LED LIGHTING UNIT

摘要

An LED lighting unit comprising a support structure (14), an LED-based light emitting structure (10) mounted within the support structure and an optical beam shaping arrangement (50, 52) over the top of the support structure. The optical beam shaping arrangement comprises an optically transparent and thermally stable material, and the support structure supports the microstructured layer at a small height above the LED-based light emitting structure. This height may for example be less than 0.5 mm. The optical beam shaping arrangement enables a compact and low height lighting unit to be mounted on a carrier by reflow soldering without damaging the optical beam-shaping component.

主权项

1. A LED lighting unit comprising:
a support structure an LED-based light emitting structure mounted within the support structure; and an optical beam shaping arrangement over the top of the support structure and supported by the support structure, wherein a first material is provided between the LED-based light emitting structure and the beam shaping arrangement, the first material having a first refractive index, wherein the optical beam shaping arrangement comprises a microstructured layer positioned at a height of less than the square root of a light emitting area of the LED-based light emitting structure above the LED-based light emitting structure, and wherein the microstructured layer comprises an optically transparent and thermally stable material with a refractive index different from the first refractive index, and at least one array of micro-elements, each micro-element having one or more sides which meet at a top apex, wherein the side or sides are straight from their base to the top apex.