Optical scanner and image forming apparatus using the same
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United States of America Patent
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Jun 4, 2013
Grant Date -
Sep 15, 2011
app pub date -
Mar 10, 2011
filing date -
Mar 11, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
An optical scanner, which scans at least one scanned face by a light beam, includes a light source having a plurality of light emitting points, an optical system before a light deflector configured to form a plurality of light beams from the light source, a light deflector configured to deflect the light beams via the optical system before a light deflector and scan the deflected light beams, and a scanning optical system configured to focus on the scanned face the light beams deflected and scanned by a deflection face of the light deflector, the optical system before a light deflector including a first optical element having a negative power at least in a deflecting and scanning vertical direction, a second optical element having a power only in a deflecting and scanning direction and a third optical element having a power only in the deflecting and scanning vertical direction.
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