Cathode ray tube with spherical aberration correction means

Details Cathode ray tube with spherical aberration correction means Cathode ray tube with spherical aberration correction means

1983-01-17

1986-01-28

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Ray generating or control

313414, 313458, 313293, H01J 2956

Patent

active

045673993

ABSTRACT:
A curved, electrically-conductive foil or gauze member is provided in a second cylindrical accelerating electrode of an electron gun for a cathode ray tube. The curvature of the foil or gauze member initially decreases with distance from the longitudinal axis of the electrode, thereby modifying the shape of the field produced by the electrode and minimizing spherical aberration. The curvature preferably varies according to a zero order Bessel function. Spherical aberration can be made negative by adjusting the relative positions of the member and nearby ends of the second and an adjacent first cylindrical accelerating electrode.

REFERENCES:
patent: 2223040 (1940-11-01), Mahl
patent: 3376447 (1968-04-01), Petit

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