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JPH01177299

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DESCRIPTION JPH01177299
[0001]
TECHNICAL FIELD The present invention relates to a so-called underwater speaker which emits
sound by sinking in water. 2. Related Art In recent years, underwater sports such as
synchronized swimming and scuba diving have become popular, coupled with the sports and
health industry boom. The underwater speaker which makes a sound underwater is used for
them. Hereinafter, a conventional underwater speaker will be described with reference to the
drawings. FIG. 2 is a cross-sectional view showing a structure of an example of a conventional
underwater speaker. In FIG. 2, the structure 2 is attached to the magnetic circuit 1. Edge 3 is
attached to structure 2. The diaphragm 4 is supported by the edge 3. A voice coil 5 is attached to
the moving plate 4 and can move in the gap of the magnetic circuit 1. 6 is a water pressure
compensating bellows made of a flexible material such as rubber. Reference numeral 7 is a
protective cover for the edge 3 and the diaphragm 4. Reference numeral 8 is a protective cover
for the hydraulic pressure compensation base 6. The operation of the underwater speaker
configured as described above will be described below. The diaphragm 4 vibrates by the driving
force of the voice coil 6 to directly vibrate water. This water's vibration propagates with
underwater sound waves. On the other hand, the protective cover 8 is provided with a small hole
8a for allowing the water to flow, and the water pressure compensating bellows 6 is compressed
upon receiving the water pressure, and the air inside is compressed. The magnetic channel 1 is
provided with a small hole 1a for circulating the air on the back surface of the diaphragm 4 and
the air in the water pressure compensation bellows 6, and the compressed air in the water
pressure compensation bellows 6 is a vibration plate It is transmitted to the back of 4 and is
balanced with the water pressure that the diaphragm 4 receives from the front. For this reason,
the diaphragm 4 can vibrate without being crushed by water pressure. FIG. 3 is a cross-sectional
view showing the structure of another example of the conventional underwater speaker. In FIG.
3, reference numeral 12 denotes a structure attached to the magnetic circuit 11 and also serving
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as a diaphragm. A voice coil 13 is attached to the structure 12 and can move in the gap of the
magnetic circuit 11. 14 is a protective cover. The structure 12 is made of a hard material so as
not to be deformed by water pressure, and vibrates by the driving force of the voice coil 13 to
directly vibrate water. However, the structure as shown in FIG. 2 has a problem that the shape of
the underwater speaker is a hindrance when it is installed in a deep room, a pool or the like. In
addition, the water pressure compensation bellows 6 and the protective cover 8 are expensive
and the structure becomes complicated.
Further, in the structure as shown in FIG. 3, since the structure 12 also serving as the diaphragm
is hard, although the shape of the underwater speaker is not deep, the low frequency can not be
reproduced and the sound quality is poor. Had. SUMMARY OF THE INVENTION In view of the
above problems, the present invention provides an underwater speaker which does not have a
deep shape, is not expensive, has a simple structure, and does not have a deterioration in sound
quality. In order to solve the above problem, the underwater speaker of the present invention is
supported by a magnetic circuit, a structure attached to the front of the magnetic circuit, and an
edge attached to the structure. A diaphragm and a voice coil attached to the diaphragm and
movable in the gap of the magnetic circuit are provided, and a hydraulic pressure compensating
bellows is concentrically provided on the outer peripheral portion of the diaphragm. Operation
The present invention does not have a deep shape because the above-described structure does
not provide the hydraulic pressure compensating bellows on the back surface of the magnetic
circuit. Further, since the diaphragm and the protective cover for the water pressure
compensation bellows can be integrated, the cost can be increased and the structure can be
simplified. Furthermore, since the base for water pressure compensation is provided, it is not
necessary to harden the support by the edge of the diaphragm, and it is possible to reproduce to
a low frequency and not to deteriorate the sound quality. Embodiment An underwater speaker
according to an embodiment of the present invention will be described with reference to the
drawings. FIG. 1 is a cross-sectional view showing the structure of an underwater speaker
according to an embodiment of the present invention. 21 is a magnetic circuit. Reference
numeral 22 denotes a structure attached to the magnetic circuit 21. A diaphragm 24 is
supported by an edge 23 attached to the structure 22. A voice coil 25 attached to the diaphragm
24 and movable in the gap of the magnetic circuit 21 is a water pressure compensating bellows
concentrically provided on the outer periphery of the moving plate and integrated with the edge
23 . The structure 22 is provided with small holes 22'a which allow the air on the back of the
diaphragm 24 and the air on the back of the water pressure compensating bellows 26 to flow.
Reference numeral 27 denotes a protective cover for the diaphragm 24 and the water pressure
compensating bellows 26. A small hole 27a for allowing water to flow is provided on the front
surface of the water pressure compensating bellows 26. 28 is a back protective cover. The
operation of the underwater speaker configured as described above will be described below with
reference to FIG. The diaphragm 24 vibrates by the driving force of the voice coil 25 and vibrates
water directly. This water's vibration propagates underwater).
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On the other hand, the pressure compensating pelose 26 receives the water pressure of the
water flowing through the small holes 22a provided in the protective cover 22 and the air in
compression is compressed. The compressed air is transmitted to the back surface of the
diaphragm 24 through the small holes 22a provided in the structure 22, and is balanced with the
water pressure received from the front surface of the imaging plate 24. Therefore, the diaphragm
24 can be freely photographed and moved without being crushed by water pressure. As
described above, according to the present embodiment, by providing concentrically on the outer
peripheral portion of diaphragm 24 of water pressure compensating bellows 26, it is not
necessary to provide it on the back surface of magnetic circuit 21, and the shape of the
underwater speaker Prevent it from becoming a deep one. Further, since the diaphragm 24 and
the protective cover of the water pressure compensating bellows 26 can be integrated, the cost
can be increased and the structure can be simplified. Furthermore, it is not necessary to provide
the water pressure compensating bellows 26, and it is not necessary to make the support of the
diaphragm 24 by the edge 23 hard, and it is possible to reproduce to a low frequency and to
deteriorate the sound quality. In the present embodiment, although the edge 23 and the water
pressure compensating bellows 26 are integrated, it is needless to say that this may be a separate
piece. Further, in the present embodiment, although the diaphragm 24 and the protective cover
27 for the hydraulic pressure compensating bellows are integrated, it is needless to say that this
may be a separate piece. The front cover 27 may be omitted depending on the material of the
diaphragm 24, the edge 23 and the water pressure compensating bellows 26. As described
above, according to the present invention, a magnetic circuit, a structure attached to the front
surface of the magnetic circuit, a diaphragm supported by an edge attached to the structure, and
a diaphragm attached to the diaphragm The voice coil is movable in the gap of the magnetic
circuit, and the water pressure compensating bellows is concentrically provided on the outer
peripheral portion of the diaphragm so that the shape of the underwater speaker becomes deep.
It is possible to prevent and increase the cost and simplify the structure. Furthermore, it is a very
useful invention without deterioration of sound quality.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing the structure of the underwater speaker according to an
embodiment of the present invention, and FIGS. 2 and 3 are cross-sectional views showing the
structure of a conventional underwater speaker.
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21 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и Diaphragm, 25 ииииии Voice coil, 26 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 protective cover,
27 и и и и и и и provided on the protective cover Small holes in the front of the bellows for water
pressure compensation, 28 и и и и и и и и back protective cover Name of Agent Attorney Nakao Toshio
Other 1 2f-Magnetic Circuit 22----fLtlJ23-Edge
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