Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1992-07-15
1994-02-15
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315393, G09G 104, H01J 2956, H01J 2972
Patent
active
052870413
ABSTRACT:
A side pin cushion circuit for keeping exact the period corresponding to the frequency of a synchronizing signal so as to prevent a pin cushion distortion in a cathode ray tube displayer. The side pin cushion circuit comprises a vertical deflection portion for generating a saw-tooth signal whose period varies according to the frequency of a vertical synchronizing signal, first amplifying portion for amplifying the saw-tooth signal supplied from the vertical deflection portion and converting the amplified saw-tooth signal to a pin cushion signal, a second amplifying portion for amplifying the pin cushion signal supplied from the first amplifying portion and supplying the amplified pin cushion signal to a mixer, a controlling switch for switching the pin cushion signal supplied to the mixer from the second amplifying portion, and a switch controller for detecting the frequency of the vertical sychronizing signal depending on the voltage level of the saw-tooth signal supplied from the vertical deflection portion and for controlling the controlling switch every period corresponding to the frequency of the detected vertical synchronizing signal.
REFERENCES:
patent: 4365270 (1989-12-01), Rutishauser
patent: 4547708 (1985-10-01), Haferl
patent: 4691147 (1987-09-01), Kashiwagi
patent: 4827193 (1989-05-01), Watanuki et al.
patent: 5113122 (1992-05-01), Bando et al.
Gold Star Co. Ltd.
Issing Gregory C.
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