Cathode ray tube apparatus having focusing grids with horizontal

Details Cathode ray tube apparatus having focusing grids with horizontal Cathode ray tube apparatus having focusing grids with horizontal

1985-10-17

1989-03-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

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

313414, 315382, H01J 2946

Patent

active

048146706

ABSTRACT:
The present invention relates to a cathode ray tube apparatus which can reduce an astigmatism caused from the deflection distortion by providing its focusing grid in two parts and producing a dynamic focusing lens of a quadrupole between the opposing faces of the two focusing grid parts. One focusing grid preferably has vertically disposed oblong through holes, while the other focusing grid preferably has one or more horizontally disposed oblong through holes.

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patent: 4725332 (1981-06-01), Ashizaki et al.
patent: 4728859 (1988-03-01), Natsuhara

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