GB994151A - Improvements in or relating to electric discharge tubes - Google Patents

Improvements in or relating to electric discharge tubes

Info

Publication number
GB994151A
GB994151A GB8435/62A GB843562A GB994151A GB 994151 A GB994151 A GB 994151A GB 8435/62 A GB8435/62 A GB 8435/62A GB 843562 A GB843562 A GB 843562A GB 994151 A GB994151 A GB 994151A
Authority
GB
United Kingdom
Prior art keywords
layer
barium
alkaline earth
earth metal
cathode
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
GB8435/62A
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.)
Philips Electronics UK Ltd
Original Assignee
Philips Electronic and Associated Industries 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 Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB994151A publication Critical patent/GB994151A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • H01J1/142—Solid thermionic cathodes characterised by the material with alkaline-earth metal oxides, or such oxides used in conjunction with reducing agents, as an emissive material
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/13—Solid thermionic cathodes
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

994,151. Cathode materials. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. March 5, 1962 [March 8, 1961], No. 8435/62. Heading H1D. A cathode for a thermionic valve or other electric discharge tube comprises a metal cathode body 2 carrying outermost an emissive barium-activated alkaline earth metal oxide 4, and interposed therebetween, a substratum layer 3 of oxidic alkaline earth metal compounds containing barium and, in addition, a reducing agent which releases barium from the oxidic compounds in the operation of the valve. The emissive layer 4 preferably consists of strontium oxide or a mixed oxide of barium and strontium, the substratum layer 3 of a double or triple alkaline earth metal oxide with titanium hydride (e.g. 3% by weight) as a reducing agent and the cathode body 2 of electrolytic nickel or cobalt. In manufacture, the two layers are sprayed on until layer 3 is 60Á thick and layer 4 is 20Á thick. Specification 929,002 is referred to.
GB8435/62A 1961-03-08 1962-03-05 Improvements in or relating to electric discharge tubes Expired GB994151A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL262150 1961-03-08

Publications (1)

Publication Number Publication Date
GB994151A true GB994151A (en) 1965-06-02

Family

ID=19752920

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8435/62A Expired GB994151A (en) 1961-03-08 1962-03-05 Improvements in or relating to electric discharge tubes

Country Status (9)

Country Link
US (1) US3333141A (en)
CH (1) CH412118A (en)
DE (1) DE1149463B (en)
DK (1) DK106684C (en)
ES (1) ES275203A1 (en)
GB (1) GB994151A (en)
NL (1) NL113461C (en)
OA (1) OA00735A (en)
SE (1) SE306579B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308495A (en) * 1995-12-20 1997-06-25 Lg Electronics Inc Cathodes

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6501944A (en) * 1965-02-17 1966-08-18
US3663857A (en) * 1969-02-13 1972-05-16 Avco Corp Electron emitter comprising metal oxide-metal contact interface and method for making the same
US3898721A (en) * 1973-05-18 1975-08-12 Gte Sylvania Inc Diffusion bonded cathode for electron discharge device
US3875629A (en) * 1973-05-18 1975-04-08 Gte Sylvania Inc Method of fabricating cathodes for electron discharge devices
DE3323473A1 (en) * 1983-06-29 1985-01-03 Siemens AG, 1000 Berlin und 8000 München QUICK HEATING CATHODE
DE102008041443A1 (en) 2008-08-22 2010-02-25 Robert Bosch Gmbh Gear drive unit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950993A (en) * 1956-04-02 1960-08-30 Rca Corp Oxide coated cathodes and method of manufacture
US3159461A (en) * 1958-10-20 1964-12-01 Bell Telephone Labor Inc Thermionic cathode
US2945150A (en) * 1958-12-11 1960-07-12 Gen Electric Thermionic cathodes and methods of making
US2995674A (en) * 1959-02-27 1961-08-08 Raytheon Co Impregnated cathodes
NL255625A (en) * 1959-09-18

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2308495A (en) * 1995-12-20 1997-06-25 Lg Electronics Inc Cathodes
GB2308495B (en) * 1995-12-20 2000-08-30 Lg Electronics Inc A Cathode structure body and a method of coating an emitter

Also Published As

Publication number Publication date
ES275203A1 (en) 1962-05-01
NL113461C (en)
US3333141A (en) 1967-07-25
OA00735A (en) 1967-07-15
CH412118A (en) 1966-04-30
DK106684C (en) 1967-03-06
SE306579B (en) 1968-12-02
DE1149463B (en) 1963-05-30

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