Radiation excited phosphor screen and method for manufacturing the same
First Claim
1. A radiation excited input phosphor screen comprising:
- a substrate having a substantially smooth surface;
a first phosphor layer vapor-deposited on said smooth surface of said substrate and including phosphor crystal particles having mean diameter of 15 μ
m or less; and
a second phosphor layer of alkali halide phosphor material vapor-deposited on said first phosphor layer and including individual columnar crystals grown substantially vertically with respect to said smooth surface of said substrate, said columnar crystals standing close together with fine spaces therebetween, said second phosphor layer having a thickness ten or more times that of said first phosphor layer.
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Abstract
An input phosphor screen includes a substrate having a substantially smooth surface, and first and second phosphor layers both vapor-deposited sequentially on the substrate. The first layer is made of phosphor crystal particles having a mean diameter of 15 μm or less. The second layer has a thickness ten or more times that of the first layer and is made of individual columnar crystals of alkali halide grown vertically on the crystal particles, standing close together with fine spaces therebetween. A third layer is preferably deposited on the second layer as a continuous film. These three layers can be deposited by evaporating a phosphor material or materials at a prescribed temperature and at a predetermined degree of vacuum.
35 Citations
12 Claims
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1. A radiation excited input phosphor screen comprising:
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a substrate having a substantially smooth surface; a first phosphor layer vapor-deposited on said smooth surface of said substrate and including phosphor crystal particles having mean diameter of 15 μ
m or less; anda second phosphor layer of alkali halide phosphor material vapor-deposited on said first phosphor layer and including individual columnar crystals grown substantially vertically with respect to said smooth surface of said substrate, said columnar crystals standing close together with fine spaces therebetween, said second phosphor layer having a thickness ten or more times that of said first phosphor layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification