Parabolic-wave shaping circuit for focus-correction

Details Parabolic-wave shaping circuit for focus-correction Parabolic-wave shaping circuit for focus-correction

1997-04-21

1998-06-02

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

G09G 104

Patent

active

057605491

ABSTRACT:
A focus correcting circuit for a CRT including a parabolic wave outputting circuit for outputting a combined signal of a vertical parabolic wave and a horizontal parabolic wave as an output wave, and a parabolic wave shaping circuit for clipping the output wave making it possible to lower the power supply voltage necessary for outputting the parabolic waveforms. The parabolic wave shaping circuit includes one or more holding circuits for receiving a blanking pulse used to clip a portion of the output wave corresponding to a flyback period of the CRT.

REFERENCES:
patent: 4683405 (1987-07-01), Truskalo et al.

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