Optical pickup apparatus
文献类型：专利
| 作者 | KOSHIMIZU, YUKI; ICHIKAWA, HIROYUKI |
| 发表日期 | 2013-02-26 |
| 专利号 | US8385182 |
| 著作权人 | SANYO ELECTRIC CO., LTD. |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Optical pickup apparatus |
| 英文摘要 | An optical-pickup apparatus includes: a laser diode; an objective lens; a diffraction grating; a photodetector including main-beam-, first-sub-beam-, and second-sub-beam-light-receiving portions; a quarter-wave plate having either a second area allowing a reflected-laser beam to pass therethrough without polarization or a third area allowing the reflected beam to pass therethrough at a polarization angle different from that of the first area; and a polarizing member having a separate-light-amount ratio set therefor with respect to the reflected beams passing through the second or third area and an area excluding the second or third area from the first area, such that proportions of the reflected beams passing therethrough toward the photodetector are different, thereby decreasing an irradiation level when the first- and second-sub-beam-light-receiving portions are irradiated, as stray light, with the reflected beam reflected from either one, not subjected to a signal-reading operation, of the first- and second-signal-recording layers of an optical disc. |
| 公开日期 | 2013-02-26 |
| 申请日期 | 2011-08-23 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/68425]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | SANYO ELECTRIC CO., LTD. |
| 推荐引用方式 GB/T 7714 | KOSHIMIZU, YUKI,ICHIKAWA, HIROYUKI. Optical pickup apparatus. US8385182. 2013-02-26. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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