Patent ID: 6015971
Filing Date: 2000-01-18
Classification: G01D

Abstract:
An optical sensing system comprising:an optical panel comprising a plurality of encoding holes and positioning holes;a sensing device for detecting movements of the optical panel related to the sensing device, the sensing device comprising a light source for emitting light to the optical panel, a first light detector for detecting the light transmitted through the positioning holes and a second light detector for detecting the light transmitted through the encoding holes and generating an output to indicate the detected encoding holes accordingly; anda control circuit connected to the sensing device for converting the output of the second light detector into an encoding signal when one of the positioning holes is detected by the first light detector;wherein the relative positions of the positioning holes and the encoding holes over the optical panel are arranged according to the positions of the first and second light detectors and the size of each of the positioning holes is smaller than the size of each of the encoding holes, so that for each of the positioning holes detected by the first light detector, a predetermined number of corresponding encoding holes of the detected positioning hole are clearly detected in the same time by the second light detector.