In a resonator having a dielectric member and an electrode formed on the dielectric member, a displacement area having a high vertical electric field component, and a short or steady area having a vertical electric field component of zero or close to zero are provided in an interface between the dielectric member and the electrode. The drive unit has a steering shaft supported by the bracket assembly for pivotal movement about a steering axis that extends generally vertically. A thermoplastic material which is miscible with the exterior film surface is fused to the refractive boundary with thermal energy below the delamination threshold to form a polydisperse region having a higher optical transmission than the refractive boundary. A modeclock signal connects to the mode input of the one circuit and to the clock input of the other circuit.