Radiological image intensifier tube having an aluminum layer
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United States of America Patent
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Nov 9, 1999
Grant Date -
N/A
app pub date -
Dec 24, 1997
filing date -
Dec 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The disclosure relates to radiological image intensifier tubes comprising a vacuum electron tube and a luminescent observation screen comprising means to improve the contrast of the image. These means consist of a layer of aluminium with a thickness of at least 1 micrometer, partially absorbent for the incident electrons, placed in the path of the electrons generated by the tube and in the vicinity of the layer of luminophores. The deposited layer has the effect of reducing, firstly, the quantity of electrons re-emitted from the observation screen to the tube and, secondly, the proportion of these electrons that return to strike the layer of luminophores. Application to radiological type image intensifier tubes.
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