Patent US4972120A successfully refreshed from Google Patents.
US4972120A
Expired / Lapsed
US
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High efficacy electrodeless high intensity discharge lamp
Assignee: General Electric Co
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Filing: 1989-05-08
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Granted: 1990-11-20
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Expires: 2009-05-08
Abstract
Abstract Improved efficacy and color rendition are achieved in a high intensity discharge, solenoidal electric field (HID-SEF) lamp by using a novel combination of fill ingredients, including lanthanum halide, sodium halide, cerium halide, and xenon or krypton as a buffer gas. The preferred lamp structure is that of a short cylinder having rounded edges in order to achieve isothermal lamp operation and further efficacy improvement.
Inventors
- 👤 Harald L. Witting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:19
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/12; H01J61/16; H01J65/00; H01J65/04; H01J65/042
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
123 words
An electrodeless metal halide high intensity discharge lamp, comprising: a light transmissive arc tube for containing an arc discharge; a fill disposed in said arc tube, said fill including lanthanum halide, sodium halide and cerium halide, said halides being selected from the group consisting of iodides, chlorides and bromides, including mixtures thereof, said halides being combined in weight proportions to generate white color lamp emission exhibiting improved efficacy and color rendition; said fill further including a buffer gas selected from the group consisting of xenon and krypton, said buffer gas being present in sufficient quantity to limit chemical transport of energy from said arc discharge to the walls of said arc tube; and excitation means for coupling radio frequency energy to said fill.
Claim 2
Dependent Claim
123 words
An electrodeless metal halide high intensity discharge lamp, comprising: a light transmissive arc tube for containing an arc discharge; a fill disposed in said arc tube, said fill including lanthanum halide, sodium halide and cerium halide, said halides being selected from the group consisting of iodides, chlorides and bromides, including mixtures thereof, said halides being combined in weight proportions to generate white color lamp emission exhibiting improved efficacy and color rendition; said fill further including a buffer gas selected from the group consisting of xenon and krypton, said buffer gas being present in sufficient quantity to limit chemical transport of energy from said arc discharge to the walls of said arc tube; and excitation means for coupling radio frequency energy to said fill.
Claim 3
Dependent Claim
12 words
The lamp of claim 1 wherein said lanthanum halide comprises lanthanum iodide.
Claim 4
Dependent Claim
17 words
The lamp of claim 2 wherein said cerium halide and said sodium halide each comprise an iodide.
Claim 5
Dependent Claim
17 words
The lamp of claim 1 wherein said cerium halide and said sodium halide each comprise an iodide.
Claim 6
Dependent Claim
11 words
The lamp of claim 1 wherein said buffer gas comprises xenon.
Claim 7
Dependent Claim
33 words
The lamp of claim 5 wherein the quantity of xenon is sufficient to provide a partial pressure in the range of approximately 250 Torr and higher at the operating temperature of the lamp.
Claim 8
Dependent Claim
11 words
The lamp of claim 1 wherein said buffer gas comprises krypton.
Claim 9
Dependent Claim
33 words
The lamp of claim 7 wherein the quantity of krypton is sufficient to provide a partial pressure in the range of approximately 250 Torr and higher at the operating temperature of the lamp.
Claim 10
Dependent Claim
11 words
The lamp of claim 2 wherein said buffer gas comprises xenon.
Claim 11
Dependent Claim
33 words
The lamp of claim 9 wherein the quantity of xenon is sufficient to provide a partial pressure in the range of approximately 250 Torr and higher at the operating temperature of the lamp.
Claim 12
Dependent Claim
11 words
The lamp of claim 2 wherein said buffer gas comprises krypton.
Claim 13
Dependent Claim
33 words
The lamp of claim 11 wherein the quantity of krypton is sufficient to provide a partial pressure in the range of approximately 250 Torr and higher at the operating temperature of the lamp.
Claim 14
Dependent Claim
26 words
The lamp of claim 1 wherein said arc tube is substantially cylindrically shaped with the height of said arc tube being less than its outside diameter.
Claim 15
Dependent Claim
26 words
The lamp of claim 2 wherein said arc tube is substantially cylindrically shaped with the height of said arc tube being less than its outside diameter.
Claim 16
Dependent Claim
26 words
The lamp of claim 3 wherein said arc tube is substantially cylindrically shaped with the height of said arc tube being less than its outside diameter.
Claim 17
Dependent Claim
107 words
In an electrodeless metal halide high intensity discharge lamp having an arc tube for containing an arc discharge, an arc tube fill substantially free of mercury comprising: lanthanum halide, sodium halide and cerium halide, said halides being selected from the group consisting of iodides, chlorides and bromides, including mixtures thereof, said halides being combined in weight proportions to generate white color lamp emission exhibiting improved efficacy and color rendition; and a buffer gas selected from the group consisting of xenon and krypton, said buffer gas being present in sufficient quantity to limit chemical transport of energy from said arc discharge to the walls of said arc tube.
Claim 18
Dependent Claim
107 words
In an electrodeless metal halide high intensity discharge lamp having an arc tube for containing an arc discharge, an arc tube fill substantially free of mercury comprising: lanthanum halide, sodium halide and cerium halide, said halides being selected from the group consisting of iodides, chlorides and bromides, including mixtures thereof, said halides being combined in weight proportions to generate white color lamp emission exhibiting improved efficacy and color rendition; and a buffer gas selected from the group consisting of xenon and krypton, said buffer gas being present in sufficient quantity to limit chemical transport of energy from said arc discharge to the walls of said arc tube.
Claim 19
Dependent Claim
12 words
The lamp of claim 16 wherein said lanthanum halide comprises lanthanum iodide.
Claim 20
Dependent Claim
17 words
The lamp of claim 17 wherein said cerium halide and said sodium halide each comprise an iodide.
Claim 21
Dependent Claim
11 words
The lamp of claim 16 wherein said buffer gas comprises xenon.
Claim 22
Dependent Claim
11 words
The lamp of claim 16 wherein said buffer gas comprises krypton.
Claim 23
Dependent Claim
11 words
The lamp of claim 17 wherein said buffer gas comprises xenon.
Claim 24
Dependent Claim
11 words
The lamp of claim 17 wherein said buffer gas comprises krypton.
References Cited (Backward Citations)
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
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