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首页> 外文会议>Conference on Novel Optical Systems, Methods, and Applications >Maksutov-Cassegrain inspired high object-space resolution lens for smartphone iris imaging
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Maksutov-Cassegrain inspired high object-space resolution lens for smartphone iris imaging

机译：Maksutov-Cassegrain启发了智能手机IRIS成像的高对象分辨率镜头

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摘要

We present a compact catadioptric lens for use in smartphone iris imaging. With an emphasis on object-spaceresolution, this lens has a large aperture. To fit within typical shallow phone casing, the lens is folded axially,with the folding arrangement inspired by the Maksutov telescope; the resulting z-height is less than 5.5 mm. Twomirrors give a double ray path, with the secondary mirror centrally obscuring the lens aperture. Using a singlerefracting element, axial chromatic aberration is limited by using low-dispersion glass. Aspheric coe cients areused on all surfaces, for aberration compensation. The refocussing lens is designed to focus on a nearest objectat -300 mm, with refocus achieved by a small axial shift of the primary mirror. The polychromatic MTF isabove 0.4 across a 16-degree full field-of-view (FoV) for iris distances as large as -500 mm, for the near-infraredwavelengths of 920±35 nm. While the FoV is limited by the catadioptric arrangement, it is su ciently large forthis specialized application. This can be justified by considering that the human interpupillary distance is suchthat the two eyes subtend a full FoV of 8-deg or less at the closest distance of -300 mm.
机译：我们提出了一种用于智能手机IRIS成像的紧凑型抗镜片镜片。强调对象空间分辨率，该镜头具有大的孔径。为了适合典型的浅电话套管，镜头轴向折叠，折叠安排受到Maksutov望远镜的启发;得到的Z高度小于5.5mm。二镜子给出双射线路径，二次镜子集中遮挡镜头孔。使用单身折射元件，轴向色差通过使用低分散玻璃受限。非球面COE凯斯是用于所有表面，用于差距补偿。重新驾驶镜头旨在专注于最近的物体在-300 mm，通过重截面通过初级镜的小轴向偏移来实现。多色MTF是对于近红外线的虹膜距离（FOV）为高于0.4以上的16度全视野（FOV），对于近红外线波长为920±35nm。虽然FOV受到抗射频布置的限制，但它很大程度上很大这个专门的申请。考虑到人的夹层距离是这样的，这可以是合理的这两只眼睛在最近-300mm的最近距离处于8°或更少的全部FOV。

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