Patent ID: 9698755
Date: 2017-07-04
CPC Classifications: H03H

Claim:
1. A surface acoustic wave device comprising: a pair of comb electrodes that are provided on a piezoelectric substrate, and that respectively has a plurality of electrode fingers, a plurality of dummy electrode fingers and a bus bar to which the plurality of the electrode fingers and the plurality of the dummy electrode fingers are connected, edges of the plurality of the electrode fingers of one of the comb electrodes respectively facing the plurality of the dummy electrode fingers of the other; and an added film that is provided at least under the bus bar of the pair of the comb electrodes and under the plurality of the electrode fingers and the plurality of the dummy electrode fingers in a first region and is not provided in a crossing region where the plurality of the electrode fingers of the one of the comb electrodes and the plurality of the electrode fingers of the other cross each other, the first region being a region between front edges of the plurality of the dummy electrode fingers and edges of the plurality of the dummy electrode fingers connected to the bus bar and extending in an alignment direction of the plurality of the electrode fingers, wherein a region between the electrode fingers and the dummy electrode fingers in the first region have a portion without the added film.