Digital diagnostic system for optical paper path sensors

Details Digital diagnostic system for optical paper path sensors Digital diagnostic system for optical paper path sensors

1996-10-18

1998-02-24

Le, Que

Radiant energy

Photocells; circuits and apparatus

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

25055945, 358504, G01N 2186

Patent

active

057214344

ABSTRACT:
A device for diagnosing the condition of copy substrate sensors including a transparent test document supposing a plurality of stripes of predetermined optical density The stripes are arranged in descending optical density about a stripe of maximum density and a transporter conveys the test document into communication with the optical path of each sensor. Circuitry responds to the stripes of predetermined optical density to provide a timing pulse of response of each sensor to the test document. The timing pulse is a. digital step pulse identifying the range of optical sensitivity each sensor and the step pulse represents a given set of stripes that provide a detector signal exceeding a threshold value.

REFERENCES:
patent: 3970393 (1976-07-01), Krygeris et al.
patent: 5075543 (1991-12-01), Courtney
patent: 5139339 (1992-08-01), Courtney

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