METHOD AND STRUCTURE FOR SUPPRESSING RESONANCE IN AN ANTI-SHAKE LENS FOCUSING MODULE

• US 20130050515A1
• Filed: 08/23/2011
• Published: 02/28/2013
• Est. Priority Date: 08/23/2011
• Status: Active Grant

• Current Assignee: Tdk Taiwan Corp. (TDK Corporation)
• Original Assignee: Fu-Yuan Wu
• Inventors: WU, Fu-Yuan, Huang, Ming-Hang, Hsueh, Ying-Chien, Lee, Kun-I
• Granted Patent: US 8,749,645 B2
• Time in Patent Office: Days
• US Class Current: 348/208.5
• 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 7/08 adapted to co-operate with a remote control mechanism
• CPC Class Codes: G02B 7/38 measured at different points on the optical axis , e.g. focussing on two or more planes and comparing image data

Abstract

A method and a structure for suppressing resonance in an anti-shake lens focusing module are disclosed. The resonance suppressing method includes the steps of providing a lens focusing structure having a first movable part and a first immovable part; providing an anti-shake structure having a second movable part and a second immovable part; providing at least one shock-absorbing material between the first movable and immovable parts as well as between the second movable and immovable parts; and using the shock-absorbing material to absorb any vibration caused by movements of the first and the second movable part, so as to suppress any resonance possibly generated due to the movements of the first and the second movable part.

Claims

1. A method for suppressing resonance in an anti-shake lens focusing module, compressing the following steps:

providing a lens focusing structure having a first movable part and a first immovable part; and

the first movable part holding a lens thereto for the lens to move along an optical axis forward and backward to achieve auto focusing;

providing an anti-shake structure having a second movable part and a second movable part; and

the second movable part being movable to achieve image correction;

providing at least one shock-absorbing material between the first movable part and the first immovable part as well as between the second movable part and the second immovable part; and

using the shock-absorbing material to absorb any vibration caused by movements of the first movable part and the second movable part in achieving auto-focusing and image correction, respectively, so as to suppress any resonance possibly generated due to the movements of the first and the second movable part.

2. The resonance suppressing method as claimed in claim 1, wherein the shock-absorbing material is selected from the group consisting of soft gel, flexible springs, soft rubber materials, and shock-absorbing tapes.

3. The resonance suppressing method as claimed in claim 1, wherein the lens focusing structure includes:

a lens holder constituting the first movable part with the lens centered therein and a winding externally provided therearound; and

a frame constituting the first immovable part with the lens holder centered therein and a plurality of magnetic elements fixed to an inner side of walls of the frame, such that the magnetic elements face toward an outer side of the winding without contacting with the latter.

4. The resonance suppressing method as claimed in claim 3, wherein the shock-absorbing material is provided between the walls of the frame and the lens holder.

5. The resonance suppressing method as claimed in claim 3, wherein the frame is provided on the walls thereof with receiving slots for receiving the shock-absorbing material therein.

6. The resonance suppressing method as claimed in claim 1, wherein the anti-shake structure includes:

a housing constituting the second immovable part, to which the lens focusing structure is connected;

a carrier substrate having an image sensor provided thereon and being connected to the housing to constitute the second immovable part;

a correction lens holder having a correction lens provided thereon and constituting the second movable part;

at least one flexible element being connected to between the second movable part and the second immovable part, so that the correction lens is suspended in the housing to locate on the optical axis;

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; and

the winding assembly being arranged corresponding to the magnet assembly without contacting with the latter;

wherein one of the magnet assembly and the winding assembly is connected to the second movable part while the other one of them is connected to the second immovable part, and the shock-absorbing material is provided between the magnet assembly and the winding assembly.

7. The resonance suppressing method as claimed in claim 6, wherein the correction lens is suspended in the housing by the at least one flexible element to locate between the lens focusing structure and the image sensor.

8. The resonance suppressing method as claimed in claim 6, wherein the at least one flexible element includes a plurality of suspension lines.

9. The resonance suppressing method as claimed in claim 6, wherein the at least one flexible element includes a plate spring.

10. The resonance suppressing method as claimed in claim 1, wherein the anti-shake structure includes:

a housing constituting the second immovable part;

a carrier substrate having an image sensor provided thereon and being connected to the housing to constitute the second immovable part;

at least one flexible element being connected to between the lens focusing structure and the second immovable part, so that the lens focusing structure constitutes the second movable part and is suspended in the housing to locate on the optical axis;

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; and

the winding assembly being arranged corresponding to the magnet assembly without contacting with the latter;

wherein one of the magnet assembly and the winding assembly is connected to the second movable part while the other one of them is connected to the second immovable part, and the shock-absorbing material is provided between the magnet assembly and the winding assembly.

11. The resonance suppressing method as claimed in claim 10, wherein the at least one flexible element includes a plurality of suspension lines.

12. The resonance suppressing method as claimed in claim 10, wherein the at least one flexible element includes a plate spring.

13. The resonance suppressing method as claimed in claim 1, wherein the anti-shake structure includes:

a housing constituting the second immovable part and being connected to the lens focusing structure;

a carrier substrate having an image sensor provided thereon and constituting the second movable part;

at least one flexible element being connected to between the second movable part and the second immovable part, so that the carrier substrate is suspended in the housing to locate on the optical axis behind the lens focusing structure;

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; and

the winding assembly being arranged corresponding to the magnet assembly without contacting with the latter;

wherein one of the magnet assembly and the winding assembly is connected to the second movable part while the other one of them is connected to the second immovable part, and the shock-absorbing material is provided between the magnet assembly and the winding assembly.

14. The resonance suppressing method as claimed in claim 13, wherein the at least one flexible element includes a plurality of suspension lines.

15. The resonance suppressing method as claimed in claim 13, wherein the at least one flexible element includes a plate spring.

16. The resonance suppressing method as claimed in claim 13, wherein the first movable part and the second movable part are connected to each other, such that the shock-absorbing material is provided only between the second movable part and the second immovable part without the need of being provided between the first movable part and the first immovable part.

17. An anti-shake lens focusing module with resonance suppressing structure, comprising:

a lens focusing structure having a first movable part and a first immovable part; and

the first movable part holding a lens thereto for the lens to move along an optical axis forward and backward to achieve auto focusing;

an anti-shake structure having a second movable part and a second movable part; and

the second movable part being movable to achieve image correction; and

at least one shock-absorbing material being provided between the first movable part and the first immovable part as well as between the second movable part and the second immovable part to absorb any vibration caused by movements of the first movable part and the second movable part in achieving auto-focusing and image correction, respectively, so as to suppress any resonance possibly generated due to the movements of the first and the second movable part.

18. The anti-shake lens focusing module as claimed in claim 17, wherein the shock-absorbing material is selected from the group consisting of soft gel, flexible springs, soft rubber materials, and shock-absorbing tapes.

19. The anti-shake lens focusing module as claimed in claim 17, wherein the lens focusing structure includes:

a lens holder constituting the first movable part with the lens centered therein and a winding externally provided therearound; and

a frame constituting the first immovable part with the lens holder centered therein and a plurality of magnetic elements fixed to an inner side of walls of the frame, such that the magnetic elements face toward an outer side of the winding without contacting with the latter.

20. The anti-shake lens focusing module as claimed in claim 19, wherein shock-absorbing material is provided between the walls of the frame and the lens holder.

21. The anti-shake lens focusing module as claimed in claim 19, wherein the frame is provided on the walls with receiving slots for receiving the shock-absorbing material therein.

22. The anti-shake lens focusing module as claimed in claim 17, wherein the anti-shake structure includes:

a housing constituting the second immovable part, to which the lens focusing structure is connected;

a carrier substrate having an image sensor provided thereon and being connected to the housing to constitute the second immovable part;

a correction lens holder having a correction lens provided thereon and constituting the second movable part;

at least one flexible element being connected to between the second movable part and the second immovable part, so that the correction lens is suspended in the housing to locate on the optical axis;

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; and

the winding assembly being arranged corresponding to the magnet assembly without contacting with the latter;

wherein one of the magnet assembly and the winding assembly is connected to the second movable part while the other one of them is connected to the second immovable part, and the shock-absorbing material is provided between the magnet assembly and the winding assembly.

23. The anti-shake lens focusing module as claimed in claim 22, wherein the correction lens is suspended in the housing by the at least one flexible element to locate between the lens focusing structure and the image sensor.

24. The anti-shake lens focusing module as claimed in claim 22, wherein the at least one flexible element includes a plurality of suspension lines.

25. The anti-shake lens focusing module as claimed in claim 22, wherein the at least one flexible element includes a plate spring.

26. The anti-shake lens focusing module as claimed in claim 17, wherein the anti-shake structure includes:

a housing constituting the second immovable part;

a carrier substrate having an image sensor provided thereon and being connected to the housing to constitute the second immovable part;

at least one flexible element being connected to between the lens focusing structure and the second immovable part, so that the lens focusing structure constitutes the second movable part and is suspended in the housing to locate on the optical axis;

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; and

the winding assembly being arranged corresponding to the magnet assembly without contacting with the latter;

wherein one of the magnet assembly and the winding assembly is connected to the second movable part while the other one of them is connected to the second immovable part, and the shock-absorbing material is provided between the magnet assembly and the winding assembly.

27. The anti-shake lens focusing module as claimed in claim 26, wherein the at least one flexible element includes a plurality of suspension lines.

28. The anti-shake lens focusing module as claimed in claim 26, wherein the at least one flexible element includes a plate spring.

29. The anti-shake lens focusing module as claimed in claim 17, wherein the anti-shake structure includes:

a housing constituting the second immovable part and being connected to the lens focusing structure;

a carrier substrate having an image sensor provided thereon and constituting the second movable part;

at least one flexible element being connected to between the second movable part and the second immovable part, so that the carrier substrate is suspended in the housing to locate on the optical axis behind the lens focusing structure;

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; and

the winding assembly being arranged corresponding to the magnet assembly without contacting with the latter;

wherein one of the magnet assembly and the winding assembly is connected to the second movable part while the other one of them is connected to the second immovable part, and the shock-absorbing material is provided between the magnet assembly and the winding assembly.

30. The anti-shake lens focusing module as claimed in claim 29, wherein the at least one flexible element includes a plurality of suspension lines.

31. The anti-shake lens focusing module as claimed in claim 29, wherein the at least one flexible element includes a plate spring.

32. The anti-shake lens focusing module as claimed in claim 29, wherein the first movable part and the second movable part are connected to each other, such that the shock-absorbing material is provided only between the second movable part and the second immovable part without the need of being provided between the first movable part and the first immovable part.