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119 条记录 (耗时 0.043 秒)

    Optical recording and reproducing apparatus with abnormality detector
    98.
    发明授权
    Optical recording and reproducing apparatus with abnormality detector 失效
    具有异常检测器的光学记录和再现装置

    公开(公告)号：US4800548A

    公开(公告)日：1989-01-24

    申请号：US64605

    申请日：1987-06-22

    申请人： Kenji Koishi ,  Tamotsu Matsuo

    发明人： Kenji Koishi ,  Tamotsu Matsuo

    IPC分类号： G11B7/004 ,  G11B19/04 ,  G11B27/36

    CPC分类号： G11B19/04 ,  G11B27/36 ,  G11B7/004

    摘要： An optical recording and reproducing apparatus which records information on the optical disc to reproduce the information from the optical disc. It is necessary to detect the abnormal condition, when the abnormal condition has been caused while the information is recording on the optical disc, to change the optical power level of the laser light source into the non-recording condition so that the abnormal data may not be recorded on the optical disc. The track skipping which is not intended, unnecessary during the recording operation, the condition which is not the record power with the record power level being set, the motor which is rotating the optical disc causes the abnormal rotation, are the abnormal condition during the recording operation. The diagnosis function is important which confirms the positive operation of the abnormal condition detection during the recording operation, and of the write protection, because the abnormal condition during the recording operation considerably lowers the reliability of the data recorded on the optical disc.

    Drive circuit for semiconductor laser of opto-electric recording/playback apparatus
    99.
    发明授权
    Drive circuit for semiconductor laser of opto-electric recording/playback apparatus 失效
    光电记录/播放装置的半导体激光器的驱动电路

    公开(公告)号：US4754460A

    公开(公告)日：1988-06-28

    申请号：US4586

    申请日：1987-01-20

    申请人： Mari Kimura ,  Tamotsu Matsuo ,  Kenji Koishi

    发明人： Mari Kimura ,  Tamotsu Matsuo ,  Kenji Koishi

    IPC分类号： G11B7/00 ,  G11B7/004 ,  G11B7/125 ,  G11B19/02 ,  G11B19/04 ,  H01S3/00

    CPC分类号： G11B19/02 ,  G11B19/04

    摘要： A drive circuit for a semiconductor laser in an apparatus for recording/playback of data utilizing an optical recording medium includes circuit elements for establishing recording and playback operating conditions respectively in which output light levels from the laser are set to suitable values for recording and playback, and for controlling the laser output light levels during recording and playback operation at fixed values, and moreover for modulating the laser output light in accordance with a recording signal during recording operation. A changeover control signal which executes changeover between the recording and playback conditions is derived such as to begin in coincidence with the start of a leading pulse of a series of recording signal pulses, and to end immediately following the final recording signal pulse, to thereby avoid excessive laser drive current levels following changeover between playback and recording operating conditions.

    摘要翻译： 用于使用光记录介质记录/重放数据的设备中的半导体激光器的驱动电路包括用于建立记录和重放操作条件的电路元件，其中来自激光器的输出光电平被设置为适当的记录和重放值， 并且用于在记录和重放操作期间以固定值控制激光输出光电平，并且还用于在记录操作期间根据记录信号调制激光输出光。 导出执行记录和重放条件之间的切换的切换控制信号，以便与一系列记录信号脉冲的前导脉冲的开始一致开始，并且紧跟在最后记录信号脉冲之后结束，从而避免 在重放和记录操作条件之间切换之后激光驱动电流过大。