Method and apparatus for reducing the density of background areas without affecting the density of picture areas in an electronradiograph
US3949222A · kind A · utility
3Cited by
3References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1974 |
| Grant date | Apr 6, 1976 |
| Priority date | — |
| Expiry date | Nov 1, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G15/045
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Apparatus and method for improving an electron radiograph by reducing the charge density in the background area of the electrostatic image and thereby reducing the amount of toner attracted to such areas during developing. The latent electrostatic image is generated by exposure to a radiation source in an imaging chamber and the higher charge densities are then neutralized by exposing the electrostatic image to an ion discharge, with a bias potential for limiting the neutralizing action, after which the electrostatic image is developed into a visual image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.