Light selectable radio frequency identification tag and method therefor
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United States of America Patent
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Feb 23, 1999
Grant Date -
N/A
app pub date -
Jan 10, 1997
filing date -
Jan 10, 1997
priority date (Note) -
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status (Latency Note)
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Abstract
A radio frequency identification (RFID) tag includes a photodetector which is receptive to a predefined wavelength and a control circuit which is receptive to a flash pattern of a light source. The RFID tag responds to a predefined command from RFID base station only if the photodetector included in the tag was activated by a light signal having an appropriate wavelength and flash pattern. During or after the photodetector circuit is activated, an operator of a pulsed light source then interrogates a single RFID tag with an unknown identification by using a pulsed light source to illuminate the particular tag. Only the tag illuminated by the pulsed light source responds to the reader.
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