| 摘要 |
To keep sounds emitted from a speaker apparatus in high quality. According to one embodiment of the present invention, a top layer and a back layer in a diaphragm of a speaker unit built in a speaker apparatus, and a reinforcement board for reinforcement which is interposed between the top layer and the back layer, and is disposed from the center part of diaphragm to the outer circumference part of diaphragm of the speaker diaphragm are provided. Thereby, unnecessary vibration caused by lack of the rigidity of the diaphragm can be prevented, and a possibility that the reinforcement board comes off or falls off can be remarkably reduced.
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