Surface acoustic wave element, surface acoustic wave device,...

Details Surface acoustic wave element, surface acoustic wave device,... Surface acoustic wave element, surface acoustic wave device,...

2008-04-01

2008-04-01

San Martin, J. (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S363000, C310S364000, C310S366000

Reexamination Certificate

active

07352114

ABSTRACT:
A surface acoustic wave element includes a thin film electrode composed of monocrystal aluminum disposed on a piezoelectric substrate. At least one metal of Cu, Ta, W, and Ti is segregated in the thin film electrode composed of monocrystal aluminum. In this surface acoustic wave element, segregation of Cu or the like occurs in the thin film electrode. Such segregation is effective to reduce the occurrence of cracks on the piezoelectric substrate during ultrasonic wave connection for flip chip mounting. That is, because the occurrence of cracks on the piezoelectric substrate is reduced, tolerance against the ultrasonic vibration is advantageously improved in the surface acoustic wave element.

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