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Description 1, title of the invention
Balanced output acoustic transducer
3. Detailed Description of the Invention The present invention relates to a balanced output
acoustic transducer capable of converting electrical energy to acoustic energy or acoustic energy
to electrical energy. For example, when viewing the state of a structure in a nuclear reactor, an
acoustic transducer having a single-ended type electrical terminal is used. The basic
configuration of this transducer will be described with reference to FIG. и The electric / acoustic
conversion element 2 made of a crystal plate of lithium niobate (LiNbO 2), for example, is fixed to
the bottom surface of the bottomed container 1 having an open top by a conductive adhesive, for
example While the electrode plate 3 is in contact with the upper surface of the electrode 2 and
the lead wire 5 is connected to the electrode terminal 4, the opening of the container 1 is
airtightly closed with a lid 6. Cable 7) is inserted and attached, core wire 8 of the coaxial wire 7
and the front P lead wire 5 are connected, and the sheath metal (sheath) 9 of the coaxial wire 7 is
airtightly connected with the viewer 6 . In the figure, reference numeral 10 denotes an insulator
of the coaxial wire 7, and reference numeral 11 denotes a connecting portion between the
container 1 and the fitting 6. I will explain the operation of this transducer. 'Electric energy is
supplied to the core wire 8 of coaxial # 7 and the external metal 9 One of the n1 currents is
supplied from the container 1 and the other is supplied to the conversion element 2 by the
electrode plate 3 n by the conversion element 2 The electrical energy is converted to acoustic
energy and passes through the bottom wall of the container 1 and the waves are radiated
EndPage: 1. The emitted sound wave collides with the target, passes through the bottom wall of
the reflected n 1 container 1, and is received by the conversion element 2. The received acoustic
energy is converted into electrical energy by the conversion element 2 and is extracted as an
electrical signal through the nm axis 7. In such an acoustic transducer 2, it is difficult to make the
ground side (cover metal 5) of the signal output terminal and the container 1 have the same
potential, and it becomes particularly difficult as the coaxial line 7 becomes longer. Therefore,
the ground on the side of the cover metal 5 often becomes a noise source, generating so-called
common mode noise. This common mode noise has not been mitigated at all with the
conventional unbalanced output terminal transducer, and thus has a drawback that the S / N
ratio is bad. An object of the present invention is to provide an acoustic transducer which
eliminates the above-mentioned drawbacks and removes common mode noise and which can be
used even at high temperatures. That is, the present invention uses an acoustic transducer
characterized in that the conversion element 2 is insulated from the container 1 in order to
remove common mode noise and the attenuation of the sound wave is small.
One embodiment of a transducer according to the present invention will be described below with
reference to FIG. The same reference numerals as in FIG. 1 denote the same parts in FIG. 2 and a
description of the overlapping parts will be omitted. That is, according to the present invention, a
ceramic plate insulator 21 with little attenuation of sound waves is closely attached to the bottom
surface of the heat-resistant bottomed container 1 made of, for example, stainless steel) through
the cylindrical cover (7, lower electrode plate 22). Deploy. Then, paste the electrode plate 3 on
the upper surface of the conversion element 2-on the electrode plate 3 (connect the lead wire 5
while connecting the lower electrode plate 22 to the lead wire 23) 's, tsq and t two-core cable No.
100 core wire 24 $ 25.26 (each iL has a connected structure. Here, when the thermal expansion
coefficients of the container 1 and the conversion element 2 are different from each other, it is
necessary to use a material having a thermal expansion coefficient 'It of the intermediate weir.
This is because thermal deformation causes, for example, cracking of the conversion element 2
or distortion of the container 1 to deteriorate the performance of the transducer. Moreover, the
insulator 2 was a material with small sound wave attenuation. For example, lithium niobate,
lithium tantalate, solder glass, alumina, magnesia, quartz, nuteatite porcelain, etc. are used. By the
way, although the signal from the conversion element 2 is taken out from the electrode plate 32
and 22, the two-core cable signal @ 24 is externally supplied with voltage and voltage 1. It is
completely shielded to avoid taking out the signal. Thus, the acoustic transducer according to the
present invention having the above configuration has the effect of reducing the induction noise.
FIG. 3 shows an equivalent circuit of an acoustic transducer focusing on a noise source. Here, zP
is a conversion element, rFi signal line and resistance of sheath metal, RL1d load resistance, z8 is
resistance between ground and ground wire sheath metal, noise source on EN earth line Show.
Since the following equation is established in this figure, the noise E appearing at the output
terminal by the noise source EN from this. Here is the second, II: I spoofed and asked. EN = (2Z, +
ZP + r + RL) 1, + 2Z, i ? ? иии ???? = ? EN = 2Z, + (2Z, + r) i2 ииииииии иииииииииииииииииииииииииииииииииииииииии The
transducer with the unbalanced terminal shown in FIG. 1 corresponds to 28 = 0 in FIG. If z8 = 0
in equation 0, Rt, ")) Zp, r (!: 'Tn:': EN toner, the voltage of the noise source appears at the signal
output terminal as it is.
However, in the balanced transducer according to the present invention, even if Zg = RL> Zp * r1
and the result EndPage: 2 such as r = 1000, Z, = 100 k?, it is reduced tenfold. FIGS. 4 and 5
show another embodiment of the transducer according to the present invention, in which the
same parts as in FIG. 2 are indicated by the same reference numerals. In FIG. 4, a conductive
layer 41 encircling the entire conversion element 2 is provided by plating, for example, and the
one-part conductive layer on the upper surface of the element 2 is removed annularly and an
annular insulating portion 42 is provided in the removed portion. An example is shown in which
one electrode 43 is in contact with the central portion 48, the other annular electrode 44 is in
contact with the peripheral portion, and the electrodes 45 are connected to the lead wires 5 and
23 via terminals 45 and 46. In V, 47 indicates an insulating cylinder. Thus, in this example, since
the entire peripheral surface of the conversion element 2 excluding the insulating portion 42 is
surrounded by the conductive layer, the 87N ratio is good, the conversion efficiency is high, and
the attenuation of the sound wave is small. Further, FIG. 5 shows a metal plate 53 connected to
the core 25.26 on the top surface of each spring 51.52 by providing concentric springs 51.52 on
the electrodes k43 and 44 formed on the top surface of the switching element 2 respectively. An
example is shown in which the .54 is disposed via the insulating plate 55. In the figure, 56 is the
spring 5 no. It is an insulating cylinder which insulates between 52. Thus, in this example, a
voltage is applied to the conversion element 2 and the electrodes 43 and 44 thereof via the
Sgueling 51.52, and a signal from the conversion element 2 is sent. Therefore, since the
conversion element 2 is pressed and deformed by the swelling 51.52, the electrical contact is
improved and the S / N ratio is improved without causing positional deviation even by a slight
vibration or the like. There is little attenuation. In the embodiment shown in FIG. 2, a transducer
is manufactured by connecting a LiNbO3 crystal plate to the conversion element 2 and a
thickness 2 and an On + LiNbO3 crystal plate to the insulator 21 to connect a high temperature
coaxial wire 10m. Noise was reduced to about 1/3000 as compared to the transducer shown in
FIG. The material of the sheath for the high temperature coaxial wire and the material of the core
wire were both a steel 2 of the same type, which was 350 among r shown in FIG. Further, the
load resistance RL was ? at the noliam input resistance 100. As described above, the transducer
according to the present invention has the following effects. (1) Since the conversion element 2 is
accommodated with an insulator interposed so as not to be in direct contact with the container 1,
the SA ratio does not decrease due to the choran mode noise.
(2) By using the material of the thermal expansion coefficient having an intermediate value
between the container 2 and the conversion element, the temperature resistance characteristic is
excellent. (3) By using a material having a low sound attenuation factor for the insulator, the
transducer's electro-acoustic conversion efficiency is excellent. 4.1 A brief view of the surface: A
longitudinal sectional view showing a conventional acoustic transducer, FIG. 2 is a longitudinal
sectional view showing one embodiment of an acoustic transducer according to the present
invention, and FIG. FIG. 5 is a schematic diagram showing equivalent circuits in FIG. 1 and FIG. 2,
FIG. 4 and FIG. 5-longitudinal sectional view showing another embodiment of the acoustic
transducer according to the present invention. DESCRIPTION OF SYMBOLS 1 ... Container 2, 2 ...
conversion element, 3 ... ', b-pole plate, 4 ... terminal, 5 ... Lead wire, 6 ... ?, 7 ... Coaxial wire, 8 ...
Core wire, 9: Outer cover metal, 10: Insulator, 11: Connecting portion, 21: Insulator, 22:
Electrode plate, 23: Lead wire, 24 и и Dual-core cable, 25.26 и и и и и и и и и и и и и conductive layer 1.42 и
и и insulation portion, 43 ░ 44 и и и electrode 45. 46 и и и и и и и и и и и и insulation Tube, 51.52: spring,
53.54: metal plate, 55: insulating plate, 56: insulating tube. Applicant Agent Attorney Takehiko
Suzue EndPage: ?
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