US4437011A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation excited phosphor screen and method for manufacturing the same
Assignee: Toshiba Corp
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Filing: 1981-06-11
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Granted: 1984-03-13
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Expires: 2001-06-11
Abstract
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.
Inventors
- 👤 Takashi Noji
- 👤 Norio Hapao
- 👤 Yoshiharu Obata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:33
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385; G; G21; G21K; G21K4/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
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 μm 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.
Claim 2
Dependent Claim
99 words
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 μm 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.
Claim 3
Dependent Claim
28 words
A phosphor screen according to claim 1, wherein said first phosphor layer and said second phosphor layer are made of the same kind of alkali halide phosphor material.
Claim 4
Dependent Claim
16 words
A phosphor screen according to claim 2, wherein said alkali halide phosphor material is cesium halide.
Claim 5
Dependent Claim
23 words
A phosphor screen according to claim 3, wherein the total thickness of said first and second phosphor layers is 100 to 400 μm.
Claim 6
Dependent Claim
55 words
A phosphor screen according any one of claims 1 to 4, further comprising a third phosphor layer which is vapor-deposited to a thickness of 30 μm or less on said second phosphor layer in such a manner as to be continuous and to seal said fine spaces between said columnar crystals at the tops thereof.
Claim 7
Dependent Claim
20 words
A phosphor screen according to claim 5, wherein said third phosphor layer is made of an alkali halide phosphor material.
Claim 8
Dependent Claim
16 words
A phosphor screen according to claim 6, wherein said alkali halide phosphor material is cesium iodide.
Claim 9
Dependent Claim
28 words
A phosphor screen according to claim 7, further comprising a transparent conductive layer vapor deposited on said third phosphor layer to a thickness of 5,000 Å or less.
Claim 10
Dependent Claim
17 words
A phosphor screen according to claim 8, wherein said transparent conductive layer is made of indium oxide.
Claim 11
Dependent Claim
31 words
A phosphor screen according to claim 9, further comprising a protective layer vapor-deposited between said third phosphor layer and said transparent conductive layer to a thickness of 200 to 1,000 Å.
Claim 12
Dependent Claim
16 words
A phosphor screen according to claim 10, wherein said protective layer is made of aluminum oxide.
Claim 13
Dependent Claim
16 words
A phosphor screen according to claim 11, further comprising a photoemissive layer on said conductive layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |