| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a whole-surface driven speaker capable of preventing deterioration in acoustic quality and generating a practical sound pressure level at the same time, as well as having design flexibility for the front surface shape. <P>SOLUTION: A whole-surface driven speaker comprises: a first and a second magnetic circuit groups in which magnetic circuits MC1, MC2 having cylindrical magnetic gaps are arranged in each direction at an equal interval to each other and in which magnetic gaps are arranged close to and opposing to each other; and a diaphragm 21 disposed on neutral surfaces between these magnetic circuits, a voice coil VC being arranged on the diaphragm 21. Each magnetic circuit MC1, MC2 of the first and the second magnetic circuit groups are arranged facing to each other in every direction each shifted at half a pitch. The voice coil VC is formed along a line continuously continued in a unicursal manner without crossing the arc of the outer periphery of fan-shaped regions corresponding to adjacent 90 degrees or 180 degrees of any of magnetic gaps which are arranged close to and opposing to each other in the first and the second magnetic circuit groups. <P>COPYRIGHT: (C)2013,JPO&INPIT |
