Patent ID: 6249743
Filing Date: 2001-06-19
Classification: G01C,G01S,G05D

Abstract:
A method of detecting a position of a movable body comprising the steps of:emitting light to outside of said movable body by means of a light emitting apparatus provided with said movable body;receiving said light, which is reflected by a plurality of reflectors provided with a moving area of said movable body, by means of a light receiving apparatus provided with said movable body for obtaining an electric output corresponding to an intensity of said received light;comparing a received-light luminance distribution along a circumferential direction of said movable body, which is obtained from the received-light output, with reference received-light luminance distributions stored in advance in association with a plurality of positions in said moving area of said movable body; anddetecting the position of said movable body in accordance with a comparison result.