GB678258A - Improvements in and relating to electron emitters - Google Patents

Improvements in and relating to electron emitters

Info

Publication number
GB678258A
GB678258A GB5910/51A GB591051A GB678258A GB 678258 A GB678258 A GB 678258A GB 5910/51 A GB5910/51 A GB 5910/51A GB 591051 A GB591051 A GB 591051A GB 678258 A GB678258 A GB 678258A
Authority
GB
United Kingdom
Prior art keywords
cathode
boride
sintered
march
paste
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
GB5910/51A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB678258A publication Critical patent/GB678258A/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
    • H01J1/14—Solid thermionic cathodes characterised by the material
    • H01J1/148—Solid thermionic cathodes characterised by the material with compounds having metallic conductive properties, e.g. lanthanum boride, as an emissive material
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C7/00—Constructional parts, or assemblies thereof, of cells; Servicing or operating of cells
    • C25C7/02—Electrodes; Connections thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/04—Electrodes; Screens
    • H01J17/06—Cathodes
    • H01J17/066—Cold cathodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0064—Tubes with cold main electrodes (including cold cathodes)
    • H01J2893/0065—Electrode systems
    • H01J2893/0066—Construction, material, support, protection and temperature regulation of electrodes; Electrode cups

Abstract

678,258. Cathode materials and processing. BRITISH THOMSON-HOUSTON CO., Ltd. March 12, 1951 [March 31, 1950], No. 5910/51. Class 39 (i). A thermionic cathode comprises, or consists of, at least one boride, e.g. hexaboride, of calcium, barium, strontium, thorium, uranium or the rare earth metals such as lanthanum, cerium, neodymium or misch metal. Powdered boron and metal powder or filings may be mixed and pressed and sintered to 1375-1850 C. in vacuum or helium or argon to the required shape or to produce a mass which is ball-milled and made into a spray or paste with amyl acetate, water or a cellulose binder. The paste may be applied to a directlyheated cathode, which consists of a helix wound on a wire core, and sintered at 1600‹ C. A boride rod, supported and connected by conducting coatings to end rods, may be heated directly or by a surrounding helix. A screengrid valve has a cathode in the form of a rimmed disc 19 which contains sintered boride 22 and is heated by thermal and thermionic radiation from a filament 20. Emission curves of various borides are included in the Specification.
GB5910/51A 1950-03-31 1951-03-12 Improvements in and relating to electron emitters Expired GB678258A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US153212A US2639399A (en) 1950-03-31 1950-03-31 Electron emitter

Publications (1)

Publication Number Publication Date
GB678258A true GB678258A (en) 1952-08-27

Family

ID=22546234

Family Applications (2)

Application Number Title Priority Date Filing Date
GB5910/51A Expired GB678258A (en) 1950-03-31 1951-03-12 Improvements in and relating to electron emitters
GB17063/51A Expired GB683940A (en) 1950-03-31 1951-07-18 Improvements in and relating to cathodes for electric discharge apparatus

Family Applications After (1)

Application Number Title Priority Date Filing Date
GB17063/51A Expired GB683940A (en) 1950-03-31 1951-07-18 Improvements in and relating to cathodes for electric discharge apparatus

Country Status (6)

Country Link
US (1) US2639399A (en)
BE (1) BE502232A (en)
CH (1) CH301197A (en)
DE (1) DE856666C (en)
GB (2) GB678258A (en)
NL (1) NL80503C (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2744073A (en) * 1952-11-22 1956-05-01 Battelle Development Corp Thermionic emitter materials
DE971413C (en) * 1953-10-02 1959-01-22 Siemens Ag Device for crucible zone melting
US3312856A (en) * 1963-03-26 1967-04-04 Gen Electric Rhenium supported metallic boride cathode emitters
US3505553A (en) * 1966-05-12 1970-04-07 Philips Corp Radio-interference-free low-pressure mercury-vapor lamp
US3440475A (en) * 1967-04-11 1969-04-22 Lokomotivbau Elektrotech Lanthanum hexaboride cathode system for an electron beam generator
US3944866A (en) * 1974-04-08 1976-03-16 Canadian Patents & Development Ltd. Thermionic emitter of lanthanum strontium vanadates
JPS5451776A (en) * 1977-10-03 1979-04-23 Nippon Hoso Kyokai <Nhk> Gas discharge display panel
US4260525A (en) * 1978-11-27 1981-04-07 Rca Corporation Single-crystal hexaborides and method of preparation
FR2445605A1 (en) * 1978-12-27 1980-07-25 Thomson Csf DIRECT HEATING CATHODE AND HIGH FREQUENCY ELECTRONIC TUBE COMPRISING SUCH A CATHODE
DE4305558A1 (en) * 1993-02-24 1994-08-25 Asea Brown Boveri Process for the manufacture of wires which are especially suitable for cathodes of electron tubes
US6025038A (en) * 1998-08-26 2000-02-15 Board Of Regents Of The University Of Nebraska Method for depositing rare-earth boride onto a substrate
US6077617A (en) * 1998-08-26 2000-06-20 Board Of Regents Of The University Of Nebraska Rare-earth boride thin film system
WO2008054451A2 (en) * 2006-02-06 2008-05-08 The University Of North Carolina At Chapel Hill Synthesis and processing of rare-earth boride nanowires as electron emitters
DE102011013262A1 (en) 2011-03-07 2012-09-13 Adlantis Dortmund Gmbh Electron-ionization source has photoelectrons that are generated from atmospheric-stable layer by ultra-violet source and are actuated with distance of acceleration in dimension of average free path length of gas

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1023485A (en) * 1908-11-20 1912-04-16 Orlando M Thowless Illuminant for electrical incandescent lamps.
US2117636A (en) * 1934-03-24 1938-05-17 Gerald B Tjoflat Thermionic electrode
US2501089A (en) * 1945-11-29 1950-03-21 Martin A Pomerantz Thermionic electron emitter
US2502331A (en) * 1948-12-21 1950-03-28 Rca Corp Geiger-muller counter for radioactive emission

Also Published As

Publication number Publication date
NL80503C (en)
GB683940A (en) 1952-12-10
US2639399A (en) 1953-05-19
BE502232A (en)
DE856666C (en) 1952-11-24
CH301197A (en) 1954-08-31

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