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1.发明公开Pre-pit detecting apparatus for optical recording medium 审中-公开Prepitdetektorfüroptisches Speichermedium
公开(公告)号：EP1229533A3
公开(公告)日：2003-09-17
申请号：EP02002572.2
申请日：2002-02-04
申请人： Pioneer Corporation
CPC分类号： G11B19/12 , G11B7/005 , G11B7/00745
摘要： A pre-pit detecting apparatus which, when a light beam is radiated onto an optical recording medium having a recording surface with pre-pits repeatedly formed between tracks, receives light reflected by the recording surface with first and second light receiving faces, obtains the push-pull signal corresponding to the light receiving signals for the first and second light receiving faces, and binarizes the push-pull signal by using a threshold value to generate a pre-pit detection signal. It is judged which area of a plurality of areas including at least a not-yet-recorded area corresponds to a position of the recording surface where the light beam is radiated is performed to judge. Then the threshold value is set in accordance with the judgement result.
摘要翻译： 一种预凹坑检测装置，当将光束照射到具有在轨迹之间重复形成的预凹坑的记录表面的光记录介质上时，接收由第一和第二光接收面反射的记录表面的光，获得推 - 对应于第一和第二光接收面的光接收信号的 - 空信号，并且通过使用阈值来二值化推挽信号以产生预凹坑检测信号。 判断包括至少未记录区域的多个区域的哪个区域对应于执行光束的记录表面的位置进行判断。 然后根据判断结果设定阈值。
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2.发明公开Apparatus for inspecting pre-pits of an optical recording medium 审中-公开PrüfgerätfürPre-pits eines optischen Aufzeichnungsmediums
公开(公告)号：EP1235214A2
公开(公告)日：2002-08-28
申请号：EP02003817.0
申请日：2002-02-20
申请人： Pioneer Corporation
IPC分类号： G11B7/26
CPC分类号： G11B7/268 , G11B7/00375 , G11B7/0053
摘要： Optical discs with land pre-pits must be inspected after manufacture to determine whether the land pre-pits conform to a prescribed standard. Apparatus for measuring the aperture ratio (i.e. the ratio of the maximum and the minimum peaks of the overlapped waveforms of the radial push-pull signal from the land pre-pits) is disclosed in with the influence of foreign substances on the disc surface is reduced. The apparatus comprises first and second light receiving means, substracting means for generating the push-pull signal, means for collecting sample data by sampling the puh-pull signal for a predetermined period of time and for repeating the predetermined period of sampling a plurality of times, frequency determination means for determining whether each data value corresponding to a pre-pit position of the sample data is obtained by a predetermined number of times or greater and means for calculating the aperture value when data values have been determined a predetermined number of times or greater.
摘要翻译： 具有土地预制坑的光盘必须在制造后进行检查，以确定土地预制坑是否符合规定的标准。 公开了用于测量开口率的装置（即，来自陆地预制凹坑的径向推挽信号的重叠波形的最大和最小峰值的比率），因为异物对盘表面的影响减小 。 该装置包括第一和第二光接收装置，用于产生推挽信号的减法装置，用于通过在预定时间段内对抽头信号进行采样来收集采样数据的装置，以及重复多次的预定采样周期 ，频率确定装置，用于确定与样本数据的预凹坑位置相对应的每个数据值是否获得预定次数或更大;以及用于当数据值已经被确定预定次数时计算光圈值的装置，或者 更大。
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公开(公告)号：EP1235214A3
公开(公告)日：2007-04-11
申请号：EP02003817.0
申请日：2002-02-20
申请人： Pioneer Corporation
IPC分类号： G11B7/005 , G11B7/26 , G11B7/0037
CPC分类号： G11B7/268 , G11B7/00375 , G11B7/0053
摘要： Optical discs with land pre-pits must be inspected after manufacture to determine whether the land pre-pits conform to a prescribed standard. Apparatus for measuring the aperture ratio (i.e. the ratio of the maximum and the minimum peaks of the overlapped waveforms of the radial push-pull signal from the land pre-pits) is disclosed in with the influence of foreign substances on the disc surface is reduced. The apparatus comprises first and second light receiving means, substracting means for generating the push-pull signal, means for collecting sample data by sampling the puh-pull signal for a predetermined period of time and for repeating the predetermined period of sampling a plurality of times, frequency determination means for determining whether each data value corresponding to a pre-pit position of the sample data is obtained by a predetermined number of times or greater and means for calculating the aperture value when data values have been determined a predetermined number of times or greater.
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公开(公告)号：EP1229533A2
公开(公告)日：2002-08-07
申请号：EP02002572.2
申请日：2002-02-04
申请人： Pioneer Corporation
CPC分类号： G11B19/12 , G11B7/005 , G11B7/00745
摘要： A pre-pit detecting apparatus which, when a light beam is radiated onto an optical recording medium having a recording surface with pre-pits repeatedly formed between tracks, receives light reflected by the recording surface with first and second light receiving faces, obtains the push-pull signal corresponding to the light receiving signals for the first and second light receiving faces, and binarizes the push-pull signal by using a threshold value to generate a pre-pit detection signal. It is judged which area of a plurality of areas including at least a not-yet-recorded area corresponds to a position of the recording surface where the light beam is radiated is performed to judge. Then the threshold value is set in accordance with the judgement result.
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