GB810202A - Improvements relating to thermionic cathodes for electron discharge devices - Google Patents

Improvements relating to thermionic cathodes for electron discharge devices

Info

Publication number
GB810202A
GB810202A GB1679655A GB1679655A GB810202A GB 810202 A GB810202 A GB 810202A GB 1679655 A GB1679655 A GB 1679655A GB 1679655 A GB1679655 A GB 1679655A GB 810202 A GB810202 A GB 810202A
Authority
GB
United Kingdom
Prior art keywords
cathode
magnesium
heater
june
converted
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
GB1679655A
Inventor
John Heywood Ludlow
Peter Henry Dawson
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical Co 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB1679655A priority Critical patent/GB810202A/en
Priority to DEM30748A priority patent/DE1113269B/en
Priority to FR1151321D priority patent/FR1151321A/en
Publication of GB810202A publication Critical patent/GB810202A/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)
  • Solid Thermionic Cathode (AREA)
  • Electron Sources, Ion Sources (AREA)
  • Microwave Tubes (AREA)

Abstract

810,202. Indirectly heated cathode. METROPOLITAN - VICKERS ELECTRICAL CO. Ltd. June 5, 1956 [June 10, 1955], No. 16796/55. Class 39(3) [Also in Group XL(a)] In manufacturing a thermionic cathode, the heater is first placed inside a hollow member of readily oxidizable metal such as magnesium or aluminium, this member then laid in a groove or duct in the cathode and the metal converted into oxide by chemical and/or thermal reaction. The cathode shown has a dished emissive surface 2, and a number of concentric circular grooves. The heater wire 3 is placed within two semi-circular channel members 14, 15 of magnesium, and the grooves then closed by a cover plate 13. The magnesium is converted into magnesium oxide by passing steam through the assembly, so that the heater is now embedded in sulating material. The cathode may alternatively be in the form of a hollow cylinder, with the heater passing through longitu dinal ducts (Fig. 5, not shown).
GB1679655A 1955-06-10 1955-06-10 Improvements relating to thermionic cathodes for electron discharge devices Expired GB810202A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1679655A GB810202A (en) 1955-06-10 1955-06-10 Improvements relating to thermionic cathodes for electron discharge devices
DEM30748A DE1113269B (en) 1955-06-10 1956-06-09 Process for the production of an indirectly heated cathode for electrical discharge tubes
FR1151321D FR1151321A (en) 1955-06-10 1956-06-09 Improvements made to thermionic cathodes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1679655A GB810202A (en) 1955-06-10 1955-06-10 Improvements relating to thermionic cathodes for electron discharge devices

Publications (1)

Publication Number Publication Date
GB810202A true GB810202A (en) 1959-03-11

Family

ID=10083824

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1679655A Expired GB810202A (en) 1955-06-10 1955-06-10 Improvements relating to thermionic cathodes for electron discharge devices

Country Status (3)

Country Link
DE (1) DE1113269B (en)
FR (1) FR1151321A (en)
GB (1) GB810202A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3195003A (en) * 1962-11-16 1965-07-13 Westinghouse Electric Corp Electron discharge device

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL28875C (en) * 1930-01-22
CH172489A (en) * 1932-10-21 1934-10-15 Loewe Opta Gmbh Braun tube, in particular for television purposes, and method for producing the same.
DE704280C (en) * 1934-03-27 1941-03-27 Telefunken Gmbh Heating element for glow cathodes
NL46481C (en) * 1935-06-09
NL59655C (en) * 1941-08-08
BE475720A (en) * 1946-08-30
NL246331A (en) * 1951-07-11
DE890390C (en) * 1951-07-12 1953-09-17 Siemens Ag Cathode for electrical discharge vessels
DE905517C (en) * 1951-12-06 1954-03-04 Siemens Ag Cathode for electrical discharge vessels

Also Published As

Publication number Publication date
DE1113269B (en) 1961-08-31
FR1151321A (en) 1958-01-29

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