GB800219A - Improvements in or relating to cathodes of the dispenser type - Google Patents

Improvements in or relating to cathodes of the dispenser type

Info

Publication number
GB800219A
GB800219A GB24558/56A GB2455856A GB800219A GB 800219 A GB800219 A GB 800219A GB 24558/56 A GB24558/56 A GB 24558/56A GB 2455856 A GB2455856 A GB 2455856A GB 800219 A GB800219 A GB 800219A
Authority
GB
United Kingdom
Prior art keywords
porous
aug
apertures
alkaline earth
metal
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
GB24558/56A
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 GB800219A publication Critical patent/GB800219A/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
    • H01J1/28—Dispenser-type cathodes, e.g. L-cathode

Landscapes

  • Solid Thermionic Cathode (AREA)

Abstract

800,219. Thermionic cathode constructions. PHILIPS ELECTRICAL INDUSTRIES, Ltd. Aug. 10, 1956 [Aug. 15, 1955], No. 24558/56. Class 39(1). A dispenser cathode comprising a body of porous refractory metal in or behind which is provided a supply of alkaline earth metal compound has at least a part of its emissive surface covered by non-porous refractory metal having a plurality of apertures through which emission takes place. The apertures are spaced apart less than the migratory distance of the alkaline earth metal, so that during operation the whole cathode surface becomes covered by migration. In Fig. 2 the non-porous metal is formed as crossed strips or wires 4 of molybdenum pressed into the porous body 1. In Fig. 3 (not shown) it is formed as a thin perforated plate with a scalloped edge.
GB24558/56A 1955-08-15 1956-08-10 Improvements in or relating to cathodes of the dispenser type Expired GB800219A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US528296A US2864028A (en) 1955-08-15 1955-08-15 Thermionic dispenser cathode

Publications (1)

Publication Number Publication Date
GB800219A true GB800219A (en) 1958-08-20

Family

ID=24105076

Family Applications (1)

Application Number Title Priority Date Filing Date
GB24558/56A Expired GB800219A (en) 1955-08-15 1956-08-10 Improvements in or relating to cathodes of the dispenser type

Country Status (6)

Country Link
US (1) US2864028A (en)
BE (1) BE550302A (en)
CH (1) CH344139A (en)
DE (1) DE1047321B (en)
FR (1) FR1173168A (en)
GB (1) GB800219A (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1180435B (en) * 1958-12-12 1964-10-29 Varta Ag Continuous process for the production of sintered frameworks for foil electrodes, in particular strip electrodes, for electric accumulators
US3113236A (en) * 1959-06-23 1963-12-03 Philips Corp Oxide dispenser type 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
US3594885A (en) * 1969-06-16 1971-07-27 Varian Associates Method for fabricating a dimpled concave dispenser cathode incorporating a grid
GB1582837A (en) * 1976-07-10 1981-01-14 Emi Varian Ltd Electron emitter
US4101800A (en) * 1977-07-06 1978-07-18 The United States Of America As Represented By The Secretary Of The Navy Controlled-porosity dispenser cathode
GB2100502B (en) * 1978-11-30 1983-08-03 Varian Associates Dispenser cathodes
FR2469792A1 (en) * 1979-11-09 1981-05-22 Thomson Csf THERMO-IONIC CATHODE, ITS MANUFACTURING METHOD, AND ELECTRONIC TUBE INCORPORATING SUCH A CATHODE
JPS59501887A (en) * 1982-10-12 1984-11-08 ヒユ−ズ・エアクラフト・カンパニ− Controlled porosity dispenser cathode
DE3913338C2 (en) * 1989-04-22 1999-12-02 Aeg Elektronische Roehren Gmbh Investment material, in particular for cathodes of electron tubes, method for producing such an investment material and use of such an investment material
FR2647952A1 (en) * 1989-05-30 1990-12-07 Thomson Tubes Electroniques IMPREGNATED THERMOELECTRONIC CATHODE FOR ELECTRONIC TUBE
JPH11339633A (en) * 1997-11-04 1999-12-10 Sony Corp Impregnated cathode and manufacture therefor and electron gun and electronic tube

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121589A (en) * 1934-06-28 1938-06-21 Westinghouse Electric & Mfg Co Emissive incandescent cathode
GB450035A (en) * 1935-05-07 1936-07-09 Ets Claude Paz & Silva Improvements in electrodes for high-pressure metallic vapour electric discharge tubes
US2452075A (en) * 1941-12-18 1948-10-26 Raytheon Mfg Co Velocity modulation electron discharge tube
DE879872C (en) * 1942-08-19 1953-06-15 Siemens Ag Cathode for generating an electron beam
US2459841A (en) * 1943-06-08 1949-01-25 Glenn F Rouse Cathode
US2647216A (en) * 1950-04-01 1953-07-28 Rca Corp Dispenser cathode
DE895479C (en) * 1951-11-20 1953-11-02 Siemens Ag Cathode for electrical discharge vessels
NL83577C (en) * 1952-07-23

Also Published As

Publication number Publication date
CH344139A (en) 1960-01-31
FR1173168A (en) 1959-02-20
DE1047321B (en) 1958-12-24
US2864028A (en) 1958-12-09
BE550302A (en)

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