Registers – Coded record sensors
Patent
1996-01-11
1999-02-02
Gross, Anita Pellman
Registers
Coded record sensors
235380, 34082554, 34082572, G06K 500, G08B 13187
Patent
active
058668918
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 includes a carrier wave oscillator capable of sweeping an oscillation frequency, a resonant wave detector for detecting the resonant frequency of the transponder among carrier waves generated by the carrier wave oscillator, and a carrier frequency holder for maintaining the oscillation frequency of the carrier wave oscillator to the frequency detected by the resonant wave detector. The system is driven with a high transmission efficiency by bring the carrier wave frequency of the interrogator into agreement with the resonant frequency of the transponder, without lowering the Q value of the resonant circuit of the transponder and without any special adjustment for controlling the resonant frequency of the transponder to the desired frequency.
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Fujimoto Masahiro
Orihara Katsuhisa
Gross Anita Pellman
Rodriguez Douglas X.
Sony Chemicals Corp.
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