Patent ID: 7245193
Filing Date: 2007-07-17
Classification: H03H

Abstract:
1. A surface acoustic wave element, comprising: a substrate formed of a material selected from the group consisting of semiconductor material, crystalline quartz, glass, ceramic, and resin; a piezoelectric layer arranged on the substrate and mainly formed of a piezoelectric material; an intermediate layer provided between the piezoelectric layer and the substrate for setting the characteristics of the surface acoustic waves excited in the piezoelectric layer, the intermediate layer being formed of a material which contains as a major component thereof at least one material selected from the group consisting of diamond, silicon, silicon nitride, glass, crystalline quartz, lithium tantalate and potassium niobate; an interdigital transducer arranged on the piezoelectric layer for at least one of: and the interdigital transducer including a plurality of electrode fingers juxtaposed with a prescribed spacing; and a reflector arranged adjacent to the interdigital transducer on the piezoelectric layer, the first reflector including a plurality of reflecting bodies juxtaposed with a prescribed spacing, wherein a pitch of the reflecting body of the reflector is smaller than a pitch of the electrode finger of the interdigital transducer; wherein an average thickness of the substrate is in a range of 0.1 to 0.8 mm.