| 摘要 |
In a diaphragm for a speaker, a main body part vibrating at a time of driving of a speaker device includes not only a first layer made of a woven fabric and a third layer made of paper, but also a second layer made of metal. The second layer made of the metal, serving as a reinforcement member of the diaphragm, is partly provided within a predetermined range on an inner circumferential side of the main body part. Namely, only the predetermined range on the inner circumferential side has a triple-layer structure having the second layer. Thereby, an inner peripheral part displaced with large amplitude due to large force applied at the time of the driving of the speaker can be effectively reinforced. By reinforcing the inner peripheral part by the metal, strength of the speaker device can be ensured, and sound quality can be improved.
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