公开(公告)号：EP2128982A4

公开(公告)日：2013-07-24

申请号：EP08721995

申请日：2008-03-13

Applicant: MURATA MANUFACTURING CO

Inventor： KANDO HAJIME ,  KIDO SHUNSUKE ,  NAKAO TAKESHI ,  YAMAMOTO DAISUKE

IPC: H03H9/145 ,  H03H9/00 ,  H03H9/02

CPC classification number: H03H9/02921 ,  H03H9/0071 ,  H03H9/02858 ,  H03H9/02881 ,  H03H9/14538 ,  H03H9/14594

Abstract: There is provided an acoustic wave element that enables an improvement of resonance characteristics at the vicinity of a resonance frequency and that prevents short-circuit failure between electrode fingers and degradation in insulation properties. In an acoustic wave element (1), an IDT electrode (3) is in contact with a piezoelectric material. The IDT electrode (3) includes a plurality of electrode fingers. The plurality of electrode fingers include first and second electrode fingers (31 and 32) that adjoin each other in an acoustic wave propagation direction and that connect to different potentials and a first dummy electrode finger (34) facing the first electrode finger (31) via a gap (33) placed on an outer side in an electrode finger length direction of the first electrode finger (31). At the vicinity of the gap, first protrusions (11 to 14) are provided in at least one of the first electrode finger (31) and the first dummy electrode finger (34), the first protrusion protruding in the acoustic wave propagation direction from at least one of side edges of the electrode finger.