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JPS5455197

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DESCRIPTION JPS5455197
1. Amorphous magnetostrictive transducer 1 Amorphous magnetostrictive plastic pillar having a
first major surface and a second major surface and a folded thin film linear conductor on any one
of the major surfaces The spacing is changed, and alternately folded in a zigzag folded
conductive structure. In the installation line region -3 of the zigzag folded conductive structure,
in the traveling direction of the elastic wave to the amorphous magnetostrictive elastic material.
An amorphous magnetostrictive transformer characterized in that a DC bias magnetic field
application means is provided so as to change a parallel bias magnetic field distribution
component as desired. デューサ。 2. The DC bias magnetic field applying means is the
conductor.
2, the scope of claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to electroacoustic,
acoustoelectric transducers using amorphous magnetostrictive materials. In recent years,
research on amorphous magnetic materials has progressed, and various development results
have been announced. In particular, U.S. Pat. Ultrasonic apparatus "(JP-A-49-112551). Nonquality alloy has a very good ultra-small propagation loss. It is also a sound propagation medium
and amorphous alloy itself. Clearly it can be a magnetostrictive transducer. にされている。 Also,
Research Institute of Electrical Communication, Tohoku University. Tsuya. Dr. Arai is a
symposium at the institute. Proceedings of the proceedings 13 "Application of Amorphous
Ferromagnets" 1. EndPage: 1 (June 1977), “Amorphous electromechanical coupling coefficient J
(1-7) in amorphous ferromagnetic ribbons and [amorphous in ultrasonic continuous variable
retardation phenomenon J (1-9) in amorphous ferromagnetic ribbons] Magnetic materials have a
large magnetostriction constant of 50 × 10 -6 and a large electromechanical coupling coefficient
of 0.65, and it is clear that the amorphous magnetic material itself is an excellent
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magnetostrictive transducer. I have to. In these transducers, a solenoid coil is wound around an
amorphous magnetostrictive thin plate as shown in FIG. 1, or a magnetic head is installed on an
amorphous magnetostrictive thin plate as shown in FIG. Alternatively, an approximately uniform
magnetic field is generated in the longitudinal direction of the amorphous magnetostrictive thin
plate by the magnetic head, elastic strain is obtained in the amorphous thin plate by the Zeal
effect of the magnetic field, and an elastic wave corresponding to the input electric signal is
excited. There is something. However, in the telecommunications signal processing field, these
transducers are not suitable simultaneously for one 'electrical input signal pulse. The first reason
is that the magnetic field generated by the solenoid coil or magnetic shield of these transducers
is longitudinal as shown in FIG. Only one elastic wave can be excited to one solenoid coil or
magnetic head in the amorphous magnetostrictive thin plate because there is only a magnetic
field distribution of one wave in the 0 ° direction. For this reason, if it is intended to excite a
plurality of elastic waves in a desired one-position relationship, as shown in FIG. 4 and FIG. The
head must be placed in the desired position. There were some inconveniences. I-1 The second
reason is because of the inconvenience mentioned above. Solenoid coil with a length less than 1Also, realization of the magnetic head is difficult, and multiple elasticity. , It is difficult to excite
the wave at intervals of 1 ■ or less.
2oる・1.。 In addition, Limu niobe ~) (LiN03), a surface acoustic wave transducer in which a
comb-like electrode is installed on a piezoelectric elastic plate such as quartz, or YIG as a similar
technique for exciting elastic waves in a plurality of desired positional relationships. Although
surface acoustic wave transducers in which serpentine coils are installed on magnetostrictive
elastic plates such as YAG, YAG, etc. are currently being developed, these are all techniques for
surface acoustic waves, which will be described later. Essentially different techniques are
required to take advantage of bulk longitudinal wave phenomena. Further, as shown in FIG. 7, the
conventional amorphous magnetostrictive transducer proposed by the inventors shown in FIG. 6
has a substantially uniform DC bias magnetic field, so the peak value of the elastic strain under
the zigzag coil is Were nearly equal, and the peak value of each elastic strain could not be
changed to a desired value. The object of the present invention is to eliminate the drawbacks of
the prior art described above in order to realize various application devices in the
telecommunications field of amorphous magnetostrictive materials, and to obtain the desired
position of a compact, thin and easy to manufacture amorphous magnetostrictive thin plate. It is
an object of the present invention to provide a bulk longitudinal wave type electroacoustic or
acousto-electrostrictive transducer capable of weighting each "" pulse as desired with respect to
magnetostrictive elastic pulse groups in a quantitative relationship. The point of the present
invention is that the magnetostrictive material has a large magnetostriction constant, a large
coupling coefficient, and is a thin plate. 'As the magnetic field generating part for the conductor,
the conductor width W and the thickness t of the amorphous magnetostrictive thin plate hold the
relation of about w> t, and fold it. A DC bias magnetic field application means is provided which
changes the magnetic field parallel to the traveling direction of the elastic wave into a desired
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distribution shape using a serpentine type conductive structure which is alternately folded back
with different turning intervals. There is. DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS Below, an embodiment of an amorphous magnetostrictive transducer according
to the present invention will be described with reference to the drawings. FIG. , The configuration
of the amorphous magnetostrictive transducer of the present invention. , Figure. FIG. 9 is a top
view of FIG. Non. , Amorphous magnetostrictive thin plate 1 than amorphous magnetostrictive
thin plate thickness. 2o A bias magnetic field is formed by a conductive structure 6 (hereinafter
referred to as a "folded coil") having a wide conductor and changing a turnaround distance and
turning back at alternate EndPage: 2 and a solenoid coil distributed wound in the traveling
direction of the elastic wave. An application means is provided. A magnet may be used as the bias
magnetic field application means, and the installation method is in close contact, proximity, or
serpentine coil side 1 opposite. It may be either side.
2, the scope of claims
Hereinafter, the present invention will be described in detail. Now, when a high frequency
current is supplied to the IJ type coil 6, a high frequency magnetic field according to Ampere's
theorem is generated around the folding path of the same bending coil 6. Looking at this at a
certain moment, the magnetic field distribution alternates in the positive and negative directions
as shown in FIG. 16 (C) in the longitudinal direction of the serpentine coil according to the
folding pitch of the serpentine coil 6. ing. , Installation of serpentine coil 6 by this magnetic field.
Amorphous magnetostrictive thin plate 1 of part is magnetized by Joule effect. Although the
distortion is caused, the magnetic field distribution applied to the amorphous magnetostrictive
thin plate 1 by the above-mentioned zigzag coil 6 is shown in FIG. However, it's quite confusing.
Folded pitch of coil 6; p = 1. Amorphous magnetostrictive thin plate thickness: t = o, i, conductor
width of the zigzag coil: W = 05. Indicated by numbers such as 100, 200, 500. The curve is the
longitudinal component of the amorphous magnetostrictive sheet. Isomagnetic field lines.
Inhomogeneity in the thickness direction of the amorphous magnetostrictive thin plate of the
magnetic field distribution of the conductive structure. It becomes largest about the center of the
width of one road. . Due to this, a bending strain component is generated in addition to the
longitudinal stacking of the amorphous magnetostrictive thin plate. Here, in the center of the
above width, amorphous magnetostrictive thin film ・ Inhomogeneity of magnetic field in the
direction of thickness of plate (Hmin / Hmax) ′, width W of conductive structure path and
amorphous magnetostrictive thin plate The relationship between the thickness t and the ratio t /
n is shown in FIG. Therefore, according to the present invention, the thickness of the amorphous
magnetostrictive thin plate is t. The ratio t / w between the plate thickness t and the path width
W of the conductive structure is small. At least t / u <1 and the above heterogeneity; Hmt, n /
HmcL,> 0.1, strain energy is amorphous. The thickness without concentrating on the surface
layer of the magnetostrictive thin plate. Volumetric distortion waves, non-uniformly distributed
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throughout. It is also possible to use the bulk longitudinal wave mode of the amorphous
magnetostrictive thin plate. That is, in essence, it is essentially a surface wave element that
concentrates strain energy of tiw> s to the surface layer. Are different. By the way, since the
coupling coefficient of the amorphous magnetostrictive thin plate has the characteristic shown in
FIG. 12, when current is supplied to the distributed winding coil 7, it has a distribution in the
longitudinal direction as shown in FIG. 13 (α). A bias magnetic field is obtained. Therefore, the
distribution of coupling coefficients shown in FIG. 13 (b) can be obtained in the longitudinal
direction. As a result, elastic strain waves excited by the serpentine coil are in a desired ratio by
the distributed bias magnetic field according to the distribution of coupling coefficients.
It becomes a defined elastic distortion wave group. Location of each wave. As for the number, the
folding position of the serpentine coil is added by the number of folds, and as shown in FIG. 13
(d), the same as the folding logarithm of the serpentine coil. It is possible to obtain an elastic
strain wave having a desired ratio of wave height values at a position where the number wave is
folded back. The case of converting the electric signal into the magnetostrictive elastic pulse
group in the bulk longitudinal wave mode having the desired positional relationship and the
desired peak value ratio relation has been described, but the reverse magnetostrictive elastic
pulse group is converted into the electric signal. . Is also possible. One of the serpentine coils has
a villiary effect, that is, a flux linkage excited by one magnetostrictive elastic pulse. Induced
voltage is generated. In the serpentine coil, since the output is a combination of voltages of the
respective turnaround paths, the magnetostrictive elastic pulse group in a positional relationship
corresponding to the geometrical and shape dimensions of the serpentine coil 6 has a desired
weight. Get maximum sensitivity. るものである。 As described above, according to the present
invention, each acoustic wave is in a desired positional relationship, and each wave height value
has an electroacoustic transducer for exciting an elastic pulse group having a desired ratio, and
each acoustic wave is desired. An acoustoelectric transducer having a desired weighting with
respect to elastic pulse groups in a positional relationship to obtain maximum sensitivity can be
realized without using a plurality of solenoid coils or magnetic heads. In addition, the serpentine
EndPage: 3 coil is compared to a solenoid coil or magnetic head. It is small and easy to realize.
Since the frequency range of elastic waves can be expanded, signal processing in the
telecommunications field of amorphous magnetostrictive materials. It contributes greatly as a
basic technology of various devices.
4. Brief description of the drawings. FIG. 1 is a block diagram of a magnetostrictive transducer
using a conventional solenoid coil, FIG. 2 is a block diagram of a magnetostrictive transducer
using a conventional magnetic head, FIG. 4 is an explanatory view of a driving state of a
conventional magnetostrictive transducer, and FIGS. 4 and 5 are structural explanatory views of a
magnetostrictive transducer for obtaining a plurality of waves using the conventional
magnetostrictive transducer. FIG. 6 is a block diagram of a conventional amorphous
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magnetostrictive transducer, FIG. 7 is an operation explanatory diagram of the amorphous
magnetostrictive transducer of FIG. 6, and FIG. 8 is an amorphous of the present invention, 9 is
the top view of FIG. 8, FIG. 10 is the coupling coefficient-magnetic field characteristic diagram of
the amorphous magnetostrictive thin plate, and FIG. 11 is the one of the amorphous
magnetostrictive thin plate. . Magnetic field distribution diagram, FIG. 12 is an explanatory view
of the relationship between the ratio t / b of the amorphous magnetostrictive thin thickness t and
the conductor width W of the zigzag coil and the inhomogeneity of the magnetic field
distribution, FIG. d) The figure is this one. Operation | movement explanatory drawing of the
amorphous | non-crystalline magnetostrictive transducer of a bright | clear. である。 1;
amorphous magnetostrictive thin plate 2; solenoid coil 3; magnetic head 4; solenoid coil group 5;
magnetic head group 6; zigzag type coil 7; bias magnetic field applying means 8; Attorney
Attorney Attorney 1) Toshiyuki J5. ′1? 3 figures-+ Figure 15! 2I 6 6 7 Figure EndPage: 4 o /
21iffl 13 13 Figure EndPage: 5
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