Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1987-03-18
1988-06-28
DeMeo, Palmer C.
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
313440, 313477R, 335213, H01J 2976, H01J 2986
Patent
active
047541903
ABSTRACT:
A flat cathode-ray tube has a tubular glass body comprising a tubular neck portion, a flat funnel portion, a flat box-shaped head portion, an electron gun housed in the neck portion, and a fluorescent screen at the head portion. At least the funnel portion is made entirely of a flat glass plate. A deflection yoke, mounted on the junction of the neck and funnel portions, comprises a core having at its funnel-side end an opening approximately rectangular with substantially straight upper and lower sides and gently outwardly bulging arcuate opposite lateral sides. The core's inner surface, defining an opening, is continuously reducing in size from the funnel side toward the neck portion conforming with the tapered shape of the funnel portion. The yoke further comprises a pair of vertical deflection coils wound around an upper and a lower portion of the core. A pair of horizontal deflection coils, each have horizontal portions extending at least along the opposite sides of the funnel portion. A front-end bridge portion extends from the horizontal portion approximately perpendicular thereto and is positioned on the upper or bottom surface of the funnel portion in a direction perpendicular to the electron beam. The horizontal deflection coils are arranged inside the core at opposite sides symmetrically with respect to a horizontal plane of passage of the beam. At least the horizontal deflection coils have their inner surfaces intimately contacted with the outer surface of the funnel portion.
REFERENCES:
patent: 2240606 (1941-05-01), Bobb
patent: 2842711 (1958-07-01), Frenkel
patent: 3192432 (1965-06-01), Nero
Hamagishi Goro
Hinotami Katsuhiro
Kishimoto Shunichi
Miyazaki Masahiko
Yoshiyama Shinji
DeMeo Palmer C.
Sanyo Electric Co,. Ltd.
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