US4803366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input screen scintillator for a radiological image intensifier tube and a method of manufacturing such a scintillator
Assignee: Individual
•
Filing: 1986-08-19
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Granted: 1989-02-07
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Expires: 2006-08-19
Abstract
Abstract The present invention provides an input screen scintillator for a radiological image intensifier tube in which the cesium iodide needles of the scintillator are coated with a refractory, transparent of reflecting, material having an optical index close to or less than that of the cesium iodide. Different methods may be used for coating, such as chemical vapor phase deposition, activated by thermal excitation, plasma excitation or photonic excitation; or such as diffusion deposition of a colloidal solution; or such as polymerization of a polymer resin. After coating, is realized the heat treatment which ensures the luminescence of the screen.
Inventors
- 👤 Gerard Vieux
- 👤 Henri Rougeot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:34
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
74 words
An input screen scintillator for a radiological image intensifier tube comprising a layer of juxtaposed cesium iodide needles having lateral sides extending transversally to said layer, said layer including gaps between the needles, wherein said needles are coated with a refractory material on their lateral sides within the gaps, and wherein said refractory material is transparent and has an optical refractive index approximately the same or less than that of said cesium iodide needles.
Claim 2
Dependent Claim
74 words
An input screen scintillator for a radiological image intensifier tube comprising a layer of juxtaposed cesium iodide needles having lateral sides extending transversally to said layer, said layer including gaps between the needles, wherein said needles are coated with a refractory material on their lateral sides within the gaps, and wherein said refractory material is transparent and has an optical refractive index approximately the same or less than that of said cesium iodide needles.
Claim 3
Independent Claim
91 words
A method of manufacturing an input screen scintillator for a radiological image intensifier tube, comprising the steps of: forming a layer of juxtaposed cesium iodide needles having lateral sides extending transversally to said layer, said layer having gaps between the needles; coating the lateral sides of the needles within the gaps with a transparent refractory material; wherein said refractory material has an optical refractive index approximately the same or less than that of said cesium iodide needles and thereafter heat treating said input screen in order to insure the luminescence thereof.
Claim 4
Independent Claim
91 words
A method of manufacturing an input screen scintillator for a radiological image intensifier tube, comprising the steps of: forming a layer of juxtaposed cesium iodide needles having lateral sides extending transversally to said layer, said layer having gaps between the needles; coating the lateral sides of the needles within the gaps with a transparent refractory material; wherein said refractory material has an optical refractive index approximately the same or less than that of said cesium iodide needles and thereafter heat treating said input screen in order to insure the luminescence thereof.
Claim 5
Dependent Claim
26 words
The method of claim 2, wherein said transparent refractory material has an optical index approximately the same or less than that of the cesium iodide needles.
Claim 6
Dependent Claim
26 words
An input screen scintillator according to claim 1, wherein the material for coating the needles is an oxide of a metal or of a non metal.
Claim 7
Dependent Claim
47 words
An input screen scintillator according to claim 1, wherein the coating material is selected from the group consisting of SiO, SiO 2 , SiO x with 1<x<2, Al 2 O 3 , Sb 2 O 5 , Si 3 N 4 , S n O 4 .
Claim 8
Dependent Claim
22 words
The method of claim 2, wherein the step of coating the needles includes depositing said coating material by chemical vapor phase deposition.
Claim 9
Dependent Claim
43 words
The method of claim 2, wherein the step of coating the needles includes depositing said coating material by chemical vapor phase deposition, activated by thermal excitation, one of the following coating materials being used : SiO 2 , Si 3 N 4 .
Claim 10
Dependent Claim
40 words
The method of claim 2, wherein the step of coating needles includes depositing said coating material by chemical vapor phase deposition, activated by one of the following techniques : plasma excitation, photonic excitation, use of low pressure and high temperature.
Claim 11
Dependent Claim
38 words
The method of claim 2, wherein the step of coating the needles includes depositing said coating material by diffusion of a colloidal solution inside the gaps between needles, followed by heat treatment causing deposition of the coating material.
Claim 12
Dependent Claim
33 words
The method of claim 9, wherein said colloidal solution is selected from the group consisting of Si O 2 , Al 2 O 3 , Sb 2 O 5 , SnO 4 .
Claim 13
Dependent Claim
42 words
The method of claim 2, wherein the step of coating the needles includes having said cesium iodide needles coated in a vacuum with a polymer resin of the silicon type or any other polyimide material, and subsequent hardening of the coating material.
Claim 14
Dependent Claim
40 words
The method of claim 2, wherein the step of coating the needles includes having said cesium iodide needles coated by diffusion, between the needles, of an organo-metallic compound then undergoing one of the following treatments: high temperature, treatment air hydrolysis.
Claim 15
Dependent Claim
20 words
The method of claim 12, wherein said organo-metallic compound is selected from the group consisting of tetramethoxy-silane, tetra-ethoxy-silane, silicon tetra-acetate.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |