Electrostatic cameras
US4295714A · kind A · utility
Inventor
Key dates
| Filing date | Feb 19, 1980 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Feb 19, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A portable camera is described by which electrostatic photocopies can be obtained instead of conventional photographs. The camera includes conventional aperture and optical focusing means for producing an image, a surface on which the image is formed, electrode means for electrically charging the surface, an integral EHT generator for producing a high voltage pulse for application to the electrode, a shutter for controlling the passage of light to the surface and a means for applying a printing medium to the surface for retention thereon in dependence on the level of electrical charge remaining at different points over the surface after exposure to the light image. Rollers and a reservoir of a suspension of printing medium particles serve to apply the printing medium to the surface and heated rollers or pressure rollers are used to fix the print. A development electrode may be employed in the form of a grounded conductive plate or roller placed in the immediate vicinity of the electrical image to eliminate edge effect. The surface on which the image is formed may comprise a zinc oxide coated paper or a plate coated with cadmium sulphide or selenium for producing an intermediate ele…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.