Apparatus for recording and reproducing an electrographic image
US4604634A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 26, 1986 |
| Grant date | Aug 5, 1986 |
| Priority date | — |
| Expiry date | Feb 26, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/30
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention concerns electroradiographic image recording and reproducing apparatus in which a radiation image is stored as an electrical charge pattern in a photoconductive layer (6). This image is then converted, by scanning with a beam of light (22), into a sequence of electrical signals which are picked up by strip electrodes (7) arranged on the photoconductive layer surface. The signal-noise ratio may be improved and a large number of amplifiers may be eliminated, according to the invention, by providing a discharge electrode (8) on the photoconductive layer (6) at a distance from the ends of strip electrodes (7). During read-out, the respective strip electrode (7) along which the scanning takes place is electrically connected with the discharge electrode (8) by illuminating (23) the intermediate space (25) between the latter and the strip electrode (7). Such an apparatus is useful, in particular, for the visual reproduction of X-ray images in medical X-ray diagnostics.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.