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US 6,147,446 AGranted
Image converter tube with means of prevention for stray glimmer
AssigneeThomson Tubes Electroniques
InventorPhilippe Pradere
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Abstract
Disclosed is an improvement in image converter tubes that convert the X-ray image given by their input screen into a visible image. Stray glimmer develops on the insulators inside these tubes and the disclosure makes it possible to eliminate this glimmer by the deposition, on the insulators, of a thin layer of a product such as diamond-like carbon having a low secondary electron emission rate. Metal oxides are also suitable for this purpose. Application to image intensifiers.
Claims7
An image converter tube including a vacuum chamber and within the vacuum chamber comprising:
- an input screen including a scintillator and a photocathode, for converting input X-rays into electrons;
- an output screen for receiving the electrons generated by the input screen;
- an electronic optical unit for focusing the electrons onto the output screen, the electronic optical unit comprising:
- a plurality of electrodes;
- a plurality of insulating parts fixing the plurality of electrodes;
- and
- a thin layer of amorphous diamond-like carbon formed to cover the plurality of insulating parts.
4 more elements
Dependencies are inferred from the claim text.