Lens moving unit comprising a sensing magnet and a correction magnet

Patent metadata

Field	Value
Publication number	US-12328504-B2
Application number	US-202318364586-A
Country	US
Kind code	B2
Filing date	Aug 3, 2023
Priority date	Mar 17, 2014
Publication date	Jun 10, 2025
Grant date	Jun 10, 2025

Abstract

One embodiment of a lens moving unit includes a bobbin mounted with at least one sheet of lens and arranged at a periphery with a coil unit, a cover member mounted with a magnet at a position corresponding to that of the coil unit, upper and bottom elastic members respectively coupled at one distal end to upper and bottom surfaces of the bobbin to support movement of the bobbin to an optical axis direction, and a detection unit to detect a movement parallel to an optical axis of the bobbin, wherein the detection unit includes a sensing magnet mounted at a periphery of the bobbin, and a position detection sensor arranged at a lateral wall of the cover member and formed at an inner lateral surface opposite to the sensing magnet, wherein the bobbin includes a correction magnet mounted at a side opposite to that of the sensing magnet.

First claim

The invention claimed is:

1. A lens moving unit comprising:
a cover member;
a bobbin disposed in the cover member;
a coil disposed on the bobbin;
a driving magnet disposed between the cover member and the bobbin;
a sensing magnet disposed on the bobbin;
a correction magnet disposed on the bobbin and opposite to the sensing magnet;
a sensor configured to detect the sensing magnet; and
a circuit substrate disposed with the sensor,
wherein the cover member comprises an inner yoke,
wherein the bobbin comprises a groove disposed at a position corresponding with the inner yoke,
wherein at least a portion of the inner yoke is disposed in the groove of the bobbin, and
wherein an outer surface of the inner yoke directly faces the coil.

2. The lens moving unit of claim 1 , wherein an inner surface of the inner yoke opposite to the outer surface of the inner yoke directly faces the bobbin.

3. The lens moving unit of claim 1 , wherein the inner yoke comprises four inner yokes,
wherein the four inner yokes are disposed at positions corresponding to four corners of the cover member, respectively.

4. The lens moving unit of claim 1 , wherein the outer surface of the inner yoke is spaced apart from the coil, and
wherein an inner surface of the inner yoke is spaced apart from the bobbin.

5. The lens moving unit of claim 1 , wherein the cover member comprises an upper plate,
wherein the inner yoke comprises a bent portion bent from the upper plate of the cover member, and an escape groove formed adjacent to the bent portion.

6. The lens moving unit of claim 1 , wherein the cover member is formed of a metal,
wherein the cover member comprises an upper plate, and a lateral wall extending from an outer edge of the upper plate,
wherein the inner yoke extends from an inner edge of the upper plate, and
wherein the inner yoke is integrally formed with the upper plate.

7. The lens moving unit of claim 6 , wherein the circuit substrate is disposed on the lateral wall of the cover member, and
wherein the sensor is disposed on an inner surface of the circuit substrate so that the sensor is not exposed outside.

8. The lens moving unit of claim 7 , wherein the circuit substrate is disposed on an outer surface of the lateral wall of the cover member.

9. The lens moving unit of claim 1 , wherein the cover member comprises first and second lateral walls opposite to each other, and third and fourth lateral walls opposite to each other,
wherein the circuit substrate is disposed on the third lateral wall of the cover member, and
wherein the driving magnet comprises a first magnet disposed on the first lateral wall of the cover member, and a second magnet disposed on the second lateral wall of the cover member.

10. The lens moving unit of claim 9 , wherein the driving magnet is not disposed on the third and fourth lateral walls of the cover member.

11. The lens moving unit of claim 9 , wherein the third lateral wall of the cover member comprises a window, and
wherein the sensor is disposed on the window.

12. The lens moving unit of claim 1 , comprising:
a base; and
a lower elastic member connecting the bobbin and the base,
wherein the cover member is disposed on the base,
wherein the lower elastic member comprises first and second springs,
wherein the first spring electrically connects one of two ends of the coil and the circuit substrate, and
wherein the second spring electrically connects the other of the two ends of the coil and the circuit substrate.

13. The lens moving unit of claim 1 , wherein the circuit substrate comprises a plurality of terminals disposed on a lower portion of the circuit substrate.

14. The lens moving unit of claim 1 , comprising a base disposed with the cover member,
wherein at least a portion of the circuit substrate is disposed on a lateral surface of the base.

15. The lens moving unit of claim 1 , wherein the sensing magnet is smaller than the driving magnet, and
wherein the sensing magnet is disposed at a position not facing the driving magnet.

16. The lens moving unit of claim 1 , wherein the sensor comprises a Hall sensor,
wherein the bobbin comprises a sensing magnet mounting unit formed on an outer peripheral surface of the bobbin,
wherein the sensing magnet is disposed on the sensing magnet mounting unit so that at least three surfaces of the sensing magnet are surrounded by the sensing magnet mounting unit, and
wherein the sensing magnet is fixed to the sensing magnet mounting unit by an adhesive.

17. A camera module comprising:
a printed circuit board;
an image sensor disposed on the printed circuit board;
the lens moving unit of claim 1 ; and
a lens coupled to the bobbin of the lens moving unit.

18. A lens moving unit comprising:
a cover member;
a bobbin disposed in the cover member;
a coil disposed on the bobbin;
a driving magnet disposed between the cover member and the bobbin;
a sensing magnet disposed on the bobbin;
a correction magnet disposed on the bobbin and opposite to the sensing magnet;
a sensor configured to detect the sensing magnet; and
a circuit substrate disposed with the sensor,
wherein the bobbin comprises a groove,
wherein the cover member comprises an inner yoke disposed on the groove of the bobbin,
wherein an outer surface of the inner yoke is spaced apart from the coil, and
wherein an inner surface of the inner yoke is spaced apart from the bobbin.

19. The lens moving unit of claim 18 , wherein the cover member comprises an upper plate,
wherein the inner yoke comprises a bent portion bent from the upper plate of the cover member, and an escape groove formed adjacent to the bent portion.

20. The lens moving unit of claim 18 , wherein the cover member comprises first and second lateral walls opposite to each other, and third and fourth lateral walls opposite to each other,
wherein the circuit substrate is disposed on the third lateral wall of the cover member,
wherein the driving magnet comprises a first magnet disposed on the first lateral wall of the cover member, and a second magnet disposed on the second lateral wall of the cover member, and
wherein the driving magnet is not disposed on the third and fourth lateral walls of the cover member.

Assignees

• Lg Innotek Co Ltd

Inventors

• Jung Tae Jin
• Min Sang Jun

Classifications

• H04N23/6812

  based on additional sensors, e.g. acceleration sensors · CPC title

• H04N23/67

  Focus control based on electronic image sensor signals · CPC title

• H04N23/55

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

• G02B27/646

  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

• G02B7/08 Primary

  adapted to co-operate with a remote control mechanism · CPC title