Abstract: Disclosed is an image forming apparatus of a type, in which there is provided first and second electrically chargeable members, a first processing device to form a primary electrostatic latent image on the first chargeable member, a second processing device to form a secondary electrostatic latent image of the second chargeable member in accordance with the primary electrostatic latent image, to develop the secondary electrostatic latent image, and to transfer the thus developed image onto an image transfer material. A detecting device is provided to detect the visible image forming capability of at least one of electrostatic latent images; and, a control device is provided, responsive to the detecting device, to control at least one of the first and second processing devices so as to form a developed image of a predetermined image density.

Abstract: In an electrophotographic method wherein a photosensitive screen having a multitude of tiny openings and formed by the use of a photoconductive member is used to form a primary electrostatic latent image thereon and a corona ion flow from a corona discharger is modulated by the primary electrostatic latent image to form a secondary electrostatic latent image on an electrically chargeable member, an acceleration field having a voltage Ve applied between the screen and the chargeable member is set to a range which satisfies the relation that (Ve-Vs)/d>500[V/mm], where d is the distance between the screen and the chargeable member, and Vs is the maximum potential of the secondary electrostatic latent image formed on the chargeable member.