JPS55155448A - Focus magnet - Google Patents

Focus magnet

Info

Publication number
JPS55155448A
JPS55155448A JP6237179A JP6237179A JPS55155448A JP S55155448 A JPS55155448 A JP S55155448A JP 6237179 A JP6237179 A JP 6237179A JP 6237179 A JP6237179 A JP 6237179A JP S55155448 A JPS55155448 A JP S55155448A
Authority
JP
Japan
Prior art keywords
ring
yoke
center
around
yoke plate
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
JP6237179A
Other languages
Japanese (ja)
Inventor
Teruo Umehara
Norio Matsumoto
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.)
Proterial Ltd
Original Assignee
Hitachi Metals 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 Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP6237179A priority Critical patent/JPS55155448A/en
Publication of JPS55155448A publication Critical patent/JPS55155448A/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
    • H01J29/58—Arrangements for focusing or reflecting ray or beam
    • H01J29/64—Magnetic lenses
    • H01J29/68—Magnetic lenses using permanent magnets only

Abstract

PURPOSE:To enable an adjustment of a center of magnetic field with ease, by providing a yoke plate at each side of a magnet unit and disposing a ring around said yoke plates. CONSTITUTION:Cylindrical ferrite magnets 1 and 1' stand face to face via a ferromagnetic spacer 2, and a magnetic shunt steel 3 is fixed around said ferrite magnets 1 and 1' to restrain alternation of the center field intensity due to temperature variation. A yoke plate 5 is fixed on each side of a magnet unit 4 and a ring 6 is provided around the outer peripheries of the yoke plates 5. The field intensity at a center P of the yoke can be adjusted by rotating the ring 6 and adjusting the distance W between the front end of the ring 6 and the front yoke plate 5.
JP6237179A 1979-05-21 1979-05-21 Focus magnet Pending JPS55155448A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6237179A JPS55155448A (en) 1979-05-21 1979-05-21 Focus magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6237179A JPS55155448A (en) 1979-05-21 1979-05-21 Focus magnet

Publications (1)

Publication Number Publication Date
JPS55155448A true JPS55155448A (en) 1980-12-03

Family

ID=13198185

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6237179A Pending JPS55155448A (en) 1979-05-21 1979-05-21 Focus magnet

Country Status (1)

Country Link
JP (1) JPS55155448A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848343A (en) * 1981-09-18 1983-03-22 Hitachi Ltd Focusing magnetic field generator
US5469017A (en) * 1992-03-27 1995-11-21 Thomson Tubes & Displays, S.A. Permanent magnet focus unit with integral astigmatism corrector
US5528211A (en) * 1992-01-10 1996-06-18 Thomson Tubes And Displays, S.A. Magnetic focusing device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5032565A (en) * 1973-07-26 1975-03-29
JPH112869A (en) * 1997-06-10 1999-01-06 Sony Corp Desktop screen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5032565A (en) * 1973-07-26 1975-03-29
JPH112869A (en) * 1997-06-10 1999-01-06 Sony Corp Desktop screen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848343A (en) * 1981-09-18 1983-03-22 Hitachi Ltd Focusing magnetic field generator
US5528211A (en) * 1992-01-10 1996-06-18 Thomson Tubes And Displays, S.A. Magnetic focusing device
US5469017A (en) * 1992-03-27 1995-11-21 Thomson Tubes & Displays, S.A. Permanent magnet focus unit with integral astigmatism corrector

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