发明名称 |
Optical disk and optical disk system with numerical aperture of objective lens related to protective layer thickness of optical disk |
摘要 |
An optical disc system uses a rewritable optical disc with a light-transmitting cover and an objective lens for bundling or focusing a light beam on a recording layer of the optical disc in order to perform recording and/or reproducing of information. The recording layer is formed of a phase-change material. The thickness of the light-transmitting cover falls within the range of 0.05 mm to 0.6 mm, the numerical aperture (NA) of the objective lens is set to fall within the range of 0.55 to 1.10, and the wavelength of the light beam is selected to be between 100 nm to 780 nm.
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申请公布号 |
US5910932(A) |
申请公布日期 |
1999.06.08 |
申请号 |
US19970928812 |
申请日期 |
1997.09.12 |
申请人 |
SONY CORPORATION |
发明人 |
WATANABE, TETSU;AOKI, YOSHIO |
分类号 |
G11B7/007;G11B7/135;G11B7/24;G11B7/243;G11B11/105;(IPC1-7):G11B11/00 |
主分类号 |
G11B7/007 |
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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