Patent ID: 8686622
Filing Date: 2014-04-01
Classification: H01L,H03H,Y10T

Abstract:
1. A composite substrate for a plurality of electronic devices comprising: a support substrate; a piezoelectric substrate; and an adhesive layer with which the support substrate and the piezoelectric substrate are bonded to each other, wherein, assuming that a surface of the piezoelectric substrate that is bonded to the support substrate is defined as a first surface and a surface at the side opposite to the first surface is defined as a second surface, the piezoelectric substrate has a bulging portion that is formed such that the first surface is inside the second surface when the first surface is projected onto the second surface in a direction perpendicular to the second surface, and wherein the composite substrate has a circular shape with a single flat portion and an outer peripheral surface that continuously extends from the piezoelectric substrate to the support substrate through the adhesive layer.