Patent ID: 9413330
Filing Date: 2016-08-09
CPC Classification: H03H

Claim Text:
1. An elastic wave resonator comprising: a piezoelectric substrate; and an inter-digital transducer (IDT) electrode provided on the piezoelectric substrate, the IDT electrode having a staggered region in which electrode fingers of a comb electrode alternate with electrode fingers of an opposite comb electrode, the staggered region having a width in an electrode finger extending direction that tapers toward an end portion of the staggered region in an elastic wave propagation direction, the staggered region including, in a central portion, a constant pitch region in which an electrode finger pitch is substantially constant, and, on outer sides of the constant pitch region, reduced pitch regions in which an electrode finger pitch is less than the electrode finger pitch in the constant pitch region, a width of the constant pitch region in the electrode finger extending direction tapering toward an end portion of the constant pitch region in the elastic wave propagation direction.