Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-03-25
1988-09-13
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315396, H01J 2954
Patent
active
047712171
ABSTRACT:
A deflection current from a vertical deflection output circuit is supplied to a series circuit of a vertical deflection coil and a capacitor. A pair of transistors are coupled to a DC voltage source in a complementary arrangement. The bases of these transistors are coupled to a slidable end of a variable resistor coupled to the DC voltage source, respectively through constant voltage elements, which are coupled to each other in the opposite directions. The node of these two transistors is coupled to the node of the deflection coil and the capacitor. As the position of the slidable end of the variable resistor is moved away from the center, one transistor of the pair becomes conductive. With this arrangement, a deflection current free of ripple components can be supplied to the deflection coil in order to adjust the vertical position of an image on the screen of a CRT.
REFERENCES:
patent: 3020443 (1962-02-01), Teetor
patent: 3881134 (1975-04-01), Haferl
patent: 3994882 (1976-03-01), Takahashi
patent: 4164688 (1979-08-01), Cushing
patent: 4188567 (1980-02-01), Monroe
patent: 4238713 (1980-12-01), Moles
patent: 4314184 (1982-02-01), Ryan
Blum Theodore M.
Cain David
Kabushiki Kaisha Toshiba
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