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	Diffractive optical element and optical pickup
	SHINODA, MASAHISA; MATSUBARA, DAISUKE; NAKAI, KENYA; NAKAHARA, HIRONORI
	2010-04-22
著作权人	MITSUBISHI ELECTRIC CORPORATION
专利号	US20100097917A1
国家	美国
文献子类	发明申请
其他题名	Diffractive optical element and optical pickup
英文摘要	An optical pickup with a simplified structure in which, according to the type of optical disc, diffracted light from three types of laser light can be directed efficiently onto a photodetector and appropriate focus control can be performed based on the signals detected by the photodetector, and a diffractive optical element that can be used in the optical pickup, which has a semiconductor laser 10 that can emit three types of laser light, a diffractive optical element 42 that diffracts the laser light reflected from the optical disc 31, and a single photodetector 43 that detects the diffracted light exiting the diffractive optical element 42. The diffractive optical element 42 is structured so that 0-order light is the maximal component of the diffracted light generated from each of two of three types of laser light, the two having close wavelengths (with a small wavelength difference), and +1-order light or −1-order light is the maximal component of the diffracted light generated from the remaining one type of laser light.
公开日期	2010-04-22
申请日期	2008-02-19
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/58231]
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	SHINODA, MASAHISA,MATSUBARA, DAISUKE,NAKAI, KENYA,et al. Diffractive optical element and optical pickup. US20100097917A1. 2010-04-22.

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