Cathode-ray tube

Details Cathode-ray tube Cathode-ray tube

1983-10-21

1986-10-28

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

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

313414, 313449, H01J 2946, H01J 2956

Patent

active

046201343

ABSTRACT:
The spot quality of an electron beam produced by an electron gun in a cathode ray tube is improved by optimizing the dimensions of a beam-forming, apertured electrode arrangement in the gun. This arrangement includes electrodes for forming a cross-over followed by, in the direction of propagation of the electron beam, first and second lens electrodes centered around an axis, for defining an accelerating and prefocusing lens and at least two lens electrodes for defining a main focusing lens. The diameter of the aperture in the second lens electrode is smaller than twice the diameter of the aperture in the first lens electrode, and the effective spacing S-eff between the first and the second lens electrodes is smaller than 1 mm. S-eff is defined as the minimum of the function ##EQU1## where .DELTA.V is the operating voltage difference between the second and first lens electrodes and

REFERENCES:
patent: 3437868 (1969-04-01), Ohkoshi et al.
patent: 4287450 (1981-09-01), Kawakami et al.
patent: 4481445 (1984-11-01), Gorski
patent: 4496877 (1985-01-01), Kueny

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