| 摘要 |
<P>PROBLEM TO BE SOLVED: To realize mutual changing between an accommodated state and an expanded state with a simpler structure. <P>SOLUTION: A sound-reproducing apparatus includes plural coupling portions, plural rods, plural shell portions, an actuator, and first, second, and third speakers. Assuming a first regular tetrahedron and a second regular tetrahedron which is in a duality relation with the first regular tetrahedron, the plural coupling portions are disposed at positions corresponding to vertices of the first regular tetrahedron and the second regular tetrahedron. The plural rods connect adjacent coupling portions with each other among the plural coupling portions. The plural shell portions are respectively joined to the plural rods. The actuator is disposed outside one coupling portion selected from the plural coupling portions with respect to the center of the first regular tetrahedron or the center of the second regular tetrahedron, and the actuator is connected with the one coupling portion. The first, second, and third speakers are disposed respectively on three coupling portions excluding the one coupling portion. <P>COPYRIGHT: (C)2013,JPO&INPIT |
