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GB1378138A - Thermionic cathode for an electric discharge tube - Google Patents

Thermionic cathode for an electric discharge tube

Info

Publication number
GB1378138A
GB1378138A GB2515573A GB2515573A GB1378138A GB 1378138 A GB1378138 A GB 1378138A GB 2515573 A GB2515573 A GB 2515573A GB 2515573 A GB2515573 A GB 2515573A GB 1378138 A GB1378138 A GB 1378138A
Authority
GB
United Kingdom
Prior art keywords
cathode
electric discharge
discharge tube
thermionic cathode
plate
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
GB2515573A
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 GB1378138A publication Critical patent/GB1378138A/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
    • H01J1/15—Cathodes heated directly by an electric current
    • 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
    • H01J1/148—Solid thermionic cathodes characterised by the material with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

1378138 Cathode materials PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 25 May 1973 [30 May 1972] 25155/73 Heading H1D A thermionic cathode comprises a Mo plate 5 welded to a W filament 4 and carrying a compressed mixture 6 of LaB 6 and Rh, W 2 B or W 2 B 5 . The plate is circular or polygonal, plane or concave. It may be formed from Mo powder and compressed with the mixture at 3000 kg./ cm.<SP>2</SP>. The cathode is heated in H 2 at 1750‹ C., degassed at 1600‹ C. and activated at 1500‹ C. One or more zig-zag or spiral W filaments may be used, connected to Fe-Ni-Co alloy leads 2, 3. The cathode is used in electron microscopes.
GB2515573A 1972-05-30 1973-05-25 Thermionic cathode for an electric discharge tube Expired GB1378138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7207276A NL7207276A (en) 1972-05-30 1972-05-30

Publications (1)

Publication Number Publication Date
GB1378138A true GB1378138A (en) 1974-12-18

Family

ID=19816154

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2515573A Expired GB1378138A (en) 1972-05-30 1973-05-25 Thermionic cathode for an electric discharge tube

Country Status (9)

Country Link
US (1) US3823337A (en)
JP (1) JPS555660B2 (en)
CA (1) CA990777A (en)
CH (1) CH554071A (en)
DE (1) DE2325274C3 (en)
FR (1) FR2186722B1 (en)
GB (1) GB1378138A (en)
NL (1) NL7207276A (en)
SE (1) SE382885B (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019081A (en) * 1974-10-25 1977-04-19 Bbc Brown Boveri & Company Limited Reaction cathode
JPS607335B2 (en) * 1974-11-29 1985-02-23 カナデイアン、パテンツ、アンド、デイベラツプメント、リミテツド thermionic emission cathode
US4055780A (en) * 1975-04-10 1977-10-25 National Institute For Researches In Inorganic Materials Thermionic emission cathode having a tip of a single crystal of lanthanum hexaboride
US4009409A (en) * 1975-09-02 1977-02-22 Gte Sylvania Incorporated Fast warmup cathode and method of making same
US4054946A (en) * 1976-09-28 1977-10-18 Bell Telephone Laboratories, Incorporated Electron source of a single crystal of lanthanum hexaboride emitting surface of (110) crystal plane
US4137476A (en) * 1977-05-18 1979-01-30 Denki Kagaku Kogyo Kabushiki Kaisha Thermionic cathode
US4168565A (en) * 1977-05-18 1979-09-25 Denki Kagaku Kogyo Kabushiki Kaisha Method for manufacturing thermionic cathode
US4258283A (en) * 1978-08-31 1981-03-24 Balzers Aktiengesellschaft Fur Hochvakuumtechnik Und Dunne Schichten Cathode for electron emission
FR2445605A1 (en) * 1978-12-27 1980-07-25 Thomson Csf DIRECT HEATING CATHODE AND HIGH FREQUENCY ELECTRONIC TUBE COMPRISING SUCH A CATHODE
JPS57196443A (en) * 1981-05-29 1982-12-02 Denki Kagaku Kogyo Kk Manufacture of hot cathode
EP0637046B1 (en) * 1993-07-29 1998-04-01 Nec Corporation Thermoionic emissive cathode method of fabricating the same thermoionic emissive cathode and electron beam apparatus
JP2010157490A (en) * 2008-12-02 2010-07-15 Canon Inc Electron emitting element and display panel using the electron emitting element

Also Published As

Publication number Publication date
NL7207276A (en) 1973-12-04
CA990777A (en) 1976-06-08
FR2186722B1 (en) 1976-09-17
DE2325274C3 (en) 1981-07-09
JPS555660B2 (en) 1980-02-08
US3823337A (en) 1974-07-09
DE2325274A1 (en) 1973-12-13
DE2325274B2 (en) 1980-10-23
CH554071A (en) 1974-09-13
SE382885B (en) 1976-02-16
FR2186722A1 (en) 1974-01-11
JPS4944662A (en) 1974-04-26

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Legal Events

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