Cathode ray tube

Details Cathode ray tube Cathode ray tube

1984-05-14

1986-11-25

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313409, H01J 2950

Patent

active

046251464

ABSTRACT:
A cathode ray tube comprising in an evacuated envelope (1) an electron gun system (5,104) for generating at least one electron beam (6,7,8,105) which is focused on a target (10,108) by means of at least one accelerating electron lens (22,23,50,51). The lens viewed in the direction of propagation of the electron beam, comprises a first (22,50) and a second (23,51) electrode separated by a lens gap (30,53). In the second electrode is an electrically conductive foil or gauze (31,52) intersects the beam at a distance from the lens gap. When the foil or gauze is flat and is provided at such a location that 0.25<l/R<2.0, where l is the distance from the foil or gauze to the lens gap and R is the radius of the part of the second electrode in which or against which the foil or gauze is provided. The spherical aberration in the electron beam is drastically reduced. Such a flat gauze moreover is easy to manufacture and assemble in an electron gun.

REFERENCES:
patent: 2220839 (1940-11-01), Hahn
patent: 3735178 (1973-05-01), Peper
patent: 4330708 (1982-05-01), Meisburger
patent: 4370592 (1983-01-01), Hughes et al.
patent: 4371808 (1983-02-01), Urano et al.

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