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    • 8. 发明申请
    • OPTICAL DISC APPARATUS AND SIGNAL GENERATION METHOD
    • 光盘设备和信号发生方法
    • US20100027403A1
    • 2010-02-04
    • US12511566
    • 2009-07-29
    • Goro FujitaHirotaka MiyamotoKimihiro SaitoKunihiko Hayashi
    • Goro FujitaHirotaka MiyamotoKimihiro SaitoKunihiko Hayashi
    • G11B7/135
    • G11B7/08511G11B7/00452G11B7/083
    • An optical disc apparatus includes a light separator configured to separate a light beam emitted from a light source into a main beam and a sub-beam, an objective lens configured to, when the light beam is condensed and irradiated to an optical disc having a uniform recording layer in which a track is formed by record marks, irradiate at least part of the sub-beam to an area where the main beam is not irradiated in a radial direction which is defined as a direction of radius of the optical disc, and a signal generating unit configured to generate a mark layer distance signal, representing a distance between a focus of the light beam and a mark layer to which the track belongs, based on a return light beam resulting from at least one of the main beam and the sub-beam, which has been irradiated to the track.
    • 光盘装置包括:光分离器,被配置为将从光源发射的光束分离成主光束和子光束;物镜,被配置为当光束被冷凝并照射到具有均匀的光盘时 通过记录标记形成轨道的记录层,将所述子光束的至少一部分照射到被定义为所述光盘的半径方向的径向的所述主光束不被照射的区域,以及 信号生成单元,被配置为基于从所述主光束和所述子像素中的至少一个产生的返回光来生成表示所述光束的焦点与所述轨道所属的标记层之间的距离的标记层距离信号 光束已被照射到轨道上。