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	Optical head device and optical information reproducing device
	KATAYAMA, RYUICHI
	2009-07-30
著作权人	NEC CORPORATION
专利号	US20090190457A1
国家	美国
文献子类	发明申请
其他题名	Optical head device and optical information reproducing device
英文摘要	The light emitted from a semiconductor laser is divided by a diffractive optical element into three light beams which are 0th-order light as the main beam and ±1st-order diffracted lights as the sub-beams, and the track error signals by the main beam and the sub-beams are detected, respectively, by a differential phase detection method. By the effect of the diffractive optical element, the light intensity distributions of the main beam and the sub-beams become different when making incidence on an objective lens. Therefore, when there is radial tilt in a disk, the phases of the track error signals by the main beam and the sub-beams are shifted with each other. Based on the shift in the phases of the track error signals, radial tilt of the disk is detected.
公开日期	2009-07-30
申请日期	2009-02-20
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58392]
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 and optical information reproducing device. US20090190457A1. 2009-07-30.

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