JPS55121254A - Focusing lens of electron gun for cathode-ray tube - Google Patents

Focusing lens of electron gun for cathode-ray tube

Info

Publication number
JPS55121254A
JPS55121254A JP2786179A JP2786179A JPS55121254A JP S55121254 A JPS55121254 A JP S55121254A JP 2786179 A JP2786179 A JP 2786179A JP 2786179 A JP2786179 A JP 2786179A JP S55121254 A JPS55121254 A JP S55121254A
Authority
JP
Japan
Prior art keywords
grid
lens
cathode
focusing lens
bipotential
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
JP2786179A
Other languages
Japanese (ja)
Inventor
Masaya Takenobu
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP2786179A priority Critical patent/JPS55121254A/en
Publication of JPS55121254A publication Critical patent/JPS55121254A/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
    • H01J29/62—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 widely suppress an aberration of the lens and enable a beam spot to be made small in diameter, by setting a virtual object point of the electron beam incident upon a decelerating bipotential lens to a specific position. CONSTITUTION:On a central axis S of the electron gun, are arranged a cathode K and the first grid 1-sixth grid 6. The third grid 3-sixth grid 6 are constituting a front stage focusing lens Lf in the rear stage of which a focusing lens L is arranged. An accelerating bipotential lens is constructed by a first accelerating bipotential lens constituted by between the third grid 3 and the fourth grid 4 and the second accelerating bipotential lens constituted by between the fifth grid 5 and the sixth grid 6. A virtual object point of the electron beam incident upon a decelerating bipotential lens is set to a position of (focal length at object side)-(focal length at image side).
JP2786179A 1979-03-09 1979-03-09 Focusing lens of electron gun for cathode-ray tube Pending JPS55121254A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2786179A JPS55121254A (en) 1979-03-09 1979-03-09 Focusing lens of electron gun for cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2786179A JPS55121254A (en) 1979-03-09 1979-03-09 Focusing lens of electron gun for cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS55121254A true JPS55121254A (en) 1980-09-18

Family

ID=12232684

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2786179A Pending JPS55121254A (en) 1979-03-09 1979-03-09 Focusing lens of electron gun for cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS55121254A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4363996A (en) * 1979-12-19 1982-12-14 Hitachi, Ltd. Vidicon type camera tube
US4560899A (en) * 1981-12-16 1985-12-24 Hitachi, Ltd. Electron beam focusing lens
KR100863947B1 (en) * 2001-10-17 2008-10-16 삼성에스디아이 주식회사 Electron gun for cathode ray tube
KR100863946B1 (en) * 2001-10-15 2008-10-16 삼성에스디아이 주식회사 Electron gun for cathode ray tube

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4363996A (en) * 1979-12-19 1982-12-14 Hitachi, Ltd. Vidicon type camera tube
US4560899A (en) * 1981-12-16 1985-12-24 Hitachi, Ltd. Electron beam focusing lens
KR100863946B1 (en) * 2001-10-15 2008-10-16 삼성에스디아이 주식회사 Electron gun for cathode ray tube
KR100863947B1 (en) * 2001-10-17 2008-10-16 삼성에스디아이 주식회사 Electron gun for cathode ray tube

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