JPS5593640A - Electron beam focussing device - Google Patents
Electron beam focussing deviceInfo
- Publication number
- JPS5593640A JPS5593640A JP159479A JP159479A JPS5593640A JP S5593640 A JPS5593640 A JP S5593640A JP 159479 A JP159479 A JP 159479A JP 159479 A JP159479 A JP 159479A JP S5593640 A JPS5593640 A JP S5593640A
- Authority
- JP
- Japan
- Prior art keywords
- electron beam
- beam spot
- horizontal
- scanning direction
- shape
- 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.)
- Granted
Links
Landscapes
- Video Image Reproduction Devices For Color Tv Systems (AREA)
- Details Of Television Scanning (AREA)
Abstract
PURPOSE: To increase the brightness of a peripheral section and improve the horizontal resolution by vertically lengthening the shape of a beam spot and always minimizing the horizontal width on the reproduced surface of the electron beam image.
CONSTITUTION: The controlled magnetic field generator 8 generating magnetic fluxes on the plane (x-y) which is vertical to the electron beam procession direction z is provided between the cathode 1 and the focussing coil 2 as a focussing lens system. It 8 consists of a 4-pole core and a winding around which this 4-pole core is wound. This permits the shape of the electron beam spot to be made round in the center of the reproduced surface of the electron beam and it to be lengthened in the vertical scanning direction in a peripheral section. The beam spot width in the horizontal scanning direction is always minimized.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP159479A JPS5593640A (en) | 1979-01-10 | 1979-01-10 | Electron beam focussing device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP159479A JPS5593640A (en) | 1979-01-10 | 1979-01-10 | Electron beam focussing device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5593640A true JPS5593640A (en) | 1980-07-16 |
JPS6325456B2 JPS6325456B2 (en) | 1988-05-25 |
Family
ID=11505826
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP159479A Granted JPS5593640A (en) | 1979-01-10 | 1979-01-10 | Electron beam focussing device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5593640A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57174833A (en) * | 1981-04-20 | 1982-10-27 | Matsushita Electronics Corp | Cathode ray tube |
JPS60246182A (en) * | 1984-05-21 | 1985-12-05 | Matsushita Electric Ind Co Ltd | Picture display device |
-
1979
- 1979-01-10 JP JP159479A patent/JPS5593640A/en active Granted
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57174833A (en) * | 1981-04-20 | 1982-10-27 | Matsushita Electronics Corp | Cathode ray tube |
JPH021345B2 (en) * | 1981-04-20 | 1990-01-11 | Matsushita Electronics Corp | |
JPS60246182A (en) * | 1984-05-21 | 1985-12-05 | Matsushita Electric Ind Co Ltd | Picture display device |
Also Published As
Publication number | Publication date |
---|---|
JPS6325456B2 (en) | 1988-05-25 |
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