| 摘要 |
PROBLEM TO BE SOLVED: To obtain an electric energy generation source other than a battery without shielding rear and side visibility. SOLUTION: A reflector 19 is arranged at the front side of a speaker unit 14 having a diaphragm 4, a voice coil 6 coupled to the diaphragm, and a magnetic circuit 9 for providing a static magnetic field to the voice coil. A solar battery 27 is provided at the reflector.
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