发明授权
US07463430B2 Diffraction element, objective lens unit, optical pickup, optical disc apparatus and design method for diffraction element
失效
衍射元件，物镜单元，光学拾取器，光盘装置和衍射元件的设计方法
- 专利标题： Diffraction element, objective lens unit, optical pickup, optical disc apparatus and design method for diffraction element
- 专利标题（中）： 衍射元件，物镜单元，光学拾取器，光盘装置和衍射元件的设计方法
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申请号： US11683093申请日： 2007-03-07
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公开(公告)号： US07463430B2公开(公告)日： 2008-12-09
- 发明人: Takatoshi Yamada , Satoshi Kawakita , Jin Sato , Kyu Kanno , Motoo Aiba
- 申请人： Takatoshi Yamada , Satoshi Kawakita , Jin Sato , Kyu Kanno , Motoo Aiba
- 申请人地址： JP Tokyo
- 专利权人： Sony Corporation
- 当前专利权人： Sony Corporation
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
- 优先权： JP2006-098707 20060331
- 主分类号： G02B13/18
- IPC分类号： G02B13/18 ; G02B5/18 ; G11B7/00
摘要：
The first and second materials of the diffraction element are selected such that the first material's refraction indexes n1(λ1), n1(λ2) and n1(λ3) for the first, second and third wavelengths λ1, λ2 and λ3 and the second material's refraction indexes n2(λ1), n2(λ2) and n2(λ3) for the first, second and third wavelengths λ1, λ2 and λ3 satisfy one of the conditions (1) or (2).