发明授权
- 专利标题: Optical information recording /reproducing device and objective lens for the same
- 专利标题(中): 光信息记录/再现装置和物镜相同
-
申请号: US11765498申请日: 2007-06-20
-
公开(公告)号: US07843792B2公开(公告)日: 2010-11-30
- 发明人: Daisuke Koreeda , Shuichi Takeuchi
- 申请人: Daisuke Koreeda , Shuichi Takeuchi
- 申请人地址: JP Tokyo
- 专利权人: Hoya Corporation
- 当前专利权人: Hoya Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Greenblum & Bernstein P.L.C.
- 优先权: JP2006-170815 20060621
- 主分类号: G11B7/135
- IPC分类号: G11B7/135
摘要:
There is provided an objective lens including a first optical member and a second optical member which are made of materials different from each other and are cemented together at a cementing surface. The cementing surface includes a first phase shift structure having a plurality of refractive surface zones concentrically formed about an optical axis of the objective lens. The first phase shift structure satisfies conditions (1) and (2): 0.85
公开/授权文献
信息查询
IPC分类: