Invention Grant
- Patent Title: Optical element and optical pickup device
- Patent Title (中): 光学元件和光学拾取装置
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Application No.: US11999564Application Date: 2007-12-06
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Publication No.: US07986604B2Publication Date: 2011-07-26
- Inventor: Kazunari Tada , Youichi Ogawa , Nobuo Mushiake , Kazuyuki Nishi
- Applicant: Kazunari Tada , Youichi Ogawa , Nobuo Mushiake , Kazuyuki Nishi
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Opto, Inc.
- Current Assignee: Konica Minolta Opto, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Brinks Hofer Gilson & Lione
- Priority: JP2006-330267 20061207
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
An objective lens causes birefringence, which causes wave aberration in outgoing light from the objective lens. A coated objective lens has a dielectric multilayer film that can reduce astigmatism component of the wave aberration to 5 mλ rms or smaller when 10 mλ rms or larger astigmatism component of wave aberration is generated.
Public/Granted literature
- US20080259773A1 Optical element and optical pickup device Public/Granted day:2008-10-23
Information query
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