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	Light emitting element driver
	HASHIMOTO HIROSHI; RISHIDA YASUMASA; INUYAMA SATOHIKO; ISHIZU MASANORI; KIMIZUKA JUNICHI
	1991-07-30
著作权人	CANON INC
专利号	JP1991175778A
国家	日本
文献子类	发明申请
其他题名	Light emitting element driver
英文摘要	PURPOSE:To block a fault current rushed into a light emitting element due to malfunction of a constant current supply means by providing the light emitting element, the constant current supply means supplying a constant current to the light emitting element and providing a current limit means limiting a rush fault current between the both. CONSTITUTION:Suppose that a current supplied by a constant current circuit 52 is increased due to a malfunction of an MPU 9 in the constant current circuit 52 or a fault of a transistor(TR) 5 or the like and the fault current reaches the vicinity of the maximum rating current of a semiconductor laser 1, then the resistance of a resistor 63 is set so that the base-emitter voltage of a TR 62 is nearly, e.g., 0.7V. Thus, when a voltage across the resistor 63 reaches nearly 0.7V, the TR 62 is turned on to cut off the flowing of a base current from the resistor 64 to a TR 6 Then the TR 61 is turned off to disconnect the current path from a current switching circuit 51 to the constant current circuit 52. Thus, the destruction of the semiconductor laser 1 is prevented.
公开日期	1991-07-30
申请日期	1989-12-05
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/69079]
专题	半导体激光器专利数据库
作者单位	CANON INC
推荐引用方式 GB/T 7714	HASHIMOTO HIROSHI,RISHIDA YASUMASA,INUYAMA SATOHIKO,et al. Light emitting element driver. JP1991175778A. 1991-07-30.

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