| 摘要 |
A camera tube target (9) which is to be scanned on one side by an electron beam (20), comprises a selenium-containing vitreous layer (21) also containing tellurium and arsenic. In order to improve various target characteristics and properties in accordance with the invention, the concentration of at least one of the elements tellurium and arsenic in a first sub-layer (25) of the selenium-containing layer (21), on the side to be scanned, increases toward the side to be scanned to a value at which the sum of the concentrations of tellurium and arsenic is at most 30 at. %. The arsenic concentration everywhere in the layer (21) exceeds 1.5 at. %. In a second sub-layer (26) adjoining the first sub-layer (25) the concentration of at least one of the elements arsenic and tellurium is smaller than its concentration an adjoining third sub-layer (27). A fourth sub-layer (28) may also be present between the third sub-layer (27) and the signal electrode (22). The concentration of arsenic and/or tellurium in the third sub-layer (27) is larger than its concentration in the fourth sub-layer. |
