Registers – Records – Conductive
Patent
1997-01-10
1999-02-23
Le, Thien Minh
Registers
Records
Conductive
235322, G06K 500
Patent
active
058747249
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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Flynn John D.
International Business Machines - Corporation
Le Thien Minh
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