Dynamic 4 polar electrode system in pre-focusing electrode in el

Details Dynamic 4 polar electrode system in pre-focusing electrode in el Dynamic 4 polar electrode system in pre-focusing electrode in el

1997-03-24

1999-11-23

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313414, G09G 104, H01J 2950

Patent

active

059906375

ABSTRACT:
A pre-focus electrode system in an electron gun for a color cathode ray tubes disclosed, the color cathode ray tube including, in successive arrangement, a three electrode part having a plurality of cathodes each for emitting electron beams, a control electrode for controlling emission of the electron beams, an accelerating electrode for accelerating the electron beams, at least two pre-focus electrodes for pre-focusing the electron beams, and a focusing electrode and an anode for forming a main lens for focusing the electron beams on a screen. The focusing electrode has two electrodes provided by dividing the focusing electrode into two to form a first dynamic four polar lens part with one of the two electrode applied of a static voltage and the other electrode applied of a dynamic voltage synchronous to a deflection current. The dynamic four polar electrode system includes at least two sub pre-focus electrodes provided by dividing one of the pre-focus electrodes on a screen side, at least one of the sub pre-focus electrodes having electron beam pass-through holes with different horizontal and vertical sides and at least one of the sub pre-focus electrodes has a dynamic voltage applied to it causing at least one dynamic four polar lens part to be formed between the sub pre-focus electrodes.

REFERENCES:
patent: 5164640 (1992-11-01), Son et al.
patent: 5347202 (1994-09-01), Stil
patent: 5384512 (1995-01-01), Kamohara et al.
patent: 5404071 (1995-04-01), Son
patent: 5539285 (1996-07-01), Iguchi et al.

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