发明授权
- 专利标题: Objective lens and optical pickup apparatus
- 专利标题(中): 物镜和光学拾取装置
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申请号: US11097159申请日: 2005-04-04
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公开(公告)号: US07161744B2公开(公告)日: 2007-01-09
- 发明人: Tatsuo Ohta , Takashi Nozaki
- 申请人: Tatsuo Ohta , Takashi Nozaki
- 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: JP2004-113166 20040407
- 主分类号: G02B13/24
- IPC分类号: G02B13/24 ; G02B1/10 ; G02B13/14
摘要:
An objective lens for converging a monochromatic light flux having a specific wavelength in a range of 350 to 450 nm on an optical information recording medium while the objective lens is placed facing the optical information recording medium, the objective lens comprising: a lens body containing a polymer resin having an alicyclic structure; a first film having a refractive index of less than 1.7 for light having a wavelength of 405 nm; a second film having a refractive index of 1.7 or more for the light having the wavelength of 405 nm; and a third film having a refractive index of 1.55 or less for the light having the wavelength of 405 nm, wherein: the first film, the second film and the third film are provided on the lens body; the first film is provided between the lens body and the second film; the second film is provided between the first film and the third film; and a thickness of the first film is in a range of 50 to 15000 nm.
公开/授权文献
- US20050225879A1 Objective lens and optical pickup apparatus 公开/授权日:2005-10-13