Electric lamp and discharge devices – Cathode ray tube – Plural beam generating or control
Patent
1996-05-08
1998-04-14
O'Shea, Sandra L.
Electric lamp and discharge devices
Cathode ray tube
Plural beam generating or control
313414, 313458, H01J 2951
Patent
active
057396299
ABSTRACT:
A double cross-over type electron gun for a color CRT is provided. The electron gun includes a triode having a cathode, a control electrode and a screen electrode, for generating and controlling an electron beam, a plurality of focus electrodes sequentially disposed adjacent to the triode, for forming at least one auxiliary lens, and a final accelerating electrode disposed adjacent to the focus electrode, for forming a main lens. The electron beam generated by the triode includes a cross-over point in front of the main lens and proximate to the auxiliary lens. At least one of the auxiliary lenses disposed upstream from the main lens is formed as a quadrupole lens so that the position of the cross-over point in the horizontal direction and that in the vertical direction are different from each other. When a dynamic focusing voltage is applied, the image quality at the periphery of a screen can be greatly improved.
REFERENCES:
patent: 3798478 (1974-03-01), Say
patent: 5159240 (1992-10-01), Chen et al.
patent: 5256933 (1993-10-01), Jeon
patent: 5394053 (1995-02-01), Yun
patent: 5608284 (1997-03-01), Tojyou et al.
Yang Hak-cheol
Yun Neung-yong
O'Shea Sandra L.
Patidar Jay M.
Samsung Display Devices Co. Ltd.
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