Optical scanning apparatus
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United States of America Patent
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May 7, 2013
Grant Date -
Dec 10, 2009
app pub date -
Jun 3, 2009
filing date -
Jun 6, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical scanning apparatus includes a light source which emits an optical beam, a deflection scanning unit, and a control unit. The deflection scanning unit includes a rotating polygonal mirror which deflection-scans the optical beam emitted from the light source so that the optical beam will scan an object to be scanned, and a drive unit which rotationally drives the rotating polygonal mirror. The control unit controls the rotational speed of the rotating polygonal mirror by accelerating or decelerating the drive unit at a predetermined time during one rotation of the rotating polygonal mirror. The predetermined time is a time when a deviation in length of a scanning line formed by each reflecting surface of the rotating polygonal mirror becomes relatively small.
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