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JPS63261984

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DESCRIPTION JPS63261984
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of an ultrasonic transducer used in water. [Prior Art] FIG. 2 is a cross-sectional view
showing the internal structure of a conventional underwater ultrasonic transducer, in which 1 is
a vibrator, which is a disk-shaped piezoelectric ceramic 2, and Metal blocks 3a and 3b joined to
both end faces of the piezoelectric ceramic 2 are constructed. A sound insulation material 4 such
as a sponge is covered by the sound insulation material 4 except for one end surface of the
vibrator 1 to make the one end surface removed as an acoustic emission surface or incident
surface 1a. Alternatively, sound is emitted or incident only from the incident surface 1a, and the
other part covered with the sound insulating material 4 isolates the sound. A cable 5 is connected
to the piezoelectric ceramic 2 through a sound insulation 4 to input and output electrical signals.
6 is a molding material such as rubber, which covers the acoustic radiation surface or incident
surface 1a and the entire sound insulation material 4 by the molding material 6 and covers one
end of the cable 5 to be integrally molded so that it can be used underwater A watertight
ultrasonic transducer having a watertight structure is formed. The above-described ultrasonic
transducer is installed in the deep sea or the like, and transmission and reception are performed
on the acoustic radiation surface or incident surface 1a, thereby measuring the position of an
object or the like existing in the water. [Problems to be Solved by the Invention] However,
according to the prior art, when the ultrasonic transducer is used in water, when the ultrasonic
transducer is installed in an environment affected by a deep water depth and a high water
pressure, Since the sound insulation material covering the whole circumference except the
acoustic radiation surface or incident surface is formed of sponge etc., the sound insulation
material is pressed by water pressure, the effect as the sound insulation material decreases, and
the sound insulation material is covered Sound is emitted or incident from the surroundings as
well, and becomes an acoustic radiation surface or incident surface, causing disturbances in the
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transmission / reception sensitivity frequency characteristics and directivity originally possessed
by this bundle, and reliance on measurement results There is a problem of lack of sex. Therefore,
the present invention has been made to solve the above-mentioned problems, and even when
used under high water pressure such as deep sea, it is a highly reliable measurement result
without disturbance in the transmission / reception sensitivity frequency characteristic and
directivity. It is an object of the present invention to provide an ultrasonic transducer capable of
obtaining [Means for Solving the Problems] In order to achieve the above-mentioned object, the
present invention provides a support fitting at a position between the piezoelectric ceramic and
the metal block, which should be a node of vibration of the vibrator. The vibrator is fixed in the
body to maintain the water pressure resistance of the housing, and a metal ring joins the acoustic
emission surface or incident surface to the end face of the housing, and this joint portion
includes the acoustic emission surface or the entire incident surface. The casing is made
watertight by covering it with rubber or the like and molding it.
[Operation] The ultrasonic ultrasonic transducer according to the above-described construction is
installed under high water pressure such as deep sea, and an electrical signal is input to or
output from the piezoelectric ceramic in the housing through a cable. In this way, transmission
and reception are performed on the acoustic radiation surface or incident surface of the vibrator
to measure the position of an object or the like existing in water. For this reason, even if the
underwater ultrasonic transducer is used under high yQ7, it has a water pressure resistant
structure, and therefore it is not affected by the water pressure by the vibrator, so the
transmission and reception sensitivity is disturbed in frequency characteristics and directivity.
Therefore, reliable measurement results can be obtained. Embodiments of the present invention
will be described below with reference to the drawings. FIG. 1 is a view showing the internal
structure of an embodiment of the ultrasonic transducer according to the present invention, in
which 7 is a housing whose one end is open and a stepped portion 7a is formed at the center of
the ridge. A mounting hole is formed at the other end for attaching a cable described later. The
piezoelectric ceramic 8 is provided with metal blocks 9a and 9b bonded to both end faces of the
piezoelectric ceramic 8, and one end face of one of the two metal blocks 9a and 9b is an acoustic
radiation surface or incident surface The vibrator 10 is configured as 10a, but in the present
embodiment, the support fitting 11 is attached at a position that becomes a vibration node of the
vibrator 10 between the piezoelectric ceramic 8 and the metal block 9a. The vibrator 10 having
such a configuration is inserted and installed in the housing 7. The support fitting 11 is provided
with a protrusion 11B at the peripheral edge of the flange shape, and the vibrator 10 is fixed and
supported on the step 7a in the housing 7 by the protrusion 11a. Oh! ll Rod T can maintain water
pressure resistance. A metal ring 12 is an end face of the vibrator 10 located in the vicinity of the
opening of the metal ring equipped x-ray rod body 7, an annular groove formed on an acoustic
radiation surface or incident surface 1Oa, and the above-mentioned housing The step portion
formed on the entire circumference of the end face on the opening side of T is connected and
fixed, and is covered with a mold material 13 such as an acoustic radiation surface including this
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connection portion or a t-comb on the incident surface 10a. The interior of the housing 7 is made
watertight. Reference numeral 14 denotes a cable, which is inserted into the body 7 through a
mounting hole provided at the other end of the casing 7 and connected to the piezoelectric
ceramic 8 to input and output electric signals from a power supply (not shown) It has become. As
described above, in the housing γ, the portion other than the acoustic radiation surface or the
incident surface 10a of the vibrator 1o is covered with air, and this air serves as a sound
insulation material of the other portion of the vibrator 1o.
According to the above-described configuration, the inside of the housing 7 maintains a
watertight structure, so that the air acts as a sound insulating material, and the acoustic radiation
of one end face of the vibrator 10 still radiates or enters only on the incident surface 10a. It
becomes. [Effects of the Invention] As described above, according to the present invention, a
support fitting is provided at a position which becomes a node of vibration of the vibrator, and
the support fitting fixes the vibrator in the housing and the sound emitting surface is By
connecting to the end face of the body through a metal ring and covering the acoustic radiation
surface or incident surface including this junction part, the vibrator is covered with air by
covering parts other than the acoustic radiation surface or incident surface. The sound insulation
was done, and the inside of the case was made watertight and watertight. As a result, even when
used under high water pressure such as deep sea, the vibrator is not affected by water pressure,
so the sound radiation surface or the part other than the incident surface is isolated, so that the
transmission and reception sensitivity frequency characteristics and directivity It is possible to
provide an underwater ultrasonic transducer which can obtain reliable measurement results
without causing disturbances.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a side sectional view showing an ultrasonic transducer according to the present
invention, and FIG. 2 is a side sectional view showing a conventional ultrasonic transducer.
DESCRIPTION OF SYMBOLS 7 ... Housing 8 ... Piezoelectric ceramic 9a, 9b ... Metal block 10 ...
Vibrator 11 ... Support metal fitting 12 ... Metal ring
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