Anti-shake apparatus

• US 20050206735A1
• Filed: 03/14/2005
• Published: 09/22/2005
• Est. Priority Date: 03/17/2004
• Status: Active Grant

• Current Assignee: PENTAX RICOH IMAGING COMPANY, LTD.
• Original Assignee: Pentax Corporation (Hoya Corporation)
• Inventors: Seo, Shuzo
• Granted Patent: US 7,477,291 B2
• Time in Patent Office: Days
• US Class Current: 348/208.400
• CPC Class Codes: H04N 23/55 Optical parts specially adapted for electronic image sensors; Mounting thereof
• 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 and a position-detecting coil, and is movable on a plane which is perpendicular to an optical axis of a camera lens of the photographing-apparatus. The fixed-unit supports the movable-unit so as to be movable on said plane, and has a hall element for detecting a position of the movable-unit on the plane. The position-detecting coil is a magnetic-field generating apparatus which is used for detecting the position, and has first and second position-detecting segments. The first and second position-detecting segments are parts of the position-detecting coil, and face the hall element, and are perpendicular to a movement direction of the movable-unit and to the optical axis. The direction of the current through the first position-detecting segment is opposite to a direction of the current through the second position-detecting segment.

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 that has a position-detecting coil, and that can be moved in first and second directions, said first direction being perpendicular to an optical axis of a camera lens of said photographing apparatus, and said second direction being perpendicular to said optical axis and said first direction; and

a fixed unit that slidably supports said movable unit in both said first and second directions, and that has a magnetic-field change-detecting unit;

said magnetic-field change-detecting unit having a horizontal magnetic-field change-detecting element which is used for detecting a position of said movable unit in said first direction, as a first location, and a vertical magnetic-field change-detecting element which is used for detecting a position of said movable unit in said second direction, as a second location;

said position-detecting coil being a magnetic-field generating apparatus which is used for detecting said first and second locations, and having first and second position-detecting areas;

said first position-detecting area having first and second horizontal position-detecting segments;

said second position-detecting area having first and second vertical position-detecting segments;

said first and second horizontal position-detecting segments being parts of said position-detecting coil, and facing said horizontal magnetic-field change-detecting element, and being parallel to said second direction;

a direction of the current through said first horizontal position-detecting segment being opposite to a direction of the current through said second horizontal position-detecting segment;

said first and second vertical position-detecting segments being parts of said position-detecting coil, and facing said vertical magnetic-field change-detecting element, and being parallel to said first direction; and

a direction of the current through said first vertical position-detecting segment being opposite to a direction of the current through said second vertical position-detecting segment.

2. The anti-shake apparatus according to claim 1, wherein said position-detecting coil is one position-detecting coil;

said first and second position-detecting areas are parts of said one position-detecting coil; and

an outer circumference of said position-detecting coil forms an L character shape, viewed from a third direction which is parallel to said optical axis.

3. The anti-shake apparatus according to claim 1, wherein said position-detecting coil has a horizontal position-detecting coil section which has said first position-detecting area, and a vertical position-detecting coil section which has said second position-detecting area.

4. The anti-shake apparatus according to claim 3, wherein said position-detecting coil forms one stroke drawing shape, where one of the terminals of said horizontal position-detecting coil section is connected with one of the terminals of said vertical position-detecting coil section.

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

6. The anti-shake apparatus according to claim 5, wherein said position-detecting coil consists of a plurality of seat coils which are layered in a third direction which is parallel to said optical axis.

7. The anti-shake apparatus according to claim 1, wherein 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 horizontal magnetic-field change-detecting element is located at a place on said magnetic-field change-detecting unit which faces an intermediate area between said first and second horizontal position-detecting segments in said first direction, and said vertical magnetic-field change-detecting element is located at a place on said magnetic-field change-detecting unit which faces an intermediate area between said first and second vertical position-detecting segments in said second direction.

8. 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 hall elements.

9. 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 that has a position-detecting coil, and that can be moved on a plane which is perpendicular to an optical axis of a camera lens of said photographing apparatus; and

a fixed unit that supports said movable unit so as to be movable on said plane, and that has a magnetic-field change-detecting unit for detecting a position of said movable unit on said plane;

said position-detecting coil being a magnetic-field generating apparatus which is used for detecting said position, and having first and second position-detecting segments;

said first and second position-detecting segments being parts of said position-detecting coil, and facing said magnetic-field change-detecting unit, and being perpendicular to a movement direction of said movable unit and to said optical axis; and

a direction of the current through said first position-detecting segment being opposite to a direction of the current through said second position-detecting segment.