Semiconductor laser drive circuit

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	Semiconductor laser drive circuit
其他题名	Semiconductor laser drive circuit
	YOSHIKAWA YUKIO; ISHII TAKESHI; OYAMA YOSHIHIRO; SATO SHINICHI; MORIYA KAZUMASA
	1991-10-16
专利权人	富士通株式会社
公开日期	1991-10-16
授权国家	日本
专利类型	发明申请
摘要	PURPOSE:To obtain a semiconductor laser drive circuit excellent in safety by a method wherein at least two or more forced quenching circuits independent of each other are provided. CONSTITUTION:A semiconductor laser drive circuit is composed of a current feed circuit which supplies a drive current to a laser diode 1a responding to a lighting signal LDON to start it emitting light, a first forced quenching circuit which stops feeding a drive current to the laser diode 1a to forcedly turn off it responding to a forced stop signal LDINH 1, and a second forced stop circuit which responds to a forced stop signal LDINH 2. When an emergency occurs, the forced stop signal LDINH 1 is made to turn high in level, a transistor 12 becomes non-conductive, the second forced stop signal LDINH 2 is made to turn low in level, a transistor 15 becomes conductive, a voltage between the anode and the cathode of the laser diode 1a becomes smaller than a forward voltage, a current fed from a power supply line Vcc is made to flow through a transistor 15 bypassing the laser diode 1a, so that the laser diode 1a is forcedly turned OFF.
其他摘要	目的：通过一种方法获得安全性极佳的半导体激光器驱动电路，其中提供至少两个或更多个彼此独立的强制淬火电路。组成：半导体激光器驱动电路由一个电流馈电电路组成，该电流馈电电路响应点亮信号LDON向激光二极管1a提供驱动电流以启动它发光，第一个强制熄灭电路停止向激光器提供驱动电流二极管1a响应强制停止信号LDINH 1强制关闭，第二强制停止电路响应强制停止信号LDINH 2.当发生紧急情况时，强制停止信号LDINH 1变为高电平晶体管12变为非导通，第二强制停止信号LDINH2变为低电平，晶体管15变为导通，激光二极管1a的阳极和阴极之间的电压变得小于正向电压，从电源线Vcc馈送的电流流过绕过激光二极管1a的晶体管15，从而强制关断激光二极管1a。
申请日期	1990-02-07
专利号	JP1991232283A
专利状态	失效
申请号	JP1990029098
公开（公告）号	JP1991232283A
IPC 分类号	G11B7/125 \| H01S5/00 \| H01S5/042 \| H01S3/096
专利代理人	-
代理机构	-
文献类型	专利
条目标识符	http://ir.opt.ac.cn/handle/181661/69091
专题	半导体激光器专利数据库
作者单位	富士通株式会社
推荐引用方式 GB/T 7714	YOSHIKAWA YUKIO,ISHII TAKESHI,OYAMA YOSHIHIRO,et al. Semiconductor laser drive circuit. JP1991232283A[P]. 1991-10-16.

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