| 摘要 |
PURPOSE:To always obtain the most appropriate sigmoidal correction by obtaining a signal given to an output amplifier by operating voltage having a square-low characteristic corresponded with frequency and parabolic voltage generating at the terminal of a sigmoidal capacitor. CONSTITUTION:Assuming that the maximum value of a horizontal deflection frequency is set at fHmax and the minimum value as fHmin and the most appropriate value of a sigmoidal correction capacitor 12' is selected by the fHmin and is regulated, the fHmin is short of the sigmoidal correction. So a device is constituted that the insufficient portion of the sigmoidal correction is flowed to a deflecting coil 3' using sigmoidal correcting power sources 18 and 19 and sigmoidal correction outputting transistors 20 and 21, a sigmoidal correction driving transistor 24, resistors 22 and 23, a transformer 25 and an amplifier 26 varying corresponding with control voltage. Insufficient sigmoidal correction current can be flowed by impressing the parabolic voltage generating at a point C between a point A and a point B. Also, by impressing the parabolic voltage with reversed polarity on the transformer 25, inverting by the transistor 24 and amplifying with the transistors 20 and 21 connected in push/pull, it is possible to generate the parabolic voltage at the point between the point A and the point B. |
