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We present a method for the production of segmented optics. It is a novelprocessing developed at INAF-Osservatorio Astronomico di Brera (INAF-OAB)employing commercial of-the-shelf materials. It is based on the shaping of thinglass foils by means of forced bending, this occurring at room temperature(cold-shaping). The glass is then assembled into a sandwich structure forretaining the imposed shape. The principal mechanical features of the mirrorsare the very low weight, rigidity and environmental robustness. The cost andproduction time also turns to be very competitive. In this paper we sum up theresults achieved during the r&d performed in the past years. We haveinvestigated the theoretical limits of the structural components by means ofparametric finite elements analyses; we also discuss the effects caused by themost common structural loads. Finally, the process implementation, the moresignificant validation tests and the mass production at the industry isdescribed.

Cold-shaping of thin glass foils as novel method for mirrors processing. From the basic concepts to mass production of mirrors