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    System for preventing the overwriting of previously optically recorded data and for reading optically recorded data during writing
    1.
    发明授权
    System for preventing the overwriting of previously optically recorded data and for reading optically recorded data during writing 失效
    用于防止在写入期间重写先前光学记录数据和读取光学记录数据的系统

    公开(公告)号：US4631706A

    公开(公告)日：1986-12-23

    申请号：US672559

    申请日：1984-11-19

    申请人： Glenn D. Batalden ,  Duane W. Baxter ,  Neil R. Davie

    发明人： Glenn D. Batalden ,  Duane W. Baxter ,  Neil R. Davie

    IPC分类号： G11B7/00 ,  G11B7/0045 ,  G11B7/125 ,  G11B7/13 ,  G11B19/04 ,  G11B27/36 ,  G11C13/00

    CPC分类号： G11B7/126 ,  G11B19/04 ,  G11B27/36 ,  G11B7/0045 ,  G11B7/13

    摘要： An optical file system in which a command to store data results in a write operation in the next available storage position. A single optical path is used for both reading and writing. By dividing the detector in two equal parts along the direction of relative movement, it is possible to determine whether data has been written at a position which is in advance of the center of the area viewed by the detector. The write operation is conditioned on the output of the first part of the detector. Since the first part of the detector gives advance warning on the status of the oncoming data position, it is possible to switch from reading to writing without the requirement for a wasted revolution or wasted space. By dividing the signal resulting from a change of reflectance sensed during a write operation by a measure of the intensity of the write laser a read signal free of the write modulation is obtained.

    摘要翻译： 其中存储数据的命令导致下一个可用存储位置的写入操作的光学文件系统。 单一光路用于读写。 通过沿着相对移动方向将检测器分成两个相等的部分，可以确定数据是否已经被写入位于由检测器观察的区域的中心之前的位置。 写入操作根据检测器的第一部分的输出。 由于检测器的第一部分对即将到来的数据位置的状态提供预警，可以从读取切换到写入，而不需要浪费革命或浪费空间。 通过将在写入操作期间感测的反射率的变化产生的信号除以写入激光器的强度的测量，获得了没有写入调制的读取信号。