IL43254A - Gridded electron gun employing a concave cathode emitter - Google Patents

Gridded electron gun employing a concave cathode emitter

Info

Publication number
IL43254A
IL43254A IL43254A IL4325473A IL43254A IL 43254 A IL43254 A IL 43254A IL 43254 A IL43254 A IL 43254A IL 4325473 A IL4325473 A IL 4325473A IL 43254 A IL43254 A IL 43254A
Authority
IL
Israel
Prior art keywords
concave
cathode
control grid
apertures
cathode emitter
Prior art date
Application number
IL43254A
Other versions
IL43254A0 (en
Original Assignee
Varian Ass Ciates
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 Varian Ass Ciates filed Critical Varian Ass Ciates
Publication of IL43254A0 publication Critical patent/IL43254A0/en
Publication of IL43254A publication Critical patent/IL43254A/en

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
    • H01J3/029—Schematic arrangements for beam forming
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J23/00—Details of transit-time tubes of the types covered by group H01J25/00
    • H01J23/02—Electrodes; Magnetic control means; Screens

Landscapes

  • Microwave Tubes (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Claims (6)

IS CLAIMED IS:
1. In a gridded electron gun: thermionic cathode emitter means for providing copious electron emission and having a generally concave cathode emitting surface with a generally circular perimeter; anode electrode means for drawing electron emission from said cathode emitter means into a beam of electrons and having a central beam aperture through which the beam is drawn from said cathode emitter, said central beam aperture being of smaller transverse cross -sectional area than that of said cathode emitting surface such that the beam experiences convergent flow from said cathode through said central anode aperture; multi-apertured concave control grid electrode means interposed between said cathode emitter means and said anode means for controlling the flow of electrons from said cathode emitter to said anode means, said concave control grid web having a convex surface disposed overlaying said concave emitter surface and being uniformly spaced from and generally conforming to said concave emitting surface of said cathode emitter means, said web having a plurality of closely spaced beam apertures of generally uniform size for drawing a plurality of non-intercepting beamlets of electrons through said control grid to form said convergent flow composite beam flowing through said anode, those of said apertures in said control grid which overlay said concave emitting surface exclusive of the center aperture being arranged in a pattern of at least two concentric circular rows, and means for applying independent operating potentials
2. The apparatus of claim 1 wherein said cathode emitter surface is generally spherically concave, and wherein said web of said control grid means is also spherically concave, each of said grid and cathode means having a common axis of revolution with differing radii of curvature generated from essentially a common center to provide generally uniform spacing between said cathode emitter surface and said concave web of said control grid means.
3. The apparatus of claim 2 wherein those of said apertures in said control grid, which overlay said concave emitting surface, exclusive of the center aperture, are arranged in a pattern of two concentric circular rows.
4. The apparatus of claim 2 wherein said apertures in said control grid are circular apertures.
5. The apparatus of claim 1 wherein said concave emittin surface of said cathode emitter means is constituted of a multitude of dimpled concave cathode emitting surfaces of substantially lesser radii of curvature than that of said composite concave cathode emitting surface, each of said dimpled cathode emitting surfaces being concave in two orthogonal directions, and said dimples being of generally uniform concave area with the centers of each of said dimples being centrally aligned along the beam path with respective centers of said apertures in said multi-apertured control grid means.
6. The apparatus of claim 2 wherein said concave emittin surface of said cathode emitter means is constituted of a multitude of dimpled concave cathode emitting surfaces of substantially lesser radii curvature than that . of said composite concave cathode emitting surface, each of said oimpled cathode emitting surfaces being concave in two orthogonal directions, and said dimples being of generally uniform concave area with the centers of each of said dimples being aligned along the beam path with respective centers of said apertures in said multi-apertured control grid means.
IL43254A 1972-09-28 1973-09-18 Gridded electron gun employing a concave cathode emitter IL43254A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US29320572A 1972-09-28 1972-09-28

Publications (2)

Publication Number Publication Date
IL43254A0 IL43254A0 (en) 1973-11-28
IL43254A true IL43254A (en) 1976-02-29

Family

ID=23128137

Family Applications (1)

Application Number Title Priority Date Filing Date
IL43254A IL43254A (en) 1972-09-28 1973-09-18 Gridded electron gun employing a concave cathode emitter

Country Status (5)

Country Link
CA (1) CA977077A (en)
DE (1) DE2348617C2 (en)
FR (1) FR2201535B1 (en)
GB (1) GB1400668A (en)
IL (1) IL43254A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2535724A1 (en) * 1975-08-09 1977-02-17 Licentia Gmbh Cathode ray tube with axis symmetrical cathode - has shadow grid close to cathode which has circular ridges on its surface
FR2496290A1 (en) * 1980-12-12 1982-06-18 Efcis DIGITAL RELAY CIRCUIT BASED ON FREQUENCY
FR2775118B1 (en) * 1998-02-13 2000-05-05 Thomson Tubes Electroniques GRID FOR ELECTRONIC TUBE WITH AXIAL BEAM WITH IMPROVED PERFORMANCE

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2295680A (en) * 1940-10-25 1942-09-15 Westinghouse Electric & Mfg Co Ultra high frequency device with conical collector
US2967260A (en) * 1957-05-31 1961-01-03 Eitel Mccullough Inc Electron tube
US3107313A (en) * 1959-10-30 1963-10-15 Johann R Hechtel Velocity modulated electron tube with cathode means providing plural electron streams
US3500110A (en) * 1967-08-23 1970-03-10 Raytheon Co Noncurrent intercepting electron beam control element
FR1582070A (en) * 1968-04-26 1969-09-26
US3558967A (en) * 1969-06-16 1971-01-26 Varian Associates Linear beam tube with plural cathode beamlets providing a convergent electron stream
DE2210160C3 (en) * 1972-03-02 1975-04-30 Siemens Ag, 1000 Berlin Und 8000 Muenchen Electron gun system for time-of-flight tubes

Also Published As

Publication number Publication date
CA977077A (en) 1975-10-28
DE2348617C2 (en) 1984-09-27
GB1400668A (en) 1975-07-23
DE2348617A1 (en) 1974-04-04
FR2201535A1 (en) 1974-04-26
FR2201535B1 (en) 1977-08-19
IL43254A0 (en) 1973-11-28

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