发明名称 |
Object lens device with high numerical aperture and optical pickup device adopting the same |
摘要 |
An object lens arranged on a light proceeding path to focus light on a recording medium includes a first surface that is an incident surface on which light is incident, a second surface from which light exits to be focused on the recording medium, and a diffractive optical element disposed on at least one of the first and second surfaces and which has a refractivity of fD/f<5, fD being a focus distance of the diffractive optical element and f being a focal distance of the object lens. The object lens has a numerical aperture of 0.75 or greater.
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申请公布号 |
US7529039(B2) |
申请公布日期 |
2009.05.05 |
申请号 |
US20070748753 |
申请日期 |
2007.05.15 |
申请人 |
SAMSUNG ELECTRONICS CO., LTD. |
发明人 |
YOO JANG-HOON;SHIN DONG-HO;PARK SOO-HAN |
分类号 |
G02B13/18;G02B3/02;G02B3/08;G11B7/00;G11B7/135 |
主分类号 |
G02B13/18 |
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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