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Proceedings Paper

Design of compact fisheye lens with slope-constrained Q-type aspheres
Author(s): Chen Xu; Dewen Cheng; Weitao Song; Yongtian Wang; Qingfeng Wang
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Paper 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.

Paper Details

Date Published: 25 September 2013
PDF: 11 pages
Proc. SPIE 8841, Current Developments in Lens Design and Optical Engineering XIV, 88410D (25 September 2013); doi: 10.1117/12.2023501
Show Author Affiliations
Chen Xu, Beijing Institute of Technology (China)
Dewen Cheng, Beijing Institute of Technology (China)
Weitao Song, Beijing Institute of Technology (China)
Yongtian Wang, Beijing Institute of Technology (China)
Qingfeng Wang, Beijing Institute of Technology (China)


Published in SPIE Proceedings Vol. 8841:
Current Developments in Lens Design and Optical Engineering XIV
R. Barry Johnson; Virendra N. Mahajan; Simon Thibault, Editor(s)

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