Optical sensing system using positioning holes for encoding

Details Optical sensing system using positioning holes for encoding Optical sensing system using positioning holes for encoding

1997-12-03

2000-01-18

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

25023118, G01D 534

Patent

active

060159715

ABSTRACT:
The present invention discloses an optical sensing system which uses a plurality of positioning holes to identify the positions of corresponding encoding holes so that an encoding signal can be accurately generated according to each detected positioning hole and all the corresponding encoding holes. The optical sensing system comprises an optical panel having a plurality of encoding holes and positioning holes, a sensing device for detecting movements of the optical panel related to the sensing device, and a control circuit connected to the sensing device. The sensing device comprises 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. The control circuit converts an output of the second light detector into an encoding signal when one of the positioning holes is detected by the first light detector. 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 so that for each of the positioning holes detected by the first light detector, all the corresponding encoding holes of the detected positioning hole are clearly detected in the same time by the second light detector.

REFERENCES:
patent: 4988865 (1991-01-01), Schmidt et al.
patent: 5729007 (1998-03-01), Taniguchi et al.

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