Using the transparence CD, PSD can detect the displacement of laser spot between non-placing and placing the CD, and it can be used to calculate the parallelism between optical head and spindle motor.
考虑在主轴上放置透明盘片，用PSD测量位移子系统测出放置透明盘片前后的光斑移动距离，就可以计算出光头与主轴马达间的平行度。
By study the measurement of parallelism between Optical head and Spindle motor at present, we find that there are expensive and inconvenient. So it needs to design a new convenient method.
对目前工业上测量光头与主轴马达间的平行度的方法进行研究后，发现其价格昂贵、操作不方便，因此有必要设计出一套方便可行的方法。
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