| 摘要 |
PURPOSE:To attain the composite speaker having a broad band characteristic, overlapped with a woofer, low cost and thin thickness, by joining a piezoelectric element forming a tweeter a part of a woofer diaphragm constituting the woofer. CONSTITUTION:A harmonic distortion is decreased with a damper member 52 for attaining the reproduction of speaker with good quality, in forming a piezoelectric element 51 constituting the tweeter as a film and fitting it to a woofer diaphragm 41 via the damper member 52, when the film body as the piezoelectric element 51 is vibrated. The piezoelectric element 51 is adhered to the diaphragm 41 via the damper member 52, positive/negative electric signal input terminals are formed and the diaphragm acts like a condensor type tweeter. Further, the piezoelectric element 51 irradiates sound as the tweeter in a high frequency sound where the impedance is decreased, allowing to form a composite speaker having a broad band being overlapped with the woofer consisting of the diaphragm 41. Since no special magnetic circuit and pole are required, the low cost and the thin thickness are attained. |
