Optical head device, optical information recorder/reproducer employing the optical head device and optical information recording/reproducing method
文献类型：专利
| 作者 | KATAYAMA, RYUICHI |
| 发表日期 | 2008-09-18 |
| 专利号 | WO2008111352A1 |
| 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, optical information recorder/reproducer employing the optical head device and optical information recording/reproducing method |
| 英文摘要 | Between a semiconductor laser and a polarizing beam splitter, a polarization direction control element, including a liquid crystal polymer layer divided into a plurality of concentric circle regions having different optical axis directions, is provided. A voltage is applied to the liquid crystal polymer layer at the time of recording. Since the polarization direction control element acts as a full wavelength plate for incident light, the light exiting the polarizing beam splitter has an intensity distribution identical to that of the incident light and the rim strength in an objective lens lowers. No voltage is applied to the liquid crystal polymer layer at the time of reproduction. Since the polarization direction control element operates as a half wavelength plate for rotating the polarization direction of the incident light more toward the central portion, the light exiting the polarizing beam splitter has an intensity becoming lower toward the central portion as compared with the incident light, and the rim strength in an objective lens increases. |
| 公开日期 | 2008-09-18 |
| 申请日期 | 2008-02-13 |
| 状态 | 未确认 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/58230]  |
| 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, optical information recorder/reproducer employing the optical head device and optical information recording/reproducing method. WO2008111352A1. 2008-09-18. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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