Electron gun and color picture tube apparatus that attain a...

Details Electron gun and color picture tube apparatus that attain a... Electron gun and color picture tube apparatus that attain a...

2005-08-09

2005-08-09

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

C313S412000, C313S428000, C313S432000, C313S437000, C313S439000

Reexamination Certificate

active

06927531

ABSTRACT:
A set of three cathodes, a control electrode, an accelerating electrode, a first focus electrode, a second focus electrode, a third focus electrode, a fourth focus electrode, a final accelerating electrode and a shield cup electrode are provided successively in an electron beam travelling direction. The shield cup electrode has a pair of screen-shaped electrodes that sandwich electron-beam through-holes in a vertical direction. A quadrupole lens that has a horizontal convergent action and a vertical divergent action is generated by an electrical potential difference between the screen-shaped electrodes and the final accelerating electrode. Accordingly, even if vertical and horizontal convergence power difference in a main lens formed by the fourth focus electrode and the final accelerating electrode is not large, a composite lens formed through a combination of the quadrupole lens and the main lens has strong horizontal convergence power and weak vertical convergence power.

REFERENCES:
patent: 5212423 (1993-05-01), Noguchi et al.
patent: 5610481 (1997-03-01), Shirai et al.
patent: 5675211 (1997-10-01), Ueda
patent: 6046537 (2000-04-01), Sukeno
patent: 6320333 (2001-11-01), Ueda et al.
patent: 2002/0008457 (2002-01-01), Nakamura et al.
patent: 000901146 (2001-10-01), None

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