27 October 2017 Miniaturized variable-focus objective employing a liquid-filled tunable aspherical lens
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We discuss the design, realization, and characterization of a miniaturized focus-tunable camera objective featuring a gravity-neutral, liquid-tunable aspherical lens and compare its performance to an equivalent system optimized for a conventional tunable lens. In addition to the innovative component, the objective design features three fixed elements and an aperture, which are all assembled to form a 5 × 5 × 13    mm system. With an image sensor size of 3 mm, the objective provides a viewing angle of 40 deg. By tuning the lens in its gravity-neutral range, the object distance can be shifted from 5 mm to infinity, with image-side cutoff frequency remaining above 84    lp / mm across the entire range. Through ray-tracing simulations and experimental results, we demonstrate that for optical trains of identical complexity, tunable aspherical lenses provide substantially better imaging quality over the object distance range of interest, compared to conventional, spherical tunable lenses.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Pengpeng Zhao, Pengpeng Zhao, Çaglar Ataman, Çaglar Ataman, Hans Zappe, Hans Zappe, } "Miniaturized variable-focus objective employing a liquid-filled tunable aspherical lens," Optical Engineering 56(10), 103110 (27 October 2017). https://doi.org/10.1117/1.OE.56.10.103110 . Submission: Received: 27 July 2017; Accepted: 2 October 2017
Received: 27 July 2017; Accepted: 2 October 2017; Published: 27 October 2017


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