Image-shake correction apparatus and imaging apparatus incorporating the same

Patent metadata

Field	Value
Publication number	US-9332184-B2
Application number	US-201414225713-A
Country	US
Kind code	B2
Filing date	Mar 26, 2014
Priority date	Sep 29, 2011
Publication date	May 3, 2016
Grant date	May 3, 2016

Abstract

The image-shake correction apparatus 1 of the invention comprises a base part 10 including a permanent magnet 20 and a moving part 30 having a coil 40 located in a position opposite to the permanent magnet 20 , wherein the permanent magnet 20 and coil 40 form together a voice coil motor 70 , and the permanent magnet 20 includes cutouts 101, 102 and 103.

First claim

What is claimed is:

1. An image-shake correction apparatus, comprising:
a base part including a permanent magnet, and
a moving part having a coil located in a position opposite to said permanent magnet, wherein:
said moving part is provided with an imaging device for photoelectric conversion of light,
said permanent magnet and said coil form together a voice coil motor,
said permanent magnet includes a cutout, and
said cutout is a space for receiving a portion of said moving part when said moving part is driven by said voice coil motor, and by receiving a portion of said moving part in said space, interference between said moving part and said permanent magnet is prevented.

2. The image-shake correction apparatus according to claim 1 , wherein said permanent magnet comprises a first magnet portion and a second magnet portion, the second magnet portion being oppositely magnetized on a coil side to said first magnet portion, and lengths of said first magnet portion and said second magnet portion differ to form the cutout.

3. An image-shake correction apparatus, comprising:
a base part including a permanent magnet, and
a moving part having a coil located in a position opposite to said permanent magnet, wherein:
said permanent magnet and said coil form together a voice coil motor, and
said permanent magnet comprises a first magnet portion and a second magnet portion, the second magnet portion being oppositely magnetized on a coil side to said first magnet portion, and lengths of said first magnet portion and said second magnet portion differ to form a cutout.

4. The image-shake correction apparatus according to claim 3 , wherein said cutout is located in a position that at least partly overlaps with a range of movement of said moving part by said voice coil motor.

5. The image-shake correction apparatus according to claim 1 or 3 , wherein said coil is formed in a trapezoidal shape whose portion corresponding to said cutout defines an oblique side.

6. The image-shake correction apparatus according to any one of claim 1 or 3 , wherein said coil increases in the number of turns depending on a volume of said cutout.

7. The image-shake correction apparatus according to claim 1 or 3 , further comprising a magnet support portion including an opposite permanent magnet that is located in opposition to, and spaced away from, said permanent magnet with said moving part sandwiched between them, wherein a magnetic pole of said opposite permanent magnet on said moving part side is different from a magnetic pole of said permanent magnet on said moving part side.

8. The image-shake correction apparatus according to claim 2 or 3 , wherein a first direction is defined by a direction of providing said second magnet portion relative to said first magnet portion and a second direction is defined by a direction which is orthogonal to said first direction and in which said first magnet portion and said second magnet portion differ in length, wherein:
in a center line of said coil extending in said second direction that connects a center of said coil with said first direction, a sum of a magnetic flux density in a sectional part having none of said cutout in said first direction and a magnetic flux density in a sectional part having said cutout in said first direction is zero.

9. The image-shake correction apparatus according to claim 8 , wherein a sum of all magnetic flux densities throughout the sectional part having none of said cutout in said first direction and all magnetic flux densities throughout the sectional part having said cutout in said first direction is zero.

10. The image-shake correction apparatus according to claim 8 , wherein the center line of said coil is offset relative to a demarcation line between said first magnet portion and said second magnet portion.

11. The image-shake correction apparatus according to claim 8 , wherein a residual magnetic flux density of said first magnet portion is lower than a residual magnetic flux density of said second magnet portion.

12. The image-shake correction apparatus according to claim 11 , wherein said first magnet portion and said second magnet portion are of different materials.

13. The image-shake correction apparatus according to claim 2 or 3 , further including a magnet support potion comprising a first opposite magnet portion that is located in opposition to, and spaced away from, said first magnet portion with said moving part sandwiched between them and has a magnetic pole on said moving part side, said magnetic pole being different from a magnetic pole of said first magnet portion on said moving part side, and a second opposite magnet portion that is located in opposition to, and spaced away from, said second magnet portion with said moving part sandwiched between them and has a magnetic pole on said moving part side, said magnetic pole being different from a magnetic pole of said second magnet portion on said moving part side.

14. The image-shake correction apparatus according to claim 2 or 3 , wherein said voice coil motor includes a first voice coil motor for moving said moving part in a first direction and a second voice coil motor for moving said moving in a second direction, wherein at least one of said first magnet portion and said second magnet portion is included in both said first voice coil motor and said second voice coil motor.

15. The image-shake correction apparatus according to claim 2 or 3 , wherein said first magnet portion and said second magnet portion are separate ones.

16. An imaging apparatus, comprising said image-shake correction apparatus as recited in claim 1 or 3 , and a body including said image-shake correction apparatus.

Assignees

• Olympus Corp

Inventors

• Okamura Takashi
• Kubota Akihiro

Classifications

• H04N23/54 Primary

  Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils · CPC title

• H04N23/687

  by shifting the lens or sensor position · CPC title

• H04N23/682 Primary

  Vibration or motion blur correction · CPC title

• H04N5/2253

  Electricity · mapped topic

• G03B2205/0038

  by displacing the image plane with respect to the optical axis · CPC title