Lens moving apparatus

Patent metadata

Field	Value
Publication number	US-11360321-B2
Application number	US-201916709130-A
Country	US
Kind code	B2
Filing date	Dec 10, 2019
Priority date	Dec 17, 2014
Publication date	Jun 14, 2022
Grant date	Jun 14, 2022

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 cover member formed of a non-magnetic material;
a housing disposed in the cover member;
a bobbin disposed in the housing;
a first coil coupled to the bobbin;
a first position sensor coupled to the bobbin;
a first magnet coupled to the housing and facing the first position sensor;
a second magnet coupled to the housing and spaced apart from the first magnet;
an upper elastic member coupled to an upper surface of the bobbin and an upper surface of the housing;
a circuit board including a second coil facing the second magnet and disposed below the housing and comprising a plurality of terminals; and
a support member connecting the upper elastic member and to the circuit board;
wherein the upper elastic member comprises a first upper elastic member, a second upper elastic member, a third upper elastic member, and a fourth upper elastic member that are separated from each other;
wherein the support member comprises a first support member connecting the first upper elastic member, a second support member connecting the second upper elastic member, a third support member connecting the third upper elastic member, and a fourth support member connecting the fourth upper elastic member;
wherein the first position sensor is electrically connected to the circuit board via the first to fourth upper elastic members and the first to fourth support members,
wherein each of the first to fourth upper elastic members comprises an inner frame coupled to an upper surface of the bobbin, an outer frame coupled to an upper surface of the housing, and a frame connection portion connecting the inner frame to the outer frame, and
wherein the housing comprises four second side portions corresponding to four corners of the housing and four first side portions located between the four second side portions, and the first magnet is disposed on one of the four second side portions.

2. The lens moving apparatus according to claim 1 , wherein the second magnet comprises four second magnets, and the four second magnets are disposed on the four first side portions, respectively.

3. The lens moving apparatus according to claim 1 , wherein the second coil is electrically connected to the circuit board.

4. The lens moving apparatus according to claim 1 , wherein the housing comprises a stopper formed on the upper surface of the housing, and
wherein an upper surface of the stopper is higher than an upper surface of the first magnet.

5. The lens moving apparatus according to claim 4 , wherein the housing comprises a support boss formed on the upper surface of the housing and coupled to the outer frame, and
wherein the upper surface of the stopper is higher than an upper surface of the support boss.

6. The lens moving apparatus according to claim 4 , wherein the housing comprises support bosses formed on an upper surface of each of the four second side portions, and the support bosses are coupled to the outer frame of the first to fourth upper elastic members ( 150 ), and
wherein the upper surface of the first magnet is lower than the support boss.

7. The lens moving apparatus according to claim 1 , wherein the bobbin is configured to be driven in an upward direction from the initial position when a current of forward direction is applied to the first coil, and the bobbin is configured to be driven in a downward direction from the initial position when a current of backward direction is applied to the first coil.

8. The lens moving apparatus according to claim 1 , comprising four elastic member contact portions disposed on the bobbin, and
wherein the four elastic member contact portions are connected to the first to fourth upper elastic members, respectively.

9. The lens moving apparatus according to claim 8 , wherein the first position sensor is disposed below the four elastic member contact portions.

10. The lens moving apparatus according to claim 8 , comprising a sensor board disposed between the bobbin and the first position sensor and spaced apart from the first coil,
wherein the first position sensor is mounted on the sensor board, and
wherein the four elastic member contact portions are formed on the sensor board.

11. The lens moving apparatus according to claim 10 , wherein the sensor board comprises a body,
wherein the body includes a main coupling portion surrounding the outer surface of the bobbin in a direction in which the main coupling portion is rotated about an optical axis and a sensor grip portion extending downward from the main coupling portion, the first position sensor being disposed on the sensor grip portion, and
wherein the four elastic member contact portions protrude from the body, and each of the four elastic member contact portions contacts the corresponding inner frame of the first to fourth upper elastic members.

12. The lens moving apparatus according to claim 8 , wherein the four elastic member contact portions are electrically connected to the first position sensor.

13. The lens moving apparatus according to claim 12 , wherein the frame connection portion includes at least one bent shape and is located on a diagonal line of the housing.

14. The lens moving apparatus according to claim 1 , wherein the housing comprises a seating recess formed in an inner side surface of one of the second side portions, and
wherein the first magnet is disposed in the seating recess.

15. The lens moving apparatus according to claim 1 , comprising:
a lower elastic member coupled to a lower surface of the bobbin and a lower surface of the housing;
a base disposed below the circuit board, and
a second position sensor disposed between the circuit board and the base and electrically connected to the circuit board.

16. The lens moving apparatus according to claim 15 , comprising fifth and sixth upper elastic members,
wherein the lower elastic member comprises first and second lower elastic members electrically connected to the first coil,
wherein the first lower elastic member is connected to the fifth upper elastic member, and the second lower elastic member is connected to the sixth upper elastic member, and

wherein the support member comprises a fifth support member connecting the fifth upper elastic member and a sixth support member connecting the sixth upper elastic member.

17. The lens moving apparatus according to claim 1 , wherein the first coil includes a ring-shaped coil block disposed around an outer circumferential surface of the bobbin.

18. The lens moving apparatus according to claim 1 , wherein an upper surface of the first magnet is lower than the outer frame of the upper elastic member.

19. A camera module comprising:
an image sensor;
a printed circuit board on which the image sensor is mounted; and
the lens moving apparatus according to claim 1 .

20. A lens moving apparatus comprising:
a cover member formed of a non-magnetic material;
a housing disposed in the cover member and comprising four corners and four side portions located between the four corners;
a bobbin disposed in the housing;
a first coil coupled to the bobbin;
a first position sensor coupled to the bobbin;
a first magnet coupled to the housing and facing the first position sensor;
a second magnet coupled to the housing and spaced apart from the first magnet;
an upper elastic member coupled to an upper surface of the bobbin and an upper surface of the housing;
a circuit board including a second coil facing the second magnet and disposed

Assignees

• Lg Innotek Co Ltd

Inventors

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

Classifications

• H04N23/55

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

• H04N23/51

  Housings · 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

• G03B5/00 Primary

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G02B7/09

  adapted for automatic focusing or varying magnification · CPC title