JPS57191943A - Cathode-ray tube of magnetic focusing type - Google Patents

Cathode-ray tube of magnetic focusing type

Info

Publication number
JPS57191943A
JPS57191943A JP7573981A JP7573981A JPS57191943A JP S57191943 A JPS57191943 A JP S57191943A JP 7573981 A JP7573981 A JP 7573981A JP 7573981 A JP7573981 A JP 7573981A JP S57191943 A JPS57191943 A JP S57191943A
Authority
JP
Japan
Prior art keywords
magnetic field
magnetic
cathode
ray tube
permanent magnet
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
JP7573981A
Other languages
Japanese (ja)
Other versions
JPH0319663B2 (en
Inventor
Taketoshi Shimoma
Kumio Fukuda
Toshio Shimaougi
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP7573981A priority Critical patent/JPS57191943A/en
Publication of JPS57191943A publication Critical patent/JPS57191943A/en
Publication of JPH0319663B2 publication Critical patent/JPH0319663B2/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 obtain a cathode-ray tube of a magnetic focusing type, wherein the cathode-ray tube provides excellent focusing characteristics and makes focus- adjusting possible. CONSTITUTION:A magnetic adjuster which is at least partially cylindrical, made of ferromagnetic material and composed of a plurality of magnetic field rectifying elements, is provided within a neck 30, the adjuster being located oppositely to a permanent magnet 31 arranged outside the neck 30 of a cathode-ray tube. The magnetic adjsuter comprises first, second and third magnetic field rectifying elements 32, 33 and 34; the magnetic field intensity becomes maximum between the first and second magnetic field rectifying elements 32 and 33, whereas two of the focusing lenses are formed in the peak position of both the magnetic fields equivalently. As the permanent magnet 31 moves, the magnetic field distribution changes; the magnetic field peak becomes greater as the center of the permanent magnet 31 approaches, whereas the peak is in turn reduced as the magnet 31 departs. Accordingly, the distance from the target can be made equivalently larger or smaller and thus focus-adjusting becomes possible.
JP7573981A 1981-05-21 1981-05-21 Cathode-ray tube of magnetic focusing type Granted JPS57191943A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7573981A JPS57191943A (en) 1981-05-21 1981-05-21 Cathode-ray tube of magnetic focusing type

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7573981A JPS57191943A (en) 1981-05-21 1981-05-21 Cathode-ray tube of magnetic focusing type

Publications (2)

Publication Number Publication Date
JPS57191943A true JPS57191943A (en) 1982-11-25
JPH0319663B2 JPH0319663B2 (en) 1991-03-15

Family

ID=13584944

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7573981A Granted JPS57191943A (en) 1981-05-21 1981-05-21 Cathode-ray tube of magnetic focusing type

Country Status (1)

Country Link
JP (1) JPS57191943A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715348A (en) * 1980-07-02 1982-01-26 Hitachi Ltd Electromagnetic focusing cathode ray tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5715348A (en) * 1980-07-02 1982-01-26 Hitachi Ltd Electromagnetic focusing cathode ray tube

Also Published As

Publication number Publication date
JPH0319663B2 (en) 1991-03-15

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