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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.

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First Claim