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Patent US3783298A successfully refreshed from Google Patents.
US3783298A
Expired / Lapsed
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X-ray image intensifier input phosphor screen and method of manufacture thereof
Assignee: General Electric Co
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Filing: 1972-05-17
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Granted: 1974-01-01
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Expires: 1992-05-17
Abstract
Abstract The surface of a waffle-like silicone resin and granular phosphor mixture substrate forms an array of cells for the support for the input transparent phosphor screen of an x-ray image intensifier tube. The solid projecting silicone resingranular phosphor walls substantially reduce degradation of image resolution and contrast due to lateral scattering of light in the transparent phosphor and thereby permits use of a thicker phosphor screen for higher x-ray absorption, and, or higher image resolution. The method of fabricating the phosphor screen includes the intermediate step of forming a rubber replica of a metal master of the waffle surface. The rubber replica is coated with the granular phosphor-silicone resin mixture and a vacuum is drawn between the rubber replica and face plate of the x-ray image intensifier tube for causing adhesion therebetween.
Inventors
- 👤 J Houston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:44
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: 21
Claim 1
Independent Claim
41 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein the first side of said substrate member having floor portions interconnecting the wall-like projections to define the waffle-like surface, the floor portions being parallel to the second side.
Claim 2
Dependent Claim
30 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the substrate member floor portions are of uniform thickness in the range of 1 to 3 mils.
Claim 3
Dependent Claim
32 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the wall-like projections of the substrate member are of thickness in the range of approximately 1 to 1.5 mils.
Claim 4
Dependent Claim
44 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein the inner surface of said face plate is connected to the second side of said substrate member by means of adherence with the silicone resin thereof for bonding the adjoining surfaces.
Claim 5
Dependent Claim
20 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein said face plate is fabricated of aluminum.
Claim 6
Dependent Claim
20 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein said face plate is fabricated of glass.
Claim 7
Dependent Claim
24 words
The x-ray image intensifier input phosphor screen set forth in claim 1 whereIn said face plate is fabricated of a low atomic number metal.
Claim 8
Dependent Claim
19 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein said phosphor layer comprising cesium iodide.
Claim 9
Dependent Claim
21 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein said phosphor layer comprises a transparent phosphor material.
Claim 10
Dependent Claim
44 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein the granular phosphor of said silicone resin-granular phosphor substrate member is of small grain size of particle diameter less than 0.1 mil to obtain increased light scattering and light reflection characteristics.
Claim 11
Dependent Claim
28 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the floor portions on the first side of said substrate member each being square shaped.
Claim 12
Dependent Claim
35 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the floor portions on the first side of said substrate member form equal size squares separated by equal size said wall-like projections.
Claim 13
Dependent Claim
28 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the floor portions on the first side of said substrate member each being hexagon shaped.
Claim 14
Dependent Claim
35 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the floor portions on the first side of said substrate member form equal size hexagons separated by equal size said wall-like projections.
Claim 15
Dependent Claim
37 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein the wall-like projections of said substrate member extending normal to the inner surface of said face plate and outward in a direction away therefrom.
Claim 16
Dependent Claim
22 words
The x-ray image intensifier input phosphor screen set forth in claim 16 wherein the wall-like projections each extend outward approximately 10 mils.
Claim 17
Dependent Claim
27 words
The x-ray image intensifier input phosphor screen set forth in claim 16 wherein the wall-like projections each have a thickness dimension of approximately 1 to 1.5 mils.
Claim 18
Dependent Claim
35 words
The x-ray image intensifier input phosphor screen set forth in claim 2 wherein the floor portions on the first side of said substrate member each have a width dimension of approximately 4 to 6 mils.
Claim 19
Dependent Claim
29 words
The x-ray image intensifier input phosphor screen set forth in claim 15 wherein the hexagon shaped floor portions each having a width dimension of approximately 4 to 6 mils.
Claim 20
Dependent Claim
29 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein the wall-like projections of said substrate member extend into the phosphor layer at least halfway therethrough.
Claim 21
Dependent Claim
51 words
The x-ray image intensifier input phosphor screen set forth in claim 1 wherein the wall-like projections of said substrate member extending through approximately 80 percent of the phosphor layer, and having a relatively high light reflectivity for directing the light photons generated in the phosphor layer toward the photoelectron producing means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |