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FIELD OF THE INVENTION The present invention relates to an underwater speaker for use in
seawater. (Conventional art and its problems) In the past, six independent vibrators have been
used as transmitters and receivers of super M waves of A-frequency as transducers used in
water. However, recently the speech cycle 'tLv1. Although the need for transducers that use
bands is increasing, there are many problems, such as sound pressure levels and measures
against water pressure when using conventional speakers. (Means for Solving the Problems) The
present invention has been proposed to solve the above problems, and its object is to provide an
underwater speaker using seawater as a direct vibration source. is there. That is, in order to
achieve the above object, the present invention is composed of a magnetic circuit having a gap
and an electrode for flowing 'R flow through seawater or a conductive fluid in a direction
orthogonal to the magnetic field formed by the magnetic circuit. An underwater speaker
characterized by the above is a gist. (Operation) The present invention is an underwater speaker
that utilizes seawater as a conductor, flows an electric current for forming an audio signal or a
magnetic field, and operates with the seawater itself as an imaging and movement source.
(Embodiment) The figure is a view for explaining an embodiment of the present invention. In the
figure, 1 is a permanent magnet, 2 is a yoke and 3 is a plate to form a magnetic circuit 4, the
plate 3.3 faces to form a magnetic gap 5, and electrodes 6.7 are provided at both ends of the
magnetic gap 5. It is an arrangement. The magnetic circuit 4 and the electrodes 6 and 7 are fixed
in a relative relationship by a frame (not shown). In addition, the electrode 6.7 is configured to be
able to supply current through a lead wire not shown. Each time the speaker is immersed in the
water or in the electrically conductive fluid to generate sound waves in the water in the operation
described below. A magnetic circuit * B is formed by the magnetic circuit 4 in sea water, and a
pair of electrodes 6 ° 7 are disposed in a direction perpendicular to the magnetic field B.
Current or voice in the pair of electrodes 6.7 of the mouth? An audio signal is applied so that the
tf stream flows. The space between the electrodes 6 and 7 is filled with seawater or a conductive
fluid, and the medium causes a current 1 to flow by ion conduction. Then, according to the lefthand rule of framing ... water flow F is generated in the direction perpendicular to both ffB and
current i, the direction of water flow F is changed according to the frequency of the audio signal,
and compression waves of water are obtained. Sound waves can be emitted. In other words, it is
possible to realize an underwater speaker that directly drives seawater or conductive fluid to
emit sound waves.
Since the underwater speaker according to the present invention does not have a mechanical
resonance system, an ideal underwater speaker can be realized without the presence of the bass
resonance frequency fo and without the frequency limit at high sound. Furthermore, in the
underwater speaker of the present invention, a good underwater speaker can be obtained by
controlling the flow path of the current 1, forming an action rod of compression wave of water
flow, or providing a horn. In the above description, although an audio signal is transmitted
between the electrodes, a direct current may be applied between the electrodes, and an
electromagnet may be used instead of a permanent magnet to change the magnetic field
according to the audio signal. It is clear that an underwater speaker can be obtained. (Effects of
the Invention) As described above, according to the present invention, the magnetic circuit
having the gap and the electrode for passing the current through the seawater or the conductive
fluid in the direction orthogonal to the magnetic field formed by the magnetic circuit. As a result,
it is possible to provide an underwater speaker which is strong against water pressure and has a
good frequency characteristic with a simple structure.
Brief description of the drawings
The figure is a figure for demonstrating one Example of this invention.
1 · · · Permanent magnet, 2 · · · Yoke, 3 · · · Play 1-54 · · · Magnetic circuit, 5 · · · Gap, 6, 7 · · ·
Electrode, B · · · · · Magnetic field, i · · · Current, F · · · Water and 1 other person
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