GB347500A - Improvements relating to the cathodes of electron discharge tubes or thermionic valves - Google Patents

Improvements relating to the cathodes of electron discharge tubes or thermionic valves

Info

Publication number
GB347500A
GB347500A GB15106/30A GB1510630A GB347500A GB 347500 A GB347500 A GB 347500A GB 15106/30 A GB15106/30 A GB 15106/30A GB 1510630 A GB1510630 A GB 1510630A GB 347500 A GB347500 A GB 347500A
Authority
GB
United Kingdom
Prior art keywords
nickel
coated
cathodes
electron
improvements relating
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
GB15106/30A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB347500A publication Critical patent/GB347500A/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

Landscapes

  • Discharge Lamp (AREA)

Abstract

347,500. Discharge apparatus. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13A, Emmasingel, Eindhoven, Holland. May 16, 1930, No. 15106. Convention date, Oct. 9, 1929. [Class 39 (i).] A cathode for a valve or R÷ntgen ray tube consists of a core 1 of refractory metal such as tungsten, molybdenum or tantalum coated at least partly with a layer 2 of metal such as nickel having a lower melting point on which is wound a wire 3 coated at least partly with electron-emitting material such as alkaline-earth metal or oxide. The wire 3 may be of nickel, or of tungsten coated with nickel, and the electron-emitting material may be applied before or after winding. The core extends beyond the layer so as to reduce the conduction of heat from the cathode. Specifications 274,981 and 275,449, [both in Class 39 (i), Electric lamps, Arc &c.], are referred to.
GB15106/30A 1929-10-09 1930-05-16 Improvements relating to the cathodes of electron discharge tubes or thermionic valves Expired GB347500A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL347500X 1929-10-09

Publications (1)

Publication Number Publication Date
GB347500A true GB347500A (en) 1931-04-30

Family

ID=19784933

Family Applications (1)

Application Number Title Priority Date Filing Date
GB15106/30A Expired GB347500A (en) 1929-10-09 1930-05-16 Improvements relating to the cathodes of electron discharge tubes or thermionic valves

Country Status (1)

Country Link
GB (1) GB347500A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755074C (en) * 1936-09-20 1953-02-23 Siemens Schuckertwerke A G Gas or vapor-filled discharge tubes with a high-performance glow cathode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE755074C (en) * 1936-09-20 1953-02-23 Siemens Schuckertwerke A G Gas or vapor-filled discharge tubes with a high-performance glow cathode

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