| 摘要 |
PURPOSE:To increase the rigidity in a circumference direction and to suppress the generation of an asymmetric vibration mode with a diaphragm having a crest and a trough part formed radially from a center and a waveform section in the circumference direction, by forming the crest along the circumference part at the outer circumference part. CONSTITUTION:For a form of a core material 4, the crest 4a and the trough 4b are extended radially from the center part of the core 4. The crest and the trough are folded along the circumference at the outermost circumference part to form the trough 4c and the crest 4d to the crest 4a. A plane part 4e is adhered to a skin material 2' which is stuck on a rear surface. In such a way, the rigidity is increased in the circumference direction to suppress the generation of the asymmetric vibration mode for the speaker diaphragm. |
