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    • 80. 发明申请
    • Recording/reproduction apparatus, recording/reproduction method and information recording medium
    • 记录/再现装置,记录/再现方法和信息记录介质
    • US20050276177A1
    • 2005-12-15
    • US11200570
    • 2005-08-10
    • Kenichi Nishiuchi
    • Kenichi Nishiuchi
    • G11B7/00G11B7/09G11B7/095G11B21/02
    • G11B7/0941G11B7/0946G11B2007/0013
    • A recording and reproduction apparatus for a recording medium including a plurality of information layers includes a focusing signal generation section for generating focusing signals F+and F−in accordance with a light beam reflected by the recording medium; a focusing control section for generating a focusing error signal in accordance with a difference between the focusing signals F+and F−, and performing focusing control for maintaining a distance between a focal point of the light beam and a target information layer within a prescribed tolerable range; and a gain setting section for setting a focusing servo gain in accordance with the focusing error signal. The focusing signal generation section generates the focusing signals F+ F− so that values of components thereof based on the light beam reflected by an information layer other than the target information layer are substantially equal while focusing control is being performed.
    • 用于包括多个信息层的记录介质的记录和再现装置包括:聚焦信号产生部分,用于根据由记录介质反射的光束产生聚焦信号F +和F-; 聚焦控制部分,用于根据聚焦信号F +和F-之间的差异产生聚焦误差信号,并执行聚焦控制,以将光束的焦点与目标信息层之间的距离保持在规定的可容许的范围内 范围; 以及增益设定部,用于根据聚焦误差信号设定聚焦伺服增益。 聚焦信号生成部生成聚焦信号F + F-,使得在进行聚焦控制的同时,基于由目标信息层以外的信息层反射的光束的分量的值基本相等。