Light beam scanning apparatus
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United States of America Patent
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-
Jun 12, 1990
Grant Date -
N/A
app pub date -
Dec 8, 1988
filing date -
Dec 11, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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