GB485439A - Improvements in or relating to electric discharge tubes - Google Patents

Improvements in or relating to electric discharge tubes

Info

Publication number
GB485439A
GB485439A GB23722/37A GB2372237A GB485439A GB 485439 A GB485439 A GB 485439A GB 23722/37 A GB23722/37 A GB 23722/37A GB 2372237 A GB2372237 A GB 2372237A GB 485439 A GB485439 A GB 485439A
Authority
GB
United Kingdom
Prior art keywords
electron
emitting substance
substance
relating
electric discharge
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
GB23722/37A
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 GB485439A publication Critical patent/GB485439A/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
    • H01J1/20—Cathodes heated indirectly by an electric current; Cathodes heated by electron or ion bombardment

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

485,439. Thermionic cathodes. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN. Aug. 30, 1937, No. 23722. Convention date, Sept. 1, 1936. [Class 39 (i)] An indirectly heated cathode of the type in which the electron-emitting surface is carried on a base of copper or a copper alloy of less thermal emissivity than nickel, which is only partly coated with the electron-emitting substance, is protected against the volatilization of the base metal from those parts not coated with the electron-emitting substance, by coating them with an insulating substance such as magnesia and alumina. Preferably, the body of the cathode is tubular and surrounds the heater. The emitting substance, such as barium carbonate, and the insulating layer are applied by cataphoresis.
GB23722/37A 1936-09-01 1937-08-30 Improvements in or relating to electric discharge tubes Expired GB485439A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL485439X 1936-09-01

Publications (1)

Publication Number Publication Date
GB485439A true GB485439A (en) 1938-05-19

Family

ID=19786625

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23722/37A Expired GB485439A (en) 1936-09-01 1937-08-30 Improvements in or relating to electric discharge tubes

Country Status (2)

Country Link
FR (1) FR826135A (en)
GB (1) GB485439A (en)

Also Published As

Publication number Publication date
FR826135A (en) 1938-03-23

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