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	Microphone
	FUJIMURA KATSUNORI; MATSUMOTO MICHIO
	1984-08-31
著作权人	MATSUSHITA DENKI SANGYO KK
专利号	JP1984152793A
国家	日本
文献子类	发明申请
其他题名	Microphone
英文摘要	PURPOSE:To stabilize photovoice conversion by reflecting laser light by a diaphragm arranged in parallel with output plane of a semiconductor laser controlled to a prescribed temperature, feeding back the light positively to an active substance in the laser and photoelectric-converting the output change caused by interference. CONSTITUTION:The laser light is reflected in rsponse to acoustic vibration on a diaphragm 21 arranged in parallel with the output plane of the semiconductor laser 22. The reflected laser light is fed back positively to the active substance of the laser 22, the output causing a change by interference is led to an optical fiber 19, photoelectric-converted and amplified by a circuit (not shown), and outputted as a voice current through a band pass filter. On the other hand, a temperature sensor 17 is provided near the semiconductor laser 22 and the temperature is kept constant by changing the direction of current of a Peltier element 18 foward and reverse so as to heat or cool the laser 22. Further, a corrugated heat sink 20 is formed. Then, the mode jumping of the semiconductor element due to temperature change is prevented for stabilizing the output.
公开日期	1984-08-31
申请日期	1983-02-18
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/62873]
专题	半导体激光器专利数据库
作者单位	MATSUSHITA DENKI SANGYO KK
推荐引用方式 GB/T 7714	FUJIMURA KATSUNORI,MATSUMOTO MICHIO. Microphone. JP1984152793A. 1984-08-31.

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