Registers – Coded record sensors – Particular sensor structure
Patent
1989-12-18
1992-01-21
Trafton, David
Registers
Coded record sensors
Particular sensor structure
235493, 331 64, G06K 708
Patent
active
050830139
ABSTRACT:
The station, in particular a terminal, comprises an oscillator (OS) having a feedback loop (1) and a station inductor element (L10) suitable for conferring a working frequency to the oscillator which varies relative to a rest frequency. The station also includes a station processor connected to the oscillator and capable of processing variations in the working frequency of the oscillator. The portable object, in particular a memory card, includes an electronic circuit which is switchable between an inactive state and an active state in which it sets up a resonant circuit tuned on a frequency which is distinct from the rest frequency while remaining suitable for being coupled inductively with the feedback loop (1) at the rest frequency. The portable object also includes an object processor capable of switching the electronic circuit as a function of the information to be transmitted to the station. The variation in the operating frequency of the oscillator as induced in this way by the switching enables the station processor to deduce the information.
REFERENCES:
patent: 2393717 (1946-01-01), Speaker
patent: 4029945 (1977-06-01), Yamada et al.
patent: 4650981 (1987-03-01), Foletta
patent: 4782308 (1988-11-01), Trobec et al.
patent: 4918416 (1990-04-01), Walton et al.
patent: 4960983 (1990-10-01), Inoue
L'Etat Francais represente par le Ministre des Postes, des
Trafton David
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