Method and means of reading punched data tape

Details Method and means of reading punched data tape Method and means of reading punched data tape

G - Physics

06

K

352/53.73

G06K 7/10 (2006.01)

Patent

CA 1144644

-1- ABSTRACT A photoelectric circuit for reading punched data tape wherein the circuit compensates for variations in phototransistors and light emitting diodes, dust accumulation and degradation of the light emitting diodes by comparing the light transmitted through a punched section of the tape to the light transmitted through a solid section of the tape. Herbst 3

351738

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