Patent ID: 11681131

Abstract:
A multi-color LED illumination device and a lens, comprising a cylindrical opening extending into the lens from a light entry region at which one or more LEDs are configured. A concave spherical surface extends across an entirety of a light exit region of the lens, and a TIR outer surface shaped as a CPC extends between the light entry region and the light exit region. There are various diffusion elements placed on sidewall and upper planar surfaces of the cylindrical opening, as well as on the exit surface of the lens. Lunes can also be configured on the sidewall surfaces of the cylindrical opening. The combination of lunes, diffusion elements, and the overall configuration of the lens provides improved color mixing and output brightness using three interactions in a first portion of light and two interactions in a second portion of light. The interactions include two refractions, either with or without an intermediate reflection.