Quartz resonator vibrating in a fundamental torsion mode

Abstract

A thin quartz plate having opposite major surfaces, each of the opposite major surfaces having a geometrical shape symmetrical or antisymmetrical with respect to an axis of reference; and X, Y and Z crystallographic directions corresponding to electrical, mechanical and optical axes, respectively, of the quartz plate, wherein the axis of reference forms an angle .psi. with said X axis, and the major surfaces form an angle .theta. with a plane defined by said X and Y axes, the angles .theta. and .psi. being chosen such that the first order frequency-temperature coefficient (.alpha.) of the quartz resonator is substantially 0, and the second order frequency-temperature coefficient (.beta.) of said quartz resonator is substantially 0. The shape of the resonator may be rectangular, square, polygonal, circular or elliptical. The resonator is fixed on a supporting base by means of at least one pair of connecting arms located on the extension of a nodal line. The resonator of the invention finds application in the field of relatively low frequency miniature resonators suitable for encapsulation.

Dependencies are inferred from the claim text.