Signalling system
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United States of America Patent
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Sep 23, 2003
Grant Date -
N/A
app pub date -
Aug 11, 1999
filing date -
Feb 11, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A signalling system includes first and second signalling devices. The first signalling device including a retro-reflector modulator, having a lens, a modulator and a reflector, and being operable to receive, modulate and reflect the modulated signal back to the second signalling device. The second signalling device including a signal generator, a receiver for receiving the modulated signal from the first signalling device and a processor for retrieving modulation data from the received modulated signal. The lens of the first signalling device includes a telecentric lens.
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