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

H - Electricity

01

J

313/35.32

H01J 29/48 (2006.01) H01J 29/51 (2006.01)

Patent

CA 1138518

RCA 73,250 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-to-5 times its depth, creates an astiomatic 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.

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