JPS55166850A - Focus magnet - Google Patents

Focus magnet

Info

Publication number
JPS55166850A
JPS55166850A JP7526579A JP7526579A JPS55166850A JP S55166850 A JPS55166850 A JP S55166850A JP 7526579 A JP7526579 A JP 7526579A JP 7526579 A JP7526579 A JP 7526579A JP S55166850 A JPS55166850 A JP S55166850A
Authority
JP
Japan
Prior art keywords
ring
shaped permanent
poles
axial direction
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
JP7526579A
Other languages
Japanese (ja)
Other versions
JPH0138352B2 (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 JP7526579A priority Critical patent/JPS55166850A/en
Publication of JPS55166850A publication Critical patent/JPS55166850A/en
Publication of JPH0138352B2 publication Critical patent/JPH0138352B2/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

Abstract

PURPOSE:To shorten a focal length and satisfy various characteristics by arranging a ring-shaped permanent magnet through a yoke plate. CONSTITUTION:The yoke plates 1a and 1b which have the neck holes of a CRT at the center are inserted in the axial direction of the ring-shaped permanent magnet 2 which has the poles N and S in the processing direction of electron beams and the ring-shaped permanent magnets 3a and 3b which have the poles N and S in the axial direction are secured in the yoke plates 1a and 1b. Besides, the coils 4a and 4b are provided on the external surfaces of the permanent magnets 3a and 3b, respectively.
JP7526579A 1979-06-15 1979-06-15 Focus magnet Granted JPS55166850A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7526579A JPS55166850A (en) 1979-06-15 1979-06-15 Focus magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7526579A JPS55166850A (en) 1979-06-15 1979-06-15 Focus magnet

Publications (2)

Publication Number Publication Date
JPS55166850A true JPS55166850A (en) 1980-12-26
JPH0138352B2 JPH0138352B2 (en) 1989-08-14

Family

ID=13571211

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7526579A Granted JPS55166850A (en) 1979-06-15 1979-06-15 Focus magnet

Country Status (1)

Country Link
JP (1) JPS55166850A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494574A (en) * 1972-04-25 1974-01-16

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS494574A (en) * 1972-04-25 1974-01-16

Also Published As

Publication number Publication date
JPH0138352B2 (en) 1989-08-14

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