| Issue |
J. Eur. Opt. Soc.-Rapid Publ.
Volume 11, 2016
|
|
|---|---|---|
| Article Number | 16001 | |
| Number of page(s) | 5 | |
| DOI | https://doi.org/10.2971/jeos.2016.16001 | |
| Published online | 06 February 2016 | |
Regular paper
Ultra-wide angle lens design with relative illumination analysis
1
Department of Optics and Photonics, National Central University, Chung-Li 32001, Taiwan
2
Department of Electrical Engineering, Feng Chia University, Taichung 40724, Taiwan
Received:
25
June
2015
Revised:
16
December
2015
An ultra-wide angle lens design with relative illumination analysis is presented. The half field angle of 80°, the relative illumination of the image plane will be reduced. It is necessary to increase the image numerical aperture ratio for X and Y direction, and decrease the angle between the chief ray and optical axis in the image space. However the ultra-wide angle lens induces great barrel distortion causing image extrusion. Therefore, we use F-theta distortion to replace optical distortion. Seven lenses and two pieces of flat glass are used for a sensor 1/6” sensor with 2.1 million pixels. The final result for the lens is a half viewing angle of 80°, F/2.4, a focal length 1.1 mm, a length of 22.37 mm, F-theta distortion of less than 2%, and relative illumination greater than 83%.
Key words: Lens design / relative illumination / numerical aperture / F-theta distortion / ultra-wide angle lens
© The Author(s) 2016. All rights reserved.
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