IMAGE WRITING DEVICE, IMAGE WRITING METHOD AND IMAGE FORMATION APPARATUS

PROBLEM TO BE SOLVED: To provide an image writing device which reduces the influence with the temperature change due to lighting in image writing without increasing the adjustment time at the time of automatic light quantity setting even in a case of including a plurality of laser diodes.SOLUTION: An image writing device comprises: a plurality of laser diodes 211, 212, 213, 214 which form electrostatic latent images in an effective scan region of a photoreceptor; storage means 260 which stores the lighting time of at least one scanning in each lighting time of the light-emitting diodes; and automatic light quantity control means 230 which individually executes automatic light quantity setting processing of the plurality of laser diodes for each laser diode in a non-effective scan region of the photoreceptor. The automatic light quantity control means 230 performs automatic light quantity setting processing from the laser diode with the shortest lighting time of one scanning immediately before the automatic light quantity control on the basis of the lighting time of each laser diode acquired from the storage means 260.SELECTED DRAWING: Figure 1 【課題】複数のレーザーダイオードを備える場合であっても、自動光量設定の際、調整時間を増すことなく画像書込での点灯に起因する温度変化による影響を軽減する画像書込装置を提供する。【解決手段】感光体の有効走査領域に静電潜像を形成する複数のレーザーダイオード２１１、２１２、２１３、２１４と、発光ダイオードの各点灯時間のうち少なくとも走査１回分の点灯時間を記憶する記憶手段２６０と、感光体の非有効走査領域内において、複数のレーザーダイオードの自動光量設定処理をレーザーダイオードごとに個別に実行する自動光量制御手段２３０と、を備え、自動光量制御手段２３０は、記憶手段２６０から取得した各レーザーダイオードの点灯時間に基づいて自動光量制御を行う直前における１回の走査中での点灯時間が最も短いレーザーダイオードから自動光量設定処理を行う。【選択図】図１