本发明可以实现无损复制，提高母盘的使用寿命，选用大的数值孔径，满足高密度光盘复制的需要。
The invention can realize the nondestructive copy, extend the operating life of the master C. D. and selecting the large numerical aperture to meet the requirement for copying C. D. with high density.
本发明可以实现无损复制，提高母盘的使用寿命，选用大的数值孔径，满足高密度光盘复制的需要。
The invention can realize the nondestructive copy, extend the operating life of the master C. D. and selecting the large numerical aperture to meet the requirement for copying C. D. with high density.
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