Mr. Xin Cao Profile

Xin Cao

at Nanjing Univ of Science and Technology

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Proceedings Article | 1 April 2020 Presentation + Paper

Compact dual-view endoscope imaging system based on annularly stitched aspheres

Lu Chen, Qun Yuan, Ningyan Xu, Xin Cao, Zhishan Gao

Proceedings Volume 11353, 113531M (2020) https://doi.org/10.1117/12.2554885

KEYWORDS: Endoscopes, Aspheric lenses, Imaging systems, Panoramic photography

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We present a compact dual-view endoscope imaging system with a field of view (FOV) of ±80° and F/# of 3.4. The endoscope consists of two optical configurations for increasing FOV within the volume constraint. The front view configuration is a fisheye lens with a FOV of ±55°, and the side view configuration is a panoramic annular lens that covers the remaining FOV. The two configurations are combined by a hybrid lens that consists of center refractive portion and side catadioptric portion. Both the front and rear surfaces of the hybrid lens are aspherized with the use of annularly stitched Q-type aspheres. Thus, a compact endoscope is successfully implemented with fewer lenses, with a total length of 11.5 mm and a maximum diameter of 5.5 mm. The modulation transfer function at 167 lp/mm is above 0.4 over the entire FOV. The relative illumination is more than 0.65 and the optical distortion is within 10%. Moreover, the near telecentric condition is fulfilled and supports constant magnification focusing.

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