A reversal image development type electrophotographic printing system including a rotatable drum (1) coated with a light sensitive layer and an image developing roller (31) co-rotatable with the drum and using a printing medium composed of carriers and toner. To prevent superfluous toner during start-up,...http://www.google.com/patents/US4714942?utm_source=gb-gplus-sharePatent US4714942 - Reversal image development type electrophotographic printing system
