A scanning beam assembly comprising: a beam generator to generate a beam of radiation, and two or more oscillating reflectors configured to deflect the beam in sequence, each reflector being driven to contribute an incremental deflection of the beam so as to achieve a desired scanning beam waveform,...http://www.google.es/patents/US7561317?utm_source=gb-gplus-sharePatente US7561317 - Resonant Fourier scanning
