X-ray image intensifier with unitary plate input phosphor screen

Details X-ray image intensifier with unitary plate input phosphor screen X-ray image intensifier with unitary plate input phosphor screen

1989-12-01

1992-01-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

313541, H01J 3150

Patent

active

050830171

ABSTRACT:
An X-ray image intensifier has an input phosphor screen with a substrate in which a large number of small holes are formed, and a fluorescent material filled in the small holes. A ratio of a maximum inner diameter to a depth of each small hole is set to be 0.5 or less. Alternatively, the input phosphor screen of the X-ray image intensifier of the invention includes a substrate in which a large number of small holes are formed, a low-refractive-index material layer formed on the inner wall of each small hole, and a fluorescent material having a refractive index higher than the low-refractive-index material layer filling each small hole. The input phosphor screen of the X-ray image intensifier of the invention is manufactured by forming a large number of small holes in a substrate composed of photosensitive glass, forming the substrate into an arcuated shape by hot pressing, converting the substrate into crystallized glass by a heat treatment, and obtaining an input phosphor screen by filling the small holes with a fluorescent material.

REFERENCES:
patent: 2827571 (1958-03-01), Klasens et al.
patent: 4611144 (1986-09-01), Minami
patent: 4847482 (1989-07-01), Kubo
patent: 4855589 (1989-08-01), Enck et al.
patent: 4893020 (1990-01-01), Ono
RCA Review-An X-Ray-Sensitive Fiber-Optic Intensifier Screen for Topography, R. W. Smith.

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