专利名称：Optical pickup unit and information
recording and reproducing apparatus
发明人：Hideaki Hirai申请号：US11702159申请日：20070205
公开号：US20070133372A1公开日：20070614
专利附图：
摘要：An optical pickup unit includes a light source emitting a light beam, an objectivelens focusing the light beam onto an information recording medium, a light detectionpart receiving the light beam reflected from the information recording medium, and a
light blocking part selectively blocking a part of the light beam with respect to a radialdirection. The light blocking part is provided in an optical path of the light beam centeredon an optical axis.
申请人：Hideaki Hirai
地址：Kanagawa JP
国籍：JP
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