Lens moving apparatus

Patent metadata

Field	Value
Publication number	US-11774775-B2
Application number	US-202217663806-A
Country	US
Kind code	B2
Filing date	May 17, 2022
Priority date	Dec 17, 2014
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

An embodiment includes a bobbin provided at an outer circumferential surface thereof with a first coil, a first position sensor disposed on the outer circumferential surface of the bobbin and spaced apart from the first coil, a first magnet disposed so as to be opposite to the first position sensor, a second magnet disposed so as to be opposite to the first coil, the second magnet being configured to move the bobbin in a direction parallel to an optical axis via electromagnetic interaction with the first coil, a housing configured to support the first magnet and the second magnet; and upper and lower elastic members coupled to the bobbin and the housing, wherein the first position sensor is moved along with the bobbin.

First claim

The invention claimed is:

1. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing;
a first coil disposed on the bobbin;
a magnet disposed to be overlapped with the first coil in a first direction perpendicular to an optical axis direction;
a position sensor disposed on the bobbin; and
a first elastic member coupled to the bobbin and the housing,
wherein a top surface of the position sensor is higher than a top surface of the magnet and lower than the first elastic member.

2. The lens moving apparatus according to claim 1 , wherein the position sensor is disposed on a lateral surface of a corner portion of the bobbin.

3. The lens moving apparatus according to claim 1 , comprising a sensing magnet disposed to be overlapped with the position sensor in a second direction perpendicular to the optical axis direction.

4. The lens moving apparatus according to claim 3 , wherein the second direction is a direction passing through two opposing corners of the housing, and the center of the position sensor does not overlap the magnet in the second direction.

5. The lens moving apparatus according to claim 3 , wherein a center of the sensing magnet does not overlap the magnet in the second direction.

6. The lens moving apparatus according to claim 3 , wherein the sensing magnet is higher than the magnet in the optical axis direction and separated from the magnet on the housing.

7. The lens moving apparatus according to claim 1 , wherein the magnet comprises first to fourth magnet units disposed on four lateral portions of the housing.

8. The lens moving apparatus according to claim 1 , comprising a circuit board on which the position sensor is disposed.

9. The lens moving apparatus according to claim 1 , wherein a bottom surface of the position sensor is disposed lower than a top surface of the magnet.

10. The lens moving apparatus according to claim 1 , wherein the position sensor is spaced apart from the first coil in the optical axis direction.

11. The lens moving apparatus according to claim 1 , comprising:
a base disposed under the housing; and
a second coil disposed to be overlapped with the magnet in the optical axis direction.

12. The lens moving apparatus according to claim 1 , wherein the position sensor is configured to detect a movement of the bobbin in the optical axis direction.

13. The lens moving apparatus according to claim 1 , comprising:
a circuit board disposed under the housing;
a second coil disposed on the circuit board and configured to move the housing by an interaction with the magnet; and
a wire coupled to the first elastic member and electrically connected to the circuit board.

14. The lens moving apparatus according to claim 1 , wherein the first coil is disposed to surround an outer surface of the bobbin.

15. A lens moving apparatus comprising:
a housing;
a bobbin disposed in the housing;
a first coil disposed on the bobbin;
a magnet disposed to be overlapped with the first coil in a first direction perpendicular to an optical axis direction;
a position sensor disposed on the bobbin;
a sensing magnet disposed to be overlapped with the position sensor in a second direction perpendicular to the optical axis direction; and
a first elastic member coupled to the bobbin and the housing,
wherein the bobbin comprises:
a first surface perpendicular to the first direction;
a second surface parallel to the first direction; and
a third surface perpendicular to the second direction,

wherein the position sensor is disposed on the third surface of the bobbin and spaced apart from the first coil, and
wherein a top surface of the position sensor is higher than a top surface of the magnet and lower than the first elastic member.

16. The lens moving apparatus according to claim 15 , wherein the first coil is disposed on the first surface of the bobbin.

17. The lens moving apparatus according to claim 16 , wherein the third surface of the bobbin is disposed higher than the first surface of the bobbin, and
wherein a distance between the third surface of the bobbin and an optical axis is smaller than a distance between the first surface of the bobbin and the optical axis.

18. The lens moving apparatus according to claim 15 , comprising:
a circuit board disposed under the housing;
a second coil disposed on the circuit board and configured to move the housing by an interaction with the magnet; and
a wire coupled to the first elastic member and electrically connected to the circuit board.

19. The lens moving apparatus according to claim 15 , wherein the magnet comprises a first magnet unit and a second magnet unit,
wherein the sensing magnet is disposed between a first reference line and a second reference line, when viewed from a top, and
wherein the first reference line is a straight line wherein an optical axis and one end of the first magnet unit meet, and the second reference line is a straight line wherein the optical axis and one end of the second magnet unit meet.

20. A lens moving apparatus comprising:
a base;
a housing disposed on the base;
a bobbin disposed in the housing;
a first coil disposed on an outer surface of the bobbin;
a magnet disposed to be overlapped with the first coil in a first direction perpendicular to an optical axis direction;
a position sensor disposed on the bobbin;
a sensing magnet disposed to be overlapped with the position sensor in a second direction perpendicular to the optical axis direction;
an elastic member coupled to the bobbin and the housing; and
a second coil disposed between the base and the housing,
wherein the elastic member comprises:
a first elastic member connected with an upper portion of the bobbin and an upper portion of the housing; and
a second elastic member connected with a lower portion of the bobbin and a lower portion of the housing,

wherein the position sensor is disposed on a first area of the outer surface of the bobbin different from that of the outer surface of the bobbin in which the coil is disposed,
wherein the second coil is overlapped with the magnet in the optical axis direction,
wherein the position sensor is disposed between the first elastic member and the second elastic member,
wherein a top surface of the position sensor is higher than a top surface of the magnet, and
wherein a bottom surface of the position sensor is lower than the top surface of the magnet.

Assignees

• Lg Innotek Co Ltd

Inventors

• Park Sang Ok
• Min Sang Jun
• Jung Tae Jin
• Yoo Hyune O

Classifications

• G02B27/64 Primary

  Imaging systems using optical elements for stabilisation of the lateral and angular position of the image · CPC title

• G02B7/09

  adapted for automatic focusing or varying magnification · CPC title

• H04N23/51

  Housings · CPC title

• H04N23/55

  Optical parts specially adapted for electronic image sensors; Mounting thereof · CPC title

• G02B27/646 Primary

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title