Optical card reader

Details Optical card reader Optical card reader

1979-05-21

1981-10-13

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235460, G06K 710

Patent

active

042950511

ABSTRACT:
An improved optical card reader is disclosed which is adapted for use with processing means for providing on-the-fly decoding of multibit data words from a card that is inserted therein. The card reader has two sets of light emitting means and two sets of light detecting means and the light detecting means are interconnected to provide a single set of outputs to comparators which measure the signal levels and provide distinct digital outputs. Selective energization of the light emitting means provides effective multiplexing of two multibit data words from a single set of outputs.

REFERENCES:
patent: 3036765 (1969-05-01), Jones et al.
patent: 3065356 (1969-11-01), Blake et al.
patent: 4066910 (1978-01-01), Swift
patent: 4136820 (1979-01-01), Collado et al.
patent: 4176783 (1979-12-01), Eppich

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