发明名称 |
High-density disk recording medium having an asymmetrically-shaped center hole and manufacturing method thereof |
摘要 |
The present invention relates to a high-density disk that is structured to prevent a collision of an optical pickup's objective lens with the high-density disk if the disk is placed upside down in a disk device that is able to record and reproduce signals to/from the high-density disk. A high-density disk recording medium according to the present invention is structured such that, wherein a recording layer having high-density pit patterns is offset from a center plane of disk thickness, a center hole of the disk recording medium is asymmetric in shape with respect to the center plane where, for example, both entrances of the center hole have mutually different diameters. <IMAGE> |
申请公布号 |
EP1258873(A3) |
申请公布日期 |
2004.09.08 |
申请号 |
EP20020010721 |
申请日期 |
2002.05.14 |
申请人 |
LG ELECTRONICS INC. |
发明人 |
KIM, JIN YONG;PARK, KYUNG CHAN |
分类号 |
G11B7/24;G11B7/26;G11B17/028;G11B23/00 |
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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