LED light source

摘要

Proposed is a lighting module 100 and an illumination device 200 comprising such a module. The lighting module comprises an array of LEDs 120 mounted on a substrate 110 and an optical structure 130 encompassing the LED array for approximating in operation the LED array as a single homogeneous light source. The optical structure comprises an optical element 140 arranged to provide a luminous intensity profile as a function of a deviation angle a which is substantially constant between −αmax and αmax, wherein αmax is a maximum deviation angle provided by the optical element and substantially zero at angles outside that range. This is especially advantageous for optimizing the trade off between creating a single homogenous light source and maintaining the entendue of the light source. An additional advantage of the optical element 140 is that, except for fresnel reflections on both surfaces, it has no backscattering like a diffuser has, which results in a very low optical loss.

主权项

1. A lighting module comprising:
a substrate, an array of light emitting diodes mounted on the substrate; and an optical structure encompassing the array of light emitting diodes for approximating in operation the array of light emitting diodes as a single light source, wherein the optical structure comprises a plurality of optical elements, wherein each optical element of the plurality of optical elements is arranged to provide, when observing a given light emitting diode of the array through the optical element with the lighting module in operation, a luminous intensity profile I as a function of a deviation angle α which is substantially constant between −αmax and αmax, wherein the deviation angle is an angle between a central line and light rays forming an image of the given LED appearing from the optical element, wherein the central line is formed between the center of the given LED and the center of the optical element wherein αmax is the angle between the central line and a light ray defining an outer edge of the image of the given LED appearing from the optical element, and wherein the magnitude of αmax provided by each optical element depends on the position of the optical element on the optical structure.