X-ray imaging tube and method of manufacturing the same with col

Details X-ray imaging tube and method of manufacturing the same with col X-ray imaging tube and method of manufacturing the same with col

1991-10-17

1992-11-24

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313525, H01J 3150

Patent

active

051665123

ABSTRACT:
An X-ray imaging tube which comprises a vacuum envelope, an input screen comprising a substrate located in the input end of the envelope, an input phosphor layer formed on the substrate and comprising a number of columnar phosphor crystals, and a photoelectric layer formed directly or indirectly on the input phosphor layer, an anode and an ouput screen located in the output end of the envelope, and a beam-converging electrode located in the envelope and extending along the inner surface of the envelope. The tube further comprising optically opaque layers which are formed in each columnar crystal and extending from the surface thereof. A method of manufacturing an X-ray imaging tube, disclosed herein, comprises the steps of vapor-depositing a predetermined phosphor on a substrate, thereby forming on the substrate an input phophor layer consisting of columnar crystals, vapor-depositing a predetermined material, thereby forming an optically opaque layer on the tip of each columnar crystal, sputtering the optically opaque layer, thereby removing a part of the optically opaque layer formed on the tip of the columnar crystal, vapor-depositing said predetermined phosphor, and, if necessary, repeating these steps, thereby forming a plurality of optically opaque layers in each columnar crystal, which extend from circumferential surface of the columnar crystal.

REFERENCES:
patent: 3852133 (1974-12-01), Houston
patent: 4011454 (1977-03-01), Lubowski et al.
patent: 5029247 (1991-07-01), Anno et al.

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