Beginning-of-tape sensor with automatic threshold adjustment

Details Beginning-of-tape sensor with automatic threshold adjustment Beginning-of-tape sensor with automatic threshold adjustment

1992-12-22

1993-12-14

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

With circuit for evaluating a web, strand, strip, or sheet

250214R, G01N 2186

Patent

active

052705536

ABSTRACT:
An optical beginning-of-tape detection device with automatic threshold adjustment. In a first embodiment, at two different locations on a tape, a comparator threshold is varied until the comparator switches states. The two locations are sufficiently far apart to guarantee that at least one measurement is not at the beginning-of-tape indication area. The greater of the two thresholds is used, with a predetermined offset for noise margin. In a second embodiment, the threshold is continuously adjusted through a diode across the comparator inputs. The threshold is initialized by moving the tape sufficiently far to guarantee that at some time during initialization the sensor is not at the beginning-of-tape indication area.

REFERENCES:
patent: 3931513 (1976-01-01), Germain
patent: 4372672 (1983-02-01), Pries
patent: 4410148 (1983-10-01), Dunlap
patent: 4570075 (1986-02-01), Spiero
patent: 5073700 (1991-12-01), D'Onofrio

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