| 摘要 |
PURPOSE: To decrease the amt. of the adhesive protruding from the outer periphery of piezoelectric ceramics and to allow the above piezoelectric diaphragm to surely function as a piezoelectric sound producing body by surface working the adhesive surface of a metallic substrate arranged to face the piezoelectric ceramic plate to a recessed shape. CONSTITUTION: The metallic substrate 2 formed by working the one surface of the metallic surfaces to a recessed part with a step and the piezoelectric ceramic plate 1 having the outside diameter smaller than the outside diameter of this recessed part are used and are adhered by the adhesive 3 in the production process of the piezoelectric diaphragm by adhesion. As a result, the smaller amt. of the adhesive 3 at least necessary at the time of tightly adhering the entire surface of the piezoelectric plate 1 and the substrate 2 is necessitated and the amt. of the adhesive 3 protruding from the outer periphery of the ceramic plate 1 of the piezoelectric diaphragm to be produced decreases as well. Then, there is no more trouble at the time of joining lead wires or lead terminals which arises in the case where the protruding size of the adhesive 3 increases and the piezoelectric diaphragm is capable of surely functioning as the piezoelectric sound producing body. |
