14 September 2011 Novel freeform optical surface design with spiral symmetry
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Abstract
Manufacturing technologies as injection molding or embossing specify their production limits for minimum radii of the vertices or draft angle for demolding, for instance. These restrictions may limit the system optical efficiency or affect the generation of undesired artifacts on the illumination pattern when dealing with optical design. A novel manufacturing concept is presented here, in which the optical surfaces are not obtained from the usual revolution symmetry with respect to a central axis (z axis), but they are calculated as free-form surfaces describing a spiral trajectory around z axis. The main advantage of this new concept lies in the manufacturing process: a molded piece can be easily separated from its mold just by applying a combination of rotational movement around axis z and linear movement along axis z, even for negative draft angles. The general designing procedure will be described in detail.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Pablo Zamora, Pablo Benítez, Juan C. Miñano, Juan Vilaplana, "Novel freeform optical surface design with spiral symmetry", Proc. SPIE 8129, Novel Optical Systems Design and Optimization XIV, 81290K (14 September 2011); doi: 10.1117/12.893707; https://doi.org/10.1117/12.893707
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