Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method

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	Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method
其他题名	Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method
	ONO, KENICHI
	2005-07-13
专利权人	RICOH COMPANY, LTD.
公开日期	2005-07-13
授权国家	欧洲专利局
专利类型	发明申请
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.
其他摘要	公开了一种半导体激光器驱动装置和方法，以便获得最佳激光发射脉冲，该脉冲可以减少可能引起光电导体雾化和劣化的固有光发射，并且还减少导通延迟。具体地，基于延迟控制信号以延迟单元延迟发光命令信号，从而输出调制信号。发光命令信号和延迟信号在阈值信号发生单元处逻辑地加到来自外部源的命令信号，从而输出阈值ON信号。调制信号和阈值ON信号分别驱动调制电流开关和阈值电流开关，从而产生半导体激光器驱动电流。根据从外部源提供的采样保持信号对阈值电流进行采样，并且对采样的阈值电流执行APC。在差分量子效率检测单元中，执行基于用于获得预定量的光的电流和用于获得预定量的光的一部分的电流来确定差分量子效率的操作，并且计算发光电流。通过将计算出的发光电流和可以从外部设定的任意电流相加，可以获得用于切换半导体激光器的调制电流。
主权项	A semiconductor laser drive apparatus that modulates a semiconductor laser according to a modulation signal and induces the semiconductor laser to emit light, the apparatus comprising: a control unit that is adapted to supply a fixed bias current during a light emission off time, and start supplying a predetermined current that is less than a light emission threshold current right before a light emission time.
申请日期	2004-01-15
专利号	EP1439619A3
专利状态	授权
申请号	EP2004000763
公开（公告）号	EP1439619A3
IPC 分类号	B41J2/44 \| H01L31/072 \| H01S5/042 \| H01S5/062 \| H01S5/068 \| H01S5/0683 \| H01S5/50 \| H04N1/036 \| H04N1/113
专利代理人	-
代理机构	SCHWABE - SANDMAIR - MARX
文献类型	专利
条目标识符	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[P]. 2005-07-13.

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