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JPS5455196

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DESCRIPTION JPS5455196
Description 1, title of the invention
Amorphous magnetostrictive transducer
6, detailed description of the invention The present invention is an electroacoustic using
amorphous magnetostrictive material. It relates to tilt air trafficking. In recent years, research on
amorphous magnetic materials has progressed, and results of various developments have been
announced. In particular, the patent "Ultrasonic device using amorphous alloy" (US Pat. No. 49112551 J) of US Allied Chemical Co., Ltd. (in Japanese Patent Laid-Open No. It has been shown
that the quality alloy itself can be a magnetostrictive transducer. In addition, Dr. Tsuya and Dr.
Arai of the Tohoku University Research Institute of Electrical Communication are in charge of the
symposium research of the research institute, and also $ 13 “Application of amorphous
ferromagnetic material [End Page: 1977 in Electric. Mechanical coupling coefficient J (1-7) and
[Amorph. Ultrasonic Continuously Variable Delay in Amity Ferromagnetic Thin Strip. Among the
amorphous magnetic materials in elephant J (1-9), the conventional 72 with large
magnetostriction constant of 0.65 as 50 × 10: Some have large electromechanical coupling
coefficient, and amorphous magnetic materials themselves are superior It becomes clear that it
becomes a magnetostrictive transducer. These transducers have a solenoid coil wound on an
amorphous magnetostrictive thin plate as shown in FIG. 1, or a magnetic head installed on an
amorphous magnetostrictive thin plate as shown in FIG. Furthermore, a substantially uniform
magnetic field is generated in the longitudinal direction of the amorphous magnetostrictive thin
plate by a coil or a magnetic field, and an elastic strain is obtained in the amorphous thin plate by
the Zeal effect of this magnetic field to generate an input electric signal. Some excite
corresponding elastic waves. In the field of signal processing in telecommunications, these
transducers are used to simultaneously generate a plurality of elastic wave barriers each having a
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desired positional relationship with respect to one electric human power signal pulse. . Suitable
for use to excite cis group into amorphous magnetostrictive thin plate. さない。 The first reason
is that the magnetic field generated by the solenoid coil or magnetic head of these transducers
has only a single-wave magnetic field distribution in the longitudinal direction as shown in FIG. It
is not possible to excite 1 elastic wave and 711) to 1 solenoid coil or magnetic head. For this
reason, if it is intended to excite a plurality of elastic waves in a desired positional relationship, as
shown in FIGS. 4 and 5, a plurality of solenoid coils or magnetic coils are desired on the
amorphous magnetostrictive thin plate. The second reason for the inconvenience is that it must
be installed in a positional relationship, and the second reason is the realization of a solenoid coil
or magnet to a length of 1a1 or less even if the inconvenience described above is realized. It is
difficult to excite multiple elastic waves at intervals of 1 鵡 or less. O Also, it is an analogous
technique to excite acoustic waves in a desired positional relationship with a number of lithium
naio.
Piezoelastic plates such as bats (Likes) and quartz. Surface acoustic wave transformer provided
with a shaped electrode, A surface acoustic wave truss drager has been developed at present, in
which a serpentine-shaped co- or ile is placed on a magnetostrictive elastic plate such as YIG,
YAG, etc., but these are all bullets. It is a technology that targets all surface acoustic waves, and in
order to use the bulk longitudinal wave phenomenon as described later, it requires an essentially
different technology. Further, as shown in FIG. 7, the conventional amorphous magnetostrictive
transducer proposed by the inventors shown in FIG. 6 has a substantially uniform direct current
bias magnetic field, and therefore the peak value of the elastic strain under the zigzag coil is It
was nearly equal, and it was possible to change the peak value of each elastic strain to a desired
value. The object of the present invention is to eliminate the drawbacks of the prior art as
described above, and to use a plurality of coils or magnetic coils, each between the legs in an
amorphous magnetostrictive sheet. A plurality of bulk mode longitudinal waves are excited at
intervals and in which the ratio of each peak value has a desired relationship. Alternatively, it is
an amorphous that carries out acousto-electrical conversion with desired weighting. To provide a
magnetostrictive transducer. The gist of the present invention is a large magnetostriction
constant as a magnetostrictive material. Also, it has a large coupling coefficient and is a thin
plate. A magnetic field component parallel to the traveling direction of an elastic wave, using an
amorphous magnetostrictive material and a serpentine-type conductive structure alternately
folded back at a constant interval as a magnetic field generating portion for acoustic wave
excitation of the magnetostrictive material The DC bias magnetic field applying means for
changing the magnetic field into a desired distribution form is as follows. An embodiment of the
amorphous magnetostrictive transducer according to the present invention will be described with
reference to the drawings. FIG. 8 is a block diagram of an amorphous magnetostrictive
transducer of the present invention. FIG. 9 shows a conductive structure (hereinafter referred to
as a zigzag coil) alternately folded at substantially constant intervals with a conductor @ wider
than in the top view of FIG. 8 and a solenoid wound distributed in the traveling direction of the
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elastic wave A bias magnetic field applying means by a coil is provided. Bias magnetic field
applied. EndPage: 2 means may use a magnet, and the installation method is close contact,
proximity or serpentine coil side 1 reverse. Either side may be used.
Amorphous magnetostrictive transducer
The present invention will be described in detail below. Now, when a high frequency current is
supplied to the serpentine coil 6, a high frequency magnetic field according to the processing of
unveiling occurs around the folding path of the same serpentine coil. Looking at this
momentarily, the magnetic field distribution alternates in the longitudinal direction of the
serpentine coil 6 and in the positive and negative directions as shown in FIG. It has become. The
amorphous magnetostrictive thin plate at the installation portion of the serpentine coil causes
magnetostriction by the Joule effect due to this magnetic field, but the magnetic field distribution
when the slit is made from the serpentine coil 6 to the amorphous magnetostrictive thin plate is
shown in FIG. Indicated. However, the folded beach p = 1 of the serpentine coil 6 ′, the
thickness of the amorphous magnetostrictive thin plate t. = 0, i, in the conductor of the
serpentine coil + 11 + = 0.5, A = 11 and l,-r. Curves indicated by numerical values such as 100-;
200. 500 are longitudinal components of the amorphous magnetostrictive thin plate. Is an
isomagnetic field line about Amorphous magnetic field distribution. Inhomogeneity in the
thickness direction of the magnetostrictive thin plate is a conductive structure. The biggest about
the center of the ant on one of the roads. る。 This is the original, longitudinal direction to the
amorphous magnetostrictive thin plate. In addition to the volume strain of the above, a bending
strain component is generated. Here, the inhomogeneity of the magnetic field in the thickness
direction of the amorphous magnetostrictive thin plate at the center in the above (E ′ ′! The
relationship between Ln / E □ 6] and the ratio W of the path width W of the conductive
structure and the plate thickness t of the amorphous magnetostrictive thin plate is shown in FIG.
Therefore, the present invention takes advantage of the fact that the thickness t of the
amorphous magnetostrictive thin plate is as thin as several tens of microns. The ratio of strain
thickness t to the path width W of the conductive structure is 1/1, at least 1 and strain energy is
concentrated in the surface layer of the amorphous magnetostrictive thin plate as the nonconstant 廖 B 〒 1 Emar) 0.1. Without the volume strain wave uniformly distributed throughout
the thickness, the bulk longitudinal wave mode of the amorphous magnetostrictive thin plate is
to make full use of 0, ie approximately /, E) strain energy of 5. It is essentially a surface wave
element that concentrates on the surface layer. It is different. By the way, the coupling coefficient
of the amorphous magnetostrictive thin plate 1 has the characteristics shown in FIG. 10 °.
When a current is supplied to the id coil 7, as shown in FIG. Bias magnetic field with a
longitudinal distribution. Is obtained. Therefore, the distribution of coupling coefficients shown in
FIG. 13 (A1 can be obtained in the longitudinal direction. As a result, the elastic strain waves
excited by the zigzag coil have a group of elastic strain waves in which the wave height values
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are added to a desired ratio by the distributed bias magnetic field according to the distribution of
the coupling coefficient.
The position and number of each wave are added by the folding position of the serpentine coil
and the number of turns, and as shown in FIG. 13 (d1 as shown in FIG. It is obtained in the
desired ratio. Although the case has been described above where the electrical signal is converted
to the magnetostrictive elastic pulse group in the bulk longitudinal wave mode with a peak value
ratio substantially at the foot interval vcFFr, it is also possible to convert the reverse
magnetostrictive elastic pulse group to the electrical signal. In one of the folded paths of the
serpentine coil, an induced voltage is generated due to a villiary effect, that is, a linkage flux
generated by one magnetostrictive elastic pulse. In the serpentine coil, since the output is a
combination of voltages of the respective turnaround paths, the magnetostrictive pulse group in
a positional relationship consistent with the geometrical shape dimension of the serpentine coil 6
obtains the maximum sensitivity to the desired weighting. It is a thing. As described above,
according to the present invention, each elastic wave pulse is in a positional relationship of
substantially constant intervals, and an elastic energy is excited with a desired weighted group of
elastic wave pulses. Alternatively, it is possible to realize an amorphous magnetostrictive
transducer that performs acoustoelectric conversion by weighting the elastic pulse group in a
desired positional relationship without using a plurality of solenoid coils or magnets. In addition,
the serpentine coil is smaller than a solenoid coil or a magnetic coil, and it is easy to make a fine
coil, and it is possible to expand the frequency range of elastic waves. It contributes greatly as a
basic technology for signal processing devices in the telecommunications field.
“EndPage: 3
4. Brief description of the drawings Fig. 1 is a block diagram of a magnetostrictive transducer
using a conventional solenoid coil, and Fig. 2 is a block diagram of a magnetostrictive transducer
using a conventional magnetic head and a sensor. FIG. 6 is an explanatory view of one driving
state of a conventional magnetostrictive transducer, and FIGS. 4 and 5 are structural diagrams of
the magnetostrictive transducer for obtaining a plurality of waves using the conventional
magnetostrictive transducer. Fig. 6 shows the configuration of a conventional amorphous
magnetostrictive transducer, Fig. 7 shows the operation of the amorphous magnetostrictive
transducer of Fig. 6 and Fig. 8 shows the 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 magnetic field distribution diagram of the
amorphous magnetostrictive thin plate The 129th is the ratio of the difference between the
amorphous magnetostrictive thin plate thickness t and the W in the conductor of the serpentine
coil and the unevenness of the magnetic field distribution. Sexual relations illustration, the 13
(α1~td1 FIG amorphous magnetostrictive transformer tape of the present invention - is an
operational theory 's explanatory view of a support 011 amorphous magnetostrictive thin plate,
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21 a solenoid coil. 6I magnetic hard, 4I solenoid coil group. 5 廖 magnetic group ~ 6M zigzag coil.
7 I bias magnetic field application means, 1 M distributed bias magnetic field application means.
Attorney Attorney Thin EB 狗 i 71 Figure 2 Figure? 3 figures + figure! t'6 figure toe → 1tf 7
closed east 100,000 town board! XEndPage: 4
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