Optical pick-up apparatus with tracking error detection by detection of amount of light in fan field
文献类型：专利
| 作者 | YAMAZAKI, TAKESHI |
| 发表日期 | 1997-03-04 |
| 专利号 | US5608695 |
| 著作权人 | OLYMPUS OPTICAL COMPANY, LTD. |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Optical pick-up apparatus with tracking error detection by detection of amount of light in fan field |
| 英文摘要 | An optical pick-up apparatus for reading and/or writing information from and/or on an optical record medium including a semiconductor laser, an objective lens projecting a laser beam onto the optical record medium, a hologram optical element having a first hologram for diffracting the laser beam onto a first pair of photodetectors to derive a focusing error and a second hologram for diffracting the laser beam onto a second pair of photodetectors to derive a tracking error. Each of the photodetectors of the second pair has light receiving regions which are divided along a division line substantially parallel with a diffracting direction of the second hologram which introduces astigmatism into the diffracted beams. A large tracking error signal can be detected stably on the basis of a distribution of an amount of light in a far field by the push-pull method. |
| 公开日期 | 1997-03-04 |
| 申请日期 | 1994-11-07 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/33484]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | OLYMPUS OPTICAL COMPANY, LTD. |
| 推荐引用方式 GB/T 7714 | YAMAZAKI, TAKESHI. Optical pick-up apparatus with tracking error detection by detection of amount of light in fan field. US5608695. 1997-03-04. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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