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Proceedings Paper

Design and characterization of 3D-printed freeform lenses for random illuminations
Author(s): Bisrat G. Assefa; Toni Saastamoinen; Markku Pekkarinen; Joris Biskop; Markku Kuittinen; Jari Turunen; Jyrki Saarinen
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Paper Abstract

A combination of light-emitting diodes (LEDs) with freeform optics has been recently investigated widely for energy efficient illumination due to its high optical performance and compact size. The freeform optics design methods are application specific. The transformation of the light source into the target irradiance distribution using freeform optics usually leads to solving an inverse problem, which can be formulated by using a point light source, geometrical optics, monotonic ray bending and lossless system. Here, a customized algorithm is proposed to design freeform lenses for both LED source based simple uniform rectangular illumination and collimated light source based complex image target irradiance distributions by numerically solving the elliptic Monge-Ampère equation. The optical performance of the lenses is examined theoretically by using commercial ray tracing software.

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.

Paper Details

Date Published: 15 February 2018
PDF: 8 pages
Proc. SPIE 10554, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII, 105541J (15 February 2018); doi: 10.1117/12.2288223
Show Author Affiliations
Bisrat G. Assefa, Univ. of Eastern Finland (Finland)
Toni Saastamoinen, Univ. of Eastern Finland (Finland)
Markku Pekkarinen, Univ. of Eastern Finland (Finland)
Joris Biskop, Luxexcel (Belgium)
Markku Kuittinen, Univ. of Eastern Finland (Finland)
Jari Turunen, Univ. of Eastern Finland (Finland)
Jyrki Saarinen, Univ. of Eastern Finland (Finland)

Published in SPIE Proceedings Vol. 10554:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII
Jong Kyu Kim; Michael R. Krames; Martin Strassburg; Li-Wei Tu, Editor(s)

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