发明名称 |
Coated disk substrate having a small thickness region |
摘要 |
A disk substrate for use in manufacturing a recording disk therefrom has an outer non-recording area, recording area, inner non-recording area and a central opening. The inner non-recording area includes a small thickness region having a thickness 70 to 90% of the thickness of the recording area and occupying an area 3 to 30% of the entire disk area including the central opening. The outer non-recording area has a large thickness region having a thickness larger than the thickness of the recording area. The disk substrate is free from warp and improves optical characteristics of the resultant disk.
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申请公布号 |
US5987003(A) |
申请公布日期 |
1999.11.16 |
申请号 |
US19970896168 |
申请日期 |
1997.07.17 |
申请人 |
MITSUBISHI CHEMICAL CORPORATION |
发明人 |
YOKOTA, SHOJI |
分类号 |
B29C45/26;G11B7/24;G11B7/26;G11B23/00;(IPC1-7):G11B3/70;G11B5/82 |
主分类号 |
B29C45/26 |
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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