| 摘要 |
PURPOSE:To save manufacturing cost with a simple manufacturing method and to obtain a flat sound pressure chracteristic in a listening sense. CONSTITUTION:Four triangle notches 17 are formed to a barrel 10 to divide the barrel into four sectorial barrel pieces 11, they are set to a metallic die and the cone shape of the barrel 10 is formed at the same time when an edge 12 is injection-molded. Furthermore, each of the divided barrel pieces 11 is connected by the edge member with a large internal loss. Moreover, a film 10A is stuck to the barrel 10 to enhance water-proof effect. The forming of the barrel 10 before being set to the metallic die is not required and the process of manufacture is simplified. The resonance sharpness having been produced conventionally is decreased and crests and troughs in the sound pressure characteristic are smoothed, then a flat sound pressure characteristic in a listening sense is obtained and the characteristic of a speaker is easily controlled. |
