| 摘要 |
PURPOSE:To improve the amplitude of vibration of a diaphragm and also to prevent the vibration from the diaphragm from being delivered to a side plate by bending the ridge circumference part of the diaphragm and also forming a boundary part with the side plate as a pin corner. CONSTITUTION:The ridge circumferential part of the diaphragm 1a is curved and constitutes a case 1 together with a cylindrical side plate 1b having a diameter t2 smaller than the maximum diameter t1 of the diaphragm 1a. Further, the boundary 6 between the diaphragm 1a and the side plate 1b is formed as a pin corner. A piezoelectric element 2 is fitted in the inside face of the diaphragm 1a, a prescribed electric signal is impressed to the piezoelectric element 2 via terminals 4 and 4' and an electric signal is led out from the piezoelectric signal. |
