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JP2000278796

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DESCRIPTION JP2000278796
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electroacoustic transducer using a piezoelectric vibrator that emits acoustic radiation into water,
and in particular, a plurality of piezoelectric vibrators are arranged in a cylindrical shape, and
acoustic radiation using respiratory vibration mode of the cylinder. Relates to a cylindrical
transmitter.
[0002]
2. Description of the Related Art Heretofore, as shown in, for example, Japanese Utility Model
Application Laid-open No. 05-88094 and Japanese Patent Laid-Open No. 05-014998, this type of
cylindrical wave transmitter utilizes the resonance frequency of the cylinder in the respiratory
vibration mode. It is used for the purpose of obtaining high output at low frequency. Further, as
disclosed in Japanese Patent Application No. 11-019792, it is small in size when not in use, and
enlarged in size when using it, to obtain a low frequency and large output by using a resonance
frequency in a respiratory vibration mode of a cylinder. Used for the purpose of
[0003]
FIG. 8 is a block diagram showing an example of a conventional general type cylindrical wave
transmitter. The conventional cylindrical wave transmitter is arranged in a cylindrical shape by
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1
using a plurality of drive units 13 formed by sandwiching the stacked piezoelectric vibrator stack
17 with the connection fitting 11 and clamping it with a prestress bolt 16 as shown in FIG. At
this time, the connection fittings 11 of the drive unit 13 are connected to each other by bolts 12.
Further, the inner and outer peripheral portions of the cylindrical shape are watertight treated
with a rubber boot 15, and the inside of the rubber boot 15 is structured to have an oil 14 having
good sound permeability.
[0004]
Next, the operation will be described. When an electrical signal at the same frequency as the
resonance frequency (fr) generated in the entire cylindrical shape is applied to the stacked
piezoelectric vibrator stack 17, resonance by the respiratory vibration mode of the cylindrical
transmitter obtains acoustic emission with high efficiency. be able to. Here, the resonance
frequency (fr) is approximately fr ヤ ン グ (E / ρ) / 2πd: Formula (1), where E is the Young's
modulus of the drive unit, ρ is the density, and d is the average radius of the cylindrical shape. It
can be expressed. Therefore, the resonance frequency can be lowered by increasing the average
radius d of the cylindrical shape.
[0005]
The problem with the prior art shown in FIG. 8 is that, in the case of a cylindrical transmitter, in
the case of acoustic radiation with low efficiency at a high frequency, the size increases and the
storability is poor.
[0006]
The reason is that, in the case of emitting sound at a low frequency with high efficiency, it is
necessary to increase the diameter and obtain a respiratory vibration mode of a cylinder having a
low frequency resonance frequency.
[0007]
Therefore, an object of the present invention is to perform high efficiency acoustic radiation in a
respiratory vibration mode of a cylinder having a low frequency resonance frequency, to
miniaturize when not in use to improve storability, and to increase the diameter during use To
provide a cylindrical transmitter capable of performing the above-mentioned acoustic radiation.
[0008]
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2
Another object of the present invention is to provide a highly reliable cylindrical wave
transmission device which is compact when not in use and has a large diameter when used.
[0009]
According to the present invention, in a transmitter which forms a cylinder with a plurality of
drive units using piezoelectric vibrators, when not in use, the transmitter is divided into a
plurality of groups and stored in a central portion of the cylinder. In use, a mechanism for
expanding the drive unit is used to obtain a cylindrical transmitter that arranges the drive unit at
the required outer diameter of the cylinder.
In the present invention, after this operation, a mechanism for clamping the drive unit group
from the outer periphery is used to eliminate the gap between the drive units, to form a
cylindrical shape, and strongly tighten the whole. Shape breathing vibration mode.
[0010]
In the present invention, in the wave transmitter which forms a cylinder with a plurality of drive
units using piezoelectric vibrators, the drive units are not fixed by bolts or the like, so that they
can be freely shaped when not in use. Can be stored in
Also, in use, the drive unit group is arranged to the required outer diameter of the cylinder by the
mechanism that spreads the drive unit, and after this operation, the drive unit group is tightened
by the mechanism that clamps from the outer periphery. It disappears, becomes cylindrical
shape, and forms a cylindrical wave transmitter.
At this time, the vibration mode of the plurality of drive units becomes a cylindrical respiratory
vibration mode by tightening the pressure more strongly than the outer periphery.
Therefore, a large diameter cylindrical transmitter having a low frequency resonance frequency
can be compactly stored when not in use. In addition, since no chemical change such as a resin is
used to increase the diameter, the shape is stable for a long time and has high reliability.
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[0011]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention
will be described in detail with reference to the drawings.
[0012]
The configuration of the cylindrical wave transmitter at the time of storage according to the
embodiment of the present invention will be described with reference to FIG.
In FIG. 1, when unfolded, drive units constituting a large cylindrical transmitter connected
together are accommodated as a plurality of two types of drive units 1A and 1B as illustrated.
Furthermore, as a configuration for supporting the deployment of these two types of drive units,
the shape memory property in which a shape memory rigid material that is stored by heat is
shrunk at a plurality of locations in a spring-like shape Fixing metal fitting 4A for fixing the rigid
ring 2, the wire 3, the drive unit 1A and the rigid ring 2 of shape memory property and for
passing the wire 3, fixing metal fitting 4B for passing the wire 3 through the driving unit 1B Is
provided. The two types of drive units 1A and 1B are not fixed, and in the storage state, the drive
unit group 1A is arranged inside and the drive unit group 1B is arranged circumferentially
around it. A shape-memory rigid ring 2 is fixed to the inside of the drive unit 1A by a fixing
bracket 4A, and the wires 3 alternately pass through the fixing bracket 4A of the drive unit 1A
and the fixing bracket 4B of the drive unit 1B.
[0013]
The configuration of the drive units 1A and 1B will be described with reference to FIG. The drive
units 1A and 1B are fan-shaped piezoelectric vibrators 7 covered with a urethane resin 8 in a fanlike shape, and the urethane resin 8 maintains watertightness. Here, the side surfaces of the fanshaped piezoelectric vibrator 7 are polarized by the electrodes 10A and 10B of different
polarities, and the electrode 10A leads to the lead wire 20A and the electrode 10B leads to the
lead wire 20B. The lead wires 20A and 20B of the drive units 1A and 1B are grouped with the
same polarity.
[0014]
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The shape memory rigid ring 2 will be described with reference to FIG. The shape memory rigid
ring 2 memorizes a large diameter cylindrical shape, and when stored, it exists in the shape of
being shrunk in the form of a plurality of springs. Further, it is connected to the power supply 5
through the lead wire 21. The inside of the lead wire 21 has a pair wire structure, and can be
connected to the shape memory rigid ring 2 so that a current can flow from the power supply 5.
[0015]
The fixing bracket 4A will be described with reference to FIG. The fixing metal fitting 4A is
attached to the drive unit 1A at one place so as to be orthogonal to the fan-shaped arc, and is
fixed to the shape memory rigid ring 2 inside the drive unit 1A. In addition, the fixing bracket 4A
has a central position in the height direction formed in a ring shape through which the wire 3
passes on the outer side of the drive unit 1A, through which the wire 3 passes. The fixing bracket
4B will be described with reference to FIG. The fixing metal fitting 4B is attached to the drive unit
1B at two places so as to be orthogonal to the fan-shaped arc, and in the outside of the drive unit
1B, the central position in the height direction is an annular shape through which the wire 3
passes. ing.
[0016]
The wire 3 will be described with reference to FIG. The wire 3 alternately passes through the
outer ring of the fixing bracket 4A of the drive unit 1A and the outer ring of the fixing bracket 4B
of the drive unit 1B and turns around. Further, one end of the wire 3 is fixed to the fixing bracket
4B of one drive unit 1B, and the other goes around the drive unit 1A, 1B group, and then passes
through the ring of the fixing bracket 4B, It is connected to the take-up mechanism 6. Here, the
length at the time of storage of the wire 3 is longer than that at the time of cylinder formation,
and is loose.
[0017]
Moreover, in the structure of a present Example, although the wire 3 is one, a number may be
plural and a shape may be flat plate shape.
[0018]
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Next, a configuration after the cylindrical wave transmitter according to the embodiment of the
present invention is developed, that is, used, will be described with reference to FIG.
The plurality of drive units 1A and 1B are alternately arranged to form a large diameter
cylindrical shape, and the shape memory rigid ring 2 changes to the stored large diameter. Next,
the wire 3 is taken up by the take-up mechanism 6 and becomes circular, and the drive units 1A
and 1B are tightened. Here, the average radius of the cylindrical cylindrical transmitter is set to
be a desired resonance frequency. Here, the drive units 1A and 1B of FIGS. 1 and 2 may use the
rectangular piezoelectric vibrator 9 of FIG. The drive units 1A and 1B may be a combination of
FIGS. 3 and 4.
[0019]
Next, the developing operation from storage to use according to the embodiment of the present
invention will be described with reference to the cross-sectional views of FIGS. 5 (a), (b), (c) and
(d). When a current flows from the power supply 5 to the shape memory rigid ring 2 through the
lead wire 21, heat is applied to the shape memory rigid ring 2, and the shape memory rigid ring
2 is shrunk like a spring by heat. The second part extends in the shape previously stored (FIG. 5
(b)). The drive unit 1A fixed to the shape memory rigid ring 2 by the fixing fitting 4A moves to
the outer diameter of the required cylinder and presses it by a series of operations caused by the
deformation of the shape memory rigid ring 2. As a result, the surrounding drive unit 1B spreads
(FIG. 5 (c)). After this operation is finished, the loose wire 3 is wound by the winding mechanism
6. At this time, the wire 3 is tightened, and the drive unit 1B is pulled, and enters the space
between the drive units 1A expanded in a cylindrical shape by the deformation of the shape
memory rigid ring 2 to form a cylindrical shape (FIG. 5 (d)). When it is further wound up, the
drive units 1A and 1B have no gap, and do not move inward, and are strongly tightened from the
outside (FIG. 2, FIG. 5 (d)).
[0020]
When an electric signal having the same frequency as the resonance frequency calculated by the
lead wires 20A and 20B according to the equation (1) is input to the cylindrical transmitter
shown in FIG. 2, the drive unit 1A and 1B are strongly tightened from the outside. The vibrations
are integrated and sound is emitted in a cylindrical respiratory vibration mode.
[0021]
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The configuration of the cylindrical wave transmitter at the time of storage according to another
embodiment will be described with reference to FIG.
Instead of the wire 3 and the winding mechanism 6 of FIG. 1, the large diameter is made of a
rigid ring 18 of shape memory property which is shaped like a plurality of springs and shrunk by
heat. The shape memory rigid ring 18 memorizes a small diameter cylindrical shape, exists in a
shape extending to a large diameter when not used, and secures the outer ring of the fixing
bracket 4A of the drive unit 1A and the fixing bracket of the drive unit 1B. The outer rings of 4B
are alternately passed each other. Further, it is connected to the power supply 5 through the lead
wire 22. The inside of the lead wire 22 has a pair wire structure, and can be connected to the
shape memory rigid ring 18 so that a current can flow from the power supply 5.
[0022]
In addition, the configuration of the cylindrical transmitter in use according to another
embodiment will be described with reference to FIG. The plurality of drive units 1A and 1B are
alternately arranged to form a large diameter cylindrical shape, and the shape memory rigid ring
2 changes to the stored large diameter. Next, the shape memory rigid ring 18 is shaped like a
plurality of springs, and is shrunk to the stored small diameter, and the drive units 1A and 1B are
tightened.
[0023]
According to the first aspect of the present invention, a large diameter cylindrical wave
transmitter capable of highly efficient acoustic radiation in the respiratory vibration mode of a
cylinder having a low frequency resonant frequency is not used. At times, it can be miniaturized
and the storability is improved.
[0024]
The reason is that it consists of multiple drive units, a mechanism that spreads the drive unit to
the required position at the time of use, and a mechanism that strongly tightens the whole from
the outside at this time. It can be housed in the center, and in use, it is possible to form a
cylindrical transmitter of a predetermined size from this state.
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[0025]
The second effect is that the reliability is improved in a cylindrical transmitter capable of
emitting acoustic radiation with high efficiency in a respiratory vibration mode of a cylinder
having a large diameter in use and a low frequency resonance frequency. is there.
[0026]
The reason is that the components necessary for increasing the diameter do not use resins that
make use of chemical changes that are difficult to adjust.
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