OPTCAL ELEMENT FOR UNIFORM LIGHTING

摘要

There is provided an optical element (100) for use with a LED (102) wherein a base face (103) is arranged to receive incoming light from the LED (102). The optical element (100) comprises a top face (104) having a pattern (108) of optical structures (110) which refract light away from an optical axis (A) of the optical element (100). Further the optical element (100) comprises a plurality of side faces (106) extending between the top face (104) and the base face (103) and arranged to refract light from the light towards the optical axis (A). In order to avoid total internal reflection at the top face (104), the top face (104) extends such that it covers a first angular range relative to the optical axis (A). The first angular range is an angular range outside which light emitted by the LED (102) would be subject to total internal reflection at an imaginary extension of the top face. The optical element (100) is advantageous in that it provides a more uniform illumination pattern without leading to energy losses.

主权项

1. An optical element for use with a LED, comprising:
a base face arranged to receive incoming light from the LED, a top face having a normal extending in a direction from the base face (103) to the top face and defining an optical axis, wherein the top face extends such that it covers a first angular range relative to the optical axis, outside of which first angular range light emitted by at least one point of the LED would be subject to total internal reflection at an imaginary extension of the top face, and wherein the top face comprises a first pattern of first optical structures which are arranged to refract light originating from the LED away from the optical axis; and a plurality of side faces extending between the base face and the top face, the plurality of side faces being arranged to refract light originating from the LED towards the optical axis.