| 摘要 |
PURPOSE:To attain small sized and light weight piezoelectric speaker without decreasing the area of the diaphragm, by containing a square diaphragm having folded section in a square frame and connecting a piezoelectric element to the folded section of the diaphragm. CONSTITUTION:A shallow groove is formed at the center of the square frame 10 having an extended bottom 11 and an extended rising piece 12 made of a plastic material, and a soft and flexible substance 20 having a circular or a semi-circular notch 21 is bonded to the groove. Plural piezoelectric element 30 are arranged on the substance 20, and the folded sectioin 41 of the square diaphragm 40 is bonded to a projection 31 of the elements 30 arranged on a line. Both opposing sides of the square diaphragm 40 are linked to the piece 12 of the square frame 10. Then, the piezoelectric speaker is made small in size and light in weight without reducing the area of the diaphragm 40. |
