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    • 1. 再颁专利
    • Method and apparatus for optical recording and reproducing with tracking servo reducing track offset
    • 具有跟踪伺服减少磁道偏移的光学记录和再现的方法和装置
    • USRE39013E1
    • 2006-03-14
    • US10633655
    • 2003-08-05
    • Toshimitsu KakuKazuo ShigematsuHisataka SugiyamaTakeshi MaedaMasahiro Takasago
    • Toshimitsu KakuKazuo ShigematsuHisataka SugiyamaTakeshi MaedaMasahiro Takasago
    • G11B7/095
    • G11B7/094
    • Disclosed is an optical recording and reproducing apparatus comprising a light source directing a light spot toward a recording medium, a detection system detecting light reflected from the recording medium to derive an electrical signal from the reflected light, an information processing circuit modulating the intensity of the light spot according to writing pulses to record information on the recording medium and using the electrical signal to reproduce information from the recording medium, and a tracking servo circuit carrying out tracking servo operation on the basis of the electrical signal and including an extracting circuit connected to a source of extracting pulses having a pulse width at least equal to the writing pulse width so that writing pulse parts contained in the electrical signal are extracted during recording information, whereby a track offset occurring during information recording can be minimized, and the stability of the tracking servo system can be improved.
    • 公开了一种光学记录和再现装置,包括将光点引向记录介质的光源;检测系统,其检测从记录介质反射的光以从反射光导出电信号;信息处理电路, 根据写入脉冲的光点,以记录在记录介质上的信息并使用电信号从记录介质再现信息;以及跟踪伺服电路,其基于电信号执行跟踪伺服操作,并且包括提取电路, 提取具有至少等于写入脉冲宽度的脉冲宽度的脉冲的源,从而在记录信息期间提取包含在电信号中的写入脉冲部分,由此可以最小化信息记录期间发生的磁道偏移,并且稳定性 跟踪伺服系统可以提高。