发明名称 |
Optical disk and optical disk apparatus |
摘要 |
An optical disk comprises a substrate, and a recording layer which is formed on the substrate and on which information is recorded at specific pitches in the form of pit trains, wherein the information is reproduced by projecting a light beam via an object lens, and when the wavelength of the light beam is lambda mu m and the numerical aperture of the object lens is NA, the track pitch is set in the range of (0.72 to 0.8)x lambda /NA/1.14 mu m, and each of the pits has a trapezoid cross section whose upper width is in the range of (0.3 to 0.5)x/NA/1.14 mu m and whose lower width is in the range of (0.2 to 0.32)x lambda /NA/1.14 mu m or whose inner wall has an angle of 30 DEG to 70 DEG .
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申请公布号 |
US5592464(A) |
申请公布日期 |
1997.01.07 |
申请号 |
US19950475494 |
申请日期 |
1995.06.07 |
申请人 |
KABUSHIKI KAISHA TOSHIBA |
发明人 |
SUGAYA, TOSHIHIRO;HONGUH, YOSHINORI |
分类号 |
G11B7/005;G11B7/007;G11B7/013;G11B7/09;G11B7/24;G11B7/24038;G11B7/24079;G11B7/24085;H04N5/85;H04N9/804;H04N9/87;(IPC1-7):G11B7/24 |
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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