Invention Grant
- Patent Title: Objective lens, optical pickup apparatus and optical information recording and/or reproducing apparatus
- Patent Title (中): 物镜，光学拾取装置和光学信息记录和/或再现装置
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Application No.: US12552189Application Date: 2009-09-01
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Publication No.: US07957249B2Publication Date: 2011-06-07
- Inventor: Tohru Kimura , Eiji Nomura
- Applicant: Tohru Kimura , Eiji Nomura
- Applicant Address: JP Tokyo
- Assignee: Konica Minolta Opto, Inc.
- Current Assignee: Konica Minolta Opto, Inc.
- Current Assignee Address: JP Tokyo
- Agency: Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
- Priority: JP2005-034814 20050210
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
An objective lens according to the present invention is an objective lens used for an optical pickup apparatus, and the objective lens includes a superimposed structure on a surface of a lens with a power in which a first optical path difference providing structure changing spherical aberration in under-corrected direction when a wavelength of an incident light flux becomes longer, and a second optical path difference providing structure changing spherical aberration in over-corrected direction when a wavelength of an incident light flux becomes longer are superimposed.
Public/Granted literature
- US20090316563A1 OBJECTIVE LENS, OPTICAL PICKUP APPARATUS AND OPTICAL INFORMATION RECORDING AND/OR REPRODUCING APPARATUS Public/Granted day:2009-12-24
Information query
IPC分类:
