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	Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatus
	KATAYAMA, RYUICHI
	2009-06-02
著作权人	NEC CORPORATION
专利号	US7542401
国家	美国
文献子类	授权发明
其他题名	Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatus
英文摘要	Four types of optical systems, a polarization optical system including an objective lens having a high numerical aperture, a polarization optical system including an objective lens having a low numerical aperture, a non-polarization optical system including an objective lens having a high numerical aperture and a non-polarization optical system including an objective lens having a low numerical aperture, are selectively used at the time of irradiating light from a semiconductor laser on a target disk for measurement, and the in-plane birefringence characteristic and perpendicular birefringence characteristic of the target disk are separately acquired based on the amounts of received light obtained by measuring reflected light from the target disk by a photosensor.
公开日期	2009-06-02
申请日期	2007-05-17
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/32653]
专题	半导体激光器专利数据库
作者单位	NEC CORPORATION
推荐引用方式 GB/T 7714	KATAYAMA, RYUICHI. Birefringence characteristic measuring method, optical recording medium and optical information recording/reproducing apparatus. US7542401. 2009-06-02.

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