Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1996-05-03
1998-07-14
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
348806, H01J 2958
Patent
active
057809780
ABSTRACT:
A vertical focusing circuit is disclosed wherein a constant gain control of a vertical focusing signal is enabled to obtain an optimal dynamic focusing control without subjecting to a variance of vertical frequency. The circuit for generating a vertical focusing circuit so as to form a dynamic focusing signal and to supply the signal to a flyback transformer, comprises a microcomputer for generating a predetermined voltage level of a direct current corresponding to a vertical frequency; a parabolic waveform signal generator for generating a parabolic waveform using the voltage level and a cycle of a vertical blanking signal; a buffer means for improving a distortion caused by an impedance unbalance of the parabolic waveform signal output from the parabolic waveform signal generator; and an amplifier for amplifying a signal output of a parabolic waveform generated from the buffer to a predetermined voltage level. As a result, a vertical focusing signal voltage gain is obtained at a constant value without subjecting to a variance of a vertical frequency currently being employed, thereby enabling a multimode monitor to maintain a dynamic focusing operational mode. In addition, a user-controlled mode of a vertical focusing gain control is able to be adapted to a preferred embodiment of the instant invention.
REFERENCES:
patent: 5430358 (1995-07-01), George
patent: 5534757 (1996-07-01), Takatori
Blum Theodore M.
Bushnell Esq. Robert E.
Samsung Electronics Co,. Ltd.
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