Image formation method and apparatus in which imaging light and conductive toner are applied to opposite surfaces of a photosensitive member

Apparatus for forming a toner image on a photosensitive member, the image corresponding to light information applied to the photosensitive member, said apparatus comprising:

• a two-sided photosensitive member having a photoconductive layer and a conductive layer;
• means for applying light information from the conductive layer side of said photosensitive member;
• means for supplying conductive toner to the photoconductive layer side of said photosensitive member and opposite to the side to which the light information is applied;
• means for applying a bias voltage between the conductive layer and the toner, said photoconductive layer having the property that at the region where the light information is applied, carriers having a polarity opposite to the polarity of the applied toner move toward the applied toner;
• and
• means for terminating the application of light information before separating the toner supply, by said supplying means, from the photosensitive member.

Apparatus for forming a toner image on a photosensitive member, the image corresponding to light information applied to the photosensitive member, said apparatus comprising:

• a movably supported two-sided photosensitive member having an inner conductive layer and an outer photoconductive layer;
• means for exposing a light image at the conductive layer side of said photosensitive member;
• means for supplying conductive toner to the photosensitive member at the outer peripheral surface side thereof and opposite to the exposing position of said exposing means;
• means for applying a bias voltage between the conductive layer of said photosensitive member and the toner, said photoconductive layer of the photosensitive member having the property that at the region where light is applied, carriers having a polarity opposite to the polarity of the applied toner move toward the applied toner to form a toner image corresponding to the light information;
• means for terminating the exposure of a light image before separating the toner supply, by said supplying means, from the photosensitive member;
• and
• a housing having an optical aperture for observing the toner image formed on said photosensitive member.