PIEZOELECTRIC SUBSTRATE, PIEZOELECTRIC VIBRATION ELEMENT, SURFACE MOUNT PIEZOELECTRIC VIBRATOR AND SURFACE MOUNT PIEZOELECTRIC OSCILLATOR

摘要

PROBLEM TO BE SOLVED: To obtain a small Lame-mode crystal vibrator operating at frequencies of 10 MHz and below and having a large Q value.;SOLUTION: A piezoelectric vibration element is provided with: a piezoelectric substrate 6 consisting of a piezoelectric substrate body 7 made of a piezoelectric material contour-vibrating based on excitation, and a protrusion 10 made of the material same as that of the piezoelectric substrate and formed upright on at least the one surface side of a portion as a knot of the contour vibration of the main surface of the piezoelectric substrate body; and excitation electrodes formed on both the main surfaces of the piezoelectric substrate surface. The protrusion is formed upright on the knot of the contour vibration positioned on the center of the piezoelectric substrate body or the circumferential edge portion.;COPYRIGHT: (C)2009,JPO&INPIT