ELASTIC WAVE DEVICE

摘要

An elastic wave device includes a piezoelectric substrate, first and second IDT electrodes disposed on a first main surface, and bumps each connected to one of the first and second IDT electrodes. First and second side portions extend in a direction perpendicular or substantially perpendicular to the polarization axis direction and to a direction normal to the piezoelectric substrate. The length of the piezoelectric substrate along the polarization axis direction at the first side portion is shorter than that at the second side portion. The first IDT electrode is located at a position closer to the first side portion than the second IDT electrode. The bumps include three or more first side bumps including first and second bumps that sandwich the first IDT electrode therebetween. The distance between the first and second bumps is the smallest distance among the distances between adjacent bumps of the first side bumps.

主权项

1. An elastic wave device comprising:
a piezoelectric substrate including first and second main surfaces which oppose each other and first and second side portions which oppose each other on the first main surface, a direction of a polarization axis of the piezoelectric substrate being inclined with respect to a direction normal to the first main surface; first and second interdigital transducer electrodes that are disposed on the first main surface of the piezoelectric substrate and that each include first and second busbars which oppose each other, a plurality of first electrode fingers, and a plurality of second electrode fingers, one end of each of the plurality of first electrode fingers being connected to the first busbar, one end of each of the plurality of second electrode fingers being connected to the second busbar; and a plurality of bumps that are disposed on the first main surface of the piezoelectric substrate and that are each electrically connected to a corresponding one of the first and second interdigital transducer electrodes; wherein the first and second side portions of the piezoelectric substrate extend in a direction perpendicular or substantially perpendicular to the direction of the polarization axis and to the direction normal to the first main surface, and a length of the piezoelectric substrate along the direction of the polarization axis at the first side portion is shorter than a length of the piezoelectric substrate along the direction of the polarization axis at the second side portion; the first interdigital transducer electrode is located at a position closer to the first side portion than the second interdigital transducer electrode in an extending direction of the plurality of first and second electrode fingers of the first interdigital transducer electrode; and the plurality of bumps include three or more first side bumps disposed along the first side portion, the three or more first side bumps including first, second, and third bumps, the first and second bumps sandwich the first interdigital transducer electrode therebetween in a direction parallel or substantially parallel with the first side portion, and a distance between the first and second bumps is the smallest distance among distances between adjacent bumps of the first side bumps.