Lens driving device and camera module including the same

• US 9,372,352 B2
• Filed: 06/20/2014
• Issued: 06/21/2016
• 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:
  US14/311,210
• Publication Number:
  US 20150055220A1
• Time in Patent Office: 732 Days
• Field of Search: 396/55, 396/133, 348/208.11, 348/345, 359/557, 359/824
• 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 main frame;

a lens barrel movably disposed in the main frame and configured to support a lens;

an autofocus driving unit configured to drive the lens barrel in an optical axis direction based on the lens barrel, including a first magnet and a first coil both disposed at a first side of a four-sided reference plane perpendicular to the optical axis direction;

a hand-shake prevention driving unit disposed at sides of the reference plane other than said first side thereof and configured to drive the lens in a direction perpendicular to the optical axis direction;

an optical image stabilization (OIS) mounting frame aligned with the main frame in the optical axis direction; and

a shield case configured to accommodate the main frame and the OIS mounting frame therein.

2. The lens driving device of claim 1, wherein:

the first magnet is disposed on the lens barrel, and

the first coil is disposed on the main frame, or vice versa.

3. The lens driving device of claim 2, wherein the first coil and the first magnet are disposed adjacent to an opening formed in the main frame.

4. The lens driving device of claim 2,

wherein a first side of the main frame, which corresponds to the first side of the reference plane, is provided with a first flexible printed circuit board (FPCB) configured to mount the first coil, and

wherein a first hall sensor configured to sense 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.

5. The lens driving device of claim 4, wherein the first hall sensor is provided as a single chip together with a driver integrated circuit (IC) configured to drive the autofocus driving unit.

6. The lens driving device of claim 5, 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.

7. The lens driving device of claim 4, wherein the first FPCB is extended from the first side of the main frame to at least one adjacent side of the main frame, and is configured to provide a driving current to the hand-shake prevention driving unit.

8. The lens driving device of claim 4, wherein the first FPCB is disposed only on the first side of the main frame.

9. 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.

10. The lens driving device of claim 9,

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;

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

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

11. The lens driving device of claim 10,

wherein one guide part is provided as a V-like groove or an U-like groove, and

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

18. The lens driving device of claim 1,

wherein the hand-shake prevention driving unit includes sets of second magnets and second coils disposed above or below the main frame with reference to the optical axis direction, and

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

19. The lens driving device of claim 18,

wherein the hand-shake prevention driving unit includes three sets of second magnets and second coils disposed at three sides of the reference plane other than said first side thereof, and

wherein the second magnets are longer than the second coils in order to cover the second coils, and second hall sensors are disposed adjacent to respective second coils when viewed in the optical axis direction.

20. The lens driving device of claim 19, wherein one of the three second coils is longer than at least one of the other two second coils.

21. The lens driving device of claim 19, wherein one of the three second coils is longer than the sum of the lengths of the other two second coils.

22. The lens driving device of claim 19, wherein one second coil faces the autofocus driving unit and is longer than at least one of the other two second coils adjacent to the autofocus driving unit.

12. A lens driving device, comprising:

a main frame;

a lens barrel movably disposed in the main frame and configured to support a lens;

an autofocus driving unit configured to drive the lens barrel in an optical axis direction based on the lens barrel, including a first magnet and a first coil both disposed at a first side of a four-sided reference plane perpendicular to the optical axis direction;

a hand-shake prevention driving unit disposed at sides of the reference plane other than said first side thereof and configured to drive the lens in a direction perpendicular to the optical axis direction;

a separate frame having an opening and coupled to a side of the main frame; and

a yoke configured to cover the opening in the separate frame;

wherein the first magnet is disposed on the lens barrel, and the first coil is disposed on the separate frame, or vice versa.

13. The lens driving device of claim 12, wherein the opening in the separate frame receives a first flexible printed circuit board (FPCB) coupled to the yoke, and the first coil and a first hall sensor are coupled to the first FPCB.

14. The lens driving device of claim 13, wherein the first hall sensor is provided as a single chip together with a driver integrated circuit (IC) configured to drive the autofocus driving unit.

15. The lens driving device of claim 14, 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.

16. The lens driving device of claim 13, wherein the first FPCB is disposed on one side of the separate frame, and is configured to provide a driving current to the hand-shake prevention driving unit.

17. The lens driving device of claim 12, wherein the first coil includes a winding coil or a multilayer coil board.

23. A camera module comprising:

a main frame;

a lens barrel movably disposed in the main frame and configured to support a lens;

an autofocus driving unit configured to drive the lens barrel in an optical axis direction based on the lens barrel, including a first magnet and a first coil both disposed at a first side of a four-sided reference plane perpendicular to the optical axis direction, the first magnet disposed on the lens barrel and the first coil disposed on the main frame, or vice versa;

a hand-shake prevention driving unit disposed at three sides of the reference plane other than said first side thereof and configured to drive the lens in a direction perpendicular to the optical axis direction;

an image sensor aligned with the lens barrel along the optical axis;

an optical image stabilization (OIS) mounting frame aligned with the main frame in the optical axis direction; and

a shield case configured to accommodate the main frame and the OIS mounting frame therein;

wherein the hand-shake prevention driving unit includes at least two second magnets disposed on at least two sides of the OIS mounting frame, and at least two corresponding second coils disposed on at least two sides of the main frame adjacent to the at least two sides carrying the second magnets, or vice versa.

24. The camera module of claim 23,

wherein the hand-shake prevention driving unit includes three second magnets disposed on three sides of the OIS mounting frame and three corresponding second coils disposed on three sides of the main frame, or vice versa, and

wherein the second magnets are longer than the second coils in order to cover the second coils, and second hall sensors are disposed adjacent to second coils when viewed in the optical axis direction.

25. The camera module of claim 24, wherein one of the three second coils is longer than at least one of the other two second coils.

26. The camera module of claim 24, wherein one of the three second coils is longer than the sum of lengths of the other two second coils.