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	Optical pickup apparatus
	NAKANO, JUNICHI; IWASAKI, NOBUYOSHI; MATSUO, DAISUKE; KOBAYASHI, SHOHEI
	2003-12-09
著作权人	OLYMPUS OPTICAL CO., LTD.
专利号	US6661765
国家	美国
文献子类	授权发明
其他题名	Optical pickup apparatus
英文摘要	A laser beam emitted from a laser source provided at a silicon substrate passes through a hologram element formed of a translucent flat plate and a grating, thereby being subjected to NA conversion executed by an NA converting lens, passing through a polarizing film of a polarization beam splitter, and converging onto a magneto-optical disk via a collimator lens and an objective. A part of back-reflection from the magneto-optical disk, which is reflected by a polarizing film of the polarization beam splitter, is reflected by a reflection surface of the splitter, then branched into two polarized light beams by a Wollaston prism, and guided to one light receiving element group. On the other hand, another part of the back-reflection, which passes through the polarization beam splitter, is branched into two beams by the hologram element and guided to the other light receiving element groups.
公开日期	2003-12-09
申请日期	2000-12-27
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/69600]
专题	半导体激光器专利数据库
作者单位	OLYMPUS OPTICAL CO., LTD.
推荐引用方式 GB/T 7714	NAKANO, JUNICHI,IWASAKI, NOBUYOSHI,MATSUO, DAISUKE,et al. Optical pickup apparatus. US6661765. 2003-12-09.

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