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1.发明授权GERÄT ZUM BESCHREIBEN UND/ODER LESEN OPTISCHER AUFZEICHNUNGSTRÄGER UNTERSCHIEDLICHEN AUFBAUS 失效设备写入和/或读取的光学记录介质各项建设
公开(公告)号：EP0900435B1
公开(公告)日：2001-11-14
申请号：EP97907045.5
申请日：1997-02-27
CPC分类号： G11B19/12 , G11B7/08511 , G11B7/0945 , G11B7/1374 , G11B7/13922 , G11B19/00 , G11B2007/0006 , G11B2007/0013 , G11B2019/121
摘要： In order to identify the type of recording medium, a switch can be provided or alternatively a physical characteristic such as layer thickness can be defined. The changes of the focusing signal with time or the plausibility of the reproduction signal can be monitored. The reading beam is focused.
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2.发明公开GERÄT ZUM BESCHREIBEN UND/ODER LESEN OPTISCHER AUFZEICHNUNGSTRÄGER UNTERSCHIEDLICHEN AUFBAUS 失效设备写入和/或读取的光学记录介质各项建设
公开(公告)号：EP0900435A2
公开(公告)日：1999-03-10
申请号：EP97907045.0
申请日：1997-02-27
CPC分类号： G11B19/12 , G11B7/08511 , G11B7/0945 , G11B7/1374 , G11B7/13922 , G11B19/00 , G11B2007/0006 , G11B2007/0013 , G11B2019/121
摘要： In order to identify the type of recording medium, a switch can be provided or alternatively a physical characteristic such as layer thickness can be defined. The changes of the focusing signal with time or the plausibility of the reproduction signal can be monitored. The reading beam is focused.
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