Patent ID: 11962282
Assignee: TAIYO YUDEN CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An acoustic wave device comprising:
a support substrate;
a piezoelectric layer provided over the support substrate;
at least one pair of comb-shaped electrodes disposed on the piezoelectric layer, each of the at least one pair of comb-shaped electrodes including electrode fingers;
a temperature compensation film interposed between the support substrate and the piezoelectric layer, the temperature compensation film having a temperature coefficient of elastic constant opposite in sign to a temperature coefficient of elastic constant of the piezoelectric layer; and
an insulating layer interposed between the support substrate and the temperature compensation film, a first surface of the insulating layer having a plurality of first protruding portions and/or a plurality of first recessed portions, a second surface of the insulating layer having a plurality of second protruding portions and/or a plurality of second recessed portions, the first surface being closer to the support substrate, the second surface being closer to the temperature compensation film,
wherein |D1−D2|/(D1+D2) is equal to or less than 0.05 where D1 represents a regular interval between the plurality of first protruding portions and/or the plurality of first recessed portions and D2 represents a regular interval between the plurality of second protruding portions and/or the plurality of second recessed portions.