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发明授权
CN102606977B 用于LED汽车远光灯的自由曲面光学透镜 失效 - 权利终止

用于LED汽车远光灯的自由曲面光学透镜
摘要：
本发明公开了一种用于LED汽车远光灯的自由曲面光学透镜，由透明材料制成，透明材料为PC或PMMA或光学玻璃，透镜包括入射面及出射面。所述透镜的底面中心设有一供LED安装于其内的空腔，空腔的一部分腔壁是柱面，所述的入射面由所述柱面和位于柱面顶部的自由曲面构成；透镜的外侧面是自由曲面，透镜的顶面是平面即所述的出射面。由于LED光源发光效率高及采用自由曲面透镜，从光源射出的光线几乎可以全部被收集利用，故能量利用率很高，同时，LED光源光型，发光方向都可以控制。透镜的底面中部设有一供LED安装于其内的空腔，使LED光源易于安装，透镜的体积小，留出大量的空间有利于散热装置的安装。点亮LED光源，光线经过透镜后出射，可以得到椭圆形光型和满足国家标准GB25991-2010的照度分布。
摘要（英）：

An optical lens with free-form surfaces for an LED automobile headlight on high beam comprises an incident surface and an emergent surface (501). A cavity is disposed in the center of the bottom of the lens for an LED to be mounted therein, and a part of the wall of the cavity is a cylindrical surface (404). The incident surface is formed by the cylindrical surface (404) and a free-form surface (403, 102) located on the top of the cylindrical surface (404), an outer side surface (405, 101) of the lens is the other free-form surface, and the top of the lens is a plane, that is, the emergent surface (501). An LED light source is turned on, light rays are emergent via the lens, an elliptical light form can be obtained, and the requirement of the illuminance distribution of National Standard of the People's Republic of China GB25991-2010 is satisfied.

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