Camera tube

Details Camera tube Camera tube

H - Electricity

01

J

313/35.222

H01J 29/10 (2006.01) H01J 29/45 (2006.01)

Patent

CA 1149002

1 PHN 9416 ABSTRACT: A camera tube target which to be scanned on one side by an electron beam comprises a selenium-con- taining vitreous layer also containing tellurium and arsenic. In order to improve the sensitivity and reduce dark current various target characteristics in accord- ance with the invention, the concentration of at least one of the elements tellurium and arsenic in a first layer portion of the selenium-containing layer on the side to be scanned increases in the direction of thick- ness towards the side to be scanned to a value at which the sum of the concentrations of tellurium and arsenic on the side to be scanned is at most 30 at.%; the arsenic concentration everywhere in the selenium-con- taining layer exceeds 1.5 at.%; and in a second layer portion adjoining the first layer portion the concen- tration of at least one of the elements arsenic and tellurium has a minimum value with respect to an adjoin- ing third layer portion. A fourth layer portion may also be present between the third layer portion and the signal electrode, and the concentration of arsenic and/ or tellurium in the third layer portion may have a max- imum value with respect to the fourth layer portion.

349109

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