Novel freeform optical surface design with spiral symmetry

Pablo Zamora; Pablo Benítez; Juan C. Miñano; Juan Vilaplana

doi:10.1117/12.893707

14 September 2011 Novel freeform optical surface design with spiral symmetry

Pablo Zamora, Pablo Benítez, Juan C. Miñano, Juan Vilaplana

Proceedings Volume 8129, Novel Optical Systems Design and Optimization XIV; 81290K (2011) https://doi.org/10.1117/12.893707
Event: SPIE Optical Engineering + Applications, 2011, San Diego, California, United States

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.

Citation Download Citation

Pablo Zamora, Pablo Benítez, Juan C. Miñano, and Juan Vilaplana "Novel freeform optical surface design with spiral symmetry", Proc. SPIE 8129, Novel Optical Systems Design and Optimization XIV, 81290K (14 September 2011); https://doi.org/10.1117/12.893707

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