Light beam scanning apparatus

Details Light beam scanning apparatus Light beam scanning apparatus

1988-12-08

1990-06-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

358481, H01J 314

Patent

active

049335499

ABSTRACT:
A multi-beam detecting apparatus adapted to an optical system in which a recording medium is scanned by a plurality of light beams emitted from respective light sources, includes a photodetector, a light interrupting member, and a control circuit. The photodetector produces detection signals when the corresponding light beams come to a predetermined position. The light interrupting member is interposed between the light sources and the light detecting member, and has transparent portions related to the respective light beams. A controlling circuit controls ON/OFF states of the light source in accordance with the respective detection signals related to the corresponding light beams passing through the respective transparent portions in the light interrupting member.

REFERENCES:
patent: 4423426 (1983-12-01), Kitamura
patent: 4667099 (1987-05-01), Arai et al.

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