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    • 12. 发明授权
    • Recording medium, method and apparatus for recording, and method and apparatus for reproducing
    • 用于记录的记录介质,方法和装置,以及用于再现的方法和装置
    • US07123574B2
    • 2006-10-17
    • US11242771
    • 2005-10-04
    • Mamoru ShojiAtsushi NakamuraTakashi IshidaYuji Hisakado
    • Mamoru ShojiAtsushi NakamuraTakashi IshidaYuji Hisakado
    • G11B7/24G11B5/09
    • G11B19/125G11B7/0045G11B7/005G11B7/007G11B7/00718G11B19/128G11B2007/0013
    • In a recording medium which is circular and has first and second recording layers, the first and second recording layers each include one or more first tracks extending concentrically or spirally and one or more second tracks extending concentrically or spirally, each of the one or more first tracks and the one or more second tracks includes a plurality of first sectors and a plurality of second sectors, each of the plurality of first sectors includes first and second regions, each of the plurality of second sectors includes third and fourth regions, first and second grooves are formed in each of the second and fourth regions, the first and second grooves extending concentrically or spirally and oscillating sinusoidally, oscillation of the first groove has a first oscillation characteristic at a first prescribed position in the second region, oscillation of the second groove has a second oscillation characteristic at a second prescribed position in the fourth region, and the first and second oscillation characteristics are different from each other.
    • 在圆形并具有第一和第二记录层的记录介质中,第一和第二记录层各自包括同心或螺旋状延伸的一个或多个第一轨道和同心或螺旋地延伸的一个或多个第二轨道,一个或多个第一记录层 轨道,并且一个或多个第二轨道包括多个第一扇区和多个第二扇区,多个第一扇区中的每一个包括第一和第二区域,多个第二扇区中的每一个包括第三和第四区域,第一和第二区域 在第二和第四区域的每一个中形成有槽,第一和第二槽同心或螺旋地延伸并正弦振荡,第一槽的振荡在第二区域的第一规定位置处具有第一振荡特性,第二槽的振荡 在第四区域的第二规定位置具有第二振荡特性, 第二振荡特性彼此不同。