GB1279524A - Cathode ray tube video display system - Google Patents
Cathode ray tube video display systemInfo
- 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
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
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
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.
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)
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 |
-
1970
- 1970-06-30 GB GB3176070A patent/GB1279524A/en not_active Expired
Cited By (2)
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 |