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    • 10. 发明授权
    • Optical pickup unit and information recording apparatus using the same
    • 光拾取单元及使用其的信息记录装置
    • US07751286B2
    • 2010-07-06
    • US11453066
    • 2006-06-15
    • Tetsuya OgataTatsuo Mikami
    • Tetsuya OgataTatsuo Mikami
    • G11B7/09
    • G11B7/1353G11B7/007G11B7/0903G11B7/0943G11B2007/0013
    • An optical pickup unit for recording information on and/or reproducing information from a multilayer information recording medium including multiple recording surfaces in each of which a guide groove on which the information is to be recorded is spirally formed is disclosed. The optical pickup unit includes a light source, a diffraction element configured to split the light beam emitted from the light source into a main light beam and first and second sub light beams, an objective lens for focusing the main and sub light beams onto a recording surface of the multilayer information recording medium, and multiple light receiving elements each divided into light receiving parts so as to receive the main and sub light beams reflected from the recording surface. The focused first and second sub light beams are disposed at respective positions at least 3/2 tracks away from the focused main light beam on the recording surface.
    • 公开了一种用于从包括多个记录表面的多层信息记录介质中记录信息和/或再现信息的光学拾取单元,其中每个记录有要记录信息的引导槽被螺旋地形成。 光拾取单元包括光源,被配置为将从光源发射的光束分成主光束和第一和第二子光束的衍射元件,用于将主光束和次光束聚焦到记录 多层信息记录介质的表面,以及分别被光接收部分接收从记录表面反射的主光束和副光束的多个光接收元件。 聚焦的第一和第二子光束被设置在离记录表面上的聚焦主光束至少3/2个磁道的相应位置处。