Lens driving device and camera module including the same

• US 9,151,965 B2
• Filed: 01/30/2015
• Issued: 10/06/2015
• Est. Priority Date: 08/23/2013
• Status: Active Grant

• Current Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Original Assignee: Samsung Electro-Mechanics Co., Ltd. (Samsung Group)
• Inventors: Lim, Soo Cheol, Kim, Chul Jin, Lee, Jae Hyuk, Park, Sung Ryung
• Primary Examiner(s): Perkey, W B
• Application Number:
  US14/609,849
• Publication Number:
  US 20150138639A1
• Time in Patent Office: 249 Days
• US Class Current: 1/1
• 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 7/022 lens and mount having complementary engagement means, e.g. screw/thread
• CPC Class Codes: G02B 7/09 adapted for automatic focusing or varying magnification
• CPC Class Codes: G02B 7/102 controlled by a microcomputer cameras with interchangeable lenses G03B17/14
• CPC Class Codes: G03B 13/36 Autofocus systems
• 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: H04N 23/54 Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/57 Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

A lens driving device includes a lens barrel supporting a lens; an autofocusing driving unit disposed on one side of a plane perpendicular to an optical axis direction based on the lens barrel to thereby drive the lens barrel in the optical axis direction; and a hand-shake prevention driving unit disposed on sides of the plane perpendicular to the optical axis direction other than the one side on which the autofocusing driving unit is disposed, to thereby drive the lens in a direction perpendicular to the optical axis direction.

Claims

1. A lens driving device, comprising:

a lens barrel supporting a lens;

an autofocus driving unit disposed on one side of a plane perpendicular to an optical axis direction based on the lens barrel to thereby drive the lens barrel in the optical axis direction;

a hand-shake prevention driving unit disposed on sides of the plane perpendicular to the optical axis direction other than the one side on which the autofocus driving unit is disposed, to thereby drive the lens in a direction perpendicular to the optical axis direction; and

a main frame in which the lens barrel is moveably disposed,

wherein the autofocus driving unit comprises a first magnet is disposed on one side of the lens barrel and a first coil is disposed on one side of the main frame corresponding to one side of the lens barrel, or vice versa,

wherein the first coil and the first magnet are disposed to face each other at a position of an opening formed in the main frame,

wherein one side of the main frame is provided with a first flexible printed circuit board (FPCB) for mounting the first coil, and

wherein the first FPCB is extended from one side of the main frame to at least one of the other two sides of the main frame to thereby provide a driving current to the hand-shake prevention driving unit.

2. The lens driving device of claim 1, wherein the hand-shake prevention driving unit is disposed on three sides of the plane perpendicular to the optical axis direction.

3. The lens driving device of claim 1, wherein the hand-shake prevention driving unit includes coils and magnets disposed on two or three sides of the plane perpendicular to the optical axis direction, and

the coils and the magnets face each other on the plane perpendicular to the optical axis direction.

4. The lens driving device of claim 1, wherein the hand-shake prevention driving unit is disposed on two sides on the plane perpendicular to the optical axis direction.

5. The lens driving device of claim 1, further comprising:

an optical image stabilization (OIS) mounting frame disposed to correspond to the main frame in the optical axis direction; and

a shield case allowing the main frame and the OIS mounting frame to be disposed therein.

6. The lens driving device of claim 1, wherein

a first hall sensor sensing a magnetic flux change of the first magnet is disposed inside a winding of the first coil or is disposed to be adjacent to the first coil outside the first coil.

7. The lens driving device of claim 6, wherein the first hall sensor is provided as a single chip together with a driver IC for driving the autofocus driving unit.

8. The lens driving device of claim 7, wherein the first hall sensor is disposed above and below the driver IC or is disposed above the driver IC or below the driver IC in the optical axis direction.

9. The lens driving device of claim 1, wherein the first FPCB is disposed on one side of the main frame.

10. The lens driving device of claim 1, further comprising a ball member disposed on a surface of the lens barrel facing the main frame and facilitating a movement of the lens barrel in the optical axis direction.

11. The lens driving device of claim 10, wherein the ball member is disposed on upper and lower portions of the outer surface of the lens barrel facing the main frame, based on the autofocus driving unit;

the lens barrel and the main frame are provided with respective guide parts regulating a movement range of the ball member; and

a shape of one guide part is different from that of the other guide part.

12. The lens driving device of claim 11, wherein one guide part is provided as a V-like groove or an U-like groove, and

the other guide part includes a flat surface or a flat surface connected to an inclined portion.

13. The lens driving device of claim 1, wherein second magnets or second coils are disposed above or below the main frame based on the plane perpendicular to the optical axis direction, and

the second magnets are disposed to face the second coils in the optical axis direction.

14. The lens driving device of claim 13, wherein when the hand-shake prevention driving unit includes the three second magnets and the three second coils disposed on three sides of the plane perpendicular to the optical axis direction, the second magnets are longer than the second coils to cover the second coils and a second hall sensor disposed to be adjacent to the second coils when viewed in the optical axis direction.

15. The lens driving device of claim 14, wherein one of the three second coils is longer than at least one of the other two coils.

16. The lens driving device of claim 14, wherein one of the three second coils has a length longer than a sum of lengths of the other two coils.

17. The lens driving device of claim 14, wherein one second coil facing the autofocus driving unit among the three second coils has a length longer than that of at least one of the other two coils adjacent to the autofocus driving unit.

18. A camera module comprising:

the lens driving device of claim 1; and

an image sensor disposed to correspond to the lens of the lens driving device.

19. The camera module of claim 18, further comprising:

an optical image stabilization (OIS) mounting frame disposed to correspond to the main frame in the optical axis direction; and

a shield case allowing the main frame and the OIS mounting frame to be disposed therein,

wherein a first magnet is disposed on one side of the lens barrel and a first coil is disposed on one side of the main frame corresponding to one side of the lens barrel, or vice versa, and

second magnets are disposed on two sides or three sides of the OIS mounting frame and second coils are disposed on two sides or three sides of the main frame corresponding to the two sides or the three sides of the OIS mounting frame in the optical axis direction, based on the plane perpendicular to the optical axis direction, or vice versa.