Xi'an Institute of Optics and Precision Mechanics,CAS
Light quantity control device | |
其他题名 | Light quantity control device |
KIMIZUKA JUNICHI; INUYAMA SATOHIKO; SOYA TAKASHI | |
1987-10-16 | |
专利权人 | CANON INC |
公开日期 | 1987-10-16 |
授权国家 | 日本 |
专利类型 | 发明申请 |
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. |
其他摘要 | 目的:通过将激光电流改变一步,然后将检测到的光量与固定时间的延迟进行比较,以便收敛瞬态现象,从而减少控制激光束数量时的误差。组成:从激光器1输出的光束数量由检测光电二极管8检测,算术放大13然后在微处理器MPU14中进行A / D转换,数字信号与从存储的多个参考值中选择的参考值进行比较在ROM14-2中,根据光量切换信号S1-S3,从MPU14输出与参考值对应的信号。输出信号经过D / A转换15并通过电流/电压转换电路18提供给恒流电路20,以通过晶体管22,25,26控制激光器1的驱动电流,从而激光束的数量是调整。如果MPU14的输出端口01-09的值改变一位,则激光器1的电流像步骤一样增加,并且在经过等待时间以收敛转换器15的驱动电流的瞬态变化之后。在放大器19,21中,检测激光束的数量。 |
申请日期 | 1986-04-07 |
专利号 | JP1987235975A |
专利状态 | 失效 |
申请号 | JP1986078095 |
公开(公告)号 | JP1987235975A |
IPC 分类号 | H01S5/06 | B41J2/44 | G03G15/04 | H01S3/103 |
专利代理人 | - |
代理机构 | - |
文献类型 | 专利 |
条目标识符 | 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[P]. 1987-10-16. |
条目包含的文件 | ||||||
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JP1987235975A.PDF(313KB) | 专利 | 开放获取 | CC BY-NC-SA | 请求全文 |
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