Cylindrical lens arrays are another subject in which precision molding yields a broad application potential. Convex curved cylindrical lens arrays can be conventionally produced - that is, using grinding and polishing processes - only with great difficulty, since particularly the sharp intermediate zones cause problems. However, in precision molding it is possible to replicate these intermediate zones with extremely precision since the molding tool with its negative geometry can be given an extremely sharp edge. Over the course of the European research project "Production4µ", the precision molding process chain was further developed for the manufacture of aspherical cylindrical arrays. While shape accuracies of about 150 nm PV and roughnesses of < 10 nm Ra have been achieved in spherical arrays already, aspherical arrays represent an even greater challenge. Another task is the molding of two-sided arrays, since the high-precision alignment of top and bottom tools is essential. Since the centering accuracy is generally in the micrometer range, tools must remain positioned relative to one another in the same size range.
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