Lens moving unit and camera module having the same

• US 9,451,167 B2
• Filed: 01/26/2015
• Issued: 09/20/2016
• Est. Priority Date: 01/28/2014
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Lee, Kap Jin
• Primary Examiner(s): Monk, Mark
• Application Number:
  US14/605,672
• Publication Number:
  US 20150212291A1
• Time in Patent Office: 603 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G02B 13/003 having two lenses
• CPC Class Codes: G02B 27/646 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 Class Codes: G02B 7/04 with mechanism for focusing or varying magnification
• CPC Class Codes: G02B 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: G03B 2205/0015 by displacing one or more optical elements normal to the optical axis
• CPC Class Codes: G03B 2205/0069 using electromagnetic actuators, e.g. voice coils
• CPC Class Codes: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

A lens moving unit for a camera module is disclosed. The lens moving unit includes a first lens moving unit, a second lens moving unit, and a cover member to encompass the first and second lens moving units by being coupled to a base. The first lens moving unit moves in response to the interaction between a magnet and a coil. The lens moving unit is configured to miniaturize a camera module and configured to include a handshake correction function for enhancement of operational reliability to simplify an assembly process.

Claims

1. A lens moving unit, the lens moving unit comprising:

a first lens moving unit including a bobbin mounted at an inner side with at least one lens and formed at a periphery with a first coil, and a housing configured to support a magnet arranged at a surrounding of the bobbin to move the bobbin and the first coil to a first direction parallel with an optical axis in response to interaction between the magnet and the first coil; and

a second lens moving unit including a base spaced apart at a predetermined distance from the bobbin and the first lens moving unit, a support member configured to movably support the first lens moving unit to second and third directions relative to the base and to supply an electric power to the first coil, and a circuit board including a detection sensor configured to detect positions of the second and third directions of the second lens moving unit relative to a second coil and the base opposite to the magnet of the first lens moving unit to thereby move an entire first lens moving unit including the bobbin to the mutually different second and third directions which is perpendicular to the optical axis in response to the interaction between the magnet and the second coil.

2. The lens moving unit of claim 1, further comprising a cover member configured to encompass the first and second lens moving units by being coupled to the base.

3. The lens moving unit of claim 2, wherein the bobbin includes a first stopper protrusively formed at an upper surface with a first height, and a second stopper protrusively formed at a lateral surface of an upper surface to a circumferential direction, wherein the first stopper prevents an inner surface of the cover member from colliding with a bobbin body, and the second stopper prevents the bobbin from colliding with the base.

4. The lens moving unit of claim 2, wherein the housing includes a first surface mounted with four magnets, a second surface configured to interconnect with the first surface and arranged with the support member, a third stopper protrusively formed from an upper surface to prevent interference with the cover member, and a fourth stopper protrusively formed from a floor surface to prevent interference with the base.

5. The lens moving unit of claim 4, wherein the second surface includes an escape groove to prevent the support member from interfering with the housing.

6. The lens moving unit of claim 5, wherein the second surface further includes a staircase unit formed at an upper side of the escape groove.

7. The lens moving unit of claim 5, wherein the second surface further includes a diaphragm configured to accommodate damping silicon.

11. The lens moving unit of claim 1, wherein the first lens moving unit includes an octagonal bobbin having at least four straight surfaces and corner surfaces configured to connect the at least four straight surfaces, a first coil wound on a periphery of the bobbin, a magnet arranged at a position opposite to the straight surface of the first coil, a housing fixed by the magnet, and upper and bottom elastic members, an inner frame of which is coupled to the bobbin and an outer frame of which is coupled to the housing.

12. The lens moving unit of claim 1, wherein the housing includes a recess groove having a size corresponding to that of the second stopper at a position opposite to that of the second stopper.

13. The lens moving unit of claim 1, wherein the support member is integrally formed with the upper elastic member.

14. The lens moving unit of claim 13, wherein the support member includes a connection unit connected to the upper elastic member, first and second elastic deformation units extensively formed from the connection unit, and a fixation unit fixedly coupled to the base.

15. The lens moving unit of claim 14, wherein at least four support members are provided to support the second lens moving unit, and at least two support members further include terminal units each having a different polarity.

16. The lens moving unit of claim 14, wherein the support member is interposed between the first and second elastic deformation units and further includes a damping connection unit formed in a space formed by the diaphragm.

17. The lens moving unit of claim 16, wherein upper side and bottom side shapes of the first and second elastic deformation units mutually correspond, while the first and second elastic deformation units are interposed between the damping connection unit.

18. The lens moving unit of claim 16, wherein each of the first and second elastic deformation units takes a shape of a wire free from pattern.

19. The lens moving unit of claim 14, wherein the fixation unit is wider than each width of the first and second elastic deformation units.

20. The lens moving unit of claim 1, wherein the base is concavely formed with a support member recess groove at a position opposite to that of the support member.

21. The lens moving unit of claim 20, wherein the support member recess groove is formed at four corner areas of the base.

22. The lens moving unit of claim 1, wherein the second coil is formed at an upper surface of the circuit board mounted at an upper side of the base.

23. The lens moving unit of claim 1, wherein the second coil is provided at an upper surface of the circuit board mounted at an upper surface of the base with a substrate having a pattern coil, and coupled to the circuit board in the form of lamination.

24. The lens moving unit of claim 1, wherein the second coil is integrally formed at an upper surface of the base in the form of a surface electrode.

25. The lens moving unit of claim 1, wherein the detection sensor is any one of a Hall sensor aligned with a center of the second coil and insertedly coupled to a detection sensor recess groove formed at the base and a photo reflector.

34. A camera module, the camera module comprising:

an image sensor;

a PCB mounted with the image sensor; and

a lens moving unit in accordance with claim 1.

8. A lens moving unit, the lens moving unit comprising:

a first lens moving unit including a bobbin mounted at an inner side with at least one lens and formed at a periphery with a first coil, and a housing configured to support a magnet arranged at a surrounding of the bobbin to move the bobbin and the first coil to a first direction parallel with an optical axis in response to interaction between the magnet and the first coil;

a second lens moving unit including a base spaced apart at a predetermined distance from the housing, a support member configured to movably support the first lens moving unit to second and third directions relative to the base and to supply an electric power to the first coil, a second coil arranged opposite to the magnet of the first lens moving unit, and a circuit board including a detection sensor configured to detect a position of the first direction of the housing relative to the base by detecting a sensing magnet mounted on the first lens moving unit and changes in magnetic field of the sensing magnet to thereby move the housing to the mutually different second and third directions which is perpendicular to the optical axis in response to the interaction between the magnet and the second coil; and

a cover member configured to encompass the first and second lens moving units by being coupled to the base.

9. The lens moving unit of claim 8 further comprising a second detection sensor configured to detect positions of the second and third directions.

10. The lens moving unit of claim 8, wherein the second coil includes a plurality of circuit boards coupled to an inner lateral wall of the cover member.

26. The lens moving unit of claim 8, wherein a total of two detection sensors are provided, where each imaginary line connecting a center of the base to each center of the detection sensors is perpendicularly arranged.

27. The lens moving unit of claim 8, wherein the magnet is dual-purposely used as an auto focusing magnet configured to move the bobbin to the first direction and as a handshake correction magnet configured to move the housing to the second and third directions.

28. The lens moving unit of claim 8, wherein the second coil is formed at an inner surface of the circuit board mounted at an inner lateral surface of the cover member.

29. The lens moving unit of claim 8, wherein the second coil is provided at an upper surface of the circuit board mounted at an inner lateral surface of the cover member with a substrate having a pattern coil, and is coupled to the circuit board in the form of lamination.

30. The lens moving unit of claim 8, wherein the second coil is integrally formed at an inner lateral surface of the cover member in the form of a surface electrode.

31. The lens moving unit of claim 9, wherein the second detection sensor is any one of a Hall sensor aligned with a center of the second coil and insertedly coupled to a detection sensor recess groove formed at the base and a photo reflector.

32. The lens moving unit of claim 8, wherein the sensing magnet is arranged at an upper surface of the first lens moving unit.

33. The lens moving unit of claim 32, wherein at least one sensing magnet is arranged at a corner area of the upper surface of the bobbin.