Optical pickup and method of adjusting same

专利名称：Optical pickup and method of adjusting

same

发明人：Shimizu, Manabu,Ishida, Yuhdzi,Shodo, Kenzo申请号：EP99101265.9申请日：19990122公开号：EP0932146A2公开日：19990728

专利附图：

摘要：An optical pickup includes a diffraction element (30) for causing diffraction in areflection beam from a disc. This diffraction element is divided into two of first (30a) andsecond regions (30b). On four light receiving elements are converged respectively a first

reflection beam from a first region and a second reflection light from a second region. Aswitch performs switching-over between four output signals individually taken from fourlight receiving elements and three output signals in total taken out by adding togethertwo output signals of four output signals.

申请人：ROHM CO., LTD.

地址：21, Saiin Mizosaki-cho Ukyo-ku Kyoto JP

国籍：JP

代理机构：Herrmann-Trentepohl, Werner, Dipl.-Ing.

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