Invention Grant
- Patent Title: Optical information recording /reproducing device and objective lens for the same
- Patent Title (中): 光信息记录/再现装置和物镜相同
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Application No.: US11765498Application Date: 2007-06-20
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Publication No.: US07843792B2Publication Date: 2010-11-30
- Inventor: Daisuke Koreeda , Shuichi Takeuchi
- Applicant: Daisuke Koreeda , Shuichi Takeuchi
- Applicant Address: JP Tokyo
- Assignee: Hoya Corporation
- Current Assignee: Hoya Corporation
- Current Assignee Address: JP Tokyo
- Agency: Greenblum & Bernstein P.L.C.
- Priority: JP2006-170815 20060621
- Main IPC: G11B7/135
- IPC: G11B7/135

Abstract:
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
Public/Granted literature
- US20070297314A1 OPTICAL INFORMATION RECORDING /REPRODUCING DEVICE AND OBJECTIVE LENS FOR THE SAME Public/Granted day:2007-12-27
Information query
IPC分类: