Patent ID: 6964196

Claim:
Apparatus for providing a resonant movement about a first axis, said apparatus comprising: a device integrally formed from a single piece of material comprising a functional surface portion, and a first pair of torsional hinges attached to said functional surface portion and extending to a support portion for pivoting said functional surface portion about said first axis wherein said functional surface portion further includes a first material thereon for interacting with a second material such that the combined mass of said functional surface position and said first material is changed, and wherein said first material readily absorbs moisture; a driver circuit for generating vibrational energy in said support portion and wherein said vibrational energy is inertially coupled from said support portion through said first pair of torsional hinges to said functional surface portion such that said functional surface portion oscillates about said first pair of torsional hinges at a resonant frequency, and wherein said resonant frequency changes with changes in the mass of said functional surface portion.