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    • 1. 发明授权
    • Disc apparatus
    • 盘装置
    • US6041029A
    • 2000-03-21
    • US32500
    • 1998-02-26
    • Michihiko IidaTetsuji KawashimaShoji SatoShozo Masuda
    • Michihiko IidaTetsuji KawashimaShoji SatoShozo Masuda
    • G11B7/00G11B7/005G11B7/007G11B20/14G11B27/30
    • G11B7/00745G11B20/1403G11B27/3027G11B7/005
    • A disc apparatus in which recorded data can be correctly reproduced despite occurrence of a low-reliability area at a specified position on a disc on which synchronization signals are recorded. A comparison error signal between the playback RF signals read out from a disc 100 and channel clocks PLCK enters a VCO 15 via a phase/frequency comparator 12. A VCO 15 generates PLCK at a frequency corresponding to the voltage of the comparison error signal. A data detection unit 16 takes out data from the playback RF signals. If a Sync pattern detection interpolation unit 17 detects the Sync pattern correctly from this data, the above comparison error signal is directly fed to the VCO 15 and, if otherwise, the sample-and-hold unit 14 holds the voltage of the comparison error signal by control signals from a controller 20. At this time, interpolation of the Sync patterns by the Sync pattern detection interpolation unit 17 is discontinued.
    • 尽管在记录有同步信号的盘上的指定位置发生低可靠性区域,但是可以正确地再现记录数据的盘装置。 从盘100读出的重放RF信号和通道时钟PLCK之间的比较误差信号经由相位/频率比较器12进入VCO 15. VCO 15以对应于比较误差信号的电压的频率产生PLCK。 数据检测单元16从重放RF信号中取出数据。 如果同步模式检测内插单元17从该数据正确地检测到同步模式,则将上述比较误差信号直接馈送到VCO 15,否则采样保持单元14保持比较误差信号的电压 此时,同步模式检测内插单元17的同步模式的插值被中断。
    • 6. 发明授权
    • Disk drive and method of controlling the focus
    • 磁盘驱动器和控制焦点的方法
    • US6061310A
    • 2000-05-09
    • US64259
    • 1998-04-22
    • Michihiko Iida
    • Michihiko Iida
    • G11B7/00G11B7/085G11B7/09
    • G11B7/08511G11B2007/0013G11B7/0945
    • The invention provides an apparatus for reproducing data recorded on a disk-shaped storage medium including a plurality of signal layers, the apparatus being capable of switching the location of an objective lens through which a light beam is projected onto the disk-shaped storage medium, from a location where the objective lens focuses the light beam onto a first signal layer to a location where the objective lens focuses the light beam onto a second signal layer, the apparatus comprising: movement control means for moving the objective lens by outputting a movement control signal having a predetermined level at a predetermined time so that the objective lens can reach a location within a range which allows the objective lens to be drawn to a just focusing position associated with the second signal layer; velocity detection means for detecting the velocity of the objective lens from the waveform of a focusing error signal at a predetermined time prior to a zero-crossing time at which the objective lens is located at the just focusing position associated with the second signal layer; and focus drawing means for closing a focusing servo loop at a time corresponding to the above-described velocity. With the apparatus according to the invention, it is possible to perform the focus jumping operation in a reliable fashion regardless of conditions such as the position in which a disk drive is placed, the sensitivity variation of a biaxial driver, and the variation in the distance between layers of the disk.
    • 本发明提供了一种用于再现记录在包括多个信号层的盘形存储介质上的数据的装置,该装置能够将光束投射到盘形存储介质上的物镜的位置切换, 从物镜将光束聚焦到第一信号层的位置到物镜将光束聚焦到第二信号层上的位置,该装置包括:移动控制装置,用于通过输出移动控制来移动物镜 信号在预定时间具有预定电平,使得物镜可以到达允许物镜被吸引到与第二信号层相关联的正好聚焦位置的范围内的位置; 速度检测装置,用于在物镜位于与第二信号层相关联的刚好聚焦位置的零交叉时间之前的预定时间从聚焦误差信号的波形检测物镜的速度; 以及用于在对应于上述速度的时间闭合聚焦伺服回路的聚焦绘图装置。 利用根据本发明的装置,可以以可靠的方式执行聚焦跳跃操作,而不管诸如放置盘驱动器的位置,双轴驱动器的灵敏度变化以及距离的变化等条件 在磁盘的层之间。