Anti-shake apparatus having magnetic position detectors positioned on one axis with common input circuitry
First Claim
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 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;
a fixed unit that slidably supports said movable unit in both said first and second directions;
a signal-processing unit; and
a control unit that controls said movable unit, said fixed unit, and said signal-processing unit, and that has an A/D converter;
whereinone of said movable unit and said fixed unit has a magnetic-field change-detecting unit which has a horizontal magnetic-field change-detecting element for detecting a position of said movable unit in said first direction as a first location, and a vertical magnetic-field change-detecting element for detecting a position of said movable unit in said second direction as a second location;
said signal-processing unit outputs a first detected-position signal, which specifies said first location on the basis of output signals of said horizontal magnetic-field change-detecting element, and outputs a second detected-position signal, which specifies said second location on the basis of output signals of said vertical magnetic-field change-detecting element, and has a common input circuit which supplies electrical power to input terminals of said horizontal and vertical magnetic-field change-detecting elements;
said control unit calculates said first location on the basis of an A/D converting operation by said A/D converter, for said first detected-position signal, and calculates said second location on the basis of an A/D converting operation by said A/D converter, for said second detected-position signal, and performs first and second initial-adjustment operations;
in said first initial-adjustment operation, the width between the minimum and maximum values of said first detected-position signal is maximized, in the movement range of said movable unit, and in the A/D converting range of said A/D converter;
in said second initial-adjustment operation, the width between the minimum and maximum values of said second detected-position signal is maximized, in the movement range of said movable unit, and in the A/D converting range of said A/D converter;
an optimized horizontal current-value for the current, which flows through said input terminals of said horizontal magnetic-field change-detecting element when detecting said first location, is calculated in said first initial-adjustment operation, which adjusts a first detecting-resolution when said first detected-position signal is A/D converted by said A/D converter, by changing the value of the current which flows through the input terminals of said horizontal magnetic-field change-detecting element; and
an optimized vertical current-value for the current, which flows through said input terminals of said vertical magnetic-field change-detecting element when detecting said second location, is calculated in said second initial-adjustment operation, which adjusts a second detecting-resolution when said second detected-position signal is A/D converted by said A/D converter, by changing the value of the current which flows through the input terminals of said vertical magnetic-field change-detecting element.
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Accused Products
Abstract
An anti-shake apparatus of a photographing apparatus comprises a movable unit, a fixed unit, and a signal-processing unit. The movable unit has an imaging device and is movable in first and second directions. The fixed unit slidably supports the movable unit in both the first and second directions. The movable unit has a horizontal magnetic-field change-detecting element for detecting a first location, and a vertical magnetic-field change-detecting element for detecting a second location. The signal-processing unit outputs a first detected-position signal, which specifies the first location on the basis of output signals of the horizontal magnetic-field change-detecting element, and outputs a second detected-position signal, which specifies the second location on the basis of output signals of the vertical magnetic-field change-detecting element. Further, the signal-processing unit has a common input circuit which supplies electrical power to the input terminals of the horizontal and vertical magnetic-field change-detecting elements.
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Citations
10 Claims
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1. An anti-shake apparatus of a photographing apparatus, comprising:
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a movable unit that has one of an imaging device and a hand-shake correcting lens, 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; a fixed unit that slidably supports said movable unit in both said first and second directions; a signal-processing unit; and a control unit that controls said movable unit, said fixed unit, and said signal-processing unit, and that has an A/D converter;
whereinone of said movable unit and said fixed unit has a magnetic-field change-detecting unit which has a horizontal magnetic-field change-detecting element for detecting a position of said movable unit in said first direction as a first location, and a vertical magnetic-field change-detecting element for detecting a position of said movable unit in said second direction as a second location; said signal-processing unit outputs a first detected-position signal, which specifies said first location on the basis of output signals of said horizontal magnetic-field change-detecting element, and outputs a second detected-position signal, which specifies said second location on the basis of output signals of said vertical magnetic-field change-detecting element, and has a common input circuit which supplies electrical power to input terminals of said horizontal and vertical magnetic-field change-detecting elements; said control unit calculates said first location on the basis of an A/D converting operation by said A/D converter, for said first detected-position signal, and calculates said second location on the basis of an A/D converting operation by said A/D converter, for said second detected-position signal, and performs first and second initial-adjustment operations; in said first initial-adjustment operation, the width between the minimum and maximum values of said first detected-position signal is maximized, in the movement range of said movable unit, and in the A/D converting range of said A/D converter; in said second initial-adjustment operation, the width between the minimum and maximum values of said second detected-position signal is maximized, in the movement range of said movable unit, and in the A/D converting range of said A/D converter; an optimized horizontal current-value for the current, which flows through said input terminals of said horizontal magnetic-field change-detecting element when detecting said first location, is calculated in said first initial-adjustment operation, which adjusts a first detecting-resolution when said first detected-position signal is A/D converted by said A/D converter, by changing the value of the current which flows through the input terminals of said horizontal magnetic-field change-detecting element; and an optimized vertical current-value for the current, which flows through said input terminals of said vertical magnetic-field change-detecting element when detecting said second location, is calculated in said second initial-adjustment operation, which adjusts a second detecting-resolution when said second detected-position signal is A/D converted by said A/D converter, by changing the value of the current which flows through the input terminals of said vertical magnetic-field change-detecting element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification