Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1992-12-17
1995-02-28
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313412, 313432, 313439, 313460, 31530815, 315 15, 315382, H01J 2951
Patent
active
053940539
ABSTRACT:
An electron gun for a color cathode ray tube having sequentially formed a cathode, a control electrode, a screen electrode, a focus electrode and a final accelerating electrode, wherein the focus electrode is constituted by first and second focus electrodes. The first focus electrode includes an evenly formed electron beam inlet plane and an electron beam outlet plane in which a portion for shaping a central electron beam passing hole is formed convexly in respect to portions for shaping outer electron beam passing holes, while the second focus electrode comprises an evenly formed electron beam outlet plane and an electron beam inlet plane in which a portion for shaping a central electron beam passing hole is formed concavely in respect to portions for shaping outer electron beam passing holes. The quadruple lens formed between outer electron beam passing holes is formed asymmetrically, to improve the convergence characteristic.
REFERENCES:
patent: 4737682 (1988-04-01), Alig et al.
patent: 4772827 (1988-09-01), Osakabe
patent: 4825120 (1989-04-01), Takahashi
patent: 4967120 (1990-10-01), Katsuma et al.
patent: 5142190 (1992-08-01), Kon
patent: 5212423 (1993-05-01), Niguchi et al.
Patel Ashok
Samsung Electron Devices
Yusko Donald J.
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