GB643642A - Improvements relating to electric discharge lamps - Google Patents
Improvements relating to electric discharge lampsInfo
- Publication number
- GB643642A GB643642A GB1257345A GB1257345A GB643642A GB 643642 A GB643642 A GB 643642A GB 1257345 A GB1257345 A GB 1257345A GB 1257345 A GB1257345 A GB 1257345A GB 643642 A GB643642 A GB 643642A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- strip
- metal
- designed
- autotransformer
- 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
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/16—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies
- H05B41/20—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch
- H05B41/22—Circuit arrangements in which the lamp is fed by dc or by low-frequency ac, e.g. by 50 cycles/sec ac, or with network frequencies having no starting switch for lamps having an auxiliary starting electrode
Landscapes
- Discharge Lamps And Accessories Thereof (AREA)
Abstract
643,642. Metal-vapour lamps. BRITISH THOMSON-HOUSTON CO., Ltd., and RUFF, H. R. May 18, 1945, No. 12573. [Class 39 (i)] In a low pressure fluorescent discharge lamp 1 with a filling of argon and mercury vapour starting is facilitated by a strip 4 of conducting material extending along the envelope and terminating near the electrodes 2 and 3, and in addition these electrodes are so designed than an ionizing discharge occurs across their ends during the starting period. The conducting path is earthed and may consist of a strip of metal or of metal particles sprayed on to a roughened strip on the glass or sprayed through a mask on to the surface of the envelope previously heated above 300‹ C. The electrodes are coiled-coil tungsten filament with emissive coating and may be provided in known manner with auxiliary electrodes. The circuit comprises a stabilizing choke 7 in one of the leads to the primary winding of an autotransformer 6 from source 5, with secondary windings 8 and 9 to supply preheating current to the electrodes. In another arrangement the autotransformer provides from its secondary winding a voltage higher than that applied to the primary and in a third the transformer is so designed to dispense with the choke. Specification 537,901 is referred to. Reference has been directed by the Comptroller to Specification 592,246.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1257345A GB643642A (en) | 1945-05-18 | 1945-05-18 | Improvements relating to electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1257345A GB643642A (en) | 1945-05-18 | 1945-05-18 | Improvements relating to electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB643642A true GB643642A (en) | 1950-09-27 |
Family
ID=10007144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1257345A Expired GB643642A (en) | 1945-05-18 | 1945-05-18 | Improvements relating to electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB643642A (en) |
-
1945
- 1945-05-18 GB GB1257345A patent/GB643642A/en not_active Expired
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