Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-07-11
1990-06-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
271263, G01N 2186
Patent
active
049374605
ABSTRACT:
An optoelectronic triangulation sensor mounted adjacent a path of travel of a material web or individual paper sheets has a pivotable lever biased toward a fixed reference platen to bias the article(s) against the platen. The sensor light source is focused on a target carried on the back of the lever and reflected to a position-sensitive detector (e.g. lateral-effect photo-diode), the output of which varies in an analog signal in direct proportion to displacement of the lever. A relatively wide included angle between light source and PSD receiver shortens the range of the sensor and eliminates a need for pulse modulated light. The current driving the light source is monitored to emit a signal when the light source current exceeds a threshold, signaling the need for maintenance on the sensor such as cleaning the lens.
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Duncan Eugene F.
Nadolski Gregory L.
Van Zeeland Donald L.
Allen Stephone B.
Eaton Corporation
Nelms David C.
Vande Zande L. G.
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