A light beam projector device having a light source and a reflector arranged to direct the light originating from the light source in such a manner as to form a light beam, said reflector having a curved concave reflecting surface with a geometrical focus where the light source is positioned, at least...http://www.google.es/patents/US6161945?utm_source=gb-gplus-sharePatente US6161945 - Projector device for a multi-color light beam
