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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing the structure of
an electro-acoustic transducer of the present invention. 1 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и diaphragm, 5 и и и и screw , 6 ... ... fulcrum. I и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и. 10
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Cables.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electroacoustic
transducers, and more particularly to an underwater transducer for use in underwater
communications. The sound wave in water is a compressional wave that uses water as a medium
as the sound wave in air, and its propagation speed is almost iso at N temperature. ??????
? However, in water, the wavelength of the sound wave is about j times as large as that in air,
and the impedance is about 104 times that of air. Therefore, the design of the transducer used in
the air can not be applied as it is to the transducer used in underwater communication.
Heretofore, various types of this type of transducer have been developed and developed as 41
and Bear, 9k (on the way, for example-as described in Japanese Patent Publication No. 3- / r33g
as an example) for use in concentrated media There is an electrical sound pressure transducer.
This transducer divides an elongated sealed outer jacket into ?, and stores ?lE # in 10,000, and
stores an electric sound lIl conversion element in the other, in this case, between this conversion
element and the closed container. It is intercalated with a rich medium such as oil. Therefore, the
1 M force by the diaphragm of the conversion element is transmitted to the container through
the rich medium to bet the container, and this vibration is propagated into water as a sound
wave. Because of this, the vibration of the converted confectionery diaphragm is attenuated by
the concentration until reaching the customer's container, as a result of which the sound clarity
and Marudai m in the 3 waves in the water are significantly reduced and only a few actually
There is a drawback that can only be Yator. It is an object of the present invention to provide an
electro-acoustic transducer appropriately arranged and arranged to eliminate the above-
mentioned drawbacks and to improve the brightness of sound waves in water and to significantly
increase the reach of sound waves . The electro-acoustic transducer according to the present
invention is characterized in that the ? diaphragm of the electro-acoustic transducer is directly
fixed to a watertight jacket which is significantly lighter than the weight of the transducer so that
the jacket acts as a diaphragm. Do. The invention will be described with reference to the
drawings. As shown in the drawings, an underwater transducer which is an electro-acoustic
transducer according to the present invention comprises an electro-acoustic field transducer 1
and a shell. The transducer element / fixes the diaphragm l to the element fixing base 3 with the
screw j, and the pole piece 7 is attached to the diaphragm l via the fulcrum t, and the magnet for
the pole piece 7! And, the yoke 9 is screwed by a screw 10, and further, two coils // whole
winding is formed on the yoke 9, thereby forming an interval wR / 2 between the diaphragm da
and the yoke de. In addition, it is connected to a current source (without-) via coil // core cable /
The magnetoacoustic transducer 1 configured as described above ultrasonically welds the fixing
base 3 to the center inside one of the main surfaces of the outer shell. In the present invention,
the outer shell 2 is formed into a circular so-called pancake shape and attached with the
conversion element 1 and then sealed by ultrasonic welding to form a water resistant structure.
As described above, in the electro-acoustic transducer of the present invention, when the voice
radio wave is made to flow through the cable 3 to the two fills //, this causes the yoke 9 to
vibrate due to the suction repulsion with the diaphragm, and hence The yoke 9, the magnet 1
and the coil // are vibrated, as a result of which the diaphragm is vibrated by relative VC, thereby
vibrating the housing 2 according to the law of inertia and finally transmitting this vibration as a
sound wave in water. Let As described above, in the present invention, the weight of the
electroacoustic transducer 1 is set to be higher than that of the shell 2 to enable inertial control.
Furthermore, in the present invention, the electroacoustic transducer / IM moving plate is fixed
to the fixing base 3 and the fixing base 3 is inner layer to the center product of the outer jacket 2
and this outer v2 is finally 1 The diaphragm of the air volume w conversion element 1 (the cone
of a normal dynamic coil speaker) is configured. Therefore, when the electroacoustic transducer
1 is driven, the shell 2 can be directly vibrated to propagate the sound 411 wave in water. At this
time, as described above, the electroacoustic transducer! Because the weight of the shell is
extremely heavy compared to the weight of the shell, the shell 2 is used as a good & vibration
plate for the electroacoustic transducer l-this invention transmits and receives the electroacoustic
transducer of the present invention in water When used as a vessel, the butterfly could clearly
hear sound waves over a range of 70 meters and 100 meters in normal conversation. When this
is intended to use the electro-acoustic transducer of the present invention, the diper can extend
its range of motion significantly.
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