Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-09-29
1988-12-27
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
047943076
ABSTRACT:
East-West modulated current that is generated in an East-West control circuit is coupled to a deflection circuit output stage via a Class A operated amplifier serving as a current source having a high output impedance during retrace. The current source prevents coupling of a signal at a retrace frequency during retrace between a high voltage winding of the flyback transformer and a retrace resonant circuit that includes the deflection winding. The high output impedance of the amplifier current source during retrace maintains the average value of the modulated current during retrace unaffected by an amplitude of a retrace voltage that is developed in the retrace resonant circuit. In this way ultor voltage loading variation is prevented from causing "mouseteeth" distortions.
REFERENCES:
patent: 4182978 (1980-01-01), Boekhorst
patent: 4429257 (1984-01-01), Haferl
patent: 4625154 (1986-11-01), Willis
patent: 4634937 (1987-01-01), Haferl
patent: 4687972 (1987-08-01), Haferl
Technical publication 201 published by Philips, Co. dated Apr. 10, 1987.
U.S. patent application Ser. No. 875,708 filed 6/18/86, entitled Raster Correction Circuit, in the name of P. E. Haferl, the above applicant.
Blum Theodore M.
Issing Gregory C.
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