High Definition Selective Laser Sintering 3D Printer.
The core engine of an SLS/SLM AM printer is the Optical Scanner. Typically, either a galvanometer (GS) or a Polygonal Mirror (PM) scanner has been used, but both have been pushed to their mechanical limits. Both scanners suffer from inconsistency in energy deposition because of changes in Optical Path Length (OPL), Surface Beam Speed (SBS), and angle of incidence(Θ).
The Lens Free Optical Scanner (patented by Tecnica, Inc., Great Neck, New York), provides a simple scanning method, linear transfer functions, fixed OPL, and an incident beam normal to the work surface.