GB408185A - Improvements in or relating to electron discharge tubes - Google Patents

Improvements in or relating to electron discharge tubes

Info

Publication number
GB408185A
GB408185A GB34831/33A GB3483133A GB408185A GB 408185 A GB408185 A GB 408185A GB 34831/33 A GB34831/33 A GB 34831/33A GB 3483133 A GB3483133 A GB 3483133A GB 408185 A GB408185 A GB 408185A
Authority
GB
United Kingdom
Prior art keywords
less
cathode
grid
wires
microns
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
GB34831/33A
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 GB408185A publication Critical patent/GB408185A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J19/00—Details of vacuum tubes of the types covered by group H01J21/00
    • H01J19/28—Non-electron-emitting electrodes; Screens
    • H01J19/38—Control electrodes, e.g. grid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0001—Electrodes and electrode systems suitable for discharge tubes or lamps
    • H01J2893/0012—Constructional arrangements
    • H01J2893/0015—Non-sealed electrodes

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

408,185. Thermionic valves. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, 13D, Emmasingel, Eindhoven, Holland. Dec. 11, 1933, No. 34831. Convention date, Feb. 6. [Class 39 (i).] A valve with the cathode preferably indirectly heated and with one or more grids has a grid made of a number of parallel sections of wire the thickness of which is less than 100 microns, and the carrier for the emissive layer of the cathode is of material which has a thermal radiation less than that of nickel. As shown the cathode 8 of copper with an emissive layer less than 0.1 m.m. and preferably less than 0.05 m.m., has a heating element 9 and is surrounded by a grid 11, the wires of which may be 50 microns or less mounted on support wires 12 and provided with cooling members 13. The " shadow ratio " between the width of the grid wires and the spaces between them is at least 1 to 4. The anode 14 is cylindrical. Gold silver or alloys thereof may be used for the cathode body.
GB34831/33A 1933-02-06 1933-12-11 Improvements in or relating to electron discharge tubes Expired GB408185A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE408185X 1933-02-06

Publications (1)

Publication Number Publication Date
GB408185A true GB408185A (en) 1934-04-05

Family

ID=6422275

Family Applications (1)

Application Number Title Priority Date Filing Date
GB34831/33A Expired GB408185A (en) 1933-02-06 1933-12-11 Improvements in or relating to electron discharge tubes

Country Status (1)

Country Link
GB (1) GB408185A (en)

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