US4713577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-layer faceted luminescent screens
Assignee: Honeywell International Inc
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Filing: 1985-12-20
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Granted: 1987-12-15
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Expires: 2005-12-20
Abstract
Abstract A multi-layer luminescent screen includes a luminescent crystalline sublayer and a faceted overlayer. The faceted overlayer causes the emission from the screen of a greater fraction of the luminescence than would otherwise be the case. The screens, which are typically cathodoluminescent, find application in computer displays, lithography, and flying spot scanners.
Inventors
- 👤 Devlin M. Gualtieri
- 👤 Shui T. Lai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:00
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/26; C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7767; C09K11/7769; C09K11/7774; C09K11/7783; C09K11/7784; C09K11/7787; H01J29/24
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
107 words
A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has: (a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and (b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and (c) said sublayer comprising Gd 3 Ga 5 O 12 :M and said overlayer comprising Gd 3 Ga 5-b (S c , In) b O 12 where b is in the range between 0 and about 2 and where M is at least one luminescent ion.
Claim 2
Dependent Claim
107 words
A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has: (a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and (b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and (c) said sublayer comprising Gd 3 Ga 5 O 12 :M and said overlayer comprising Gd 3 Ga 5-b (S c , In) b O 12 where b is in the range between 0 and about 2 and where M is at least one luminescent ion.
Claim 3
Dependent Claim
26 words
The screen of claim 1 in which M is one or more ion of an element selected from the group consisting of Ce, Tb, and Eu.
Claim 4
Dependent Claim
11 words
The screen of claim 2 in which M includes Ce ion.
Claim 5
Dependent Claim
15 words
The screen of claim 1 in which the orientation of the sublayer surface is (111).
Claim 6
Dependent Claim
23 words
The screen of claim 1 in which the lattice constant of the overlayer exceeds that of the sublayer by less than about 2%.
Claim 7
Dependent Claim
15 words
The screen of claim 1 in which the overlayer is less than one micrometer thick.
Claim 8
Dependent Claim
11 words
The screen of claim 1 in which the overlayer is luminescent.
Claim 9
Dependent Claim
12 words
The screen of claim 1 further comprising a support for the sublayer.
Claim 10
Dependent Claim
23 words
The screen of claim 8 in which the support comprises an undoped crystal and the sublayer comprises the same crystal and a dopant.
Claim 11
Dependent Claim
14 words
The screen of claim 1 further comprising a reflective coating on the faceted layer.
Claim 12
Dependent Claim
108 words
A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has: (a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and (b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and (c) said sublayer comprising Gd 3 Ga 5 O 12 :M and the overlayer comprising Gd 3 G 5-b (Sc,In) b O 12 :M" in which M and M" are each at least one luminescent ion, and b is in the range between 0 and about 2.
Claim 13
Dependent Claim
108 words
A luminescent screen having at least two layers and comprising a luminescent crystalline sublayer that has a surface on which is a crystalline overlayer that has: (a) the same crystal structure as the sublayer, with the sublayer being a single crystal; and (b) a lattice constant that sufficiently exceeds the lattice constant of the sublayer that the overlayer is faceted; and (c) said sublayer comprising Gd 3 Ga 5 O 12 :M and the overlayer comprising Gd 3 G 5-b (Sc,In) b O 12 :M" in which M and M" are each at least one luminescent ion, and b is in the range between 0 and about 2.
Claim 14
Dependent Claim
26 words
The screen of claim 11 in which M is one or more ions of an element selected from the group consisting of Ce, Tb, and Eu.
Claim 15
Dependent Claim
11 words
The screen of claim 12 in which M includes Ce ion.
Claim 16
Dependent Claim
15 words
The screen of claim 11 in which the orientation of the sublayer surface is (111).
Claim 17
Dependent Claim
23 words
The screen of claim 11 in which the lattice constant of the overlayer exceeds that of the sublayer by less than about 2%.
Claim 18
Dependent Claim
15 words
The screen of claim 11 in which the overlayer is less than one micrometer thick.
Claim 19
Dependent Claim
11 words
The screen of claim 11 in which the overlayer is luminescent.
Claim 20
Dependent Claim
12 words
The screen of claim 11 further comprising a support for the sublayer.
Claim 21
Dependent Claim
23 words
The screen of claim 18 in which the support comprises an undoped crystal and the sublayer comprises the same crystal and a dopant.
Claim 22
Dependent Claim
14 words
The screen of claim 11 further comprising a reflective coating on the faceted layer.
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) | 1990-12-14 | 1991-06-15 | 1991-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-14 | 1995-06-15 | 1995-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-14 | 1999-06-15 | 1999-12-15 | $7700.00 | Window Closed / Lapsed |