Apparatus for recording and reproducing an electrographic image

Details Apparatus for recording and reproducing an electrographic image Apparatus for recording and reproducing an electrographic image

1986-02-26

1986-08-05

Evans, A.

Recorders

Printing, dotting, or punching marker

Ink transfer support or moving means

346108, 250213VT, 250370, G01D 1514

Patent

active

046046348

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.

REFERENCES:
patent: 4201994 (1980-05-01), Hoshito et al.
patent: 4341954 (1982-07-01), Mizushima et al.
Journal of Applied Photographic Eng., A Method of Electronic Readout of Electrophotographic and Electroradiographic Images, Korn, et al., Fall 78, pp. 178-182.

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