Laser control device | |
INUKAI, KATSUMI | |
2004-11-18 | |
著作权人 | BROTHER KOGYO KABUSHIKI KAISHA |
专利号 | US20040228374A1 |
国家 | 美国 |
文献子类 | 发明申请 |
其他题名 | Laser control device |
英文摘要 | To achieve strong-illumination and weak-illumination of a laser beam onto a photo-sensitive drum, a laser control device controls an LD drive current switching circuit to switch between drive currents generated by an LD-bright-lighting current drive control circuit and drive currents generated by an LD-dim-lighting current drive control circuit, and applies the selected drive currents to a semiconductor laser element. The laser beam from the semiconductor laser element is detected by a photodiode, and the drive current is adjusted by feedback control based on the detected optical intensity. Since a detection signal from the photodiode is amplified not only when the laser beam is illuminating strongly but also when the laser beam is illuminating weakly, even tiny variations in the optical intensity during weak illumination can be detected clearly and can be reflected in feedback control. Thus, the laser control device feeds back the optical intensity of the laser beam to ensure that the optical intensity of the laser beam is kept constant. |
公开日期 | 2004-11-18 |
申请日期 | 2004-05-12 |
状态 | 失效 |
内容类型 | 专利 |
源URL | [http://ir.opt.ac.cn/handle/181661/61089] ![]() |
专题 | 半导体激光器专利数据库 |
作者单位 | BROTHER KOGYO KABUSHIKI KAISHA |
推荐引用方式 GB/T 7714 | INUKAI, KATSUMI. Laser control device. US20040228374A1. 2004-11-18. |
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