发明名称 |
Recording medium having substrate with thickness dependent on numerical aperture of object lens, method of forming the optical medium and optical recording/reproducing apparatus |
摘要 |
A high density optical disc that can be driven changeably with the existent optical disc by the same driving apparatus. On the recording surface of the optical disc, a light transmissive layer with a thickness of about 0.2 to 0.4 mm is formed. The recording face is accessed by allowing a light beam with a wavelength of 395 to 425 nm in a spot shape to be irradiated onto it. Also, the light beam is converged in a spot shape by an objective lens having the numerical aperture of about 0.62 to 0.68. |
申请公布号 |
US2004160888(A1) |
申请公布日期 |
2004.08.19 |
申请号 |
US20040779681 |
申请日期 |
2004.02.18 |
申请人 |
LG ELECTRONICS, INC. |
发明人 |
KIM JIN YONG |
分类号 |
G11B7/08;G11B7/00;G11B7/125;G11B7/135;G11B7/24;(IPC1-7):G11B7/135 |
主分类号 |
G11B7/08 |
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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