Optical pickup device
文献类型：专利
| 作者 | KATAYAMA RYUICHI; ISHIKAWA MAKOTO |
| 发表日期 | 1990-01-16 |
| 专利号 | JP1990010525A |
| 著作权人 | NEC CORP |
| 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 obtain a small and sufficient signal-to-noise ratio by using a semiconductor laser having characteristics in which an optical output discontinuously changes with a threshold current, and the threshold current changes according to a coupling quantity with reflection returning light from the outside. CONSTITUTION:The semiconductor laser having the characteristics, in which the optical output discontinuously changes by a certain applied current and the threshold current to be the applied current changes according to the coupling quantity with the reflection returning light from the outside, is used. That is, the applied current-optical output characteristics of the semiconductor laser change according to the coupling quantity with the reflection returning light, and the optical output discontinuously changes at the threshold current. By detecting the change at the optical output of the semiconductor laser, and reproducing information recorded on an optical recording medium, the fluctuation of the optical output of the semiconductor laser becomes larger as the discontinuous quantity of the optical output at the threshold current becomes larger. Thus, the sufficient signal-to-noise ratio can be obtained. In addition, the above process can be executed without damaging an advantage that the size of the optical pickup device is small. |
| 公开日期 | 1990-01-16 |
| 申请日期 | 1988-06-29 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/70851]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | NEC CORP |
| 推荐引用方式 GB/T 7714 | KATAYAMA RYUICHI,ISHIKAWA MAKOTO. Optical pickup device. JP1990010525A. 1990-01-16. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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