Optical scanning device and image forming apparatus using the same

Abstract

Abstract Translated from Japanese 【課題】回転多面鏡の面倒れによるピッチムラを低減し、高精細な画像を容易に得ることができる光走査装置及びそれを用いた画像形成装置を得ること。 【解決手段】光源手段１から発せられた光束を偏向する回転多面鏡から成る偏向手段５と、該偏向手段により偏向された光束を被走査面８上に導光する走査光学系６１と、を具備する光走査装置において、該回転多面鏡の外接円の直径をＤ（ｍｍ）、該回転多面鏡の偏向面の面数をＭ、光束の走査中心を走査しているときの偏向面への入射角度をα（ｒａｄ）、偏向面が有効走査範囲を走査するときの最大振り角度をθ（ｒａｄ）、走査光学系の副走査断面内の倍率をβとするとき、条件式（１）を満足するように各要素を設定すること。 【選択図】 図１Ａ An optical scanning device capable of reducing pitch unevenness due to surface tilt of a rotary polygon mirror and easily obtaining a high-definition image, and an image forming apparatus using the same. A deflecting means comprising a rotary polygon mirror for deflecting a light beam emitted from a light source means, and a scanning optical system for guiding a light beam deflected by the deflecting means onto a surface to be scanned are provided. In the optical scanning device provided, the diameter of the circumscribed circle of the rotary polygon mirror is D (mm), the number of deflecting surfaces of the rotary polygon mirror is M, and the deflecting surface when scanning the scanning center of the light beam is adjusted. When the incident angle is α (rad), the maximum swing angle when the deflecting surface scans the effective scanning range is θ (rad), and the magnification in the sub-scanning cross section of the scanning optical system is β, conditional expression (1) is satisfied. Set each element to satisfy. [Selection diagram] FIG. 1A

Inventors

• 👤 Ken Tanimura
• 👤 憲 谷村
• 👤 Hidekazu Shimomura
• 👤 秀和 下村

Bibliographic Details