Semiconductor laser drive apparatus, optical write apparatus, imaging apparatus, and semiconductor laser drive method
文献类型：专利
| 作者 | ONO, KENICHI |
| 发表日期 | 2005-07-13 |
| 专利号 | EP1439619A3 |
| 著作权人 | RICOH COMPANY, LTD. |
| 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 |
| 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. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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