发明名称 |
Optical disk and method of magnetically separating tracks of the optical disk |
摘要 |
On a disk-shaped substrate in which a predetermined region ranging in a radial direction is used as a data region for recording/reproduction, a first dielectric layer, a magnetic layer, and a second dielectric layer are provided. The data region includes recording/reproducing tracks composed of a plurality of discontinuous grooves or lands ranging from an innermost track to an outermost track. Magnetic anisotropy of each of magnetic layers positioned between the respective recording/reproducing tracks is reduced to a level lower than that of magnetic anisotropy of the magnetic layers positioned on the recording/reproducing tracks, so that the magnetic layers are magnetically separated only between the recording/reproducing tracks and not magnetically separated in flat portions without grooves. Thus, reflectance is even in the flat portions, thereby allowing tilt detection.
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申请公布号 |
US2002154580(A1) |
申请公布日期 |
2002.10.24 |
申请号 |
US20020125143 |
申请日期 |
2002.04.18 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
BIRUKAWA MASAHIRO;HIROKI TOMOYUKI;HOZUMI YASUSHI |
分类号 |
G11B7/007;G11B11/105;(IPC1-7):G11B11/00 |
主分类号 |
G11B7/007 |
代理机构 |
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