JPS57174836A - Mask focus type color picture tube - Google Patents

Mask focus type color picture tube

Info

Publication number
JPS57174836A
JPS57174836A JP5863581A JP5863581A JPS57174836A JP S57174836 A JPS57174836 A JP S57174836A JP 5863581 A JP5863581 A JP 5863581A JP 5863581 A JP5863581 A JP 5863581A JP S57174836 A JPS57174836 A JP S57174836A
Authority
JP
Japan
Prior art keywords
mask
opening
pitch
diameter
high voltage
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
JP5863581A
Other languages
Japanese (ja)
Inventor
Shigeo Takenaka
Eizaburo Hamano
Eiji Kanbara
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 JP5863581A priority Critical patent/JPS57174836A/en
Publication of JPS57174836A publication Critical patent/JPS57174836A/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
    • H01J29/80—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching
    • H01J29/81—Arrangements for controlling the ray or beam after passing the main deflection system, e.g. for post-acceleration or post-concentration, for colour switching using shadow masks

Landscapes

  • Electrodes For Cathode-Ray Tubes (AREA)

Abstract

PURPOSE:To elongate the electron beam by setting the diameter and the pitch of the phosphor substance stripe at the opening of a mask to be applied with low voltage more than predetermined times longer than those at the opening of the mask to be applied with high voltage. CONSTITUTION:The shadow mask is constituted with two masks 7, 8 then the relatively low voltage is applied on the mask 7 near to the screen 1 while the relatively high voltage is applied on the mask 8 near to the electron gun. Here the diameter and the pitch in the same direction with the phosphor substance stripe 13 at the opening 31 of the mask 7 to be applied with low voltage are set more than two times longer than the diameter and the pitch of the opening 30 to be applied with high voltage. Consequently the shape of the electron beam spot focused on the screen can be elongated in the direction of the phosphor substance direction without deteriorating the mechanical strength of the shadow mask, resulting in the reduction of the Moare effect.
JP5863581A 1981-04-20 1981-04-20 Mask focus type color picture tube Pending JPS57174836A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5863581A JPS57174836A (en) 1981-04-20 1981-04-20 Mask focus type color picture tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5863581A JPS57174836A (en) 1981-04-20 1981-04-20 Mask focus type color picture tube

Publications (1)

Publication Number Publication Date
JPS57174836A true JPS57174836A (en) 1982-10-27

Family

ID=13090038

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5863581A Pending JPS57174836A (en) 1981-04-20 1981-04-20 Mask focus type color picture tube

Country Status (1)

Country Link
JP (1) JPS57174836A (en)

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