Patent ID: 6879419

Claim:
A scanner for transmitting at least two generally collimated beams of radiation of different frequencies such that the beams rotate about an axis to form a conical scanning pattern, the scanner comprising: a housing; a frame member rotatably mounted within said housing having an axis of rotation; motor for rotating said frame member about said axis of rotation; a concave parabolic first reflector having a geometric axis and a focus mounted to said frame member with said geometric axis angularly offset from said axis of rotation, said first reflector having an opening near said axis of rotation; a convex parabolic second reflector mounted to said frame member disposed along the rotation axis of said reflector and having a focus which is approximately co-located with the focus of said first reflector, said second reflector adapted to transmit at least one of the collimated beams of radiation and to reflect at least one of the collimated beams of radiation; a collimating lens disposed in proximity to said opening formed in said first reflector directing the at least two collimated beams of radiation through said opening formed in said first reflector and onto said second reflector; means for diffracting the at least one collimated beam of radiation transmitted through said second reflector outward from said axis of rotation such that as said frame member rotates the at least one beam of radiation transmitted through said second reflector is transmitted in a conical pattern.