公开(公告)号：US20050105433A1

公开(公告)日：2005-05-19

申请号：US10605999

申请日：2003-11-13

申请人： Kuan-Kai Juan ,  Kun-Hung Hsieh

发明人： Kuan-Kai Juan ,  Kun-Hung Hsieh

IPC分类号： G11B7/00 ,  G11B19/12

CPC分类号： G11B19/12 ,  G11B2007/0006

摘要： An optical disc apparatus includes a memory, a control circuit, a motor, a spindle, and a pickup head. When determining the type of optical disc, the optical disc apparatus moves a focusing lens at a constant velocity. A first duration is measured that indicates how much time it takes for the moving focal point of a laser shining through the focusing lens to pass through a first layer of the optical disc. A second duration is also measured that indicates how much time it takes for the moving focal point to move from the first layer to a second layer of the optical disc. A ratio of the second duration to the first duration indicates optical disc type.

摘要翻译： 光盘装置包括存储器，控制电路，马达，主轴和拾取头。 当确定光盘的类型时，光盘装置以恒定速度移动聚焦透镜。 测量第一持续时间，其指示通过聚焦透镜照射的激光的移动焦点通过光盘的第一层需要多少时间。 还测量第二持续时间，其指示移动焦点从光盘的第一层移动到第二层所需的时间。 第二持续时间与第一持续时间的比率表示光盘类型。