GB734311A - Improvements in or relating to cathodes for use in electric discharge tubes, tubes comprising such cathodes and methods of manufacturing such cathodes - Google Patents

Improvements in or relating to cathodes for use in electric discharge tubes, tubes comprising such cathodes and methods of manufacturing such cathodes

Info

Publication number
GB734311A
GB734311A GB5269/53A GB526953A GB734311A GB 734311 A GB734311 A GB 734311A GB 5269/53 A GB5269/53 A GB 5269/53A GB 526953 A GB526953 A GB 526953A GB 734311 A GB734311 A GB 734311A
Authority
GB
United Kingdom
Prior art keywords
cathodes
tubes
relating
manufacturing
methods
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
GB5269/53A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries Ltd
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 Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB734311A publication Critical patent/GB734311A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/042—Manufacture, activation of the emissive part
    • H01J9/047—Cathodes having impregnated bodies
    • 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
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • 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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Abstract

734,311. Cathode materials and processing. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Feb. 25, 1953 [Feb. 27, 1952], No. 5269/53. Drawings to Specification. Class 39 (1). A cathode consists of a porous high-melting point material such as tungsten, into the pores of which is melted a compound of an alkaline earth metal oxide with at least one of the oxides of aluminium, silicon, boron, thorium or beryllium. The alkaline earth oxide should preferably form 60-70 per cent of the whole. The pores may be ground closed to prevent emission in unwanted directions. Specifications 701,871 and 707,512 are referred to.
GB5269/53A 1952-02-27 1953-02-25 Improvements in or relating to cathodes for use in electric discharge tubes, tubes comprising such cathodes and methods of manufacturing such cathodes Expired GB734311A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US273607A US2700000A (en) 1952-02-27 1952-02-27 Thermionic cathode and method of manufacturing same

Publications (1)

Publication Number Publication Date
GB734311A true GB734311A (en) 1955-07-27

Family

ID=23044673

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5269/53A Expired GB734311A (en) 1952-02-27 1953-02-25 Improvements in or relating to cathodes for use in electric discharge tubes, tubes comprising such cathodes and methods of manufacturing such cathodes

Country Status (9)

Country Link
US (1) US2700000A (en)
BE (1) BE517981A (en)
CH (1) CH318053A (en)
DE (1) DE1089483B (en)
ES (2) ES207960A1 (en)
FR (1) FR1077589A (en)
GB (1) GB734311A (en)
IT (1) IT500079A (en)
NL (1) NL96177C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514945A1 (en) * 1981-10-20 1983-04-22 Thomson Csf Indirectly heated cathode e.g. for CRT - where thin tube made of refractory metal is used to carry pastille impregnated with emitter material, esp. barium scandate

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE531122A (en) * 1953-08-14
NL97571C (en) * 1953-11-18
US2813807A (en) * 1954-07-19 1957-11-19 Philips Corp Method of making a dispenser cathode
US3041209A (en) * 1955-06-28 1962-06-26 Gen Electric Method of making a thermionic cathode
BE559450A (en) * 1956-07-24
BE561832A (en) * 1956-10-24
BE563664A (en) * 1957-01-03
US3075066A (en) * 1957-12-03 1963-01-22 Union Carbide Corp Article of manufacture and method of making same
US2975320A (en) * 1958-12-03 1961-03-14 Rca Corp Low-temperature plasma source
US3076916A (en) * 1959-01-21 1963-02-05 Semicon Associates Inc Impregnated tungsten cathode structures and methods for fabricating same
US2995674A (en) * 1959-02-27 1961-08-08 Raytheon Co Impregnated cathodes
US3155864A (en) * 1960-03-21 1964-11-03 Gen Electric Dispenser cathode
NL266639A (en) * 1960-07-05
US3160780A (en) * 1961-01-17 1964-12-08 Philips Corp Indirectly heated cathode
US3258636A (en) * 1961-09-01 1966-06-28 Electron emitter with activator of sill cide, boride or carbide of solid solu- tion of barium and at least one other alkaline earth metal
NL6515843A (en) * 1965-12-07 1967-06-08
NL6602973A (en) * 1966-03-08 1967-09-11
US3514324A (en) * 1967-05-01 1970-05-26 Kopco Ind Tungsten coating of dispenser cathode
US3538570A (en) * 1968-02-28 1970-11-10 Otto G Koppius Thermionic dispenser cathode
US4097762A (en) * 1975-08-14 1978-06-27 International Telephone & Telegraph Corporation Xenon arc discharge lamp having a particular electrode composition and wherein the arc discharge is obtained without heating the electrode
US4636749A (en) * 1979-08-13 1987-01-13 Brunswick Corporation Pulsed magnetron tube having improved electron emitter assembly
US4377505A (en) * 1980-12-29 1983-03-22 General Electric Company Electrical resistor and fabrication thereof
WO1985002071A1 (en) * 1983-11-02 1985-05-09 Brunswick Corporation Tuning apparatus for a radio frequency power device
US4675570A (en) * 1984-04-02 1987-06-23 Varian Associates, Inc. Tungsten-iridium impregnated cathode
US5418070A (en) * 1988-04-28 1995-05-23 Varian Associates, Inc. Tri-layer impregnated cathode
KR920003185B1 (en) * 1990-01-31 1992-04-23 삼성전관 주식회사 Dispensor cathode and the manufacturing method of the same
JP2985467B2 (en) * 1992-01-22 1999-11-29 三菱電機株式会社 Method for producing impregnated cathode
DE19652822A1 (en) * 1996-12-18 1998-06-25 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Sintered electrode
US20090284124A1 (en) * 2008-04-22 2009-11-19 Wolfgang Kutschera Cathode composed of materials with different electron works functions

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL15389C (en) * 1923-01-12
CH159791A (en) * 1931-02-14 1933-01-31 Aeg Hot cathode for electrical discharge vessels.
US2389060A (en) * 1943-08-13 1945-11-13 Callite Tungsten Corp Refractory body of high electronic emission
US2547869A (en) * 1947-10-31 1951-04-03 Sylvania Electric Prod Fluorescent lamp electrode

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2514945A1 (en) * 1981-10-20 1983-04-22 Thomson Csf Indirectly heated cathode e.g. for CRT - where thin tube made of refractory metal is used to carry pastille impregnated with emitter material, esp. barium scandate

Also Published As

Publication number Publication date
ES207960A1 (en) 1953-07-16
CH318053A (en) 1956-12-15
NL96177C (en)
IT500079A (en)
DE1089483B (en) 1960-09-22
BE517981A (en)
FR1077589A (en) 1954-11-09
US2700000A (en) 1955-01-18
ES209589A1 (en) 1953-07-16

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