Invention Grant
US07801008B2 Diffractive optical element, objective optical system including the same, and optical pickup including the same
有权
衍射光学元件，包括该衍射光学元件的物镜光学系统和包括该衍射光学元件的光学拾取器
- Patent Title: Diffractive optical element, objective optical system including the same, and optical pickup including the same
- Patent Title (中): 衍射光学元件，包括该衍射光学元件的物镜光学系统和包括该衍射光学元件的光学拾取器
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Application No.: US11797209Application Date: 2007-05-01
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Publication No.: US07801008B2Publication Date: 2010-09-21
- Inventor: Yasuhiro Tanaka , Michihiro Yamagata , Katsuhiko Hayashi
- Applicant: Yasuhiro Tanaka , Michihiro Yamagata , Katsuhiko Hayashi
- Applicant Address: JP Osaka
- Assignee: Panasonic Corporation
- Current Assignee: Panasonic Corporation
- Current Assignee Address: JP Osaka
- Agency: McDermott Will & Emery LLP
- Priority: JP2006-127367 20060501
- Main IPC: G11B7/00
- IPC: G11B7/00
Abstract:
A diffractive optical element includes a first optical part and a second optical part bonded to each other with a bonded surface therebetween configured as a diffraction surface. In this diffractive optical element, the diffraction order of diffracted light with the largest quantity of light out of diffracted light for one of a plurality of kinds of laser beams obtained on the diffraction surface is different from the diffraction order for at least another laser beam.
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