Patent ID: 6367133
Filing Date: 2002-04-09
Classification: H03H,Y10T

Abstract:
A method of manufacturing a surface acoustic wave apparatus including first and second surface acoustic wave devices having interdigital transducers with different thicknesses from each other on a single piezoelectric substrate, the method comprising the steps of:providing a piezoelectric substrate; forming a first conductive film on the entire surface of the piezoelectric substrate; depositing a first resist on the entire surface of the first conductive film and patterning the first resist; dry-etching the first conductive film using the patterned first resist to form on the piezoelectric substrate IDT electrodes of a first surface acoustic wave device, a short-circuit wiring electrode for establishing electrical connection between comb-shaped electrodes of the IDT electrodes, and a conductive film provided in a region including the entire area in which the second surface acoustic wave device is constructed; removing the conductive film in the region including the entire area in which the second surface acoustic wave device is constructed; depositing a second resist on the entire surface of the piezoelectric substrate and heating the second resist; patterning the second resist at a portion in which the electrodes of the second surface acoustic wave device are formed; forming on the entire surface of the piezoelectric substrate, a second conductive film having a thickness which is different from that of the first conductive film and having substantially the same film thickness as the electrode film thickness of the second surface acoustic wave device; removing the second resist by a lift-off method to form the electrodes of the second surface acoustic wave device and to expose the electrodes of the first surface acoustic wave device; and disconnecting the short-circuit wiring electrode in the first surface acoustic wave device.