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1. 发明申请

US20080062852A1 Multi-Dimensional Optical Scanner 审中-公开
标题翻译：多维光学扫描仪
公开(公告)号：US20080062852A1
公开(公告)日：2008-03-13
申请号：US11576904
申请日：2005-10-13
申请人： Alexander Van Der Lee , Coen Theodoru Liedenbaum , Teunis Tukker
发明人： Alexander Van Der Lee , Coen Theodoru Liedenbaum , Teunis Tukker
IPC分类号： G11B7/00
CPC分类号： G11B7/1378 , G11B7/0909 , G11B7/14
摘要： The present invention relates to an optical scanning device for reading and/or writing on a plurality of tracks on an optical storage medium (1), said scanning device comprising optical means (17) for focusing a plurality of beams, after being reflected from said medium, onto an observation plane (22), and for introducing astigmatism into at least one of said reflected beams, and a photo-detector (18) comprising a plurality of detector segments, arranged in said observation plane (22) to receive said at least one astigmatic reflected beam. The scanning device further comprises means (19) for generating a focus error signal (FES) by combining signals produced by said detector segments, means (19) for generating a central aperture signal by adding signals from all the detector segments, and means (19, 21) for determining when said central aperture signal exceeds a predefined threshold, indicating a useful range of said focus error signal, and, when this is the case, adjusting the focus of said objective lens (15) based on said focus error signal. According to this design, the CA-signal ensures that tracking is only based on the focus error signal in a range in which tracking can be based on it, thereby ensuring satisfactory closed loop tracking.
摘要翻译：本发明涉及一种用于在光学存储介质（1）上的多个磁道上读取和/或写入光学扫描装置，所述扫描装置包括用于聚焦多个光束的光学装置（17），在从所述光学存储介质介质，到观察平面（22）上，并且用于将散光引入到所述反射光束中的至少一个中;以及光检测器（18），包括多个检测器段，布置在所述观察平面（22）中以接收所述在至少一个散光反射光束。扫描装置还包括用于通过组合由所述检测器段产生的信号来产生聚焦误差信号（FES）的装置（19），用于通过加上来自所有检测器段的信号产生中心孔径信号的装置（19）和装置，21），用于确定所述中心孔径信号何时超过预定阈值，指示所述聚焦误差信号的有用范围，并且在这种情况下，基于所述聚焦误差信号调整所述物镜（15）的焦点。根据这种设计，CA信号确保跟踪仅基于跟踪可以基于其的范围内的聚焦误差信号，从而确保令人满意的闭环跟踪。

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