| 摘要 |
<p>The invention relates to persistent screens where the image to be stored is stored in a layer (3) which contains as an active substance an illuminable luminophor (5) and which is tinted to increase the picture sharpness. The luminophor (5) is a rather small quantity of organic and/or inorganic UV luminophor material. In this connection, it has been found to be desirable to at least reduce the light loss caused by the tinting. To this end, the invention avoids dispersions of the scanning beam (14) in the persistence layer (3) during scanning by admixing to the luminophor (5) an UV luminophor (6) as well as an optical brightener (7). It has also been found appropriate to apply the persistence layer (3) on a substrate (2), such as a polyester foil, which is tinted with a substance that absorbs the light of the scanning beam (14) used for illuminating the layer (5). Such a screen utilizing the inventive principles is particularly useful in medical technology applications.</p> |
