发明授权
- 专利标题： Objective lens, optical pickup apparatus and optical information recording and/or reproducing apparatus
- 专利标题（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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申请号： US12552189申请日： 2009-09-01
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公开(公告)号： US07957249B2公开(公告)日： 2011-06-07
- 发明人: Tohru Kimura , Eiji Nomura
- 申请人： Tohru Kimura , Eiji Nomura
- 申请人地址： JP Tokyo
- 专利权人： Konica Minolta Opto, Inc.
- 当前专利权人： Konica Minolta Opto, Inc.
- 当前专利权人地址： JP Tokyo
- 代理机构： Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
- 优先权： JP2005-034814 20050210
- 主分类号： G11B7/00
- IPC分类号： G11B7/00
摘要：
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.
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