发明授权
- 专利标题： Objective lens element and optical pickup device
- 专利标题（中）： 物镜和光学拾取装置
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申请号： US13248042申请日： 2011-09-29
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公开(公告)号： US08611199B2公开(公告)日： 2013-12-17
- 发明人: Katsuhiko Hayashi , Yoshiaki Komma , Yasuhiro Tanaka , Michihiro Yamagata
- 申请人： Katsuhiko Hayashi , Yoshiaki Komma , Yasuhiro Tanaka , Michihiro Yamagata
- 申请人地址： JP Kadoma-shi
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Kadoma-shi
- 代理机构： Judge Patent Associates
- 优先权： JP2010-219877 20100929; JP2011-164628 20110727
- 主分类号： G11B7/135
- IPC分类号： G11B7/135
摘要：
An optical pickup device is provided which is compatible with at least two types of optical disc standards having different NAs and which controls an effective NA when a light beam for an optical disc standard having a relatively small NA is converged, thereby forming a desired spot. An inner part 131B and an outer part 131F of an objective lens element 143 are provided with diffraction structures different from each other. A condition (1), DO11×DO12>0, and a condition (2), DO21×DO22
公开/授权文献
- US20120075982A1 Objective Lens Element and Optical Pickup Device 公开/授权日：2012-03-29