Recognition system and recognition method for non-contact IC cards
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United States of America Patent
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-
Mar 21, 2000
Grant Date -
N/A
app pub date -
Jul 16, 1998
filing date -
Jan 16, 1998
priority date (Note) -
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Abstract
A recognition system for non-contact IC cards that avoids the collision of response signals with a simple construction. A non-contact IC card in this system has a first transmitter that immediately transmits a response signal at a predetermined time slot for a first polling trial by the reader/writer and a second transmitter that transmits a response signal at a randomly time slot from a predetermined number of succeeding time slots, in response to a subsequent polling trial by the reader/writer. A reader/writer in this system has a polling unit that waits for the return of a response signal from a non-contact IC card at the predetermined time slot during the execution of a first polling trial and waits for the return of a response signal from a non-contact IC card at the randomly selected time slot during the execution of the subsequent polling trials.
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