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Proceedings Paper

Highly efficient photometrics tailoring by means of optimized bell-shaped lens arrays
Author(s): Michele Manca; Francesco Quercetti; Massimo Gattari; Roberto Cingolani; Giuseppe Gigli
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Paper Abstract

An innovative optical panel provided with an hexagonal array of refractive lenses having a properly optimized doublecurvature profile has been simulated by ray-tracing and fabricated by injection-moulding. Such lenses are constituted by a concave profile (having negative curvature radius) on their bottom and a convex profile (having positive curvature radius) on their top. We demonstrate that, if compared to refractive elements with conventional geometry, bell-shaped microlenses allow to collect incident rays within a wider angular range (so reducing the number of rays lost by TIR ) and to properly re-direct them. When installed on fluorescent tubes-based professional lighting systems, such refractive elements allow to reduce undesirable glare as prescribed by EN12464-1 Interior Lighting Design Standards and to finely control photometric outputs of luminaries. Besides, bell-shaped microlenses-based films were also simulated to be applied onto a bottom-emitting lambertian OLED. We demonstrate that, by properly tailoring both concave and convex profile shape, it is possible to increase the outcoupling efficiency, as well as the luminous flux emitted by the exit surface, by a factor up to 1.95 and, at the same time, to produce far-field photometric outputs characterized by uniform isocandela distribution maps with an aperture angle up to 60°.

Paper Details

Date Published: 23 September 2008
PDF: 10 pages
Proc. SPIE 7103, Illumination Optics, 71030E (23 September 2008); doi: 10.1117/12.802628
Show Author Affiliations
Michele Manca, Univ. di Formazione, Univ. del Salento (Italy)
Francesco Quercetti, iGuzzini Illuminazione spa (Italy)
Massimo Gattari, iGuzzini Illuminazione spa (Italy)
Roberto Cingolani, Univ. di Formazione, Univ. del Salento (Italy)
Giuseppe Gigli, Univ. di Formazione, Univ. del Salento (Italy)

Published in SPIE Proceedings Vol. 7103:
Illumination Optics
Tina E. Kidger; Stuart R. David, Editor(s)

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