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US5811924A
Expired / Lapsed
US
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Fluorescent lamp
Assignee: Toshiba Corp
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Filing: 1996-09-18
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Granted: 1998-09-22
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Expires: 2016-09-18
Abstract
Abstract A phosphor film structure comprising a substrate and a phosphor film formed on the substrate, wherein the phosphor film comprises ultrafine phosphor particles having an average diameter of 200 nm or less, and obtained by heating a phosphor material to vaporize and rapidly quenching to solidify, and a haze of the phosphor film to a luminous flux of 380-760 nm in wavelength is 50% or less.
Inventors
- 👤 Miwa Okumura
- 👤 Naotoshi Matsuda
- 👤 Keiko Albessard
- 👤 Masaaki Tamatani
- 👤 Fusayoshi Kido
- 👤 Iwao Mitsuishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:48
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/48
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
118 words
A fluorescent lamp, comprising: a glass tube in which an ionizable medium containing mercury is sealed; an undercoat layer formed on an inner surface of said glass tube, said layer comprising ultrafine phosphor particles having an average diameter of 200 nm or less and which are obtained by heating a phosphor material, which vaporizes the material, and rapidly quenching the material to solidify the phosphor material; a luminous layer comprising spherical phosphor particles having an average diameter of at least one 1 μm, which are prepared by a thermal plasma treatment; and electrodes provided on both ends of the glass tube; wherein the hase value of the transmitted visible light from the lamp is no more than 50%.
Claim 2
Dependent Claim
118 words
A fluorescent lamp, comprising: a glass tube in which an ionizable medium containing mercury is sealed; an undercoat layer formed on an inner surface of said glass tube, said layer comprising ultrafine phosphor particles having an average diameter of 200 nm or less and which are obtained by heating a phosphor material, which vaporizes the material, and rapidly quenching the material to solidify the phosphor material; a luminous layer comprising spherical phosphor particles having an average diameter of at least one 1 μm, which are prepared by a thermal plasma treatment; and electrodes provided on both ends of the glass tube; wherein the hase value of the transmitted visible light from the lamp is no more than 50%.
Claim 3
Dependent Claim
20 words
The fluorescent lamp according to claim 1, wherein the undercoat layer has a thickness ranging 100 nm to 100 μm.
Claim 4
Dependent Claim
14 words
The fluorescent lamp according to claim 2, wherein said thickness ranges from 1-3 μm.
Claim 5
Dependent Claim
21 words
The fluorescent lamp according to claim 1, wherein said ultrafine phosphor particles have an average diameter of 150 nm or less.
Claim 6
Dependent Claim
20 words
The fluorescent lamp according to claim 4, wherein the ultrafine phosphor particles have an average diameter ranging from 10-50 nm.
Claim 7
Dependent Claim
27 words
The fluorescent lamp according to claim 1, wherein the ultrafine phosphor particles of the undercoat layer are present in an amount ranging from 5-500 μg/cm 2 .
Claim 8
Dependent Claim
20 words
The fluorescent lamp according to claim 6, wherein said amount of ultrafine phosphor particles ranges from 5-50 μg/cm 2 .
Claim 9
Dependent Claim
26 words
The fluorescent lamp according to claim 1, wherein the phosphor particles of said luminous layer are spherical particles having an average diameter ranging from 1-10 μm.
Claim 10
Dependent Claim
15 words
The fluorescent lamp according to claim 8, wherein said average diameter ranges from 1-10 μm.
Claim 11
Dependent Claim
22 words
The fluorescent lamp according to claim 1, wherein an ultraviolet suppressing layer is positioned between said undercoat layer and said luminous layer.
Claim 12
Dependent Claim
18 words
The fluorescent lamp according to claim 10, wherein said luminous layer has a thickness ranging from 0.1-100 μm.
Claim 13
Dependent Claim
18 words
The fluorescent lamp according to claim 11, wherein said suppressing layer has a thickness ranging from 0.5-30 μm.
Claim 14
Dependent Claim
24 words
The fluorescent lamp according to claim 1, wherein the number of ultrafine particles having an average diameter of 300 nm is less than 5%.
Claim 15
Dependent Claim
24 words
The fluorescent lamp according to claim 1, wherein said ultrafine phosphor particles have at least one common composition as those constituting said luminous layer.
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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) | 2001-09-21 | 2002-03-23 | 2002-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-21 | 2006-03-23 | 2006-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-21 | 2010-03-23 | 2010-09-22 | $7700.00 | Window Closed / Lapsed |