GB182817A - Improvements in the cathodes of electric discharge tubes - Google Patents

Improvements in the cathodes of electric discharge tubes

Info

Publication number
GB182817A
GB182817A GB18917/22A GB1891722A GB182817A GB 182817 A GB182817 A GB 182817A GB 18917/22 A GB18917/22 A GB 18917/22A GB 1891722 A GB1891722 A GB 1891722A GB 182817 A GB182817 A GB 182817A
Authority
GB
United Kingdom
Prior art keywords
metal
compounds
cathodes
earth
group
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
GB18917/22A
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.)
Telefunken AG
Original Assignee
Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
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 Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH filed Critical Telefunken Gesellschaft fuer Drahtlose Telegraphie mbH
Publication of GB182817A publication Critical patent/GB182817A/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

Landscapes

  • Glass Compositions (AREA)
  • Discharge Lamp (AREA)

Abstract

182,817. Ges f³r Drahtlose Telegraphie. July 11, 1921, [Convention date]. Vacuum tubes.-An incandescent cathode comprises oxides or other compounds of a metal of the alkaline-earth group and also of a metal of the rare-earth group, or of yttrium. Compounds of more than one metal of each group may be present; for instance, oxides of calcium, strontium, barium, lanthanum, and yttrium may be used in conjunction. Preferably onlv small proportions of the rare-earth compounds are employed. An iridium or platinum wire may form the core.
GB18917/22A 1921-07-11 1922-07-10 Improvements in the cathodes of electric discharge tubes Expired GB182817A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE182817X 1921-07-11

Publications (1)

Publication Number Publication Date
GB182817A true GB182817A (en) 1923-08-09

Family

ID=5718287

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18917/22A Expired GB182817A (en) 1921-07-11 1922-07-10 Improvements in the cathodes of electric discharge tubes

Country Status (1)

Country Link
GB (1) GB182817A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473358A (en) * 1946-08-23 1949-06-14 Raytheon Mfg Co Cathode coating for electron discharge devices
DE1021482B (en) * 1952-04-24 1957-12-27 Egyesuelt Izzolampa Process for the production of an oxide cathode for low-pressure discharge lamps and other gas-filled electrical discharge tubes
DE2344936A1 (en) * 1973-07-09 1975-02-06 Bbc Brown Boveri & Cie THERMAL CATHODE FOR ELECTRON TUBES AND METHOD OF MANUFACTURING THEREOF
EP0639848A1 (en) * 1993-08-20 1995-02-22 Samsung Display Devices Co., Ltd. Oxide cathode for electron tube
EP0641006A1 (en) * 1993-08-24 1995-03-01 Samsung Display Devices Co., Ltd. Cathode for an electron tube
WO1997005639A1 (en) * 1995-07-31 1997-02-13 Casio Computer Co., Ltd. Electron-emitting electrode, method of manufacturing the same, and light-emitting device having the same
EP0764963A1 (en) * 1995-09-21 1997-03-26 Matsushita Electronics Corporation Emitter material for cathode ray tube and a method for manufacturing the same
EP0794548A1 (en) * 1996-03-05 1997-09-10 Thomson-Csf Thermionic cathode and manufacturing method
US5925976A (en) * 1996-11-12 1999-07-20 Matsushita Electronics Corporation Cathode for electron tube having specific emissive material

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473358A (en) * 1946-08-23 1949-06-14 Raytheon Mfg Co Cathode coating for electron discharge devices
DE1021482B (en) * 1952-04-24 1957-12-27 Egyesuelt Izzolampa Process for the production of an oxide cathode for low-pressure discharge lamps and other gas-filled electrical discharge tubes
DE2344936A1 (en) * 1973-07-09 1975-02-06 Bbc Brown Boveri & Cie THERMAL CATHODE FOR ELECTRON TUBES AND METHOD OF MANUFACTURING THEREOF
EP0639848A1 (en) * 1993-08-20 1995-02-22 Samsung Display Devices Co., Ltd. Oxide cathode for electron tube
EP0641006A1 (en) * 1993-08-24 1995-03-01 Samsung Display Devices Co., Ltd. Cathode for an electron tube
WO1997005639A1 (en) * 1995-07-31 1997-02-13 Casio Computer Co., Ltd. Electron-emitting electrode, method of manufacturing the same, and light-emitting device having the same
EP0764963A1 (en) * 1995-09-21 1997-03-26 Matsushita Electronics Corporation Emitter material for cathode ray tube and a method for manufacturing the same
US6033280A (en) * 1995-09-21 2000-03-07 Matsushita Electronics Corporation Method for manufacturing emitter for cathode ray tube
US6222308B1 (en) 1995-09-21 2001-04-24 Matsushita Electronics Corporation Emitter material for cathode ray tube having at least one alkaline earth metal carbonate dispersed or concentrated in a mixed crystal or solid solution
EP0794548A1 (en) * 1996-03-05 1997-09-10 Thomson-Csf Thermionic cathode and manufacturing method
FR2745951A1 (en) * 1996-03-05 1997-09-12 Thomson Csf THERMOIONIC CATHODE AND MANUFACTURING METHOD THEREOF
US5925976A (en) * 1996-11-12 1999-07-20 Matsushita Electronics Corporation Cathode for electron tube having specific emissive material

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