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    • 2. 发明公开
    • HOLOGRAM RECORDING/REPRODUCING DEVICE AND HOLOGRAM RECORDING MEDIUM
    • AUFZEICHNUNGS- UNDWIEDERGABEGERÄTFÜRHOLOGRAMM UND HOLOGRAPHISCHES AUFZEICHNUNGSMEDIUM
    • EP1562185A1
    • 2005-08-10
    • EP03741551.0
    • 2003-07-23
    • Pioneer Corporation
    • TACHIBANA, AkihiroTANAKA, SatoruITOH, YoshihisaKUBOTA, YoshiharaKURODA, KazuoSUGIURA, Satoshi
    • G11B7/0065
    • G11B7/0938G11B7/0065G11B7/083G11B7/1362
    • A holographic recording and reproducing apparatus comprises: a pickup for moving an objective lens that focuses a coherent light beam along a recording track on a holographic recording medium and for detecting reflected light from the recording track to perform focus- and tracking-servo control; a relative velocity determination unit for determining a relative velocity of a converging position of the objective lens with respect to the holographic recording medium; a driving unit for changing a relative position of the objective lens with respect to an optical path of the coherent light beam so as to make the relative velocity fall within a predetermined range at least during a predetermined period; and a control unit for performing recording or reproduction for a recording layer during the predetermined period. The holographic recording medium includes a plurality of markers used for positioning an optical interference pattern of the coherent light beam.
    • 一种全息记录和再现装置,包括:拾取器,用于移动物镜,其将相干光束沿着全息记录介质上的记录轨道聚焦,并用于检测来自记录轨道的反射光,以执行对焦和跟踪伺服控制; 相对速度确定单元,用于确定物镜相对于全息记录介质的会聚位置的相对速度; 驱动单元,用于相对于所述相干光束的光路改变所述物镜的相对位置,以使所述相对速度至少在预定时段期间落在预定范围内; 以及控制单元,用于在预定时间段内对记录层执行记录或再现。 全息记录介质包括用于定位相干光束的光学干涉图案的多个标记。
    • 3. 发明公开
    • OPTICAL DISC
    • OPTISCHERDATENTRÄGER
    • EP2133875A1
    • 2009-12-16
    • EP07740728.6
    • 2007-03-30
    • Pioneer Corporation
    • KURODA, KazuoMURAMATSU, EijiKITANO, Kazutoshi
    • G11B7/007
    • G11B7/24085G11B7/14
    • An optical disc (100) from which a plurality of pieces of information recorded along a track (9) by irradiating light that moves above the track relatively are reproduced in parallel. The optical disc has a disc substrate (1), and a recording layer (2) formed thereon. On the recording layer, a track is defined concentrically and two pit rows for carrying the plurality of pieces of information independently from each other are arranged along the track on the opposite sides thereof. At a specific position where the two pit rows are in a predetermined mutual relation and the plurality of pieces of information read out by irradiating light cannot be distinguished, at least one of two pit rows is shifted by a predetermined distance in the radial direction of the disc substrate by having the track as reference. Consequently, recording capacity can be increased relatively easily.
    • 通过并行地再现沿着轨道(9)记录的多条信息,通过相对地在轨道上方照射光而从其中再现多条信息的光盘(100)。 光盘具有盘基片(1)和形成在其上的记录层(2)。 在记录层上,同心地定义轨道,并且沿着相对侧的轨道布置用于彼此独立地携带多条信息的两个凹坑行。 在两个凹坑列处于预定的相互关系的特定位置,并且不能区分通过照射光读出的多条信息,两个凹坑列中的至少一个在径向方向上移位预定距离 通过使轨道作为参考来实现。 因此,可以相对容易地增加记录容量。