GB486138A - Improvements in electrodes for high-pressure metal vapour electric discharge devices - Google Patents

Improvements in electrodes for high-pressure metal vapour electric discharge devices

Info

Publication number
GB486138A
GB486138A GB159437A GB159437A GB486138A GB 486138 A GB486138 A GB 486138A GB 159437 A GB159437 A GB 159437A GB 159437 A GB159437 A GB 159437A GB 486138 A GB486138 A GB 486138A
Authority
GB
United Kingdom
Prior art keywords
helix
head
shaft
electrodes
active material
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
Application number
GB159437A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by General Electric Co PLC filed Critical General Electric Co PLC
Priority to GB159437A priority Critical patent/GB486138A/en
Publication of GB486138A publication Critical patent/GB486138A/en
Expired legal-status Critical Current

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

  • Lasers (AREA)
  • Electrolytic Production Of Non-Metals, Compounds, Apparatuses Therefor (AREA)
  • Electrodes For Compound Or Non-Metal Manufacture (AREA)

Abstract

486,138. Metallic-vapour apparatus. GENERAL ELECTRIC CO., Ltd., and FRANCIS, V. J. Jan. 19, 1937, Nos. 1594 and 10027. Drawings to Specification. [Class 39 (i)] A high - pressure metal - vapour discharge device has starting and running electrodes which form together a self-supporting, substantially cylindrical structure, the running electrode being a refractory metal head at one end, and the starting electrode, of thermionically active material supported by a metal, lying behind the head and forming part or the whole of a shaft terminating in and not substantially wider than the head. The shaft may be a straight rod carrying a sleeve, for example a helix, coated with active material; or a helix of refractory metal enclosing a rod consisting of or carrying active material, or an activated helix ; or the shaft may be of porous conductive material saturated with active material, for example a sintered mass of tungsten powder and alkaline earth oxides. The head is preferably of tungsten and may be a sphere or cylinder or a helix wound round the end of the shaft; or the end of the shaft may be wound into a spiral. A non-activated sleeve such as a helix may intervene between the head and the thermionically active portions. Auxiliary ignition electrodes may be provided. The conditions governing the distance between the starting and running electrodes are discussed. Specifications 425,597, 444,545, and 472,658 are referred to.
GB159437A 1937-01-19 1937-01-19 Improvements in electrodes for high-pressure metal vapour electric discharge devices Expired GB486138A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB159437A GB486138A (en) 1937-01-19 1937-01-19 Improvements in electrodes for high-pressure metal vapour electric discharge devices

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB159437A GB486138A (en) 1937-01-19 1937-01-19 Improvements in electrodes for high-pressure metal vapour electric discharge devices

Publications (1)

Publication Number Publication Date
GB486138A true GB486138A (en) 1938-05-31

Family

ID=9724655

Family Applications (1)

Application Number Title Priority Date Filing Date
GB159437A Expired GB486138A (en) 1937-01-19 1937-01-19 Improvements in electrodes for high-pressure metal vapour electric discharge devices

Country Status (1)

Country Link
GB (1) GB486138A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429118A (en) * 1943-03-24 1947-10-14 Ray Lite Electrical Dev Corp Electrode for fluorescent tubes
US2629065A (en) * 1948-05-14 1953-02-17 Westinghouse Electric Corp Overwound filament
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
DE1047313B (en) * 1954-09-22 1958-12-24 Ets Claude Paz & Silva Electrode for gas discharge lamps
EP0456907A2 (en) * 1990-03-15 1991-11-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH High-pressure discharge lamp
US5278474A (en) * 1989-01-12 1994-01-11 Tokyo Densoku Kabushiki Kaisha Discharge tube

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2429118A (en) * 1943-03-24 1947-10-14 Ray Lite Electrical Dev Corp Electrode for fluorescent tubes
US2629065A (en) * 1948-05-14 1953-02-17 Westinghouse Electric Corp Overwound filament
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
DE1047313B (en) * 1954-09-22 1958-12-24 Ets Claude Paz & Silva Electrode for gas discharge lamps
US5278474A (en) * 1989-01-12 1994-01-11 Tokyo Densoku Kabushiki Kaisha Discharge tube
EP0456907A2 (en) * 1990-03-15 1991-11-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH High-pressure discharge lamp
EP0456907A3 (en) * 1990-03-15 1992-03-18 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh High-pressure discharge lamp

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