Badge reader using infrared light

Details Badge reader using infrared light Badge reader using infrared light

1982-03-10

1984-03-13

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235474, 235458, G06K 710

Patent

active

044369913

ABSTRACT:
A badge reader which uses infrared light employs circuitry for determining whether portions of the identification badge are relatively opaque or transparent to infrared radiation upon insertion of the badge into the badge reader. The circuitry includes a source of infrared radiation, such as an infrared emitting diode, a detector of infrared radiation such as a phototransistor, an alignment device for detecting the alignment of the opaque or transparent portions of the badge with the source and detector and for producing an alignment signal. The alignment signal is delivered to an infrared emitting diode driver for driving the diode to produce a pulse of infrared radiation in response to the alignment signal. The detector detects a sufficient amount of infrared radiation only when that portion of the card is relatively transparent, and produces an output in response thereto.

REFERENCES:
patent: Re28081 (1974-07-01), Travioli
patent: 3582623 (1971-06-01), Rothery
patent: 3976856 (1976-08-01), Ramage
patent: 4055747 (1977-10-01), Jensen
patent: 4063070 (1977-12-01), Delarue
patent: 4114028 (1978-09-01), Baio
patent: 4217487 (1980-08-01), Kjeer

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