Electron gun with astigmatic flare-reducing beam forming region

Details Electron gun with astigmatic flare-reducing beam forming region Electron gun with astigmatic flare-reducing beam forming region

1978-09-25

1980-11-18

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313414, 313449, H01J 2950, H01J 2956

Patent

active

042348145

ABSTRACT:
The gun, for use in a television picture tube, comprises a cathode, an apertured control grid, and an apertured screen grid aligned in the order named. The screen grid aperture comprises a rectangular slot portion facing the control grid and a circular portion facing away from the control grid. The slot portion of the aperture, which has a width 2-5 times its depth, creates an astigmatic field that produces underconvergence of the electron beam in the vertical plane only, whereby to avoid and/or compensate for vertical flare distortion of the beam spot at off-center positions on the image screen.

REFERENCES:
patent: 3852608 (1974-12-01), Johanns et al.
patent: 3866081 (1975-02-01), Hasker et al.
patent: 3919583 (1975-11-01), Hasker et al.
patent: 3952224 (1976-04-01), Evans, Jr.
patent: 3970890 (1976-07-01), Linssen
patent: 4143293 (1979-03-01), Hosokoshi et al.

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