JPS55157844A - Focusing magnet - Google Patents

Focusing magnet

Info

Publication number
JPS55157844A
JPS55157844A JP6577579A JP6577579A JPS55157844A JP S55157844 A JPS55157844 A JP S55157844A JP 6577579 A JP6577579 A JP 6577579A JP 6577579 A JP6577579 A JP 6577579A JP S55157844 A JPS55157844 A JP S55157844A
Authority
JP
Japan
Prior art keywords
outer diameter
permanent magnet
magnet
magnetic field
lightweight
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
JP6577579A
Other languages
Japanese (ja)
Other versions
JPH0138350B2 (en
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 JP6577579A priority Critical patent/JPS55157844A/en
Publication of JPS55157844A publication Critical patent/JPS55157844A/en
Publication of JPH0138350B2 publication Critical patent/JPH0138350B2/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 obtain a focusing magnet which is of a small-size and lightweight and has little outside leakage magnetic field by setting the ratio of the outer diameter of a yoke plate to the outer diameter of a permanent magnet within a specific range. CONSTITUTION:The yoke plates 1 and 2 each of which has the passing-through hole for the neck 5 of a cathode-ray tube at the cener and has the outer diameter C1 smaller than the outer diameter D2 of a permanent magnet are fixed on the same axis to the center of the passing-through hole part of the neck 5 of the magnet 3 at both ends of a ring-shaped permanent magnet 3. It is necessary for the center magnetic field X to be within a prescribed range obtained from the outer diamter D1 of the yoke plates 1 and 2 and the outer diameter D2 of the permanent magnet 3, and for this purpose, the ratio of D1/D2 is set within 0.8-0.99. Thus, a focusing magnet which is of a small-size and lightweight and has little outside leakage magnetic field can be obtained.
JP6577579A 1979-05-28 1979-05-28 Focusing magnet Granted JPS55157844A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6577579A JPS55157844A (en) 1979-05-28 1979-05-28 Focusing magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6577579A JPS55157844A (en) 1979-05-28 1979-05-28 Focusing magnet

Publications (2)

Publication Number Publication Date
JPS55157844A true JPS55157844A (en) 1980-12-08
JPH0138350B2 JPH0138350B2 (en) 1989-08-14

Family

ID=13296736

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6577579A Granted JPS55157844A (en) 1979-05-28 1979-05-28 Focusing magnet

Country Status (1)

Country Link
JP (1) JPS55157844A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007189910A (en) * 2006-01-17 2007-08-02 Shimizu Corp Greening unit and greening system provided with the greening unit

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5026274U (en) * 1973-07-03 1975-03-26

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5026274U (en) * 1973-07-03 1975-03-26

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007189910A (en) * 2006-01-17 2007-08-02 Shimizu Corp Greening unit and greening system provided with the greening unit

Also Published As

Publication number Publication date
JPH0138350B2 (en) 1989-08-14

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