Feedback control circuit for photosensors in magnetic tape drive

Details Feedback control circuit for photosensors in magnetic tape drive Feedback control circuit for photosensors in magnetic tape drive

1981-05-26

1983-10-18

Christian, Leonard D.

Winding, tensioning, or guiding

Strand tensioning device

Tortuous course

360 746, B65H 5938, G03B 104, G11B 1506

Patent

active

044101481

ABSTRACT:
A magnetic tape recording and reproducing system in which a light reflective marker is on each reel of tape and has a feedback circuit connected between the light sensor and the source of light for controlling the intensity of the source to maintain the output substantially constant, notwithstanding changes of reflectivity of the tape or gradual changes of efficiency of the source of light. The feedback circuit provides improved detection of the passage of the reflective marker past the sensor.

REFERENCES:
patent: 3614020 (1971-10-01), Herger
patent: 4344429 (1982-08-01), Gupton et al.

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