Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-08-20
1995-01-31
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502141, 250235, G01N 2186, H01J 4014
Patent
active
053861230
ABSTRACT:
An apparatus and method for reliably monitoring the position of a radiant energy beam, for example, a scanning laser beam such as that produced by a raster output scanning system to expose a photoresponsive member, where the beam traverses the surface of a photoreceptive member at a high rate of speed. The apparatus, which includes a lateral-effect photodiode, is also capable of signaling when the radiant energy beam traverses a specific location. The apparatus may also be used to determine the relative intensity of the radiant energy beam, thereby significantly reducing the space and expense necessary to monitor the radiant energy beam by combining multiple sensing operation in a single apparatus.
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Hubble, III Fred F.
Martin James P.
Ossman Kenneth R.
Powers Edward A.
Allen S. B.
Basch Duane C.
Nelms David C.
Xerox Corporation
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