Camera module
There is provided a camera module including a plurality of ball bearings to support the driving of a lens barrel at the time of compensating for unintended camera movement due to disturbance such as hand shake. The lens barrel may be driven in first and second directions, independently, by one driving force exerted in the first direction perpendicular to an optical axis and by another driving force exerted in the second direction perpendicular to both the optical axis and the first direction, thereby preventing driving displacement from being generated at the time of compensating for unwanted motion such as hand shake while securing reliability against external impact, and having reduced power consumption at the time of compensating for the disturbance.
1. A camera module comprising:
a first frame accommodating a lens module;
a first magnet attached to the lens module;
a first coil opposing the first magnet in a first direction perpendicular to an optical axis direction, and configured to interact with the first magnet to generate a driving force in the first direction;
a second magnet attached to the lens module;
a second coil opposing the second magnet in a second direction perpendicular to both the first direction and the optical axis direction, and configured to interact with the second magnet to generate a driving force in the second direction; and
a plurality of yoke parts provided in the first frame, and configured to generate at least a magnetic attraction between a first yoke part and the first magnet in the optical axis direction.
2. The camera module of claim 1 , wherein the lens module comprises a lens barrel including a lens and a second frame and a third frame accommodating the lens barrel, and the first magnet and the second magnet are mounted in the third frame.
3. The camera module of claim 2 , wherein the second frame and the third frame are configured to be movable in the optical axis direction together with the first frame, the second frame and the third frame are configured to be movable in the first direction within the first frame, and the third frame is configured to be movable, relative to the second frame, in the second direction within the first frame.
4. The camera module of claim 3 , wherein the first frame and the second frame are provided with a first ball bearing part therebetween, the first ball bearing part being configured to move in the first direction in a rolling motion.
5. The camera module of claim 4 , wherein the first frame and the second frame respectively include a first accommodation groove that accommodates the first ball bearing part.
6. The camera module of claim 5 , wherein the first accommodation groove guides the first ball bearing part to be moved in the first direction in the rolling motion and restricts a movement of the first ball bearing part in a direction perpendicular to the first direction.
7. The camera module of claim 3 , wherein the second frame and the third frame are provided with a second ball bearing part therebetween, the second ball bearing part being configured to move in the second direction in a rolling motion.
8. The camera module of claim 7 , wherein the second frame and the third frame respectively include a second accommodation groove that accommodates the second ball bearing part.
9. The camera module of claim 8 , wherein the second accommodation groove guides the second ball bearing part to be moved in the second direction in the rolling motion and restricts a movement of the second ball bearing part in a direction perpendicular to the second direction.
10. The camera module of claim 1 , further comprising a housing that accommodates the first frame, wherein the first frame is configured to move, relative to the housing, in the optical axis direction.
11. The camera module of claim 10 , wherein the first frame and the housing are provided with a third ball bearing part therebetween, the third ball bearing part being configured to move in the optical axis direction in a rolling motion.
12. The camera module of claim 10 , further comprising an auto-focus driving part configured to generate driving force in the optical axis direction,
wherein the auto-focus driving part comprises a third magnet attached to the first frame and a third coil disposed to face the third magnet.
13. The camera module of claim 1 , wherein the first coil and the second coil have a loop shape in which a hole is respectively formed, a length between two ends of the first magnet in the optical axis direction is greater than a length of the hole of the first coil in the optical axis direction, and is shorter than a length between two ends of the first coil in the optical axis direction, and a length between two ends of the second magnet in the optical axis direction is greater than a length of the hole of the second coil in the optical axis direction, and is shorter than a length between two ends of the second coil in the optical axis direction.
14. The camera module of claim 1 , wherein the first frame is configured to be movable in the optical axis direction together with the lens module.
15. A camera module comprising:
a first frame driven in a housing in an optical axis direction;
a second frame driven in a first direction perpendicular to the optical axis direction within the first frame;
a third frame driven in the first direction and a second direction, perpendicular to the first direction, within the first frame; and
a plurality of yoke parts provided in the first frame to allow at least a magnetic attraction to act between a yoke part of the plurality of yoke parts and the third frame in the optical axis direction.
16. The camera module of claim 15 , further comprising:
a disturbance compensation part comprising a first magnet and a second magnet mounted on the third frame;
a first coil disposed to face the first magnet in the first direction and generate a driving force in the first direction; and
a second coil disposed to face the second magnet in the second direction and generate a driving force in the second direction.
17. The camera module of claim 16 , wherein the yoke part faces the first magnet and the second magnet in the optical axis direction.
18. The camera module of claim 16 , wherein the first coil and the second coil have a loop shape in which a hole is respectively formed, a length between two ends of the first magnet in the optical axis direction is greater than a length of the hole of the first coil in the optical axis direction, and is shorter than a length between two ends of the first coil in the optical axis direction, and a length between two ends of the second magnet in the optical axis direction is greater than a length of the hole of the second coil in the optical axis direction and is shorter than a length between two ends of the second coil in the optical axis direction.
19. The camera module of claim 15 , wherein a lens barrel is mounted in the third frame.
20. The camera module of claim 15 , wherein the second frame and the third frame are configured to be movable in the optical axis direction together with the first frame.
21. A camera module comprising:
a housing;
a lens module accommodated in the housing;
a first magnet coupled to the housing;
a second magnet coupled to the housing and disposed orthogonal to the first magnet;
a first coil facing the first magnet in a first direction orthogonal to an optical axis direction, and configured to interact with the first magnet to drive the lens module in the first direction;
a second coil facing the second magnet in a second direction orthogonal to the optical axis direction, and configured to interact with the second magnet to drive the lens module in the second direction, and
a plurality of yoke parts provided in the first frame, and configured to generate at least a magnetic attraction between a first yoke part and the first magnet in the optical axis direction.
22. The camera module of claim 21 , further comprising one or more yoke parts configured to generate a magnetic attraction in the optical axis direction between the yoke part and the first magnet and the second magnet.
23. The camera module of claim 21 , wherein a driving force generated by the first coil and the first magnet differs from a driving force generated by the second coil and the second magnet.
24. The camera module of claim 21 , wherein the lens module is mounted in a first frame, and the first coil and the first magnet are configured to move a second frame and a third frame in the first direction, and the second magnet and the second coil are configured to move the third frame in the second direction.