Additive manufacturing (also called as 3D printing), a layer-by-layer printing of patterned material, is considered as novel option for low-cost and rapid manufacturing of optics. Recently, 3D printed ISO-standard ophthalmic lenses have been produced using Printoptical® technology (US Patent No. 13/924,974): a modified ink-jet printing technology that deposits micro-droplets Opticlear, which is a PMMA-like UV-curable polymer. In our work, the Printoptical® technology is further extended to freeform lenses using Opticlear, which is a PMMA like UV-curable polymer. The metrology of the freeform lenses is studied using white-light interferometry and VR-3000 series 3D surface profile macroscope.
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Bisrat G. Assefa, Toni Saastamoinen, Markku Pekkarinen, Joris Biskop, Markku Kuittinen, Jari Turunen, Jyrki Saarinen, "Design and characterization of 3D-printed freeform lenses for random illuminations," Proc. SPIE 10554, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII, 105541J (15 February 2018);