Card and card reader system

Details Card and card reader system Card and card reader system

1980-04-17

1982-05-04

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235487, 235488, 235494, G06K 708

Patent

active

043284159

ABSTRACT:
A card reader for a viewdata terminal such as PRESTEL in which a code in the card is read and used to enable access to the viewdata computer and to charge the appropriate account for use of the viewdata system. The reader detects voltage signals from capacitive couplings between electrodes in the card and in the reader assesses whether they are greater or smaller than a reference level to give binary 1 or binary 0 and compensates for capacitance variations by means of a "dummy" cell which adjusts the reference. Any variations in the signals caused by dirt et cetera affects the dummy cell equally and hence adjusts the reference accordingly. The reader operates in the static mode.

REFERENCES:
patent: 3585368 (1971-06-01), Nunamaker

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