GB937938A - Improvements in sodium vapour electric discharge lamps - Google Patents
Improvements in sodium vapour electric discharge lampsInfo
- Publication number
- GB937938A GB937938A GB800660A GB800660A GB937938A GB 937938 A GB937938 A GB 937938A GB 800660 A GB800660 A GB 800660A GB 800660 A GB800660 A GB 800660A GB 937938 A GB937938 A GB 937938A
- Authority
- GB
- United Kingdom
- Prior art keywords
- container
- electric discharge
- electrodes
- metal
- sodium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/82—Lamps with high-pressure unconstricted discharge having a cold pressure > 400 Torr
- H01J61/825—High-pressure sodium lamps
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/045—Thermic screens or reflectors
Abstract
937,938. Metal vapour lamps. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Feb. 24, 1961 [March 7, 1960], No. 8006/60. Class 39 (1). A sodium vapour electric discharge lamp comprises an arc tube 8 of light permeable vitreous or ceramic material of high alumina content sealed at its ends by metallic or ceramic discs 9, 10 supporting electrodes 2, 3 having a coating of electron emissive material and being connected to leads 6, 7 which pass through the stem 5 of an outer heat insulating container 4. The arc traverses an atmosphere containing sodium at a partial pressure of between 5 and 500 mm. of mercury and a rare gas, e.g. neon, at a pressure sufficient to support an initial discharge between the electrodes, and the outer container 4 may be evacuated or formed as a double walled Dewar flask. A thermally insulating glass wall 12 and a thin reflective film of metal, e.g. gold, on the inside of container 4, may be provided to assist in maintaining the operating temperature within the range 500-800‹ C.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB800660A GB937938A (en) | 1960-03-07 | 1960-03-07 | Improvements in sodium vapour electric discharge lamps |
| BE600971A BE600971A (en) | 1960-03-07 | 1961-03-06 | Improvements to electric sodium vapor discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB800660A GB937938A (en) | 1960-03-07 | 1960-03-07 | Improvements in sodium vapour electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB937938A true GB937938A (en) | 1963-09-25 |
Family
ID=9843975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB800660A Expired GB937938A (en) | 1960-03-07 | 1960-03-07 | Improvements in sodium vapour electric discharge lamps |
Country Status (2)
| Country | Link |
|---|---|
| BE (1) | BE600971A (en) |
| GB (1) | GB937938A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4890030A (en) * | 1984-06-18 | 1989-12-26 | Gte Products Corporation | Metal halide discharge lamp with arc tube temperature equalizing means |
-
1960
- 1960-03-07 GB GB800660A patent/GB937938A/en not_active Expired
-
1961
- 1961-03-06 BE BE600971A patent/BE600971A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4890030A (en) * | 1984-06-18 | 1989-12-26 | Gte Products Corporation | Metal halide discharge lamp with arc tube temperature equalizing means |
Also Published As
| Publication number | Publication date |
|---|---|
| BE600971A (en) | 1961-09-06 |
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