CRT astigmatism correction apparatus with stored correction valu

Details CRT astigmatism correction apparatus with stored correction valu CRT astigmatism correction apparatus with stored correction valu

1984-05-29

1987-06-09

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 313437, H01J 2958

Patent

active

046722769

ABSTRACT:
Apparatus for correcting astigmatism produced by the electromagnetic deflection yoke of a cathode-ray-tube includes plural stigmator electrodes provided with elongated slots through which the cathode-ray-tube's electron beam passes. Appropriate correction voltages, stored in digital memory, are applied to the stigmator and focus electrodes for bringing about re-focusing of the electron beam in appropriate axes for restoring a single point focus on the cathode-ray-rube's screen.

REFERENCES:
patent: 3544836 (1970-12-01), Reisner
patent: 3740608 (1973-06-01), Manber et al.
patent: 4249112 (1981-02-01), McKibben

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