JPS56112053A - Focus magnet device for cathode ray tube - Google Patents

Focus magnet device for cathode ray tube

Info

Publication number
JPS56112053A
JPS56112053A JP1623180A JP1623180A JPS56112053A JP S56112053 A JPS56112053 A JP S56112053A JP 1623180 A JP1623180 A JP 1623180A JP 1623180 A JP1623180 A JP 1623180A JP S56112053 A JPS56112053 A JP S56112053A
Authority
JP
Japan
Prior art keywords
flux
leakage flux
ray tube
cathode ray
section
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
JP1623180A
Other languages
Japanese (ja)
Other versions
JPS6332217B2 (en
Inventor
Takeo Fujimura
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1623180A priority Critical patent/JPS56112053A/en
Publication of JPS56112053A publication Critical patent/JPS56112053A/en
Publication of JPS6332217B2 publication Critical patent/JPS6332217B2/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 stabilize the flux to be contributed for the focusing, by providing a movable shunt section in a portion of leakage flux path while constituting the device such that the leakage flux passing through said movable shunt section will decrease in accordance with the temperature rise. CONSTITUTION:As the temperature rises the force of a permanent magnet 1 is weakened to reduce the flux to be produced. At the same time the extended section 213 of a magnetic path member 200 will bend toward outside due to the temperature characteristic of a bimetal because it isn't fixed to a cover 20. Consequently the magnetic resistance in a magnetic path for leakage flux 5 passing through the extended section 213 is increased to reduce the leakage flux 5 thus to compensate the reduction of flux produced in a cavity 2 due to the temperature rise.
JP1623180A 1980-02-12 1980-02-12 Focus magnet device for cathode ray tube Granted JPS56112053A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1623180A JPS56112053A (en) 1980-02-12 1980-02-12 Focus magnet device for cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1623180A JPS56112053A (en) 1980-02-12 1980-02-12 Focus magnet device for cathode ray tube

Publications (2)

Publication Number Publication Date
JPS56112053A true JPS56112053A (en) 1981-09-04
JPS6332217B2 JPS6332217B2 (en) 1988-06-29

Family

ID=11910768

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1623180A Granted JPS56112053A (en) 1980-02-12 1980-02-12 Focus magnet device for cathode ray tube

Country Status (1)

Country Link
JP (1) JPS56112053A (en)

Also Published As

Publication number Publication date
JPS6332217B2 (en) 1988-06-29

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