Optical head device and optical information reproducing device
文献类型：专利
| 作者 | KATAYAMA, RYUICHI |
| 发表日期 | 2009-07-30 |
| 专利号 | US20090190457A1 |
| 著作权人 | NEC CORPORATION |
| 国家 | 美国 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical head device and optical information reproducing device |
| 英文摘要 | The light emitted from a semiconductor laser is divided by a diffractive optical element into three light beams which are 0th-order light as the main beam and ±1st-order diffracted lights as the sub-beams, and the track error signals by the main beam and the sub-beams are detected, respectively, by a differential phase detection method. By the effect of the diffractive optical element, the light intensity distributions of the main beam and the sub-beams become different when making incidence on an objective lens. Therefore, when there is radial tilt in a disk, the phases of the track error signals by the main beam and the sub-beams are shifted with each other. Based on the shift in the phases of the track error signals, radial tilt of the disk is detected. |
| 公开日期 | 2009-07-30 |
| 申请日期 | 2009-02-20 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/58392]  |
| 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 reproducing device. US20090190457A1. 2009-07-30. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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