Acoustic wave element and acoustic wave device using same

摘要

The IDT electrode has the first bus bar and second bus bar; the plurality of first electrode fingers and the plurality of second electrode fingers mutually intersect; the plurality of first dummy electrodes and the plurality of second dummy electrodes which have front ends facing front ends of the plurality of first electrode fingers and the plurality of second electrode fingers with the gap s1; the plurality of first auxiliary electrodes which protrude laterally from the front end side portions of the pluralities of first dummy electrodes; and the plurality of second auxiliary electrodes which protrude laterally from the front end side portions of the plurality of second dummy electrodes. The plurality of first auxiliary electrodes have edge portions located a side of the second bus bar. The edge portions are located a side of the second bus bar the more to a side of the front end.

主权项

1. An acoustic wave element, comprising:
a piezoelectric substrate; and an IDT electrode located on a top surface of the piezoelectric substrate; wherein the IDT electrode comprises
a first bus bar and a second bus bar which face each other in a direction perpendicular to a propagation direction of an acoustic wave,a plurality of first electrode fingers which extend from the first bus bar toward the second bus bar and are aligned in the propagation direction,a plurality of second electrode fingers which extend from the second bus bar toward the first bus bar, are aligned in the propagation direction, and mutually intersect with the plurality of first electrode fingers,a plurality of first dummy electrodes which extend from the first bus bar toward the second bus bar, are aligned in the propagation direction, and comprise front ends which face front ends of the plurality of second electrode fingers with a gap,a plurality of second dummy electrodes which extend from the second bus bar toward the first bus bar, are aligned in the propagation direction, and comprise front ends which face front ends of the plurality of first electrode fingers with a gap,a plurality of first auxiliary electrodes which protrude toward sides from front end side portions of the plurality of first dummy electrodes, anda plurality of second auxiliary electrodes which protrude toward sides from front end side portions of the plurality of second dummy electrodes, at least part of the plurality of first auxiliary electrodes comprise edge portions located near a side of the second bus bar, the edge portions being located closer to the side of the second bus bar the closer the edge portion is to a side of the front end, and at least part of the plurality of second auxiliary electrodes comprise edge portions located near a side of the first bus bar, the edge portions being located closer to a side of the first bus bar the closer the edge portion is to a side of the front end.