Display tube with magnetic correction elements

Details Display tube with magnetic correction elements Display tube with magnetic correction elements

1987-09-29

1989-01-31

Moore, David K.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313431, 313442, H01J 2956

Patent

active

048018430

ABSTRACT:
Display tube such as a projection television display tube or a DGD tube (DGD=Data Graphic Display), including an electron gun (5) in an evacuated envelope (1) for generating an electron beam (6) which is focussed to a spot (8) on a display screen (7) with the aid of an electrostatic focussing lens (27, 30) and which is deflected across the display screen (7) in two mutually perpendicular directions (x, y). If a correction structure (37) consisting of magnetic half-hard material is provided in such a tube in the proximity of the focussing lens (27, 30) and coaxially of the gun axis (20) in which at least one magnetic 2N pole (N.gtoreq.2) is induced for correcting spot shape errors, a high spot quality can be realized with low-cost deep-drawn lens electrodes (27, 30).

REFERENCES:
patent: 3887830 (1975-06-01), Spencer
patent: 4268777 (1981-05-01), van Roosmalen
patent: 4424466 (1984-01-01), Zeppenfeld
patent: 4468587 (1984-08-01), Sluyterman
patent: 4591755 (1986-05-01), Kornaker

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