公开(公告)号：US20240158281A1

公开(公告)日：2024-05-16

申请号：US18548890

申请日：2022-03-04

Applicant: HOYA CORPORATION

Inventor： Shuzo TOKUMITSU ,  Kazuaki HASHIMOTO

IPC: C03C3/085 ,  C03C3/091 ,  C03C3/095 ,  G11B5/73

CPC classification number: C03C3/085 ,  C03C3/091 ,  C03C3/095 ,  G11B5/73921

Abstract: Provided is a glass for a magnetic recording medium substrate or for a glass spacer for a magnetic recording/reproducing device, the glass being an amorphous glass that contains at least Li2O, in which a total content of Na2O and K2O is 0 mol % or more and 6.0 mol % or less, a B2O3 content is 0 mol % or more and 10.0 mol % or less, and a CaO content is 0 mol % or more and 1.0 mol % or less.