Optical information recording and reproducing device
文献类型：专利
| 作者 | OONUKI NOBUTAKA; ARIMOTO AKIRA; OSHIMA MASAHIRO; IDE TSUNEO; MORITA TATSUO |
| 发表日期 | 1984-11-29 |
| 专利号 | JP1984210541A |
| 著作权人 | HITACHI SEISAKUSHO KK |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical information recording and reproducing device |
| 英文摘要 | PURPOSE:To prevent the increase of noise due to the return light by oscillating intermittently the laser and setting the frequency of a high frequency current and the length of an optical path so that the reflected return light arrives at the laser emitting point while the laser oscillation is discontinued. CONSTITUTION:The luminous flux emitted from a semiconductor laser 1 is stopped down to a record surface of a recording medium 6 by an objective lens 5 after passing through a collimator lens 2a, polarized beam splitter 3 and a 1/4 wavelength plate 4. The luminous flux is reflected by the surface 7 and converted into a linear polarized light having the polarizing direction orthogonal to the original luminous flux. Then a current obtained by superposing a high frequency current to a direct current is impressed to the laser 1, and the laser is oscillated intermittently in a cycle of a high frequency to obtain many modes. The frequency of the high frequency current and the length of an optical path are set so that the phase difference theta between the oscillation light and the return light satisfies the conditions of an inequality (n: refractive index of the medium 6) at a light emitting point. As a result, the return light reaches the light emitting point while the laser oscillation is discontinued. |
| 公开日期 | 1984-11-29 |
| 申请日期 | 1983-05-13 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68680]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | HITACHI SEISAKUSHO KK |
| 推荐引用方式 GB/T 7714 | OONUKI NOBUTAKA,ARIMOTO AKIRA,OSHIMA MASAHIRO,et al. Optical information recording and reproducing device. JP1984210541A. 1984-11-29. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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