发明名称 OPTICAL HEAD
摘要 <P>PROBLEM TO BE SOLVED: To provide an optical head in which signal acquisition quality can be improved by reducing occurrence of interference between codes of the optical disk, while output of a data signal and a control signal can be acquired sufficiently without increasing output of a laser light source, and which has high reliability. <P>SOLUTION: The optical head A has a semiconductor laser light source 1, a collimator lens 2, a beam splitter 3, an objective lens 5, a detecting lens 6, and a photodetecting element 7, and is provided with a diffraction grating 4 in which a second grating part having a high ratio of a 1st order diffraction light is held between two first grating parts having a high ratio of 0th order diffraction light in the diffraction light on the same plane. <P>COPYRIGHT: (C)2007,JPO&INPIT
申请公布号 JP2007200477(A) 申请公布日期 2007.08.09
申请号 JP20060018928 申请日期 2006.01.27
申请人 FUNAI ELECTRIC CO LTD 发明人 NAGASHIMA KENJI
分类号 G11B7/135 主分类号 G11B7/135
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