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1.发明申请公开(公告)号：US20200051590A1
公开(公告)日：2020-02-13
申请号：US16519426
申请日：2019-07-23
Applicant: SONY CORPORATION
Inventor： Hiroshi NAKAYAMA , Hiroyuki TAKEMOTO , Minoru KIKUCHI , Minoru MATSUURA
IPC: G11B7/2534 , B29D17/00
Abstract: There is provided an optical recording medium substrate including a polycarbonate in which an average molecular weight is in a range from 15000 to 16000, and mass per unit volume at 25° C. is in a range from 1.1930 g/cm3 to 1.2000 g/cm3.
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