JPS5650038A - Electromagnetic focusing type colour picture tube - Google Patents

Electromagnetic focusing type colour picture tube

Info

Publication number
JPS5650038A
JPS5650038A JP12409279A JP12409279A JPS5650038A JP S5650038 A JPS5650038 A JP S5650038A JP 12409279 A JP12409279 A JP 12409279A JP 12409279 A JP12409279 A JP 12409279A JP S5650038 A JPS5650038 A JP S5650038A
Authority
JP
Japan
Prior art keywords
magnetic field
fluorescent surface
picture tube
surface side
focusing type
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.)
Granted
Application number
JP12409279A
Other languages
Japanese (ja)
Other versions
JPH0139623B2 (en
Inventor
Kunio Shimada
Kuniharu Osakabe
Kyohei Fukuda
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 JP12409279A priority Critical patent/JPS5650038A/en
Publication of JPS5650038A publication Critical patent/JPS5650038A/en
Publication of JPH0139623B2 publication Critical patent/JPH0139623B2/ja
Granted 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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses

Abstract

PURPOSE:To reduce the influence of the magnetic field component which crosses perpendicularly to the course of side beam by making the distribution of magnetic field in the course of electron beam asymmetrical on the fluorescent surface side and the cathode side. CONSTITUTION:On the fluorescent surface side of an annular permanent magnet 4, a yoke 20 having a large outer diameter and asymmetrical shape to the cathode side is arranged. Due to the existence of this yoke 20, the distribution of magnetic field at the electron beam passage is made asymmetric on the fluorescent surface side and the cathode side, and the displacement of the side beam in Y direction at the inlet of deflecting magnetic field is made zero or nearly zero. Therefore, the aberration between three electron beams is nearly eliminated even in the case of horizontal deflection.
JP12409279A 1979-09-28 1979-09-28 Electromagnetic focusing type colour picture tube Granted JPS5650038A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12409279A JPS5650038A (en) 1979-09-28 1979-09-28 Electromagnetic focusing type colour picture tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12409279A JPS5650038A (en) 1979-09-28 1979-09-28 Electromagnetic focusing type colour picture tube

Publications (2)

Publication Number Publication Date
JPS5650038A true JPS5650038A (en) 1981-05-07
JPH0139623B2 JPH0139623B2 (en) 1989-08-22

Family

ID=14876719

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12409279A Granted JPS5650038A (en) 1979-09-28 1979-09-28 Electromagnetic focusing type colour picture tube

Country Status (1)

Country Link
JP (1) JPS5650038A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490644A (en) * 1981-09-02 1984-12-25 Tokyo Shibaura Denki Kobashiki Kaisha Magnetic focusing type cathode ray tube
JPH0290699U (en) * 1988-12-28 1990-07-18

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494574A (en) * 1972-04-25 1974-01-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494574A (en) * 1972-04-25 1974-01-16

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4490644A (en) * 1981-09-02 1984-12-25 Tokyo Shibaura Denki Kobashiki Kaisha Magnetic focusing type cathode ray tube
JPH0290699U (en) * 1988-12-28 1990-07-18

Also Published As

Publication number Publication date
JPH0139623B2 (en) 1989-08-22

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