Electrophotographic apparatus and process cartridge

An electrophotographic apparatus, comprising:

• an electrophotographic photosensitive member having a cylindrical shape;
• a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member;
• a developing unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to develop a toner image on the electrophotographic photosensitive member;
• and
• a transferring unit configured to transfer the toner image onto a transfer material,
• the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order,
• the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3):
• L1<L5<L3 (1);
• L1>L2 (2);
• and
• L1>L4 (3),
• where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area,
• L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a transferring area,
• L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed,
• L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and
• L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a developing area.

A process cartridge, which is configured to be removably mounted to a main body of an electrophotographic apparatus, the process cartridge comprising:

• an electrophotographic photosensitive member having a cylindrical shape;
• a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member;
• and
• a cleaning unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to clean a surface of the electrophotographic photosensitive member,
• the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order, and having a transferring area to be opposed to a transferring unit configured to transfer a toner image onto a transfer material,
• the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3):
• L1<L5<L3 (1);
• L1>L2 (2);
• and
• L1>L4 (3),
• where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area,
• L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of the transferring area,
• L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed,
• L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and
• L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a cleaning area.

A process cartridge, which is configured to be removably mounted to a main body of an electrophotographic apparatus, the process cartridge comprising:

• an electrophotographic photosensitive member having a cylindrical shape;
• a charging unit, which is arranged in a non-abutment manner with respect to the electrophotographic photosensitive member, and is configured to charge the electrophotographic photosensitive member;
• and
• a developing unit, which is arranged in abutment against the electrophotographic photosensitive member, and is configured to develop a toner image on the electrophotographic photosensitive member,
• the electrophotographic photosensitive member comprising a charge generating layer and a surface layer in this order, and having a transferring area to be opposed to a transferring unit configured to transfer the toner image onto a transfer material,
• the electrophotographic photosensitive member satisfying Expression (1), Expression (2), and Expression (3):
• L1<L5<L3 (1);
• L1>L2 (2);
• and
• L1>L4 (3),
• where L1 represents a width from a center of an image forming area in a longitudinal direction of the electrophotographic photosensitive member to an end of a charging area,
• L2 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of the transferring area,
• L3 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a surface layer formed area in which the surface layer is formed,
• L4 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a charge generating layer formed area in which the charge generating layer is formed, and
• L5 represents a width from the center of the image forming area in the longitudinal direction of the electrophotographic photosensitive member to an end of a developing area.