JPS57113545A - Cathode ray tube apparatus - Google Patents

Cathode ray tube apparatus

Info

Publication number
JPS57113545A
JPS57113545A JP91881A JP91881A JPS57113545A JP S57113545 A JPS57113545 A JP S57113545A JP 91881 A JP91881 A JP 91881A JP 91881 A JP91881 A JP 91881A JP S57113545 A JPS57113545 A JP S57113545A
Authority
JP
Japan
Prior art keywords
center
magnets
magnetic field
axis
centering
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
JP91881A
Other languages
Japanese (ja)
Other versions
JPH0217905B2 (en
Inventor
Shoichi Muramoto
Tamiji Masatoki
Tsuneo Muchi
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.)
Sony Corp
Original Assignee
Sony Corp
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 Sony Corp filed Critical Sony Corp
Priority to JP91881A priority Critical patent/JPS57113545A/en
Publication of JPS57113545A publication Critical patent/JPS57113545A/en
Publication of JPH0217905B2 publication Critical patent/JPH0217905B2/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
    • H01J29/68—Magnetic lenses using permanent magnets only

Abstract

PURPOSE:To make a centering permanent magnet unnecessary by disposing more than two annular focusing permanent magnets one above the other in a way that each circularly reciprocates and by shifting the center of magnetic field distribution of the permanent magnet from a geometrical center. CONSTITUTION:At least 2 pieces of first and second annular focusing permanent magnets Md1 and Md2, which are magnetized in a thickness direction, are disposed at a tabular axis O-O' of a cathode ray tube tabular body 1 in a way that both of which may circularly reciprocate around the tabular axis. At least one of the magnets Md1 and Md2 is magnetized with the center of magnetic field distribution relative to a surface perpendicularly interseting with an axial centr is shifted radially from a geometrical center of the magnet. At this time, the two magnets Md1 and Md2 can from original magnetic focusing lens and at the same time an upper radial directional magnetic field is generated at the axis center to enable electronic beam centering and a centering magnet becomes unnecessary.
JP91881A 1981-01-07 1981-01-07 Cathode ray tube apparatus Granted JPS57113545A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP91881A JPS57113545A (en) 1981-01-07 1981-01-07 Cathode ray tube apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP91881A JPS57113545A (en) 1981-01-07 1981-01-07 Cathode ray tube apparatus

Publications (2)

Publication Number Publication Date
JPS57113545A true JPS57113545A (en) 1982-07-15
JPH0217905B2 JPH0217905B2 (en) 1990-04-23

Family

ID=11487057

Family Applications (1)

Application Number Title Priority Date Filing Date
JP91881A Granted JPS57113545A (en) 1981-01-07 1981-01-07 Cathode ray tube apparatus

Country Status (1)

Country Link
JP (1) JPS57113545A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61211940A (en) * 1985-03-15 1986-09-20 Sony Corp Permanent magnet for electron lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61211940A (en) * 1985-03-15 1986-09-20 Sony Corp Permanent magnet for electron lens

Also Published As

Publication number Publication date
JPH0217905B2 (en) 1990-04-23

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