| 摘要 |
An earth electrode is formed on a first major surface of a piezoelectric substrate, so as to be opposed to both of first and second excitation electrodes which are formed on a second major surface of the piezoelectric substrate. An earth terminal electrode, which is connected to the earth electrode is prevented from overlapping with a lead line which connects the first excitation electrode with a terminal electrode. An electric insulating film is formed in a position opposed to the lead line. Accordingly, if a conductive adhesive, which is employed for connecting the earth terminal electrode to another electrode, spreads beyond the earth terminal electrode, the lead line is not overlapped with the earth terminal electrode or the conductive adhesive through the piezoelectric substrate. In consequence, it is possible to prevent undesirable vibration of piezoelectric substrate in portions other than between the excitation electrodes and the earth electrode. Thus, it is possible to improve a demodulation distortion factor characteristic in a discriminator, for example.
|
