A light concentrator, preferably for use with a color optical scanning device includes a reflector (34) with parabolic reflecting walls (36). Green LEDs (22), red LEDs (24), and blue LEDs (26) are situated at the base of the reflector (34) and a diffuser (30) is attached to the opposite end thereof....http://www.google.es/patents/US5255171?utm_source=gb-gplus-sharePatente US5255171 - Colored light source providing intensification of initial source illumination
Colored light source providing intensification of initial source illumination
