GB962651A - Electrodes for high-pressure electric discharge lamps and process of manufacturing the same - Google Patents

Electrodes for high-pressure electric discharge lamps and process of manufacturing the same

Info

Publication number
GB962651A
GB962651A GB21357/60A GB2135760A GB962651A GB 962651 A GB962651 A GB 962651A GB 21357/60 A GB21357/60 A GB 21357/60A GB 2135760 A GB2135760 A GB 2135760A GB 962651 A GB962651 A GB 962651A
Authority
GB
United Kingdom
Prior art keywords
rod
tungsten
crystals
thorium oxide
mixture
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
GB21357/60A
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of GB962651A publication Critical patent/GB962651A/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
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode

Landscapes

  • Discharge Lamp (AREA)

Abstract

962,651. Electrode materials and processing. PATENT - TREUHAND - GES. FUR ELEKTRISCHE GLUHLAMPEN m.b.H. June 17, 1960 [July 8, 1959], No. 21357/60. Drawings to Specification. Heading H1. A cathode for a high-pressure discharge lamp is composed of a solid rod having a tapered tip portion and consisting of tungsten and a small addition, about 5% by weight, of thorium oxide, the rod comprising interlocking tungsten crystals elongated longitudinally throughout the rod, the length of the crystals being at least several mms. and the width of the crystals being at least several tenths of mms., and a plurality of thorium oxide particles minute compared with the tungsten crystals distributed uniformly throughout the whole volume of the rod and enclosed tightly within the tungsten crystals. The cathode is inserted into a body of sintered tungsten. The electrode can be manufactured by pressing a mixture of tungsten powder and a small amount of thorium oxide powder to slug form, sintering the slug to provide a coherent body, swaging the body to rod form to form elongated fine crystals, dividing the rod into portions, tapering one end of each rod portion and annealing the rod portions in a reducing atmosphere of hydrogennitrogen at 2800‹ C. up to complete re-crystallization and formation of coarse crystals. After the annealing step the rod portions can be swaged and annealed again. The mixture of tungsten and thorium oxide can be made by adding a thorium compound in dissolved form to tungstic acid and subjecting the mixture to a high temperature in a current of dry hydrogen. The electrode can be used in a lamp having an ellipsoidal or drop-shaped envelope filled with xenon.
GB21357/60A 1959-07-08 1960-06-17 Electrodes for high-pressure electric discharge lamps and process of manufacturing the same Expired GB962651A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP23114A DE1088155B (en) 1959-07-08 1959-07-08 Electrode for electric high pressure discharge lamps

Publications (1)

Publication Number Publication Date
GB962651A true GB962651A (en) 1964-07-01

Family

ID=7369052

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21357/60A Expired GB962651A (en) 1959-07-08 1960-06-17 Electrodes for high-pressure electric discharge lamps and process of manufacturing the same

Country Status (5)

Country Link
US (1) US3054014A (en)
DE (1) DE1088155B (en)
FR (1) FR1262280A (en)
GB (1) GB962651A (en)
NL (2) NL253509A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789255A (en) * 1972-01-12 1974-01-29 Westinghouse Electric Corp Non-sag incandescent tungsten filament for an incandescent lamp
DE102004043247B4 (en) * 2004-09-07 2010-04-15 Osram Gesellschaft mit beschränkter Haftung Electrode for high-pressure discharge lamps and high-pressure discharge lamp with such electrodes

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3328623A (en) * 1964-03-02 1967-06-27 Sylvania Electric Prod Surge arrestor having electrodes containing a low resistivity metal
NL7406379A (en) * 1974-05-13 1975-11-17 Philips Nv HIGH PRESSURE DISCHARGE LAMP.
NL185478C (en) * 1980-09-05 1990-04-17 Philips Nv HIGH PRESSURE SODIUM VAPOR DISCHARGE LAMP.
DE3240359A1 (en) * 1982-11-02 1984-05-03 W.C. Heraeus Gmbh, 6450 Hanau "ELECTRODE FOR LASER EXCITATION LAMPS"
DE3723271A1 (en) * 1987-07-14 1989-01-26 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh CATHODE FOR A HIGH PRESSURE DISCHARGE LAMP
DE9415217U1 (en) 1994-09-21 1996-01-25 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH, 81543 München High pressure discharge lamp
JP5247718B2 (en) * 2006-12-18 2013-07-24 オスラム ゲーエムベーハー Discharge lamp electrode
JP5670708B2 (en) * 2010-11-19 2015-02-18 株式会社ユメックス Electrode for short arc discharge lamp and method for manufacturing the same
JP5024466B1 (en) * 2011-03-10 2012-09-12 ウシオ電機株式会社 Short arc type discharge lamp
CN107785230B (en) * 2017-11-02 2024-06-04 常州玉宇电光器件有限公司 High-trigger cathode and manufacturing process thereof

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1569095A (en) * 1926-01-12 laise
US1082933A (en) * 1912-06-19 1913-12-30 Gen Electric Tungsten and method of making the same for use as filaments of incandescent electric lamps and for other purposes.
US1461118A (en) * 1917-12-19 1923-07-10 Westinghouse Lamp Co Filament
US1723862A (en) * 1920-05-07 1929-08-06 Gen Electric Process for the manufacture of drawn tungsten wires
GB569651A (en) * 1939-01-27 1945-06-04 Siemens Electric Lamps & Suppl Improvements in or relating to electric discharge lamps
GB573141A (en) * 1940-11-12 1945-11-08 Siemens Electric Lamps & Suppl Improvements relating to electric discharge lamps
US2716713A (en) * 1950-03-22 1955-08-30 Gen Electric Cold electrode pulse lamp structure

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3789255A (en) * 1972-01-12 1974-01-29 Westinghouse Electric Corp Non-sag incandescent tungsten filament for an incandescent lamp
DE102004043247B4 (en) * 2004-09-07 2010-04-15 Osram Gesellschaft mit beschränkter Haftung Electrode for high-pressure discharge lamps and high-pressure discharge lamp with such electrodes

Also Published As

Publication number Publication date
FR1262280A (en) 1961-05-26
NL253509A (en)
US3054014A (en) 1962-09-11
NL109963C (en)
DE1088155B (en) 1960-09-01

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