Non-contact IC card reader/writer device, non-contact IC card, input device, and method of calculating location of non-contact IC card
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United States of America Patent
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Jun 19, 2007
Grant Date -
Oct 7, 2004
app pub date -
Jul 24, 2003
filing date -
Oct 11, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A non-contact IC card reader/writer device includes antennas that perform carrier wave transmission and reception with a non-contact IC card, an A/D converter that detects the voltage level of each carrier wave received from the non-contact IC card through the antennas, and a control unit that calculates the location of the non-contact IC card from the voltage levels detected by the A/D converter.
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