JPS57170442A - Electron gun for crt - Google Patents

Electron gun for crt

Info

Publication number
JPS57170442A
JPS57170442A JP5438381A JP5438381A JPS57170442A JP S57170442 A JPS57170442 A JP S57170442A JP 5438381 A JP5438381 A JP 5438381A JP 5438381 A JP5438381 A JP 5438381A JP S57170442 A JPS57170442 A JP S57170442A
Authority
JP
Japan
Prior art keywords
cathode
electrode
projection
voltage
grid
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
JP5438381A
Other languages
Japanese (ja)
Inventor
Yoji Ogawa
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP5438381A priority Critical patent/JPS57170442A/en
Publication of JPS57170442A publication Critical patent/JPS57170442A/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
    • H01J29/48—Electron guns
    • H01J29/488—Schematic arrangements of the electrodes for beam forming; Place and form of the elecrodes

Abstract

PURPOSE:To suppress an increase of crossover under a large current by providing a projection with a cathode material layer on the cathode and providing at its side a plate-like Wehnelt electrode with a small hole. CONSTITUTION:A projection 22 is formed on a cathode 21, and a cathode material layer is coated on the edge of the projection 22. A plate-like Wehnelt electrode 23 with a small hole is arranged on the side of the cathode projection 22, and a voltage which is lower than that of the cathode 21 by several volts to tens volts is applied to the electrode 23. The first, second, third grid electrodes 24, 25, 26 are arranged by being separated from each other; the first grid electrodes 24 is applied with a voltage which is equal to or higher than that of the Wehnelt electrode 23 by tens volts, and the second and the third grid electrode 25, 26 are applied with a normal voltage. An electron beam is modulated by the cathode 21 or the first grid electrode 24. Thereby, the distortion of the electric field is reduced, and an increase of the crossover diameter under a large current can be suppressed.
JP5438381A 1981-04-13 1981-04-13 Electron gun for crt Pending JPS57170442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5438381A JPS57170442A (en) 1981-04-13 1981-04-13 Electron gun for crt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5438381A JPS57170442A (en) 1981-04-13 1981-04-13 Electron gun for crt

Publications (1)

Publication Number Publication Date
JPS57170442A true JPS57170442A (en) 1982-10-20

Family

ID=12969156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5438381A Pending JPS57170442A (en) 1981-04-13 1981-04-13 Electron gun for crt

Country Status (1)

Country Link
JP (1) JPS57170442A (en)

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