PIEZOELECTRIC RESONATOR Russian patent published in 1998 - IPC

FIELD: piezoelectric engineering; electroacoustic devices. SUBSTANCE: piezoelectric resonator has holder, crystal element in the form of circular plate with local boss in central part and exciting electrodes symmetrical to local boss in central part; local boss is shaped as ball segment on one or both sides. Ball segment may be made in the form of stepped structure with step number equal to or greater than three. Ball boss base diameter d_c is specified within 1/3•D ≤ d_c≤ 2/3•D, range, where D is crystal element diameter; segment sphere radius R is chosen according to expression , where h is planar crystal element thickness corresponding to desired frequency. EFFECT: reduced size of piezoid and resonator as a whole; facilitated manufacture of resonators while maintaining their multifrequency arrangement and high quality. 2 dwg