Light emitting element driver

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	Light emitting element driver
其他题名	Light emitting element driver
	HASHIMOTO HIROSHI; RISHIDA YASUMASA; INUYAMA SATOHIKO; ISHIZU MASANORI; KIMIZUKA JUNICHI
	1991-07-30
专利权人	CANON INC
公开日期	1991-07-30
授权国家	日本
专利类型	发明申请
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.
其他摘要	用途：为了阻止由于恒流供电装置故障而冲入发光元件的故障电流，通过提供发光元件，恒流供电装置向发光元件提供恒定电流并提供限流装置限制两者之间的冲击故障电流。组成：假设恒流电路52提供的电流由于恒流电路52中的MPU 9的故障或晶体管（TR）5的故障等而增加，并且故障电流到达附近在半导体激光器1的最大额定电流，然后设置电阻器63的电阻，使得TR 62的基极 - 发射极电压接近例如0.7V。因此，当电阻器63两端的电压达到接近0.7V时，TR 62导通以切断基极电流从电阻器64流到TR 6然后TR 61断开以断开电流路径从电流开关电路51到恒流电路52.因此，防止了半导体激光器1的损坏。
申请日期	1989-12-05
专利号	JP1991175778A
专利状态	失效
申请号	JP1989314210
公开（公告）号	JP1991175778A
IPC 分类号	B41J2/44 \| G03G15/04 \| H01S5/042 \| H04N1/036 \| 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/181661/69079
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[P]. 1991-07-30.

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