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1. 发明申请

US20080310283A1 Method of Reading Out Information from a Multiple Layer Optical Recording Medium and Optical Readout Device 审中-公开
标题翻译：从多层光记录介质和光读出装置读出信息的方法
公开(公告)号：US20080310283A1
公开(公告)日：2008-12-18
申请号：US11995236
申请日：2006-07-10
申请人： Johanes De Wit , Joris Vrehen , Sjoerd Stallinga
发明人： Johanes De Wit , Joris Vrehen , Sjoerd Stallinga
IPC分类号： G11B7/00
CPC分类号： G11B7/131 , G11B7/0903 , G11B7/1353 , G11B2007/0013
摘要： The present invention relates to a method of reading out information from a multiple layer optical recording medium (10) by an optical readout device (12), the method comprising the steps of: focusing a central light beam (14) and two satellite light beams (16, 18) onto a first recording layer (20) of the optical recording medium, projecting reflection beams (22, 24) of at least part of the satellite light beams on two split detectors (26, 28), thereby creating satellite spots (116, 118), each split detector being associated with one of the satellite light beams, the reflected light interfering with light reflected by a second recording layer (21), and processing the signals from the split detectors for providing a tracking error signal, wherein the influence of a central part (29) of the reflection beams on the tracking error signal is removed and/or modified, thereby reducing a negative influence of this central part on the quality of the tracking error signal. The present invention further relates to an optical readout device (12) and to a grating (3Oe) for use in an optical readout device (12).
摘要翻译：本发明涉及一种通过光学读出装置（12）从多层光学记录介质（10）读出信息的方法，该方法包括以下步骤：将中心光束（14）和两个卫星光束（16,18）放置在光学记录介质的第一记录层（20）上，将至少一部分卫星光束的反射光束（22,24）投影到两个分离检测器（26,28）上，由此产生卫星点（116,118），每个分离检测器与卫星光束之一相关联，所述反射光干涉由第二记录层（21）反射的光，并且处理来自分割检测器的信号以提供跟踪误差信号，其中反射光束的中心部分（29）对跟踪误差信号的影响被去除和/或修改，从而减少该中心部分对跟踪误差信号质量的负面影响。本发明还涉及一种用于光学读出装置（12）的光学读出装置（12）和光栅（30e）。

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