GB1294383A - Discharge lamps having improved thermionic cathodes - Google Patents

Discharge lamps having improved thermionic cathodes

Info

Publication number
GB1294383A
GB1294383A GB6662/70A GB666270A GB1294383A GB 1294383 A GB1294383 A GB 1294383A GB 6662/70 A GB6662/70 A GB 6662/70A GB 666270 A GB666270 A GB 666270A GB 1294383 A GB1294383 A GB 1294383A
Authority
GB
United Kingdom
Prior art keywords
metal
stem
refractory metal
cup
tubular member
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
GB6662/70A
Inventor
Maurice George Clarke
Norman Burgess
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.)
Thorn Lighting Ltd
Original Assignee
Thorn Lighting Ltd
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 Thorn Lighting Ltd filed Critical Thorn Lighting Ltd
Priority to GB6662/70A priority Critical patent/GB1294383A/en
Priority to US113934A priority patent/US3700951A/en
Priority to CA105,098A priority patent/CA941876A/en
Publication of GB1294383A publication Critical patent/GB1294383A/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
    • H01J61/0737—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode characterised by the electron emissive material

Landscapes

  • Discharge Lamp (AREA)

Abstract

1294383 Cathode materials THORN LIGHTING Ltd 19 April 1971 [11 Feb 1970] 6662/70 Heading H1D [Also in Division C7] A discharge lamp includes a thermionic cathode comprising a refractory metal stem 10, a refractory metal tubular member 11 secured to one end of the stem to form a cup 13 and an electron emitter composition including a refractory metal, a lanthanide metal or Th and a further metal which is at least partly soluble in the lanthanide metal or Th and whose alloy therewith is capable of wetting the refractory metal in the cup. The refractory metal is W, Ta or Mo. The further metal is Ti, V, Cr, Mn, Hf, Fe, Co, Ni, Zr, Ru, Rh, Pd, Os, Ir, Pt or another lanthanide metal. The composition may comprise 90% W, 9À5% Th and 0À5% Zr which is compressed and vacuum fired above 1200‹ C. The tubular member is of sheet or foil clamped to the stem of wire 15. The stem and tubular member are of W, Ta or Mo. A coating of powdered composition may be applied to the inside of the cup by coating the sheet before assembly. The cathode is used in h.p. Na and Hg lamps and reduces envelope blackening.
GB6662/70A 1970-02-11 1970-02-11 Discharge lamps having improved thermionic cathodes Expired GB1294383A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB6662/70A GB1294383A (en) 1970-02-11 1970-02-11 Discharge lamps having improved thermionic cathodes
US113934A US3700951A (en) 1970-02-11 1971-02-09 Discharge lamps having improved thermionic cathodes
CA105,098A CA941876A (en) 1970-02-11 1971-02-11 Discharge lamps having improved thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB6662/70A GB1294383A (en) 1970-02-11 1970-02-11 Discharge lamps having improved thermionic cathodes

Publications (1)

Publication Number Publication Date
GB1294383A true GB1294383A (en) 1972-10-25

Family

ID=9818525

Family Applications (1)

Application Number Title Priority Date Filing Date
GB6662/70A Expired GB1294383A (en) 1970-02-11 1970-02-11 Discharge lamps having improved thermionic cathodes

Country Status (3)

Country Link
US (1) US3700951A (en)
CA (1) CA941876A (en)
GB (1) GB1294383A (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3916241A (en) * 1972-06-14 1975-10-28 Gte Sylvania Inc High pressure electric discharge lamp and electrode therefor
US3988629A (en) * 1974-10-07 1976-10-26 General Electric Company Thermionic wick electrode for discharge lamps
GB8303074D0 (en) * 1983-02-04 1983-03-09 Gen Electric Co Plc Electric discharge lamps
US4806826A (en) * 1986-12-16 1989-02-21 Gte Products Corporation High pressure sodium vapor discharge device
DE4026301A1 (en) * 1990-08-20 1992-02-27 Siemens Ag ELECTRON EMITTER OF A X-RAY TUBE
BE1007595A3 (en) * 1993-10-07 1995-08-16 Philips Electronics Nv HIGH-metal halide discharge LAMP.
CN104183460A (en) * 2013-05-28 2014-12-03 海洋王照明科技股份有限公司 Ceramic halogen lamp electrode and ceramic halogen lamp
CN104183457A (en) * 2013-05-28 2014-12-03 海洋王照明科技股份有限公司 Ceramic halogen lamp electrode

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1953625A (en) * 1930-04-04 1934-04-03 Gen Scientific Corp Electrode for luminous positive column gaseous conducting devices
US2175345A (en) * 1935-07-12 1939-10-10 Gen Electric Electric gaseous discharge device
US2900554A (en) * 1951-06-01 1959-08-18 Rca Corp Sleeve for indirectly heated cathode
GB1137124A (en) * 1964-12-23 1968-12-18 Nat Res Dev Thermionic electron emitter
US3548242A (en) * 1967-05-16 1970-12-15 Sylvania Electric Prod High pressure electric discharge device and cathode

Also Published As

Publication number Publication date
US3700951A (en) 1972-10-24
CA941876A (en) 1974-02-12

Similar Documents

Publication Publication Date Title
GB1294383A (en) Discharge lamps having improved thermionic cathodes
GB1366525A (en) Discharge lamp
GB1240778A (en) High pressure compact arc lamp
GB568962A (en) Improvements in or relating to cathodes for electron discharge devices
GB648955A (en) Improvements in electron-emitting electrodes for electric discharge tubes
GB1439045A (en) Cermaic discharge lamps
ES206484A1 (en) Cathode containing a supply of an electron-emissive material
GB1378138A (en) Thermionic cathode for an electric discharge tube
GB1191463A (en) Improvements relating to Low-Pressure Mercury Vapour Discharge Lamps
GB740456A (en) Activating material for electrodes in electric discharge devices
GB899164A (en) Improvements in or relating to brazing or the like
JPS5943063U (en) high intensity discharge lamp
GB739232A (en) Improvements in or relating to dispenser cathodes
GB791495A (en) Improvements in or relating to cathodes of the dispenser type
GB624013A (en) Improvements in electric discharge tubes
US2183841A (en) Multiple getter
GB644409A (en) Improvements in electric discharge lamps
GB1016067A (en) Electrode structures for electron tubes
GB1470318A (en) Cathode for electronic tube
GB705537A (en) Improvements in or relating to a method of manufacturing cathodes for use in electric discharge tubes and to cathodes manufactured by this method
GB216840A (en)
GB1174033A (en) Improvements in or relating to Thermionic Discharge Tubes
GB717034A (en) Improvements in or relating to the manufacture of porous metal bodies
GB277997A (en)
GB790899A (en) Improvements in or relating to supply cathodes

Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee