Patent ID: 7480086

Claim:
An optical pattern generator that creates a pattern of figures on a target surface, the pattern generator comprising: a first multi-faceted rotating optical element having a rotational axis and a plurality of facets with optical power that rotate around the rotational axis, at least two of the facets having different optical power; a second multi-faceted rotating optical element located downstream of the first optical element, the second optical element having a rotational axis and a plurality of facets with optical power that rotate around the rotational axis, at least two of the facets having different optical power; each facet with optical power on the first optical element having a corresponding facet with optical power on the second optical element, the first and second optical elements counter-rotating through an incident optical beam; and one or more imaging optical elements that focus the optical beam, creating a pattern of figures on a target surface as the optical elements counter-rotate through the optical beam.