Distortion optics are used to efficiently couple a spiral color wheel and an orthogonal modulator. Light 602 from a light source enters an aperture in a reflective end of a recycling integrator rod 604. The light travels through the rod and exits the end of the rod adjacent a sequential color filter...http://www.google.se/patents/US6591022?utm_source=gb-gplus-sharePatent US6591022 - Illumination system for scrolling color recycling
