Coelux S.r.l.

Matteo Molteni

Davide Magatti

Paolo Di Trapani

Antonio Lotti

Michael Ragan Krames

Paolo Ragazzi

Simone Bonanomi

Sandro Usseglio Nanot

Giorgio Gatti

A direct-light generator includes an optical unit positioned downstream of an output surface of a collimated light source and upstream from a first emitting surface with respect to a direct light direction. The optical unit includes a first planar light mixing element characterized by a first response function having a first angular profile with a peak having a first divergence angle, and a second planar light mixing element characterized by a second response function having a second angular profile with a peak having a second divergence angle. The first planar light mixing element at least partially intercepts collimated light exiting the output surface of the collimated light source and defines a unit input surface. The second planar light mixing element is positioned downstream of the unit input surface to at least partially intercept light crossing the unit input surface and to define a unit emitting surface.

Sun-sky-imitating illumination device

The present disclosure is directed to an illumination device for providing a divergent illumination. The illumination device comprises a light source for emitting light in a visible spectrum; an output aperture, through which the light emitted from the light source exits the illumination device; and a layer structure. The layer structure comprises a scattering layer of a plurality of nanoscale scattering elements embedded in a host material and is positioned in an optical path of the emitted light that extends between the light source and the output aperture. The layer structure comprises further a pair of areal electrical contact layers, wherein the areal electrical contact layers extend at opposite sides of the scattering layer and are electrically connectable with a power source to generate an electric field across the scattering layer. The divergent illumination provided by the illumination device is characterized by at least one luminous intensity distribution curve having the full width at half maximum of at least 10&#xb0;.

Tunable white illumination

A sunlight-based projector system () is disclosed for providing a direct light beam (). The projector system () comprises a sunlight receiving unit () with a collector system (), a plurality of optical fibers (), and a plurality of fiber output channels (). The collector system () collects natural outdoor light, and couples the collected light into the plurality of optical fibers (). The projector system () comprises further a sunlight forming unit () with a plurality of optical collimator units () arranged in a two-dimensional array, wherein each optical collimator unit () receives the respective fiber output light () and comprises at least one optical collimator () for reducing the angular distribution width of the received divergent fiber output light (). Output areas of the plurality of optical collimator units () form essentially a continuously extending large light-emitting face () of the sunlight forming unit () for emitting an essentially collimated light beam (). The generated direct light beam () may be used together with diffused light generating areal units to provide a sun-sky imitating lighting system with a sun-like appearance.

Sunlight-based sun imitating illumination

A light source () for emitting collimated light () in particular for a large area luminaire () comprises a light guide unit () for guiding light by total internal reflection. The light guide unit comprises a plurality of localized light source regions () at a main front face (A) for having light pass there through. The light source () further comprises a plurality of light emitting units () for emitting light into the light guide strips () through respective portions of the at least one coupling face () of the light guide unit (), and a collimation unit () extending along the main front face (A) and comprising a plurality of collimating elements. At least one light emitting unit () is configured as a light input coupling assembly () to receive collected natural light from a fiber () and to provide the received natural light to the light guide unit (). The light source () can be implemented in a sunlight-based illumination system () collecting and providing natural light to the light source ().

Sunlight-based large area light source and large area luminaire

In an aspect, a lighting system () comprises a lighting unit () with a light source () and a dichroic light exiting surface (), wherein the lighting unit () is configured for emitting dichroic light from the dichroic light exiting surface (). The emitted dichroic light includes a directional light portion () of direct light () and a diffused light portion () of diffused light () with a another larger correlated color temperature. The lighting system further comprises an appearance affecting optical system () with a plurality of structural elements () that comprise surfaces that delimit a plurality of diffused light passages (), and comprise direct light illuminated surface regions (), which are subject to the illumination with direct light () from respectively associated affected direct light providing areas () of the dichroic light exiting surface (). Moreover, the affected direct light providing areas () cover at least 70% of the dichroic light exiting surface (), and the direct light () from at least one affected direct light providing area () and diffused light () propagate within at least one of the diffused light passages ().

Growing community of inventors

Cassina Rizzardi, Italy

Matteo Molteni