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    • 3. 发明授权
    • LWIR imaging lens, image capturing system having the same, and associated method
    • LWIR成像透镜,具有相同的图像捕获系统及相关方法
    • US09348120B2
    • 2016-05-24
    • US13356211
    • 2012-01-23
    • Jeremy Huddleston
    • Jeremy Huddleston
    • G02B13/14
    • G02B13/008G02B7/04G02B13/003G02B13/14H04N5/33
    • An imaging lens for use with an operational waveband over any subset of 7.5-13.5 μm may include a first optical element of a first high-index material and a second optical element of a second high-index material. At least two surfaces of the first and second optical elements may be optically powered surfaces. A largest clear aperture of all optically powered surfaces may not exceed a diameter of an image circle of the imaging lens corresponding to a field of view of 55 degrees or greater by more than 30%. The first and second high-index materials may have a refractive index greater than 2.2 in the operational waveband, an absorption per mm of less than 75% in the operational waveband, and an absorption per mm of greater than 75% in a visible waveband of 400-650 nm.
    • 用于7.5-13.5μm的任何子集上的操作波段的成像透镜可以包括第一高折射率材料的第一光学元件和第二高折射率材料的第二光学元件。 第一和第二光学元件的至少两个表面可以是光学动力表面。 所有光学动力表面的最大透明孔径可以不超过对应于55度或更大视场大于30%的成像透镜的图像圆的直径。 第一和第二高折射率材料在工作波段中的折射率可能大于2.2,每毫米的吸收值在工作波段的小于75%,每毫米的可见波段的吸收率大于75% 400-650nm。