Reading and writing apparatus for portable recording medium

Details Reading and writing apparatus for portable recording medium Reading and writing apparatus for portable recording medium

1987-02-12

1988-08-30

Trafton, David L.

Registers

Coded record sensors

Particular sensor structure

235436, 235492, G06K 706

Patent

active

047679182

ABSTRACT:
In an IC card information reading and writing apparatus, a clock oscillator (4.9 MHz) is incorporated in the apparatus. Since the high-frequency clock is not passed through a cable connected between the apparatus and an external control unit, but supplied from the clock oscillator to the IC card via a short distance, the external control unit can stably control the IC card through the long cable without generating crosstalk or reflection. The clock signal is selectively supplied to the IC card via an AND gate in response to a clock-enable signal from the external control unit or a binary logic signal supply voltage for the reading and writing apparatus.

REFERENCES:
patent: 4004133 (1977-01-01), Hannan et al.
patent: 4373158 (1983-02-01), Orloff
patent: 4621190 (1986-11-01), Saito et al.
patent: 4720626 (1988-01-01), Nishikawa et al.

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