Abstract:
A light source (25) for emitting collimated light (29) in particular for a large area luminaire (21) comprises a light guide unit (43) for guiding light by total internal reflection. The light guide unit comprises a plurality of localized light source regions (57) at a main front face (55A) for having light pass there through. The light source (25) further comprises a plurality of light emitting units (41) for emitting light into the light guide strips (91) through respective portions of the at least one coupling face (47) of the light guide unit (43), and a collimation unit (45) extending along the main front face (55A) and comprising a plurality of collimating elements. At least one light emitting unit (41) is configured as a light input coupling assembly (250) to receive collected natural light from a fiber (249) and to provide the received natural light to the light guide unit (43). The light source (25) can be implemented in a sunlight-based illumination system (241) collecting and providing natural light to the light source (25).
Abstract:
A seat illuminating system (101D) for, in particular sunlight-like, illuminating a target region (144) comprises a seat arrangement (140) having a seat surface (142A). The target region (144) is defined for a person sitting on the seat surface (142 A). The seat illuminating system (101D) comprises further a mounting structure (150 A) being spatially fixed with respect to the seat arrangement (140); a reflector unit (106) mounted at the mounting structure (150 A) and comprising a reflective surface and a luminous layer for homogenously emitting diffuse light at a first color, the luminous layer extending in front of the reflective surface and comprising a visible front area section (110A) of the reflector unit (106). The seat illuminating system (101D) comprises further a light projector (102) mounted at the mounting structure (150A) and configured to generate a light beam (103) adapted in size for comprehensively illuminating the visible front area section (110A) such that at least a portion of the light beam (103) passes through the luminous layer before and after being reflected by the reflective surface, thereby forming an illuminating light beam (103 A) at a second color directed onto the target region (144).
Abstract:
A sunlight-based projector system (3) is disclosed for providing a direct light beam (5). The projector system (3) comprises a sunlight receiving unit (9) with a collector system (13), a plurality of optical fibers (15), and a plurality of fiber output channels (44). The collector system (13) collects natural outdoor light, and couples the collected light into the plurality of optical fibers (15). The projector system (3) comprises further a sunlight forming unit (11) with a plurality of optical collimator units (47) arranged in a two-dimensional array, wherein each optical collimator unit (47) receives the respective fiber output light (45) and comprises at least one optical collimator (49) for reducing the angular distribution width of the received divergent fiber output light (45). Output areas of the plurality of optical collimator units (47) form essentially a continuously extending large light- emitting face (53) of the sunlight forming unit (11) for emitting an essentially collimated light beam (5). The generated direct light beam (5) may be used together with diffused light generating areal units to provide a sun-sky imitating lighting system with a sun-like appearance.
Abstract:
A lighting system (100A, 100B) comprises a light source (102) for emitting a light beam stripe (220B) with a plurality of light emitting units (603, 803 A, 803B) forming an array in the longitudinal direction (X), and an optical element (870) at the exit side of the light source (102) extending across the plurality of light emitting units, and configured to enlarge the beam divergence in the transversal direction. The lighting system (100A, 100B) further comprises a reflector unit, a support structure (210), and a reflective surface (104) 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 (108) comprising a plurality of nanoparticles embedded in a matrix, wherein the chromatic diffusing layer (108) is positioned such that at least a portion of the reflected light beam (220A) passes through the chromatic diffusing layer (108), 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.
Abstract:
A light source (25) for emitting collimated light (29) in particular for a large area luminaire (21) comprises a light guide unit (43) optionally comprising a plurality of light guide strips (91) configured for guiding light received at the at least one lateral coupling face (47), for example, by total internal reflection. The light guide strips comprise a plurality of localized light source regions (57) at a main front face (55A) for having light pass there through, wherein the light source regions (57) are provided along the light guide strip (91) within a non-source region (59). The light source (25) further comprising a plurality of light emitting units (41) for emitting light into the light guide strips (91) through respective portions of the at least one coupling face (47), and a collimation unit (45) extending along the main front face (55A) and comprising a plurality of collimating elements. Each collimating element, which may be a compound parabolic concentrator or TIR lens, comprises an input side and an output side, is optically associated to one of the plurality of light source regions (57), and is configured to receive light emerging from the associated light source region (57) at its input side and to emit collimated light (29) from a respective collimated light emitting region (61) formed at its output side. In another embodiment the light emitting units are configured to emit primary light having a spectral distribution that compensates for spectral losses accumulated by the primary light while propagating within the light guide unit. In a further embodiment the collimated light has a direction that is tilted with respect to the normal to a light emitting face of the light source. In an additional embodiment the ration of the area of the plurality of light source regions with respect to the area of the main front face and/or the area of the non-source region is less than or equal to 20%. In a further embodiment a plurality of reflective structures is associated with the light source regions.
Abstract:
In an aspect, a combined system (300) comprises a sun-sky imitating device (310) that is configured as an artificial illumination device (20) for generating light with a luminance profile and an appearance, which feature a directed-light component (314) and a first diffused-light component (316) that are emitted from a sun-sky imitating output area (312) for imitating the natural light from the sun and the sky, respectively, and the sun-sky imitating output area (312) has a transversal dimension (D310) of at least 7 cm, wherein the transversal dimension as the longest line segment joining two points of a perimeter of the sun- sky imitating output area (312). Moreover, the combined system (300) comprises a sky imitating device (320) that is configured as an additional diffused- light emitter to emit a second diffused-light component (326) from a sky imitating output area (322) for imitating the natural light from the sky only.
Abstract:
In an aspect, a chromatic reflective unit (1) comprises a support structure (7) comprising a plurality of non-coplanar surface sections (7'), a reflective layer (3) formed on the plurality of non-coplanar surface sections (7'), thereby forming a plurality of non- coplanar reflective surface sections (3'), respectively associated with one of the plurality of non-coplanar surface sections (7'), and a chromatic diffusing layer (5) having a back side provided at the reflective surface sections (3') and a front side for being illuminated by incident light (9), wherein the chromatic diffusing layer (5) comprises a plurality of nanoparticles (37) embedded in a matrix (39), and is configured to provide for - together with non-coplanar reflective surface sections (3') - a specular reflectance that is larger in the red than in the blue and for a diffuse reflectance that is larger in the blue than in the red.
Abstract:
An illumination system (1, 100, 200, 300) for providing an optically widened perception comprises a reflector unit (6, 206, 306) comprising a reflective surface (8A) and a luminous layer (10, 210, 310) for homogenously emitting diffuse light at a first color, the luminous layer (10, 210, 310) extending in front of the reflective surface (8A) and comprising a visible front area section (10A, 210A, 310A) of the reflector unit (6, 206, 306), which extends up to a first boundary (12A, 310A) and through which the diffuse light is emitted. The illumination system (1, 100, 200, 300) comprises further a light projector (2, 202, 302) configured to generate a light beam (3, 203, 303) adapted in size for comprehensively illuminating the visible front area section (10A, 210A, 310A) such that at least a portion of the light beam (3, 203, 303) passes through the luminous layer (10, 210, 310) before and after being reflected by the reflective surface (8A), thereby forming an illuminating light beam (3A) at a second color associated with a direct light correlated color temperature, and wherein the first color and the second color are separated in color space. The illumination system (1, 100, 200, 300) is further configured such that a perceivable light emission from a frame-like area next to and surrounding the visible front area (10A, 210A, 310A) section is essentially independent from the light beam (3, 203, 303) of the light projector (2, 202, 302).
Abstract:
A chromatic diffusing layer (510) comprises a plurality of nanoparticles (37) embedded in a matrix (39), for Rayleigh-like scattering with an average size d in the range 10nm≤d≤240nm, and a ratio between the blue and red scattering optical densities Log[R(450nm)3/Log[R(630nm)] of said chromatic reflective unit falls in the range 5≥γ≥2.5, where R(λ) 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 10nm ≤d≤240nm and for the direction normal to the reflective layer (508) of the chromatic reflective unit (506), the monochromatic normalized specular reflectance R(λ) of the chromatic reflective unit at a wavelength of 450nm is in the range from about 0.0025 to about 0.15, such as defined by the equations 0.0025≤R(450nm)≤0.15, 0.0025≤R(450nm) ≤0.05, 0.0025≤R(450nm) ≤0.04.
Abstract:
In an aspect, an illumination system (100) is disclosed to comprise a light source (102) configured to generate a light beam (103), and a chromatic reflective unit (1) for being illuminated by the light beam (103). The chromatic reflective unit (1) comprises a plurality of non-coplanar reflective surface sections (3'), and a chromatic diffusing layer (5) comprises a plurality of nanoparticles (37) embedded in a matrix (39), wherein the chromatic diffusing layer (5) is provided upstream of the plurality of reflective surface sections (3') such that at least a portion of the light beam (103) passes through the chromatic diffusing layer (5) before and after being reflected by the plurality of non-coplanar reflective surface sections (3'). Chromatic diffusing layer (5) is further configured to provide for - together with non- coplanar reflective surface sections (3') - a specular reflectance that is larger in the red than in the blue and for a diffuse reflectance that is larger in the blue than in the red.