JPS57163954A - Cathode-ray tube - Google Patents

Cathode-ray tube

Info

Publication number
JPS57163954A
JPS57163954A JP4842681A JP4842681A JPS57163954A JP S57163954 A JPS57163954 A JP S57163954A JP 4842681 A JP4842681 A JP 4842681A JP 4842681 A JP4842681 A JP 4842681A JP S57163954 A JPS57163954 A JP S57163954A
Authority
JP
Japan
Prior art keywords
electron
electrode
concentration
degree
grid electrode
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
JP4842681A
Other languages
Japanese (ja)
Inventor
Kumio Fukuda
Toshio Shimaougi
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 JP4842681A priority Critical patent/JPS57163954A/en
Publication of JPS57163954A publication Critical patent/JPS57163954A/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
    • H01J29/51—Arrangements for controlling convergence of a plurality of beams by means of electric field only

Abstract

PURPOSE:To make the correction of the degree of the concentration of electron beams variable by carrying out the concentration of the electron beams by installing an auxiliary electrode surrounding electron beam paths between a third and a fourth grid electrode, which constitute the main lens of a three-electron- beam gun. CONSTITUTION:An auxiliary electrode 53, which has an opening 531 surrounding electron-beam passing holes 41R, 41G and 41B, is placed between a third grid electrode 47 and a fourth grid electrode 48, which constitute the main lens of a three-electron-beam gun. The auxiliary electrode 53 and the third grid electrode 47 are made to have the same electric potential. The degree of the concentration of the three electron beams is controlled by changing the distance X between the electrodes 53 and 47, as well as the thickness of the electrode 53. By the means mentioned above, since the degree of the concentration can be controlled only by altering the form of the electrode 53, the most suitable concentration can be realized by using the same electron gun irrespective of the size of a cathode-ray tube.
JP4842681A 1981-04-02 1981-04-02 Cathode-ray tube Pending JPS57163954A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4842681A JPS57163954A (en) 1981-04-02 1981-04-02 Cathode-ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4842681A JPS57163954A (en) 1981-04-02 1981-04-02 Cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS57163954A true JPS57163954A (en) 1982-10-08

Family

ID=12803004

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4842681A Pending JPS57163954A (en) 1981-04-02 1981-04-02 Cathode-ray tube

Country Status (1)

Country Link
JP (1) JPS57163954A (en)

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