Optical pickup device
文献类型：专利
| 作者 | SHIMADA, NAOTO; YAMAMOTO, HIROAKI; NAKANISHI, NAOKI; NISHIMOTO, MASAHIKO; OKUDA, TAKUYA |
| 发表日期 | 2011-07-12 |
| 专利号 | US7978586 |
| 著作权人 | PANNOVA SEMIC, LLC |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Optical pickup device |
| 英文摘要 | An optical pickup device includes a diffraction grating 12 for separating a light beam emitted from a semiconductor laser element into at least three light beams. The diffraction grating 12 is divided into three regions by a straight line extending in a direction parallel to a tangent line of a track of an optical information recording medium. A second region 12B is divided into a first sub-block 13 and a second sub-block 14 by a straight line extending in a direction parallel to a radius direction of the optical information recording medium. The first sub-block 13 has a phase difference of approximately 180 degrees from the second sub-block 14. The first region 12A has a phase difference of approximately 90 degrees from the first sub-block 13 and has a phase difference of approximately 180 degrees from the third region 12C. |
| 公开日期 | 2011-07-12 |
| 申请日期 | 2007-07-18 |
| 状态 | 授权 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68137]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | PANNOVA SEMIC, LLC |
| 推荐引用方式 GB/T 7714 | SHIMADA, NAOTO,YAMAMOTO, HIROAKI,NAKANISHI, NAOKI,et al. Optical pickup device. US7978586. 2011-07-12. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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