GB1079342A - Field emission cathode and electron beam tube employing such cathode - Google Patents

Field emission cathode and electron beam tube employing such cathode

Info

Publication number
GB1079342A
GB1079342A GB27653/65A GB2765365A GB1079342A GB 1079342 A GB1079342 A GB 1079342A GB 27653/65 A GB27653/65 A GB 27653/65A GB 2765365 A GB2765365 A GB 2765365A GB 1079342 A GB1079342 A GB 1079342A
Authority
GB
United Kingdom
Prior art keywords
cathode
field emission
lattice plane
emissive material
electron beam
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
GB27653/65A
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.)
Field Emission Corp
Original Assignee
Field Emission Corp
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 Field Emission Corp filed Critical Field Emission Corp
Publication of GB1079342A publication Critical patent/GB1079342A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J3/00—Details of electron-optical or ion-optical arrangements or of ion traps common to two or more basic types of discharge tubes or lamps
    • H01J3/02—Electron guns
    • H01J3/021—Electron guns using a field emission, photo emission, or secondary emission electron source
    • 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
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H01J1/304—Field-emissive cathodes

Landscapes

  • Cold Cathode And The Manufacture (AREA)
  • Solid Thermionic Cathode (AREA)

Abstract

1,079,342. Field emission cathodes; electron beam tubes. FIELD EMISSION CORPORATION. June 30, 1965 [Nov. 2, 1964], No. 27653/65. Heading H1D. A field emission cathode has a predetermined crystal lattice plane oriented at the surface of a sharpened portion of the cathode, and a layer of emissive material coated on the sharpened portion which migrates to, and concentrates at, the predetermined lattice plane upon heating, the coated portion having a lower work function than uncoated portions of the cathode so that elecelectron emission is limited substantially entirely to the predetermined lattice plane. A bonding material is also present in the layer to cause the emissive material to adhere better to the sharpened portion of the cathode. The sharpened portion may be a pointed tip or a knife edge on a heating filament, or on a rod heated by induction or electron bombardment to cause the migration of the emissive material. The cathode may be of W with a 100 or possibly 211 crystal lattice plane oriented at the tip, and the emissive material may be Zr, Hf, Mg, Cs, Ba or Th, which may be bonded to the W with an intermediate layer of O, N, Cl, I or F. Also, the cathode may be of Mo, Pt, Ni, Si or diamond. In particular, a W cathode 32 having a pointed tip is exposed first to O already present in a cathoderay tube or produced by decomposing copper oxide, and then to Zr by heating a Zr-coated filament 36 arranged within control grid 34. The tube is divided into two chambers by collimating electrode 42 which may be disc-sealed through the envelope, and the pressure in the gun chamber is maintained lower by gettering material 80 provided as shown, or between two plates which together form the collimating electrode, Fig. 3 (not shown). The oscilloscope tube shown further includes a magnetic focusing lens 52 with polepieces 54, or a corresponding electrostatic gun lens; a pair of beamblanking deflection plates 56; electrostatic focusing and deflecting electrodes 62-70; and a helical resistive coating 78 for post-deflection acceleration. The cathode may also be used in electron microscopes, charge-image storage tubes and electron beam machining apparatus.
GB27653/65A 1964-11-02 1965-06-30 Field emission cathode and electron beam tube employing such cathode Expired GB1079342A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US408035A US3374386A (en) 1964-11-02 1964-11-02 Field emission cathode having tungsten miller indices 100 plane coated with zirconium, hafnium or magnesium on oxygen binder

Publications (1)

Publication Number Publication Date
GB1079342A true GB1079342A (en) 1967-08-16

Family

ID=23614585

Family Applications (1)

Application Number Title Priority Date Filing Date
GB27653/65A Expired GB1079342A (en) 1964-11-02 1965-06-30 Field emission cathode and electron beam tube employing such cathode

Country Status (5)

Country Link
US (1) US3374386A (en)
DE (1) DE1290637B (en)
FR (1) FR1453926A (en)
GB (1) GB1079342A (en)
NL (1) NL6508856A (en)

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3467878A (en) * 1966-06-27 1969-09-16 Gen Electric Electron discharge device with arrangement for replenishing emissive material on a smooth cathode surface
US3461338A (en) * 1967-01-16 1969-08-12 Ibm Non-inductive filament configuration
GB1291221A (en) * 1968-07-07 1972-10-04 Smith Kenneth C A Electron probe forming system
US3532923A (en) * 1969-03-17 1970-10-06 Ibm Pyrolytic graphite support for lanthanum hexaboride cathode emitter
US3814975A (en) * 1969-08-06 1974-06-04 Gen Electric Electron emission system
US3846660A (en) * 1969-08-06 1974-11-05 Gen Electric Electron beam generating system with collimated focusing means
US3666985A (en) * 1969-10-20 1972-05-30 Gen Electric High resolution electron optic system for camera tubes
NL7003279A (en) * 1970-03-07 1971-09-09
US3694689A (en) * 1971-02-24 1972-09-26 Tektronix Inc Electron beam deflection apparatus
US3869636A (en) * 1972-05-08 1975-03-04 United Aircraft Corp Filament for electron guns
US3809899A (en) * 1972-08-17 1974-05-07 Tektronix Inc Electron-beam tube including a thermionic-field emission cathode for a scanning electron microscope
US3817592A (en) * 1972-09-29 1974-06-18 Linfield Res Inst Method for reproducibly fabricating and using stable thermal-field emission cathodes
US3947716A (en) * 1973-08-27 1976-03-30 The United States Of America As Represented By The Secretary Of The Army Field emission tip and process for making same
JPS5518014B2 (en) * 1974-12-20 1980-05-15
JPS5522741B2 (en) * 1975-01-16 1980-06-18
NL7501932A (en) * 1975-02-19 1976-08-23 Philips Nv FIELD EMISSION SOURCE.
DE3039283A1 (en) * 1979-10-19 1981-05-14 Hitachi, Ltd., Tokyo FIELD EMISSION CATHODE AND METHOD FOR THEIR PRODUCTION
US4325000A (en) * 1980-04-20 1982-04-13 Burroughs Corporation Low work function cathode
CA1141420A (en) * 1980-06-20 1983-02-15 Stephen Lhotsky Method and apparatus for electrolytic sharpening of a filament
US4499405A (en) * 1981-05-20 1985-02-12 Rpc Industries Hot cathode for broad beam electron gun
US4445041A (en) * 1981-06-02 1984-04-24 Hewlett-Packard Company Electron beam blanker
US4588928A (en) * 1983-06-15 1986-05-13 At&T Bell Laboratories Electron emission system
NL8400779A (en) * 1984-03-12 1985-10-01 Philips Nv CATHED BEAM TUBE.
DE3831940A1 (en) * 1988-09-20 1990-04-05 Siemens Ag ELECTRONIC RADIATOR
CA1317035C (en) * 1989-01-25 1993-04-27 Matthias Brunner Method for examining a specimen in a particle beam instrument
EP1983543A1 (en) * 2007-04-20 2008-10-22 ICT Integrated Circuit Testing Gesellschaft für Halbleiterprüftechnik mbH Gun chamber, charged particle beam apparatus and method of operating same
CN102629538B (en) 2012-04-13 2014-03-19 吴江炀晟阴极材料有限公司 Electrode material with low work function and high chemical stability
US11037753B2 (en) * 2018-07-03 2021-06-15 Kla Corporation Magnetically microfocused electron emission source

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1932084A (en) * 1929-08-14 1933-10-24 Westinghouse Electric & Mfg Co Cathode ray oscillograph
DE695645C (en) * 1936-11-17 1940-08-29 Siemens & Halske Akt Ges Process for the production of a cathode for high-voltage tubes with auto-electronic discharge
US2332622A (en) * 1941-10-11 1943-10-26 Bell Telephone Labor Inc Electron discharge device
US2453118A (en) * 1946-05-08 1948-11-09 Western Union Telegraph Co Concentrated arc discharge device
US2687471A (en) * 1948-05-01 1954-08-24 Western Union Telegraph Co Concentrated arc discharge device
US2570124A (en) * 1949-10-20 1951-10-02 Rca Corp Positive ion beam gun
US2886736A (en) * 1954-02-02 1959-05-12 Research Corp Current rectifier
US2919380A (en) * 1957-07-23 1959-12-29 Philco Corp Electron discharge devices
DE1099659B (en) * 1958-08-30 1961-02-16 Zeiss Carl Fa Shielding device
NL266639A (en) * 1960-07-05
NL285235A (en) * 1961-11-08

Also Published As

Publication number Publication date
DE1290637B (en) 1969-03-13
NL6508856A (en) 1966-05-03
FR1453926A (en) 1966-07-22
US3374386A (en) 1968-03-19

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