Infrared athermalization fisheye lens

The invention relates to an infrared athermalization fisheye lens, an optical system of the lens comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens which are sequentially arranged from an object side to an image side, and the first lens has negative focal power; the second lens has negative focal power; the third lens has negative focal power; the fourth lens has positive focal power; and the fifth lens has positive focal power. The optical athermalization device is compact in structure and reasonable in design, can meet the requirement for use in a large temperature range, and achieves the purpose of optical athermalization; and meanwhile, chalcogenide glass which can be processed by adopting a mould pressing process is selected, so that the production cost is reduced in mass production, customer expectation is better met, and relatively high performance is achieved. 本发明涉及一种红外无热化鱼眼镜头，所述镜头的光学系统包括从物侧至像侧依次设置的第一透镜、第二透镜、第三透镜、第四透镜以及第五透镜，所述第一透镜具有负光焦度；所述第二透镜具有负光焦度；所述第三透镜为负光焦度；所述第四透镜具