| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical disk having no visually conspicuous defect on an image recording surface and having high productivity, and to provide a method for manufacturing optical disks. <P>SOLUTION: In the optical disk having an image forming layer on which a visible image can be drawn by irradiation of laser light, a ratio (B/A) of the maximum length (B) of a maximum bright defect to the maximum length (A) of a maximum dark defect is <1. In the optical disk manufacturing method successively including an image recording layer formation process for forming an image recording layer on which a visible image can be drawn by irradiation of laser light and a defect inspection process for measuring the maximum lengths of a dark defect and a bright defect present on the laser light irradiation surface of a substrate and inspecting the presence of defects, optical disk selecting processing for removing the optical disk whose ratio (B/A) of the maximum length (B) of a maximum bright defect to the maximum length (A) of a maximum dark defect is ≥1 is performed after defect inspection in the defect inspection process. <P>COPYRIGHT: (C)2007,JPO&INPIT |
