公开(公告)号：US20180102139A1

公开(公告)日：2018-04-12

申请号：US15427643

申请日：2017-02-08

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Harumitsu MIYASHITA ,  Yasumori HINO ,  Junichi MINAMINO ,  Tsutomu KAI

IPC: G11B20/18 ,  G11B20/12

CPC classification number: G11B20/1816 ,  G11B7/0037 ,  G11B7/00375 ,  G11B7/0948 ,  G11B19/041 ,  G11B20/10314 ,  G11B20/18

Abstract: An inspection method for a recordable optical disc includes focusing laser light on a recording layer and obtaining a data signal dependent on the laser light reflected by the recording layer. The inspection method also includes determining whether the optical disc includes a defect or not by identifying a first period every second period in the obtained data signal obtained, the first period being a period in which a signal level of the data signal is lower than a predetermined value, and each of the second periods corresponding to an ECC block, and outputting a result of the determination.