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

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

doi:10.1117/12.2554885

1 April 2020 Compact dual-view endoscope imaging system based on annularly stitched aspheres

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

Proceedings Volume 11353, Optics, Photonics and Digital Technologies for Imaging Applications VI; 113531M (2020) https://doi.org/10.1117/12.2554885
Event: SPIE Photonics Europe, 2020, Online Only

Abstract

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.

Conference Presentation

Citation Download Citation

Lu Chen, Qun Yuan, Ningyan Xu, Xin Cao, and Zhishan Gao "Compact dual-view endoscope imaging system based on annularly stitched aspheres", Proc. SPIE 11353, Optics, Photonics and Digital Technologies for Imaging Applications VI, 113531M (1 April 2020); https://doi.org/10.1117/12.2554885

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