| 摘要 |
PURPOSE:To feed back a parabolic voltage and to supply a deflecting current of a high linearity to a vertical deflecting coil by connecting a capacitor and resistance connected serially to the vertical deflecting coil to input terminals of a vertical drive and output stage through the 1st and 2nd feedback loops. CONSTITUTION:An output from a vertical oscillator circuit 1 supplies saw tooth currents to the vertical deflecting coil 3, the DC inhibiting capacitor 4 and the resistance 5 through the vertical drive and the output stage 2, and a voltage inverted by an inverter/amplifier 6 appears in the output terminal of said circuit 1. On the other hand,the parabolic voltage appears in one terminal of the capacitor 4, added to said saw tooth current, and goes to a waveform, where the parabolic voltage and a saw tooth voltage are overlapped, at the input terminals of the drive and the output stage 2, whereby it is subjected to S-correction. When a variable resistance 15 is changed, the component of the saw tooth voltage is made larger or smaller, and therefore the component in the first half or latter half during a scan period can be lifted, whereby only the upper or lower part of a screen can be independently adjusted according to the lifted amount. Moreover, when the variable resistance is changed, the first or latter half during the scan period can be corrected. |
