Coelux S.r.l.

Antonio Lotti

Paolo Di Trapani

Davide Magatti

Matteo Molteni

Michael Ragan Krames

Paolo Ragazzi

Giorgio Gatti

Peter Schreiber

Bernd Höfer

Wilfried Pohl

Manfred Gstrein

Andreas Danler

Davide Farina

Wilfried Kurz

Chen Li

The present disclosure is directed to a direct-light generator for sun-sky-imitating illumination devices configured for generating natural light similar to that from the sun and the sky The generator includes a first emitting surface and an array of light-emitting devices configured to generate from a primary light a direct light which exits the first emitting surface along a direct-light direction. The direct light exiting the first emitting surface has a luminance profile which has a narrow peak in the angular distribution around the direct-light direction and is uniform across the first emitting surface. Each light-emitting device includes a light emitter having an emitting surface and at least a pair of collimation lenses illuminated by the light emitter.

Direct-light generator for sun-sky-imitating illumination devices

A lighting device includes: a first optical unit and a second optical unit. The first optical unit includes a primary light source and dichroic separation optics. The primary light source is configured to emit primary light in the visible spectrum. The dichroic separation optics are configured to intercept at least part of the primary light generated by the primary light source and emit, from a first emission surface, at least one first highly collimated light component and at least one diffuse light component. The at least one first highly collimated light component and the at least one diffuse light component forms a light with chromatic components having different angular distributions. The second optical unit includes secondary collimation optics is configured to generate, from the light with chromatic component, a weakly collimated light component and a second highly collimated light component.

Lighting device to simulate natural light

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

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 ().

Lighting system with appearance affecting optical system

A light source () for emitting collimated light () in particular for a large area luminaire () comprises a light guide unit () comprising a plurality of light guide strips () configured for guiding light received at the at least one lateral coupling face (), for example, by total internal reflection. The light guide strips comprise a plurality of localized light source regions () at a main front face (A) for having light pass there through, wherein the light source regions () are provided along the light guide strip () within a non-source region (). The light source () further comprising a plurality of light emitting units () for emitting light into the light guide strips () through respective portions of the at least one coupling face (), and a collimation unit () extending along the main front face (A) and comprising a plurality of collimating elements. Each collimating element comprises an input side and an output side, is optically associated to one of the plurality of light source regions (), and is configured to receive light emerging from the associated light source region () at its input side and to emit collimated light () from a respective collimated light emitting region () formed at its output side.

Large area light source and large area luminaire

A lighting system (A,B) comprises a light source () for emitting a light beam stripe (B) with a plurality of light emitting units (A,B) forming an array in the longitudinal direction (X), and an optical element () at the exit side of the light source () extending across the plurality of light emitting units, and configured to enlarge the beam divergence in the transversal direction. The lighting system (A,B) further comprises a reflector unit, a support structure (), and a reflective surface () with an essentially linear shape in the longitudinal direction (X) and a curved shape in the longitudinal transverse direction (Y), and a chromatic diffusing layer () comprising a plurality of nanoparticles embedded in a matrix, wherein the chromatic diffusing layer () is positioned such that at least a portion of the reflected light beam (A) passes through the chromatic diffusing layer (), thereby generating diffuse light by scattering more efficiently the short-wavelengths components of the light in the visible spectral range than the long-wavelength components of the light in the visible spectral range.

Modular sun-sky-imitating lighting system

A chromatic diffusing layer () comprises a plurality of nanoparticles () embedded in a matrix (), for Rayleigh-like scattering with an average size d in the range 10 nm&#x2264;d&#x2264;240 nm, and a ratio between the blue and red scattering optical densities Log [R(450 nm)]/Log [R(630 nm)] of said chromatic reflective unit falls in the range 5&#x2265;&#x3b3;&#x2265;2.5, where R(&#x3bb;) is the monochromatic normalized specular reflectance of the chromatic reflective unit, which is the ratio between the specular reflectance of the chromatic reflective unit and the specular reflectance of a reference sample identical to the chromatic reflective unit except for the fact that the chromatic diffusing layer does not contain nanoparticles with the size d in the range 10 nm&#x2264;d&#x2264;240 nm and for the direction normal to the reflective layer () of the chromatic reflective unit (), the monochromatic normalized specular reflectance R(&#x3bb;) of the chromatic reflective unit at a wavelength of 450 nm is in the range from about 0.0025 to about 0.15, such as defined by the equations 0.0025&#x2264;R(450 nm)&#x2264;0.15, 0.0025&#x2264;R(450 nm)&#x2264;0.05, 0.0025&#x2264;R(450 nm)&#x2264;0.04.

Chromatic reflective unit

A lighting system comprises a chromatic reflective unit (), and a light source (), wherein the chromatic reflective unit () is shaped as a rotational paraboloid or a portion of a rotational paraboloid, and the light source () is positioned close to or at the paraboloid focal position.

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Arcisate Varese, Italy

Antonio Lotti