IMAGE FORMING APPARATUS

To suppress the excessive rise of a surface potential of an end portion in a longitudinal direction of a photoreceptor in a configuration where a contact area of a surface of the photoreceptor contacting with a transfer member is shorter than a contact area of the surface of the photoreceptor contacting with a charging member with respect to the longitudinal direction.SOLUTION: In an image forming apparatus 100, an end portion of a surface of a photoreceptor 1 in a rotational axis direction of a charging member 2 includes a non-transfer area E in contact with the charging member 2 and in no contact with a transfer member 5. A control portion 40 can perform exposure operation such that an exposure device 3 exposes at least the non-transfer area E of the photoreceptor 1 during rotation of the photoreceptor 1, and by the exposure operation, controls the exposure device 3 such that an absolute value of a surface potential of the photoreceptor 1, which is formed in the non-transfer area E, is smaller than an absolute value of a surface potential of the photoreceptor 1, which is formed in a transfer outside paper passing area F downstream of an exposure portion Pb and upstream of the transfer portion Nt in a rotational direction of the photoreceptor 1.SELECTED DRAWING: Figure 5 【課題】長手方向に関して感光体の表面の帯電部材との接触領域よりも感光体の表面の転写部材との接触領域の方が短い構成において、感光体の長手方向の端部の表面電位が過剰に上昇することを抑制する。【解決手段】感光体１の表面における帯電部材２の回転軸線方向の端部に、帯電部材２と接触しかつ転写部材５と接触しない非転写領域Ｅを有する画像形成装置１００は、制御部４０が、感光体１が回転している時に、露光装置３により少なくとも感光体１の非転写領域Ｅを露光する露光動作を実行可能であり、該露光動作により、感光体１の回転方向において露光部Ｐｂよりも下流かつ転写部Ｎｔよりも上流の、通紙外転写領域Ｆに形成される感光体１の表面電位の絶対値よりも、非転写領域Ｅに形成される感光体１の表面電位の絶対値の方が小さくなるように露光装置３を制御する構成とする。【選択図】図５