US3376464A - Beam deflection system comprising a flattened helix - Google Patents

Beam deflection system comprising a flattened helix Download PDF

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Publication number
US3376464A
US3376464A US596011A US59601166A US3376464A US 3376464 A US3376464 A US 3376464A US 596011 A US596011 A US 596011A US 59601166 A US59601166 A US 59601166A US 3376464 A US3376464 A US 3376464A
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United States
Prior art keywords
helical winding
winding
deflection
electrodes
electrode
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Expired - Lifetime
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US596011A
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English (en)
Inventor
Loty Charles
Boutry Georges-Albert
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Laboratoires dElectronique Philips SAS
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Lab D Electronique Et De Physi
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J25/00—Transit-time tubes, e.g. klystrons, travelling-wave tubes, magnetrons
    • H01J25/78—Tubes with electron stream modulated by deflection in a resonator
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/70—Arrangements for deflecting ray or beam
    • H01J29/708—Arrangements for deflecting ray or beam in which the transit time of the electrons has to be taken into account

Definitions

  • the invention relates to a charged particle beam deflection apparatus, consisting of a system of two electrodes, one of which is a helical Winding of substantially flat conductive ribbon, having a flattened part parallel to the axis of the winding.
  • the invention is particularly, though not exclusively, related to a cathode-ray tube, comprising an electron gun for the production of an electron beam and comprising a charged particle beam deflection apparatus of the above kind for the deflection of the electron beam.
  • the system consisting of the two electrodes in the form of a transmission line.
  • An electromagnetic wave propagating along a transmission line and influencing a charged particle beam propagating in its immediate neighborhood can give an adequate deflection of the beam, when the velocities of the wave and of the beam are substantially equal. This situation can easily be obtained.
  • the transmission line may reduce the apparent velocity of the electro magnetic wave to a fraction of its velocity of propagation in the medium, for instance to a tenth of it, and the velocity of the charged particle beam may be fitted by means of a convenient electric field.
  • the second electrode of the deflection system is disposed within the helical winding.
  • the second electrode is a stainless steel arbor surrounded by a ceramic spacer around which the helical winding is wound.
  • the stainless steel arbor has a flattened part parallel to its axis, and parallel to the flattened part of the helical winding.
  • the ceramic spacer has an opening between these flattened parts of the electrodes. The charged particle beam passes through this opening, which is rectangular in cross-section.
  • the helical winding is disposed within the second electrode of the deflection system.
  • the second electrode is a hollow cylinder, flattened along one side and wherein the helical winding is wound on an insulating former contained within the second deflection electrode the insulating former being of such shape and so positioned, that the helical winding has a flattened region parallel to, immediately opposite from the flattened regions of the second electrode.
  • the flattened regions of the electrodes lie on opposite sides of the char ed particle beam path and extend along it.
  • each of the two electrodes is a helical winding.
  • the two helical windings are herein placed on opposite sides of the path of the charged particle beam in a symmetrical manner.
  • each of the two helical windings is disposed about a grounded planar conductive sheet. Each winding is wound close to the grounded plane in a flat oval fashion.
  • the known apparatus indicated above can give an adequate deflection of the beam for signals of a fairly high frequency. Yet, these apparatus permit the existence of a dispersion of the phase velocities which cannot be neglected.
  • the other electrode in a charged particle beam deflection apparatus consisting of a system of two electrodes, one of which is a helical winding of substantially flat conductive ribbon, having a flattened part parallel to the axis of the winding, the other electrode has two parts, an inner part disposed within the helical winding and an outer part practically completely surrounding the helical winding.
  • the walls of these parts facing the helical winding are coaxial with the helical winding and have cross-sections of a form similar to the form of the crosssection of the helical winding.
  • the dispersion of the phase velocities is highly reduced, the second electrode being so constructed and positioned as to substantially prevent the lines of force of the electrical field closing longitudinally.
  • the lines of force of the electrical field may easily close longitudinally and so one removes from the mode of propagation T.E.M.
  • the helical winding has, all over the winding, a constant distance to the inner part and a constant distance to the outer part of the second electrode in order to have a characteristic impedance which is constant along the circuit.
  • the distances between the helical winding and the two parts of the second electrode are preferably not longer than the pitch of the winding in order to assure a practically transversal closure of the lines of force of the electrical field. Greater distance would not prevent as satisfactorily as possible the longitudinal closure of lines of force of the electrical field and so the deformation of signals by the dispersion of the phase velocities would not be prevented as satisfactorily as possible.
  • the electrodes are preferably fixed together by means of a few thin insulating sheets so as to have a minimum of dielectric material between the electrodes.
  • dielectric material increases the dispersion changing locally the velocity of the wave.
  • the invention concerns particularly a cathode-ray tube, comprising an electron gun for the production of an electron beam and comprising a charged particle beam deflection apparatus, as just described, for the deflection of the electron beam, wherein according to the invention the path of the electron beam extends in the space between the helical winding and the second electrode of said apparatus in the same general direction as the axis of the winding and along the flattened part of the winding.
  • a cathode ray tube one has the advantages of the described deflection apparatus, so that it involves the possibility of transmitting signals with frequencies of a very broad band-width.
  • the cathode ray tube is so constructed that the beam extends along the flattened parts of the electrodes. These parts permit having a uniform transverse electric field along them, where as the curved parts create a slight distortion of the field.
  • FIGURE 1 represents a longitudinal section of a charged particle beam deflection apparatus
  • FIGURE 2 represents a cross-section of a charged particle beam deflection apparatus
  • FIGURE 3 represents on a large scale the helical winding of a charged particle beam deflection apparatus.
  • a helical winding 5 of substantially flat conductive ribbon which serves as one of the deflecting electrodes of the apparatus.
  • the second electrode of the apparatus has two parts, an inner part 8 and an outer part 1. These parts are electrically connected, which is not shown in the drawing.
  • the outer part 1 is a block of metal, which has the form of a parallelopiped. It consists of two parts asseru 4 and the helical winding is so positioned within the tunnel that all the points of the exterior surface of the winding have the same distance to the wall of the tunnel.
  • the inner part 8 of the second electrode is a flat ribbon of metal. Its cross-section resembles the cross-section of the tunnel 4 and it is so positioned within the helical winding 5, that all the points of the interior surface of the winding have the same distance to it.
  • the helical winding 5 and the inner part 8 of the second electrode are maintained in position within the tunnel 4 by means of three thin sheets of mica 6. Two of these sheets are disposed between the helical winding 5 and the wall of the tunnel 4.
  • the third one is disposed between the helical winding 5 and the inner part 8 of the second electrode.
  • the two extremities of the helical winding 5 are connected to coaxial plugs 9 by means of which the voltage signals may be applied to the transmission line and the circuit may be closed by its characteristic impedance.
  • the distance between the helical winding 5 and the inner part 8 of the second electrode is 1.2 mm. and the distance between the helical winding 5 and the outer part 1 of the second electrode is 1.8 mm.
  • the pitch of the helical winding is 2.8 mm. This results in a characteristic impedance of ohms and a practically negligible dispersion of the phase velocities.
  • the reference It) in FIG. 2 refers to a preferred position of the path of the charged particle beam. In this position the path of the charged particle beam extends between the flattened parts of the electrodes and from this position the mica sheets cannot be seen. A practically equally favorable position exists just opposite to this one on the other side of the helical winding between the helical winding and the inner part 8 of the second electrode.
  • cathode ray tubes according to the invention comprising an embodiment of the deflection apparatus, as just described, the electron gun and the deflection apparatus are so positioned in the cathode ray tube, that the electron beam path has one of these preferred positions in the deflection apparatus.
  • the electrodes of the deflection apparatus in these tubes are preferably gilt to prevent oxidation during the finishing of the tubes.
  • a cathode ray tube comprising a source of electrons, means for projecting an electron beam from said source between the electrodes of a beam deflection apparatus, said apparatus consisting of a system of two electrodes, one of which is a helical winding of substantially flat conductive ribbon having a flattened part parallel to the axis of the winding, the other electrode comprising an inner flat part disposed within and extending along the axis of the helical winding and parallel to said flattened part, and an outer part practically completely surrounding the helical winding the walls of which parts facing the helical winding are coaxial with the helical winding and have cross-sections of a form similar to the form of the crosssection of the helical winding.
  • a cathode ray tube as claimed in claim 1, characterized in that the helical winding has all over the winding a constant distance to the inner part and a constant distance to the outer part of the second electrode.
  • a cahode ray tube as claimed in claim 2, characterized in that the distances between the helical winding and the two parts of the second electrodes are not longer than the pitch of the winding.
  • a cathode ray tube as claimed in claim 3, characterized in that the electrodes are fixed together by means of a few thin insulating sheets.
  • a cathode ray tube as claimed in claim 1 characterized in that the path of the electron beam extends in the space between the helical winding and the second electrode of said apparatus, in the same general direction as the axis of the winding and along the flattened part of the winding.

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)
  • Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
  • Particle Accelerators (AREA)
  • Electron Beam Exposure (AREA)
  • Microwave Tubes (AREA)
US596011A 1965-11-30 1966-11-21 Beam deflection system comprising a flattened helix Expired - Lifetime US3376464A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR40195A FR1465559A (fr) 1965-11-30 1965-11-30 Perfectionnements aux lignes à retard

Publications (1)

Publication Number Publication Date
US3376464A true US3376464A (en) 1968-04-02

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ID=8593741

Family Applications (1)

Application Number Title Priority Date Filing Date
US596011A Expired - Lifetime US3376464A (en) 1965-11-30 1966-11-21 Beam deflection system comprising a flattened helix

Country Status (5)

Country Link
US (1) US3376464A (de)
DE (1) DE1564470C3 (de)
FR (1) FR1465559A (de)
GB (1) GB1142519A (de)
NL (1) NL6616538A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629643A (en) * 1967-10-31 1971-12-21 Commissariat Energie Atomique Device for producing bursts of charged particles
US3694689A (en) * 1971-02-24 1972-09-26 Tektronix Inc Electron beam deflection apparatus
US3696266A (en) * 1969-09-19 1972-10-03 Tsutomu Nishino Electron beam deflecting device
US3849695A (en) * 1973-07-19 1974-11-19 Tektronix Inc Distributed deflection structure employing dielectric support
US4093891A (en) * 1976-12-10 1978-06-06 Tektronix, Inc. Traveling wave deflector for electron beams
US4104568A (en) * 1976-09-27 1978-08-01 International Telephone & Telegraph Corporation Scan-converter tube system
US4328466A (en) * 1972-07-03 1982-05-04 Watkins-Johnson Company Electron bombarded semiconductor device with doubly-distributed deflection means
US5038075A (en) * 1988-10-28 1991-08-06 Iwatsu Electric Co., Ltd. Traveling-wave deflection system in a cathode-ray tube with conducting core on helical conductor.
US5172029A (en) * 1991-01-22 1992-12-15 The United States Of America As Represented By The United States Department Of Energy Shielded helix traveling wave cathode ray tube deflection structure
US5210464A (en) * 1991-05-15 1993-05-11 The United States Of America As Represented By The Department Of Energy Cavity resonance absorption in ultra-high bandwidth CRT deflection structure by a resistive load

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680823A (en) * 1949-07-07 1954-06-08 Csf Electron optic device for a beam propagating perpendicularly to crossed magnetic and electric fields
US3005128A (en) * 1957-10-18 1961-10-17 Edgerton Germeshausen And Grie Electron-beam deflection system
US3181110A (en) * 1961-07-24 1965-04-27 Jessie H Raborg Solderless electric connector
US3218503A (en) * 1962-06-27 1965-11-16 Zenith Radio Corp Electron beam devices

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2680823A (en) * 1949-07-07 1954-06-08 Csf Electron optic device for a beam propagating perpendicularly to crossed magnetic and electric fields
US3005128A (en) * 1957-10-18 1961-10-17 Edgerton Germeshausen And Grie Electron-beam deflection system
US3181110A (en) * 1961-07-24 1965-04-27 Jessie H Raborg Solderless electric connector
US3218503A (en) * 1962-06-27 1965-11-16 Zenith Radio Corp Electron beam devices

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3629643A (en) * 1967-10-31 1971-12-21 Commissariat Energie Atomique Device for producing bursts of charged particles
US3696266A (en) * 1969-09-19 1972-10-03 Tsutomu Nishino Electron beam deflecting device
US3694689A (en) * 1971-02-24 1972-09-26 Tektronix Inc Electron beam deflection apparatus
US4328466A (en) * 1972-07-03 1982-05-04 Watkins-Johnson Company Electron bombarded semiconductor device with doubly-distributed deflection means
US3849695A (en) * 1973-07-19 1974-11-19 Tektronix Inc Distributed deflection structure employing dielectric support
US4104568A (en) * 1976-09-27 1978-08-01 International Telephone & Telegraph Corporation Scan-converter tube system
US4093891A (en) * 1976-12-10 1978-06-06 Tektronix, Inc. Traveling wave deflector for electron beams
DE2752881A1 (de) * 1976-12-10 1978-06-15 Tektronix Inc Wanderwellen-ablenkeinheit
US5038075A (en) * 1988-10-28 1991-08-06 Iwatsu Electric Co., Ltd. Traveling-wave deflection system in a cathode-ray tube with conducting core on helical conductor.
US5172029A (en) * 1991-01-22 1992-12-15 The United States Of America As Represented By The United States Department Of Energy Shielded helix traveling wave cathode ray tube deflection structure
US5210464A (en) * 1991-05-15 1993-05-11 The United States Of America As Represented By The Department Of Energy Cavity resonance absorption in ultra-high bandwidth CRT deflection structure by a resistive load

Also Published As

Publication number Publication date
FR1465559A (fr) 1967-01-13
DE1564470C3 (de) 1975-10-02
DE1564470A1 (de) 1970-01-08
GB1142519A (en) 1969-02-12
DE1564470B2 (de) 1975-02-20
NL6616538A (de) 1967-05-31

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