Anti-shake apparatus
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, and that has a magnetic-field change-detecting unit;
a signal-processing unit; and
a control unit that controls said movable unit, said fixed unit, and said signal-processing unit, and that has first and second A/D converters;
said magnetic-field change-detecting unit having first and second horizontal magnetic-field change-detecting elements for detecting a position of said movable unit in said first direction as a first location, and first and second vertical magnetic-field change-detecting elements for detecting a position of said movable unit in said second direction as a second location;
said movable unit having a position-detecting magnetic-field generating unit which is used for detecting said first and second locations, and which faces said magnetic-field change-detecting unit, and which has a position-detecting coil;
said position-detecting coil being magnetized by being electrified where an N pole and an S pole are arranged in a third direction which is parallel to said optical axis, and said position-detecting coil being wound, such that its outer circumference shape, viewed from said third direction, is a rectangular shape and faces said magnetic-field change-detecting unit, an external structure of said rectangular shape forming lines which are parallel to one of said first direction and said second direction;
said signal-processing unit outputting a first detected-position signal, which specifies said first location on the basis of output signals of said first and second horizontal magnetic-field change-detecting elements, to said first A/D converter, and outputting a second detected-position signal, which specifies said second location on the basis of output signals of said first and second vertical magnetic-field change-detecting elements, to said second A/D converter;
said control unit calculating said first location on the basis of an A/D converting operation by said first A/D converter, for said first detected-position signal, and calculating said second location on the basis of an A/D converting operation by said second A/D converter, for said second detected-position signal;
an optimized coil current-value being calculated in an initial-adjustment operation which adjusts a detecting-resolution when said first and second detected-position signals are A/D converted by said first and second A/D converters, by changing the value of the current which flows through said position-detecting coil; and
current having said optimized coil current-value, flowing through said position-detecting coil when detecting the position of said movable unit.
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Accused Products
Abstract
An anti-shake-apparatus comprises a movable-unit, a fixed-unit, a signal-processor, and a controller. The movable-unit has an imaging-device and is movable in first- and second-directions. The fixed-unit has a hall-element-unit. The controller controls the movable-unit, the fixed-unit, and the signal-processor, and has first- and second-A/D-converters. The hall-element-unit has first and second horizontal-hall-elements for detecting a first-location, and first and second vertical-hall-elements for detecting a second-location. The movable-unit has a magnetic-field-generating unit having a coil for detecting the first- and second-locations. The signal-processor outputs a first-signal, specifying the first-location from the horizontal-hall-elements, to the first-A/D-converter, and a second-signal, specifying the second-location from the vertical-hall-elements, to the second-A/D-converter. The controller calculates the first-location from an A/D-converting operation of the first-signal, and the second-location from an A/D-converting operation of the second-signal. An current-value is calculated in an initial-adjustment-operation adjusting a detecting-resolution in A/D-converting the first- and second-signals, and flows through the coil.
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Citations
13 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, and that has a magnetic-field change-detecting unit;
a signal-processing unit; and
a control unit that controls said movable unit, said fixed unit, and said signal-processing unit, and that has first and second A/D converters;
said magnetic-field change-detecting unit having first and second horizontal magnetic-field change-detecting elements for detecting a position of said movable unit in said first direction as a first location, and first and second vertical magnetic-field change-detecting elements for detecting a position of said movable unit in said second direction as a second location;
said movable unit having a position-detecting magnetic-field generating unit which is used for detecting said first and second locations, and which faces said magnetic-field change-detecting unit, and which has a position-detecting coil;
said position-detecting coil being magnetized by being electrified where an N pole and an S pole are arranged in a third direction which is parallel to said optical axis, and said position-detecting coil being wound, such that its outer circumference shape, viewed from said third direction, is a rectangular shape and faces said magnetic-field change-detecting unit, an external structure of said rectangular shape forming lines which are parallel to one of said first direction and said second direction;
said signal-processing unit outputting a first detected-position signal, which specifies said first location on the basis of output signals of said first and second horizontal magnetic-field change-detecting elements, to said first A/D converter, and outputting a second detected-position signal, which specifies said second location on the basis of output signals of said first and second vertical magnetic-field change-detecting elements, to said second A/D converter;
said control unit calculating said first location on the basis of an A/D converting operation by said first A/D converter, for said first detected-position signal, and calculating said second location on the basis of an A/D converting operation by said second A/D converter, for said second detected-position signal;
an optimized coil current-value being calculated in an initial-adjustment operation which adjusts a detecting-resolution when said first and second detected-position signals are A/D converted by said first and second A/D converters, by changing the value of the current which flows through said position-detecting coil; and
current having said optimized coil current-value, flowing through said position-detecting coil when detecting the position of said movable unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. 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 on a plane which is perpendicular to an optical axis of a camera lens of said photographing apparatus;
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;
a signal-processing unit; and
a control unit that has an A/D converter;
said movable unit having a position-detecting magnetic-field generating unit which is used for detecting said position, and which faces said magnetic-field change-detecting unit, and which has a position-detecting coil;
said position-detecting coil being magnetized by being electrified where an N pole and an S pole are arranged in a direction which is parallel to said optical axis;
said signal-processing unit outputting a detected-position signal, which specifies said position on the basis of an output signal of said magnetic-field change-detecting unit, to said A/D converter;
said control unit calculating said position on the basis of an A/D converting operation by said A/D converter, for said detected-position signal;
an optimized coil current-value being calculated in an initial-adjustment operation which adjusts a detecting-resolution when said detected-position signal is A/D converted by said A/D converter, by changing the value of the current which flows through said position-detecting coil; and
current having said optimized coil current-value, flowing through said position-detecting coil when detecting said position. - View Dependent Claims (13)
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Specification