Cathode-ray-tube astigmatism correction apparatus

Details Cathode-ray-tube astigmatism correction apparatus Cathode-ray-tube astigmatism correction apparatus

1985-03-05

1990-02-06

Tarcza, Thomas H.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

313414, 313437, H01J 2958, H01J 2950, H01J 2974

Patent

active

048990914

ABSTRACT:
Apparatus for correcting astigmatism produced by the electromagnetic deflection yoke of a cathode-ray-tube includes stigmator electrodes provided with elongated slots through which the cathode-ray-tube's electron beam or beams pass. 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.

REFERENCES:
patent: 3544836 (1970-12-01), Reisner
patent: 3753034 (1973-09-01), Spicer
patent: 3919583 (1975-11-01), Hasker et al.
patent: 3961223 (1976-06-01), Ray et al.
patent: 4143293 (1979-03-01), Hosokoshi et al.
patent: 4242613 (1980-12-01), Bambring et al.
patent: 4249112 (1981-02-01), McKibben
patent: 4366414 (1982-12-01), Hatayama et al.
patent: 4366419 (1982-12-01), Barten
patent: 4374342 (1983-02-01), Say

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