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	Optical information recording and reproducing device
	KITAGAWA SEIJI; YOSHIKAWA SEIJI; TAKEMURA HARUHIKO
	1986-09-25
著作权人	オリンパス光学工業株式会社
专利号	JP1986216141A
国家	日本
文献子类	发明申请
其他题名	Optical information recording and reproducing device
英文摘要	PURPOSE:To detect the linearity of quantum efficiency of a semiconductor laser by discriminating the presence or absence of deterioration of a light source from the drive current of the light source and the intensity of the optical output. CONSTITUTION:A photodetector 2 detects the light emitted from the rear side of a semiconductor laser 1 and delivers a reference signal corresponding to the reproduction mode through the 1st signal generating means 4. While a reference signal corresponding to the information record or erasion mode is delivered from the 2nd signal generating means 5. A control means 6 is controlled by the output signal of a comparator 3 which is compared with each reference signal. The control output of the means 6 is applied to the 1st drive means 7 in case a light source is driven by the weak output light and to the means 7 and then to the 2nd drive means 8 as a control signal when the light source is driven by the intensive output light respectively. At the same time, the input signal is supplied to the means 5 and the means 8 to change the light output of the light source and functions to control the light source to a desired level with high stability.
公开日期	1986-09-25
申请日期	1985-03-20
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/68771]
专题	半导体激光器专利数据库
作者单位	オリンパス光学工業株式会社
推荐引用方式 GB/T 7714	KITAGAWA SEIJI,YOSHIKAWA SEIJI,TAKEMURA HARUHIKO. Optical information recording and reproducing device. JP1986216141A. 1986-09-25.

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