Device for electrostatographic reproduction of an optical image using a charge storage grid
US3994000A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 27, 1975 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | May 27, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J31/065
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Apparatus and method for converting an optical image into an electrostatic image replica. A vacuum tube device includes a source of electrons for propagating electrons toward an array of conductors coupling an interior surface of the vacuum tube device with an exterior surface. The accumulation of electrons on the conductor array produces an electrostatic image. The electrostatic image is determined by modulating a diffuse beam of electrons by means of the charge stored on a control grid. The charge stored on the control grid is established by secondary emission of electrons from an insulating material associated with the control grid. The electrons producing the secondary emission from the control grid originate from a photoemissive cathode are produced by the photoemissive cathode in response to an optical image applied to the cathode. The optical image applied to the photoemissive cathode is the image for which an electrostatic replica is desired. The photo-emissive cathode and the control grid are arranged so that an electron from a region of the photoemissive electrode impinges on an associated region of the control grid. By varying the accelerating potentials between the phot…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.