Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1985-04-02
1989-05-23
Boudreau, Leo H.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313437, H01J 2956
Patent
active
048333646
ABSTRACT:
An electron gun for a color picture tube has at least a cathode, a control grid, an accelerating grid, a focus grid and an anode, each of which has three apertures aligned in line. The focus grid and the anode made of elongated plates serves as main lens electrodes, and the apertures of the focus grid and the anode constitute a main lens assembly. The three apertures of each of the elongated plates has a central aperture defined by two first curves arcuated outward, two side apertures each of which is defined by a second curve as an inner half arcuated inward and a third curve as an outer half arcuated outward, the first and second curves being less arcuated than the third curve. The three apertures are aligned such that the major axes thereof are parallel to a shorter axis of the elongated plate and are located at equal intervals. The three apertures are spaced apart from each other through corresponding bridge portions. The third curve of each of the two side apertures is apart from a corresponding end of the elongated plate along the longitudinal direction.
REFERENCES:
patent: 4301473 (1983-04-01), Endoh et al.
patent: 4542318 (1985-09-01), Say
patent: 4591755 (1986-05-01), Kornaker
patent: 4614894 (1986-09-01), Izumida
Izumida Yukihiro
Komoro Hidemasa
Majima Kazuo
Shirai Shoji
Yamaguchi Akio
Boudreau Leo H.
Hitachi , Ltd.
Pfund Charles E.
Wieder K.
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