Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-05-05
1989-05-02
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
048271934
ABSTRACT:
A terminal of the vertical deflection coil is connected to an integrating circuit, which generates a saw-tooth signal from the vertical deflection current for vertical synchronization. The saw-tooth signal is supplied to the clipping circuit having a diode so as to clip its waveform. The clipped signal and said parabolic signal are summed by an adding means in order to generate a correction signal. The correction signal is amplified with an amplifying transistors and supplied to the primary winding of the transformer, the secondary winding of which is serially connected to the horizontal deflection coil. The waveform of the signal that is summed up, is similar to the form of the pin cushion distortion indicated on the raster of a non-spherical CRT. Therefore, the correction singal modulates the amplitude of a current flowing through the horizontal deflection coil, so that the pin cushion distortion can be corrected on the luster.
REFERENCES:
patent: 3944879 (1976-03-01), Suzuki
patent: 4623818 (1986-11-01), Yamazaki
patent: 4687972 (1987-08-01), Haferl
Nakamura Yoichi
Watanuki Kiyoshi
Blum Theodore M.
Hitachi , Ltd.
Issing Gregory C.
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