Electric lamp and discharge devices: systems – Cathode ray tube circuits – Plural concentrating – accelerating – and/or de-accelerating...
Patent
1987-02-13
1988-03-01
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
047288582
ABSTRACT:
A color cathode ray tube apparatus having an electron gun assembly including a device for modulating a scanning velocity of electron beams at an auxiliary lens section for clarifying an image projected to a screen is disclosed. The color cathode ray tube apparatus comprises an enclosure having a panel section, a funnel section and a neck section, an electron gun assembly, including rear electrodes disposed in front of three cathodes for emitting electron beams, each having three through-holes for passing the beams for forming an auxiliary lens for preliminarily focusing the beams, and a front electrode located in front of the rear electrodes for forming a main lens in cooperation with one electrode thereof for further focusing the beams and converging the beams. The rear electrodes have a pair of electrode members having three beam through-holes defined by cylindrical projections, oblique surfaces opposed at a predetermined interval, formed of the cylindrical projections, each surface crossing perpendicularly to a horizontal plane for scanning the beams and having a predetermined angle with respect to a plane perpendicular to the axis of an electron beam path. The scanning velocity modulating device is connected with the pair of electrode members for supplying a modulating voltage thereto, when luminance values of a video signal arrive at a predetermined level.
REFERENCES:
patent: 4058753 (1977-11-01), Blacker et al.
patent: 4495439 (1985-01-01), Shimoma et al.
Fujiwara Takeshi
Koshigoe Shinpei
Blum Theodore M.
Kabushiki Kaisha Toshiba
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