Lens driving device

• US 10,268,047 B2
• Filed: 02/28/2017
• Issued: 04/23/2019
• 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:
  US15/445,161
• Publication Number:
  US 20170168315A1
• Time in Patent Office: 784 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 cover can comprising an upper plate and a side plate extending from the upper plate;

a base coupled to the cover can;

a housing spaced apart from the base and disposed in the cover can;

a bobbin disposed in the housing;

a first coil unit disposed on the bobbin;

a second coil unit disposed on the base,

a magnet unit disposed on the housing;

a substrate disposed between the second coil unit and the base; and

a first elastic unit coupled to the bobbin and the housing, wherein the first elastic unit comprises an upper spring disposed on an upper portion of the housing and a lower spring disposed at a lower portion of the housing;

a second elastic unit connected to the upper spring; and

a hall sensor unit disposed on a lower surface of the substrate;

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

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

wherein the hall sensor unit is disposed in the first groove of the base, and

wherein the bobbin comprises at least two flange units protrusively formed at an outer surface thereof, and the housing comprises mounting portions at an inner side surface corresponding to the flange units, respectively, and

wherein the magnet unit is disposed in the corner of the housing.

2. The device of claim 1, wherein the housing comprises at least two first upper stoppers protruding from an upper surface thereof, wherein the bobbin comprises at least two second upper stoppers protruding from an upper surface thereof.

3. The device of claim 2, wherein the housing further comprises at least two first lower stoppers protruding from a lower surface of the housing.

4. The device of claim 2, wherein the first upper stoppers are respectively disposed at corners of the housing when viewed from top.

5. The device of claim 2, wherein the first coil unit faces an inner side surface of the magnet unit in a horizontal direction, and the second coil unit faces a lower surface of the magnet unit in a vertical direction.

6. The device of claim 5, wherein the second coil unit is either a patterned coil or multiple separate coil elements.

7. The device of claim 2, wherein the second elastic unit is disposed between the upper spring and the substrate.

8. The device of claim 7, wherein the second elastic unit is disposed between one corner of the housing and adjacent corner of the housing.

9. The device of claim 8, wherein the second elastic unit comprises at least four second elastic units.

10. The device of claim 7, wherein the upper spring comprises a first upper spring electrically connected to an end of a coil wound on the first coil unit, and a second upper spring electrically connected to the other end of the coil wound on the first coil unit, and wherein the first upper spring and the second upper spring are electrically connected to the substrate through the second elastic unit.

11. The device of claim 7, wherein the upper spring and the lower spring are a leaf spring.

12. The device of claim 11, wherein the second elastic unit is a leaf spring.

13. The device of claim 2, wherein the magnet unit comprises a first magnet facing the first coil unit and a second magnet facing the second coil unit.

14. The device of claim 1, wherein the hall sensor unit disposed on the lower surface of the substrate is configured to detect a movement of the magnet unit.

15. The device of claim 1, wherein at least a portion of the solder ball is disposed in the second groove of the base.

16. The device of claim 1, wherein the magnet unit comprises four magnets disposed at an angle of 90°

, and the hall sensor unit comprises two hall sensors disposed on a straight line along with the magnet unit in an optical axis direction and disposed to be opposite to neighboring magnets.

17. The device of claim 1, wherein the substrate comprises at least one terminal extended in the optical axis direction to supply electric power to the first and second coil units.

18. The device of claim 1, wherein the housing further comprises at least one first upper side engaging protrusion protruding from the upper surface thereof,

wherein the bobbin further comprises at least one second upper surface engaging protrusion protruding from the upper surface thereof, and

wherein the upper spring comprises an outer portion having an outer engaging groove matching the upper side engaging protrusion of the housing, an inner portion having an inner engaging groove matching the upper surface engaging protrusion of the bobbin, and a connection portion connecting the outer portion and the inner portion.

19. The device of claim 1, wherein the first coil unit faces an inner side surface of the magnet unit in a horizontal direction, and the second coil unit faces a lower surface of the magnet unit in a vertical direction.

20. The device of claim 19, wherein the second coil unit is either a patterned coil or multiple separate coil elements.

21. The device of claim 1, wherein the second elastic unit is disposed between one corner of the housing and adjacent corner of the housing.

22. The device of claim 21, wherein the second elastic unit comprises at least four second elastic units.

23. The device of claim 1, wherein the upper spring comprises a first upper spring electrically connected to an end of a coil wound on the first coil unit, and a second upper spring electrically connected to an other end of the coil wound on the first coil unit, and wherein the first upper spring and the second upper spring are electrically connected to the substrate through the second elastic unit.

24. The device of claim 1, wherein the upper spring and the lower spring are each a leaf spring.

25. The device of claim 1, wherein the second elastic unit is a leaf spring.

26. The device of claim 1, wherein the magnet unit comprises a first magnet facing the first coil unit and a second magnet facing the second coil unit.

27. The device of claim 1, wherein the housing comprises at least two first upper stoppers protruding from an upper surface thereof and at least two first lower stoppers protruding from a lower surface thereof.

28. The device of claim 27, wherein the first upper stoppers and the first lower stoppers are disposed on a straight line about the optical axis direction and are positioned close to a magnet unit.

29. The device of claim 27, wherein the first upper stoppers are respectively disposed at corners of the housing when viewed from top.

30. The device of claim 27, wherein the housing further comprises at least one first upper side engaging protrusion protruding from the upper surface thereof,

wherein the bobbin further comprises at least one second upper surface engaging protrusion protruding from the upper surface thereof, and

wherein the upper spring comprises an outer portion having an outer engaging groove matching the upper side engaging protrusion of the housing, an inner portion having an inner engaging groove matching the upper surface engaging protrusion of the bobbin and a connection portion connecting the outer portion and the inner portion.

31. A camera, comprising;

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

a base coupled to the cover can;

a housing spaced apart from the base and disposed in the cover can;

a bobbin disposed in the housing;

a lens coupled to the bobbin;

a first coil unit disposed on the bobbin;

a second coil unit disposed on the base,

a magnet unit disposed on the housing;

a substrate disposed between the second coil unit and the base;

an image sensor disposed below the substrate;

a first elastic unit coupled to the bobbin and the housing, wherein the first elastic unit comprises an upper spring disposed on an upper portion of the housing and a lower spring disposed at a lower portion of the housing; and

a second elastic unit disposed between the upper spring and the substrate;

wherein the housing comprises at least two first upper stoppers protruding from an upper surface thereof and at least two first lower stoppers protruding from a lower surface thereof,

wherein the bobbin comprises at least two second upper stoppers protruding from an upper surface thereof; and

wherein the bobbin comprises at least two flange units protrusively formed at an outer surface thereof, and the housing comprises mounting portions at an inner side surface corresponding to the flange units, respectively, and

wherein the magnet unit is disposed in the corner of the housing.