| 摘要 |
PROBLEM TO BE SOLVED: To prevent occurrence of screen noise and deteriorated fault by adopting the circuit configuration such that a horizontal oscillation circuit and an oscillation circuit for a switching regulator for power supply voltage control are used in common. SOLUTION: A horizontal drive pulse H.DR outputted from a horizontal oscillation circuit 1 is fed to a horizontal output circuit 3 via a horizontal driving circuit 2, from which a horizontal deflection current is generated. Similarly, a horizontal drive pulse H.DR outputted from the horizontal oscillation circuit 1 is fed to a high voltage output circuit 7 via a high voltage driving circuit 6, from which a high voltage is generated. On the other hand, a 1st switching regulator 5 controls a power supply voltage EB1 fed to the horizontal output circuit 3 so that the amplitude of the output from a deflection current detection circuit 4 is constant. Furthermore, a 2nd switching regulator 9 controls a power supply voltage EB2 fed to the high voltage output circuit 7 so that the amplitude of the output from a high voltage detection circuit 8 is constant. |
