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	Laser control device
	INUKAI, KATSUMI
	2004-11-18
著作权人	BROTHER KOGYO KABUSHIKI KAISHA
专利号	US20040228374A1
国家	美国
文献子类	发明申请
其他题名	Laser control device
英文摘要	To achieve strong-illumination and weak-illumination of a laser beam onto a photo-sensitive drum, a laser control device controls an LD drive current switching circuit to switch between drive currents generated by an LD-bright-lighting current drive control circuit and drive currents generated by an LD-dim-lighting current drive control circuit, and applies the selected drive currents to a semiconductor laser element. The laser beam from the semiconductor laser element is detected by a photodiode, and the drive current is adjusted by feedback control based on the detected optical intensity. Since a detection signal from the photodiode is amplified not only when the laser beam is illuminating strongly but also when the laser beam is illuminating weakly, even tiny variations in the optical intensity during weak illumination can be detected clearly and can be reflected in feedback control. Thus, the laser control device feeds back the optical intensity of the laser beam to ensure that the optical intensity of the laser beam is kept constant.
公开日期	2004-11-18
申请日期	2004-05-12
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/61089]
专题	半导体激光器专利数据库
作者单位	BROTHER KOGYO KABUSHIKI KAISHA
推荐引用方式 GB/T 7714	INUKAI, KATSUMI. Laser control device. US20040228374A1. 2004-11-18.

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