Xeroprinting master and process
US4047945A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 1975 |
| Grant date | Sep 13, 1977 |
| Priority date | — |
| Expiry date | Feb 18, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S430/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A xeroprinting master capable of preparation of multiple copies of an original without reimaging and without permanent modification of the master itself. This xeroprinting master consists essentially of a conductive base member, a non-persistent photoconductive insulating layer, a persistent photoconductive insulating layer and a dielectric layer; these layers being arranged relative to one another in the order of their listing. A latent electrostatic image can be created upon the surface of the dielectric layer by initially exposing the persistent photoconductive insulating layer to an image pattern, sensitizing the surface of the dielectric layer in the dark by charging to a constant surface potential, followed by blanket exposure of the non-persistent photoconductive insulating layer; the wavelength of light used in blanket exposure of the non-persistent photoconductive insulating layer being substantially non-activating of the persistent photoconductive insulating layer. Upon collapse of the field across the non-persistent photoconductive layer, a latent image pattern is generated upon the surface of the dielectric film. This image pattern can be rendered visible by development…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.