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21. 发明授权

US4896309A Optical disc player with phase shift dependent on disk rotation direction 失效
标题翻译：具有相移的光盘播放机取决于磁盘旋转方向
公开(公告)号：US4896309A
公开(公告)日：1990-01-23
申请号：US201197
申请日：1988-06-02
申请人： Akio Yamakawa , Noriyuki Yamashita , Masaaki Arai
发明人： Akio Yamakawa , Noriyuki Yamashita , Masaaki Arai
IPC分类号： H04N5/85 , G11B7/00 , G11B7/005 , G11B7/13 , G11B7/135
CPC分类号： G11B7/13
摘要： A signal reproducing system for use in an optical disc player comprises a photodetector including at least first and second photodetecting elements which are so disposed that a beam spot is formed on the first and second photodetecting elements by a light beam caused to impinge upon and reflected at an optical record disc and are aligned along a direction of movement of a diffraction pattern appearing in the beam spot in accordance with a record track on the optical record disc, a phase shifter for varying at least a phase of one of first and second output signals obtained respectively based on detection outputs of the first and second photodetecting elements, a switch for causing the first and second output signals selectively to pass through the phase shifter in response to a direction of movement of the record track in relation to the light beam incident upon the optical record disc, and a mixer operative to add one of the first and second output signals derived from the phase shifter to the other of the first and second output signals so as to produce a reproduced information signal.
摘要翻译：用于光盘播放器的信号再现系统包括一个光电检测器，该光电检测器至少包括第一和第二光电检测元件，该第一和第二光电检测元件被设置成通过一束光线形成在第一和第二光电检测元件上的光斑，光学记录盘，并且根据光记录盘上的记录轨道沿出现在光斑中的衍射图案的移动方向排列;移相器，用于改变第一和第二输出信号之一的至少相位分别基于第一和第二光电检测元件的检测输出而获得的开关，用于响应于记录轨道相对于入射到的光束的移动方向而选择性地使第一和第二输出信号通过移相器的开关光学记录盘和混合器，其可操作以添加从相移导出的第一和第二输出信号中的一个呃到第一和第二输出信号中的另一个，以便产生再现的信息信号。

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