US4937503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent light source based on a phosphor excited by a molecular discharge
Assignee: Osram Sylvania Inc
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Filing: 1988-04-11
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Granted: 1990-06-26
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Expires: 2008-04-11
Abstract
Abstract A fluorescent light source based on a phosphor excited by a molecular discharge is described. The fluorescent light source comprises a capacitively coupled compact fluorescent lamp coated with a manganese doped magnesium aluminate phosphor on the inside surface of the lamp envelope. The compact fluorscent lamp produces a plasma which emits 206 nm radiation from the molecular discharge of the iodine containing molecular vapors and inert gas fill which in turn excites the phosphor to emit visible light.
Inventors
- 👤 A. Gary Sigai
- 👤 Walter P. Lapatovich
- 👤 Michael N. Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:55
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/641; C09K11/643; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44; H01J65/00; H01J65/04; H01J65/042; H01J65/046; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
128 words
A fluorescent light source comprising a compact fluorescent lamp having a lamp envelope made of a light transmitting substance, said envelope including an outer surface, an inner surface with a manganese doped magnesium aluminate phosphor coating thereon which emits visible light upon absorption of ultraviolet radiation of about 206 nm and at least one re-entrant cavity and enclosing a fill material which forms a plasma during discharge, said plasma emits ultraviolet radiation of about 206 nm and has an effective electrical impedance; an outer conductor disposed around the outer surface of said envelope; an inner conductor disposed in said re-entrant cavity; and a high frequency power source coupled to said inner and outer conductors for inducing an electric field in said compact fluorescent lamp and causing discharge therein.
Claim 2
Dependent Claim
128 words
A fluorescent light source comprising a compact fluorescent lamp having a lamp envelope made of a light transmitting substance, said envelope including an outer surface, an inner surface with a manganese doped magnesium aluminate phosphor coating thereon which emits visible light upon absorption of ultraviolet radiation of about 206 nm and at least one re-entrant cavity and enclosing a fill material which forms a plasma during discharge, said plasma emits ultraviolet radiation of about 206 nm and has an effective electrical impedance; an outer conductor disposed around the outer surface of said envelope; an inner conductor disposed in said re-entrant cavity; and a high frequency power source coupled to said inner and outer conductors for inducing an electric field in said compact fluorescent lamp and causing discharge therein.
Claim 3
Dependent Claim
23 words
A fluorescent light source in accordance with claim 1 wherein said manganese doped magnesium aluminate phosphor has an approximate formula MgAl.sub.2 O.sub.4 :Mn
Claim 4
Dependent Claim
19 words
A fluorescent light source in accordance with claim 2 wherein said approximate formula is (Mg.sub.1-x Mn.sub.x)Al.sub.2 O.sub.4 wherein 0.005≦x≦0.05
Claim 5
Dependent Claim
16 words
A fluorescent light source in accordance with claim 1 wherein said light transmitting substance comprises glass.
Claim 6
Dependent Claim
36 words
A fluorescent light source in accordance with claim 1 wherein said fill material comprises an iodine containing molecular vapor and an inert gas selected from the group consisting of neon, argon, krypton, xenon, or mixtures thereof.
Claim 7
Dependent Claim
34 words
A fluorescent light source in accordance with claim 5 wherein said iodine containing molecular vapor is selected from the group consisting of molecular vapors of I 2 , HgI 2 , and mixtures thereof.
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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) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |