Cathode ray tube having permanent magnets for modulating the def

Details Cathode ray tube having permanent magnets for modulating the def Cathode ray tube having permanent magnets for modulating the def

1981-12-01

1983-08-02

Harris, George

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Electron or ion beam deflecting type

335210, H01F 100

Patent

active

043968970

ABSTRACT:
The stringent requirements regarding convergence (in color display tubes) and spot quality in monochrome display tubes are met by deflection units which produce dynamic multi-pole fields which are strongly modulated. Static multipole fields, which have a dynamic component when an electron beam passes therethrough, are used in cathode ray tube-deflection unit combinations to simulate, a strong modulation of the dynamic multipole deflection fields. In one combination, the production of a negative static eightpole field in the center of the deflection area improves spot quality.

REFERENCES:
patent: 4109220 (1978-08-01), Peart
patent: 4197487 (1980-04-01), Takemaka et al.
patent: 4231009 (1980-10-01), Barkow

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