An apparatus for producing a bias voltage for use in an electrophotographic copying machine including a developing electrode, which apparatus assures a bias potential of a proper magnitude in response to a variation in the amount of light emitted by a light source of an exposure optical system. The apparatus...http://www.google.fr/patents/US4128329?utm_source=gb-gplus-shareBrevet US4128329 - Apparatus for producing bias voltage for use in electrophotographic copying machines
Apparatus for producing bias voltage for use in electrophotographic copying ...
