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Proceedings Paper

Array projector design for projection on arbitrarily curved surfaces
Author(s): Stephanie Fischer; Peter Schreiber; Alf Riedel; Marcel Sieler
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Paper Abstract

The micro-optical array projector is a new and innovative possibility to project patterns onto arbitrary shaped surfaces1 . In contrast to single-aperture systems the illuminance of the projected image is raised by only increasing the lateral extent of the projector while keeping the length constant. Thanks to the setup - analogous to a fly’s eye condenser – we obtain a very compact design with homogenization of illumination. The images to be projected are presented as arbitrarily curved CAD-objects. Because of its complexity, the first attempt was a chief-ray backtrace implemented into a CAD-program, with the individual projectorlets modelled as pinhole cameras. With this principle one can trace the slides for several applications like the projection on perpendicular, as well as tilted and curved surfaces. Since aberrations cannot be considered with the simple CAD backtrace described above, we used the commercially available raytracer Zemax®, controlled by a macro, working in conjunction with a CADprogram for improved slide mask generation. Despite both methods, depending on the complexity of the optical system, are generating the fundamental mask data, the paper will show that there is a tradeoff between calculation time and accuracy. Based on this evaluation we will discuss further development as well as the possibility of improvement concerning the calculation methods. The different methods were investigated to determine their advantages and disadvantages. This provides the basis for the scope of application. Further we will demonstrate simulations as well as results obtained with built demonstrators.

Paper Details

Date Published: 23 September 2015
PDF: 9 pages
Proc. SPIE 9626, Optical Systems Design 2015: Optical Design and Engineering VI, 96260D (23 September 2015); doi: 10.1117/12.2191333
Show Author Affiliations
Stephanie Fischer, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Peter Schreiber, Fraunhofer-Institut für Angewandte Optik und Feinmechanik (Germany)
Alf Riedel, EDL Rethschulte GmbH (Germany)
Marcel Sieler, BMW Group (Germany)


Published in SPIE Proceedings Vol. 9626:
Optical Systems Design 2015: Optical Design and Engineering VI
Laurent Mazuray; Rolf Wartmann; Andrew P. Wood, Editor(s)

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