Patent ID: 8689416

Claim:
A method for manufacturing a surface acoustic wave element, comprising: a first step of bonding to a first principal surface of a piezoelectric substrate, a support member having a linear expansion coefficient lower than a linear expansion coefficient of the piezoelectric substrate to form a composite substrate; a second step of forming a plurality of grooves in the support member of the composite substrate from a surface opposite to a bonding interface between the support member and the piezoelectric substrate; a third step of forming electrode patterns including at least one IDT electrode on a second principal surface of the piezoelectric substrate of the composite substrate; and a fourth step of dividing the composite substrate on which the electrode patterns are formed to form individual surface acoustic wave elements; wherein in the second step, the plurality of grooves are formed in the support member so as to be located at boundaries between the individual surface acoustic wave elements at which the individual surface acoustic wave elements are formed by dividing the composite substrate in the fourth step.