JPS5453991

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DESCRIPTION JPS5453991
1. Amorphous Magnetostrictive Transducer Amorphous Magnetostrictive Elastic Substrate The
thickness of the amorphous magnetostrictive elastic substrate of the thin film linear conductor
provided on the main surface The ratio t / w to the width W of the thin film linear conductor (1)
is alternately folded back and forth, and the folding interval of the thin film linear conductor is
changed positionally. An amorphous magnetostrictive transducer placed on the surface of an
amorphous magnetostrictive elastic body characterized in that
2, the scope of claims
Detailed Description of the Invention The present invention relates to an electroacoustic,
acoustoelectric transducer using an amorphous magnetostrictive material. In recent years,
research on amorphous magnetic materials has progressed, and (1) the results of various
developments have been announced. In particular, in the patent "Ultrasonic device using
amorphous alloy" (Japanese Patent Application Laid-Open No. 49-112551) of US Allied Chemical
Co., Ltd., the amorphous alloy is a very excellent ultrasonic propagation medium with a small
propagation loss, and It has been revealed that the amorphous alloy itself can be a
magnetostrictive transducer. Also in Japan, research in this field was vigorously promoted mainly
at Tohoku University, and part of the result was published in the Journal of the Japan Institute of
Metals (Vol. 15, No. 3, March 1976). Of particular noteworthy among the amorphous magnetic
materials disclosed herein is the existence of the magnetostrictive constant k30 × 10) and the
material of the electromechanical coupling coefficient Unconventional (Zo, 65). This property is a
bulk-like property of the material, but with regard to its application, the papers of the
Telecommunications Society of Japan and the 13th Symposium Proceedings by the Institute of
Electrical Communication, Amorphous Ferromagnetic Materials In the article published in In
particular, The electro-mechanical coupling coefficient in amorphous ferromagnetic ribbons
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(N01-7) Symposium Proceedings 13 of the same laboratory [Application of amorphous
ferromagnetic materials J (March 1977)] (N01-7) Acoustic continuous variable delay
phenomenon J (NO, 1 to 9), among which the large magnetostriction constant (z30 x 10) and the
large electromechanical coupling coefficient not found in the EndPage: 1 of the amorphous
magnetic material (A, 0, 65) and that the amorphous magnetic material itself becomes an
excellent magnetostrictive transducer, and the results achieved by both Dr. in particular for the
input and output quadrants of variable delay lines and resonator devices. Has been published. A
brief description of these transducers is shown in FIG. 1 in which a solenoid coil is wound around
an amorphous magnetostrictive thin plate, and in FIG. 2 in which a magnetic head is installed on
an amorphous magnetostrictive thin plate. As shown in the principle explanatory view of FIG. 3, a
substantially uniform magnetic field is generated in the longitudinal direction of the amorphous
magnetostrictive thin plate by the coil 2 or the magnetic head 5, and the Joule effect (also
referred to as the magnetostrictive effect) of this magnetic field is generated. The elastic strain is
obtained in the amorphous thin plate to excite the elastic wave corresponding to the input
electric signal. However, in the field of signal processing in telecommunications, these
transducers can only simultaneously output the analog signal with respect to the input of the
electric signal, and the elastic wave pulse necessary to obtain a complex synthesized electric
signal output It is not suitable for the application of exciting the group to the amorphous
magnetostrictive thin plate.
The reason is that, as shown in FIG. 3, the magnetic field generated by the solenoid coil 2 or the
magnetic head 3 of these transducers has only one magnetic field distribution in the longitudinal
direction, as shown in FIG. In terms of time, the solenoid coil 2 or the magnetic head 3 is similar
to the input electrical signal, but can excite only one elastic wave of the same excitation state as
the entire position area to be excited. For this purpose, in order to excite a plurality of elastic
waves in a desired positional relationship, as shown in FIGS. 4 and 5, a plurality of solenoid coil
groups or magnetic head groups are placed on the amorphous magnetostrictive thin plate. It was
necessary to satisfy the relationship and install it. Even if it is possible to calculate a
magnetostriction generator that satisfies such positional relationship, the realization of a solenoid
coil group or a magnetic head group having a length of 1 mm or less is extremely serious as seen
in the technology such as magnescale. It is difficult to excite multiple elastic waves at intervals of
1 mm or less. On the other hand, as a similar technology for exciting a plurality of elastic waves
in a desired positional relationship, a surface acoustic wave transducer having a comb-shaped
electrode installed on a piezoelectric elastic wave such as lithium niobate (LiNOx) or quartz, YIG .
A meander line-like transducer (F, W4 o 1 t maretal; Appl, Phys) on a magnetostrictive elastic
plate such as YAG. Letts, 15 (1969) 153) are currently developing surface acoustic wave devices,
but these are all techniques for surface acoustic waves, and the above-mentioned bulk
longitudinal wave phenomenon required here is It is clear that there is a need for a technology
that can utilize the bulk longitudinal wave phenomenon, since it is an essentially different
technology from those that use SUMMARY OF THE INVENTION The object of the present
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invention is to realize magnetostrictive bulk bulk of an amorphous magnetostrictive thin plate
which is compact, fine and easy to manufacture without realizing the above-mentioned
drawbacks of the prior art in order to realize various applied devices in the telecommunications
field of amorphous magnetostrictive material. It is an object of the present invention to provide
an electrical acoustic or magneto-optical magnetostrictive transducer for wave mode conversion.
In the present invention, the thickness t of the amorphous magnetostrictive elastic substrate and
the width W of the thin film linear conductor of the amorphous magnetostrictive elastic substrate
and the thin film linear conductor provided on the main surface thereof Provided on an
amorphous magnetostrictive thin plate characterized in that the distance between the turns of
the conductive structure formed by alternately turning the above-mentioned thin film linear
conductors such that Amorphous magnetostrictive transducer. An embodiment of an amorphous
magnetostrictive transducer according to the present invention will be described below with
reference to the drawings.
FIG. 6 is a perspective view showing the configuration of an amorphous magnetostrictive thin
plate 1 with a conductive structure (hereinafter referred to as input serpentine-type coil ) 4
formed by alternately turning back with changing the folding interval. FIG.
2, the scope of claims
The present invention will be described in detail. FIG. 7 is a characteristic diagram showing
magnetostriction-magnetic field characteristics of an amorphous magnetostrictive thin plate.
Now, when a high frequency current is supplied to the input-type coil 4, a high-frequency
magnetic field according to Ampere's theorem is generated around the folded back path of the
personal-type coil 4. In this case, the magnetic field distribution for a certain moment is as shown
in FIG. 8 in the longitudinal direction of the input serpentine coil 4 in the same direction, in
accordance with the folding pitch of the endork 2 coil. The directions of are alternating. The
magnetostriction of the amorphous magnetostrictive thin plate at the installation portion of the
coil 4 due to this magnetic field is caused by the Joule effect, but the distortion-magnetic field
characteristic shown in FIG. Since the distortion depends on the value of the feed regardless of
the direction of the magnetic field, the amorphous magnetostrictive thin plate 1 at the
installation portion of the input coiled coil is a fold return of the input coiled coil 4. The
magnetostrictive pulse group corresponding to the position of the path and the folding interval
can be excited as shown in FIG. The magnetic field distribution applied to the amorphous
magnetostrictive thin plate 1 when a current is supplied to the above-mentioned serpentine-type
coil 4 is shown in FIG. ただしP:=1、t=o、1、w=0.5、N=11としである。 Curves
indicated by numerical values of 100, 200, and 300 are equal field lines with respect to the
longitudinal component of the amorphous magnetostrictive thin plate. The unevenness in the
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thickness direction of the amorphous magnetostrictive thin plate of the magnetic field
distribution is largest at the center of the width of one path of the conductive structure. The
unevenness of the magnetic field distribution in the thickness direction of the amorphous
magnetostrictive thin plate is to generate a bending strain component in addition to the volume
strain in the longitudinal direction on the amorphous magnetostrictive thin plate. Here, the
relationship between the unevenness of the magnetic field in the thickness direction of the
amorphous magnetostrictive thin plate (Hm ′ ′ / Hmax) and the ratio of the width of the path
of the conductive structure to the thickness of the amorphous magnetostrictive thin plate It is
shown in FIG. Therefore, the present invention takes advantage of the fact that the thickness of
the amorphous magnetostrictive thin plate is as thin as several tens of microns, and the ratio (t /
w) of the thickness t to the width W of the conductive structure is at least t / w. It is assumed that
<1, Hm, in / Hmax> 0. As', the bulk longitudinal wave mode of the amorphous magnetostrictive
thin plate 1 used as a volume strain wave distributed over the thickness direction without
concentration of strain energy on the surface layer of the amorphous magnetostrictive thin plate
is obtained. This is essentially different from a surface wave element in which strain energy is
concentrated on the surface layer as t // w> 5. Although the case where the electric signal is
converted into the magnetostrictive elastic pulse group in the bulk longitudinal wave mode which
waves to the desired position of the amorphous magnetostrictive thin plate 1 has been described
above, the magnetostrictive elastic pulse group can be converted into the electric signal It is.
As a means for that, in one of the folding paths of the same type of input serpentine-type coil and
the same kind of ..7. A voltage is generated. Since the induced power in the serpentine coil 7 is a
combination of the voltages of the respective folding paths, the maximum sensitivity to the
magnetostrictive elastic pulse group in the positional relationship corresponding to the
geometrical shape and size of the serpentine coil 7 is obtained. Have. In FIG. 12, on the
amorphous magnetostrictive thin plate 1, the conductivity is such that the amorphous
magnetostrictive thin plate has a wider 'Fr return width than the width of the amorphous
magnetostriction thin plate, and changes the return interval and turns alternately. A structure
(hereinafter referred to as an output zigzag coil) is provided. The principle of operation of this
embodiment is the same as that of the first embodiment of the input serpentine coil described
above, except that the disturbance of the magnetic field due to the folded back portion 8 in the
longitudinal direction of the output serpentine coil 7 is eliminated. In FIG. 13, on the amorphous
magnetostrictive thin plate 1, an output serpentine-type coil 7 is installed which is alternately
folded back by changing the folding interval. The operation principle is the same as in the first
embodiment, but the output serpentine-type coil 7 and the amorphous magnetostrictive thin
plate 1 are in close contact with each other to eliminate the loss of the sound wave propagation
path and the disturbance of the impedance. As described above, according to the present
invention, an electroacoustic transducer which excites an elastic pulse group in which each
elastic wave is in a desired positional relationship or a maximum sensitivity to an elastic pulse
group in which each elastic wave is in a desired positional relationship. An acoustoelectric
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transducer can be realized without the use of multiple solenoid coils or magnetic heads.
Moreover, the serpentine coil can be made smaller and more easily than a solenoid coil or a
magnetic head, and the frequency range of the elastic wave can be expanded. The present
invention will be the basis of various devices in the telecommunications field of amorphous
magnetostrictive materials.
4. Brief description of the drawings. FIG. 1 is an explanatory view of a conventional amorphous
magnetostrictive transducer. FIG. 3 is a schematic of FIG. 1 and FIG. Fig.4, Fig.5 and Fig.5 are
explanatory diagrams of another example of the magnetostrictive transducer using a plurality of
solenoid coils or EndPage: 3, and Fig.6 is an amorphous magnetostrictive transducer according to
the present invention. FIG. 7 is a characteristic diagram showing magnetostriction-magnetic field
characteristics of an amorphous magnetostrictive thin plate, FIG. 8 is an explanatory diagram of
magnetic field distribution by a serpentine coil, and FIG. 9 is amorphous Explanatory drawing of
the distribution of the pulse train excited by the magnetostrictive thin plate, FIG. 10 shows the
distribution of the magnetic field applied to the amorphous magnetostrictive thin plate, and FIG.
11 shows the conductive structure width W and the amorphous magnetostrictive thin plate
Figures 12 and 13 show the relationship between the original ratio t / w and the magnetic field
unevenness. Ming is a configuration explanatory diagram of another embodiment of the. 1;
amorphous magnetostrictive thin plate, 2; solenoid coil. 3; magnetic head, 4; serpentine coil. 5;
one branch of a serpentine coil. Attorney Attorney Attorney 1) Toshiyuki Law / Figure 2 Figure 3
3 · 11 · Year 4 Country 5 5 Figure 1 · Figure 2 7 7 Figure 8 Figure On OnOD [D Coro Table + 8
Moe EndPage: 4 q qrM弯 長 L Ll グ 図 10 2 2 12 12 才 / 3 (Xo545-EndPage: 5
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