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25 September 2013 Design of compact fisheye lens with slope-constrained Q-type aspheres
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Abstract
Two types of fisheye lenses for automobile navigation are designed with slope-constrained Q-type aspheres. Special requirements have been considered in the design process, and Q-type surfaces are introduced by converted from other kinds of aspheric description with only coefficients of low-order terms retained. A possible problem of imaging the first surface onto the sensor has also been analyzed. As a result, as for the six-element fisheye lens, MTF is greater than 0.3 at 45lp/mm, f-θ distortion is less than 0.03 when the focal length is calibrated, field of view is 230° and full field relative illumination is greater than 0.4. For the four-element fisheye lens, MTF is greater than 0.4 at 45lp/mm, f-θ distortion is less than 0.16 , field of view is 190° and full field relative illumination is greater than 0.6. The design results show that the Q-type surfaces employed in fisheye lenses can make the system more compact, lightweighted and easier to manufacture.
© (2013) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chen Xu, Dewen Cheng, Weitao Song, Yongtian Wang, and Qingfeng Wang "Design of compact fisheye lens with slope-constrained Q-type aspheres", Proc. SPIE 8841, Current Developments in Lens Design and Optical Engineering XIV, 88410D (25 September 2013); https://doi.org/10.1117/12.2023501
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