| 摘要 |
PROBLEM TO BE SOLVED: To improve the yield of optical disks by making it possible to check, at a glance, through which treatment equipment the substrates of the optical disks are passed and when these substrates are treated and to surely obtain the information for forming the production history of the optical disks. SOLUTION: The dummy substrate 900 is placed on the uppermost sheet of the plural stacked substrates 202 when the plural substrates 202 are going to be stocked on a stack pole 24. More specifically, the substrates 202 molded in first molding equipment 12A are stacked on the stack pole 24 having a base 802 coated, for example, red and the dummy substrate 900 is placed on the uppermost substrate thereof. The substrates 202 molded in second molding equipment 12B are stacked on the stack pole 24 having a base 802 coated, for example, green and the dummy substrate 900 is placed on the uppermost substrate thereof.
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