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	Semiconductor laser driving circuit
	SAKURAI TATSUAKI; EMA HIDETOSHI
	1990-09-27
著作权人	RICOH CO LTD
专利号	JP1990243363A
国家	日本
文献子类	发明申请
其他题名	Semiconductor laser driving circuit
英文摘要	PURPOSE:To relax the division accuracy of both emission time and emission power to realize a multiple gradation of an apparatus by constituting said apparatus from a driving current setting circuit for putting a driving current determined by the combination of an emission timing signal with the emission power signal of a power setting circuit upon a bias current and for causing the obtained current to flow through a semiconductor laser. CONSTITUTION:Under an oscillated threshold current Ith, a semiconductor laser LED emits light and laser-generates oscillation above said oscillated threshold current Ith. On the other hand, an apparatus is provided with a timing generator circuit 3 for a digital signal with n=4 bits D3, D2, D1, D0 expressing 16 gradations relative to one picture element to be inputted to and with a power setting circuit 4. Also, said apparatus is provided with a driving current setting circuit 5 for putting a driving current upon a bias current by a bias setting circuit 2 and for causing the obtained current to flow through a semiconductor laser 1 according to data on the emission time and emission power outputted from said timing generator circuit 3 and power setting circuit 4. The current value of said driving current setting circuit 5 is determined by timing through a specified current control signal ICONT.
公开日期	1990-09-27
申请日期	1989-03-17
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/69052]
专题	半导体激光器专利数据库
作者单位	RICOH CO LTD
推荐引用方式 GB/T 7714	SAKURAI TATSUAKI,EMA HIDETOSHI. Semiconductor laser driving circuit. JP1990243363A. 1990-09-27.

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