Electron gun having unipotential focusing lenses for color pictu

Details Electron gun having unipotential focusing lenses for color pictu Electron gun having unipotential focusing lenses for color pictu

1989-11-01

1991-07-23

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Plural beam generating or control

313449, H01J 2948

Patent

active

050346539

ABSTRACT:
An electron gun for use in a color picture tube includes electrodes forming at least one unipotential focusing lens for focusing electron beams. An electrode disposed between first and second electrodes forming a unipotential focusing lens includes first and second plate-shaped members. The first member forms, in cooperation with the first electrode, a focusing lens having an electrostatic field weaker in the vertical direction than in the lateral direction. The second member forms, in cooperation with the second electrode, a focusing lens having an electrostatic field weaker in the vertical direction than in the lateral direction. The electron gun removes halos appearing in the peripheral region of the tube screen.

REFERENCES:
patent: 4317065 (1982-02-01), Hughes
patent: 4443736 (1984-04-01), Chen
patent: 4701677 (1987-10-01), Ashizaki et al.
patent: 4825120 (1989-04-01), Takahashi

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