Light quantity control device
文献类型：专利
| 作者 | USHIO YUKIHIDE |
| 发表日期 | 1989-09-20 |
| 专利号 | JP1989235644A |
| 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 enable stable control of light quantity without being affected by the characteristics of temperature drift specific to a semiconductor laser by performing sequential control of light quantity at a specified slight time interval when the semiconductor laser is converged to a target value. CONSTITUTION:A microcomputer 1 sets a continuous ON time of internal timer for a semiconductor laser LD to, e.g., 2musec. Next the computer starts A/D conversion of an output from a light intensity conversion circuit 17, and judges if an A/D conversion value agrees to a prestored light quantity control value when the conversion process ends. If both do not agree, the microcomputer judges if the time of the internal timer in up, and if both agree, the microcomputer sets an OFF time of the internal timer for the semiconductor laser LD to, e.g., a few mu seconds after the port B of the microcomputer is disconnected. Then the time count is started. After this, the microcomputer stands by until the time of the internal timer is up and connects the port B, and further selects a continuous ON time of the internal timer for the semiconductor laser LD. |
| 公开日期 | 1989-09-20 |
| 申请日期 | 1988-03-16 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68979]  |
| 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 | USHIO YUKIHIDE. Light quantity control device. JP1989235644A. 1989-09-20. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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