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JPS5663749A - Electron gun - Google Patents

Electron gun

Info

Publication number
JPS5663749A
JPS5663749A JP12934780A JP12934780A JPS5663749A JP S5663749 A JPS5663749 A JP S5663749A JP 12934780 A JP12934780 A JP 12934780A JP 12934780 A JP12934780 A JP 12934780A JP S5663749 A JPS5663749 A JP S5663749A
Authority
JP
Japan
Prior art keywords
electrodes
lens
electrode
electron gun
length
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
JP12934780A
Other languages
Japanese (ja)
Other versions
JPS6117333B2 (en
Inventor
Eiichi Yamazaki
Hiromi Kanai
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 JP12934780A priority Critical patent/JPS5663749A/en
Publication of JPS5663749A publication Critical patent/JPS5663749A/en
Publication of JPS6117333B2 publication Critical patent/JPS6117333B2/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
    • H01J29/62—Electrostatic lenses
    • H01J29/622—Electrostatic lenses producing fields exhibiting symmetry of revolution
    • H01J29/624—Electrostatic lenses producing fields exhibiting symmetry of revolution co-operating with or closely associated to an electron gun

Abstract

PURPOSE:To lower the aberration of an electron gun and also to improve its resolution, by forming at least one of its electrodes different in length from remaining electrodes and also forming its main lens from a combination of a unipotential type lens and a bipotential type lens. CONSTITUTION:A main lens Lm is constituted by four electrodes P1-P4 arranged on a common axis. Among the electrodes, the electrodes P1, P4 are disposed respectively at the stem and face sides of a cathode ray tube. The electrodes P1, P3 are each connected to a high voltage source Ea, while the electrodes P2, P4 are each connected to a medium voltage source Eb. By such an arrangement, a unipotential type lens Lu is formed by the electrodes P1-P3 whereas a bipotential type lens Lb is constituted by the electrodes P3, P4. These two lenses form apparently a single large-diameter lens Lm. The electrode length (i.e., the length of an electrode portion which is parallel to the axis of a cathode tube) of the electrode P2 is made different from that of the electrode P4 to which the same voltage Eb is applied. Owing to the above constitution, it is possible to lower the aberration of the lens of an electron gun and simultaneously to improve its resolution.
JP12934780A 1980-09-19 1980-09-19 Electron gun Granted JPS5663749A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12934780A JPS5663749A (en) 1980-09-19 1980-09-19 Electron gun

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12934780A JPS5663749A (en) 1980-09-19 1980-09-19 Electron gun

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP46004232A Division JPS5743972B1 (en) 1971-02-05 1971-02-05

Publications (2)

Publication Number Publication Date
JPS5663749A true JPS5663749A (en) 1981-05-30
JPS6117333B2 JPS6117333B2 (en) 1986-05-07

Family

ID=15007357

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12934780A Granted JPS5663749A (en) 1980-09-19 1980-09-19 Electron gun

Country Status (1)

Country Link
JP (1) JPS5663749A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE25127E (en) * 1962-02-20 Cathode-ray tube

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE25127E (en) * 1962-02-20 Cathode-ray tube

Also Published As

Publication number Publication date
JPS6117333B2 (en) 1986-05-07

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