| 摘要 |
PROBLEM TO BE SOLVED: To enhance driving efficiency more in a speaker of small distortion. SOLUTION: On the side closer to a magnetic circuit 1 than a vibration cone 3, a damper 10 having an inner circumferential end connected with a voice coil body 2 and an outer circumferential end connected with a frame 5 through a second edge 11 is provided. The second edge 11 projects to the vibration cone 3 side or the opposite side thereof, and the damper 10 has such a structure as a first protrusion 10a protruding toward the vibration cone 3 side and a second protrusion 10b protruding in the direction opposite to that of the first protrusion 10a are repeated alternately a plurality of times. Number of the first protrusions 10a is differentiated from that of the second protrusions 10b, and the damper 10 is connected with the second edge 11 on the side closer to the protrusion 10b of smaller number of times of protrusion, out of the first and second protrusions 10a and 10b, than the center line A between the first and second protrusions 10a and 10b. COPYRIGHT: (C)2007,JPO&INPIT
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