| 摘要 |
Provided is an acoustic device capable of always achieving good acoustic performance in a state in which an acoustically insulated earplug is mounted in the external auditory meatus. The acoustic device (1) has a bone conduction speaker (24) for imparting acoustic vibration to an earplug (21). The earplug (21) has an acoustically insulated flexible earplug body (22) to be inserted into the external auditory meatus, and a cap body (23) of fixed shape established upon an end portion (22a) of the side opposite the insertion side of the earplug body (22). The cap body (23) has a vibrated surface (23a) which comes into contact with a vibration output surface (24a) of the bone conduction speaker (24) to receive vibration. The vibration output surface (24a) is a concave spherical surface, and the vibrated surface (23a) is a convex spherical surface. The radius of curvature R1 of the vibrated surface (23a) is between 2 mm and 10 mm, and the radius of curvature R2 of the vibration output surface (24a) is greater than the radius of curvature R1 of the vibrated surface (23a).
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