Patent ID: 7598981
Filing Date: 2009-10-06
Classification: G03B,H04N

Abstract:
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 first and second A/D converters; one of said movable unit and said fixed unit having 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; another of said movable unit and said fixed unit having a position-detecting magnet which is used for detecting said first and second locations, and which faces said magnetic-field change-detecting unit; said signal-processing unit outputting a first detected-position signal, which specifies said first location on the basis of output signals of said horizontal magnetic-field change-detecting element, 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 vertical magnetic-field change-detecting element, 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 horizontal current-value being calculated in a first initial-adjustment operation which adjusts a first detecting-resolution when said first detected-position signal is A/D converted by said first A/D converter, by changing the value of the current which flows through the input terminals of said horizontal magnetic-field change-detecting element; current having said optimized horizontal current-value, flowing through the input terminals of said horizontal magnetic-field change-detecting element when detecting the position of said movable unit; an optimized vertical current-value being calculated in a second initial-adjustment operation which adjusts a second detecting-resolution when said second detected-position signal is A/D converted by said second A/D converter, by changing the value of the current which flows through the input terminals of said vertical magnetic-field change-detecting element; and current having said optimized vertical current-value, flowing through the input terminals of said vertical magnetic-field change-detecting element when detecting the position of said movable unit.