JPS575250A - Electromagnetic focusing cathode ray tube - Google Patents

Electromagnetic focusing cathode ray tube

Info

Publication number
JPS575250A
JPS575250A JP7772880A JP7772880A JPS575250A JP S575250 A JPS575250 A JP S575250A JP 7772880 A JP7772880 A JP 7772880A JP 7772880 A JP7772880 A JP 7772880A JP S575250 A JPS575250 A JP S575250A
Authority
JP
Japan
Prior art keywords
magnetic field
control element
field control
rotated
deflection magnetic
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.)
Pending
Application number
JP7772880A
Other languages
Japanese (ja)
Inventor
Soichi Sakurai
Kyohei Fukuda
Kuniharu Osakabe
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.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP7772880A priority Critical patent/JPS575250A/en
Publication of JPS575250A publication Critical patent/JPS575250A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • H01J29/702—Convergence correction arrangements therefor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2229/00—Details of cathode ray tubes or electron beam tubes
    • H01J2229/56—Correction of beam optics
    • H01J2229/568—Correction of beam optics using supplementary correction devices
    • H01J2229/5681—Correction of beam optics using supplementary correction devices magnetic
    • H01J2229/5682—Permanently magnetised materials, e.g. permanent magnets

Abstract

PURPOSE:To improve the spot shape at the circumference of screen, by locating a deflection magnetic field control element for an electromagnetic focusing type inline electron gun to be axially symmetrical against the tube axis while to be asymmetrical against the horizontal and vertical faces containing the tube axis. CONSTITUTION:The electrodes 5, 5 constituting the electrostatic lens for an inline 3 electron gun are made of the magnetic material, then a circular permanent magnet 8 is arranged to form the magnetic main lens 13. A deflection magnetic field control element holder 14a is fixed at the fluorescent face side of said electrode 5 then a deflection magnetic field control element 14 is arranged. Thereafter both side beam pass holes for said holder 14a are provided while rotated from the horizontal line and said element 14 is rotated to be asymmetrical against the horizontal and the vertical faces. Since the both side beams rotated by the focusing magnetic field passes through the center of the deflection magnetic field control element, the halo is eliminated to improve the convergence.
JP7772880A 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube Pending JPS575250A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7772880A JPS575250A (en) 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7772880A JPS575250A (en) 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube

Publications (1)

Publication Number Publication Date
JPS575250A true JPS575250A (en) 1982-01-12

Family

ID=13641951

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7772880A Pending JPS575250A (en) 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube

Country Status (1)

Country Link
JP (1) JPS575250A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63231849A (en) * 1987-03-20 1988-09-27 Hitachi Ltd Deflecting magnetic field control element for color cathode-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63231849A (en) * 1987-03-20 1988-09-27 Hitachi Ltd Deflecting magnetic field control element for color cathode-ray tube

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