Registers – Coded record sensors – Particular sensor structure
Patent
1995-03-09
1996-09-17
Hajec, Donald T.
Registers
Coded record sensors
Particular sensor structure
235450, 235493, 235435, 283 72, 283 82, 283 85, G06K 708
Patent
active
055570909
ABSTRACT:
A bank or identity type of magnetic card contains ferromagnetic elements that selectively absorb waves at microwave frequencies. The disclosure also relates to a reading device adapted to this card. The device has an active system and a resonant system capable of filtering the microwaves at the resonance frequencies of the ferromagnetic materials of the card to be read. The reading device, equipped with a system to measure the amplitude of the microwaves, can thus recognize the magnetic information elements on the card, through the disturbance or non-disturbance of the microwaves during the insertion of the card into the device. The value of the encoding of the card lies in fact that the information elements are hard to destroy.
REFERENCES:
patent: 3509535 (1990-04-01), Berube
patent: 3611197 (1971-10-01), Moore et al.
patent: 4350883 (1982-09-01), Lagarde
patent: 5143636 (1992-09-01), Gaucher et al.
patent: 5241163 (1993-08-01), Vachtsevanos et al.
patent: 5313193 (1994-05-01), Dubois et al.
Hewlett-Packard Journal, vol. 41, No. 5, Oct. 1990, Palo Alto, CA. Nicholson, D. B. "Hexagonal Ferrites For Millimeter-Wave Applications".
Dubois Jean-Claude
Ganne Jean-Pierre
Labeyrie Michele
"Thomson-CSF"
Hajec Donald T.
Lee Michael G.
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