US4540915A
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Fluorescent lamp and phosphor coating composition used therefor
Assignee: Hitachi Ltd
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Filing: 1982-04-29
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Granted: 1985-09-10
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Expires: 2002-04-29
Abstract
Abstract A fluorescent lamp having a phosphor layer composed of a glass material represented by the general formula: xLn2O3.yMO.wM'.vM2''O.zB2O3 (wherein Ln is at least one element selected from the group consisting of Y and lanthanum series elements, M is at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn, M' is at least one oxide selected from the group consisting of Al2O3, SiO2 and Sb2O3, M'' is at least one element selected from the group consisting of Li, Na and K, and x, y, z, w and v are the numerical values defined by 1</=x</=30, 0</=y</=60, 0</=w</=20, 0<v</=15 and 30</=z</=80 in molar percent, respectively, but y+w is a value defined by 0</=y+w</=60 in molar percent), and a phosphor. Said glass material is insoluble in water and can be worked into a water-soluble slurry with said phosphor and other component materials for forming a phosphor layer.
Inventors
- 👤 Kouki Shinkai
- 👤 Naoki Hagiwara
- 👤 Masaki Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:41
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/12; C03C3/00; C03C3/04; C03C3/062; C03C3/064; C03C3/068; C03C3/12; C03C3/14; C03C3/15
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
177 words
A fluorescent lamp having a phosphor layer formed on the inner wall of the glass tube of the lamp, said phosphor layer being composed of a glass material represented by the general formula: xLn 2 O 3 .yMO.wM'.vM 2 "O.zB 2 O 3 (wherein Ln is at least one element selected from the group consisting of Y and lanthanum series elements, M is at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn, M' is at least one oxide selected from the group consisting of Al 2 O 3 , SiO 2 and Sb 2 O 3 , M" is at least one element selected from the group consisting of Li, Na and K, and x, y, z, w and v are the numerical values defined by 1≦x≦30, 0≦y≦60, 0≦w≦20, 0<v≦15 and 30≦z≦80 in molar percent, respectively, but y+w is a value defined by 0≦y+w≦60 in molar percent) and a phosphor blended in an amount of 10 to 1000 parts by weight to one part by weight of said glass material.
Claim 2
Dependent Claim
177 words
A fluorescent lamp having a phosphor layer formed on the inner wall of the glass tube of the lamp, said phosphor layer being composed of a glass material represented by the general formula: xLn 2 O 3 .yMO.wM'.vM 2 "O.zB 2 O 3 (wherein Ln is at least one element selected from the group consisting of Y and lanthanum series elements, M is at least one element selected from the group consisting of Mg, Ca, Sr, Ba and Zn, M' is at least one oxide selected from the group consisting of Al 2 O 3 , SiO 2 and Sb 2 O 3 , M" is at least one element selected from the group consisting of Li, Na and K, and x, y, z, w and v are the numerical values defined by 1≦x≦30, 0≦y≦60, 0≦w≦20, 0<v≦15 and 30≦z≦80 in molar percent, respectively, but y+w is a value defined by 0≦y+w≦60 in molar percent) and a phosphor blended in an amount of 10 to 1000 parts by weight to one part by weight of said glass material.
Claim 3
Dependent Claim
33 words
The fluorescent lamp according to claim 1, wherein the amount of said phosphor is within the range of 15 to 200 parts by weight to one part by weight of said glass material.
Claim 4
Dependent Claim
23 words
The fluorescent lamp according to claim 1, wherein x in the general formula is a numerical value defined by 1≦x≦20 in molar percent.
Claim 5
Dependent Claim
17 words
The fluorescent lamp according to claim 1 or 3, wherein Ln in the general formula is La.
Claim 6
Dependent Claim
17 words
The fluorescent lamp according to claim 1 or 3, wherein Ln in the general formula is Y.
Claim 7
Dependent Claim
17 words
The fluorescent lamp according to claim 1 or 3, wherein Ln in the general formula is Gd.
Claim 8
Dependent Claim
23 words
The fluorescent lamp according to claim 1, where y in the general formula is a numerical value defined by 0≦y≦50 in molar percent.
Claim 9
Dependent Claim
30 words
The fluorescent lamp according to claim 1 or 7, wherein M in the general formula is at least one element selected from the group consisting of Zn, Mg and Ca.
Claim 10
Dependent Claim
23 words
The fluorescent lamp according to claim 1, wherein z in the general formula is a numerical value defined by 40≦z≦70 in molar percent.
Claim 11
Dependent Claim
23 words
The fluorescent lamp according to claim 1, wherein v in the general formula is a numerical value defined by 1≦v≦15 in molar percent.
Claim 12
Dependent Claim
11 words
The fluorescent lamp according to claim 1, wherein Ln represents lanthanum.
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) | 1988-09-09 | 1989-03-11 | 1989-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-09 | 1993-03-11 | 1993-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-09 | 1997-03-11 | 1997-09-10 | $7700.00 | Window Closed / Lapsed |