发明授权
- 专利标题: Optical information recording medium with plural information layers
- 专利标题(中): 具有多个信息层的光信息记录介质
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申请号: US10413934申请日: 2003-04-14
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公开(公告)号: US06771587B2公开(公告)日: 2004-08-03
- 发明人: Kenichi Nishiuchi , Ken'ichi Nagata , Nobuo Akahira
- 申请人: Kenichi Nishiuchi , Ken'ichi Nagata , Nobuo Akahira
- 优先权: JP7-082248 19950407; JP7-214326 19950823
- 主分类号: G11B370
- IPC分类号: G11B370
摘要:
In an optical information recording medium having at least two information layer, guide grooves for tracking or sample pits or information pits corresponding to information signals are formed on a surface of a first substrate. A first information layer formed by a thin film for reflecting a portion of a light beam made incident on the first substrate and permitting penetration of a portion of the light beam is formed on a surface of the first substrate. Guide grooves for tracking or information pits corresponding to information signals are formed on a surface of a second substrate. A second information layer having a reflectance higher than that of the first information layer is formed on a surface of the second substrate. Between the first information layer and the second information layer, there is formed a transparent separation layer for positioning the first information layer and the second information layer to be spaced a predetermined distance apart from each other.
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