发明名称 |
Objective lens and optical pickup apparatus |
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.
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申请公布号 |
US2005225879(A1) |
申请公布日期 |
2005.10.13 |
申请号 |
US20050097159 |
申请日期 |
2005.04.04 |
申请人 |
KONICA MINOLTA OPTO, INC. |
发明人 |
OHTA TATSUO;NOZAKI TAKASHI |
分类号 |
G02B13/00;G02B1/04;G02B1/10;G02B1/11;G02B3/00;G02B13/18;G11B7/00;G11B7/135;(IPC1-7):G02B3/00 |
主分类号 |
G02B13/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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