Pickup device for optical disk
文献类型：专利
| 作者 | MORI MASATAKA |
| 发表日期 | 1989-07-05 |
| 专利号 | JP1989169746A |
| 著作权人 | MITSUBISHI ELECTRIC CORP |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Pickup device for optical disk |
| 英文摘要 | PURPOSE:To shorten the vertical mode interval of returning beams and to reduce noises of a laser beam by making the length of a single mode fiber 100mm or above. CONSTITUTION:A laser beam emitted from a semiconductor 1 is made incident on the single mode fiber 3 of 100mm long or above by a condensor lens 2. The laser beam passing through the fiber 3 is made to parallel rays of light by a collimator lens 4, then the rays of light pass through a polarizing beam splitter 5 and a lambda/4 plate 6, then condensed by a condensor lens 7 to form a spot on an optical disk 8. A reflected beam is bent by the beam splitter 5 toward a condensor lens 9 and condensed on a photodiode 10. The vertical mode interval of the laser diode is reversely proportionate to the length of an external resonator, hence the longer the vertical mode interval is the larger the noises are. Since the single mode fiber 3 is made to 100mm or above, the resonator becomes longer, and the vertical mode interval becomes shorter, as a result, noises become smaller. |
| 公开日期 | 1989-07-05 |
| 申请日期 | 1987-12-23 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68958]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | MITSUBISHI ELECTRIC CORP |
| 推荐引用方式 GB/T 7714 | MORI MASATAKA. Pickup device for optical disk. JP1989169746A. 1989-07-05. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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