发明名称 |
Rewritable optical recording medium, recording method on the same, and optical disc recording/retrieving apparatus |
摘要 |
In a rewritable compact disc having a wobble groove on a substrate, crystal and amorphous states of a phase-change recording layer are an unrecorded/erased state and a recorded state, respectively. When the recording layer is exposed to recording light, amorphous marks assuming the recorded state are formed. At any of 2-, 4- and 8-times velocities with respect to a reference velocity (1-times velocity) whose linear velocity is 1.2-1.4 m/s, modulation m11 of a recorded signal when the recording light of approximately 780 nm in wavelength irradiates the recording layer via an optical system with NA=0.5 or 0.55 is 60-80%. A topmost level Rtop of reflectivity of the eye pattern of the recorded signal during retrieving at the 1-times velocity is 15-25%, and a jitter of the individual length of marks and inter-mark spaces during retrieving at 1-times velocity is 35 ns or less. Recording at 8-times or higher velocities is thereby realized without any risk of impairing the read-compatibility with the conventional CD-RW specifications at least at 4-times velocity.
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申请公布号 |
US2004246835(A1) |
申请公布日期 |
2004.12.09 |
申请号 |
US20040866216 |
申请日期 |
2004.06.10 |
申请人 |
NOBUKUNI NATSUKO;OHNO TAKASHI;KUBO MASAE;HORIE MICHIKAZU |
发明人 |
NOBUKUNI NATSUKO;OHNO TAKASHI;KUBO MASAE;HORIE MICHIKAZU |
分类号 |
G11B7/0045;G11B7/0055;G11B7/006;G11B7/007;G11B7/085;G11B7/125;G11B7/126;G11B7/24;G11B7/243;G11B20/12;G11B20/14;G11B27/034;G11B27/036;G11B27/19;G11B27/24;G11B27/30;(IPC1-7):G11B5/09 |
主分类号 |
G11B7/0045 |
代理机构 |
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代理人 |
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地址 |
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