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1. 发明授权

US06744721B2 Optical disk drive 失效
标题翻译：光盘驱动器
公开(公告)号：US06744721B2
公开(公告)日：2004-06-01
申请号：US10142511
申请日：2002-05-09
申请人： Yuichi Kamioka , Chikashi Inokuchi , Takayuki Sakabayashi
发明人： Yuichi Kamioka , Chikashi Inokuchi , Takayuki Sakabayashi
IPC分类号： G11B700
CPC分类号： G11B27/24 , G11B7/0053 , G11B7/007 , G11B20/1403 , G11B2220/216 , G11B2220/218 , G11B2220/2545 , G11B2220/2562 , G11B2220/2575
摘要： An optical disk drive reads and/or writes data from/on an optical disk on which a pre-pit has been formed on at least one side edge of a data recording track. The disk drive includes light-emitting element, photodetector section, subtractor and amplifier. The light-emitting element emits a light beam and irradiates the track with the light beam. The photodetector section receives and detects the light beam reflected from the track, thereby generating first and second detection signals, carrying information about shapes of the track at the one and the other side edges thereof, respectively, based on the reflected light beam. The subtractor generates a differential signal representing a difference between the first and second detection signals. The amplifier amplifies the differential signal, output from the subtractor, by a variable amplification factor. The optical disk drive detects the pre-pit in accordance with the amplified differential signal.
摘要翻译：光盘驱动器在数据记录磁道的至少一个侧边缘上从其上形成有预制凹坑的光盘上读取数据和/或写入数据。磁盘驱动器包括发光元件，光电检测器部分，减法器和放大器。发光元件发射光束并用光束照射轨道。光电检测器部分接收并检测从轨道反射的光束，从而基于反射光束分别产生第一和第二检测信号，分别携带关于轨道的一侧和另一侧边缘的形状的信息。减法器产生表示第一和第二检测信号之间的差的差分信号。放大器放大差分信号，从减法器输出一个可变放大因子。光盘驱动器根据放大的差分信号检测预制凹坑。

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