摘要 |
Odd-numbered piezoelectric sheets <HIL><PDAT>22, 21</BOLD><HIL><PDAT>b, </ITALIC><HIL><PDAT>21</BOLD><HIL><PDAT>d, </ITALIC><PDAT>and <HIL><PDAT>21</BOLD><HIL><PDAT>f </ITALIC><PDAT>are formed with a plurality of individual electrodes <HIL><PDAT>24</BOLD><PDAT>. Even-numbered piezoelectric sheets <HIL><PDAT>21</BOLD><HIL><PDAT>a, </ITALIC><HIL><PDAT>21</BOLD><HIL><PDAT>c, </ITALIC><HIL><PDAT>21</BOLD><HIL><PDAT>e, </ITALIC><PDAT>and <HIL><PDAT>21</BOLD><HIL><PDAT>g </ITALIC><PDAT>are formed with a common electrode <HIL><PDAT>25</BOLD><PDAT>. These odd-numbered and even-numbered piezoelectric sheets are alternatively arranged one on the other to form a laminated body. A top sheet <HIL><PDAT>23 </BOLD><PDAT>is mounted on the laminated body. Surface electrodes <HIL><PDAT>30, 31 </BOLD><PDAT>are formed on the top sheet <HIL><PDAT>23</BOLD><PDAT>. Through holes <HIL><PDAT>32, 33 </BOLD><PDAT>are opened to the piezoelectric sheets <HIL><PDAT>21</BOLD><HIL><PDAT>a </ITALIC><PDAT>through <HIL><PDAT>21</BOLD><HIL><PDAT>g </ITALIC><PDAT>for providing electrical connection of the individual electrodes <HIL><PDAT>24 </BOLD><PDAT>and the common electrodes <HIL><PDAT>25</BOLD><PDAT>, but not to the piezoelectric sheet <HIL><PDAT>22 </BOLD><PDAT>that is laminated on a cavity plate <HIL><PDAT>10. </BOLD></PTEXT>
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