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	Driving method for semiconductor laser of laser printer
	HAMAGUCHI IWAO; SHIBATA ISAMU
	1983-06-25
著作权人	RICOH KK
专利号	JP1983106953A
国家	日本
文献子类	发明申请
其他题名	Driving method for semiconductor laser of laser printer
英文摘要	PURPOSE:To reproduce the half-tone with high precision, by comparing the output signal from a photodetector with a gamma-corrected information signal in a differential amplifier and controlling the driving current of a semiconductor laser by the difference signal. CONSTITUTION:A partial optical output L2 outputted from a semiconductor laser 2 is detected by a photodetector 11, and the detected output is amplified in an operational amplifier OP2 and is applied to one input of a differential amplifier OP3. An input voltage Vi of the information signal to a laser printer is inputted to a gamma correcting circuit 10 and is gamma-corrected by operational amplifiers OP4 and OP5, a ladder-type circuit, etc., and the gamma-corrected information signal is applied to the other input of the amplfier OP3. The output signal from the detector 11 is compared with the gamma-corrected information signal in the amplifier OP3, and a driving circuit 12 of the laser is controlled by the difference signal to control the driving current flowed to the semiconductor laser 2, and thus, the half-tone is reproduced with a high precision.
公开日期	1983-06-25
申请日期	1981-12-19
状态	失效
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/59288]
专题	半导体激光器专利数据库
作者单位	RICOH KK
推荐引用方式 GB/T 7714	HAMAGUCHI IWAO,SHIBATA ISAMU. Driving method for semiconductor laser of laser printer. JP1983106953A. 1983-06-25.

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