Patent ID: 8238008

Claim:
A laser transmitter for projecting a beam of laser light outward while raising and lowering the beam to define conical surfaces of varying inclination, comprising: a laser source directing a beam generally vertically, a beam diverting element in the path of the beam, intercepting the beam and redirecting it to emerge from the transmitter as a non-vertical beam that is raised and lowered to provide conical reference surfaces of varying inclination, said beam diverting element includes a conical reflective surface intercepting the beam and redirecting it outward as a thin, horizontally diverging, generally horizontal beam, an annular lens having a cylindrical inner surface and a convex outer surface, and a piezoelectric element for raising and lowering said annular lens, said annular lens altering the elevation angle direction of said beam, such that said beam elevation angle is raised and lowered.