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JPH05260584

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DESCRIPTION JPH05260584
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transducer for converting electrical energy and acoustic energy used in a sonar or the like. In
particular, it relates to a transducer that performs low frequency electro-acoustic conversion.
[0002]
2. Description of the Related Art In a conventional transducer of this type, a disk-shaped ceramic
vibrator 12 is attached to one side of a disk-shaped diaphragm 11 made of an elastic material
such as metal as shown in FIG. By applying an alternating voltage to the ceramic vibrator 12 and
vibrating it in the radial direction, as shown in FIG. 8, a unimorph vibrator is used which bends
the diaphragm 11 to generate vibration.
[0003]
In order to configure this unimorph type transducer as a transducer, as shown in FIG. 9, the
transducer faces of the two ceramic transducers 12 face each other and are attached to the
watertight casing 13 through the O ring 14. It was
[0004]
When a transducer using such a conventional unimorph transducer is put into deep water and
used, as shown in FIG. Since 11 deforms so as to bend inward, a tensile stress is generated in the
ceramic vibrator 12 and there is a problem that the ceramic vibrator 12 is broken.
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[0005]
In addition, when the input power to the ceramic vibrator 12 is increased to generate a large
acoustic output, there is a defect that a crack is generated due to internal stress generated in the
ceramic vibrator 12 due to the vibration of the unimorph vibrator itself. The
[0006]
The present invention solves such a problem, and an object of the present invention is to provide
a transducer capable of generating a large acoustic output without breaking by hydrostatic
pressure in deep water.
[0007]
According to the present invention, there is provided a transmitter / receiver comprising two
disc-shaped diaphragms and a ceramic vibrator which receives the vibration of the diaphragm,
wherein the ceramic vibrator is the two vibrators. It is characterized in that it is formed in a ring
shape sandwiched between the diaphragms of a sheet.
[0008]
A split ring having a groove in the center of the outer periphery can be provided on the outer
periphery of the ceramic vibrator, and high tension fibers can be wound around the groove.
[0009]
[Function] A circular counterbore is provided on the two diaphragms, and a ring-shaped ceramic
vibrator is interposed in the counterbore, so that hydrostatic pressure is applied to deform the
diaphragm. Also, the deformation does not affect the ceramic vibrator.
Therefore, it can prevent from water pressure failure.
Furthermore, since a pressing force is applied to the ceramic vibrator by the outer periphery of
the counterbore of the two diaphragms, generation of vibration in the ceramic vibrator itself can
be prevented.
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[0010]
Thereby, a large sound output can be generated without being destroyed even in deep water.
[0011]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present
invention will be described based on the drawings.
FIG. 1 (a) is a cross-sectional view showing a basic configuration of a vibrator according to an
embodiment of the present invention, and FIG. 1 (b) is a perspective view thereof.
[0012]
In the vibrator according to the embodiment of the present invention, basically, the central
portion of the diaphragm 1 made of an elastic body such as metal is seated in a circular shape,
and the ring-shaped ceramic vibrator 2 is fitted in the counterbore. Is configured.
[0013]
In the assembly of this vibrator, first, the diaphragm 1 is heated and expanded to fit the ceramic
vibrator 2 and the compressive force is applied to the ceramic vibrator 2 by the contraction force
of the diaphragm 1 generated when the temperature is lowered. Do.
When a transducer is configured using this vibrator, the fitting surfaces of the ceramic vibrators
2 of the two vibrators are facing inward and attached to the watertight housing.
[0014]
FIG. 2 is a view for explaining the operating state of the vibrator according to the embodiment of
the present invention thus configured.
As described above, by causing so-called respiratory vibration in which the ceramic vibrator 2
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expands and contracts in the radial direction, the diaphragm 1 is bent to generate vibration.
[0015]
Here, an embodiment of the present invention using a vibrator having such a basic configuration
will be described.
[0016]
FIG. 3 is a sectional view showing the structure of the first embodiment of the present invention.
[0017]
In the first embodiment of the present invention, a circular counterbore is provided on the two
diaphragms 1a, a groove for accommodating the O-ring 4 is provided on the outer periphery
thereof, and the ceramic vibrator 2a is provided in the counterbore. The ring-shaped ceramic
vibrator 2 a is formed in a ring shape, and is held by two diaphragms 1 a, and is installed in the
cylindrical water-tight casing 3 via an O-ring 4.
[0018]
As described above, by making the ceramic vibrator 2a of the vibrating body into one common
ceramic vibrator, the two diaphragms 1a can be coupled via the one ceramic vibrator 2a, and
hence a strong structure can be obtained. can do.
Further, when this transducer is inserted into deep water for use, the diaphragm 1a is deformed
by the hydrostatic pressure indicated by the arrows as shown in FIG. 4, but no tensile stress is
generated in the ceramic vibrator 2a.
[0019]
Generally, the fracture stress of the ceramic material is about 2000 kg / cm 2 in tension and
about 5000 kg / cm 2 in compression, so the ceramic vibrator 2 a will not be broken until it is
buckled by compressive force.
[0020]
Further, even when the input power is increased, the compressive force is applied as a bias force
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in the radial direction of the ceramic vibrator, so the generated force due to the vibration exceeds
the stress obtained by adding the bias force and the tensile strength of the ceramic material. It is
possible to generate a large sound output without
[0021]
FIG. 5 is a cross-sectional view showing the configuration of the second embodiment of the
present invention, and FIG. 6 is a perspective view showing the configuration of the vibrator in
the second embodiment of the present invention.
[0022]
In the second embodiment of the present invention, a split ring 5 having a groove in the center of
the outer periphery is interposed between a ceramic vibrator 2b and two diaphragms 1a, and
high tension fiber 6 is wound and fixed in the groove. The split ring 5 is installed and held in the
counterbore portion of the two diaphragms 1a.
[0023]
That is, as shown in FIG. 6, a dividing ring 5 made of an elastic material such as metal is attached
around the ring-shaped ceramic vibrator 2a, and a glass fiber is provided in a groove 5a provided
on the circumference of the dividing ring 5. The high tension fiber 6 such as carbon fiber is
wound in a tensioned state, and a strong compressive force is applied as a bias force in the radial
direction of the ceramic vibrator 2a.
Even if a large acoustic output is generated by this compression force, the ceramic vibrator 2a
can be prevented from being broken.
[0024]
As described above, according to the present invention, a circular counterbore is provided on a
diaphragm made of an elastic material such as metal, and a ring-shaped ceramic vibrator is fitted
to this to form a vibrator. By configuring, it is possible to prevent tensile stress due to application
of hydrostatic pressure from being generated in the ceramic vibrator, and it can withstand use in
deep water, and furthermore, compressive force is biased in the radial direction of the ceramic
vibrator. Since it is applied as a force, there is an effect that a large acoustic output can be
generated without destroying the ceramic vibrator.
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