Optical end-of-tape detection device

Details Optical end-of-tape detection device Optical end-of-tape detection device

1983-06-06

1986-02-11

Cardillo, Jr., Raymond F.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

360137, 360 746, G06K 710, G11B 1508

Patent

active

045700753

ABSTRACT:
An optical end-of-tape detection device comprises a photodiode and a phototransistor. In order to distinguish the light emitted by the photodiode from the ambient light, the photodiode is operated in a pulsating fashion. Moreover, the low-frequency component of the photo current supplied by the photo-transistor is suppressed by negative current feedback.

REFERENCES:
patent: 3739177 (1973-06-01), Ko
patent: 3838291 (1974-09-01), Marion et al.
patent: 3859647 (1975-01-01), Ross
patent: 4186309 (1980-01-01), Gnuechtel
patent: 4320423 (1982-03-01), Frey et al.

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