US 5,194,352 AGranted

Method for toner development of electrostatic latent image and for formation of toner image in which a specified gap is maintained between a photosensitive member and an electrostatic information recording medium

AssigneeDai Nippon Printing Co., Ltd.

InventorHiroyuki Obata

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Abstract

According to the present invention, the photosensitive member and the electrostatic information recording medium are immersed in the toner after image exposure is performed, and the electric field is formed in the gap by short-circuiting between the electrodes of the photosensitive member and the electrostatic information recording medium. Also, bias voltage is applied between the electrodes of the photosensitive member and the electrostatic information recording medium, and the surfaces of the electrostatic information recording medium and the photosensitive member are immersed in the toner. Bias voltage is set to higher than the potential on the unexposed portion and lower than the maximum potential of the exposed portion on the electrostatic information recording medium or the photosensitive member, and toner development of electrostatic latent image is performed with high fidelity on the photosensitive member to form positive or negative image.

Claims6

Dependent claims

A method for toner development of an electrostatic latent image, comprising the steps of:

providing a photosensitive member consisting of a photoconductive layer formed on a transparent electrode and a transparent support member supporting said transparent electrode;
providing an electrostatic information recording medium consisting of an insulating layer formed on a support member with a conductive layer therebetween;
placing said photosensitive member face-to-face with said electrostatic information recording medium with a predetermined gap therebetween;
applying a voltage between the conductive layers of said photosensitive member and said electrostatic information recording medium;
performing image exposure through said transparent support member, said transparent electrode, and said photosensitive member onto said electrostatic information recording medium to accumulate electric charge in the shape of an image on a surface of said electrostatic information recording medium;
removing the voltage applied between the conductive layers of said photosensitive member and said electrostatic information recording medium and electrically connecting said photosensitive member and said electrostatic information recording medium;
immersing at least the surfaces of said electrostatic information recording medium and said photosensitive member in the toner;
and
performing toner development on the immersed surfaces of said electrostatic information recording medium and/or said photosensitive member.

6 more elements

A method for toner development of an electrostatic latent image, comprising the steps of:

providing a photosensitive member consisting of a photoconductive layer formed on a transparent electrode and a transparent support member supporting said transparent electrode;
providing an electrostatic information recording medium consisting of an insulating layer formed on a support member with a conductive layer therebetween;
placing said photosensitive member face-to-face with said electrostatic information recording medium with a predetermined gap therebetween;
applying a voltage between the conductive layers of said photosensitive member and said electrostatic information recording medium;
performing image exposure through said transparent support member, said transparent electrode, and said photosensitive member onto said electrostatic information recording medium to accumulate electric charge in the shape of an image on a surface of said electrostatic information recording medium;
applying a bias voltage between the conductive layers of said photosensitive member and said electrostatic information recording medium;
and
immersing at least the surfaces of said electrostatic information recording medium and said photosensitive member in the toner.

5 more elements

Dependencies are inferred from the claim text.