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	Optical head device, optical information recorder/reproducer employing the optical head device and optical information recording/reproducing method
	KATAYAMA, RYUICHI
	2008-09-18
著作权人	NEC CORPORATION
专利号	WO2008111352A1
国家	世界知识产权组织
文献子类	发明申请
其他题名	Optical head device, optical information recorder/reproducer employing the optical head device and optical information recording/reproducing method
英文摘要	Between a semiconductor laser and a polarizing beam splitter, a polarization direction control element, including a liquid crystal polymer layer divided into a plurality of concentric circle regions having different optical axis directions, is provided. A voltage is applied to the liquid crystal polymer layer at the time of recording. Since the polarization direction control element acts as a full wavelength plate for incident light, the light exiting the polarizing beam splitter has an intensity distribution identical to that of the incident light and the rim strength in an objective lens lowers. No voltage is applied to the liquid crystal polymer layer at the time of reproduction. Since the polarization direction control element operates as a half wavelength plate for rotating the polarization direction of the incident light more toward the central portion, the light exiting the polarizing beam splitter has an intensity becoming lower toward the central portion as compared with the incident light, and the rim strength in an objective lens increases.
公开日期	2008-09-18
申请日期	2008-02-13
状态	未确认
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58230]
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. Optical head device, optical information recorder/reproducer employing the optical head device and optical information recording/reproducing method. WO2008111352A1. 2008-09-18.

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