| 摘要 |
PURPOSE:To prevent expansion of a beam spot due to an improper anode voltage by connecting a variable resistance of low resistance value in series with a primary coil circuit of a flyback transformer. CONSTITUTION:A flyback transformer 7 of a high voltage power supply circuit which supplies an anode voltage Va to a button terminal 6 of an anode 3 is provided with a primary coil 9 connected to a horizontal output circuit 8 and a secondary coil 11 connected to the anode button terminal 6 through a diode 10, and an about 5OMEGA variable resistance 12 is connected in series with the DC power supply side of the primary coil 9. The variable resistance 12 is adjusted and operated to adjust the anode voltage Va, thereby supplying the anode voltage suitable for generation of the beam spot having a minimum diameter on the fluorescent surface of a cathode-ray tube device. |
