Circuit arrangement of a reading device for electromagnetic iden

Details Circuit arrangement of a reading device for electromagnetic iden Circuit arrangement of a reading device for electromagnetic iden

1987-03-06

1988-11-01

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

235380, 331158, 331167, 34082572, G06K 500

Patent

active

047823089

ABSTRACT:
A circuit arrangement of a reading device for electromagnetic identification cards having inverters connected in parallel and an LC resonant circuit forming a transmitting oscillator which is influenced by the identification card to change the amplitude of an oscillating signal in order to recognize approach thereto of the card. Detection of the signal amplitude change is utilized to form pulses for subsequent data processing in which the influence of distance between the identification card and the reading device is minimized.

REFERENCES:
patent: 3842324 (1974-10-01), Atkins
patent: 4546241 (1985-10-01), Walton

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