| 摘要 |
<p>PURPOSE:To obtain a piezoelectric resonator where dispersion is low by preventing dielectric breakdown generated at the time of the polarization of a main ferroelectric substance ceramic plate. CONSTITUTION:When a main ferroelectric substance plate 1 is prepared by using Pb (Zr, Ti) O3 whose outside dimension is 52X52X0.35mm, for instance, silver electrodes 2 and 3 of 50X50mm angles are formed on these both main surfaces by a screen printing and parts where silver electrodes 1 and 2 of 0.5 to 1.5mm do not exist are provided on the edges of the silver electrodes 2 and 3 and the main surface. Next, when a resonator to be a resonance frequency Fr=438.5kHz and an antiresonant frequency Fa=455kHz is prepared by using the ceramic plate 1 where the silver electrodes 2 and 3 are formed, perform the followings. Namely, the + side and - side of a DC power source 4 are connected with the silver electrodes 2 and 3, respectively, DC high voltage 200+ or -20V is added so that the difference of the resonance frequency and the antiresonant frequency of DELTAFa-Fr may be 16.5kHz, a polarization 6 is provided, generating electric field 5 in the ceramic plate 1, the polarization 6 is made to exist even if impression voltage is eliminated and a main piezoelectric ceramic plate 7 showing a piezoelectricity is made.</p> |
