Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1997-01-28
1999-11-09
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250234, 358463, H01J 314
Patent
active
059819448
ABSTRACT:
An optical scanner reduces the effects of external electrical noise and disturbing light that leaks therein during an image read operation. Light beams emitted by a plurality of light sources are synthesized so as to travel along a common optical path, the synthesized light beams are deflected by a polygonal rotating mirror and condensed. The condensed light beams fall on a beam splitting device. One of the light beams is projected on the image forming surface of a photosensitive member for image recording, another light beam scans the image surface of a document, and light scattered by the light reflecting from the image surface of the document is detected by photoelectric devices. The light beam projected on the document is modulated by a modulator in accordance with a fixed frequency, and signals provided by the photoelectric devices are demodulated by a demodulator.
REFERENCES:
patent: 4327287 (1982-04-01), Saito et al.
patent: 4644341 (1987-02-01), Warner
patent: 5543955 (1996-08-01), Yamazaki et al.
patent: 5621205 (1997-04-01), Warner et al.
Brother Kabushiki Kaisha
Pyo Kevin
Westin Edward P.
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