Lens driving apparatus, and camera module and optical device comprising same
A lens moving apparatus is provided, including a housing, a bobbin disposed inside the housing, a coil disposed around the bobbin, a magnet disposed in the housing, an elastic member coupled to the housing and the bobbin, and a damper disposed on the elastic member and the housing. The elastic member includes an inner part coupled to the bobbin, an outer part coupled to the housing, and a connection part for coupling the inner part and the outer part. The connection part is disposed on first to fourth quadrants of a plane having a first axis and a second axis, and is symmetrical with reference to the first axis. The plane includes first and second sides facing each other in a direction in parallel to the first axis and third and fourth sides facing each other in a direction in parallel to the second axis.
1. A lens moving apparatus comprising:
a housing;
a bobbin disposed inside the housing;
a coil disposed on the bobbin;
a sensing magnet disposed on the bobbin;
a magnet disposed on the housing;
an upper elastic member comprising an outer portion coupled to an upper portion of the housing, an inner portion coupled to an upper portion of the bobbin and a connector connecting the inner portion to the outer portion;
a position sensor configured to detect an intensity of magnetic field of the sensing magnet for sensing displacement of the bobbin; and
a damper disposed both on the connector of the upper elastic member and on the housing,
wherein the damper is spaced apart from the inner and outer portions of the upper elastic member and contacts the connector,
wherein the connector is disposed in first to fourth quadrants of a plane defined by a first axis and a second axis,
wherein the plane comprises first and second sides facing each other in a direction in parallel to the first axis, and third and fourth sides facing each other in a direction in parallel to the second axis, and
wherein the housing comprises a first side portion corresponding to the first side of the plane, a second side portion corresponding to the second side of the plane, a third side portion corresponding to the third side of the plane, and a fourth side portion corresponding to the fourth side of the plane,
wherein the first axis is perpendicular to an optical axis and extends through a center of the upper elastic member and is in parallel to a direction extending toward the second side portion of the housing from the first side portion of the housing, and the second axis is perpendicular to the first axis and extends through the center of the upper elastic member and is in parallel to a direction extending toward the fourth side portion of the housing from the third side portion of the housing, and the center of the upper elastic member is a spatial center of the upper elastic member when viewed from above,
wherein the sensing magnet is disposed at a side surface of the bobbin corresponding to the third side portion of the housing so as to be aligned with the second axis, and the position sensor is disposed to be aligned with the second axis, and
wherein the damper is disposed closer to the third and fourth sides than to the first and second sides.
2. The lens moving apparatus according to claim 1 ,
wherein the damper is not symmetrical with respect to the first axis.
3. The lens moving apparatus according to claim 1 , wherein the damper is not symmetrical with respect to the second axis.
4. The lens moving apparatus according to claim 1 , wherein the housing comprises a protrusion corresponding to the connector, and the damper is disposed both on the protrusion and on the connector.
5. The lens moving apparatus according to claim 1 , wherein the housing has an escape groove configured to inhibit spatial interference with the connector, at least a portion of the connector is disposed in the escape groove.
6. The lens moving apparatus according to claim 1 , wherein the connector comprises a plurality of frame connectors, which are spaced apart from each other, and the damper comprises a plurality of dampers, which are disposed on the plurality of frame connectors.
7. The lens moving apparatus according to claim 6 ,
wherein the connector comprises a first frame connector, a second frame connector, a third frame connector, and a fourth frame connector.
8. The lens moving apparatus according to claim 6 , wherein the housing comprises a plurality of protrusions corresponding to the plurality of frame connectors, respectively.
9. The lens moving apparatus according to claim 1 , wherein the damper is disposed closer to the outer portion of the upper elastic member than to the inner portion of the upper elastic member.
10. A lens moving apparatus comprising:
a housing;
a bobbin disposed inside the housing;
a coil disposed on the bobbin;
a sensing magnet disposed on the bobbin;
a balancing magnet disposed on the bobbin;
a magnet disposed on the housing;
an upper elastic member comprising an outer portion coupled to an upper portion of the housing, an inner portion coupled to an upper portion of the bobbin, and a connector connecting the inner portion to the outer portion;
a position sensor configured to detect an intensity of magnetic field of the sensing magnet for sensing displacement of the bobbin; and
a damper disposed both on the connector of the upper elastic member and on the housing,
wherein the damper is spaced apart from the inner and outer portions of the upper elastic member and contacts the connector,
wherein the connector is disposed in first to fourth quadrants of a plane defined by a first axis and a second axis,
wherein the plane comprises:
first and second sides facing each other in a direction in parallel to the first axis; and
third and fourth sides facing each other in a direction in parallel to the second axis,
wherein the damper is disposed in at least one of the first to fourth quadrants of the plane,
wherein the housing comprises a first side portion corresponding to the first side of the plane, a second side portion corresponding to the second side of the plane, a third side portion corresponding to the third side of the plane, and a fourth side portion corresponding to the fourth side of the plane,
wherein the first axis is perpendicular to an optical axis and extends through a center of the upper elastic member and is in parallel to a direction extending toward the second side portion of the housing from the first side portion of the housing, and the second axis is perpendicular to the first axis and extends through the center of the upper elastic member and is in parallel to a direction extending toward the fourth side portion of the housing from the third side portion of the housing, and the center of the upper elastic member is a spatial center of the upper elastic member when viewed from above,
wherein the sensing magnet is disposed at a side surface of the bobbin corresponding to the third side portion of the housing so as to be aligned with the second axis, and the position sensor is disposed to be aligned with the second axis, and
wherein the balancing magnet is disposed at another side surface of the bobbin opposite to the first side surface of the bobbin on which the sensing magnet is disposed.
11. The lens moving apparatus according to claim 1 , comprising a lower elastic member coupled with a lower portion of the housing and a lower portion of the bobbin.
12. The lens moving apparatus according to claim 1 , wherein the coil comprises:
a first coil unit disposed to be opposite to the first magnet unit; and
a second coil unit disposed to be opposite to the second magnet unit.
13. The lens moving apparatus according to claim 1 , comprising a base disposed under the housing.
14. The lens moving apparatus according to claim 13 , wherein the position sensor is disposed on the base.
15. The lens moving apparatus according to claim 1 , wherein the damper is disposed in at least one of the first to fourth quadrants of the plane.
16. The lens moving apparatus according to claim 1 , wherein the magnet comprises:
a first magnet unit disposed on the first side portion of the housing; and
a second magnet unit disposed on the second side portion of the housing.
17. The lens moving apparatus according to claim 10 , wherein the balancing magnet is disposed to be aligned with the second axis.
18. The lens moving apparatus according to claim 10 , comprising a base disposed under the housing,
wherein the position sensor is disposed on the base.
19. A camera module comprising:
a lens;
the lens moving apparatus according to claim 1 ; and
an image sensor.