GB663787A - Improvements in electric discharge lamps - Google Patents
Improvements in electric discharge lampsInfo
- Publication number
- GB663787A GB663787A GB3313648A GB3313648A GB663787A GB 663787 A GB663787 A GB 663787A GB 3313648 A GB3313648 A GB 3313648A GB 3313648 A GB3313648 A GB 3313648A GB 663787 A GB663787 A GB 663787A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mercury
- gas
- pressure
- discharge
- lamp
- 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
- H01J61/84—Lamps with discharge constricted by high pressure
- H01J61/86—Lamps with discharge constricted by high pressure with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
Landscapes
- Discharge Lamp (AREA)
Abstract
663,787. Discharge lamps. GENERAL ELECTRIC CO., Ltd., and FRANCIS, V. J. Jan. 19, 1950 [Dec. 23, 1948], No. 33136/48. Drawing to Specification. Class 39 (i). A discharge lamp having solid electrodes has a filling of permanent gas, e.g. xenon, at high pressure, exceeding at least 100 mm. of mercury, and a quantity of one or more vaporizable metals such as mercury, cadmium, zinc, tellurium, thallium, indium, gallium or lead, whose ionization potential is less than that of the gas, such that in operation of the lamp under cool conditions the metal vapour pressure is so much less than that of the gas that the light emitted is appreciably due also to the gas. The gas pressure may be 600 mm. of mercury when the cold and the metal vapour pressure 1-10 mm. of mercury in operation, but may rise to 100 mm. when the filling pressure is of the order of 600 mm. if white light due to a mixture of xenon and mercury is required. The vapour pressure may be unsaturated. The cathode consists of a rod of thoriated tungsten. The lamp may dissipate more than 500 watts per cm. of the constricted discharge path. Magnetic deflectors may be used to prevent bowing of the discharge due to convection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3313648A GB663787A (en) | 1948-12-23 | 1948-12-23 | Improvements in electric discharge lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3313648A GB663787A (en) | 1948-12-23 | 1948-12-23 | Improvements in electric discharge lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB663787A true GB663787A (en) | 1951-12-27 |
Family
ID=10349006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3313648A Expired GB663787A (en) | 1948-12-23 | 1948-12-23 | Improvements in electric discharge lamps |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB663787A (en) |
-
1948
- 1948-12-23 GB GB3313648A patent/GB663787A/en not_active Expired
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