Patent ID: 6848155

Claim:
A method of manufacturing an edge reflection type surface acoustic wave device including a piezoelectric substrate having opposing two end surfaces and at least one IDT provided on the piezoelectric substrate and in which a Shear Horizontal type surface acoustic wave is reflected between the opposing two end surfaces, the method comprising the steps of: preparing a piezoelectric substrate having an upper surface and a lower surface; forming at least one IDT on the upper surface of the piezoelectric substrate; performing a first half cut in order to form opposing two end surfaces defining reflection end surfaces, in which the piezoelectric substrate is half cut from the upper surface of the piezoelectric substrate to a depth not reaching the lower surface of the piezoelectric substrate by using a first blade such that first end surface portions having a smooth surface for defining the reflection end surfaces are formed; performing a second half cut in which, after the first half cut, the piezoelectric substrate is cut to a depth not reaching the lower surface of the piezoelectric substrate by using a second blade so as to form second end surface portions having a rough surface such that said second end surface portions having the rough surface are arranged below the first end surface portions outside of the first end surface portions in the surface acoustic wave propagation direction; and performing a full cut in which the piezoelectric substrate is cut by using a third blade so as to reach the lower surface of the piezoelectric substrate outside of the second end surface portions in the surface acoustic wave propagation direction.