JPH0334699

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DESCRIPTION JPH0334699
[0001]
FIELD OF THE INVENTION The present invention relates to a low frequency, high power
underwater ultrasonic transducer used in long distance sonar, marine research and the like.
[Prior Art] A conventional mFT wave transmitter-receiver used as a low-frequency high-power
transmitter / receiver with a number Hy in water, for example, is shown in FIG. There is a null
type transducer (see US Patent No. 1i1 Patent 11, S, +1, 3277433). The flex-tensimi 1 null type
transducer shown in FIG. 2 is composed of Acdip-like body 11 and shell 12, and the longitudinal
vibration of Ac dipe-like body 11 is transmitted to shell t 2 and shell 12 vibrates in bending.
Sound waves are emitted into the water. Problem to be Solved Usually, the vibration
displacement of the active corporate body used for t11 waves in water is as small as at most
several 10 microns. For this reason, in the case of the conventional Wi structure described above,
it is necessary to closely match the dimensions and the parallelism between the inner grooves
when inserting the active columnar body 11 shell 12 in order to efficiently transmit the
mechanical force. There is a drawback that it is difficult to assemble or very accurate. Also, with
the structure L, active columnar body 11? The direction in which the f wave is emitted (1
(because they are interrelated, there is a disadvantage that the efficiency of energy transfer is
poor. The present invention 1 has been made in view of the problems described above, and it is
easy to provide a combination of low-frequency underwater M19 wave transceivers with stable
characteristics and a high efficiency of energy transfer. I assume. [Solution to the Problem] In
order to achieve two aspects, the low-frequency underwater a-rr wave transmission / reception
according to the present invention can be used to reduce the amount of J [electromagnetic or
magnetostrictive material to one side of a pair of active columns. A rear mass is provided, and a
pair of levers are provided on the other side, and these levers are connected to the convex shell,
respectively, and both levers are attached to the mass via hinges and coupled to the rear mass via
bolts. is there. An example of the present invention will be described with reference to the
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drawings. FIG. 1 is an Iit cross-sectional view of one embodiment of the present invention. In
r'14, 1 is an active columnar body using a piezoelectric ceramic or a magnetostrictive material,
which is disposed on both sides of the shell 6 so that a longitudinal signal can be excited by
inputting a voltage or a current. The active company 1 is connected by a rear mass 2 disposed on
the side and connected to a convex-type shell 6 via a lever 7 or seven pieces.
In the figure, 5 is a mass, located between a pair of active columns 1 ° 1 and two connected
two levers 3 are persons (connected to the mass 5 through the hinge 4, and the mass 5 is an
active column It is connected via a rear mass 2 connected to the body l and a bolt 8. In the figure,
7 is connected from the rear mass 2 to the lever 3 through the active column 1 so that the
transmission of force from the active column 1 to the shell 6 where the rf echo radiation is
performed is performed efficiently. That is, by applying prestress, mechanical connection
between the active column 1 and the lever 3 can be completed completely. In addition, the
displacement of each part is shown by S1 to S5 shown by an arrow C in FIG. Next, the operation
of this embodiment will be described. When the active column 1 or 8 is displaced, the lever 3 or
S or Ij1 is displaced. The lever 3 is provided with the hinge 4 and the mass 5 and is connected to
the mass 2 via the bolt 6 in the past so that it is smoothly displaced by p-j1 and the shell 6 is
bent and deformed by the rotational displacement of the lever 3 Due to its shape effect, the
further enlarged displacement S3 is contested and ultrasonic waves are emitted into the water.
The displacement S3 due to the bending deformation of the shell 6 is in the same direction as the
displacement S1 of the active columnar body 1. Also, the transmission of force from the adip
tube l to the shell 6 where the acoustic radiation is performed can be performed effectively by
applying a bristling force or a force l). [Effects of IJFJ] As described above, according to the
present invention, the low frequency underwater ultrasonic transducer according to the present
invention makes the drive direction of the active columnar body coincide with the vibration
direction of the shell, and By applying the stress, it is possible to improve the energy transfer
efficiency from the active columnar body to the shell and to obtain particularly stable and stable
characteristics.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, and FIG. 2 is a
sectional view showing a conventional low-frequency underwater Mi sonic transducer.
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lNear contact column 2, rear mass 3 lever 4: hinge 5. Mass 6 · Shell 7 Por 1 to 8: Holt 11: Actitz
Column 12 · Shell S1 to S5: Displacement of each part
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