JPS57158932A - Cathode-ray tube - Google Patents

Cathode-ray tube

Info

Publication number
JPS57158932A
JPS57158932A JP4385281A JP4385281A JPS57158932A JP S57158932 A JPS57158932 A JP S57158932A JP 4385281 A JP4385281 A JP 4385281A JP 4385281 A JP4385281 A JP 4385281A JP S57158932 A JPS57158932 A JP S57158932A
Authority
JP
Japan
Prior art keywords
magnet
cathode
ray tube
pole
coil holder
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
JP4385281A
Other languages
Japanese (ja)
Inventor
Yoshihiko Miyata
Koichi Nakajima
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 JP4385281A priority Critical patent/JPS57158932A/en
Publication of JPS57158932A publication Critical patent/JPS57158932A/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
    • H01J29/84—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection
    • H01J29/845—Traps for removing or diverting unwanted particles, e.g. negative ions, fringing electrons; Arrangements for velocity or mass selection by means of magnetic systems

Abstract

PURPOSE:To obtain a cathode-ray tube which is short in whole length by a construction wherein the cathode-ray tube employs an electron gun with an ion trap utilizing the magnetic field of a magnet as the magnetic field for ion trapping, part of a deflecting coil holder being composed of the magnet. CONSTITUTION:In place of a band 42 for tightening a deflecting coil holder 41, an ion trapping magnet 3 comprising a magnet 31, a pole-tip 32, and a non- magnetic spring 33 is used. Accordingly, the ion trapping portion of an electron gun 2 can be moved to the position of the deflecting coil holder 41 which is close to the fluorescent screen and by that much the whole length of a cathode- ray tube can be shortened. In addition a non-magnetic screw 32 in place of the spring may be used to put the ends of pole-tips 32a close to each other, while the coil and the magnet may be fixed to a neck 11. Furthermore, without employing individual magnet and pole-tip, the whole may be constructed of a permanent magnetic material.
JP4385281A 1981-03-27 1981-03-27 Cathode-ray tube Pending JPS57158932A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4385281A JPS57158932A (en) 1981-03-27 1981-03-27 Cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4385281A JPS57158932A (en) 1981-03-27 1981-03-27 Cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS57158932A true JPS57158932A (en) 1982-09-30

Family

ID=12675239

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4385281A Pending JPS57158932A (en) 1981-03-27 1981-03-27 Cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS57158932A (en)

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