JPS5679842A - Electromagnetic focusing picture tube - Google Patents

Electromagnetic focusing picture tube

Info

Publication number
JPS5679842A
JPS5679842A JP15681579A JP15681579A JPS5679842A JP S5679842 A JPS5679842 A JP S5679842A JP 15681579 A JP15681579 A JP 15681579A JP 15681579 A JP15681579 A JP 15681579A JP S5679842 A JPS5679842 A JP S5679842A
Authority
JP
Japan
Prior art keywords
crossover point
beams
picture tube
grid
hole diameter
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
JP15681579A
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 JP15681579A priority Critical patent/JPS5679842A/en
Publication of JPS5679842A publication Critical patent/JPS5679842A/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
    • H01J29/48—Electron guns
    • H01J29/50—Electron guns two or more guns in a single vacuum space, e.g. for plural-ray tube
    • H01J29/503—Three or more guns, the axes of which lay in a common plane

Abstract

PURPOSE:To obtain image points of a plurality of electron beams all imaged on a fluorescent screen, by allowing a position, in which a crossover point is formed by an electron beam on a tube axis, to differ from a position, in which a crossover point is formed by an electron beam detached from the tube axis. CONSTITUTION:Though hole diameter of the second grid 4 are formed in same size for all beams, hole diameter for the center beam in the first grid 2a is formed larger than that for side beams. Then the position of a crossover point 15 of the center beam 14C is shifted toward the direction of a florescent screen. Accordingly a larger incident angle of the beam incident upon a magnetic lens 12S is obtained to correlctly image the crossover point 15 on the fluorescent screen 13.
JP15681579A 1979-12-05 1979-12-05 Electromagnetic focusing picture tube Pending JPS5679842A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15681579A JPS5679842A (en) 1979-12-05 1979-12-05 Electromagnetic focusing picture tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15681579A JPS5679842A (en) 1979-12-05 1979-12-05 Electromagnetic focusing picture tube

Publications (1)

Publication Number Publication Date
JPS5679842A true JPS5679842A (en) 1981-06-30

Family

ID=15635929

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15681579A Pending JPS5679842A (en) 1979-12-05 1979-12-05 Electromagnetic focusing picture tube

Country Status (1)

Country Link
JP (1) JPS5679842A (en)

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