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	Optical head
	NAKAMURA SHIGERU; TSUNODA YOSHITO; KAKU TOSHIMITSU; KANEDA NORIYA
	1983-11-02
著作权人	HITACHI SEISAKUSHO KK
专利号	JP1983188341A
国家	日本
文献子类	发明申请
其他题名	Optical head
英文摘要	PURPOSE:To obtain a safe information reproducing signal, by providing a reflecting element to feed back a part of light irradiated from a laser to the laser, between the laser and an optical path separating element. CONSTITUTION:The light irradiated from the semiconductor laser 1 is made into a parallel luminous flux by a lens 2 and imaged on a disc 4 by a lens 3 through a semitransparent mirror 8, a part of the light is reflected by the mirror 8 to be laser feedback light 9 and a prescribed luminous amount is fed back to the laser 1 at all times. The reflected light of the disc 4 is all directed to a detection system 7 by a lambda/4 plate 10 and a polarized prism 1 Thus, the prescribed amount of laser feedback light independently of errors in automatic focus control and the information on the disc is attained.
公开日期	1983-11-02
申请日期	1982-04-28
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/68658]
专题	半导体激光器专利数据库
作者单位	HITACHI SEISAKUSHO KK
推荐引用方式 GB/T 7714	NAKAMURA SHIGERU,TSUNODA YOSHITO,KAKU TOSHIMITSU,et al. Optical head. JP1983188341A. 1983-11-02.

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