Optical head device and optical information recording/reproducing device
文献类型：专利
| 作者 | KATAYAMA, RYUICHI |
| 发表日期 | 2010-12-09 |
| 专利号 | US20100309770A1 |
| 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 recording/reproducing device |
| 英文摘要 | To provide an optical head device and an optical information recording/reproducing device for recording/reproducing a signal on/from an optical recording medium having two recording layers without generating the disturbance on the track error signal detected with differential push-pull method even if the interval between the target layer and the non-target layer changes. The light beam emitted from a semiconductor laser is divided into a zeroth order main beam and a positive and a negative first order diffracted light sub-beams by a diffractive optical element. The light beams are applied onto a disk by an objective lens. The reflected light beam of the main beam and reflected light beams of the sub-beams from the disk are received by a photodetector. From the output of the photodetector, a differential push-pull signal is calculated, and used as a track error signal. The sub-beams become Laguerre-Gauss beams by the diffractive optical element. |
| 公开日期 | 2010-12-09 |
| 申请日期 | 2007-11-09 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/58168]  |
| 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 recording/reproducing device. US20100309770A1. 2010-12-09. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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