Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1982-03-09
1985-11-12
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
358 51, 330275, H01J 2970
Patent
active
045530734
ABSTRACT:
A deflection control circuit for a plural-tube color television camera adjusts the deflection sawtooth waves furnished to the red and blue image pickup tubes to register the images thereof with the image of the green pickup tube, and eliminate any centering, skew, rotation, or other errors. The circuit includes a pair of controllable complementary transistors, with current outputs connected together in series. An impedance is connected to the junction of the current outputs, and a sawtooth wave, furnished directly to the green pickup tube, is also supplied therethrough. A correction signal generator preferably formed of an integrated-circuit operational amplifier supplies a correction voltage to control terminals of the transistors so that the current through the latter changes complementarily. An adjusted output sawtooth wave is provided from the junction to the transistors to one of the red and blue pickup tubes. Because the correction signal generator operates at low voltage, such as .+-.18 V, while the sawtooth wave is provided at a high voltage, such as .+-.80 V, a level conversion circuit is interposed between the correction signal generator and the control inputs of the complementary transistors. This circuit can include a pair of complementary transistors each having its emitter and collector coupled through respective resistors to the low and high voltages. Alternatively, this circuit can include a pair of complementary common-base transistors, the low voltages being applied thereto as reference levels.
REFERENCES:
patent: 4039862 (1977-08-01), Dingwall et al.
patent: 4051512 (1977-09-01), van Roosmalen et al.
patent: 4224556 (1980-09-01), Muto
Nakamura Takashi
Yamaji Kazunori
Blum Theodore M.
Eslinger Lewis H.
Issing Gregory C.
Sinderbrand Alvin
Sony Corporation
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