Bearingless oscillating scanner

摘要

A bearingless scanner having a mirror supported for oscillations with simple harmonic motion at resonance by pairs of spiral springs arranged at opposite sides of the mirror. The springs of each pair are attached at points spaced 180 DEG apart between the mirror structure and a foundation such that the force couples produced by each pair of springs are equal and opposite. A torsion spring supports the mirror structure along the axis of the oscillating motion. A drive system without bearings supplies torque in resonance with the harmonic motion and in a manner without producing residual forces on the structure for the scanner.