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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