Dynamic focusing electron gun

Details Dynamic focusing electron gun Dynamic focusing electron gun

1996-08-16

1999-01-26

O'Shea, Sandra

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, 315 15, 315382, H01J 2956

Patent

active

058642030

ABSTRACT:
An electron gun of a multi-stage convergence type includes a plurality of focusing electrodes, wherein a quadrupole lens nearest to a cathode has a diverging function in the horizontal scanning direction and a converging function in the vertical scanning direction, and a quadrupole lens in the next stage has a converging function in the horizontal scanning direction and a diverging function in the vertical scanning direction. In this structure, even when a voltage synchronized with a deflection current is superposed on a constant focus voltage, applied to the focusing electrode, the operation of the quadrupole lenses is not influenced significantly.

REFERENCES:
patent: 4086513 (1978-04-01), Evans, Jr.
patent: 4825120 (1989-04-01), Takahashi
patent: 4886999 (1989-12-01), Yamane et al.
patent: 5061881 (1991-10-01), Suzuki et al.
patent: 5384512 (1995-01-01), Kamohara et al.
patent: 5404071 (1995-04-01), Son

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