Track sensor controller

Details Track sensor controller Track sensor controller

1980-06-02

1982-09-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250205, G01V 904

Patent

active

043520138

ABSTRACT:
An integrated circuit is shown for use as a controller for a track sensor used with document processors. The track sensor includes a light source and a light detector. The circuit monitors the signal from the light sensing portion of the sensor, comparing the signal with a standard value and providing a feedback signal to the light source to adjust the intensity of the light to compensate for the effects of aging, holes in a document, the accumulation of dirt on sensor lenses and the like. The circuit determines when the leading edge of a document arrives and when the trailing edges pass by. It includes elements which prevent false indications that the trailing edge has passed when holes go by the sensor.

REFERENCES:
patent: 4072854 (1978-02-01), Oshima et al.
patent: 4097731 (1978-06-01), Krause et al.
patent: 4151410 (1979-04-01), McMillan et al.
patent: 4237378 (1980-12-01), Jones

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