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http://dx.doi.org/10.3807/KJOP.2020.31.6.281

Slim Mobile Lens Design Using a Hybrid Refractive/Diffractive Lens  

Park, Yong Chul (Department of Optical Engineering, Kongju National University)
Joo, Ji Yong (Department of Optical Engineering, Kongju National University)
Lee, Jun Ho (Department of Optical Engineering, Kongju National University)
Publication Information
Korean Journal of Optics and Photonics / v.31, no.6, 2020 , pp. 281-289 More about this Journal
Abstract
This paper reports a slim mobile lens design using a hybrid refractive/diffractive optical element. Conventionally a wide field of view (FOV) camera-lens design adopts a retrofocus type having a negative (-) lens at the forefront, so that it improves in imaging performance over the wide FOV, but with the sacrifice of longer total track length (TTL). However, we chose a telephoto type as a baseline design layout having a positive (+) lens at the forefront, to achieving slimness, based on the specification analysis of 23 reported optical designs. Following preliminary optimization of a baseline design and aberration analysis based on Zernike-polynomial decomposition, we applied a hybrid refractive/diffractive element to effectively reduce the residual chromatic spherical aberration. The optimized optical design consists of 6 optical elements, including one hybrid element. It results in a very slim telephoto ratio of 1.7, having an f-number of 2.0, FOV of 90°, effective focal length of 2.23 mm, and TTL of 3.7 mm. Compared to a comparable conventional lens design with no hybrid elements, the hybrid design improved the value of the modulation transfer function (MTF) at a spatial frequency of 180 cycles/mm from 63% to 71-73% at zero field (0 F), and about 2-3% at 0.5, 0.7, and 0.9 fields. It was also found that a design with a hybrid lens with only two diffraction zones at the stop achieved the same performance improvement.
Keywords
Hybrid lens; Diffractive optical element; Lens design; Mobile lens;
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