Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-05-14
1992-05-12
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2956
Patent
active
051131226
ABSTRACT:
A horizontal deflection apparatus which is provided with a circuit to convert a vertical deflection voltage into a crosswise pincushion distortion correction voltage in a parabola form, a vertical frequency detecting circuit which detects a frequency of a vertical synchronizing signal and outputs a control signal of a voltage corresponding to the frequency, an automatic gain control circuit which amplifies the correction voltage with the gain controlled in response to the control signal corresponding to the outputted vertical frequency and outputs a voltage signal in a parabola form with a fixed amplitude for correcting a crosswise pincushion distortion, a pulse width modulating circuit which modulates a pulse signal synchronized with a horizontal synchronizing signal in response to the outputted voltage signal from the automatic gain control circuit, and a chopper-type power circuit which chops a power voltage with the pulse width modulating output and gives the chopped power voltage to a horizontal output circuit, thereby correcting the crosswise pincushion distortion in response to the voltage signal with the fixed amplitude irrespective of the change of the vertical frequency, and enabling adequate correction of the crosswise pincushion distortion even if the vertical frequency changes.
REFERENCES:
patent: 4305023 (1981-12-01), Willis
patent: 4956586 (1990-09-01), Gipson et al.
Bando Takahiro
Tomimatsu Noriyuki
Blum Theodore M.
Mitsubishi Kenki Kabushiki Kaisha
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