| 摘要 |
PURPOSE:To perform a piezoelectric electroacoustic conversion of good acoustic- frequency characteristic with a simple structure by soldering one of input/output terminals, which are fixed to a case, to an electrode on the surface of a piezoelectric body through a thin piece-shaped lead wire. CONSTITUTION:A ceramic piezoelectric body 14 and a metallic diaphragm 15 are joined close to constitute an oscillator. A rear air chamber is constituted with this oscillator and a rear air chamber plate 16, and a sound leaking hole 17 and input/output terminals 18 and 19 are provided. A thin piece-shaped lead wire 23 is soldered to a position 24 of one electrode surface of the piezoelectric body 14, and a part 25 of the terminal 18 is soldered to the rear air chamber plate 16 together with the lead wire 23 by a projection 26 provided on a part of a front air chamber plate 20. A part 27 of the terminal 19 is soldered together with a part of the diaphragms 15. Thus, the soldering work is simplified very much, and the acoustic pressure frequency characteristic is improved. |
