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US07529039B2 Object lens device with high numerical aperture and optical pickup device adopting the same 有权
具有高数值孔径的物镜透镜装置及其采用的光拾取装置

Object lens device with high numerical aperture and optical pickup device adopting the same
Abstract:
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
Abstract(Chinese):

布置在光行进路径上以将光聚焦在记录介质上的物镜包括作为光入射的入射表面的第一表面，光从其出射以聚焦在记录介质上的第二表面，以及衍射光学 元件设置在第一和第二表面中的至少一个上，并且具有fD / f <5的折射率，fD是衍射光学元件的焦距，f是物镜的焦距。 物镜的数值孔径为0.75以上。

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