Patent ID: 8098434
Filing Date: 2012-01-17
Classification: G02B

Abstract:
1. A decollimator for a daylighting system, comprising: a conical section having a first end with a circular cross sectional shape, a second end with a square cross sectional shape opposite the first end, and a conical shape tapering inwardly from the first end to the second end of the conical section; a mixing zone section having a first end connected to the second end of the conical section, a second end opposite the first end, and a square cross sectional shape of a substantially constant cross sectional dimension; a window on the first end of the conical section, the window transmitting visible light; and a converging Fresnel lens on the window and partially covering the window, wherein when the first end of the conical section receives collimated light, the conical section, the mixing zone section, and the Fresnel lens together decollimate the collimated light and provide the decollimated light at the second end of the mixing zone section.