US4504738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input screen for an image intensifier tube and a method of making the same
Assignee: Toshiba Corp
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Filing: 1982-12-03
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Granted: 1985-03-12
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Expires: 2002-12-03
Abstract
Abstract An input screen and method of forming one for an image intensifier tube including a substrate in which a plurality of crystal grains of aluminum or aluminum alloy are formed in a plane with the crystal grains having non-directional shapes in the plane. The crystal grains are formed by heating in a vacuum or non-oxidizing atmosphere at a temperature between 450° C. and 650° C. The oxidized layer is next removed by an etchant, and a phosphor layer formed on the crystal grains by vapor-deposit.
Inventors
- 👤 Takashi Noji
- 👤 Yoshiharu Obata
- 👤 Takayoshi Higashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:55
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385; H01J9/00; H01J9/02; H01J9/12; H01J2201/00; H01J2201/34; H01J2201/342; H01J2201/3421; H01J2201/3426
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
51 words
An input screen for an image intensifier tube comprising: a substrate consisting of a plurality of crystal grains of aluminum or aluminum alloy arranged in a plane so that said crystal grains have non-directional shapes in said plane; and a phosphor layer vapor deposited on said crystal grains of said substrate.
Claim 2
Dependent Claim
51 words
An input screen for an image intensifier tube comprising: a substrate consisting of a plurality of crystal grains of aluminum or aluminum alloy arranged in a plane so that said crystal grains have non-directional shapes in said plane; and a phosphor layer vapor deposited on said crystal grains of said substrate.
Claim 3
Dependent Claim
36 words
An input screen for an image intensifier tube according to claim 1, wherein said crystal grain has a mean diameter of several hundred μm to between about ten mm and about sixteen mm in said plane.
Claim 4
Dependent Claim
27 words
An input screen for an image intensifier tube according to claim 1, wherein said phosphor layer includes columnar crystals grown substantially vertically with respect to said plane.
Claim 5
Dependent Claim
24 words
An input screen for an image intensifier tube according to claim 3, wherein said phosphor layer is made of an alkali halide phosphor material.
Claim 6
Dependent Claim
21 words
An input screen for an image intensifier tube according to claim 4, wherein said phosphor layer is made of cesium iodide.
Claim 7
Dependent Claim
49 words
An input screen for an image intensifier tube according to claim 1, wherein said phosphor layer comprises a first and a second phosphor layer, said first phosphor layer including phosphor crystal particles vapor-deposited on said substrate, and said second phosphor layer including columnar crystals grown said phosphor crystal particles.
Claim 8
Independent Claim
62 words
A method of making an input screen for an image intensifier tube comprising the steps: heating a substrate made of aluminum or aluminum alloy in a vacuum or non-oxidizing atmosphere at a temperature of 450° C. to 650° C.; removing an oxidized layer on a surface of said substrate; and vapor-depositing an alkali halide phosphor material on said surface of said substrate.
Claim 9
Independent Claim
62 words
A method of making an input screen for an image intensifier tube comprising the steps: heating a substrate made of aluminum or aluminum alloy in a vacuum or non-oxidizing atmosphere at a temperature of 450° C. to 650° C.; removing an oxidized layer on a surface of said substrate; and vapor-depositing an alkali halide phosphor material on said surface of said substrate.
Claim 10
Dependent Claim
45 words
A method of making an input screen for an image intensifier tube according to claim 7, wherein said vapor-depositing step comprise a step of vapor depositing an alkali halide phosphor material on said surface of said substrate at a low pressure in an non-activated atmosphere.
Claim 11
Dependent Claim
40 words
A method of making an input screen for an image intensifier tube according to claim 7, wherein said vapor-depositing step comprises a step of vapor depositing an alkali halide phosphor material on said surface of said substrate in a vacuum.
Claim 12
Dependent Claim
70 words
A method of making an input screen for an image intensifier tube according to claim 7, wherein said vapor-depositing step comprises a step of first vapor depositing an alkali halide phosphor material on said surface of said substrate at a low pressure in an non-activated atmosphere and a step of vapor depositing an alkali halide material on the phosphor layer formed by said first vapor depositing step in a vacuum.
Claim 13
Dependent Claim
46 words
A method of making an input screen for an image intensifier tube according to claim 7, wherein said removing step comprises a step of etching said surface of said substrate with an etchant for aluminum or aluminum oxide to expose the crystal grains of said substrate.
Claim 14
Dependent Claim
50 words
A method of making an input screen for an image intensifier tube according to claim 7, wherein said vapor-depositing step comprises a step of vapor-depositing an alkali halide phosphor material on said surface of said substrate while the temperature of substrate is being kept at 80° C. to 150° C.
References Cited (Backward Citations)
US3825736A
Cited
FR2229135A2
Cited
FR2351494A1
Cited
US4195230A
Cited
JPS55165553A
Cited
EP0042149A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-11 | 1988-09-10 | 1989-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-11 | 1992-09-10 | 1993-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-11 | 1996-09-10 | 1997-03-12 | $7700.00 | Window Closed / Lapsed |