Color electrophotography using encoded multicolor information
US3972716A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1972 |
| Grant date | Aug 3, 1976 |
| Priority date | — |
| Expiry date | Jan 24, 1992 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G13/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A system for electrostatic photography using a camera having an aperture formed in one side for imaging light onto a photoconductive insulating layer positioned and supported in the camera housing to permit formation of an electrostatic latent image on dielectric film. A contact charging plate including a conductive layer and the photoconductive insulating layer is positioned in the camera so that light passing through the aperture is imaged onto the photoconductive layer. A dielectric camera "film" is positioned adjacent the photoconductive insulating layer and the film and photoconductive layer are pressure biased against each other. A voltage pulse is applied between conductive layers on either side of the dielectric film and photoconductive layer during exposure of the photoconductive layer to an image to establish on the film an electrostatic latent image which is developed with toner marking particles. In one embodiment a color encoding spatial filter is interposed in the path of light imaged on the photoconductive layer for color encoded electrostatic photography. In a preferred form, transparent film is used for developing image transparencies and subsequent printing in bla…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.