中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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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