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	Semiconductor laser device
	KAKU TOSHIMITSU; SHIGEMATSU KAZUO
	1988-04-20
著作权人	HITACHI LTD
专利号	JP1988090037A
国家	日本
文献子类	发明申请
其他题名	Semiconductor laser device
英文摘要	PURPOSE:To execute high frequency driving only at the time of reproducing and suspending the high frequency driving in recording and erasing modes to expand the life of a semiconductor laser by controlling a switching circuit connected between a semiconductor laser and a high frequency oscillation circuit by an optical disk device mode control signal. CONSTITUTION:The semiconductor laser 1 of the optical disk is directly connected to a high frequency superposing circuit 2 and the periphery of the circuit 2 is electromagnetically shielded 3 to suppress the radiation of electromagnetic waves to the external. A control signal indicating a recording/reproducing/ erasing mode and a data signal at the time of recording are sent from a controller 4 to a laser driving circuit 5 for controlling the circuit 2. The circuit 5 adds the data obtained at the time of recording, and the mode signal obtained at the time of erasing to DC current obtained at the time of reproducing to form a laser driving signal. The circuit 2 is constituted of a high frequency oscillation circuit 10 and a switching circuit 20 for turning on/off the high frequency signal with a mode control signal to execute high frequency driving only at the time of reproducing and suspend the high frequency driving at the time of recording and erasing modes.
公开日期	1988-04-20
申请日期	1986-10-03
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/68892]
专题	半导体激光器专利数据库
作者单位	HITACHI LTD
推荐引用方式 GB/T 7714	KAKU TOSHIMITSU,SHIGEMATSU KAZUO. Semiconductor laser device. JP1988090037A. 1988-04-20.

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