发明名称 |
Method for manufacturing discoid optical record medium and discoid optical record medium |
摘要 |
A disc-shaped optical recording medium formed by carrying out a film formation process on a disc-shaped substrate material and completed by forming a center hole at the last step is manufactured in a manner such that no eccentricity will occur when the recording medium is loaded onto a drive. At the last step of an optical disc manufacturing process, i.e., at the time of opening a hole in the center part 26 of the disc-shaped substrate material 12 formed with at least a resin layer on one side thereof, the center part 26 is removed in a manner such that the diameter of the chucking center hole 28 is larger on the disc-shaped substrate material 12 side than on the light transmitting resin layer 22 side of the disc-shaped optical recording medium 30, thereby manufacturing the disc-shaped optical recording medium 30.
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申请公布号 |
US2005007945(A1) |
申请公布日期 |
2005.01.13 |
申请号 |
US20040501508 |
申请日期 |
2004.08.27 |
申请人 |
USAMI MAMORU;USHIDA TOMOKI;YAMAGA KENJI;SAKAI YOSHIMI |
发明人 |
USAMI MAMORU;USHIDA TOMOKI;YAMAGA KENJI;SAKAI YOSHIMI |
分类号 |
G11B7/24;G11B7/00;G11B7/26;G11B23/00;(IPC1-7):G11B7/24 |
主分类号 |
G11B7/24 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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