GB281262A - Improvements in or relating to electron emitting cathodes - Google Patents

Improvements in or relating to electron emitting cathodes

Info

Publication number
GB281262A
GB281262A GB30197/27A GB3019727A GB281262A GB 281262 A GB281262 A GB 281262A GB 30197/27 A GB30197/27 A GB 30197/27A GB 3019727 A GB3019727 A GB 3019727A GB 281262 A GB281262 A GB 281262A
Authority
GB
United Kingdom
Prior art keywords
sheath
wire
core
electron
centre
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
GB30197/27A
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.)
Radiotechnique SA
Original Assignee
Radiotechnique SA
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 Radiotechnique SA filed Critical Radiotechnique SA
Publication of GB281262A publication Critical patent/GB281262A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microwave Tubes (AREA)
  • Electron Sources, Ion Sources (AREA)

Abstract

281,262. Radiotechnique. Nov. 26, 1926, [Convention date]. Drawings to Specification. Vacuum tubes.-A thermionic cathode consists of a core of tungsten or other refractory metal with an adherent sheath of insulating material such as magnesia, baryta, strontia, or lime. which is applied by heating the wire in the material, an electron-emitting metal or compound such as thoriated tungsten being mounted on the sheath, for example in the form of a helical wire with close or open turns disposed along the length or at the centre of the sheath, or of a ring at the centre. The electron-emitting wire may be connected with the core wire or with a separate lead. The melting point of the sheath is lower than that of the core, and higher tLan the temperature at which electrons are emitted by the helix or ring.
GB30197/27A 1926-11-26 1927-11-10 Improvements in or relating to electron emitting cathodes Expired GB281262A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR547289X 1926-11-26

Publications (1)

Publication Number Publication Date
GB281262A true GB281262A (en) 1928-11-08

Family

ID=8934115

Family Applications (1)

Application Number Title Priority Date Filing Date
GB30197/27A Expired GB281262A (en) 1926-11-26 1927-11-10 Improvements in or relating to electron emitting cathodes

Country Status (3)

Country Link
DE (1) DE547289C (en)
FR (1) FR637962A (en)
GB (1) GB281262A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760248C (en) * 1933-11-08 1953-10-19 Georg Seibt Nachf Dr Indirectly heated cathode for cathode ray tubes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE738936C (en) * 1931-08-20 1944-04-19 Aeg Incandescent cathode, especially for X-ray tubes, Braun tubes
DE883782C (en) * 1938-06-24 1953-07-20 Westinghouse Electric Corp High pressure electric discharge device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE760248C (en) * 1933-11-08 1953-10-19 Georg Seibt Nachf Dr Indirectly heated cathode for cathode ray tubes

Also Published As

Publication number Publication date
DE547289C (en) 1932-03-22
FR637962A (en) 1928-05-12

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