发明授权
- 专利标题： Objective lens, optical head and optical disk device
- 专利标题（中）： 物镜，光头和光盘装置
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申请号： US13578045申请日： 2011-03-17
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公开(公告)号： US08681593B2公开(公告)日： 2014-03-25
- 发明人: Fumitomo Yamasaki , Yoshiaki Komma , Katsuhiko Hayashi , Yoshifumi Takasu
- 申请人： Fumitomo Yamasaki , Yoshiaki Komma , Katsuhiko Hayashi , Yoshifumi Takasu
- 申请人地址： JP Osaka
- 专利权人： Panasonic Corporation
- 当前专利权人： Panasonic Corporation
- 当前专利权人地址： JP Osaka
- 代理机构： Wenderoth, Lind & Ponack, L.L.P.
- 优先权： JP2010-070707 20100325
- 国际申请： PCT/JP2011/001567 WO 20110317
- 国际公布： WO2011/118161 WO 20110929
- 主分类号： G11B7/135
- IPC分类号： G11B7/135
摘要：
A lens surface of an objective lens includes an optical surface formed of a plurality of annular optical surfaces which include an approximately stair-shaped cross section and which are annularly partitioned centered around an optical axis of the objective lens, and a plurality of connecting surfaces that connect the plurality of mutually adjacent annular optical surfaces to each other. The plurality of connecting surfaces include cylindrical connecting surfaces formed of a cylindrical surface centered around the optical axis and a conical connecting surface formed of a conical surface centered around the optical axis, and the conical connecting surface connects the annular optical surface and the annular optical surface.
公开/授权文献
- US20120320728A1 OBJECTIVE LENS, OPTICAL HEAD AND OPTICAL DISK DEVICE 公开/授权日：2012-12-20
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