Invention Grant
- Patent Title: Objective lens, optical head, optical disk device, and information processing device
- Patent Title (中): 物镜，光头，光盘装置及信息处理装置
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Application No.: US13699134Application Date: 2011-05-31
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Publication No.: US08797834B2Publication Date: 2014-08-05
- Inventor: Fumitomo Yamasaki , Hiroshi Shiroiwa , Yoshiaki Komma , Junichi Asada , Osamu Kajino , Noriaki Terahara , Toshiyasu Tanaka
- Applicant: Fumitomo Yamasaki , Hiroshi Shiroiwa , Yoshiaki Komma , Junichi Asada , Osamu Kajino , Noriaki Terahara , Toshiyasu Tanaka
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: Wenderoth, Lind Ponack, L.L.P.
- Priority: JP2010-140092 20100621
- International Application: PCT/JP2011/003035 WO 20110531
- International Announcement: WO2011/161879 WO 20111229
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
A disclosed objective lens includes: a lens having an entrance surface and an emission surface; and an anti-reflection coat formed on the emission surface, wherein a transmittance T1—0 [%] of the anti-reflection coat when an incident angle of a first laser beam having a first wavelength λ1 (390 nm≦λ1≦430 nm) is 0°, and the transmittance T1—40 [%] of the anti-reflection coat when the incident angle of the first laser beam is 40° satisfy 0.95≦T1—0/T1—40≦1.05, and a transmittance T2—0 [%] of the anti-reflection coat when an incident angle of a second laser beam having a second wavelength λ2 (630 nm≦λ2≦680 nm) is 0° and a transmittance T2—40 [%] of the anti-reflection coat when the incident angle of the second laser beam is 40° satisfy 0.85≦T2—0/T2—40≦0.97.
Public/Granted literature
- US20130064057A1 OBJECTIVE LENS, OPTICAL HEAD, OPTICAL DISK DEVICE, AND INFORMATION PROCESSING DEVICE Public/Granted day:2013-03-14
Information query
IPC分类:
