In-line type electron guns for color picture tube

Details In-line type electron guns for color picture tube In-line type electron guns for color picture tube

1994-09-28

1996-08-06

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, H01J 2950

Patent

active

055436811

ABSTRACT:
In-line type electron guns for a color picture tube. In this electron guns, the third electrode or the G.sub.3 electrode is divided into two focusing electrodes, that is, first and second focusing electrodes. The envelop of the first focusing electrode has at its front end a control electrode plate provided with at least three rectangular openings, the vertical size of each the rectangular opening being larger than the horizontal size. An electrode body for electrostatic control of the three electron beams is recessed in the electrode envelop of the G.sub.4 electrode. A dynamic focus voltage is applied to the second focusing electrode, thus to form a horizontally converging lens and a vertically diverging lens. The horizontally converging lens and the vertically diverging lens compensate the horizontal divergence and vertical convergence of the electron beam which are caused by the deflection magnetic fields of the deflection yoke when the electron beam is deflected to the screen comers. The in-line type electron guns improve the resolution of the screen. This electron guns also minimize the variation of the dynamic focus voltage, thus to save the power.

REFERENCES:
patent: 4599534 (1986-07-01), Shirai et al.
patent: 4672261 (1987-06-01), Shirai et al.
patent: 5025189 (1991-06-01), Son
patent: 5032760 (1991-07-01), Kim
patent: 5300855 (1994-04-01), Kweon

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