US 5,394,226 A · Method for reducing high quality electrophotographic images

Abstract

It has been determined that the two systems that contribute to edge raggedness in producing electrophotographic images are the development and transfer systems. Conventional development systems cause wrong sign toner to be attracted to the edges of the formed characters. Conventional transfer systems utilize electrostatic transfer whereby large electric fields are applied across a small air gap. In order to reduce edge raggedness, wrong sign toner is eliminated during the development step by using tribolelectrically charged toner and electrostatic transfer is replaced with non-electrostatic transfer techniques, either thermal or pressure, or combinations thereof. In either event, the resistivity of the intermediate surface is preferably 10.sup.10 ohm-cm or lower. Significantly improved electrophotographic images result.

Claims13

Dependent claims

A method of producing electrophotographic characters on a receiving surface with minimal edge raggedness, the method comprising the steps of:

(a) producing a latent image on an image-receiving substrate;
(b) providing toner and charging the toner tribo-electrically;
(c) applying the tribo-electrically charged toner to the latent image on the image-receiving substrate and thereby developing the latent electrostatic image on the image-bearing substrate to create a developed image;
(d) transferring the developed image by other than electrostatic means to a receiving surface composed of a semi-conductive material having a resistivity of approximately 10.sup.10 ohm-cm or lower;
and
(e) selecting the toner so as to minimize the inclusion of wrong sign toner in the development system.

3 more elements

Dependencies are inferred from the claim text.

Method for reducing high quality electrophotographic images

Life of this patent

Method for reducing high quality electrophotographic images

Life of this patent

Abstract

Claims13