US2867742A - Dispenser cathode - Google Patents

Dispenser cathode Download PDF

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Publication number
US2867742A
US2867742A US411222A US41122254A US2867742A US 2867742 A US2867742 A US 2867742A US 411222 A US411222 A US 411222A US 41122254 A US41122254 A US 41122254A US 2867742 A US2867742 A US 2867742A
Authority
US
United States
Prior art keywords
cavity
cathode
alkaline
dispenser
supply
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 - Lifetime
Application number
US411222A
Other languages
English (en)
Inventor
Lemmens Hendrikus Johannes
Jansen Marinus Jacobus
Haayman Pieter Willem
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2867742A publication Critical patent/US2867742A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode
    • 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
    • H01J9/042—Manufacture, activation of the emissive part
    • H01J9/047—Cathodes having impregnated bodies

Definitions

  • This invention relates to a dispenser cathode having a cavity which contains a supply of alkaline-earth metal compounds, the wall of the cavity being constituted in part by a porous body of one of the refractory metals tungsten, molybdenum, tantalum, 'hafnium or niobium, which body has been sintered at a high temperature and the pores of which constitute the largest apertures in the wall of the cavity.
  • the invention furthermore relates to a method of manufacturing such a cathode.
  • the supply in a dispenser cathode having a cavity which contains a supply of alkaline-earth metal compounds and of which the wall is constituted n part by a porous body of one of the refractory metals tungsten, molybdenum, ltantalum, hafnium or niobium, which body has been sintered at a high temperature and the pores yof which constitute the largest apertures in the wall of the cavity, the supply consists of a compact mass of alkaline-earth oxide which has been sintered together.
  • the sintered compact mass of alkaline-earth oxide may be obtained by pressing alkaline-earth carbonate and subsequently heating it for some time in a vacuum oven or in an indiierent atmosphere at a high temperature.
  • the heating may be effected either in a Crucible of any suitable metal, for example platinum, or in the cavity of the dispenser cathode itself before being closed by the porous body, which cavity is formed, for example, by
  • reference number 7 indicates a cylindrical molybdenum body having a at flange 8 which is engaged by a porous tungsten body 9, a at ange 10 of a molybdenum cylinder 11 engaging the' other side of the tungsten body.
  • the cavity between the body 9 and the cylindrical body 7 contains a supply of alkaline-earth oxide, indicated by 12, which is obtained by precipitation in a compact form. The precipitation is followed by heating in the same manner as in the case of the pressed carbonate shown in Fig. l. It is alternatively possible for a ymass of alkaline-earth carbonate of the desired shape to be heated in a vacuum oven and provided around the body 7.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Solid Thermionic Cathode (AREA)
  • Microwave Tubes (AREA)
US411222A 1953-02-26 1954-02-18 Dispenser cathode Expired - Lifetime US2867742A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL319758X 1953-02-26

Publications (1)

Publication Number Publication Date
US2867742A true US2867742A (en) 1959-01-06

Family

ID=19783943

Family Applications (1)

Application Number Title Priority Date Filing Date
US411222A Expired - Lifetime US2867742A (en) 1953-02-26 1954-02-18 Dispenser cathode

Country Status (6)

Country Link
US (1) US2867742A (en, 2012)
BE (1) BE526781A (en, 2012)
CH (1) CH319758A (en, 2012)
DE (1) DE1028697B (en, 2012)
FR (1) FR1093864A (en, 2012)
GB (1) GB739645A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965793A (en) * 1959-05-12 1960-12-20 Westinghouse Electric Corp Electron device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1253818B (de) * 1963-05-08 1967-11-09 Hitachi Ltd Gasentladungsroehre

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071973A (en) * 1934-10-12 1937-02-23 Gen Electric Electric gaseous discharge device
US2171238A (en) * 1937-09-02 1939-08-29 Westinghouse Electric & Mfg Co Discharge device and electrode
US2175345A (en) * 1935-07-12 1939-10-10 Gen Electric Electric gaseous discharge device
US2492142A (en) * 1945-10-17 1949-12-27 Kenneth J Germeshausen Electric system embodying coldcathode gaseous discharge device
US2543728A (en) * 1947-11-26 1951-02-27 Hartford Nat Bank & Trust Co Incandescible cathode
US2721372A (en) * 1951-06-30 1955-10-25 Philips Corp Incandescible cathodes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE674258C (de) * 1934-01-27 1939-04-11 Telefunken Gmbh Indirekt geheizte Gluehkathode fuer Kathodenstrahlroehren und Verfahren zu ihrer Herstellung
DE669029C (de) * 1934-06-29 1938-12-15 Siemens Schuckertwerke Akt Ges Selbstaufheizkathode

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2071973A (en) * 1934-10-12 1937-02-23 Gen Electric Electric gaseous discharge device
US2175345A (en) * 1935-07-12 1939-10-10 Gen Electric Electric gaseous discharge device
US2171238A (en) * 1937-09-02 1939-08-29 Westinghouse Electric & Mfg Co Discharge device and electrode
US2492142A (en) * 1945-10-17 1949-12-27 Kenneth J Germeshausen Electric system embodying coldcathode gaseous discharge device
US2543728A (en) * 1947-11-26 1951-02-27 Hartford Nat Bank & Trust Co Incandescible cathode
US2721372A (en) * 1951-06-30 1955-10-25 Philips Corp Incandescible cathodes

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2965793A (en) * 1959-05-12 1960-12-20 Westinghouse Electric Corp Electron device

Also Published As

Publication number Publication date
DE1028697B (de) 1958-04-24
FR1093864A (fr) 1955-05-10
BE526781A (en, 2012)
GB739645A (en) 1955-11-02
CH319758A (de) 1957-02-28

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