Convergence circuit

Details Convergence circuit Convergence circuit

1987-08-12

1989-03-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, H01J 2970, H01J 2956

Patent

active

048146714

ABSTRACT:
A convergence apparatus in which a sawtooth wave signal having a horizontal period is modulated by a sawtooth wave signal having a vertical period and supplied to a convergence coil to correct misconvergence of rasters on the projection screen, characterized in that the sawtooth wave signal having the horizontal period is derived by integrating a pulse advanced in phase as compared with the flyback pulse by a PPL circuit and hence the distortion of the sawtooth wave signal having the horizontal period exists within a horizontal blanking period.

REFERENCES:
patent: 3953760 (1976-04-01), Matsuura et al.
patent: 4631587 (1986-12-01), Turner

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