Patent ID: 7878658

Claim:
A prism capable of being utilized in a projector, comprising: a first window disposed on a first surface through which the beam is capable of passing to impinge upon a scan engine at an angle of incidence off axis from an axis normal to a plane of the scan engine, wherein the scan engine is capable of directing the beam in a predetermined scan pattern; a second window disposed on a second surface through which the beam is capable of passing; wherein the first surface is non-parallel to the second surface to reduce distortion of the scan pattern from the scan engine; and three or more internal surfaces capable of reflecting the beam onto the scan engine off axis via a combination of reflections, and further capable of imparting a desired polarization state to the beam reflected onto the scan engine via the combination of reflections, wherein at least one of the combination of reflections changes the direction of the beam in a first direction and in a second direction orthogonal to the first direction.