Invention Grant
- Patent Title: Objective optical system, optical pickup apparatus and optical information recording/reproducing apparatus with diffraction structure and optical path difference-generating structure
- Patent Title (中): 物镜光学系统，光学拾取装置和具有衍射结构和光程差产生结构的光学信息记录/再现装置
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Application No.: US11063994Application Date: 2005-02-24
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Publication No.: US07715299B2Publication Date: 2010-05-11
- Inventor: Mitsuru Mimori
- Applicant: Mitsuru Mimori
- 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: JP2004-053925 20040227
- Main IPC: G11B7/135
- IPC: G11B7/135
Abstract:
The objective optical system of the present invention includes a first diffraction structure that applies diffraction to the light fluxes of wavelength λ1, wavelength λ2 and wavelength λ3 so that the diffracted lights of the L-th order (L: odd number), M-th order (M: integer) and N-th order (N: integer) each will have the maximum diffraction efficiency, and a first optical path difference-generating structure that substantially provides a phase difference to or two of the light fluxes of wavelength λ1, wavelength λ2 and wavelength λ3.
Public/Granted literature
Information query
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