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	Optical pickup device and optical disc apparatus
	YAMAZAKI, KAZUYOSHI; KAWAMURA, TOMOTO
	2013-07-16
著作权人	HITACHI MEDIA ELECTRONICS CO., LTD.
专利号	US8488425
国家	美国
文献子类	授权发明
其他题名	Optical pickup device and optical disc apparatus
英文摘要	An optical pickup device including: a laser diode for emitting laser light; an objective lens which irradiates an optical beam emitted from the laser diode; an actuator which displaces the objective lens in a radius direction of the optical disc; a grating for branches an optical beam reflected by an information recording layer into plural regions; and one photodetector having plural light receiving parts for receiving the branched optical beams, wherein the photodetector has a first light receiving part which detects zero-th order grating diffracted light and plural second light receiving parts which detecting grating diffracted light having an order not less than that of ±first order grating diffracted light; a detected signal of the zero-th order grating diffracted light is defined as a reproduction signal; and a detected signal of the grating diffracted light is defined as a signal for servo controlling.
公开日期	2013-07-16
申请日期	2010-11-29
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/32895]
专题	半导体激光器专利数据库
作者单位	HITACHI MEDIA ELECTRONICS CO., LTD.
推荐引用方式 GB/T 7714	YAMAZAKI, KAZUYOSHI,KAWAMURA, TOMOTO. Optical pickup device and optical disc apparatus. US8488425. 2013-07-16.

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