Detector arrangement for data-card readers

Details Detector arrangement for data-card readers Detector arrangement for data-card readers

1979-02-01

1981-10-13

Kilgore, Robert M.

Registers

Coded record sensors

Particular sensor structure

235454, G06K 710, G06K 714

Patent

active

042950406

ABSTRACT:
A detector arrangement for a data-card reader is capable of reading both punched cards as well as cards marked in writing. A light source emits light in the direction of the data-card surface, and a detector receives the light reflected from said direction and delivers an output signal in response to the intensity of such light. A surface having a reflective power higher than that of the card material is provided at the back of the data-card in essentially parallel relation to the latter. A high-level output signal is obtained when a hole in the card is detected. A medium level is obtained when there is no marking on the card, and a low level is obtained when a pencil mark is encountered on the card.

REFERENCES:
patent: 2448830 (1948-09-01), Robbins
patent: 2603151 (1952-07-01), Bryce
patent: 3430057 (1969-02-01), Genahr
patent: 3533657 (1970-10-01), Da Silva
patent: 3655945 (1972-04-01), Bowen
patent: 3714447 (1973-01-01), Jallais
patent: 3896294 (1975-07-01), Schisselbauer
patent: 4088265 (1978-05-01), Garczynski
patent: 4125828 (1978-11-01), Resnick

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