To suppress the spurious due to a thickness tilt of a piezoelectric element in the shape of a vibration electrode for a thickness vertical containment type piezoelectric resonator by adding a rectangular vibration electrode to a piezoelectric element that has a tilt in its thickness direction.
A piezoelectric resonator 8 consists of the rectangular vibration electrodes 2 and 3, the extraction electrodes 4 and 6 and the connection electrodes 5 and 7 which are formed on both opposite main surfaces of a piezoelectric element 1. The electrode 2 is connected to the electrode 4 positioned at a point near one of both ends of the element 1 in its longer side direction via the electrode 5, and the electrode 3 is connected to the electrode 6, positioned at a point near the other end of the element 1 in its longer side direction via the electrode 7 respectively. For example, if the element 1 has the thickness vertical containment type resonance frequency of about 25MHz and has a ratio of 0.03 to 0.1% set for a thin part with respect to a thick part of the element 1, the spurious can be reduced most effectively with a ratio of 50 to 70%, set for the shorter side with respect to the longer side of a vibration electrode.
MORITOKI KATSUNORI
NAKAJIMA YASUO
IKEDA HIROYASU
DOI TOSHIKATSU
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