Apparatus for controlling the re-distribution of light emitted from a light-emitting diode

摘要

A system for re-distributing light emitted from a light source using an optical element is described. The optical element is manufactured using a bulk matrix material, and diffusing particles and/or scattering particles are embedded within the bulk material. The optical element is coupled to the light source to capture emitted light and redistribute the light in a desired angular distribution pattern depending on the ratio of total weight of diffusing particles to total weight of scattering particles.

主权项

1. A system, comprising:
a source configured to emit electromagnetic radiation having a first angular distribution pattern; an optical element coupled to the source, wherein the optical element comprises a bulk material, a first type of particle substantially uniformly distributed throughout the bulk material, and a second type of particle substantially uniformly distributed throughout the bulk material, wherein the first type of particle has a first concentration by weight within the bulk material, and the second type of particle has a second concentration by weight within the bulk material, and further wherein the optical element has a shape that captures the first angular distribution pattern and emits a second angular distribution pattern; wherein the first and second angular distribution patterns provide a light distribution pattern with a light distribution uniformity between 0.6 and 1.4, the light distribution uniformity is given by:U=∫-110⁢°-130⁢°⁢I⁢ⅆθ+∫110⁢°130⁢°⁢I⁢ⅆθ2⁢∫-10⁢°10⁢°⁢I⁢ⅆθ, wherein I corresponds to emitted intensity in a given direction.