Patent ID: 6545386
Filing Date: 2003-04-08
Classification: H03H

Abstract:
A method for adjusting the frequency of a piezoelectric resonator, in which the frequency of each of elements disposed on a piezoelectric substrate is adjusted by irradiating an ion beam onto a plurality of electrodes provided on the piezoelectric substrate to etch the electrodes, the method comprising the steps of:determining a correlation between time for ion-beam irradiation and the amount of frequency changes; measuring the frequency of each of the elements disposed on the piezoelectric substrate; determining the amount of frequency adjustment for each of the elements based on a difference between the measured frequency value and a target frequency value; determining an ion-beam irradiation time for each of the elements based on the determined amount of frequency adjustment by using the correlation; irradiating an ion beam onto each of the elements during the determined ion-beam irradiation time; measuring the current density of the ion beam; comparing the measured current density value with a maximum value and a minimum value; and adjusting the intensity of the ion beam when the current density is above the maximum value and below the minimum value.