公开(公告)号：US07933189B2

公开(公告)日：2011-04-26

申请号：US12423911

申请日：2009-04-15

申请人： Takeshi Omori ,  Takaaki Kassai ,  Kenji Maebara ,  Keiji Fujita ,  Hiroaki Ashiwa

发明人： Takeshi Omori ,  Takaaki Kassai ,  Kenji Maebara ,  Keiji Fujita ,  Hiroaki Ashiwa

IPC分类号： G11B7/00

CPC分类号： G11B7/0909 ,  G11B7/261

摘要： In a focus optical system for optical discs or optical disc master exposure apparatuses, a relative positional relation between a cylindrical lens and a 4-division detector in an astigmatic optical system is adjust so that an interference fringe appearing in reflected light derived from an optical disc master is made to be incident on a dead zone of the 4-division detector. Thus, an astigmatic focus servo free from effects of variations in a focus error signal due to the interference fringe is realized. As a result of this, effects of the interference fringe appearing in the reflected light derived from an optical disc or optical disc master can be suppressed.

摘要翻译： 在用于光盘或光盘主曝光装置的聚焦光学系统中，调整像散光学系统中的柱面透镜和4分辨率检测器之间的相对位置关系，使得出现在来自光盘的反射光中的干涉条纹 主人被发现在四分之一检测器的死区。 因此，实现了不受干涉条纹引起的聚焦误差信号变化影响的像散聚焦伺服。 结果，可以抑制出现在从光盘或光盘母盘导出的反射光中的干涉条纹的影响。