| 摘要 |
PURPOSE:To facilitate optimum focus by rectifying an output of a coil provided to the primary winding of a flyback transformer, supplying the result to a grid and superimposing a DC output voltage onto the secondary winding of the flyback transformer with adjustment. CONSTITUTION:An AC outputted from a coil L4 provided in series with a primary coil L1 of a flyback transformer (FBTR) 12 is rectified and smoothed by a diode D2 and a capacitor C3 to generate a DC voltage VG2, which is fed to a grid G2 of a CRT 10. On the other hand, the DC voltage VG2 is adjusted by a variable resistor R1 to superimpose the voltage onto the secondary coil L2 of the FMRT 12 to adjust the output voltage VA of the rectifier circuit Recf thereby controlling the anode voltage of the CRT 10. Thus, the circuit is simplified and stable focus adjustment is attained. |
