Browse Prior Art Database

Original Publication Date: 1977-Apr-30
Included in the Prior Art Database: 2004-Mar-29

Publishing Venue

Xerox Disclosure Journal


An induction imaging method and apparatus wherein an electro-static image is formed on a thin dielectric web which can be stored and/or redeveloped virtually without limit and which avoids air breakdown problems is disclosed. An electrostatic image 12 is first placed on a photoconductive surface 10. A dielectric web 11 is positioned against the surface having the electrostatic image while a potential is applied to the web by corona device 16, the potential being opposite in polarity to the potential of the electrostatic image so that an induced electrostatic latent image is formed on the web. The web is then positioned in contact with the photoconductive surface and a conductive roller 18, the roller being biased at a potential sufficient to prevent charge transfer from the sur-face to the web, and the web is separated from the surface onto the roller. Thereafter, the web is positioned in contact with roller 18 and a biased gravure development roller 19 con-taining a liquid developing ink 20, whereby development of the induced latent image occurs on surface 17 of the web opposite to surface 15 containing the induced image. The developed image on the web is subsequently transferred to a receiving member 24 arid the web is cleaned by doctor blade 27. To pro-duce a plurality of final copies without the necessity of separately forming the electrostatic latent image on the di-electric web for each copy, surface 15 of the web containing the induced latent image is brought against conductive roller 18 having an insulating coating thereon. As the web is passed around the conductive roller, a charge is placed on surface 17 of the web opposite to the surface containing the latent image by corona device 32, of sufficient magnitude to neutralize the charges on the opposite surface of the web. The charges which are neutralized are those placed on the opposite surface of the web by the charged particles in the liquid ink.