Cathode ray tube having a magnetic focusing lens

Details Cathode ray tube having a magnetic focusing lens Cathode ray tube having a magnetic focusing lens

1987-06-09

1988-07-19

DeMeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Beam deflecting means

313442, H01J 2956, H01J 2964

Patent

active

047587628

ABSTRACT:
A monochrome cathode ray tube having an electromagnetic deflection unit (9) and a directly adjoining integrated focusing multipole correction unit (10) which serves both to generate a static focusing field and to generate higher order multipole correction fields to correct for spot distortion errors. In particular quadrupole fields are generated to correct for astigmatism errors.

REFERENCES:
patent: 3230415 (1966-01-01), Kratochvil et al.
patent: 4642527 (1987-02-01), Takahashi et al.

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