"As used herein, the term 'center of a cavity' refers to a point of symmetry (e.g. the center of a circle or a regular polygon, or the axis of symmetry), or a focus point lying on such an axis of symmetry (e.g. one of the foci of an ellipse or parabola).
"Providing an optical module that includes two or more segments where each segment comprises its own light source allows obtaining higher lumen output compared to prior art luminaires having only one light source. Within each segment, a light source is positioned within its own source cavity. Arranging the segments in such a manner that the center of each source cavity coincides with the optical axis of the collimating structure of the segment allows preserving narrow beamwidth collimation of the light exiting the optical module.
"According to another aspect of the invention, a light output device or a luminaire comprising such an optical module is provided.
"Embodiments of claims 2-5 advantageously allows guiding light provided by each of the light sources towards the light collimating structure of the corresponding segment. Placing specular mirrors at certain key positions, such as e.g. in the back of the cavities, may aid in directing the light from each light source into the proper corresponding collimating optics, resulting in a dramatic increase of the luminaire efficiency.
"Embodiment of claim 6 specifies that the collimating structure may comprise a light guide, such as e.g. a wedge-shaped light guide, and a re-direction layer, such as e.g. a redirection foil. In one embodiment, the light guide may be substantially rotational symmetric in a plane, with the center of symmetry of the light guide coinciding with the center of the cavity. Rotational symmetry enables for provision of a symmetric light beam which often is desirable in lighting applications, such as in downlighting applications.
"Embodiment of claim 7 specifies an advantageous structure for the light guide.
"Embodiment of claim 8 provides that the optical module may further include a light transmitting layer adapted to transmit light diffusively and arranged to cover at least a portion of the light-entry surface of the light guide. The light transmitting layer allows for controlled and efficient incoupling of diffuse light transmitted from a comparatively large area into the light guide. Dimensioning of the light guide allows for forming the incoupled light into a light beam having predetermined properties when leaving the light guide, which properties allow for fulfillment of luminaire requirements, e.g. as regards to angular distribution and glare. The light transmitting layer may be a light transmissive layer adapted to diffuse incident light and output the diffused light from the side of the layer facing the light-entry surface. Hence, problems related to light source brightness can be remedied or alleviated without using a diffuser at the luminaire output.
"Embodiment of claim 9 provides that the light transmitting layer may also be a light emitting layer adapted to emit light in response to excitation. The light emitting layer may thus be a layer that can generate light and not a translucent layer that merely forwards light through the layer. The light emitting layer may be a layer adapted to emit light in response to excitation by light, preferably a phosphor layer. It has been found that increased efficiency is particularly desirable/needed in slim luminaires (large light output area compared to thickness) from which a uniform and 'non-glare' light is desirable to provide. In such luminaires the active phosphor area for re-generating the light will be relatively small compared to the total light output area of the luminaire (in order to be able to provide collimated light within glare requirements and still keep the luminaire thin).
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