Clock signal producing device for a card reader

Details Clock signal producing device for a card reader Clock signal producing device for a card reader

1978-10-04

1980-04-01

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

235474, 235475, 250569, G06K 7016, G11B 2726

Patent

active

041963490

ABSTRACT:
A device for reading the data on a card where the data are recorded in the form of marks or punched holes and the like includes means for producing a clock signal, such a clock signal being necessary for reading the data. The device is mechanical and eliminates the need for timing marks. Transit of the card through the device generates an optical signal which is converted into an electrical signal which, in turn, constitutes the clock signal.

REFERENCES:
patent: 3735098 (1973-05-01), Hirata
patent: 3796861 (1974-03-01), Hirata et al.
patent: 3914789 (1975-10-01), Coker, Jr. et al.

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