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1. 发明授权

US06430119B1 Optical disk drive apparatus capable of searching an optimum target position 失效
标题翻译：能够搜索最佳目标位置的光盘驱动装置
公开(公告)号：US06430119B1
公开(公告)日：2002-08-06
申请号：US09568186
申请日：2000-05-09
申请人： Yuu Okada , Katsuya Watanabe , Tetsuya Shihara , Akihiko Nishioka , Koujiro Okamoto
发明人： Yuu Okada , Katsuya Watanabe , Tetsuya Shihara , Akihiko Nishioka , Koujiro Okamoto
IPC分类号： G11B2108
CPC分类号： G11B21/083 , G11B7/00718 , G11B7/0908 , G11B7/094 , G11B7/0945
摘要： An optical disk apparatus includes a converging section for converging a light beam toward an information carrier; a moving section for moving the light beam converged by the converging section in a direction perpendicular to a surface of the information carrier; a light detector for detecting the light beam reflected by the information carrier; a convergence state detecting section for generating a convergence state signal representing a convergence state of the light beam at a convergence point on the information carrier and outputting a reproduction signal from the information carrier, based on the output from the light detector; a focus controller for driving the moving section to make the convergence state constant based on the convergence state signal and a prescribed target position; a reproduction quality signal detector for detecting a reproduction quality signal representing a quality of the reproduction signal based on the reproduction signal; a reproduction quality signal measuring section for changing the target position and measuring a value of the reproduction quality signal corresponding to each of the changed target positions; a reproduction quality signal characteristic determining section for determining a characteristic of the reproduction quality signal based on the value of the reproduction quality signal corresponding to each of the changed target positions; and a target position searching section for searching for an optimum target position of the focus controller for optimizing the value of the reproduction quality signal based on a determination result of the reproduction quality signal characteristic determining section.
摘要翻译：光盘装置包括会聚光束朝向信息载体的会聚部分; 移动部分，用于沿着垂直于信息载体表面的方向移动由会聚部分会聚的光束; 用于检测由信息载体反射的光束的光检测器; 会聚状态检测部分，用于产生表示信息载体上的会聚点处的光束的会聚状态的会聚状态信号，并根据光检测器的输出从信息载体输出再现信号; 聚焦控制器，用于驱动所述移动部分，以使所述会聚状态基于所述会聚状态信号和规定的目标位置而恒定; 再现质量信号检测器，用于基于再现信号检测表示再现信号的质量的再现质量信号; 再现质量信号测量部分，用于改变目标位置并测量与每个改变的目标位置对应的再现质量信号的值; 再现质量信号特征确定部分，用于基于与每个改变的目标位置对应的再现质量信号的值来确定再现质量信号的特性; 以及目标位置搜索部分，用于基于再现质量信号特性确定部分的确定结果，搜索用于优化再现质量信号的值的焦点控制器的最佳目标位置。

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