US3866080A - Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams - Google Patents

Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams Download PDF

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Publication number
US3866080A
US3866080A US386639A US38663973A US3866080A US 3866080 A US3866080 A US 3866080A US 386639 A US386639 A US 386639A US 38663973 A US38663973 A US 38663973A US 3866080 A US3866080 A US 3866080A
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United States
Prior art keywords
beams
paths
gun
plane
plates
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Expired - Lifetime
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US386639A
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English (en)
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William Henry Barkow
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RCA Licensing Corp
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RCA Corp
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Application filed by RCA Corp filed Critical RCA Corp
Priority to US386639A priority Critical patent/US3866080A/en
Priority to CA204,753A priority patent/CA1012598A/en
Priority to GB3158674A priority patent/GB1478059A/en
Priority to NL7410331A priority patent/NL7410331A/xx
Priority to IT69455/74A priority patent/IT1016765B/it
Priority to FR7427118A priority patent/FR2240522B1/fr
Priority to JP49090665A priority patent/JPS5046264A/ja
Priority to DE2438254A priority patent/DE2438254C3/de
Application granted granted Critical
Publication of US3866080A publication Critical patent/US3866080A/en
Assigned to RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE reassignment RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, PRINCETON, NJ 08540, A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: RCA CORPORATION, A CORP. OF DE
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    • 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
    • H01J29/701—Systems for correcting deviation or convergence of a plurality of beams by means of magnetic fields at least
    • H01J29/707—Arrangements intimately associated with parts of the gun and co-operating with external magnetic excitation devices

Definitions

  • ABSTRACT The cathode ray tube electron gun has means for generating and directing a plurality of electron beams along substantially coplanar paths.
  • Two sets of magnetic plates provide independent enhancement of magnetic fields for deflecting the beams perpendicularly to the plane of the paths and in the plane of the paths. Plates in the first set are located between each of the paths and outwardly of the outermost paths. Plates in the second set are in pairs, each pair having one plate on each side of a beam perpendicular to the plane of the beams.
  • the present invention relates to an improved inline electron gun for a cathode ray tube. Particularly, it relates to an inline electron gun having an improved convergence assembly. Although the improved gun is primarily intended for use in a color tube having a linetype color phosphor screen, the gun could be used in a well-known dot-type color tube having a screen of substantially circular color phosphor dots.
  • An inline electron gun is one designed to generate at least two, and preferably three, electron beams in a common plane and to direct those beams along generally convergent paths toward the tube screen.
  • the gun may be designed to initially aim the beams, from the cathodes, towards convergence at the screen, as shown in FIG. 4 of the Moodey US. Pat. No. 2,957,106, wherein the beam apertures in the gun electrode are aligned along convergent paths.
  • the conventional delta type three gun shadow mask kinescope previously described requires four independent motions, three radial and one tangential, to converge the three beams on the cathode ray tube screen.
  • the horizontal inline three gun shadow mask cathode ray tube also requires four independent motions for convergence. These are horizontal and vertical motion of each of the two outside beams. If the prior art pole piece pairs of the delta type guns were used for horizontal motion in an inline gun and another set of pole pieces were used for vertical motion, the neck length of the cathode ray tube would have to be increased and the distance between the convergence plane and the deflection plane would have to be increased thereby resulting in increased degrouping errors. Therefore, it
  • An inline electron gun for a cathode ray tube includes means for generating and directing a plurality of electron beams along substantially coplanar paths.
  • First magnetic means coplanar with the electron beams are located between each path and outwardly of the outermost paths.
  • the first magnetic means provide independent enhancement of a magnetic field for deflecting the beams perpendicular to the plane of the paths.
  • Second magnetic means perpendicular to the plane of the beams are located on each side of each beam.
  • the second magnetic means provide independent enhancement of another magnetic field for deflecting the beams within the plane of the beams.
  • FIG. 1 is a perspective partial view of an inline electron gun having a convergence assembly embodying the present invention
  • FIG. 2 is a complete side view of the electron gun of FIG. 1; 7
  • FIG. 3 is a front end view of the convergence assembly with its associated convergence coils.
  • FIG. 1 shows the front end of a three beam inline electron gun 10.
  • a convergence assembly 12 comprises ten enhancer type magnetic or high permeability material plates, 14-23, arranged in three crosses of four pole pieces each. Each cross surrounds one of the three beams 24, 26 or 28 and provides for horizontal and vertical motion for each beam.
  • the enhancer plates of the convergence assembly fall into two categories based on the beam correction they permit.
  • a set of four plates 20-23, aligned coplanar with the beam paths 24, 26 and 28, extend between each of the beam paths and outwardly of the outermost paths to the exterior of the electron gun. These plates permit bending the beams in directions normal to the horizontal plane containing the electron paths.
  • the second set of plates, 14-19 comprises pairs'of plates extending from each of the beam paths to the edge of the gun. These plates extend 'in planes that are substantially normal to the beam path plane and parallel to each other. This second set of plates permits deflection of the beams in the horizontal direction of the beam path plane.
  • each of the enhancer plates 14-23 is attached to a nonmagnetic circular disk 30 which is held to a slightly larger disc 32 by clips 34.
  • the larger disk 32 is attached directly to the final electrodes 36 of the gun.
  • Each disk has three apertures 38, 40 and 42 therein for providing passages spect to the electron beams 24, 26 and 28.
  • FIG. 2 A side view of the complete gun 10 is illustrated in FIG. 2.
  • Each portion of the three beam gun comprises a cathode assembly 48, a control grid 50, a screen grid 52, a focus electrode 54, and an anode 56 all off which are mounted in axially aligned relationship along six insulator, e.g., glass support rods 58.
  • the cathode assembly 48 control grid 50 and screen grid 52 are supported from the rods 58 by integral strap-like tabs 60.
  • the focus electrodes 54 and anodes 56 are supported from the rods 58 by straps 62 and 64, respectively.
  • Spring bulb spacers 66 attached to the disk 32, provide location and support for the electron gun in the neck of a cathode ray tube.
  • Heater filaments 68 for the cathodes are supported from the rods 58 by sectional straps 70.
  • the novel convergence assembly previously described can be used with an external driver assembly 72, as shown in FIG. 3, to provide X and Y motion on each of the three beams.
  • This driver assembly 72 consists of two ferrite cores 74 and 76, each having three coil assemblies (82, 84 and 86 and 88, 90 and 92, re-
  • the magnetic flux required for horizontal convergence motion of one of the outer electron beams is generated by one pair of coils with each coil wound around one of the outer legs of the E core driving that beam.
  • excitation of coils 88 and 92 form a field that runs vertically through the beam path 28 and is enhanced or concentrated by plates 16 and 19. Since the electron beam moves perpendicularly to the lines of flux of the field, the beam 28 is deflected horizontally by excitation of coils 88 and 92. Of course, direction of the deflection is dependent on the polarity of the field.
  • the magnetic flux required for vertical convergence motion of this outer beam 28 is generated by the coil 90 around the central leg of the same E core 76.
  • the lines of flux from this coil 90 have a return path via the two outer legs of the core 76.
  • Each of the three coils on an E core is composed of two windings, to provide the desired convergence motions at horizontal and vertical scanning frequencies.
  • the additional pair of coils 78 and 80 are mounted in a vertical plane above and below the central beam 26. These coils generate the magnetic flux required for horizontal convergence motion of the central beam 26.
  • the convergence assembly provides 5-of-freedom relative to the three beams, (e.g., horizontal and vertical motion for each of the two outer beams and horizontal motion for the central beam).
  • the fifth degree-0ffreedom provides motion for the central beam to compensate for the interaction of the adjacent fields. If the central beam were completely shielded, only 4-menedom would be necessary. The 4.-of-freedom are sufficient for convergence to the central beam spot at any point on the screen.
  • An additional degree of freedom namely, vertical motion of the central beam, substantially independent of the other 5 of freedom, may be provided by suitably connecting the two pairs of outer coils of the two E cores.
  • the two coils on the outer legs of one E core are driven to serve as a north pole and those of the other E core as a south pole for the required magnetic flux. Since the fields on any outer beam are equal they cancel at the outer beams and act mainly on the central beam.
  • this coplanar convergence assembly with 6-of-freedom permits one to converge statically at any point in the immediate vicinity in the center of the screen (within a circle radius of one inch above the center).
  • the added degree-of-freedom may be useful in correcting for gun misalignment by proper choice of the point of static (center) convergence.
  • an inline electron gun for a cathode ray tube including means for generating and directing three electron beams along substantially coplanar paths, the improvement comprising:

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US386639A 1973-08-08 1973-08-08 Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams Expired - Lifetime US3866080A (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
US386639A US3866080A (en) 1973-08-08 1973-08-08 Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams
CA204,753A CA1012598A (en) 1973-08-08 1974-07-15 Inline electron gun having an improved convergence assembly
GB3158674A GB1478059A (en) 1973-08-08 1974-07-17 Inline electron gun having a convergence assembly
NL7410331A NL7410331A (nl) 1973-08-08 1974-08-01 Uitgelijnd elektronenkanon, met een verbeterd convergeringssamenstel.
IT69455/74A IT1016765B (it) 1973-08-08 1974-08-02 Cannone elettronico allineato aven te un sistema di convergenza perfe zionato
FR7427118A FR2240522B1 (enrdf_load_stackoverflow) 1973-08-08 1974-08-05
JP49090665A JPS5046264A (enrdf_load_stackoverflow) 1973-08-08 1974-08-06
DE2438254A DE2438254C3 (de) 1973-08-08 1974-08-08 Konvergenzanordnung für eine Kathodenstrahlröhre vom In-Line-Typ

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US386639A US3866080A (en) 1973-08-08 1973-08-08 Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams

Publications (1)

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US3866080A true US3866080A (en) 1975-02-11

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US386639A Expired - Lifetime US3866080A (en) 1973-08-08 1973-08-08 Inline electron gun having magnetically permeable plates for enhancing convergence of electron beams

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US (1) US3866080A (enrdf_load_stackoverflow)
JP (1) JPS5046264A (enrdf_load_stackoverflow)
CA (1) CA1012598A (enrdf_load_stackoverflow)
DE (1) DE2438254C3 (enrdf_load_stackoverflow)
FR (1) FR2240522B1 (enrdf_load_stackoverflow)
GB (1) GB1478059A (enrdf_load_stackoverflow)
IT (1) IT1016765B (enrdf_load_stackoverflow)
NL (1) NL7410331A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057747A (en) * 1974-10-14 1977-11-08 Tokyo Shibaura Electric Company, Ltd. In-line plural beam color cathode ray tube having deflection defocus correcting elements
US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures
FR2391555A1 (fr) * 1977-05-18 1978-12-15 Int Standard Electric Corp Ecran a tube cathodique pour television en couleur
DE2907300A1 (de) * 1978-02-27 1979-09-06 Philips Nv Farbbildwiedergaberoehre
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
EP0073473A3 (en) * 1981-09-02 1983-07-20 Tokyo Shibaura Denki Kabushiki Kaisha A magnetic focusing type cathode ray tube
EP0073472A3 (en) * 1981-09-02 1983-07-20 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic focusing type cathode ray tube
US4396862A (en) * 1978-05-01 1983-08-02 Rca Corporation Color picture tube with means for affecting magnetic deflection fields in electron gun area
EP0090107A1 (en) * 1982-03-31 1983-10-05 International Business Machines Corporation Convergence unit for in-line colour cathode ray tube
EP0164771A1 (de) * 1984-05-07 1985-12-18 Koninklijke Philips Electronics N.V. Bildwiedergaberöhre
EP0126458A3 (en) * 1983-05-18 1986-05-07 Matsushita Electronics Corporation Color cathode ray tube apparatus
US4682073A (en) * 1982-04-02 1987-07-21 Alcatel N.V. Electron optics for the electron beam generating system of a color picture tube
US4748372A (en) * 1984-07-20 1988-05-31 U.S. Philips Corporation Color display tube

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2661024B2 (ja) * 1986-12-27 1997-10-08 ソニー株式会社 陰極線管

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939979A (en) * 1957-04-26 1960-06-07 Sol L Reiches Color pure cathode ray tube display mechanism
US3363128A (en) * 1963-10-30 1968-01-09 Cft Cie Francaise De Televisio Convergence system for a tricolor, three-gun television tube

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939979A (en) * 1957-04-26 1960-06-07 Sol L Reiches Color pure cathode ray tube display mechanism
US3363128A (en) * 1963-10-30 1968-01-09 Cft Cie Francaise De Televisio Convergence system for a tricolor, three-gun television tube

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4057747A (en) * 1974-10-14 1977-11-08 Tokyo Shibaura Electric Company, Ltd. In-line plural beam color cathode ray tube having deflection defocus correcting elements
US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures
FR2391555A1 (fr) * 1977-05-18 1978-12-15 Int Standard Electric Corp Ecran a tube cathodique pour television en couleur
US4189659A (en) * 1977-05-18 1980-02-19 International Standard Electric Corporation Color-television picture tube with internal permanent magnets for convergence correction
DE2907300A1 (de) * 1978-02-27 1979-09-06 Philips Nv Farbbildwiedergaberoehre
US4346327A (en) * 1978-02-27 1982-08-24 U.S. Philips Corporation Display tube for displaying color pictures
US4396862A (en) * 1978-05-01 1983-08-02 Rca Corporation Color picture tube with means for affecting magnetic deflection fields in electron gun area
US4370593A (en) * 1980-12-30 1983-01-25 Rca Corporation In-line electron gun and method for modifying the same
EP0073472A3 (en) * 1981-09-02 1983-07-20 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic focusing type cathode ray tube
EP0073473A3 (en) * 1981-09-02 1983-07-20 Tokyo Shibaura Denki Kabushiki Kaisha A magnetic focusing type cathode ray tube
US4490644A (en) * 1981-09-02 1984-12-25 Tokyo Shibaura Denki Kobashiki Kaisha Magnetic focusing type cathode ray tube
US4495439A (en) * 1981-09-02 1985-01-22 Tokyo Shibaura Denki Kabushiki Kaisha Magnetic focusing type cathode ray tube
EP0090107A1 (en) * 1982-03-31 1983-10-05 International Business Machines Corporation Convergence unit for in-line colour cathode ray tube
US4470029A (en) * 1982-03-31 1984-09-04 International Business Machines Corporation Convergence unit for in-line color cathode ray tube
US4682073A (en) * 1982-04-02 1987-07-21 Alcatel N.V. Electron optics for the electron beam generating system of a color picture tube
EP0126458A3 (en) * 1983-05-18 1986-05-07 Matsushita Electronics Corporation Color cathode ray tube apparatus
EP0164771A1 (de) * 1984-05-07 1985-12-18 Koninklijke Philips Electronics N.V. Bildwiedergaberöhre
US4691139A (en) * 1984-05-07 1987-09-01 U.S. Philips Corporation Display tube having ferromagnetic field shapers to prevent beam defocussing
US4748372A (en) * 1984-07-20 1988-05-31 U.S. Philips Corporation Color display tube

Also Published As

Publication number Publication date
GB1478059A (en) 1977-06-29
IT1016765B (it) 1977-06-20
DE2438254B2 (de) 1978-11-16
FR2240522B1 (enrdf_load_stackoverflow) 1978-04-28
DE2438254C3 (de) 1979-07-19
JPS5046264A (enrdf_load_stackoverflow) 1975-04-24
NL7410331A (nl) 1975-02-11
FR2240522A1 (enrdf_load_stackoverflow) 1975-03-07
CA1012598A (en) 1977-06-21
DE2438254A1 (de) 1975-02-27

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AS Assignment

Owner name: RCA LICENSING CORPORATION, TWO INDEPENDENCE WAY, P

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:RCA CORPORATION, A CORP. OF DE;REEL/FRAME:004993/0131

Effective date: 19871208