公开(公告)号：US06925049B2

公开(公告)日：2005-08-02

申请号：US10092105

申请日：2002-03-06

申请人： Masatsugu Ogawa

发明人： Masatsugu Ogawa

IPC分类号： G11B7/24 ,  G11B7/007 ,  G11B27/19 ,  G11B27/24 ,  G11B7/05

CPC分类号： G11B27/24 ,  G11B7/007 ,  G11B2220/216 ,  G11B2220/218 ,  G11B2220/2525 ,  G11B2220/2529 ,  G11B2220/2545 ,  G11B2220/2562

摘要： In a wobble-format type optical recording medium 10 involving a guide groove 11 wherein the guide groove is allowed to meander over substantially the whole length thereof to form wobble, and wobbled intermittent sections 12 where there are no meandrous area are placed at predetermined positions in the wobble; a first wobbled intermittent section 12a for determining reference position is disposed at at least one reference position A in the optical recording medium, and furthermore, a second wobbled intermittent section 12b is disposed selectively at each predetermined position B apart from each reference position by a predetermined distance.

摘要翻译： 在包括引导槽11的摆动格式型光学记录介质10中，其中允许引导槽在其整个长度上曲折以形成摆动，并且在没有蜿蜒的区域的摆动间歇部分12被放置在 摇摆 用于确定基准位置的第一摆动间歇部分12a设置在光学记录介质中的至少一个基准位置A处，此外，第二摆动间歇部分12b选择性地设置在每个参考位置之外的每个预定位置B处， 预定距离。

公开(公告)号：US20050117504A1

公开(公告)日：2005-06-02

申请号：US10997897

申请日：2004-11-29

申请人： Masatsugu Ogawa ,  Shuichi Ohkubo

发明人： Masatsugu Ogawa ,  Shuichi Ohkubo

IPC分类号： G11B7/00 ,  G11B7/005 ,  G11B7/095 ,  G11B20/10

CPC分类号： G11B7/0956 ,  G11B7/005 ,  G11B20/10009

摘要： In a method of obtaining a reproduction signal with good quality from a data recording medium, two actual signals are generated as first and second signals I1 and I2 from detection signals obtained from the data recording medium. A coefficient k which has linear correlation with a tilt is calculated based on the first and second signals I1 and I2. A reproduction signal in which influence of the tilt is eliminated, is reproduced by using the coefficient k and the first and second signals I1 and I2.

摘要翻译： 在从数据记录介质获得质量良好的再现信号的方法中，从获得的检测信号中产生两个实际信号作为第一和第二信号I 1和I 2 2 从数据记录介质。 基于第一和第二信号I 1和I 2 2计算与倾斜线性相关的系数k。 通过使用系数k和第一和第二信号I 1和I 2 2再现消除了倾斜影响的再现信号。

公开(公告)号：US5917799A

公开(公告)日：1999-06-29

申请号：US82372

申请日：1998-05-20

申请人： Masafumi Nakada ,  Masatsugu Ogawa

发明人： Masafumi Nakada ,  Masatsugu Ogawa

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B11/10515

摘要： In a magneto-optical recording medium which includes a guide groove portion having a land area, a groove area, and a boundary area between the land area and the groove area, both of the land area and the groove area may have a V-shaped cross-section. At least one of the land area and the groove area may have a protruding portion which is formed in parallel to the guide groove portion and which has a width which is less than a half of a wavelength of a read laser beam.

摘要翻译： 在包括具有焊盘区域，沟槽区域和焊盘区域和沟槽区域之间的边界区域的引导槽部分的磁光记录介质中，焊盘区域和沟槽区域两者可以具有V形 横截面。 所述区域区域和所述沟槽区域中的至少一个可以具有与所述引导槽部平行的宽度小于读取的激光的波长的一半的突出部。

公开(公告)号：US5781524A

公开(公告)日：1998-07-14

申请号：US785169

申请日：1997-01-13

申请人： Masatsugu Ogawa

发明人： Masatsugu Ogawa

IPC分类号： G11B11/10 ,  G11B7/135 ,  G11B11/105 ,  G11B7/00

CPC分类号： G11B11/10543 ,  G11B7/1365 ,  G11B7/1369

摘要： A magneto-optical (MO) head has a pair of Faraday rotators between a polarizing beam splitter (PBS) and an objective lens for focusing light onto a MO disk. The pair of Faraday rotators rotate the direction of polarization of the light by 90.degree. or pass the same as it is depending on the data area where data are read by the optical head. This enables the MO head for reproducing data recorded by a land-groove technique to reduce output level difference and cross-talk between a land area and a groove area, thereby improving C/N of the reproduced signal.

摘要翻译： 磁光（MO）头在偏振分束器（PBS）和用于将光聚焦到MO盘上的物镜之间具有一对法拉第旋转器。 一对法拉第旋转器将光的偏振方向旋转90度，或根据光学头读取数据的数据区域相同。 这使得MO头用于再现通过纹间沟技术记录的数据，以减小纹间区域和凹槽区域之间的输出电平差和串扰，从而改善再现信号的C / N。

公开(公告)号：US5724339A

公开(公告)日：1998-03-03

申请号：US621478

申请日：1996-03-25

申请人： Masatsugu Ogawa

发明人： Masatsugu Ogawa

IPC分类号： G11B11/10 ,  G11B7/005 ,  G11B7/007 ,  G11B7/013 ,  G11B7/24 ,  G11B11/105

CPC分类号： G11B7/24085 ,  G11B7/005 ,  G11B7/24 ,  G11B7/24088 ,  G11B7/24079

摘要： The present invention provides a light-reproduction medium, data stored therein being reproduced by detecting light transmitted therethrough and/or light reflected therefrom, including (a) a substrate formed on a surface thereof with at least two recording pits having different level from the surface of the substrate, each of the recording pits having a cross-section selected from at least two different shapes, the cross-section being defined as viewed in a direction perpendicular to a direction in which the light-reproduction medium is moved relative to an optical head, and (b) a magnetic film formed on the surface of the substrate. The present invention provides high density without improving mastering technology. That is, 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, driving method and an optical head structure, resulting in significantly increased capacity of an optical disc or an optical card.

摘要翻译： 本发明提供了一种光再现介质，其中存储的数据通过检测透过其的光和/或从其反射的光而被再现，包括（a）在其表面上形成有与表面不同的至少两个记录凹坑的基底 每个记录凹坑具有选自至少两种不同形状的横截面，该横截面被定义为在与光再现介质相对于光学方向移动的方向垂直的方向上观察 头部，（b）形成在基板表面上的磁性膜。 本发明提供高密度而不改进母盘制作技术。 也就是说，本发明提供一种具有比常规CD-ROM大几倍的存储密度的光再现介质，而不改变CD-ROM制造技术，驱动方法和光头结构，导致光盘的容量显着增加或 一张光卡。