Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1989-12-18
1990-11-06
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
049689193
ABSTRACT:
Circuits are disclosed for increasing the differential pin-cushion distortion on one of the sides of an image on an CRT and simultaneously decreasing the pin-cushion on the other side of the image. In one embodiment of the invention, the circuit comprises a waveform generator for adjustable producing a repetitive control voltage which is the combination of at least one of a ramping voltage, a parabolic voltage, and a sinusoidal voltage and which has a period generally equal to the vertical rate; and a variable clipper to control the output of an automatic phase controller in the horizontal sweep circuit by modulating the slope of the feedback signal sent to the controller as a function of the repetitive control voltage from the waveform generator.
REFERENCES:
patent: 4206388 (1980-06-01), Ishigaki et al.
patent: 4748384 (1988-05-01), Oliver
patent: 4766354 (1988-08-01), Oliver
patent: 4794307 (1988-12-01), Haferl
patent: 4814104 (1980-01-01), Shouse, Jr.
patent: 4827194 (1989-05-01), Fernsler
patent: 4845409 (1989-07-01), Oliver
Blum Theodore M.
Zenith Electronics Corporation
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