Optical head device and optical information recording or reproducing apparatus
文献类型：专利
| 作者 | KATAYAMA, RYUICHI |
| 发表日期 | 2009-10-15 |
| 专利号 | US20090257339A1 |
| 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 or reproducing apparatus |
| 英文摘要 | There is disclosed an optical head apparatus and an optical information recording or reproducing apparatus capable of obtaining a high light output at a recording time, and a high S/N at a reproducing time with respect to any of disks of next-generation, DVD, and CD standards. Light having a wavelength of 400 nm emitted from a semiconductor laser is almost all reflected by a beam splitter, and condensed on a disk of the next-generation standard. Light having a wavelength of 660 nm emitted from a semiconductor laser is almost all reflected by a beam splitter, almost all transmitted through the beam splitter, and condensed on the disk of the DVD standard. Light having a wavelength of 780 nm emitted from a semiconductor laser is almost all reflected by a beam splitter, almost all transmitted through the beam splitters and condensed on the disk of the CD standard. Reflected light from the disk is almost all transmitted through the beam splitters and received by a photodetector. |
| 公开日期 | 2009-10-15 |
| 申请日期 | 2009-05-29 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/58435]  |
| 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 or reproducing apparatus. US20090257339A1. 2009-10-15. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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