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12 September 2021 Simulation and design of a Fresnelized freeform optic for a head-up display
Jacqueline Dahlmanns, Annika Völl, Rolf Wester, Jochen Stollenwerk, Peter Loosen, Carlo Holly
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Proceedings Volume 11874, Illumination Optics VI; 118740Q (2021) https://doi.org/10.1117/12.2600221
Event: SPIE Optical Systems Design, 2021, Online Only
Abstract
Freeform optics are used to create complex application-adapted illuminance distributions due to their high number of adjustable degrees of freedom. As with conventional optics, this can result for some applications in large optics that exceed the available installation space or lead to high production costs. While the use of Fresnel lenses is common in such cases for conventional optics, the Fresnelization step in the design process of freeform optics is more complex due to the lack of rotational symmetry and only done for specific cases. Therefore, this paper presents a method to examine different segmentation strategies on freeform lenses and to optimize Fresnelization parameters. In this work, the method will be demonstrated using a head-up display (HUD) as example, in which the combination of a Fresnel lens and a display creates a moiré pattern in the illuminance distribution. In order to accelerate the simulation of complex Fresnel freeform optics considerably, a special ray tracing algorithm is developed, which takes advantage of the segmentation characteristics. The simulation approach of the illuminance distribution and the optimization of the Fresnelization are shown and discussed on a lens with about 300 segments visibly reducing the moiré pattern.
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Jacqueline Dahlmanns, Annika Völl, Rolf Wester, Jochen Stollenwerk, Peter Loosen, and Carlo Holly "Simulation and design of a Fresnelized freeform optic for a head-up display", Proc. SPIE 11874, Illumination Optics VI, 118740Q (12 September 2021); https://doi.org/10.1117/12.2600221
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KEYWORDS
Freeform optics
Ray tracing
Fresnel lenses
Heads up displays
Computer simulations
Optimization (mathematics)
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