Manufacturing method of an ultrasonic generating device, and manufacturing method of an ultrasonic treatment device

摘要

A manufacturing method of an ultrasonic generating device includes calculating performance value based on a first electromechanical coupling factor in thickness directions and a second electromechanical coupling factor in diametrical directions for each of existing piezoelectric elements, calculating, for each of temporary conditions, a temporary influence value on the basis of a deviation of temporary amplitude of the ultrasonic vibrations, generated by the supply of the current having the predetermined current value, from a target amplitude in a target condition. The manufacturing method includes selecting the corresponding mounted piezoelectric element to be mounted on each of the element mounting portions from the existing piezoelectric elements so that the sum of actual influence values of all the element mounting portions is within a predetermined range with respect to the target amplitude.

主权项

1. A manufacturing method of an ultrasonic generating device, the manufacturing method comprising:
calculating performance value based on a first electromechanical coupling factor in thickness directions and a second electromechanical coupling factor in diametrical directions for each of existing piezoelectric elements; setting a target condition where ultrasonic vibrations having target amplitude are generated when a corresponding reference piezoelectric element having the performance value equal to a reference value is mounted on each of a plurality of element mounting portions located at positions different from one another in a transmission direction of the ultrasonic vibrations and when a current having a predetermined current value is supplied; calculating, for each of temporary conditions, a temporary influence value on the basis of a deviation of temporary amplitude of the ultrasonic vibrations, generated by the supply of the current having the predetermined current value, from the target amplitude in the target condition, a temporary piezoelectric element having the performance value different from the reference value being mounted on only one element mounting portion instead of the reference piezoelectric element in each of the temporary conditions as compared with the target condition, the temporary conditions being set for each of the element mounting portions on which the temporary piezoelectric element is mounted and for each of the performance values of the temporary piezoelectric elements; selecting the corresponding mounted piezoelectric element to be mounted on each of the element mounting portions from the existing piezoelectric elements so that the sum of actual influence values of all the element mounting portions is within a predetermined range with respect to the target amplitude, when the temporary influence value in the corresponding temporary condition, in which the temporary piezoelectric element having the same performance value as the mounted piezoelectric element to be actually mounted is mounted, is used as the actual influence value in each of the element mounting portions; and mounting the selected corresponding mounted piezoelectric elements on each of the element mounting portions so that the thickness directions thereof are parallel to the transmission direction of the ultrasonic vibrations and so that the diametrical directions thereof are perpendicular to the transmission direction of the ultrasonic vibrations.