GB503112A - Improvements in high-pressure mercury-vapour electric discharge devices - Google Patents
Improvements in high-pressure mercury-vapour electric discharge devicesInfo
- Publication number
- GB503112A GB503112A GB205/38A GB20538A GB503112A GB 503112 A GB503112 A GB 503112A GB 205/38 A GB205/38 A GB 205/38A GB 20538 A GB20538 A GB 20538A GB 503112 A GB503112 A GB 503112A
- Authority
- GB
- United Kingdom
- Prior art keywords
- envelope
- electrode
- mercury
- discharge
- pressure
- 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
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
- H01J61/073—Main electrodes for high-pressure discharge lamps
- H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
Landscapes
- Discharge Lamp (AREA)
Abstract
503,112. Discharge lamps. GENERAL ELECTRIC CO., Ltd. (Patent-Treuhand-Ges. f³r Elektrische Gl³hlampen) Jan. 4, 1938, No. 205. [Class 39 (i)] In a high-pressure mercury-vapour discharge device of the type in which (1) each electrode that acts as a cathode during the discharge is thermionic and heated in operation by the discharge only (2) the inter-electrode distance exceeds the greatest diameter of the envelope at a plane midway between the electrodes and (3) the vapour pressure of the mercury in full operation exceeds 5 atmospheres, each such electrode is in close contact with the end wall of the envelope so that transference of heat between electrode and wall is substantially independent of the presence of liquid mercury, arid the amount of mercury within the envelope is so small that it is all evaporated in full operation. The electrode may be a perforated tungsten canister or closed tungsten helix filled with alkaline earth, mounted in close contact with or sunk into the end wall of the envelope and having a very narrow gap between it and the side walls of the envelope. Alternatively, it may comprise two helices 5, Fig. 3, enclosing the alkaline earth 6 and held in a molybdenum cup 8<1> tightly fitting the end of the envelope. The discharge chamber of the device may be narrower than the part holding the electrode and may be cooled. The electrode chambers may be protected from the cooling medium by a coating or by quartz sleeves 11, Fig. 7. In manufacture the electrodes 3 are first welded to the leads 4 sealed into the quartz rods 9; the discharge chamber 2, which is not less than 5 mm. in internal diameter, is then sealed to the two rods, and the sleeves 11 to shoulders 12 formed on the outside of the envelope. The device is adapted to operate at 80 atmospheres pressure, and may contain other gases besides mercury.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1937P0076473 DE687086C (en) | 1937-12-24 | 1937-12-24 | Overpressure vapor discharge lamp with fixed glow light than 20 atmospheres |
Publications (1)
Publication Number | Publication Date |
---|---|
GB503112A true GB503112A (en) | 1939-03-31 |
Family
ID=29557185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB205/38A Expired GB503112A (en) | 1937-12-24 | 1938-01-04 | Improvements in high-pressure mercury-vapour electric discharge devices |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH206032A (en) |
DE (1) | DE687086C (en) |
FR (1) | FR847408A (en) |
GB (1) | GB503112A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1047312B (en) * | 1953-03-21 | 1958-12-24 | Johann Buser | Discharge-heated sheathed glow electrode for electric gas and vapor discharge lamps, especially for high and high pressure mercury vapor burners |
EP0126503A1 (en) * | 1983-04-22 | 1984-11-28 | Koninklijke Philips Electronics N.V. | High-pressure discharge lamp |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE976223C (en) * | 1949-08-21 | 1963-06-12 | Patra Patent Treuhand | Electric high-pressure gas discharge lamp for direct current operation with fixed glow electrodes |
US2731581A (en) * | 1950-12-18 | 1956-01-17 | Krefft Hermann Eduard | Electrode for gaseous discharge lamps |
-
1937
- 1937-12-24 DE DE1937P0076473 patent/DE687086C/en not_active Expired
-
1938
- 1938-01-04 GB GB205/38A patent/GB503112A/en not_active Expired
- 1938-11-22 CH CH206032D patent/CH206032A/en unknown
- 1938-12-12 FR FR847408D patent/FR847408A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1047312B (en) * | 1953-03-21 | 1958-12-24 | Johann Buser | Discharge-heated sheathed glow electrode for electric gas and vapor discharge lamps, especially for high and high pressure mercury vapor burners |
EP0126503A1 (en) * | 1983-04-22 | 1984-11-28 | Koninklijke Philips Electronics N.V. | High-pressure discharge lamp |
Also Published As
Publication number | Publication date |
---|---|
CH206032A (en) | 1939-07-15 |
FR847408A (en) | 1939-10-10 |
DE687086C (en) | 1940-01-22 |
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