Camera tube with graduated concentration of tellurium in target

Details Camera tube with graduated concentration of tellurium in target Camera tube with graduated concentration of tellurium in target

1979-04-18

1981-03-03

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Image pickup tube

H01J 2945, H01J 3138

Patent

active

042543592

ABSTRACT:
A camera tube having an electron source and a target to be scanned on one side by an electron beam emanating from the source. The target comprises a signal electrode and a selenium-containing vitreous layer containing tellurium, in a concentration which varies in the direction of the thickness of the selenium-containing layer, and arsenic. The selenium-containing layer is on the side of the target to be scanned by the electron beam, the signal electrode is on the side of the target to receive radiation. The tellurium concentration in the selenium-containing layer increases from the radiation-receiving side of the layer to the side which is scanned by the electron beam in such manner that over a distance of at most 0.3 microns from the radiation-receiving side, the concentration reaches a value of at least 41/2 atomic % and the arsenic concentration uniformly exceeds 11/2 atomic %.

REFERENCES:
patent: 3890525 (1975-06-01), Hirai et al.
patent: 4007395 (1977-02-01), Nonaka et al.
"New Photoconductive Camera Tube, Saticon", by N. Goto et al., NHK Laboratories Note No. 170, Sep. 1973.
"Saticon: A New Photoconductive Camera Tube with Se-As-Te Target" by N. Goto et al., IEEE Transactions on Electron Devices, vol. ed. 21, No. 11, pp. 662-666, Nov. 1974.

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