ANTI-SHAKE STRUCTURE FOR AUTO-FOCUS MODULAR

• US 20110217029A1
• Filed: 03/04/2010
• Published: 09/08/2011
• Est. Priority Date: 03/04/2010
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Inventors: Chan, Yi-Liang, Wu, Fu-Yuan, Hu, Chao-Chang
• Granted Patent: US 8,254,769 B2
• Time in Patent Office: Days
• US Class Current: 396/55
• 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: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 5/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

An anti-shake structure for auto-focus module includes an auto-focus module for driving a lens to move forward and rearward in a light entering path, i.e. in z-axis direction, so that the lens focuses light on an image sensor; a frame for holding the auto-focus module therein; a lens suspender with a compensation lens arranged thereon being connected to a plurality of suspension wires while the latter are connected at respective another end to the top cover plate of the frame, so that the compensation lens is correspondingly suspended in the frame in the light entering path and located behind the lens; and a shake compensation driving unit for driving the lens suspender to move horizontally in x-axis or y-axis direction, so as to compensate any image shift caused by hand shaking.

Claims

1. An anti-shake structure for auto-focus module for capturing and focusing light on an image sensor covered by a sensor holder, comprising:

an auto-focus module for driving a lens to move forward and rearward in a light entering path, i.e. in z-axis direction, so that the lens focuses the captured light on the image sensor;

a frame having a top cover plate formed with a central opening for holding the auto-focus module therein;

a lens suspender with at least one compensation lens arranged thereon, the lens suspender being connected to a plurality of suspension wires while the suspension wires are connected at respective one end opposite to the lens suspender to the top cover plate of the frame, so that the compensation lens is correspondingly suspended in the frame in the light entering path and located behind the lens; and

a shake compensation driving unit for driving the lens suspender to move horizontally in x-axis direction or y-axis direction, so as to compensate any shift of image caused by hand shaking.

2. The anti-shake structure for auto-focus module as claimed in claim 1, further comprising a shake sensor for sensing a shake and generating a shake signal correspondingly;

and the shake signal being sent to the shake compensation driving unit for use as a basis of driving the lens suspender to move horizontally in x-axis direction or y-axis direction.

3. The anti-shake structure for auto-focus module as claimed in claim 1, wherein the suspension wires are made of a flexible wire material.

4. The anti-shake structure for auto-focus module as claimed in claim 1, wherein the suspension wires are electrically conductive to serve as conducting wires for transferring driving current to the shake compensation driving unit.

5. The anti-shake structure for auto-focus module as claimed in claim 1, wherein the shake compensation driving unit comprising:

a magnet assembly including at least one x-axis magnet and at least one y-axis magnet; and

a winding assembly including at least one x-axis winding and at least one y-axis winding corresponding to the x-axis magnet and the y-axis magnet, respectively, for receiving the shake signal and generating electromagnetic fields correspondingly, so as to drive the lens suspender and the compensation lens to move in x-axis direction or y-axis direction.

6. The anti-shake structure for auto-focus module as claimed in claim 5, wherein the shake compensation driving unit further comprising a displacement sensor assembly;

the displacement sensor assembly including an x-axis sensor and a y-axis sensor corresponding to the x-axis magnet and the y-axis magnet, respectively, for detecting a volume of displacement in x-axis direction or y-axis direction, so that the lens suspender and the compensation lens are precisely moved to a correct compensation position.

7. The anti-shake structure for auto-focus module as claimed in claim 6, wherein the x-axis sensor and the y-axis sensor are displacement sensors selected from the group consisting of a Hall sensor, a magneto-resistive sensor, a fluxgate sensor, an optical position sensor, and an optical encoder.

8. The anti-shake structure for auto-focus module as claimed in claim 5, wherein the magnet assembly is fixedly connected to an underside of the auto-focus module, and the winding assembly is connected to a top of the lens suspender.

9. The anti-shake structure for auto-focus module as claimed in claim 5, wherein the winding assembly is fixedly connected to an underside of the auto-focus module, and the magnet assembly is connected to a top of the lens suspender.

10. The anti-shake structure for auto-focus module as claimed in claim 5, wherein the winding assembly is fixedly connected to a top of the sensor holder, and the magnet assembly is connected to an underside of the lens suspender.

11. The anti-shake structure for auto-focus module as claimed in claim 5, wherein the magnet assembly is fixedly connected to a top of the sensor holder, and the winding assembly is connected to an underside of the lens suspender.

12. An anti-shake structure for auto-focus module for capturing and focusing light on an image sensor covered by a sensor holder, comprising:

a frame having a top cover plate formed with a central opening, and the top cover plate being provided at predetermined positions with a plurality of through holes;

an auto-focus module being fixedly connected to the top cover plate for driving a lens to move forward and rearward in a light entering path, i.e. in z-axis direction, so that the lens focuses the captured light on the image sensor;

a lens suspender with at least one compensation lens arranged thereon, the lens suspender being connected to a plurality of suspension wires while the suspension wires have respective one end opposite to the lens suspender extended through the through holes on the top cover plate to connect to the sensor holder, so that the compensation lens is correspondingly suspended in the light entering path and located in front of the lens; and

a shake compensation driving unit for driving the lens suspender to move horizontally in x-axis direction or y-axis direction, so as to compensate any shift of image caused by hand shaking.

13. The anti-shake structure for auto-focus module as claimed in claim 12, further comprising a shake sensor for sensing a shake and generating a shake signal correspondingly;

and the shake signal being sent to the shake compensation driving unit for use as a basis of driving the lens suspender to move horizontally in x-axis direction or y-axis direction.

14. The anti-shake structure for auto-focus module as claimed in claim 12, wherein the suspension wires are made of a flexible wire material.

15. The anti-shake structure for auto-focus module as claimed in claim 12, wherein the suspension wires are electrically conductive to serve as conducting wires for transferring driving current to the shake compensation driving unit.

16. The anti-shake structure for auto-focus module as claimed in claim 12, wherein the shake compensation driving unit comprising:

a magnet assembly including at least one x-axis magnet and at least one y-axis magnet; and

a winding assembly including at least one x-axis winding and at least one y-axis winding corresponding to the x-axis magnet and the y-axis magnet, respectively, for receiving the shake signal and generating electromagnetic fields correspondingly, so as to drive the lens suspender and the compensation lens to move in x-axis direction or y-axis direction.

17. The anti-shake structure for auto-focus module as claimed in claim 16, wherein the shake compensation driving unit further comprising a displacement sensor assembly;

the displacement sensor assembly including an x-axis sensor and a y-axis sensor corresponding to the x-axis magnet and the y-axis magnet, respectively, for detecting a volume of displacement in x-axis direction or y-axis direction, so that the lens suspender and the compensation lens are precisely moved to a correct compensation position.

18. The anti-shake structure for auto-focus module as claimed in claim 17, wherein the x-axis sensor and the y-axis sensor are displacement sensors selected from the group consisting of a Hall sensor, a magneto-resistive sensor, a fluxgate sensor, an optical position sensor, and an optical encoder.

19. The anti-shake structure for auto-focus module as claimed in claim 16, wherein the magnet assembly is fixedly connected to a top of the top cover plate of the frame, and the winding assembly is connected to an under side of the lens suspender.

20. The anti-shake structure for auto-focus module as claimed in claim 16, wherein the winding assembly is fixedly connected to a top of the top cover plate of the frame, and the magnet assembly is connected to an under side of the lens suspender.