TY - GEN
T1 - Design of compact fisheye lens with slope-constrained Q-type aspheres
AU - Xu, Chen
AU - Cheng, Dewen
AU - Song, Weitao
AU - Wang, Yongtian
AU - Wang, Qingfeng
PY - 2013
Y1 - 2013
N2 - 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.
AB - 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.
KW - Distortion evaluation
KW - Fisheye lens
KW - Image quality analysis
KW - Q-type asphere
KW - Tolerance analysis
UR - http://www.scopus.com/inward/record.url?scp=84888169036&partnerID=8YFLogxK
U2 - 10.1117/12.2023501
DO - 10.1117/12.2023501
M3 - Conference contribution
AN - SCOPUS:84888169036
SN - 9780819496911
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Current Developments in Lens Design and Optical Engineering XIV
T2 - Conference on Current Developments in Lens Design and Optical Engineering
Y2 - 25 August 2013 through 27 August 2013
ER -