A nonimpact printer in which electric charges are distributed over the surface of an electrophotographic photosensitive drum by a corona charger, the corona charged surface of the drum is exposed to a first information light, the induced latent image is developed by toner of a first color, the corona...http://www.google.de/patents/US4416533?utm_source=gb-gplus-sharePatent US4416533 - Nonimpact printer
