Process for reversal development using inductively chargeable magnetic powdery developer

摘要

A reversal developing process carried out preferably with an inductively chargeable magnetic powdery developer. An electrostatic latent image having first charged areas and second lesser charged areas formed on a photoreceptor or a photoconductor is developed negatively by forming a toner brush of single component, i.e., inductively chargeable, magnetic powdery developer on a shell incorporating a permanent magnet to adhere the developer on the first charged areas, charging uniformly the developed photoreceptor with the same polarity as the first charged area and further rubbing the surface of the photoreceptor with a second toner brush to remove the previously adhered developer from the surface and to adhere powdery developer onto the second lesser charged areas. The apparatus includes two applicators for powdery developer positioned along the path of movement of the latent image with a D.C. charger stationed between the applicators. In the preferred embodiment, the two applicators and charger are incorporated in a single device.