发明名称 |
Optical recording medium and optical memory device |
摘要 |
The optical recording medium has sandwiched between protective layers a mask layer whose refractive index is changed in one part within a light spot when irradiated with a laser beam of 2 to 4 mW. In a region where the refractive index is changed or in other remaining regions, the difference in the amount of reflected light between the crystalline state and the amorphous state is so small that a reproduced signal is difficult to identify. By reducing the size of a portion where the reproduced signal can be seen, it is possible to read high-density recorded information.
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申请公布号 |
US6411591(B1) |
申请公布日期 |
2002.06.25 |
申请号 |
US20000485846 |
申请日期 |
2000.02.17 |
申请人 |
HITACHI, LTD.;HITACHI MAXELL, LTD. |
发明人 |
MORITANI KOICHI;HIROTSUNE AKEMI;TERAO MOTOYASU;MIYAUCHI YASUSHI;SHINTANI TOSHIMICHI;NAITO TAKASHI;NAMEKAWA TAKASHI;YAMAMOTO HIROKI |
分类号 |
G11B7/005;G11B7/24;G11B7/243;G11B7/257;(IPC1-7):G11B7/24;B32B3/02 |
主分类号 |
G11B7/005 |
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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