US4023039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent screen and image-converter tubes utilizing such a screen
Assignee: Thales SA
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Filing: 1975-01-23
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Granted: 1977-05-10
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Expires: 1995-01-23
Abstract
Abstract In order to avoid losses in definition and contrast which are observed in image-converter tubes as a consequence of the light scatter taking place within the body of the scintillators of the input screens of these tubes, when said scintillators occur in the form of a continuous layer of material, the present invention provides for the formation within a layer of microscopic channels which are transversely disposed, the channels being formed by covering the substrate, prior to the deposition of the scintillator thereon, with a layer of a granular material, preferably glass balls. Application to radiology and scintillography.
Inventors
- 👤 Jean Pierre Galves
- 👤 Jean Sagnard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:33
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J29/385; G; G01; G01T; G01T1/00; G01T1/16; G01T1/161; G01T1/164; G01T1/1641; G01T1/1645
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
64 words
A luminescent screen comprising a layer of luminescent material applied to a substrate characterized in that between said layer and said substrate there is arranged a layer of a granular material which consists of a single layer of glass balls (4) separate from each other by interstices (5) whereby islands of luminescent material separated by microscopic channels (6) are formed in the luminescent layer.
Claim 2
Dependent Claim
64 words
A luminescent screen comprising a layer of luminescent material applied to a substrate characterized in that between said layer and said substrate there is arranged a layer of a granular material which consists of a single layer of glass balls (4) separate from each other by interstices (5) whereby islands of luminescent material separated by microscopic channels (6) are formed in the luminescent layer.
Claim 3
Dependent Claim
21 words
A luminescent screen as claimed in claim 1, characterized in that said balls have a diameter ranging between 20 and 70/um.
Claim 4
Dependent Claim
18 words
A luminescent screen as claimed in claim 1, characterized in that said luminescent material is an alkaline halide.
Claim 5
Dependent Claim
18 words
A luminescent screen as claimed in claim 3, characterized in that said luminescent material is cesium iodide, CsI.
Claim 6
Dependent Claim
49 words
A screen according to claim 1 for an X-ray image converter tube, further comprising within a evacuted envelope an output screen, and said luminescent screen being provided with a layer of photosensitive material characterized in that said layer of photosensitive material is deposited upon said layer of luminescent material.
Claim 7
Dependent Claim
50 words
An image-converter tube for radioscopic images, comprising an input screen subjected to the incident X-ray radiation and an output screen opposite the former upon which output screen there is formed a visible image of said radiation, characterized in that said input screen is a screen as claimed in claim 5.
References Cited (Backward Citations)
CA503260A
Cited
US2495697A
Cited
US2650310A
Cited
US3041456A
Cited
US3253146A
Cited
US3330981A
Cited
US3435222A
Cited
US3829700A
Cited
US3838273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |