The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 16, 1994
Filed:
May. 22, 1992
Atsuya Yoshida, Ootawara, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An X-ray imaging tube has an input phosphor screen including a substrate, a discontinuous phosphor layer formed on the substrate, and a continuous phosphor layer formed on the discontinuous phosphor layer. The discontinuous phosphor layer consists of a large number of columnar crystals separated from each other and containing a substance for absorbing light emitted from a phosphor upon incidence of an X-ray. Light-absorbing layers containing a compound of the substance and having a concentration of the element higher on outer surfaces thereof than that in interiors thereof are formed on adjacent side surfaces of the columnar crystals such that the light-absorbing layers are not present at an interface between the discontinuous phosphor layer and the continuous phosphor layer. The gap between the adjacent side surfaces of the columnar crystals is 0.1 .mu.m or more.