Driving method for semiconductor laser of laser printer | |
HAMAGUCHI IWAO; SHIBATA ISAMU | |
1983-06-25 | |
著作权人 | RICOH KK |
专利号 | JP1983106953A |
国家 | 日本 |
文献子类 | 发明申请 |
其他题名 | Driving method for semiconductor laser of laser printer |
英文摘要 | PURPOSE:To reproduce the half-tone with high precision, by comparing the output signal from a photodetector with a gamma-corrected information signal in a differential amplifier and controlling the driving current of a semiconductor laser by the difference signal. CONSTITUTION:A partial optical output L2 outputted from a semiconductor laser 2 is detected by a photodetector 11, and the detected output is amplified in an operational amplifier OP2 and is applied to one input of a differential amplifier OP3. An input voltage Vi of the information signal to a laser printer is inputted to a gamma correcting circuit 10 and is gamma-corrected by operational amplifiers OP4 and OP5, a ladder-type circuit, etc., and the gamma-corrected information signal is applied to the other input of the amplfier OP3. The output signal from the detector 11 is compared with the gamma-corrected information signal in the amplifier OP3, and a driving circuit 12 of the laser is controlled by the difference signal to control the driving current flowed to the semiconductor laser 2, and thus, the half-tone is reproduced with a high precision. |
公开日期 | 1983-06-25 |
申请日期 | 1981-12-19 |
状态 | 失效 |
内容类型 | 专利 |
源URL | [http://ir.opt.ac.cn/handle/181661/59288] ![]() |
专题 | 半导体激光器专利数据库 |
作者单位 | RICOH KK |
推荐引用方式 GB/T 7714 | HAMAGUCHI IWAO,SHIBATA ISAMU. Driving method for semiconductor laser of laser printer. JP1983106953A. 1983-06-25. |
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