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为了对大偏转角下的超薄CRT图像S畸变进行校正,针对匀强磁场和六极场以及理想纯平和实际曲率荧光屏的情况,分别推导了进行S校正以实现匀速屏幕扫描所需的扫描电流理论形式.继而采用高阶正弦信号来逼近这一理论电流波形,以便于电路实现.优化计算后的扫描电流可以在90°直到140°的偏转角范围内以足够精度逼近理论值,谐波阶数随着角度增大而增加直至四阶.提出了一种梯形电路来实现这一方法,模拟和实验结果证实了该方法对校正S畸变的效果.
In order to correct S distortion of ultra-thin CRT images under a large deflection angle, the scanning currents required for S-correction to achieve uniform screen scanning are deduced for uniform magnetic field and six-pole field and ideal flat and real curvature fluorescent screens The theoretical form is followed by a high-order sinusoidal signal approximating the theoretical current waveform for circuit implementation.The optimized calculated scan current can approach the theoretical value with sufficient accuracy over a deflection angle of 90 ° up to 140 °, The number increases with the angle up to the fourth order. A ladder-type circuit is proposed to implement this method. The simulation and experimental results confirm the effectiveness of the proposed method in correcting S-distortion.