公开(公告)号：US5202868A

公开(公告)日：1993-04-13

申请号：US530017

申请日：1990-05-23

申请人： Masatoshi Terao ,  Takeshi Ikegami ,  Kazumi Saburi ,  Hiroe Miyajima ,  Takashi Kato ,  Takashi Horinouchi ,  Katsura Komiyama

发明人： Masatoshi Terao ,  Takeshi Ikegami ,  Kazumi Saburi ,  Hiroe Miyajima ,  Takashi Kato ,  Takashi Horinouchi ,  Katsura Komiyama

IPC分类号： G11B7/085 ,  G11B7/09 ,  G11B7/135

CPC分类号： G11B7/1359 ,  G11B7/08547 ,  G11B7/0901

摘要： A beam spot controlling method for controlling the beam-converging position by a light beam from an objective lens on a recording track of a recording medium comprising the steps of (a) rotating a tapered prism having an inclination-imparting portion capable of imparting an inclination to a light beam which enters the tapered prism for changing the inclination of the light beam incident on said objective lens for controlling the beam-converging position by the light beam; (b) causing a light beam to enter the tapered prisms; and (c) causing the light beam exiting from the tapered prism to enter the objective lens, and directing the exiting light beam onto the recording track of said recording medium, and an apparatus for performing the above beam spot controlling method.

摘要翻译： 一种用于通过来自物镜的光束在记录介质的记录轨道上控制束聚焦位置的束斑控制方法，包括以下步骤：（a）旋转具有倾斜赋予部分的锥形棱镜，所述倾斜棱镜具有能够赋予倾斜度 到入射到锥形棱镜中的光束，用于改变入射在所述物镜上的光束的倾斜度，用于通过光束控制光束会聚位置; （b）使光束进入锥形棱镜; 和（c）使从锥形棱镜出射的光束进入物镜，并将出射光束引导到所述记录介质的记录轨道上，以及执行上述光点控制方法的装置。