Porcelain acoustic device for smartphone

摘要

To provide a porcelain acoustic device for a smartphone that it is possible to listen to the amplified sound in the whole circumference of the [object of the present apparatus. The speaker portion 20A having a A lower body 10A and the upper body 20A sound and loud sound space top is formed in the gap-like ring that has been open to the circular, are sound conducting from the echo-loudspeaker unit 10A the echo-amplified sound was allowed to further echo-loudspeaker, characterized in that it is configured to emit in all directions of the external.FIELD 1