Lens driving device, camera module and optical apparatus

• US 10,520,699 B2
• Filed: 01/19/2016
• Issued: 12/31/2019
• Est. Priority Date: 01/16/2015
• Status: Active Grant

• Current Assignee: LG Innotek Company Limited (LG Corporation)
• Original Assignee: LG Innotek Company Limited (LG Corporation)
• Inventors: Park, Tae Bong, Lee, Hee Se, Han, Jin Suk
• Primary Examiner(s): Pasko, Nicholas R.
• Application Number:
  US15/000,613
• Publication Number:
  US 20160209672A1
• Time in Patent Office: 1,442 Days
• Field of Search: 359554, 359557, 359694, 359811, 359814, 359819, 359822-824, 310 1216, 257684, 3482084, 3482085, 34820811, 3482082, 3482087, 34820899, 348335, 348345, 348373, 348374, 348 E5024, 348 E5046, 396 52, 396 55, 396133, 396529
• 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 7/023 permitting adjustment
• CPC Class Codes: G02B 7/026 using retaining rings or springs G02B7/027 takes precedence
• CPC Class Codes: G02B 7/028 with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
• 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: G02B 7/09 adapted for automatic focusing or varying magnification
• CPC Class Codes: G02B 7/10 by relative axial movement of several lenses, e.g. of varifocal objective lens
• CPC Class Codes: G02B 7/102 controlled by a microcomputer cameras with interchangeable lenses G03B17/14
• CPC Class Codes: G02B 7/105 with movable lens means specially adapted for focusing at close distances
• CPC Class Codes: H05K 1/0281 Reinforcement details thereof
• CPC Class Codes: H05K 1/118 specially for flexible printed circuits, e.g. using folded portions
• CPC Class Codes: H05K 3/281 by means of a preformed insulating foil H05K3/284 takes precedence

Abstract

A lens driving device is provided, including: a holder member; a first driving unit disposed at the holder member; a base disposed at a lower side of the holder member and spaced apart from the holder member; a first circuit board disposed at an upper surface of the base; a second circuit board including a second driving unit facing the first driving unit, and disposed at an upper surface of the first circuit board; a support member supporting the holder member with respect to the base; and a guide portion protruded from an upper surface of the base, wherein the guide portion supports the second circuit board. In an embodiment, a coil at the second circuit board and a magnet at the holder member may be assembled at a predetermined interval, such that reliability of the product with respect to performance of handshake compensation device can be enhanced.

Claims

1. A lens driving device, comprising:

a holder member;

a bobbin disposed in the holder member;

a first coil disposed on the bobbin;

a magnet disposed on the holder member and facing the first coil;

an elastic member coupled to the bobbin and the holder member;

a base disposed below the holder member and spaced apart from the holder member;

a first circuit board disposed on an upper surface of the base, wherein the first circuit board comprises a flexible circuit board;

a second circuit board disposed on an upper surface of the first circuit board and comprising a second coil facing the magnet, wherein the second circuit board is disposed between the holder member and the base;

a support member supporting the holder member with respect to the base; and

a guide portion protruding from the upper surface of the base,

wherein the first circuit board is electrically connected with the second coil,

wherein the guide portion penetrates the first circuit board and is in contact with a lower surface of the second circuit board,

wherein the guide portion is integrally formed with the base,

wherein the base comprises an opening penetrating the base in a vertical direction, and

wherein the guide portion comprises a first guide portion extending from an inner circumferential surface of the base and a second guide portion extending from an outer circumferential surface of the base,

wherein a protruded height of the second guide portion corresponds to a protruded height of the first guide portion,

wherein the first circuit board comprises a first guide groove formed on the inner circumferential surface, the first guide portion penetrates the first guide groove and an upper surface of the first guide portion is in contact with an inner portion of the lower surface of the second circuit board,

wherein the first circuit board is disposed in the second guide portion and an upper surface of the second guide portion is in contact with an outer portion of the lower surface of the second circuit board,

wherein the protruded height of the first guide portion corresponds to a thickness of the first circuit board in the vertical direction,

wherein at least a portion of the upper surface of the first circuit board is in contact with the lower surface of the second circuit board,

wherein the second coil is overlapped with the magnet in the vertical direction and disposed between the magnet and the base,

wherein the second guide portion comprises a plurality of second guide portions protruding from the outer circumferential surface of the base so as to be disposed around an outer circumference of the first circuit board,

wherein the first circuit board comprises a first connecting portion,

wherein the second circuit board comprises a second connecting portion disposed at a position corresponding to that of the first connecting portion and conductively connected with the first connecting portion,

wherein the first connecting portion and the second connecting portion are connected to each other by a solder ball,

wherein the base comprises a grooved portion formed on the upper surface of the base and accommodating the solder ball, and

wherein the grooved portion is formed by being recessed from the outer circumferential surface of the base.

2. The lens driving device of claim 1, wherein the first circuit board is not overlapped with the second guide portion in a vertical direction.

3. The lens driving device of claim 1, wherein the support member is conductively connected with at least one of the first connecting portion and the second connecting portion.

4. The lens driving device of claim 1, wherein

the first circuit board is fixed by being adhered to an epoxy disposed at the grooved portion.

5. The lens driving device of claim 1,

wherein the elastic member comprises an upper elastic member coupled to an upper portion of the holder member and an upper portion of the bobbin, and

a lower elastic member coupled to a lower portion of the holder member and a lower portion of the bobbin.

6. The lens driving device of claim 5, comprising:

a sensing magnet disposed on a lateral surface of the bobbin;

a correction magnet disposed on another lateral surface of the bobbin, and establishing magnetic force equilibrium with the sensing magnet; and

a position detection sensor disposed on the holder member, and configured to detect the sensing magnet.

7. The lens driving device of claim 1, wherein the first guide portion is in contact with an inner edge of the lower surface of the second circuit board, and the second guide portion is in contact with an outer edge of the lower surface of the second circuit board.

8. The lens driving device of claim 1, wherein the first guide portion comprises eight first guide protrusions spaced apart from each other, and

wherein the eight first guide protrusions are symmetrically disposed with respect to a center axis of the base.

9. The lens driving device of claim 1, wherein the outer circumferential surface of the base comprises first and second surfaces opposite to each other, and third and fourth surfaces opposite to each other and being disposed between the first and second surfaces,

wherein the second guide portion is disposed on the first and second surfaces, and

wherein the second guide portion is not disposed on the third and fourth surfaces.

10. The lens driving device of claim 1, wherein the second coil is overlapped with the magnet in the vertical direction, and

wherein the second coil is disposed below the magnet.

11. The lens driving device of claim 1, wherein the second coil is disposed between the magnet and the base.

12. The lens driving device of claim 1, wherein the second circuit board is disposed between the holder member and the base.

13. The lens driving device of claim 1, wherein the second guide portion comprises a plurality of second guide portions protruding from the outer circumferential surface of the base so as to be disposed around an outer circumference of the first circuit board.

14. The lens driving device of claim 1, wherein an upper surface of the guide portion surface contacts the lower surface of the second circuit board.

15. The lens driving device of claim 14, wherein

the first guide portion comprises a plurality of first guide protrusions, and

the plurality of first guide protrusions is arranged along the inner circumferential surface of the base by being spaced apart from each other.

16. A camera module, comprising:

the lens driving device of claim 1;

a lens coupled with the bobbin of the lens driving device;

a printed circuit board disposed below the base; and

an image sensor disposed on the printed circuit board and disposed at a position corresponding to that of the lens.

17. An optical apparatus, comprising the camera module of claim 16.