GB1279524A - Cathode ray tube video display system - Google Patents

Cathode ray tube video display system

Info

Publication number
GB1279524A
GB1279524A GB3176070A GB3176070A GB1279524A GB 1279524 A GB1279524 A GB 1279524A GB 3176070 A GB3176070 A GB 3176070A GB 3176070 A GB3176070 A GB 3176070A GB 1279524 A GB1279524 A GB 1279524A
Authority
GB
United Kingdom
Prior art keywords
centre
lens
cathode
cathodes
supplied
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.)
Expired
Application number
GB3176070A
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.)
Sony Corp
Original Assignee
Sony 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 Sony Corp filed Critical Sony Corp
Publication of GB1279524A publication Critical patent/GB1279524A/en
Expired 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

1279524 Colour television tubes SONY CORP 30 June 1970 [30 June 1969] 31760/70 Heading H1D In a colour television tube of the type wherein three coplanar beams pass through the centre of a common focusing lens L, Fig. 4, the centre cathode is operated at a higher potential than the other two cathodes in order to compensate for the different focusing effect of the main lens L and the pre-focusing lens L<SP>1</SP> (if provided) on the outer beams and on the centre beam. In Fig. 4, the centre cathode K G is supplied from potentiometer 12 with a potential of about 400V, whereas the outer cathodes K R and K B are supplied with near zero potential from potentiometers 11 and 13; video signals are supplied to the cathodes at terminals t R , t B and t G . The pre-focusing lens L<SP>1</SP> converges the beams at the centre of the main lens L. In a modification, Fig. 5 (not shown), the outer cathodes are inclined to the axis to provide the convergence and the lens L<SP>1</SP> acts only as a prefocusing lens; each cathode is surrounded by its own G1 grid operated at substantially the same potential as its cathode.
GB3176070A 1969-06-30 1970-06-30 Cathode ray tube video display system Expired GB1279524A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5188969 1969-06-30

Publications (1)

Publication Number Publication Date
GB1279524A true GB1279524A (en) 1972-06-28

Family

ID=12899431

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3176070A Expired GB1279524A (en) 1969-06-30 1970-06-30 Cathode ray tube video display system

Country Status (1)

Country Link
GB (1) GB1279524A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603737A1 (en) * 1986-06-30 1988-03-11 Sony Corp ELECTRON CANON
US4922166A (en) * 1986-06-30 1990-05-01 Sony Corporation Electron gun for multigun cathode ray tube

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2603737A1 (en) * 1986-06-30 1988-03-11 Sony Corp ELECTRON CANON
US4922166A (en) * 1986-06-30 1990-05-01 Sony Corporation Electron gun for multigun cathode ray tube

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Legal Events

Date Code Title Description
PS Patent sealed
PE20 Patent expired after termination of 20 years