8 balancing head is not opposite photoelectric light paper, photoelectric head mirror, photoelectric position deviation caused by angle.
动平衡机光电头未对正反光纸，光电头镜面模糊，光电头位置偏斜引起角度偏移。
Operating principle, characteristics and technical key of photoelectric scanning head are described.
论述了光电扫描头的工作原理，性能特征以及设计中的技术关键。
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