公开(公告)号：US06813229B1

公开(公告)日：2004-11-02

申请号：US09509551

申请日：2000-04-12

申请人： Souzyu Gotou ,  Kiichiro Koide ,  Seiichi Itou ,  Youichi Harasawa ,  Toshiaki Kitano ,  Tetsuya Baba ,  Toshihiro Sasaki

发明人： Souzyu Gotou ,  Kiichiro Koide ,  Seiichi Itou ,  Youichi Harasawa ,  Toshiaki Kitano ,  Tetsuya Baba ,  Toshihiro Sasaki

IPC分类号： G11B700

CPC分类号： G11B7/1353 ,  G11B7/0908 ,  G11B7/094 ,  G11B7/0945 ,  G11B7/14

摘要： An optical system including an objective lens applies five light beams (31 to 35) generated by an optical pickup to a plurality of adjacent tracks on a signal plane of a CD-ROM. Light beams reflected from the signal plane are detected with photodetectors (PD1, to PD6), and in accordance with the detection outputs of the photodetectors (PD1 to PD5), a record data read system reads at the same time data recorded on respective tracks applied with the light beams (31 to 35), and outputs to read data in the record order of CD-ROM by preventing the read data from being duplicated or omitted. Prior to reading record data, a system controller performs an offset bias adjustment of a focus servo system.

摘要翻译： 包括物镜的光学系统将由光学拾取器生成的五个光束（31至35）应用于CD-ROM的信号平面上的多个相邻轨道。 用光电检测器（PD1，PD6）检测从信号平面反射的光束，并且根据光电检测器（PD1至PD5）的检测输出，记录数据读取系统同时读取记录在相应磁道上的数据 （31〜35），并通过防止读取数据被复制或省略而输出以CD-ROM的记录顺序读取数据。 在读取记录数据之前，系统控制器执行聚焦伺服系统的偏移偏移调整。