Electrophotographic photosensitive member, process cartridge, and electrophotographic apparatus

A process cartridge integrally supporting an electrophotographic photosensitive member and at least one unit selected from the group consisting of a charging unit, a developing unit, a transfer unit and a cleaning unit, the process cartridge being detachably attachable to a main body of an electrophotographic apparatus,

• the electrophotographic photosensitive member comprising a cylindrical support, a charge generating layer formed on the cylindrical support, and a charge transport layer formed on the charge generating layer, wherein
• d11<d12<d13<d14<d15 where d11, d12, d13, d14 and d15 are respectively average film thicknesses (μm) of the charge generating layer divided into five equal regions from a central position to an end position of the image forming region in an axis direction of the cylindrical support in order from the central position towards the end position,
• d21>d22>d23>d24>d25 where d21, d22, d23, d24 and d25 are respectively average film thicknesses (μm) of the charge transport layer divided into five equal regions from the central position to the end position in order from the central position towards the end position, and
• each of d11×d21, d12×d22, d13×d23, d14×d24, and d15×d25 is 1.0 to 3.0.

An electrophotographic apparatus, comprising:

• an electrophotographic photosensitive member including a cylindrical support, a charge generating layer formed on the cylindrical support, and a charge transport layer formed on the charge generating layer;
• a charging unit;
• an exposing unit;
• a developing unit;
• and
• a transfer unit, wherein
• d11<d12<d13<d14<d15 where d11, d12, d13, d14 and d15 are respectively average film thicknesses (μm) of the charge generating layer divided into five equal regions from a central position to an end position of the image forming region in an axis direction of the cylindrical support in order from the central position towards the end position,
• d21>d22>d23>d24>d25 where d21, d22, d23, d24 and d25 are respectively average film thicknesses (μm) of the charge transport layer divided into five equal regions from the central position to the end position in order from the central position towards the end position, and
• each of d11×d21, d12×d22, d13×d23, d14×d24, and d15×d25 is 1.0 to 3.0.