Optical image stablilizer detecting X direction displacement and Y direction displacement of lens group
An optical image stabilizer, in which a magnet and a coil are arranged such that they oppose each other. The Hall sensor is arranged such that one face thereof is opposed to one face of the magnet. The Hall sensor can easily detect the location of a group of lenses by generating a corresponding signal in response to a variation in magnetic force following a variation in the gap between magnets depending on the direction in which a group of lenses is driven, and simultaneously, in response to a variation in magnetic force that occurs when the group of lenses is displaced in the direction that intersects the direction of the gap.
1. An optical image stabilizer comprising:
a drive unit including a magnet and a coil, the magnet being disposed in a direction perpendicularly intersecting with a Z direction of a lens group which is an optical axis direction of a camera module; and
a Hall sensor disposed to be opposed to the magnet in a direction facing the magnet,
wherein the Hall sensor detects change in magnetic force when the magnet moves in a direction intersecting with the Hall sensor, the Hall sensor detects change in magnetic force when the magnet moves in a direction changing mutual interval between the magnet and the Hall sensor, thus the Hall sensor can detect X direction displacement and Y direction displacement of the lens group.
2. The optical image stabilizer of claim 1 , wherein the Hall sensor is smaller than a thickness of the coil.
3. The optical image stabilizer of claim 1 , wherein the Hall sensor is disposed inside or outside the coil.
4. The optical image stabilizer of claim 3 , wherein the Hall sensor is disposed between an S pole and an N pole of the magnet.
5. An optical image stabilizer comprising:
a magnet provided in an auto-focusing unit, which includes an autofocus device, in a direction perpendicularly intersecting with a Z direction of the lens group which is an optical axis direction of a camera module so that a lens barrel comprising a lens group is linearly movable, S polarity of the magnet and N polarity of the magnet divided into left and right;
a coil disposed on a flexible printed circuit board supplying external power, the coil provided in a housing so that the coil and the magnet are disposed to face each other; and
a Hall sensor disposed on the flexible printed circuit board and disposed to be opposed to the magnet in a direction facing the magnet, the Hall sensor configured to detect change in magnetic force generated by movement of the lens group in an x, y direction,
wherein the Hall sensor detects change in magnetic force when the magnet moves in a direction intersecting with the Hall sensor, the Hall sensor detects change in magnetic force when the magnet moves in a direction changing mutual interval between the magnet and the Hall sensor, thus the Hall sensor can detect X direction displacement and Y direction displacement of the lens group.
6. The optical image stabilizer of claim 5 , comprising a plurality of coils, wherein the coils are arranged about the lens barrel such that the coils intersect each other.
7. The optical image stabilizer of claim 6 , wherein the Hall sensor is provided in at least two of the plurality of coils.
8. The optical image stabilizer of claim 5 , wherein the Hall sensor is arranged inside or outside the coil.
9. The optical image stabilizer of claim 5 , wherein the Hall sensor is smaller than a thickness of the coil.
10. The optical image stabilizer of claim 5 , wherein the Hall sensor is disposed between an S pole and an N pole of the magnet.
11. The optical image stabilizer of claim 2 , wherein the Hall sensor is disposed inside or outside the coil.
12. The optical image stabilizer of claim 1 , wherein the Hall sensor detects X direction displacement of the lens group by detecting change in magnetic force by movement in a direction intersecting the magnet and the Hall sensor and the Hall sensor detects Y direction displacement of the lens group by detecting change in magnetic force by the movement in a direction changing mutual interval between the magnet and the Hall sensor.
13. The optical image stabilizer of claim 1 , wherein surfaces facing each other of the magnet and the Hall sensor are disposed to be aligned to Z direction of the lens group.
14. The optical image stabilizer of claim 5 , wherein the Hall sensor detects X direction displacement of the lens group by detecting change in magnetic force by movement in a direction intersecting the magnet and the Hall sensor and the Hall sensor detects Y direction displacement of the lens group by detecting change in magnetic force by the movement in a direction changing mutual interval between the magnet and the Hall sensor.
15. The optical image stabilizer of claim 5 , wherein surfaces facing each other of the magnet and the Hall sensor are disposed to be aligned to Z direction of the lens group.