| 摘要 |
<p>A piezoelectric pressure sensor (S) includes a generally elongated sensor housing (10), a pressure receiving plate (16) disposed at a first end of the sensor housing (10) with a first surface thereof (16a) serving as a pressure receiving surface for receiving a pressure applied from outside of the sensor housing (10), a pressure transmission member (17) accommodated in the sensor housing (10) with a first end thereof held in contact with a second surface of the pressure receiving plate (16), and a tubular piezoelectric element (11) accommodated in the sensor housing (10) with a first end thereof held in contact with a second end of the pressure transmission member (17). A pair of electrodes (11a, 11b) are formed on the external and internal surfaces of the piezoelectric element (11), respectively. An external charge detection member (12, 12-1, 12a, 12a-1, 12b) is held in contact with the external electrode (11a) for collecting charge generated by the external electrode (11a) and is encircled by a heat-shrinkable tube (15), while an internal charge detection member (22) is held in contact with the internal electrode (11b) for extracting charge therefrom. A fixing screw (13) is threaded into the sensor housing (10) for holding in a prestressed fashion the piezoelectric element (11) and the pressure transmission member (17) against the pressure receiving plate (16). During assemblage of the pressure sensor (S), the heat-shrinkable tube (15) undergoes a thermal shrinkage upon application of heat thereto, thereby compressing the external charge detection member (12, 12-1, 12a, 12a-1, 12b) radially inwardly against the external electrode (11a). <IMAGE></p> |
