Variable scanning speed optical scanning device
AssigneeHitachi, Ltd.
InventorsSeizi Maruo, Yasuro Hori, Yasuaki Suzuki
Life of this patent
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Abstract
An optical scanning device which can prevent increase of the weight or capacity involved with distortion correction to sufficiently correct the distortion at low cost. A correction arrangement is provided to control the rotating angular velocity of a scanning rotary mirror in accordance with the scanning position of a scanning face. By controlling the rotating angular velocity of the scanning rotary mirror, the distortion aberration on the scanning face is corrected so that sufficiently accurate optical scanning can be performed without optically correcting the distortion aberration.
Claims4
An optical scanning device wherein a part of an optical path from a light source to a scanning face is deflected by rotating a scanning rotary mirror so as to linearly scan the scanning face with a light spot, the optical scanning device comprising angular velocity control means for controlling a rotary angular speed of the scanning rotary mirror in accordance with a scanning position on the scanning face, the rotating angular velocity control means including correcting means for generating at least one of magnetic power and friction power, the correcting means adding at least one of a positive and a negative driving force changing in accordance with the scanning position on the scanning face to a predetermined rotary driving source supplied to a rotary shaft of the scanning rotary mirror.
Dependencies are inferred from the claim text.