Electron gun with deflection-synchronized astigmatic screen grid

Details Electron gun with deflection-synchronized astigmatic screen grid Electron gun with deflection-synchronized astigmatic screen grid

1980-06-30

1982-03-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Plural concentrating, accelerating, and/or de-accelerating...

313414, H01J 2946, H01J 2956

Patent

active

043191630

ABSTRACT:
An electron gun comprises an astigmatic beam forming means including a cathode, a control grid, a first screen grid electrode having a horizontally elongated rectangular aperture, and a second screen grid electrode having a circular aperture. In operation, the second screen grid is energized with a DC bias voltage and the control grid and first screen grid is energized with a DC bias superposed with a substantially parabolically shaped dynamic signal synchronized with either or both the horizontal and vertical deflection signals. Thus, the astigmatic optics of the beam forming means varies in strength in phase with the beam scan so as to provide optimum correction for flare distortion of the electron beam.

REFERENCES:
patent: 2884559 (1959-04-01), Cooper, Jr. et al.
patent: 2901661 (1959-08-01), Neuhauser
patent: 3919583 (1975-11-01), Hasker et al.
patent: 4143293 (1979-03-01), Hosokoshi et al.
patent: 4242613 (1980-12-01), Brambring et al.
"Focusing on the New Panasonic `Quintrix` Color TV Picture Tube" by David H. Carpenter, pp. 52 & 53 of Audio Video, Feb. 1974.

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