Anti-shake apparatus

• US 20050168585A1
• Filed: 01/28/2005
• Published: 08/04/2005
• Est. Priority Date: 01/30/2004
• Status: Abandoned Application

• Current Assignee: Pentax Corporation (Hoya Corporation)
• Original Assignee: Pentax Corporation (Hoya Corporation)
• Inventors: Uenaka, Yukio, Seo, Shuzo
• Application Number:
  US11/044,055
• Publication Number:
  US 20050168585A1
• Time in Patent Office: Days
• US Class Current: 348/208.990
• CPC Class Codes: H04N 23/60 Control of cameras or camera modules
• 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 anti-shake apparatus of a photographing-apparatus comprises a movable-unit and a fixed-unit. The movable-unit has an imaging-device, a position-detecting magnetic-field generating unit. The movable-unit can be moved in a first-direction and a second-direction. The fixed-unit has a hall-element unit. The first-direction is perpendicular to an optical axis of a camera-lens of the photographing-apparatus. The second-direction is perpendicular to the optical axis and the first-direction. The position-detecting magnetic-field generating unit is used for detecting a first location in the first-direction of the movable-unit, and a second location in the second-direction of the movable-unit, and has a position-detecting coil. The hall-element unit has a horizontal hall-element which is used for detecting the first location, and has a vertical hall-element which is used for detecting the second location. The position-detecting coil is magnetized by being electrified only when detecting the first location and the second location, and faces the hall-element unit.

Claims

1. An anti-shake apparatus of a photographing apparatus, comprising:

a movable unit that has one of an imaging device and a hand-shake correcting lens, and has a position-detecting magnetic-field generating unit, and is movable in a first direction and a second direction; and

a fixed unit that has a magnetic-field change-detecting unit;

said first direction being perpendicular to an optical axis of a camera lens of said photographing apparatus;

said second direction being perpendicular to said optical axis and said first direction;

said position-detecting magnetic-field generating unit being used for detecting a first location in said first direction of said movable unit, and a second location in said second direction of said movable unit, and having a position-detecting coil;

said magnetic-field change-detecting unit having a horizontal magnetic-field change-detecting element which is used for detecting said first location, and having a vertical magnetic-field change-detecting element which is used for detecting said second location; and

said position-detecting coil being magnetized by being electrified only when detecting said first location and said second location, and said position-detecting coil facing said magnetic-field change detecting unit.

2. The anti-shake apparatus according to claim 1, wherein said position-detecting coil is wound, such that its outer circumference shape, viewed from a third direction which is parallel to said optical axis, is a square and faces said magnetic-field change-detecting unit;

and

an external structure of said square forms lines which are parallel to one of said first direction and said second direction.

3. The anti-shake apparatus according to claim 2, wherein said movable unit is located at the center of its movement range, in both said first and second directions, when the center area of one of said imaging device and said hand-shake correcting lens which is included in said movable unit, is located on said optical axis.

4. The anti-shake apparatus according to claim 3, wherein said magnetic-field change-detecting unit has first and second horizontal magnetic-field change-detecting elements as said horizontal magnetic-field change-detecting element, and first and second vertical magnetic-field change-detecting elements as said vertical magnetic-field change-detecting element;

and

when the center of one of said imaging device and said hand-shake correcting lens which is included in said movable unit passes through said optical axis, said first horizontal magnetic-field change-detecting element is located at a place which faces midway along a side of said square outer circumference, in said second direction, of said position-detecting coil;

said second horizontal magnetic-field change-detecting element is located at a place which faces midway along another side of said square outer circumference, in said second direction, of said position-detecting coil;

said first vertical magnetic-field change-detecting element is located at a place which faces midway along a side of said square outer circumference, in said first direction, of said position-detecting coil; and

said second vertical magnetic-field change-detecting element is located at a place which faces midway along another side of said square outer circumference, in said first direction, of said position-detecting coil.

5. The anti-shake apparatus according to claim 4, wherein said magnetic-field change-detecting unit is a two-axes hall element;

said first and second horizontal magnetic-field change-detecting elements are hall elements; and

said first and second vertical magnetic-field change-detecting elements are hall elements.

6. The anti-shake apparatus according to claim 1, wherein said position-detecting coil is magnetized where a N pole and a S pole are arranged in a third direction which is parallel to said optical axis.

7. The anti-shake apparatus according to claim 1, wherein said position-detecting coil is used for generating a magnetic-field.

8. The anti-shake apparatus according to claim 1, wherein said position-detecting magnetic-field generating unit has a magnetic core;

said position-detecting coil is wound around said magnetic core;

said magnetic core is made of a magnetic material, and has a rectangular prism form; and

said rectangular prism form has a front-surface which faces said magnetic-field change-detecting unit and is a square shape that is the same as said outer circumference of said position-detecting coil.

9. The anti-shake apparatus according to claim 1, wherein said position-detecting coil forms a seat and a spiral shape coil pattern.

10. The anti-shake apparatus according to claim 1, wherein said fixed unit has a position-detecting yoke;

said position-detecting yoke is attached to a back surface side of said fixed unit, which is the opposite side to the surface having said magnetic-field change-detecting unit, and is made of a magnetic material.

11. The anti-shake apparatus according to claim 1, wherein said horizontal magnetic-field change-detecting element and said vertical magnetic-field change-detecting element are one of hall elements, MI sensors, magnetic resonance-type magnetic-field detecting elements, and MR elements.