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21. 发明公开

EP1383117A3 Method of adjusting recording conditions, information recording medium and information recording device 有权转让
标题翻译：调整记录条件的方法，信息记录介质和信息记录装置
公开(公告)号：EP1383117A3
公开(公告)日：2004-10-13
申请号：EP03016229.1
申请日：2003-07-17
申请人： NEC CORPORATION
发明人： Ogawa, Masatsugu
IPC分类号： G11B7/125 , G11B7/007 , G11B7/006 , G11B7/0045
CPC分类号： G11B7/1267 , G11B7/00736
摘要： An 11T single signal and a 3T single signal are recorded on a DVD-RW at the optimum recording power P1 and a recording power P2 of an intensity of 85 % with relative to the optimum recording power P1, and then these signals are reproduced to calculate asymmetry values A1 and A2. If a difference (A1-A2) between both asymmetry values is equal to or greater than a reference value of 0.05, it is judged that a method using the asymmetry value is available for the OPC, and if the difference is less than a reference value of 0.05, it is judged that the method is not available. Then, the judgment result is recorded on the DVD-RW as a flag. A DVD drive judges whether or not the asymmetry value is used for the OPC (optimum power control) on the basis of the flag. Information can thereby be properly recorded irrespective of recording speed.
摘要翻译： 11T单信号和3T单信号以最佳记录功率P1和相对于最佳记录功率P1为85％的强度的记录功率P2记录在DVD-RW上，然后再现这些信号以计算不对称值A1和A2。如果两个不对称值之间的差值（A1-A2）等于或大于参考值0.05，则判断使用不对称值的方法可用于OPC，并且如果差值小于参考值为0.05，则判断该方法不可用。然后，将判断结果作为标志记录在DVD-RW上。 DVD驱动器基于标志判断是否将不对称值用于OPC（最佳功率控制）。无论记录速度如何，都可以正确记录信息。

22. 发明授权

EP0829866B1 Optical information recording medium 失效
标题翻译：光学信息记录介质
公开(公告)号：EP0829866B1
公开(公告)日：2003-12-03
申请号：EP97115925.6
申请日：1997-09-12
申请人： NEC CORPORATION
发明人： Okada, Mitsuya , Ogawa, Masatsugu
IPC分类号： G11B7/24 , G11B7/013 , G11B11/10
CPC分类号： G11B7/24085 , G11B7/0938 , G11B7/24 , G11B7/24079 , G11B7/243 , G11B7/246 , G11B7/257 , G11B7/258 , G11B11/10578 , G11B11/10584 , G11B2007/0133 , G11B2007/24306 , G11B2007/24312 , G11B2007/24314 , G11B2007/24316 , G11B2007/25706 , G11B2007/2571 , G11B2007/25715 , G11B2007/25716
摘要： Disclosed are an optical information recording medium for recording, reproducing and erasing information by emitting laser light with a wavelength in vacuum of lambda , which has: a transparent substrate through which the laser light can be transmitted; a high refractive-index layer which is formed on the transparent substrate; a guide groove for tracking which is formed on the high refractive-index layer; and a recording layer which is formed on the guide groove for tracking; wherein a width W of the guide groove for tracking and a refractive index na of the high refractive-index layer are so set that the following relation: W > lambda /(2xna) is obtained, and an optical information recording medium for reproducing information by emitting laser light with a wavelength in vacuum of lambda , which has: a transparent substrate through which the laser light can be transmitted; a high refractive-index layer which is formed on the transparent substrate; a concave-convex pit which is formed on the high refractive-index layer; and a reflection layer which is formed on the concave-convex pit; wherein a width Wp of the concave-convex pit and a refractive index na of the high refractive-index layer are so set that the following relation: Wp > lambda /(2xna) is obtained.

23. 发明公开

EP0829866A2 Optical information recording medium 失效
标题翻译： OptischerDatenaufzeichnungsträger
公开(公告)号：EP0829866A2
公开(公告)日：1998-03-18
申请号：EP97115925.6
申请日：1997-09-12
申请人： NEC CORPORATION
发明人： Okada, Mitsuya , Ogawa, Masatsugu
IPC分类号： G11B7/24
CPC分类号： G11B7/24085 , G11B7/0938 , G11B7/24 , G11B7/24079 , G11B7/243 , G11B7/246 , G11B7/257 , G11B7/258 , G11B11/10578 , G11B11/10584 , G11B2007/0133 , G11B2007/24306 , G11B2007/24312 , G11B2007/24314 , G11B2007/24316 , G11B2007/25706 , G11B2007/2571 , G11B2007/25715 , G11B2007/25716
摘要： Disclosed are an optical information recording medium for recording, reproducing and erasing information by emitting laser light with a wavelength in vacuum of λ, which has: a transparent substrate through which the laser light can be transmitted; a high refractive-index layer which is formed on the transparent substrate; a guide groove for tracking which is formed on the high refractive-index layer; and a recording layer which is formed on the guide groove for tracking; wherein a width W of the guide groove for tracking and a refractive index n a of the high refractive-index layer are so set that the following relation: W > λ/(2xn a ) is obtained, and an optical information recording medium for reproducing information by emitting laser light with a wavelength in vacuum of λ, which has: a transparent substrate through which the laser light can be transmitted; a high refractive-index layer which is formed on the transparent substrate; a concave-convex pit which is formed on the high refractive-index layer; and a reflection layer which is formed on the concave-convex pit; wherein a width W p of the concave-convex pit and a refractive index n a of the high refractive-index layer are so set that the following relation: W p > λ/(2xn a ) is obtained.
摘要翻译：公开了一种用于通过发射具有λ的真空中的波长的激光来记录，再现和擦除信息的光学信息记录介质，其具有：可透射激光的透明基板; 形成在透明基板上的高折射率层; 用于跟踪的导槽，其形成在高折射率层上; 以及形成在引导槽上用于跟踪的记录层; 其中用于跟踪的导向槽的宽度W和高折射率层的折射率na被设置为获得以下关系：W>λ/（2xna），以及用于通过以下方式再现信息的光学信息记录介质发射具有λ的真空中的波长的激光，该激光具有：可透射激光的透明基板; 形成在透明基板上的高折射率层; 形成在高折射率层上的凹凸坑; 以及形成在凹凸凹坑上的反射层; 其中凹凸坑的宽度Wp和高折射率层的折射率na被设定为获得以下关系：Wp>λ/（2xna）。

24. 发明公开

EP0735529A2 Optical reproduction medium and method of reproducing data stored therein 失效
标题翻译：用于再现数据的光学再现介质和方法在其上存储
公开(公告)号：EP0735529A2
公开(公告)日：1996-10-02
申请号：EP96302306.4
申请日：1996-04-01
申请人： NEC CORPORATION
发明人： Ogawa, Masatsugu
IPC分类号： G11B7/24 , G11B11/10 , G11B7/013 , G11B7/00 , G11B7/135
CPC分类号： G11B7/24085 , G11B7/005 , G11B7/24 , G11B7/24079 , G11B7/24088
摘要： The present invention provides an improved light-reproduction medium storing data therein to be reproduced by detecting light transmitted therethrough and/or light reflected therefrom. The light-reproduction medium comprises a substrate formed on a surface thereof with at least two recording pits, and may have (i.e. the phrase should read "...at least two recording pits, and may have a magnetic film (4)...") a magnetic film (4) formed on the surface of the substrate (1). The recording pits (2a,2b,2Aa,2Ab,2B,2Ca,2Cb,2Da,2Db) have different level from the surface of the substrate (1), each of the recording pits having a cross-section selected from at least two different shapes. The present invention provides a light-reproduction medium having memory density several times greater than a conventional CD-ROM without changing CD-ROM fabrication technique and an optical head structure, resulting in significantly increased capacity of an optical disc or an optical card.

25. 发明公开

EP1528559A1 Information playback method and apparatus 审中-公开
标题翻译：信息再现方法和设备
公开(公告)号：EP1528559A1
公开(公告)日：2005-05-04
申请号：EP04025755.2
申请日：2004-10-29
申请人： NEC CORPORATION
发明人： Ohkubo, Shuichi , Ogawa, Masatsugu
IPC分类号： G11B20/10 , H04L25/497
CPC分类号： G11B20/10009 , G11B20/10046 , G11B20/10055 , H04L25/03038
摘要： An information playback apparatus includes a first FIR filter, ideal signal generator, weighted equalization error calculator, and coefficient calculator. The first FIR filter generates an equalized waveform by equalizing, to a partial response waveform, a playback data string obtained by playing back a recorded signal recorded on an information recording medium. The ideal signal generator generates a target waveform serving as an equalization target. The weighted equalization error calculator calculates a data string by performing convolution computation for an equalization error which is a difference between the equalized waveform and the target waveform, on the basis of one of the playback data string and the equalized waveform input from the first FIR filter and the target waveform input from the ideal signal generator. The coefficient calculator calculates a tap coefficient for the first FIR filter on the basis of the data string input from the weighted equalization error calculator, and outputs the tap coefficient to the first FIR filter. An information playback method is also disclosed.

26. 发明授权

EP0735529B1 Optical reproduction medium and method of reproducing data stored therein 失效
标题翻译：用于再现数据的光学再现介质和方法在其上存储
公开(公告)号：EP0735529B1
公开(公告)日：2002-01-30
申请号：EP96302306.4
申请日：1996-04-01
申请人： NEC CORPORATION
发明人： Ogawa, Masatsugu
IPC分类号： G11B7/24 , G11B11/10 , G11B7/013 , G11B7/00 , G11B7/135 , G11B7/007
CPC分类号： G11B7/24085 , G11B7/005 , G11B7/24 , G11B7/24079 , G11B7/24088

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