发明授权
- 专利标题： Optical disc
- 专利标题（中）： 光盘
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申请号： US122186申请日： 1987-11-18
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公开(公告)号： US4911968A公开(公告)日： 1990-03-27
- 发明人: Tosio Higasihara , Ken Yoshizawa , Masahiro Suzuki , Akira Gotoh , Yoshitane Tuburaya
- 申请人： Tosio Higasihara , Ken Yoshizawa , Masahiro Suzuki , Akira Gotoh , Yoshitane Tuburaya
- 申请人地址： JPX Osaka
- 专利权人： Hitachi Maxell, Ltd.
- 当前专利权人： Hitachi Maxell, Ltd.
- 当前专利权人地址： JPX Osaka
- 优先权： JPX60-28221 19850218; JPX60-52369 19850318
- 主分类号： G11B7/24
- IPC分类号： G11B7/24 ; G11B7/26
摘要：
An optical recording disc which includes a pair of recording disc substrates opposed to each other with a space therebetween, with a hub situated at the central portion of the disc substrates so that there is formed the closed space between the disc substrates, thereby providing a dual sided recordable optical recording disc. The hub may be formed by a pair of hub halves. There is disposed an annular inner spacer and annular outer spacer around the hub so as to separate the pair of recording disc substrates.
公开/授权文献
- US5399536A Silicon nitride sintered body 公开/授权日：1995-03-21
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