Transmitter-receiver for non-contact IC card system
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United States of America Patent
Stats
-
Dec 30, 1997
Grant Date -
N/A
app pub date -
Jan 11, 1996
filing date -
Jan 11, 1995
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a non-contact IC card system which transmits and receives signals between an interrogator and a transponder, a transmitter-receiver used for the interrogator comprises a distance detecting means for detecting the distance between the interrogator and the transponder, and an output control means for controlling the output level of the interrogator in accordance with the signals detected by the distance detecting means, so as to keep the receiving level of the transponder within the range of a given value. The receiving level in the transponder can be prevented from varying depending on the distance between the interrogator and the transponder, so that it becomes unnecessary to provide a protective circuit against an excessive increase of the receiving level. The optimum threshold voltage can also be prevented from varying.
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