| Optical head and optical disc apparatus | |
| MAEDA, NOBUYUKI; MORI, HIROMITSU; KAWAMURA, TOMOTO | |
| 2008-12-04 | |
| 著作权人 | HITACHI MEDIA ELECTRONICS CO., LTD. |
| 专利号 | US20080298208A1 |
| 国家 | 美国 |
| 文献子类 | 发明申请 |
| 其他题名 | Optical head and optical disc apparatus |
| 英文摘要 | An optical head includes semiconductor lasers for 455 nm, 655 nm, and 785 nm bands; a polarization change element and a polarizing beam splitter for luminous flux with a wavelength of 455 nm band, a first collimation lens for converting luminous flux having passed through the polarizing beam splitter into parallel flux, a first quarter-wave plate, a BD objective for focusing the flux onto a signal recording surface of BD, a first photo-detector for receiving light reflected by BD, a composite prism for reflecting flux reflected by the splitter and transmitting most of flux from the lasers for 655 nm and 785 nm bands, a second collimation lens for converting flux emitted from the composite lens into parallel flux, a second quarter-wave plate, an objective compatible with HD DVD, DVD, and CD; and a second photo-detector for receiving light reflected by HD DVD, DVD, and CD. |
| 公开日期 | 2008-12-04 |
| 申请日期 | 2008-03-13 |
| 状态 | 失效 |
| 内容类型 | 专利 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/58245]  |
| 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 | MAEDA, NOBUYUKI,MORI, HIROMITSU,KAWAMURA, TOMOTO. Optical head and optical disc apparatus. US20080298208A1. 2008-12-04. |
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