Optical recording and reproducing device
文献类型：专利
| 作者 | NIMATA AKIO; MORITSUGU MASAHARU |
| 发表日期 | 1986-08-29 |
| 专利号 | JP1986194649A |
| 著作权人 | FUJITSU LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical recording and reproducing device |
| 英文摘要 | PURPOSE:To deal with even the low output area of output characteristics of a semiconductor laser which has polygonal characteristics by switching and controlling of the by-pass current of a semiconductor laser driving circuit. CONSTITUTION:When the output current Io of a light quantity detector 3 corresponding to a polygonal point becomes equal to the total output current Ipd of the light quantity detector 3, a converted voltage generated by a resistance 7 is applied to an input of a comparing circuit 8 at any time so that it attains to a threshold value Ew. Therefore, when the output of the comparing circuit 8 is '0' while the converted voltage of the resistance 7 is below the threshold value Ew, a multiplexer 93 is triggered with the signal '0' and switched to the side of a low-current attenuator 9 Similarly, when the converted voltage of the resistance 7 is below the threshold value Ew. The output of the comparing circuit 8 is '1' and the multiplexer 93 is triggered to the side of a high- current attenuator 92. Consequently, the light output of the semiconductor laser during reproduction is made constant and a desired light output for recording is obtained over the entire light output range. |
| 公开日期 | 1986-08-29 |
| 申请日期 | 1985-02-22 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68761]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | FUJITSU LTD |
| 推荐引用方式 GB/T 7714 | NIMATA AKIO,MORITSUGU MASAHARU. Optical recording and reproducing device. JP1986194649A. 1986-08-29. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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