Patent ID: 9222643
Filing Date: 2015-12-29
Classification: F21V,F21W,F21Y

Abstract:
1. A method for improving color uniformity of an LED (light emitting diode)-based stage lighting system, the LED-based stage lighting system including an LED arrays having a plurality of LED chips emitting different color lights packaged on a heat dissipating substrate, the method comprising: A. combining light from the plurality of LED chips into one combined light beam; B. directing the combined light beam via a focusing lens to a light output port of the stage lighting system; and C. controlling light emission of the plurality of LED chips of different colors in the LED arrays to obtain an output light at the light output port having predefined colors or color variation; wherein in step B, the combined light beam is directed to pass through a fly-eye lens pair to illuminate on the focusing lens; wherein the fly-eye lens pair includes two fly-eye lenses facing each other, each fly-eye lens being formed of a plurality of lens units that have a same lens surface curvature and are tightly jointed to each other, wherein a rear fly-eye lens of the fly-eye lens pair is disposed along an optical path on a focal plane of a front fly-eye lens of the fly-eye lens pair, wherein the fly-eye lens pair is formed as one integral unit, and wherein two surfaces of the fly-eye lens pair facing optical path in two directions have a wavelike shape.