| 摘要 |
PURPOSE:To enable to obtain a constant deflection speed, by providing the deflection coil for correction other than the main horizontal deflection coil, taking n-th power for parabola voltage in horizontal period, and correcting the change in the deflection speed with the trapezoidal wavelike correcting voltage of horizontal direction. CONSTITUTION:The main horizontal deflection coil 51 is arranged at the back of the picture tube 60, and the horizontal deflection coil 52 for correction is provided to the coil 51 at the back of the coil 51. The S shape correction capacitor 55 is connected in series with the coil 51 to produce the parabola voltage in horizontal period across the coil. This voltage is fed to the square circuit 80 through a capacitor 71 and resistor 72, and square is made with the square characteristics of the diode 82 to generate the correction voltage of almost trapezoidal shape. The voltage squaring the parabola voltage in horizontal period with the square circuit 80 is fed to the amplifier 90 through the level adjusting potentiometer 73 and capacitor 74 and given to the correction coil 52 with a given polarity to correct the change in the deflection speed, so that the deflection speed can be constant from the left end to right on the screen. |
