GB1264765A - - Google Patents

Info

Publication number
GB1264765A
GB1264765A GB1264765DA GB1264765A GB 1264765 A GB1264765 A GB 1264765A GB 1264765D A GB1264765D A GB 1264765DA GB 1264765 A GB1264765 A GB 1264765A
Authority
GB
United Kingdom
Prior art keywords
grooves
cathode
pattern
grid structure
forming
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
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 filed Critical
Publication of GB1264765A publication Critical patent/GB1264765A/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

Abstract

1,264,765. Electrode materials and processing. VARIAN ASSOCIATES. 16 June, 1970 [16 June, 1969], No. 29222/70. Heading H1D. A method of fabricating a dispenser cathode for a convergent stream electron gun comprises forming a pattern of crossing grooves 9 in the concave face of a cathode blank defining an array of cells, forming concave facet 3 in the cells and incorporating in the groove pattern a multi-apertured grid structure 8. The structure acts to focus electron beamlets through apertures 7 in a control grid 6 identical with grid structure 8. The cathode blank is of porous W impregnated first with Cu or plastics material which is subsequently removed and replaced by Ba. Grooves 9 forming a hexagonal pattern are milled, chemically etched or electrical discharge machined then circular or hexagonal facets 3 are machined or electrical discharge machined. Grid structure 8 of Mo, coated with C, Ti, Zr, or Ir to prevent electron emission, is supported in but not touching the grooves 9 by a member 11 which acts as a heat sink. Alternatively, the structure 8 is brazed with Mo-Ni or Mo-Ru in the grooves. The cathode forms part of a high convergence gun for use in linear beam tubes, e.g. as described in Specification 1,191,755.
GB1264765D 1969-06-16 1970-06-16 Expired GB1264765A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83345869A 1969-06-16 1969-06-16

Publications (1)

Publication Number Publication Date
GB1264765A true GB1264765A (en) 1972-02-23

Family

ID=25264477

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1264765D Expired GB1264765A (en) 1969-06-16 1970-06-16

Country Status (6)

Country Link
US (1) US3594885A (en)
JP (1) JPS5220817B1 (en)
CA (1) CA922878A (en)
DE (1) DE2029675A1 (en)
FR (1) FR2052633A5 (en)
GB (1) GB1264765A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535467A1 (en) * 1975-08-08 1977-02-17 Licentia Gmbh Cathode grid unit production technique using spark erosion - produces grid for use close to cathode emission surface and with activated coating

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843902A (en) * 1972-08-24 1974-10-22 Varian Associates Gridded convergent flow electron gun
US3967150A (en) * 1975-01-31 1976-06-29 Varian Associates Grid controlled electron source and method of making same
US4583021A (en) * 1983-04-18 1986-04-15 Litton Systems, Inc. Electron gun with improved cathode and shadow grid configuration
JPS6273362U (en) * 1985-10-24 1987-05-11
US4734073A (en) * 1986-10-10 1988-03-29 The United States Of America As Represented By The Secretary Of The Army Method of making a thermionic field emitter cathode
FR2723502B1 (en) * 1994-08-04 1997-01-10 Valeo Electronique COLLECTOR TERMINAL FOR THE CONTACT OF A BATTERY FOR THE SUPPLY OF AN ELECTRONIC CIRCUIT, ELECTRONIC CIRCUIT AND REMOTE TRANSMITTER INCORPORATING THE SAME
KR100782370B1 (en) * 2006-08-04 2007-12-07 삼성전자주식회사 Ion analysis system based on analyzers of ion energy distribution using retarded electric fields
US7723699B2 (en) * 2007-06-26 2010-05-25 Varian Semiconductor Equipment Associates, Inc. Cathode having electron production and focusing grooves, ion source and related method
US7978804B2 (en) * 2007-12-10 2011-07-12 Schlumberger Technology Corporation Low power neutron generators
WO2015101537A1 (en) * 2013-12-30 2015-07-09 Mapper Lithography Ip B.V. Cathode arrangement, electron gun, and lithography system comprising such electron gun

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE550302A (en) * 1955-08-15
US3067486A (en) * 1957-06-20 1962-12-11 Itt Target electrode for barrier grid storage tube and method of making same
US2977496A (en) * 1958-12-04 1961-03-28 Machlett Lab Inc Electrode structure for electron tubes
US3139552A (en) * 1960-03-07 1964-06-30 Hughes Aircraft Co Charged particle gun with nonspherical emissive surface
NL135267C (en) * 1961-10-04

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535467A1 (en) * 1975-08-08 1977-02-17 Licentia Gmbh Cathode grid unit production technique using spark erosion - produces grid for use close to cathode emission surface and with activated coating

Also Published As

Publication number Publication date
CA922878A (en) 1973-03-20
JPS5220817B1 (en) 1977-06-06
FR2052633A5 (en) 1971-04-09
US3594885A (en) 1971-07-27
DE2029675A1 (en) 1971-01-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee