| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic wave element capable of reducing the distortion signal.SOLUTION: A SAW element 1 has a piezoelectric substrate 3, electrode fingers 13 of a first interdigital electrode 9A provided on the piezoelectric substrate 3, the electrode fingers 13 of a second interdigital electrode 9B provided on the piezoelectric substrate 3, and arranged alternately to the electrode fingers 13 of a first interdigital electrode 9A at a constant pitch, thinned electrodes 19 located in the arrangement of these electrode fingers 13, and extending in parallel with the electrode fingers 13, in a range corresponding to odd numbers of 3 or more, and a pair of outer electrodes Fe adjacent to the outside of the end electrode fingers Fb at the opposite ends of the IDT electrode 5 in the propagation direction of the SAW, and are in non-contact with any of the first interdigital electrode 9A and second interdigital electrode 9B. The end electrode fingers Fb at the opposite ends are the electrode fingers 13 of the first interdigital electrode 9A, and the number of thinned electrodes 19 in the first interdigital electrode 9A is smaller than the number of thinned electrodes 19 in the second interdigital electrode 9B by 1.SELECTED DRAWING: Figure 4 |
