| 摘要 |
PURPOSE:To improve the resolution of the circumferential part of a screen by connecting a parallel resonating circuit, tuned at a horizontal scan frequency, to a series resonating circuit in series in a TV receiver and by extracting a dynamic focus correcting voltage from the connection point between the series circuit and parallel circuit. CONSTITUTION:A horizontal flyback pulse is passed through capacitor 18 and inductance 19 of a series resonating circuit tuned at a horizontal scan frequency and further applied to capacitor 21 and coil 20 of a parallel resonating circuit tuned at the horizontal scan frequency. Thus, two resonating circuits are used to hold input impedance to a dynamic focus circuit high over the entire range of frequencies, and a correcting voltage tuned at the horizontal scan frequency is extracted from connection point D between the series and parallel resonating circuits. Consequently, the resolution of the circumferential part of a screen is improved. |
