发明名称 |
REWRITABLE OPTICAL RECORDING MEDIUM AND OPTICAL RECORDING METHOD |
摘要 |
The present invention provides CD-RW which makes high velocity recording at a level of at least 24-times velocity possible, rewritable DVD which makes high velocity recording at a level of at least 6-times velocity possible, and a recording method therefor, while maintaining interchangeability with conventional CD-RW standards and rewritable DVD standards. <??>A rewritable optical recording medium comprising a substrate and a phase-change type recording layer, wherein a portion in a crystalline state corresponds to an unrecorded or erased state, and a portion in an amorphous state correspond to a recorded state, to record EFM modulated information by forming amorphous marks by irradiating the recording layer with a recording laser beam, and wherein recording is carried out by irradiating a recording laser beam having a wavelength of about 780 nm through an optical system having a numerical aperture NA of 0.5 or 0.55, at 24-times velocity or 32-times velocity of the reference velocity, where the reference velocity (1-time velocity) is a linear velocity of from 1.2 m/s to 1.4 m/s, modulation m11 of record signals is from 60% to 80%, the top value Rtop of the reflectivity of the high pattern is from 15% to 25%, and jitters are at most 35 nsec. <IMAGE> |
申请公布号 |
EP1475784(A4) |
申请公布日期 |
2012.03.14 |
申请号 |
EP20030705130 |
申请日期 |
2003.02.13 |
申请人 |
MITSUBISHI KAGAKU MEDIA CO., LTD. |
发明人 |
OHNO, TAKASHI;KUBO, MASAE;HORIE, MICHIKAZU;MIZUNO, MASAAKI;HOSHINO, HIROYUKI;OKAMURO, AKIO |
分类号 |
G11B7/24;G11B7/0045;G11B7/006;G11B7/125;G11B7/243;G11B7/26 |
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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