Optical pickup device
文献类型：专利
| 作者 | YAMANAKA YUTAKA; SAKAGUCHI MITSUTO |
| 发表日期 | 1985-11-26 |
| 专利号 | JP1985237648A |
| 著作权人 | 日本電気株式会社 |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical pickup device |
| 英文摘要 | PURPOSE:To improve noise characteristics by controlling the output of a semiconductor laser so that the detection output of a photodetector which detects the quantity of transmitted light of a variable optical attenuating element installed in an optical system is a specific value. CONSTITUTION:The projection light of the semiconductor laser 1 passes through a collimator lens 2 and the variable optical attenuating element 14 such as a TN type liquid crystal element and is reflected by a beam splitter 3 to enter the photodetector 15. Its output is inputted to a laser output control circuit 16, which controls the driving current of the laser 1 so that the output of the photodetector 6 is constant. Consequently, constant light power is obtained on a recording medium 6, so the S/N ratio during reproducing operation is improved. |
| 公开日期 | 1985-11-26 |
| 申请日期 | 1984-05-11 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68722]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | 日本電気株式会社 |
| 推荐引用方式 GB/T 7714 | YAMANAKA YUTAKA,SAKAGUCHI MITSUTO. Optical pickup device. JP1985237648A. 1985-11-26. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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