Patent ID: 9590170
Date: 2017-03-07
CPC Classifications: H01L,H03H,Y10T

Claim:
1. A method of fabricating an acoustic wave device, the method comprising: bonding an upper surface of a support substrate formed of sapphire to a lower surface of a piezoelectric substrate formed of lithium tantalate, said piezoelectric substrate having an upper surface on which an IDT is to be formed; forming a plurality of modified regions in the support substrate that are aligned along a thickness direction of the support substrate by irradiation of a laser beam, the plurality of modified regions not being formed in the piezoelectric substrate; and cutting the support substrate and the piezoelectric substrate vertically at a location of the plurality of modified regions, wherein a shortest distance from a boundary plane between the upper surface of the support substrate and the lower surface of the piezoelectric substrate to an edge of a closest one of the plurality of modified regions to said boundary plane is greater than or equal to 20 μm and less than 69 μm.