JPS575247A - Electromagnetic focusing cathode ray tube - Google Patents

Electromagnetic focusing cathode ray tube

Info

Publication number
JPS575247A
JPS575247A JP7772980A JP7772980A JPS575247A JP S575247 A JPS575247 A JP S575247A JP 7772980 A JP7772980 A JP 7772980A JP 7772980 A JP7772980 A JP 7772980A JP S575247 A JPS575247 A JP S575247A
Authority
JP
Japan
Prior art keywords
electron beam
distance
main lens
sections
ray tube
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
JP7772980A
Other languages
Japanese (ja)
Inventor
Kyohei Fukuda
Kuniharu Osakabe
Soichi Sakurai
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 JP7772980A priority Critical patent/JPS575247A/en
Publication of JPS575247A publication Critical patent/JPS575247A/en
Pending 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 release the shifting of STC(where the electron beam is not focused at one point.) by bringing the ratio of the distance between the center of the outside electron beam pass hole and the tube axis and the facing distance between the main lens forming electrodes into specific range. CONSTITUTION:The electrodes 3a, 3b for forming the electrostatic main lens of an inline integrated electron gun are made of magnetic member while a permanent magnet 1 is located at the neck section to form a magnetic main lens between facing planar sections 2a, 2b. Electron beam pass holes 20-22 are formed with distance (s) at said sections 2a, 2b. Assuming the facing distance at said sections 2a, 2b is Lg, the value of (s) should be set to satisfy 0.5s<Lg<2.5s. Consequently three electron beam can be focused to one point under nondeflection.
JP7772980A 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube Pending JPS575247A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7772980A JPS575247A (en) 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7772980A JPS575247A (en) 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube

Publications (1)

Publication Number Publication Date
JPS575247A true JPS575247A (en) 1982-01-12

Family

ID=13641981

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7772980A Pending JPS575247A (en) 1980-06-11 1980-06-11 Electromagnetic focusing cathode ray tube

Country Status (1)

Country Link
JP (1) JPS575247A (en)

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