| 摘要 |
PURPOSE:To inexpensively mass-produce a piezoelectric electroacoustic transduc er which is small in size, light in weight, high in reliability, and good in manufac turing yield with high performance having constant quality, by forming an enclosure and sound producing and receiving element of the same material integrally. CONSTITUTION:A piezoelectric plate 11 for sound production or sound reception, electrodes 12 and 12', elastic plate 13, and box body 15 are united integrally and the parts except the electrodes 12 and 12' are constituted of a piezoelectric ceramic material. At the time of sound production, AC electric signals are inputted to electrode terminals 14 and 14' and the piezoelectric plate 11 put between the electrodes 12 and 12' tends to extend and shrink in the lateral direction due to a piezoelectric effect. Since the piezoelectric plate 11 is joined to the piezoelectric inert elastic plate 13 integrally, the piezoelectric plate, electrodes 12 and 12', and elastic plate 13 are deformed by bending upward or downward integrally. Thus input electric signals are converted into acoustic energy and sounds are transmitted to the outside through through-holes 16 provided in the upper part of the enclosure 15. |
