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	Optical head device and optical disc device
	OMAKI MASAYUKI; NAKAI KENYA; TAKESHITA NOBUO
	2013-07-11
著作权人	MITSUBISHI ELECTRIC CORPORATION
专利号	WO2013103057A1
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 and optical disc device
英文摘要	This optical head device (11) is provided with: an optical element (36) for causing an optical beam emitted from a semiconductor laser (34) to be diffracted in transmission, generating a zero-degree-diffraction optical beam and a ±1-degree-diffraction optical beam; and an optical detection element (40) for receiving the zero-degree-diffraction optical beam reflected by an optical disc (2) and the +1-degree-diffraction optical beam. The optical detection element (40) comprises a primary light-receiving unit (400) for receiving the zero-degree-diffraction optical beam, and a first auxiliary light-receiving unit (401) disposed outward from the primary light-receiving unit (400). The first auxiliary light-receiving unit (401) is disposed in a position for detecting a portion of the outer side of the light-receiving spot of the +1-degree-diffraction optical beam, and performs photoelectric conversion of the portion to output an auxiliary detection signal.
公开日期	2013-07-11
申请日期	2012-11-26
状态	未确认
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58824]
专题	半导体激光器专利数据库
作者单位	MITSUBISHI ELECTRIC CORPORATION
推荐引用方式 GB/T 7714	OMAKI MASAYUKI,NAKAI KENYA,TAKESHITA NOBUO. Optical head device and optical disc device. WO2013103057A1. 2013-07-11.

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