Optical head and information recording apparatus

OPT OpenIR > 半导体激光器专利数据库

	Optical head and information recording apparatus
其他题名	Optical head and information recording apparatus
	NAKAMURA, SHIGERU; ARIMOTO, AKIRA; NAKAO, TAKESHI; UMEDA, MARIKO
	1994-11-01
专利权人	HITACHI, LTD., A CORPORATION OF JAPAN
公开日期	1994-11-01
授权国家	美国
专利类型	授权发明
摘要	Disclosed herein is a compact, adjustment-free, unitary optical head wherein diffraction grating made of a birefrigence material and having convexities and concavities of grating grooves so set that the difference of their optical path lengths is some multiples and a half of the wavelength for an ordinary beam and an extraordinary beam, a diffraction grating providing astigmatisms to +/-1 order beams, a quarter wavelength plate, and other optical components, are interposed between a semiconductor laser and a focussing lens and are stored inside an optical head body filled with a dry nitrogen gas. A focus error detection signal is obtained from the difference of the degrees of modulation of the +/-1 order reflected beams by pre-wobbled pits, and adjustment of the optical beam can be carried out by driving the body by a two-directional head actuator.
其他摘要	本发明公开了一种紧凑，无需调整的整体光学头，其中衍射光栅由双折射材料制成并具有光栅凹槽的凸面和凹面，因此设定它们的光程长度的差值是波长的一半和一半。普通光束和非常光束，向+/- 1级光束，四分之一波长板和其它光学元件提供像散的衍射光栅插入半导体激光器和聚焦透镜之间，并存储在填充有光学头的光学头体内。干燥的氮气。通过预摆动凹坑的+/- 1级反射光束的调制度的差异获得聚焦误差检测信号，并且可以通过由双向头驱动身体来执行光束的调节。执行器。
申请日期	1992-04-08
专利号	US5361244
专利状态	失效
申请号	US07/865114
公开（公告）号	US5361244
IPC 分类号	G11B7/135 \| G11B7/09 \| G11B7/22 \| H01S5/00 \| H01S5/022 \| G11B7/00
专利代理人	-
代理机构	ANTONELLI,TERRY,STOUT & KRAUS
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/33401
专题	半导体激光器专利数据库
作者单位	HITACHI, LTD., A CORPORATION OF JAPAN
推荐引用方式 GB/T 7714	NAKAMURA, SHIGERU,ARIMOTO, AKIRA,NAKAO, TAKESHI,et al. Optical head and information recording apparatus. US5361244[P]. 1994-11-01.

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