Anti-shake auto-focus modular structure

• US 7,881,598 B1
• Filed: 12/03/2009
• Issued: 02/01/2011
• Est. Priority Date: 12/03/2009
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Inventors: Wu, Fu-Yuan, Hu, Chao-Chang
• Primary Examiner(s): Perkey; W. B.
• Assistant Examiner(s): Phan; Minh Q
• Application Number:
  US12/630,688
• Time in Patent Office: 425 Days
• Field of Search: 396/55, 396/133, 348/208.99, 348/208.12
• US Class Current: 396/55
• CPC Class Codes: G03B 17/00 Details of cameras or camera bodies; Accessories therefor lens hoods or caps G03B11/04
• CPC Class Codes: G03B 3/10 Power-operated focusing

Abstract

An anti-shake auto-focus modular structure includes an image sensor, an auto-focus module for driving a lens to focus captured image on the image sensor; a plurality of suspension wires for suspending the auto-focus module at a position perpendicular to a light entering direction (z-axis), so that the auto-focus module is movable in an x-axis or a y-axis direction; a deviation compensation magnet assembly including at least one x-axis magnet and at least one y-axis magnet; a deviation compensation assembly including at least one x-axis driving winding and at least one y-axis driving winding corresponding to the x-axis magnet and the y-axis magnet, respectively, for producing an electromagnetic field each to drive the x-axis or the y-axis magnet and accordingly the auto-focus module to move in the x-axis or the y-axis direction for compensating a positional deviation of the auto-focus module in the x-axis or the y-axis direction.

Claims

1. An anti-shake auto-focus modular structure for installing on a hand-held device provided with a shake sensor capable of generating a movement signal in response to movement of the hand-held device, comprising:

an image circuit board having an image sensor provided thereon;

an auto-focus module holding a lens thereto for capturing light and image, and driving the lens to move forward and rearward in a light entering direction, so that the lens focuses the captured image on the image sensor;

a plurality of suspension wires being connected to the auto-focus module, so that the auto-focus module is correspondingly suspended in the light entering direction relative to the image circuit board and is allowed to move in an x-axis and a y-axis direction perpendicular to the light entering direction;

a deviation compensation winding assembly including at least one x-axis driving winding and at least one y-axis driving winding, which are capable of producing an electromagnetic field each according to the movement signal generated by the shake sensor;

a deviation compensation magnet assembly including at least one x-axis magnet and at least one y-axis magnet, which are suspended at positions corresponding to the x-axis driving winding and the y-axis driving winding, respectively, such that the deviation compensation magnet assembly is able to move in the x-axis direction or in the y-axis direction in response to the electromagnetic field produced by the deviation compensation winding assembly to thereby bring the auto-focus module to move in the x-axis direction or the y-axis direction; and

an x-axis displacement sensor and a y-axis displacement sensor being arranged to one side of the x-axis driving winding and the y-axis driving winding, respectively, to thereby correspond to the x-axis magnet and the y-axis magnet, respectively, for detecting whether an x-axis deviation volume or a y-axis deviation volume produced by the x-axis magnet or the y-axis magnet during movement thereof has reached a deviation compensation position; and

the x-axis displacement sensor or the y-axis displacement sensor causing the x-axis driving winding or the y-axis driving winding to stop producing the electromagnetic field when the x-axis magnet or the y-axis magnet has reached the deviation compensation position, so as to precisely compensate a positional deviation.

2. The anti-shake auto-focus modular structure as claimed in claim 1, wherein the auto-focus module is a voice coil motor (VCM) driving structure.

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

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

5. The anti-shake auto-focus modular structure as claimed in claim 1, wherein the shake sensor of the hand-held device is selected from the group consisting of a gyro sensor and an accelerometer.

6. The anti-shake auto-focus modular structure as claimed in claim 1, wherein the x-axis displacement sensor and the y-axis displacement sensor are selected from the group consisting of a Hall sensor, a magneto-resistive sensor, a fluxgate sensor, an optical position sensor, and an optical encoder.

7. The anti-shake auto-focus modular structure as claimed in claim 1, wherein the shake sensor is electrically connected to the image circuit board for generating a movement signal when a shake is sensed.

8. The anti-shake auto-focus modular structure as claimed in claim 1, further comprising a fixing member, via which the deviation compensation magnet assembly is fixedly connected to a bottom of the auto-focus module for the auto-focus module to move along with the deviation compensation magnet assembly.

9. The anti-shake auto-focus modular structure as claimed in claim 1, further comprising a fixing member, via which the deviation compensation winding assembly is fixedly connected to a bottom of the auto-focus module for the auto-focus module to move along with the deviation compensation magnet assembly.

10. The anti-shake auto-focus modular structure as claimed in claim 1, further comprising:

an anti-shake driving circuit board, to which the x-axis displacement sensor, the y-axis displacement sensor, the x-axis driving winding, and the y-axis driving winding are electrically connected; and

a supporting frame being arranged in front of the image circuit board for fixedly connecting the anti-shake driving circuit board to the image circuit board.

11. The anti-shake auto-focus modular structure as claimed in claim 1, wherein the image circuit board further has a sensor holder provided thereon to cover onto the image sensor, and the sensor holder has a filter set at a center thereof.

12. An anti-shake auto-focus modular structure, comprising:

an image sensor;

an auto-focus module holding a lens thereto for capturing light and image, and driving the lens to move forward and rearward in a light entering direction, so that the lens focuses the captured image on the image sensor;

a plurality of suspension wires for suspending the auto-focus module at a position perpendicularly to the light entering direction, so that the auto-focus module is able to move in an x-axis and a y-axis direction;

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

a deviation compensation winding assembly including at least one x-axis driving winding and at least one y-axis driving winding located corresponding to the x-axis driving winding and the y-axis driving winding, respectively, and each being capable of producing an electromagnetic field to drive the x-axis magnet to move in the x-axis direction or drive the y-axis magnet to move in the y-axis direction, and accordingly bring the auto-focus module to move in the x-axis direction or the y-axis direction at the same time.

13. The anti-shake auto-focus modular structure as claimed in claim 12, wherein the auto-focus module is a voice coil motor (VCM) driving structure.

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

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

16. The anti-shake auto-focus modular structure as claimed in claim 12, wherein the deviation compensation winding assembly is able to receive a movement signal generated by a shake sensor to produce the electromagnetic field for driving the deviation compensation magnet assembly to move in the x-axis direction or the y-axis direction.

17. The anti-shake auto-focus modular structure as claimed in claim 16, wherein the shake sensor of the hand-held device is selected from the group consisting of a gyro sensor and an accelerometer.

18. The anti-shake auto-focus modular structure as claimed in claim 12, further comprising an x-axis displacement sensor and a y-axis displacement sensor being arranged to one side of the x-axis driving winding and the y-axis driving winding, respectively, to thereby correspond to the x-axis magnet and the y-axis magnet, respectively, for detecting whether an x-axis deviation volume or a y-axis deviation volume produced by the x-axis magnet or the y-axis magnet during movement thereof has reached a deviation compensation position;

and the x-axis displacement sensor or the y-axis displacement sensor causing the x-axis driving winding or the y-axis driving winding to stop producing the electromagnetic field when the x-axis magnet or the y-axis magnet has reached the deviation compensation position, so as to precisely compensate a positional deviation.

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

20. The anti-shake auto-focus modular structure as claimed in claim 12, further comprising a fixing member, via which the deviation compensation magnet assembly is fixedly connected to a bottom of the auto-focus module for the auto-focus module to move along with the deviation compensation magnet assembly.

21. The anti-shake auto-focus modular structure as claimed in claim 12, further comprising a fixing member, via which the deviation compensation winding assembly is fixedly connected to a bottom of the auto-focus module for the auto-focus module to move along with the deviation compensation magnet assembly.