Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-11-05
1993-05-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250561, G01J 132
Patent
active
052142710
ABSTRACT:
A method and apparatus for sensing the presence of a document moved to a printing station in a printer and for detecting skewness (if any) of the document at the printing station. A first light-detector pair and a second light-detector pair are used, with the sensitivity of each of the detectors in the light-detector pairs being adjusted each time the printer is turned on. A controller and a stored program are used to adjust the sensitivity of the detector along with a resistor network providing steps of resistance. The particular resistance step to which a detector is adjusted also gives a measure of the useful life left for the detector.
REFERENCES:
patent: 4359670 (1982-11-01), Hosaka et al.
patent: 4416524 (1983-11-01), Takayama
patent: 4593194 (1986-06-01), Graham et al.
patent: 4701669 (1987-10-01), Head et al.
patent: 5021676 (1991-06-01), Dragon et al.
Eberhardt George J.
Loughman Richard E.
Rogers Richard E.
Turvy, Jr. Larry D.
Lee John R.
NCR Corporation
Nelms David C.
Wargo Elmer
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