Patent ID: 7362036
Filing Date: 2008-04-22
Classification: H01L,H02N

Abstract:
1. An ultrasonic oscillator, being the one having external electrodes connected with internal electrodes, each of which is alternately layered with each of piezoelectric elements, comprising: a group of internal electrodes divided into four approximately equal parts along two directions, i.e., a second direction which is perpendicular to a direction of layers as first direction, and a third direction which is also perpendicular to the first direction; and a first group of external electrodes and a second group thereof respectively connected with the internal electrodes, wherein an application of alternate voltage to the first and second groups of external electrodes excites a longitudinal oscillation mode which generates a main oscillation in the aforementioned second direction and simultaneously a bending oscillation mode which generates a main oscillation in the aforementioned third direction, thereby generating an ultrasonic elliptic oscillation; the ultrasonic oscillator comprising an electrode connection-use conductor film which is formed along a face perpendicular to the aforementioned direction of layers for electrically connecting a predetermined external electrode among the first group of external electrodes with a predetermined external electrode among the second group of external electrodes, respectively.