JP2010256397A - 光学走査装置及びそれを備えた画像形成装置 - Google Patents
光学走査装置及びそれを備えた画像形成装置 Download PDFInfo
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Abstract
【解決手段】コリメータレンズ41とシリンドリカルレンズ42との間に配置された平行透明板61を矢印BB′方向に傾斜させると、ビーム光D1、D2は光軸Oに対する平行状態を維持したまま、シリンドリカルレンズ42に対する副走査方向(矢印CC′方向)の入射位置のみが変化する。シリンドリカルレンズ42を通過した光は、シリンドリカルレンズ42に対する副走査方向の入射位置に関係なく偏向面44aの同一位置に結像するため、平行透明板61を矢印BB′方向に傾斜させることで、偏向面44aへ入射するビーム光D1、D2の入射角度を変化させることができる。
【選択図】図4
Description
1a〜1d 感光体ドラム(被走査面)
4 光学走査装置
40a〜40d 光源部
41 コリメータレンズ
42 シリンドリカルレンズ
44 ポリゴンミラー
44a 偏向面
45a、45b 第1走査レンズ
46a〜46c 平面ミラー
47a〜47d 第2走査レンズ
48 ハウジング
60 アパーチャ
61 平行透明板
100 画像形成装置
D1〜D4 ビーム光
Claims (4)
- 光源部と、
該光源部から射出されるビーム光を平行光束とするコリメータレンズと、
該コリメータレンズを通過したビーム光を副走査方向に収束させる単一のシリンドリカルレンズと、
該シリンドリカルレンズを通過したビーム光を偏向走査するポリゴンミラーと、
該偏向手段により偏向されたビーム光の光路に配置された走査レンズと、を備え、
前記ポリゴンミラーにより偏向走査されたビーム光を前記走査レンズにより結像させて被走査面上を走査する光学走査装置において、
前記コリメータレンズとシリンドリカルレンズとの間に、前記シリンドリカルレンズへのビーム光の副走査方向の入射位置を調整する平行透明板を配置したことを特徴とする光学走査装置。 - 前記光源部及び前記コリメータレンズを複数組備え、前記平行透明板は各光源部に対応して複数設けられることを特徴とする請求項1に記載の光学走査装置。
- 前記シリンドリカルレンズと前記ポリゴンミラーとの間に折り返しミラーを配置したことを特徴とする請求項1又は請求項2に記載の光学走査装置。
- 請求項1乃至請求項3のいずれかに記載の光学走査装置が搭載された画像形成装置。
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