公开(公告)号：US20230387882A1

公开(公告)日：2023-11-30

申请号：US18322254

申请日：2023-05-23

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Mayu TSUKADA ,  Shodai HARAI

IPC: H03H9/145 ,  H03H9/64

CPC classification number: H03H9/145 ,  H03H9/72 ,  H03H9/6413 ,  H03H9/6483

Abstract: An acoustic wave resonator includes comb-shaped electrodes each including electrode fingers and dummy electrode fingers, first tips of the electrode fingers of one of the comb-shaped electrodes and second tips of the dummy electrode fingers of the other facing each other, each dummy electrode finger including a first portion located closer to the corresponding second tip and a second portion located farther from the corresponding second tip than the first portion, the first portion being narrower in a short direction than the second portion, and an insulating film that is provided from an edge region of an overlap region to a first region, where the first portions of the dummy electrode fingers are located, of a dummy region and is provided in neither a central region of the overlap region nor a second region, where the second portions of the dummy electrode fingers are located, of the dummy region.

公开(公告)号：US20240322784A1

公开(公告)日：2024-09-26

申请号：US18591121

申请日：2024-02-29

Applicant: TAIYO YUDEN CO., LTD.

Inventor： Mayu TSUKADA

IPC: H03H9/02 ,  H03H9/145 ,  H03H9/64

CPC classification number: H03H9/02637 ,  H03H9/145 ,  H03H9/6483

Abstract: An acoustic wave device includes a piezoelectric body, a pair of comb-shaped electrodes provided on the piezoelectric body, the pair of comb-shaped electrodes including a plurality of electrode fingers, a reflector provided on the piezoelectric body so as to be arranged in line with the pair of comb-shaped electrodes in an arrangement direction of the electrode fingers, and an additional film provided on the piezoelectric body between the pair of comb-shaped electrodes and the reflector so that an overlap width with the pair of comb-shaped electrodes and an overlap width with the reflector are equal to or less than 1/8 of an average pitch of the electrode fingers of the pair of comb-shaped electrodes and a distance between the additional film and the pair of comb-shaped electrodes and a distance between the additional film and the reflector are equal to or less than 1/8 of the average pitch.