A charging module for applying a uniform electrostatic charge to a charge retentive surface is provided. The charging module is operably electrically connectable to a power supply for supplying an electrical bias to the charging apparatus. The charging module is mountable into a process cartridge. The...http://www.google.es/patents/US5890035?utm_source=gb-gplus-sharePatente US5890035 - Charging device module for use with print cartridge
Charging device module for use with print cartridge
