Picture display device

Details Picture display device Picture display device

1990-01-08

1991-01-29

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313450, H01J 2958

Patent

active

049889290

ABSTRACT:
Picture display device comprising a display tube having an electron gun with an electrostatic focusing lens for generating a focusing lens field, which tube further comprises deflection means for generating a deflection field. The focusing lens field partly overlaps the deflection field. The focusing lens comprises a tubular structure having an inner surface on which a helical resistance structure of a material having a high electrical resistance is provided, which tubular structure has a coaxial input portion and a coaxial output portion, the output portion having dimensions which prevent the deflected electron beam from impinging upon the glass of the inner wall. Correction means may be provided for correcting errors caused by the advanced position of the focusing lens.

REFERENCES:
patent: 4827184 (1989-05-01), Spanjer et al.
patent: 4857797 (1989-08-01), Vrijssen et al.

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