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1. 发明申请

US20080310284A1 DIFFRACTIVE OPTICAL ELEMENT AND OPTICAL PICKUP APPARATUS 审中-公开
标题翻译：衍射光学元件和光学拾取器
公开(公告)号：US20080310284A1
公开(公告)日：2008-12-18
申请号：US12179751
申请日：2008-07-25
申请人： Kyu TAKADA , Junji Hashimura , Yuichiro Ori , Toru Kimura
发明人： Kyu TAKADA , Junji Hashimura , Yuichiro Ori , Toru Kimura
IPC分类号： G11B7/00
CPC分类号： G11B7/1353 , G02B3/08 , G02B13/003 , G02B13/0045 , G02B13/0055 , G02B13/0065 , G11B7/1367 , G11B7/13922 , G11B7/13925 , G11B2007/0006
摘要： An optical pickup apparatus includes a diffractive optical element, and an objective lens that focuses a light beam of a first wavelength λ1, a light beam of a second wavelength λ2 and a light beam of a third wavelength λ3 on a first recording medium, a second recording medium, and a third recording medium, respectively, the wavelengths λ1, λ2, and λ3 being different from each other. The diffractive optical element includes a first diffractive surface that neither diffracts the light beam of the first wavelength λ1 nor the light beam of the third wavelength λ3 but diffracts the light beam of the second wavelength λ2, and a second diffractive surface that neither diffracts the light beam of the first wavelength λ1 nor the light beam of the second wavelength λ2 but diffracts the light beam of the third wavelength λ3, and each of the first and second diffractive surfaces satisfies the following condition inequality: Λ/λ≧8 wherein Λ represents the minimum pitch in the case that the width which generates a phase difference of one wavelength when the closest wavefronts resulting from adjacent steps in each of the diffractive surfaces are linked with each other is defined as one pitch, and λ represents the wavelength of the diffracted light.
摘要翻译：光拾取装置包括衍射光学元件和将第一波长λ1的光束，第二波长λ2的光束和第三波长λ3的光束的光束聚焦在第一记录介质上的物镜，第二记录介质和第三记录介质，波长λ1，λ2和λ3彼此不同。衍射光学元件包括：第一衍射面，其既不衍射第一波长λ1的光束也不衍射第三波长λ3的光束，但衍射第二波长λ2的光束;以及第二衍射面，其不衍射光第一波长λ1的光束和第二波长λ2的光束，但是衍射第三波长λ3的光束，并且第一和第二衍射面中的每一个满足以下条件不等式：<βin-line-formula description = “In-line Formulas”end =“lead”？>λ/λ> = 8 <？in-line-formula description =“In-line Formulas”end =“tail”？>其中Lambda表示该情况下的最小间距当由每个衍射表面中的相邻步骤产生的最接近的波前相互连接时产生一个波长的相位差的宽度被定义为一个间距，并且λ表示衍射光的波长。

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