公开(公告)号：US4980882A

公开(公告)日：1990-12-25

申请号：US277537

申请日：1988-11-28

申请人： James W. Baer ,  Majed K. Abed

发明人： James W. Baer ,  Majed K. Abed

IPC分类号： G11B7/007 ,  G11B7/09

CPC分类号： G11B7/09 ,  G11B7/24082

摘要： An improved coarse access and tracking servo system for use with an optical disk storage system is disclosed. Concentric servo tracks placed on the disk are readily distinguished from data tracks placed on the disk which may or may not be present on the disk depending upon the amount of information that has been written on the disk, i.e., how "full" the disk is with respect to its maximum capacity for storing data. A predetermined signal is embedded within each of the plurality of concentric servo tracks found on the disk. A radial strip or line, sufficiently long to always include at least one servo track, but also long enough to include data tracks, if any, on either side of the illuminated servo track is projected on the surface of the disk in order to detect the servo tracks. Light returned from the illuminated servo tracks falls upon a detector and generates a frequency component that is readily distinguished from any frequency components associated with signals generated from light returned from any of the data tracks. The position of the servo track within the illuminated radial strip or line is then accurately determined, regardless of whether data tracks are present or not within the illuminated strip or line. This position of the servo track within the illuminated radial strip or line is then used by the coarse access and tracking servo system in order to accurately position an optical head at a desired position with respect to a selected coarse servo track on the disk.

摘要翻译： 公开了一种用于光盘存储系统的改进的粗略访问和跟踪伺服系统。 放置在磁盘上的同心伺服磁道可以容易地与放置在磁盘上的数据磁道区分开，磁盘上可能存在或可能不存在于磁盘上的信息，这取决于已写入磁盘的信息量，即磁盘“完整” 相对于其存储数据的最大容量。 预定信号被嵌入在盘上发现的多个同心伺服磁道的每一个中。 足够长的总是包括至少一个伺服轨道，但也足够长以包括在照明的伺服轨道的任一侧上的数据轨迹（如果有的话）被投影在盘的表面上的径向条或线，以便检测 伺服轨道。 从照明的伺服磁道返回的光落在检测器上，并产生一个频率分量，该频率分量容易与与从任何数据轨道返回的光产生的信号相关联的任何频率分量区分开。 然后可以精确地确定在照明的径向条或线内的伺服轨道的位置，而不管数据轨道是否存在于被照明的条带或线内。 照亮的径向条带或线内的伺服轨道的该位置然后由粗略的访问和跟踪伺服系统使用，以便将光头相对于盘上选定的粗略伺服轨道精确地定位在期望的位置。