U.S. Philips Corporation

Philips Electronics North America Corporation

Lumileds Lighting U.s., LLC

Lumileds Lighting B.v.

Matthijs H Keuper

Michael D Pashley

Thomas M Marshall

Antonius J Van Hees

A luminaire comprising a set of light sources, in particular LEDs, which are arranged predominantly in a first plane, and a set of substantially identical optical sources arranged predominantly in a second plane extending parallel to the first plane. The position of one of the light sources with respect to an optical clement opposite said light source differs from the position of a further light source with respect to an optical element opposite said light source.

Luminaire, optical element and method of illuminating an object

Apparatus for mixing light from discrete LED light sources utilizes beam splitters which each have a semi-reflective layer which partially transmits and partially reflects light of any wavelength incident thereon. Each semi-reflective layer is situated in a transparent prismatic black between reflective surfaces on parallel outside faces of the block so that two parallel input beams are mixed and transmitted as two parallel mixed beams of like color. For a square array of light sources, a first mixing stage consists of two such prismatic blocks arranged side-by-side, and a second mixing stage consists of two such prismatic blocks arranged side-by-side and rotated 90 degrees to the first stage. The second stage is arranged to receive a square array of mixed beams and produces four identical output beams. The colors of the light sources are chosen so that all output beams are white.

Luminaire having beam splitters for mixing light from different color    '

The invention relates to a signal lamp comprising a box-shaped housing having an open end, a number of LEDs being provided in the housing and the open end of the housing being closed by means of a spreading window. The invention is characterized in that the LEDs are clustered around the central axis of the housing and in that the lamp comprises a positive lens (preferably a fresnel lens). The signal lamp in accordance with the invention provides an optimum, homogeneous brightness distribution on the surface of the spreading window. Preferably, the lens has a focal distance f, the LEDs are arranged at a distance v from the lens, and 0.55&lt;v/f&lt;0.975. This measure contributes to the intended optimum homogeneous brightness distribution.

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Eindhoven, Netherlands

Matthijs H Keuper