in a first direction perpendicular to the optical axis direction,
wherein, in a second direction perpendicular to the optical axis direction and the first direction, the center of the first coil is disposed at a height corresponding to the center of the second coil, and
wherein the yoke is configured to cover at least a portion of at least three surfaces of the first driving magnet,
wherein the first driving magnet comprises a first magnet portion and a second magnet portion each having an N pole and an S pole, and a neutral portion or void disposed between the first magnet portion and the second magnet portion, and
wherein, in the optical axis direction, a size of the neutral portion or void is smaller than a size of the hollow of the first coil and larger than a distance between the first Hall sensor and the second Hall sensor.
17 . A driving device comprising:
a fixed part comprising a first lens;
a first moving part disposed in the fixed part and comprising a second lens;
a second moving part disposed in the fixed part and comprising a third lens;
a first driving magnet disposed on the first moving part;
a second driving magnet disposed on the second moving part;
a first coil disposed at a position corresponding to the first driving magnet;
a second coil disposed at a position corresponding to the second driving magnet;
a first Hall sensor and a second Hall sensor disposed in a hollow of the first coil and configured to detect the first driving magnet; and
a yoke formed in a shape corresponding to the first driving magnet and disposed to cover at least a portion of at least three surfaces of the first driving magnet, wherein the first driving magnet is disposed closer to the first lens than is the second driving magnet,
wherein a portion of the first driving magnet is overlapped with the second driving magnet in a first direction perpendicular to an optical axis direction,
wherein the first driving magnet comprises a first magnet portion and a second magnet portion each having an N pole and an S pole, and a neutral portion or void disposed between the first magnet portion and the second magnet portion, and
wherein, in the optical axis direction, a size of the neutral portion or void is smaller than a size of the hollow of the first coil and larger than a distance between the first Hall sensor and the second Hall sensor.
18 . The driving device of claim 17 , wherein the first driving magnet comprises a portion not overlapped with the second driving magnet in the first direction.
19 . The driving device of claim 17 , wherein the first coil is disposed closer to the first lens than is the second coil.
20 . The driving device of claim 17 , wherein the first driving magnet is formed to have a same size as the second driving magnet.