Light quantity control device
文献类型：专利
| 作者 | KIMIZUKA JUNICHI; INUYAMA SATOHIKO; SOYA TAKASHI |
| 发表日期 | 1987-10-16 |
| 专利号 | JP1987235975A |
| 著作权人 | CANON INC |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Light quantity control device |
| 英文摘要 | PURPOSE:To reduce an error at the control of the quantity of a laser beam by changing a laser current by one step and then comparing the quantity of detected light with the delay of a fixed time for converging a transient phenomenon. CONSTITUTION:The quantity of a beam outputted from a laser 1 is detected by a detecting photodiode 8, arithmetically amplified 13 and then A/D converted in a microprocessor MPU14, the digital signal is compared with a reference value selected out of plural reference values stored in a ROM14-2 in accordance with light quantity switching signals S1-S3 and a signal corresponding to the reference value is outputted from the MPU14. The output signal is D/A converted 15 and supplied to a constant current circuit 20 through a current/ voltage converting circuit 18 to control the driving current of the laser 1 through transistors 22, 25, 26, so that quantity of the laser beam is adjusted. If the values of output ports 01-09 of the MPU14 are changed by one bit, the current of the laser 1 is increased like steps, and after the passage of a waiting time for converging the transient variation of driving currents of the converter 15 and amplifiers 19, 21, the quantity of the laser beam is detected. |
| 公开日期 | 1987-10-16 |
| 申请日期 | 1986-04-07 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68852]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | CANON INC |
| 推荐引用方式 GB/T 7714 | KIMIZUKA JUNICHI,INUYAMA SATOHIKO,SOYA TAKASHI. Light quantity control device. JP1987235975A. 1987-10-16. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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