Spiral optical designs for nonimaging applications

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

doi:10.1117/12.896829

21 September 2011 Spiral optical designs for nonimaging applications

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

Proceedings Volume 8170, Illumination Optics II; 817005 (2011) https://doi.org/10.1117/12.896829
Event: SPIE Optical Systems Design, 2011, Marseille, France

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. In some demanding nonimaging applications, these restrictions may limit the system optical efficiency or affect the generation of undesired artifacts on the illumination pattern. 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. Some of these spiral symmetry examples will be shown here, as well as their simulated results.

Citation Download Citation

Pablo Zamora, Pablo Benítez, Juan C. Miñano, Juan Vilaplana, and Marina Buljan "Spiral optical designs for nonimaging applications", Proc. SPIE 8170, Illumination Optics II, 817005 (21 September 2011); https://doi.org/10.1117/12.896829

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