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    • 113. 发明授权
    • Multilayer recording medium and method of manufacturing the same
    • 多层记录介质及其制造方法
    • US07567493B2
    • 2009-07-28
    • US11290593
    • 2005-12-01
    • Tao HongChong-sam ChungTae-kyung KimWoo-seok Choi
    • Tao HongChong-sam ChungTae-kyung KimWoo-seok Choi
    • G11B7/20G11B7/26
    • G11B7/26G11B7/24038G11B7/268
    • A multilayer recording medium that prevents deterioration of a signal characteristic due to a mirror effect that may occur between recording layers and a method of manufacturing the same, the multilayer recording medium having at least two recording layers, wherein a thickness of at least one spacer layer between adjacent recording layers is different from a thickness of the other spacer layers such that a beam focusing on a recording layer is prevented from focusing on another recording layer corresponding to a mirror layer due to reflection. In the multilayer recording medium, a mirror effect is greatly reduced. In addition, the thickness of only a spacer layer exerting the most significant influence on the mirror effect is changed to prevent the deterioration of signal quality due to the mirror effect, and therefore, the structure of a multilayer recording medium is simplified.
    • 一种防止由于记录层之间可能发生的镜面效应引起的信号特性劣化的多层记录介质及其制造方法,所述多层记录介质具有至少两个记录层,其中至少一个间隔层的厚度 相邻记录层之间的距离不同于其它间隔层的厚度,从而防止聚焦在记录层上的光束聚焦于由于反射而对应于镜层的另一个记录层。 在多层记录介质中,镜面效果大大降低。 此外,仅改变对镜效应产生最重要影响的间隔层的厚度,以防止由于镜面效应引起的信号质量的劣化,因此简化了多层记录介质的结构。
    • 120. 发明授权
    • Optical disc apparatus and method of reproducing a wobble signal
    • 光盘装置和再现摆动信号的方法
    • US07266074B2
    • 2007-09-04
    • US10183969
    • 2002-06-28
    • Tae-kyung KimYoung-man AhnJong-bae KimJin-kyung LeeChong-sam Chung
    • Tae-kyung KimYoung-man AhnJong-bae KimJin-kyung LeeChong-sam Chung
    • G11B7/005
    • G11B27/24G11B7/0053G11B7/131G11B7/1381G11B7/24082G11B20/1403G11B27/3027G11B2220/216G11B2220/218G11B2220/2545G11B2220/2562
    • An optical disc apparatus and a wobble signal detection method in which a light beam projected onto an optical disc and reflected by the optical disc is divided into at least four light regions in the direction corresponding to the radial direction of the optical disc to detect the light regions, and a wobble signal is detected by performing a subtraction on first and second difference signals, the first difference signal obtained by performing a subtraction on detection signals for the inner light regions of the divided and/or detected light beam and the second difference signal obtained by performing a subtraction on detection signals for the outer light regions of the divided and/or detected light beam. Accordingly, when a wobble signal is reproduced from an optical disc manufactured by a wobble modulation manner, a wobble signal is prevented from being degraded due to the interference (cross talk) from the wobbles of adjacent tracks, even though the track pitch of the optical disc is reduced to improve the recording density.
    • 一种光盘装置和摆动信号检测方法,其中投射到光盘上并被光盘反射的光束在与光盘的径向对应的方向上被划分为至少四个光区域,以检测光 区域,并且通过对第一和第二差分信号执行减法来检测摆动信号,通过对分割和/或检测光束的内部光区域的检测信号进行减法而得到的第一差分信号和第二差分信号 通过对分割和/或检测到的光束的外部光区域的检测信号进行减法而获得。 因此,当从由摆动调制方式制造的光盘再现摆动信号时,由于相邻轨道的摆动引起的干扰(串扰),摆动信号被防止掉,即使光学信号的轨道间距 减少光盘以提高记录密度。