公开(公告)号：US20070008840A1

公开(公告)日：2007-01-11

申请号：US10574443

申请日：2004-10-06

申请人： Hubert Martens ,  Aloysius Spruijt ,  Marc Consemulder ,  Pierre Woerlee ,  Wilhelmus Koppers

发明人： Hubert Martens ,  Aloysius Spruijt ,  Marc Consemulder ,  Pierre Woerlee ,  Wilhelmus Koppers

IPC分类号： G11B7/00 ,  G11B7/24

CPC分类号： G11B7/24082 ,  G11B7/094 ,  G11B7/24038

摘要： A record carrier is for recording information by writing marks in a track on a recording layer. The shortest mark used for recording the information has a length of a predefined minimum number d of channel bit lengths. The record carrier (11) has a pregroove that is modulated by a carrier pattern containing focus marks (18,19) that provides a focus area (12) at a predefined location on the recording layer. The focus marks have lengths of at least two times the length of the shortest mark for being substantially longer than the effective diameter of the scanning spot. A scanning device locates the focus area and determines the best focus offset by detecting the maximum read signal amplitude while scanning the carrier pattern.

摘要翻译： 记录载体用于通过在记录层上的轨道中书写标记来记录信息。 用于记录信息的最短标记具有通道位长度的预定最小数目d的长度。 记录载体（11）具有由包含在记录层上的预定位置提供聚焦区域（12）的聚焦标记（18,19）的载体图案调制的预制槽。 焦点标记具有比最短标记的长度的至少两倍的长度，其长度远大于扫描光斑的有效直径。 扫描装置定位聚焦区域，并通过在扫描载体图案时检测最大读取信号幅度来确定最佳聚焦偏移。