Electrophotographic apparatus, process cartridge, and cartridge set

A process cartridge detachably provided to a main body of an electrophotographic apparatus, wherein

• the process cartridge comprises
• a charging unit for charging a surface of an electrophotographic photosensitive member, and
• a developing unit for developing an electrostatic latent image formed on the surface of the electrophotographic photosensitive member with a toner to form a toner image on the surface of the electrophotographic photosensitive member,
• the charging unit comprises a conductive member arranged to be capable of contacting the electrophotographic photosensitive member,
• the conductive member comprises a support having a conductive outer surface, and a conductive layer disposed on the outer surface of the support,
• the conductive layer comprises a matrix and a plurality of domains dispersed in the matrix,
• the matrix contains a first rubber,
• each of the domains contains a second rubber and an electronic conductive agent,
• at least some of the domains is exposed at the outer surface of the conductive member,
• the outer surface of the conductive member is composed of at least the matrix and the domains exposed at the outer surface of the conductive member,
• the matrix has a volume resistivity R1 of larger than 1.00×1012 Ω·cm,
• the domains have a volume resistivity R2 of smaller than the volume resistivity R1 of the matrix,
• the developing unit has the toner, and
• the toner has a dielectric loss tangent of at least 0.0027.

A cartridge set having a first cartridge and a second cartridge detachably provided to a main body of an electrophotographic apparatus, wherein

• the first cartridge comprises a charging unit for charging a surface of an electrophotographic photosensitive member, and comprises a first frame for supporting the charging unit,
• the second cartridge comprises a toner container that accommodates a toner for forming a toner image on the surface of the electrophotographic photosensitive member by developing an electrostatic latent image formed on the surface of the electrophotographic photosensitive member,
• the charging unit comprises a conductive member arranged to be capable of contacting the electrophotographic photosensitive member,
• the conductive member comprises a support having a conductive outer surface and, a conductive layer disposed on the outer surface of the support,
• the conductive layer comprises a matrix and a plurality of domains dispersed in the matrix,
• the matrix contains a first rubber;
• each of the domains contains a second rubber and an electronic conductive agent,
• at least some of the domains is exposed at the outer surface of the conductive member;
• the outer surface of the conductive member is composed of at least the matrix and the domains exposed at the outer surface of the conductive member,
• the matrix has a volume resistivity R1 of larger than 1.00×1012 Ω·cm,
• the domains have a volume resistivity R2 of smaller than the volume resistivity R1 of the matrix;
• and
• the toner has a dielectric loss tangent of at least 0.0027.