System for optically transferring information between a moving object and a fixed position
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United States of America Patent
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Feb 11, 1986
Grant Date -
N/A
app pub date -
May 2, 1983
filing date -
May 1, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An information transfer system for transferring information to a fixed position from a moving object. The information system includes a light beam scanning along the route of the moving object. The light beam is linearly deflected. The moving object is provided with a modulation-reflection apparatus which receives the linearly-deflected light and changes a rotary angle at a polarization surface based upon information from the moving object itself such as object number, destination, or running speed. This modulates the incident light and reflects it back in the direction from which it came. The reflected light from the modulation-reflection apparatus is received through a light-sensitive detection device which allows the light to pass corresponding to the rotary angle of the polarization surface. Consequently, information regarding the moving object is discriminated.
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