IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide an image forming apparatus configured to efficiently detect color misregistration even when an area for writing a color-misregistration detection pattern is reduced due to many belt curling deformations.SOLUTION: An image forming apparatus having an intermediate transfer belt 10 which carries toner images of multiple colors, a toner image detection sensor 41 which detects a color-misregistration detection pattern carried on the intermediate transfer belt 10, and color-misregistration detection means 106 which detects color misregistration. The image forming apparatus includes: a driving device 105 which changes an angle of the toner image detection sensor 41 with respect to the intermediate transfer belt 10; a change acquisition section 103 which changes the angle of the toner image detection sensor 41, and acquires changes in output value of the toner image detection sensor 41 due to belt curling deformation of the intermediate transfer belt 10; and correction means 104 which corrects the angle of the toner image detection sensor 41 during color-misregistration detection, on the basis of the changes in output value, so as to reduce the influence of the belt curling deformation of the intermediate transfer belt 10. 【課題】ベルト巻き癖が多数発生して、色ずれ検知パターンを書き込める領域が少なくなった場合でも、効率的な色ずれ検知ができる画像形成装置を提供する。【解決手段】複数色のトナー像を担持する中間転写ベルト１０と、中間転写ベルト１０上に担持された色ずれ検知パターンを検知するトナー像検知センサー４１と、色ずれの検出を行う色ずれ検知手段１０６と、を有する画像形成装置において、トナー像検知センサー４１の中間転写ベルト１０に対する角度を変更する駆動装置１０５と、トナー像検知センサー４１の角度を変更しつつ取得した中間転写ベルト１０のベルト巻き癖に起因するトナー像検知センサー４１の出力値の変化を取得する変化取得部１０３と、出力値の変化に基づいて、色ずれ検出時にトナー像検知センサー４１の角度を中間転写ベルト１０のベルト巻き癖の影響が小さくなる配置状態に補正する補正手段１０４と、を備える。【選択図】図１