Optical head
文献类型：专利
| 作者 | ITO NOBORU; MIZUNO SADAO; SAITO YOICHI; SATO TOSHIO |
| 发表日期 | 1990-06-25 |
| 专利号 | JP1990163986A |
| 著作权人 | MATSUSHITA ELECTRIC IND CO LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical head |
| 英文摘要 | PURPOSE:To keep a best recording and reproduction state by being adjusted to a just-focused state at a recording operation and a reproduction operation and by being adjusted to a slightly defocused state at an erasure operation and to prevent an imperfect erasure operation by a method wherein an electric current to be injected into a waveguide lens is changed and an image-formation position of a light spot is controlled. CONSTITUTION:A waveguide lens 2 is arranged so as to be adjusted to a semiconductor laser 1; a radiated beam of the semiconductor laser 1 is guided to an active layer 25 of the waveguide lens 2 and is emitted from its end face. A refractive index of a clad layer 26 is lower than that of the active layer 25; thereby, the beam is confined and propagated inside the active layer 25. An electric current I1 is injected into the semiconductor laser 1 by using electrode 1 and electrode 4; light is emitted. When an electric current is injected into the waveguide lens 2 by using electrodes 2, 3, 4, a distribution of the refractive index at the active layer 25 and the clad layer 26 is changed. As a result, a wave front of the propagated light in these layers, i.e., a position of a light-emitting point, can be controlled by injection currents I2, I3. A position P of an equivalent light-emitting point is shifted to a direction of an optical axis according to a magnitude of the injection currents I2, I3; an image-formation position of a light spot which has been narrowed by an objective 6 is changed. |
| 公开日期 | 1990-06-25 |
| 申请日期 | 1988-12-16 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/84571]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | MATSUSHITA ELECTRIC IND CO LTD |
| 推荐引用方式 GB/T 7714 | ITO NOBORU,MIZUNO SADAO,SAITO YOICHI,et al. Optical head. JP1990163986A. 1990-06-25. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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