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    • 1. 发明授权
    • Disk apparatus for focusing and adjusting a laser beam
    • 用于聚焦和调整激光束的光盘装置
    • US06522605B1
    • 2003-02-18
    • US09650640
    • 2000-08-30
    • Koichi TadaTakashi Onaka
    • Koichi TadaTakashi Onaka
    • G11B700
    • G11B7/0945G11B7/0053G11B7/094
    • A disk apparatus includes a DSP core. When turning on power to the apparatus main body or exchanging the MO disk, setting processing of focus offset (offset) values is performed. The DSP core extracts fine clock mark (FCM) signals out of the reproduced signal through tracking on the land/groove. Specifically, in a range that mean value of FCM signal levels is equal to or greater than a predetermined level, FCM signal levels are detected at positions shifted left and right by a predetermined amount from a present offset value. In this manner, scanning is made throughout the range while being shifted by a predetermined amount, each time of which a difference is detected. An offset value where the difference assumes a minimum is determined as an optimal offset value. The optimal offset values are determined respectively for the land and the groove, which are switched according to a track (land/groove) upon reproduction.
    • 盘装置包括DSP核。 当打开设备主体的电源或更换MO盘时,执行聚焦偏移(偏移)值的设置处理。 DSP内核通过在接地/沟槽上进行跟踪,提取出再生信号中的精细时钟标记(FCM)信号。 具体地说,在FCM信号电平的平均值等于或大于预定电平的范围内,从当前偏移值向左右移动预定量的位置检测FCM信号电平。 以这种方式,在整个范围内进行扫描,同时移动预定量,每次检测到差异。 将差异假定为最小的偏移值确定为最佳偏移值。 分别对于在再现时根据轨道(平台/凹槽)切换的脊和槽分别确定最佳偏移值。