| 摘要 |
PROBLEM TO BE SOLVED: To prevent an adverse effect caused by sticking of adhesive agent by forming a wall so as to prevent the adhesive agent from flowing out and being stuck onto a diaphragm by providing ring-shaped irregularities at the peripheral part of an area to be applied with the adhesive agent for fixing the piezoelectric diaphragm into a housing case. SOLUTION: In a piezoelectric sounding body 20 in structure fixing a peripheral part 16 of a piezoelectric diaphragm 15 fixing a piezoelectric element 1 forming electrodes 3 and 4 on both the sides of a piezoelectric member 2 onto a main face 15a through an adhesive agent 8 to a housing case 9, in the area of the peripheral part 16 to apply the adhesive agent 8, irregularities 17 are provided around in the form of parallel rings from a peripheral terminal to the inner terminal of an adhesive agent applying area X. Thus, the fixing of the piezoelectric diaphragm is strengthened by securing a wider contact areas between the peripheral part 16 of the piezoelectric diaphragm 15 and the adhesive agent 8, the irregularities 17 become the wall for preventing the adhesive agent 8 from flowing out onto the piezoelectric diaphragm, and the adverse influence upon acoustic characteristics are prevented. |
