GB251582A - Improvements relating to thermionic valves or electron discharge tubes - Google Patents

Improvements relating to thermionic valves or electron discharge tubes

Info

Publication number
GB251582A
GB251582A GB21073/25A GB2107325A GB251582A GB 251582 A GB251582 A GB 251582A GB 21073/25 A GB21073/25 A GB 21073/25A GB 2107325 A GB2107325 A GB 2107325A GB 251582 A GB251582 A GB 251582A
Authority
GB
United Kingdom
Prior art keywords
filament
cathode
improvements relating
discharge tubes
electron 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
GB21073/25A
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 GB251582A publication Critical patent/GB251582A/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

  • Discharge Lamps And Accessories Thereof (AREA)

Abstract

251,582. Naamlooze Vennootschap Philips' Gloeilampenfabrieken. April 30, 1925, [Convention date]. Vacuum tubes.-In a thermionic valve having a hollow cathode 1 of iron or other magnetic material heated by a filament 4 or other heating- element the leading-in wires 6 for the filament are sealed through one side of the pinch 15 and the leading-in wires for the other electrodes, particularly the wire 10 for the grid 2, are sealed through the other side of the pinch as far as possible from the filament leads. The cathode is preferably of chrome-iron, and is made longer than the filament and grid so as to reduce electrostatic and electromagnetic effects due to the filament; for the same purpose the central point of the filament is connected with the electrode. The outer surface of the cathode may be coated with an electron-emitting layer.
GB21073/25A 1925-04-30 1925-08-22 Improvements relating to thermionic valves or electron discharge tubes Expired GB251582A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL251582X 1925-04-30

Publications (1)

Publication Number Publication Date
GB251582A true GB251582A (en) 1926-07-22

Family

ID=19781130

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21073/25A Expired GB251582A (en) 1925-04-30 1925-08-22 Improvements relating to thermionic valves or electron discharge tubes

Country Status (1)

Country Link
GB (1) GB251582A (en)

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