Piezoelectric resonator with acoustic reflectors

A piezoelectric resonator for pressure, acceleration, and temperature sensors comprising a resonator core having holding discs on its opposite sides, said holding discs being formed of solid body layers, the dimensions of said layers measured in the direction of propagation of the piezoelectric stimulated sound wave each are 1/4 or an odd multiple of 1/4 of the length L of the sound waves in the respective layer corresponding to the resonance frequency of the resonator core, said holding discs being acoustic reflectors, said layers consisting alternatively of materials having significantly different specific acoustic impedance.