Optical signal processing unit
文献类型：专利
| 作者 | TAKAHASHI TAKEO; NAKAJIMA MITSUYOSHI; KONDOU TAKAHIKO |
| 发表日期 | 1985-06-07 |
| 专利号 | JP1985103529A |
| 著作权人 | HITACHI IRUMA DENSHI KK |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical signal processing unit |
| 英文摘要 | PURPOSE:To decrease noise without producing radiation by monitoring a laser light of a laser element in an optical pickup device of an optical video disc device so as to apply negative feedback to an applied current of the laser element. CONSTITUTION:A laser light 2 irradiated from a semiconductor laser element 1 is separated into three laser lights by a diffraction grating 4 and made incident to a half mirror 5. The laser light 12 reflected on an optical disc 11 is collected into three points on a 3-spot photodetector 16, where the light is converted into an information signal for a video signal or a sound signal or the like, a focusing signal and a track signal. An electric signal proportional to the luminous amount of the laser light 6 incident to a photodiode 8 is fed back to the applied current of the laser element 1 via an inverse amplifier 9 and a capacitor C so as to keep the luminous amount of the laser light 6 to a constant value thereby decreasing an SCOOP noise. |
| 公开日期 | 1985-06-07 |
| 申请日期 | 1983-11-11 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/59339]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | HITACHI IRUMA DENSHI KK |
| 推荐引用方式 GB/T 7714 | TAKAHASHI TAKEO,NAKAJIMA MITSUYOSHI,KONDOU TAKAHIKO. Optical signal processing unit. JP1985103529A. 1985-06-07. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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