Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1983-07-20
1984-09-04
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
044699921
ABSTRACT:
A circuit is provided for the correction of east-west pincushion distortions on the picture screen of a television receiver. The circuit includes a diode modulator, which is controlled via a coupling coil from a control stage switched by a horizontal scanning frequency, frame frequency modulated rectangular signal as well as a diode connected to the coupling coil for returning of stored energy to an electrical energy supply source of the television receiver. An electronic switch is connected in parallel to the diode. A rectangular pulse signal is applied to the control electrode of the electronic switch. The polarity of the switching connection provided by the electronic switch is opposite to that of the diode. The electronic switch permits a current directed oppositely to the current running through the diode to pass through the coupling coil during the nonconducting phase of the control stage.
REFERENCES:
patent: 4206388 (1980-06-01), Ishigaki et al.
Favreau Jean-Claude
Hartmann Uwe
Mai Udo
Blum Theodore M.
Deutsche Thomson-Brandt GmbH
Kasper Horst M.
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