| 摘要 |
A surface acoustic wave device which occupies a small mounting area and has a low profile, yet having an improved reliability, and can be made available at low cost. The surface acoustic wave device comprises a piezoelectric substrate 1, a function region 2 formed of comb-like electrodes for exciting surface acoustic wave provided on a main surface of the piezoelectric substrate 1, a space formation member 3 covering the function region 2, a plurality of bump electrodes 4 provided on a main surface of the piezoelectric substrate 1 and a terminal electrode 5 provided opposed to the main surface of piezoelectric substrate 1. The bump electrode 4 and the terminal electrode 5 are having a direct electrical connection, and a space between piezoelectric substrate 1 and terminal electrode 5 is filled with resin 6. When the above-configured acoustic wave device is applied for a frequency filter, a resonator, in a portable telephone unit, a keyless entry or the like communication apparatus, the overall size of such apparatus can be reduced and a higher reliability is implemented. <IMAGE> |
