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JPS58123300

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DESCRIPTION JPS58123300
[0001]
TECHNICAL FIELD The present invention relates to a transducer mainly used for an ultrasonic
apparatus for communication. 2. Description of the Related Art Heretofore, in this type of
transducer, there are devices that share the electro-acoustic conversion unit for transmission and
reception, and devices that are dedicated separately. In the former case, if there is a matching
circuit for matching the transmission electric signal (input), there is a drawback that the
frequency characteristic of the reception sensitivity, which is the reception electric signal
(output), is limited 1 When a transformer that doubles as an impedance converter is connected to
an electroacoustic transducer using an electrostrictive material or the like having a capacitive /
actance component, and when the inductive reactance component of this transformer takes a
conjugate, this induction in the low frequency range The negative reactance component is
reduced, and the electrical signal (output) of the delivery is reduced. On the other hand, in the
latter case where the electroacoustic transducers of transmission and delivery are separated,
radiation planes for transmitting or receiving the sound pressure of these electroacoustic
transducers are separately configured and arranged. There is a drawback that the shape becomes
large and the weight increases, and 9). An object of the present invention is to provide a
transducer which is small in size, light in weight and excellent in transmission and reception
characteristics, except for these drawbacks. The transducer according to the present invention is
characterized in that the small-sized electroacoustic transducer for receiving wave made of a
piezoelectric material or an electrostrictive material is in close contact with the sound wave
emitting surface of the electroacoustic transducer for transmitting wave. Next, embodiments of
the present invention will be described with reference to the drawings. FIG. 1 is a perspective
view of a first embodiment of the present invention. The electroacoustic transducer of the
transmitted wave is a Langevin type vibrator composed of the front mass 1, the electrostrictive
material 2 and the rear mass 3 4 The electric equipment 4 has the following weight and
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thickness t-100 in comparison with the front mass 1 so as not to inhibit the vibration of the
Langevin type vibrator. In general, since the amount of energy transfer of the received
electroacoustic transducer is smaller than that of the transmitted wave, the received
electroacoustic transducer is sufficiently small and lightweight so as not to disturb the imaging
movement of the transmitted electroacoustic transducer. You can For example, the input and
output electric capacity of a normal transducer is such that the input during transmission is
several weeks or more (W) and the output during reception is several μW or less. The ratio can
easily be 1.10 or more. When transmitting this wave, this Langevin-type vibrator is vibrated to
transmit from the radiation surface of the front mass 1 (the side of the electrostrictive material
4), and when it is received, the electric wave is transmitted in the reverse relationship to that just
transmitted. The strain member 4 receives the sound pressure with full efficiency because the
back surface is supported by a heavy, rigid, near perfect copper body.
As a result, even if a conjugate circuit is included to efficiently supply the electrical input to the
electroacoustic transducer of the transmitted wave, the received wave is related to the frequency
characteristics of the conjugate circuit to obtain a signal in another electroacoustic transducer. It
is possible to obtain broad band reception sensitivity characteristics. FIG. 2 is a perspective view
of a second embodiment of the present invention. In this case, a cylindrical electrostrictive
material 5 is used as an electroacoustic transducing portion for transmitting waves, and
electrostrictive material 6t in close contact with a 90 ′ ′ interval as an electroacoustic
transducing portion for delivery on the radiation surface (outer cylinder surface) I'm glued. In
this transmitted wave, the cylindrical electrostrictive material 5 vibrates as a vibrator and
vibrates, and a shear wave is emitted from the radiation surface (outer cylinder surface). As in the
case of the first embodiment, this vibration can ignore the influence of the electrostrictive
material 6. On the other hand, even in the case of receiving wave, the receiving sensitivity
characteristic of a wide band can be obtained as in the case of the first and the first embodiment),
but in this embodiment, the electrostrictive material 6 is 90 ° to the cylindrical surface. It is
possible to have a separate function of the incoming wave direction by processing this signal if
there is a directionality with respect to the incoming sound wave direction of each received wave,
and it is possible to arrange it at intervals. In the above embodiments, when a polymer
'piezoelectric material is used as the material of the electroacoustic transducer of the delivery,
the physical characteristics of this material are close to that of the propagation medium of sound
waves such as water, and it is light and soft. Therefore, it is possible to obtain a better transmitter
/ receiver characteristic with less influence of the transmission to the electroacoustic transducer.
As described above, the present invention has an integrated structure in which the
electrostrictive material of the electroacoustic transducer of the delivery is in close contact with
the radiation surface of the acoustic wave of the electroacoustic transducer of the transmitted
wave. (9) It is possible to separately provide the electrical input / output terminals of the
electroacoustic transducer for transmitting and receiving waves, and even if the electroacoustic
transducer for transmitting wave is provided with a conjugate circuit that improves high power
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transmission, The frequency characteristics of sensitivity can be obtained in a wide band.
Furthermore, if the radiation surface is three-dimensional like a cylindrical surface, 1! By
arranging the electroacoustic transducers of a plurality of received waves on the orthogonal
coordinate axes, there are effects such as being able to have a function of the sound wave arrival
direction.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a perspective view of the first embodiment of the present invention, and FIG. 2 is a
perspective view of the second embodiment of the present invention. ... · · · · · · · · · · · · · · · · · · · · · · ·
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