| 摘要 |
PROBLEM TO BE SOLVED: To eliminate restriction of frequency band based on properties of a vibration plate and to eliminate deterioration of a part supporting the vibration plate in a speaker to the underwater contg. ions. SOLUTION: The titled apparatus comprises an electrode A 1, an electrode B 4, a magnet A 5, a magnet B 3 and sea water and electric current generated by movement of ions in water by the electric field based on the electrode A 1 and the electrode B 4 is influenced by the magnetic field based on the magnet A 5 and the magnet B 3 and a force is applied on water contg. ions filled in a pipe-like hole 2 based on the Fleming's left hand raw to vibrate it.
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