Method for the production of a radiographic screen
US5296117A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 1992 |
| Grant date | Mar 22, 1994 |
| Priority date | — |
| Expiry date | Dec 1, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG21K2004/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A method for the production of a radiographic screen comprising the following steps: PA0 1) dispersing phosphor particles in an organic liquid in the presence of a charge controlling agent that charges said phosphor particles with a positive or negative net charge, PA0 2) arranging said dispersion between a pair of electrodes, wherein one of said electrodes is or carries a conductive support of said radiographic screen, PA0 3) applying and maintaining between said electrodes a sufficiently high direct current voltage to deposit charged phosphor particles onto said conductive support, and PA0 4) separating said support carrying electrophoretically deposited phosphor particles from said organic liquid, wherein the dispersing of said phosphor particles proceeds by means of an organic surface active compound acting as dispersing agent for said phosphor particles, and said phosphor particles are electrostatically charged through adsorption thereon of ionic components of said organic surface active compound and/or through adsorption of cations or anions stemming from an ionic inorganic compound incorporated in said liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.