Position detecting system utilizing a weight coefficient to determine a gravity center of light
AssigneeCanon Kabushiki Kaisha
InventorsMasanobu Hasegawa, Minoru Yoshii, Naoto Abe
Life of this patent
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Abstract
A position detecting system for detecting the relative position of two objects is disclosed wherein: light is projected to the two objects so that the light from the two objects is received by a position detector; to an output signal from the detector is applied a weight coefficient corresponding to the position to determine a gravity center of the light incident; a region of the position detector is set on the basis of the determination; the gravity center of the light incident is determined again on the basis of the set region; and the relative position of the two objects is determined on the basis of the second determination.
Claims6
A method of detecting the relative position of two objects, comprising the steps of:
- projecting light to the two objects so that the light from the two objects is received by a position detector,
- applying to an output signal from the detector a weight coefficient corresponding to the position to determine a gravity center of the light incident;
- setting a region of the position detector on the basis of said determination;
- determining again the gravity center of the light incident, on the basis of the set region;
- and
- determining the relative position of the two objects on the basis of said second determination.
Dependencies are inferred from the claim text.