Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1981-05-18
1984-01-24
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 13C, H01J 2970, H01J 2976
Patent
active
044279264
ABSTRACT:
Attainment of exacting dynamic convergence or beam registration is realized in a multi-gun, multi-colored cathode ray tube display system which maintains beam superposition across the display area of the cathode ray tube regardless of scanning direction or scanning rate. The system is particularly effective in maintaining exacting convergence in random scanned displays wherein scanning direction and scanning rates vary considerably. Inherent lag differences in convergence force fields as compared to deflection force fields is compensated and corrected by the summation of each of the horizontal and vertical scan signals with a signal representing the sign and magnitude of the rate of change thereof and with this summation being applied to convergence signal development circuitry rather than the scan signal per se being applied as in conventional known convergence systems.
REFERENCES:
patent: 3891889 (1975-06-01), Fazio
patent: 3942067 (1976-03-01), Cawood
patent: 4331906 (1982-05-01), Fujino et al.
patent: 4354143 (1982-10-01), Judd
Anderson Richard W.
Blum Theodore M.
Hamann H. Fredrick
Montanye George W.
Rockwell International Corporation
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