Optical image stabilizer for camera lens assembly

• US 20060082659A1
• Filed: 02/22/2005
• Published: 04/20/2006
• Est. Priority Date: 10/20/2004
• Status: Abandoned Application

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Koo, Jun-Mo
• Application Number:
  US11/063,097
• Publication Number:
  US 20060082659A1
• Time in Patent Office: Days
• US Class Current: 348/208.990
• 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: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/687 by shifting the lens or sensor position

Abstract

An optical image stabilizer for a camera lens assembly is disclosed and includes: a board having an image sensor on one surface thereof; a double actuator disposed at one side of the board for moving the board in a first direction and a second direction perpendicular to the first direction on a plane; and a guide means for guiding the movements of the board in the first and the second directions, while preventing the board from rotating about an optical axis of the camera lens assembly. The double actuator for moving the board in two directions is disposed at only one side of the board, so that the camera lens assembly including the optical image stabilizer can be downsized. Further, the guide means permits the board to move only linearly in the first direction and the second direction, thereby preventing the image sensor from rotating around an optical axis and thus improving the reliability of the camera lens assembly.

Claims

1. An optical image stabilizer for a camera lens assembly, comprising:

a board having an image sensor on one surface thereof;

a double actuator disposed at one end of the board for moving the board in a first direction and a second direction; and

a guide means for guiding the movements of the board in the first and the second directions, while preventing the board from rotating about an optical axis of the camera lens assembly.

2. The optical image stabilizer as claimed in claim 1, wherein the double actuator includes:

a first support plate and a second support plate facing each other, each extending from one lateral surface of the board to provide a plane perpendicular to the optical axis;

a first coil and a second coil disposed on a surface of the first support plate and a surface of the second support plate, both surfaces facing each other; and

a first magnetic body and a second magnetic body facing the first coil and the second coil, respectively, each magnetic body and each coil being spaced apart from each other,

wherein the first and the second coils generate a driving force for moving the board when electric currents are applied thereto.

3. The optical image stabilizer as claimed in claim 2, wherein the board moves in the first direction when electric currents are applied to the first coil, and the board moves in the second direction when electric currents are applied to the second coil.

4. The optical image stabilizer as claimed in claim 2, further including a pair of yokes to which each of the first and the second magnetic bodies is attached.

5. The optical image stabilizer as claimed in claim 2, further including a yoke interposed between the first support plate and the second support plate.

6. The optical image stabilizer as claimed in claim 1, wherein the guide means includes:

a first slider fixed to the other surface of the board and having an opening extending in the first direction;

a first guide shaft extending in the first direction and slidably coupled to the opening of the first slider;

a pair of second sliders fixed to both ends of the first guide shaft, each having an opening extending in the second direction; and

a pair of second guide shafts extending in the second direction, each slidably coupled to the opening of the second slider.

7. The optical image stabilizer as claimed in claim 1, wherein the optical lens stabilizer is adaptable to a lens assembly having at least one lens.

8. The optical image stabilizer as claimed in claim 1, wherein the first direction is substantially perpendicular to the second direction.

9. The optical image stabilizer as claimed in claim 1, wherein the double actuator drives the board when a movement of the camera lens assembly is detected.

10. An optical image stabilizer for a camera lens assembly, comprising:

a housing;

a board having a first board plate and a second board plate, the first board plate having a first coil and the second board plate having a second coil; and

an actuator for moving the board to a first direction and a second direction,

wherein the movement of the board is generated by an application of electric currents to the first coil and the second coil.

11. The optical image stabilizer as claimed in claim 10, wherein the actuator further comprising a first and a second magnetic body disposed in such a manner that they face the first coil and the second coil, respectively.

12. The optical image stabilizer as claimed in claim 10, wherein the board moves diagonally with respect to the first direction or the second direction if electric currents are applied to both the first and the second coils.

13. The optical image stabilizer as claimed in claim 10, wherein the boarding further comprises an image sensor at one end thereof.

14. The optical image stabilizer as claimed in claim 10, further comprising a guide means for guiding the movements of the board in the first and the second directions, while preventing the board from rotating around an optical axis of the camera lens assembly.

15. The optical image stabilizer as claimed in claim 14, wherein the guide means includes:

a first slider fixed to the other surface of the board and having an opening extending in the first direction;

a first guide shaft extending in the first direction and slidably coupled to the opening of the first slider;

a pair of second sliders fixed to both ends of the first guide shaft, each having an opening extending in the second direction; and

a pair of second guide shafts extending in the second direction, each slidably coupled to the opening of the second slider.

16. The optical image stabilizer as claimed in claim 10, wherein the optical lens stabilizer is adaptable to a lens assembly having at least one lens.

17. The optical image stabilizer as claimed in claim 10, wherein the first direction is substantially perpendicular to the second direction.

18. The optical image stabilizer as claimed in claim 10, wherein the double actuator drives the board when a movement of the camera lens assembly is detected.