Optical head device and optical information recoding/reproducing device
文献类型：专利
| 作者 | KATAYAMA, RYUICHI |
| 发表日期 | 2008-11-06 |
| 专利号 | WO2008132891A1 |
| 著作权人 | NEC CORPORATION |
| 国家 | 世界知识产权组织 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical head device and optical information recoding/reproducing device |
| 英文摘要 | Light outputted from a semiconductor laser (1) is split into a main beam and two sub-beams by a diffraction optical element (3) and are collected to a recording layer of a disc (7). Reflection light of the main beam reflected by the recording layer of the disc (7) and reflection light of the two sub-beams pass through a phase filter (11), and are received by an optical detector (10). The phase filter (11) is provided with a first region and a second region separated by a straight line which passes through an optical axis and corresponds to an information track direction, and a phase difference of 180° is made between light passing through the first region and light passing through the second region. A differential push-pull signal is calculated based on output from the optical detector (10). |
| 公开日期 | 2008-11-06 |
| 申请日期 | 2008-03-19 |
| 状态 | 未确认 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/58248]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | NEC CORPORATION |
| 推荐引用方式 GB/T 7714 | KATAYAMA, RYUICHI. Optical head device and optical information recoding/reproducing device. WO2008132891A1. 2008-11-06. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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