GB653707A - Improvements in or relating to electric discharge tubes comprising an indirectly heated cathode - Google Patents

Improvements in or relating to electric discharge tubes comprising an indirectly heated cathode

Info

Publication number
GB653707A
GB653707A GB21286/48A GB2128648A GB653707A GB 653707 A GB653707 A GB 653707A GB 21286/48 A GB21286/48 A GB 21286/48A GB 2128648 A GB2128648 A GB 2128648A GB 653707 A GB653707 A GB 653707A
Authority
GB
United Kingdom
Prior art keywords
wires
electric discharge
discharge tubes
heated cathode
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
GB21286/48A
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
Philips Electronics 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, Philips Electronics NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB653707A publication Critical patent/GB653707A/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

653,707. Electric discharge tubes. PHILIPS ELECTRICAL, Ltd. Aug. 12, 1948, No. 21286. Convention date, Aug. 15, 1947. [Class 39 (i)] An indirectly-heated cathode comprises a heater 2 insulatingly housed in a tubular metal envelope 1 which has secured to it, as by welding, a number of wires 3 coated with electron-emitting material, the wires being not more than 50 microns thick, and spaced by at least three wire diameters. The wires may be woven into a gauze forming a flat or cylindrical cathode surface. The spacing between the limbs of the tube 1 is not greater than 200 wire diameters to obtain uniform heating of the gauze. The tube 1 may be formed by swageing, rolling or drawing a complex of relatively insulated conductors and may be bent more than once, e.g. M- instead of U-shape.
GB21286/48A 1947-08-15 1948-08-12 Improvements in or relating to electric discharge tubes comprising an indirectly heated cathode Expired GB653707A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL269933X 1947-08-15

Publications (1)

Publication Number Publication Date
GB653707A true GB653707A (en) 1951-05-23

Family

ID=19781880

Family Applications (1)

Application Number Title Priority Date Filing Date
GB21286/48A Expired GB653707A (en) 1947-08-15 1948-08-12 Improvements in or relating to electric discharge tubes comprising an indirectly heated cathode

Country Status (6)

Country Link
US (1) US2532838A (en)
BE (1) BE484368A (en)
CH (1) CH269933A (en)
DE (1) DE809445C (en)
FR (1) FR970342A (en)
GB (1) GB653707A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215885A (en) * 1961-11-09 1965-11-02 Csf Cathode structure
US3449616A (en) * 1965-07-20 1969-06-10 Thomson Houston Comp Francaise Tubular mesh cathode for high-power electronic tubes

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2212827A (en) * 1937-12-29 1940-08-27 Fides Gmbh Hot cathode for high power
NL52447C (en) * 1938-02-04

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3215885A (en) * 1961-11-09 1965-11-02 Csf Cathode structure
US3449616A (en) * 1965-07-20 1969-06-10 Thomson Houston Comp Francaise Tubular mesh cathode for high-power electronic tubes

Also Published As

Publication number Publication date
CH269933A (en) 1950-07-31
FR970342A (en) 1951-01-03
DE809445C (en) 1951-07-30
BE484368A (en)
US2532838A (en) 1950-12-05

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