| 摘要 |
PURPOSE:To remove the deterioration in a peak of a secondary resonance and a secondary resonance frequency and obtain a flat frequency characteristic in a wide band by disposing a characteristic correcting piece formed by laminating nonwoven fabric and a pressure sensitive adhesive in multilayers. CONSTITUTION:By the use of a pressure sensitive adhesive 502, on a central surface surface of a plane diaphragm 1, a characteristic correcting piece 5 formed by laminating nonwoven fabric 501 and the pressure sensitive adhesive 502 in multi-layers is fixed. Herein when the plane diaphragm 1 is driven by a voice coil 3, the characteristic correcting piece 5 simultaneously operates. However, the pressure sensitive adhesive 502 of the characteristic correcting piece 5 absorbs a movement of the nonwoven fabric 501 remote from the plane diaphragm. Thus, a substantial mass addition is reduced by half and the oscillation on the plane diaphragm 1 is absorbed. As mentioned above, by providing the characteristic correcting piece formed by laminating the unwoven fabric and the pressure sensitive adhesive in multi-layres, the deterioration of a secondary resonance frequency is eliminated and a flat and wide reproducing frequency band can be obtained. |
