Lens driving device

• US 10,598,954 B2
• Filed: 03/11/2019
• Issued: 03/24/2020
• Est. Priority Date: 05/29/2013
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Yeo, In Jae
• Primary Examiner(s): Chapel, Derek S.
• Application Number:
  US16/298,528
• Publication Number:
  US 20190204616A1
• Time in Patent Office: 379 Days
• Field of Search: None
• CPC Class Codes: G02B 13/001 Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras G02B23/243 takes precedence
• 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 7/02 for lenses supports for magnifying lenses G02B25/002
• CPC Class Codes: G02B 7/04 with mechanism for focusing or varying magnification
• CPC Class Codes: G02B 7/09 adapted for automatic focusing or varying magnification
• 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: G03B 3/10 Power-operated focusing
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing
• CPC Class Codes: H02K 41/0356 moving along a straight path

Abstract

A lens driving device is proposed, including a cover can whose upper side surface includes an opening formed to expose a lens and whose side surface extends from the upper side surface to a base, a base that is secured to the cover can; a housing that is arranged on top of the base and moves in first and second directions that are perpendicular to an optical axis, a bobbin that is housed in the housing and moves in an optical axis direction, an actuator that includes a magnet unit arranged in the housing, a first coil unit arranged in an outer side surface of the bobbin, and a second coil unit that is arranged on top of the base, and a substrate that is disposed between the second coil unit and the base so as to control the first coil unit and the second coil unit.

Claims

1. A lens driving device, comprising:

a housing;

a bobbin disposed in the housing;

a first coil disposed on an outer peripheral surface of the bobbin;

a magnet disposed on the housing and facing the first coil;

a base disposed under the housing;

a substrate disposed on an upper surface of the base;

a second coil disposed on an upper surface of the substrate and facing the magnet;

an upper elastic member connecting the housing and the bobbin; and

a lateral elastic member connecting the upper elastic member and the substrate,

wherein the bobbin comprises two ribs protruding from the outer peripheral surface of the bobbin and a flange unit that protrudes more than the two ribs from the outer peripheral surface of the bobbin,

wherein at least a portion of the first coil is disposed between the two ribs of the bobbin,

wherein the housing comprises a mounting unit overlapped with the flange unit of the bobbin in a direction parallel to an optical axis, and

wherein a downward movement of the bobbin is limited by the flange unit and the mounting unit.

2. The lens driving device of claim 1, wherein the two ribs are overlapped with the first coil in the direction parallel to the optical axis, and

wherein the two ribs comprise a first rib disposed above the first coil and a second rib disposed below the first coil.

3. The lens driving device of claim 2, wherein the first rib is parallel to the second rib.

4. The lens driving device of claim 1, wherein the first coil comprises a first part disposed between the two ribs of the bobbin, and

wherein the flange unit of the bobbin is disposed at a position further upward than that of the first part of the first coil.

5. The lens driving device of claim 1, wherein the mounting unit is recessedly formed from an inner lateral surface of the housing and an upper surface of the housing, and

wherein at least a portion of the flange unit of the bobbin is disposed in the mounting unit of the housing.

6. The lens driving device of claim 5, wherein the downward movement of the bobbin is limited by a contact between the flange unit and a bottom surface of the mounting unit, and

wherein a rotation of the bobbin is limited by the flange unit and the mounting unit.

7. The lens driving device of claim 5, wherein the mounting unit of the housing comprises a bottom surface facing a lower surface of the protrusion of the bobbin.

8. The lens driving device of claim 7, wherein the bottom surface of the mounting unit of the housing is parallel to the lower surface of the protrusion of the bobbin.

9. The lens driving device of claim 5, wherein the flange unit of the bobbin comprises four flange units, and

wherein the mounting unit of the housing comprises four grooves corresponding with the four flange units.

10. The lens driving device of claim 9, wherein the four grooves of the housing are disposed at four corners of the housing, respectively.

11. The lens driving device of claim 1, comprising:

a cover comprising an upper plate and a lateral plate extending from the upper plate,

wherein the lateral plate of the cover is coupled to the base,

wherein the bobbin comprises a stopper protruding from an upper surface of the bobbin, and

wherein the stopper of the bobbin is overlapped with the upper plate of the cover in the direction parallel to the optical axis.

12. The lens driving device of claim 1, wherein the upper elastic member comprises two upper elastic members spaced apart from each other,

wherein the lateral elastic member comprises two lateral elastic members, and

wherein the first coil is electrically connected with the substrate through the two upper elastic members and the two lateral elastic members.

13. The lens driving device of claim 1, wherein the flange unit of the bobbin is overlapped with the housing in a direction perpendicular to the optical axis.

14. The lens driving device of claim 1, comprising:

a lower elastic member disposed below the upper elastic member and connecting the housing and the bobbin, and

wherein the lower elastic member is integrally formed.

15. The lens driving device of claim 1, wherein the outer peripheral surface of the bobbin comprises a first surface on which the first coil is wound, and

wherein the two ribs of the bobbin outwardly protrude from the first surface of the outer peripheral surface of the bobbin.

16. The lens driving device of claim 1, comprising:

a hall sensor disposed on a lower surface of the substrate,

wherein the second coil is connected to the substrate by a solder ball,

wherein the base comprises a first groove corresponding to the hall sensor and a second groove corresponding to the solder ball, and

wherein the hall sensor is disposed in the first groove, and the solder ball is disposed in the second groove.

17. The lens driving device of claim 1, comprising:

a further substrate disposed on the upper surface of the substrate,

wherein the second coil is formed as a patterned coil on the further substrate.

18. A camera module, comprising:

a printed circuit board;

an image sensor disposed on the printed circuit board;

the lens driving device of claim 1; and

a lens coupled to the bobbin of the lens driving device and spaced apart from the image sensor.

19. A mobile phone comprising the camera module of claim 18.

20. The lens driving device of claim 1, wherein a portion of the housing is disposed between the magnet and the flange unit of the bobbin in the direction parallel to the optical axis.

21. A lens driving device, comprising:

a cover can comprising an upper plate and a side plate extending from the upper plate;

a housing disposed in the cover can;

a bobbin disposed in the housing;

a first coil disposed on an outer peripheral surface of the bobbin;

a magnet disposed on the housing and facing the first coil;

a base disposed under the housing and coupled with the side plate of the cover can;

a substrate disposed on an upper surface of the base;

a second coil disposed on an upper surface of the substrate and facing the magnet;

an upper spring connecting the housing and the bobbin; and

a side spring connecting the upper spring and the substrate,

wherein the bobbin comprises a rib protruding from the outer peripheral surface of the bobbin and a flange unit that protrudes more than the rib from the outer peripheral surface of the bobbin,

wherein the housing comprises a groove formed on an upper surface of the housing,

wherein at least a portion of the flange unit of the bobbin is disposed in the groove of the housing,

wherein the groove of the housing is opened toward the bobbin,

wherein a downward movement of the bobbin is limited by the flange unit of the bobbin and the groove of the housing.

22. The lens driving device of claim 21, wherein the rib is overlapped with the first coil in a direction parallel to an optical axis,

wherein the rib comprises a first rib disposed above the first coil and a second rib disposed below the first coil.

23. The lens driving device of claim 21, wherein the first coil comprises a first part wound on the outer peripheral surface of the bobbin, and

wherein the flange unit of the bobbin is disposed at a position further upward than that of the first part of the first coil.

24. The lens driving device of claim 21,

wherein the flange unit of the bobbin is contacted to the housing when the bobbin is rotated.

25. The lens driving device of claim 21, wherein the groove of the housing comprises a bottom surface facing a lower surface of the flange unit of the bobbin, and

wherein at least a portion of the bottom surface of the groove of the housing is configured to contact with the lower surface of the flange unit of the bobbin when the bobbin downwardly moves.