Other

Kabushiki Kaisha Toshiba

Yoshinobu Sekijima

Takashi Noji

Hitoshi Yamada

Junji Taniguchi

Kazutoshi Tanno

Mitsumasa Hiroi

The object of the present invention is to provide a radioactive-ray image tube having less deformations, such as the twist of an input substrate, less aberration over the entire regions of an output image, excellent resolution and good brightness uniformity and contrast characteristics. This radioactive-ray image tube,comprises an input window,formed on one side surface of a vacuum vessel,and allowing radioactive-rays to enter the vacuum vessel,, an input screen,for converting the radioactive-rays incident on the input window,into a fluorescent image or a photoelectric image, and an input substrate,holding the input screen,is characterized in that the input substrate,comprises of a clad material,having an aluminum alloy material,on the radioactive-ray incidence side and a pure aluminum material,on the input screen,side provided integrally with each other.

Radioactive-ray image tube having input member formed of a clad material

The present invention assures a satisfactory adhesiveness of an input screen,of an X-ray image intensifier, high resolution of an output image and brightness uniformity as required, by configuring an aluminum or aluminum alloy substrate,so to have a concave surface with minute irregularities of the substrate material removed by burnishing, excepting gentle irregularities,without directivity which are caused by pressing. The gentle irregularities,of the substrate,preferably have an average length L in a range of 50 &mgr;m to 300 &mgr;m between the neighboring bottoms and an average height H in a range of 0.3 &mgr;m to 4.0 &mgr;m from peaks to bottoms. The invention improves resolution with light on the substrate surface suppressed from being scattered, and decreases image noises which are caused by the minute irregularities.

X-ray image intensifier and method for manufacturing thereof

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Otawara, Japan

Yoshinobu Sekijima