Electron gun with dynamic focus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jun 4, 1996
Grant Date -
N/A
app pub date -
Mar 11, 1993
filing date -
May 19, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An electron gun for a color cathode ray tube includes a triode having a cathode, a control electrode and a screen electrode for producing an electron beam, and first, second, third and fourth focus electrodes and a final accelerating electrode for accelerating and focusing the electron beam. A predetermined static focus voltage is supplied to the first and third focus electrodes, a dynamic focus voltage synchronized with a deflection signal is supplied to the second and fourth focus electrodes, and an anode voltage higher than the highest dynamic focus voltage is supplied to the final accelerating electrode. Thus, by means of a dynamic and axially symmetrical lens, astigmatism of the electron beam spot on the periphery of the screen is improved, thereby forming an almost circular beam spot. Due to the dynamic variation of intensity of the main lens, the spot size on the periphery of the screen approaches is the spot size on the center of the screen through adjustment of the focusing distance of the electron beam.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully