Patent ID: 7423360
Filing Date: 2008-09-09
Classification: G01N,H03H

Abstract:
1. A surface acoustic wave device, comprising: a three-dimensional substrate having a surface, which includes at least a part of an annular curved surface formed with a continuous curved surface on which a surface acoustic wave propagates; and an electro-acoustic transducing element, which excites the surface acoustic wave along the surface, which propagates the surface acoustic wave along the surface, and which receives the surface acoustic wave propagating along the surface, wherein the three-dimensional substrate is made of a quartz crystal, and, along the surface of the three-dimensional substrate, the electro-acoustic transducing element propagates the excited surface acoustic wave along a line of intersection between a crystal face of the quartz crystal and the surface thereof, a normal line of the crystal face being a Y axis that is a crystal axis of the quartz crystal, and the line of intersection defined as an outermost circumferential line.