| Citation: | BI Shi-wen, ZHANG Xing-xiang, CHEN Li, LIU Jun-hao, FAN Shi-jie, FU Tian-jiao. Design of an ultra-compact wide-angle lens incorporating a curved image surface[J]. Chinese Optics. doi: 10.37188/CO.2025-0076
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To address the demand for large field-of-view and high compactness in lightweight AR glasses equipped with cameras, this study proposes an optical design method incorporating a curved image plane. First, based on Gaussian optics theory, the curved image plane imaging system is theoretically analyzed. The Petzval surface curvature characteristics of various optical configurations are derived, and the performance advantages of the curved image plane are highlighted through comparative simulations of dual systems. Then, a wide-angle and compact optical system is designed using a segmented multi-objective optimization strategy. Finally, image quality evaluation and tolerance analysis are performed on the designed system. The compact optical system comprises five aspheric plastic lenses and a rear-mounted filter. It features a focal length of 3.1 mm, a field of view (FOV) up to 80°, and a total system length of only 4.07 mm. The design results show that at 223 lp/mm, the modulation transfer function (MTF) exceeds 0.32 across all fields. The maximum RMS spot radius is 2.41 μm, with a distortion of only 2.5%, and the relative illumination remains above 45% across the entire field. This work lays a foundation for the application of curved sensors and offers a technical reference for the design of wide-angle compact lenses.
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