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发明授权
CN101369047B 光学镜头 有权

光学镜头
摘要：
一种用于激光加工使用的光学fθ镜头，包括透镜组和光阑，所述光阑位于透镜组的前方，透镜组包括三个透镜，该三个透镜分别为第一、第二、第三透镜，依次排列为“负-正-正”分离的光焦度系统，其中，所述第一透镜为弯月型负透镜，第二透镜为弯月型正透镜，第三透镜为平凸型或弯月型正透镜，第一透镜、第二透镜及第三透镜所有的曲面均向着光阑方向弯曲，且整个光学系统的焦距为f，第一、第二、第三透镜的焦距分别为f1、f2、f3，各透镜的焦距与整个光学系统的焦距f比率满足以下要求关系：-0.6＜f1/f＜-0.4；0.5＜f2/f＜0.8；0.9＜f3/f＜1.2。本发明所提供的光学fθ镜头，使得系统的的球差、彗差与场曲都达到较好的平衡，使得成像结果良好且在整个像面上成像均匀，且该结构应用于大口径入射的fθ镜头的小型化取得较好的效果。
摘要（英）：

Disclosed is an optics f Theta lens for laser processing usage, which comprises a lens group and an aperture. The aperture is positioned in front of the lens group, and the lens group comprises three lenses which respectively are a first lens, a second lens and a third lens, and are sequentially arrayed according to a negative-positive-positive separated focal power system, the first lens is a falcate negative lens, the second lens is a falcate positive lens, the third lens is a biconvex positive lens or falcate positive lens, all curved surfaces of the first lens, the second lens and the third lens are bent towards the aperture, the focus of the whole optics system is f, the focuses of the first lens, the second lens and the third lens respectively are f1, f2, f3, and the focus of each lens and the focus f of the system can meet the following requirements: -0.6

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