Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-02-24
1993-10-26
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
313384, 313375, 313379, H01J 3150
Patent
active
052568709
ABSTRACT:
An image intensifying tube, such as a image intensifying tube which converts X-rays into a visible image, comprises a curved input screen which comprises a substrate that receives input radiation and a photocathode supported on the substrate, and an output screen which converts the electrons emitted by the photocathode into a visible image. In order to compensate for changes in luminosity due to the curvature of the input screen, an intermediary layer of radially variable thickness is deposited between the substrate and the photocathode. The intermediary layer is made from a material, such as indium oxide (In.sub.2 O.sub.3), which modifies the electron emitting characteristics of the photocathode as a function of the thickness the intermediary layer. Thus, a thicker intermediary layer near the center of the input screen will compensate for reduced luminosity at the edges of the screen.
REFERENCES:
patent: 3706885 (1972-12-01), Fister et al.
patent: 3716713 (1973-02-01), Levin
patent: 3838273 (1974-09-01), Cusano
patent: 4831249 (1989-05-01), Van der Velden et al.
Chareyre Francois
Raverdy Yves
Tranchant Alain
Vieux Gerard
Le Que T.
Nelms David C.
Thomson Tubes Electroniques
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