Optical end-of-tape detection device

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

G - Physics

01

N

340/123.2, 352/2

G01N 21/84 (2006.01) G11B 15/08 (2006.01)

Patent

CA 1224255

ABSTRACT: Optical end-of-tape detection device. An optical end-of-tape detection device comprises a photodiode and a phototransistor. In order to enable the light emitted by the photodiode to be distinguished 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.

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