Focusing electrode in electron gun for color cathode ray tube

Details Focusing electrode in electron gun for color cathode ray tube Focusing electrode in electron gun for color cathode ray tube

1998-02-25

2000-04-18

Patel, Nimeshkumar D.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 313412, 315382, H01J 2950

Patent

active

060519207

ABSTRACT:
A focusing electrode in an electron gun for a color cathode ray tube comprises: a first focusing electrode including one end with vertical plate electrodes projected toward cathodes in three vertically elongated electron beam through holes, and an inner electrode having three electron beam through holes disposed therein, adapted to be applied of a static voltage; and a second focusing electrode including horizontal plate electrodes respectively formed at upper and lower sides of three electron beam through holes inserted into the vertically elongated electron beam through holes in the first focussing electrode, adapted to be applied of a dynamic voltage synchronous to a deflection of the electron beams, wherein a dynamic quadrupole lens is formed among the vertical plate electrodes, the horizontal plate electrodes, and the inner electrode when applying the dynamic voltage to the second focusing electrode, and the intensity of the dynamic quadrupole lens can be controlled by controlling the depth of the inner electrode which is mounted in the first focusing electrode.

REFERENCES:
patent: 5300855 (1994-04-01), Kweon
patent: 5739630 (1998-04-01), Shirai et al.
patent: 5831399 (1998-11-01), Ohta et al.

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