| 摘要 |
PURPOSE: To reduce components and to perform appropriate sigmoid correction corresponding to plural horizontal scanning frequencies by turning on and off a switch connected to a sigmoid correction capacitor within respective horizontal scanning cycles. CONSTITUTION: When signals for turning off an FET 8 for switching are inputted to the gate of the FET 8 at a timing t1 from a switch control circuit 10, a current made to flow to the sigmoid correction capacitor 7 is cut off at the timing t1 as well. As a result, the FET 8 is turned off and a charging current is made to flow only to the sigmoid capacitor 6 of this sigmoid correction adjustment circuit A. The sigmoid capacitor 6 is charged up to maximum corresponding to the horizontal scanning cycle at the timing t2 of a scanning period and the capacitor 6 is discharged after the timing t2. A horizontal output transistor 1 is turned on by the discharging and a discharging current is made to flow from the capacitor 6 in the route of a linearity coil 5, a deflection yoke 4, the transistor 1 and the capacitor 6. |
