Optical scanning system with correction
View Patent ↗A scanning system device has a predetermined aberration as it scans or switches light along selected optical paths. A deformable membrane receives the light and introduces an inverse “aberration” that offsets that of the scanning system. In one embodiment the scanning system includes a torsion arm that supports an oscillatory body. The torsion arm and/or body can be machined from metal, micromachined in silicon or formed in a variety of other ways. Alternatively, the scanning system may include a rotating polygonal scanner or other type of optical scanner. In another approach, an optical switch replaces the scanner.
1. A scanning apparatus, comprising:
a primary mirror that moves through a predetermined scan path at a selected scan rate having a scanning period that defines a scanning frequency; and
a resonant reflector aligned to the primary mirror and being of the type that moves resonantly through a movement path at a resonant frequency, wherein the resonant frequency is an integral multiple of the scanning frequency; and wherein the resonant reflector comprises a deformable microelectromechanical (MEMS) reflective membrane aligned to reflect light reflected from the primary mirror and wherein the movement path includes deformation of the membrane.