QQ客服 官方微博 反馈留言

	Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method
	ONO, KENICHI
	2005-07-13
著作权人	RICOH COMPANY, LTD.
专利号	EP1439619A3
国家	欧洲专利局
文献子类	发明申请
其他题名	Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method
英文摘要	A semiconductor laser drive apparatus and method are disclosed in order to obtain an optimal laser emission pulse that can reduce inherent light emission that may cause fogging and degradation of a photoconductor and also reduce turn on delay. Specifically, a light emission command signal is delayed at a delay unit based on a delay control signal so that a modulation signal is output. The light emission command signal and the delay signal are logically added to a command signal from an external source at a threshold signal generation unit so that a threshold ON signal is output. The modulation signal and the threshold ON signal respectively drive a modulation current switch and a threshold current switch so that a semiconductor laser drive current is generated. The threshold current is sampled according to a sample hold signal supplied from an external source and APC is performed on the sampled threshold current. In a differential quantum efficiency detection unit, an operation of determining differential quantum efficiency based on a current for obtaining a predetermined amount of light and a current for obtaining a portion of the predetermined amount of light is performed, and a light emission current is calculated. By adding the calculated light emission current and an arbitrary current that may be externally set, a modulation current for switching the semiconductor laser can be obtained.
公开日期	2005-07-13
申请日期	2004-01-15
状态	授权
内容类型	专利
源URL	[http://ir.opt.ac.cn/handle/181661/61053]
专题	半导体激光器专利数据库
作者单位	RICOH COMPANY, LTD.
推荐引用方式 GB/T 7714	ONO, KENICHI. Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method. EP1439619A3. 2005-07-13.

个性服务

查看访问统计

相关权益政策

暂无数据

收藏/分享

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。