Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1993-06-03
1995-03-21
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315408, 315411, G09G 104, H01J 2970
Patent
active
053999452
ABSTRACT:
An East-West switching transistor is coupled between a flyback transformer primary winding and a horizontal deflection output transistor circuit to control retrace energy to obtain an East-West modulation of the deflection current amplitude as required for East-West pincushion raster correction. The East-West switching transistor isolates a retrace resonant circuit that includes a horizontal deflection winding from a flyback resonant circuit that includes the flyback transformer during a portion of retrace. The deflection winding is coupled to a common conductor to permit the use of a retrace voltage sample, developed in the deflection winding and coupled to the East-West switching transistor, to control the switching operation in a manner that bypasses the flyback transformer. A resistor coupled in series with the primary winding develops a voltage, during trace, that is indicative of beam current. The resistor voltage is coupled to the East-West switching transistor to prevent beam current variation from causing raster width variation.
REFERENCES:
patent: 4206388 (1980-06-01), Ishigaki et al.
patent: 4254365 (1981-03-01), Knight
patent: 4429257 (1984-01-01), Haferl
patent: 4634937 (1987-01-01), Haferl
patent: 4890043 (1989-12-01), Davie
patent: 4906902 (1990-03-01), Haferl
patent: 5115171 (1992-05-01), Haferl
Henig Sammy S.
Issing Gregory C.
Laks Joseph J.
RCA Thomson Licensing Corporation
Tripoli Joseph S.
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