| 摘要 |
PURPOSE:To obtain a speaker having high energy converting efficiency and flat output sound pressure frequency characteristics, by forming an electric signal input terminal of an oscillator on a frame for a piezoelectric speaker consisting of a diaphragm made of a bimorph oscillator and a polymer material film and a frame. CONSTITUTION:The utmost outer circumference part 53c of a diaphragm 53 is adhered with an adhesive to the adhering surface 55a of a frame 55 made of a metal such as brass, etc. The electrode surface of the diaphragm 53 is connected electrically to the frame 55 by means of the surface 55a. Then a piezoelectric electro-acoustic transducer 51 is adhered to the frame 55 so that the frame 55 functions as an electric signal input terminal. A terminal plate 56 connected electrically to the frame 55 and then adhered to the frame is connected with the electrode of piezoelectric ceramics 52a and an electrode 56a of the plate 56 via a lead wire 54. The plate 56 functions as another electric signal input terminal. |
