| 摘要 |
PROBLEM TO BE SOLVED: To provide a bidirectional radiation type speaker system or the like capable of preventing generation of abnormal sounds and reducing the number of components. SOLUTION: In a speaker unit, a magnetic gap having a magnetic field of the same size in each of vibrating systems is formed from a magnet holder, a magnet, a yoke and the like. The direction of winding a voice coil around a voice coil bobbin is inverted for one vibrating system and another vibrating system. Therefore, sonic waves are radiated in a reverse direction. At such a time, vibration incurred in a magnetic circuit system with vibration of one diaphragm by a reaction thereof and vibration incurred in the relevant magnetic circuit system with vibration of another diaphragm by a reaction thereof are canceled and occurrence of vibration in the magnetic circuit system can be suppressed, so that abnormal sounds can be prevented from being radiated through a case or a speaker box. Moreover, the speaker unit is comprised of one magnetic circuit or the like comprising two magnetic gaps, so that the number of components can be reduced. COPYRIGHT: (C)2006,JPO&NCIPI
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