IMAGE FORMATION APPARATUS AND PROCESS CARTRIDGE

PROBLEM TO BE SOLVED: To provide an image formation apparatus that suppresses occurrence of an image defect caused by dielectric breakdown at an axial end of an electrophotographic photoreceptor.SOLUTION: There is provided an image formation apparatus such that a contact area of a photoreceptor and a cleaning member 131 in an axial direction of a photoreceptor 7 is wider than a contact region of the photoreceptor and an electrostatic charging member 8, a total film thickness maximum part having a largest total film thickness of an organic material layer is in a non-contact region for the cleaning member at both axial ends of the photoreceptor, and 0.97≤d'/d≤1.03, 0.97≤d''/d≤1.1 and 1.03≤d''max/d≤1.1 all hold for a total film thickness d' of the organic material layer of the photoreceptor in a region A from an end of the contact region for the electrostatic charging member to an end of a contact region for the cleaning member, a total film thickness d'' of the organic material layer in a region B from an end of the contact region for the cleaning member to the maximum total film thickness part, and a total film thickness d''max of the maximum total film thickness part of the organic material layer.SELECTED DRAWING: Figure 4 【課題】電子写真感光体の軸方向端部における絶縁破壊に起因する画像欠陥の発生が抑制される画像形成装置を提供する。【解決手段】感光体７の軸方向における感光体とクリーニング部材１３１との接触領域が、感光体と帯電部材８との接触領域よりも広く、感光体の軸方向の両端部において、有機物層の総膜厚が最も大きい総膜厚最大部をクリーニング部材との非接触領域に有し、帯電部材との接触領域の端部からクリーニング部材との接触領域の端部までの領域Ａにおける感光体の有機物層の総膜厚をｄ'、クリーニング部材との接触領域の端部から総膜厚最大部までの領域Ｂにおける有機物層の総膜厚をｄ''、有機物層における総膜厚最大部の総膜厚をｄ''ｍａｘ、としたときに、０．９７≦ｄ'／ｄ≦１．０３、０．９７≦ｄ''／ｄ≦１．１、１．０３≦ｄ''ｍａｘ／ｄ≦１．１ の関係を全て満たす画像形成装置。【選択図】図４