JPS5539121A - Electromagnetic focus cathode ray tube - Google Patents

Electromagnetic focus cathode ray tube

Info

Publication number
JPS5539121A
JPS5539121A JP11171378A JP11171378A JPS5539121A JP S5539121 A JPS5539121 A JP S5539121A JP 11171378 A JP11171378 A JP 11171378A JP 11171378 A JP11171378 A JP 11171378A JP S5539121 A JPS5539121 A JP S5539121A
Authority
JP
Japan
Prior art keywords
permanent magnet
magnetic field
cathode ray
ray tube
surrounding unit
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.)
Pending
Application number
JP11171378A
Other languages
Japanese (ja)
Inventor
Kyohei Fukuda
Soichi Sakurai
Hirobumi Oota
Masanobu Takada
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Ltd filed Critical Hitachi Ltd
Priority to JP11171378A priority Critical patent/JPS5539121A/en
Publication of JPS5539121A publication Critical patent/JPS5539121A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To reproduce the picture of high resolution, with a uniformly focusing magnetic field provided, by placing a focusing field generating permanent magnet, provided in a neck portion within the cathode ray tube, in a location within the surrounding unit of high permeability material.
CONSTITUTION: In the inside of both end faces of a cylindrical surrounding unit 10 of high permeability material, having a hole 13 for an electron beam to pass, is provided a permanent magnet 11. The permanent magnet 11 is magnetized in the direction axially of the tube neck part, that is, almost in parallel to a passing direction of the electron beam, with a magnetic field Bg generated in the interior of the surrounding unit 10. At this time, a magnetic adjuster plate 12 equalizes a dispersal of magnetization state of the perrmanent magnet 11, to provide a uniformity of distribution of the magnetic field.
COPYRIGHT: (C)1980,JPO&Japio
JP11171378A 1978-09-13 1978-09-13 Electromagnetic focus cathode ray tube Pending JPS5539121A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11171378A JPS5539121A (en) 1978-09-13 1978-09-13 Electromagnetic focus cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11171378A JPS5539121A (en) 1978-09-13 1978-09-13 Electromagnetic focus cathode ray tube

Publications (1)

Publication Number Publication Date
JPS5539121A true JPS5539121A (en) 1980-03-18

Family

ID=14568266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11171378A Pending JPS5539121A (en) 1978-09-13 1978-09-13 Electromagnetic focus cathode ray tube

Country Status (1)

Country Link
JP (1) JPS5539121A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439710A (en) * 1980-07-02 1984-03-27 Hitachi, Ltd. Electromagnetic focusing cathode-ray tube

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4439710A (en) * 1980-07-02 1984-03-27 Hitachi, Ltd. Electromagnetic focusing cathode-ray tube

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