Diffraction grating, optical pickup device and optical disc apparatus
文献类型：专利
| 作者 | YAMAZAKI, KAZUYOSHI |
| 发表日期 | 2012-08-28 |
| 专利号 | US8254237 |
| 著作权人 | HITACHI MEDIA ELECTRONICS CO., LTD. |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Diffraction grating, optical pickup device and optical disc apparatus |
| 英文摘要 | An optical pickup device includes a semiconductor laser which emits a light beam, first and second objective lenses which focus the light beam onto a first and second optical disc, respectively, a grating which branches a light beam reflected from the second optical disc, an optical detector having a plurality of light receiving parts, which receives light beams branched by the grating, and an actuator which displaces the first and second objective lenses in a radial direction of the first optical disc and the second optical disc. The grating has a first area on which a 0-order diffraction light beam and a +1-order diffraction light beam upon reflection at the second optical disc enter, and a second area on which a 0-order diffraction light beam and a −1-order diffraction light beam upon diffraction through the second optical disc enter. |
| 公开日期 | 2012-08-28 |
| 申请日期 | 2011-04-08 |
| 状态 | 授权 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/32922]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | HITACHI MEDIA ELECTRONICS CO., LTD. |
| 推荐引用方式 GB/T 7714 | YAMAZAKI, KAZUYOSHI. Diffraction grating, optical pickup device and optical disc apparatus. US8254237. 2012-08-28. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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