Antonelli, Terry, Stout & Kraus
Variable scanning speed optical scanning device
 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. 
Hitachi, Ltd.
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Yasuaki Yasuro Seizi
Suzuki Hori Maruo