JPS5453993

Patent Translate
Powered by EPO and Google
Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5453993
Detail Cao 1, Name of Invention
Amorphous magnetostrictive transducer
6. Detailed Description of the Invention The present invention relates to an amorphous
magnetostrictive transducer for electroacoustic and acoustoelectric conversion.-Recent research
on amorphous magnetic materials has been advanced. 1 Various development results have been
announced There is. Among other things, the patent "Ultrasonic device using amorphous alloy"
(Alloy Chemical Industries, Inc., April 49-112,255) that the amorphous alloy is a very excellent
ultrasonic propagation medium with a small propagation loss, It is clarified that the amorphous
alloy itself can be a magnetostrictive transducer. In addition, Dr. Arai, a researcher at the Tohoku
University Research Institute of Electrical Communication, presented the Proceedings of the
Symposium on Amorphous Ferromagnets 13 [March 1977] Electromechanical Coupling
Coefficients in Amorphous Ferroelectric Strips Also in J (i-7) and amorphous ferromagnetic
thin strip J (1-9) in ultrasonic continuous variable retardation phenomenon, the large
magnetostriction constant of 3DX10 and 0.65 in EndPage: 1 of the amorphous magnetic material
Is that a conventional force or a large electromechanical coupling factor? Have made it clear that
the amorphous magnetic material itself becomes an excellent magnetostrictive transducer. These
transducers have a solenoid coil 2 on the amorphous magnetostrictive thin plate 1 as shown in
FIG. , Or as shown in FIG. 2, 1-7 of the magnetic shield 3 placed on the amorphous-strain thin
plate 1. Further, as shown in FIG. 3, the coil 2 or the magnetic gate 3 generates a substantially
uniform magnetic field in the longitudinal direction of the amorphous magnetostrictive thin plate
1 and the amorphous thin plate 1 is produced by the Zeal effect of this magnetic field. In the
signal processing field of telecommunication, while obtaining elastic distortion and exciting an
elastic wave corresponding to an input electrical signal, the lano transformer can simultaneously
04-05-2019
1
generate a plurality of signals for one electrical input signal pulse. Rl I, h suitable for the
application of exciting the elastic wave pulse group to the amorphous magnetostrictive thin plate
1 such that each has a desired positional relationship. The first reason is that the magnetic field
generated by the solenoid coil 2 or the magnet 3 of the transducer does not have a longitudinal
magnetic field distribution and force in the longitudinal direction as shown by a curve 10 shown
in FIG. Also, it is impossible to excite one elastic wave in the amorphous magnetostrictive thin
plate 1 with respect to one solenoidal coil 2 or one magnetic coil 3. For this reason, if it is
intended to excite all of the elastic waves in a plurality of desired positional relationships, as
shown in FIGS. 4 and 5, a plurality of solenoid coils 4 or magnetic coils 5 may be formed on the
amorphous magnetostrictive thin plate 1. Should be placed in the desired positional relationship.
The second reason is that the realization of a solenoid coil or magnetic head with a length of one
wing or less is realized even if it is realized with the inconvenience described above. It is difficult
to excite a plurality of elastic waves at intervals of one breath or less.
Also, as a similar technique for exciting elastic waves in a plurality of desired positional
relationships, lithium niobate (Li! VO5), a surface acoustic wave transducer provided with a
comb, 3 or shaped electrode on a piezoelectric elastic plate such as quartz, a magnetostrictive
elastic plate such as YIG, YAG, etc Have been developed, but they are all techniques targeted at
surface acoustic waves, and require techniques that are fundamentally different from those using
the Krug longitudinal wave phenomenon. The conventional amorphous magnetostrictive
transducer shown in FIG. 7 has a relationship of hv = 2 kp between the elastic wave number yrr
and the folding number hp of the serpentine coil 6, and the folding of the serpentine coil 6 is as
shown in FIG. Inconvenient for the purpose of obtaining an elastic wave corresponding to 1 to 1
目的 The object of the present invention is to overcome the drawbacks of the prior art mentioned
above in order to realize various application devices in the telecommunications field of
amorphous magnetostrictive material Not small, small Dense and ρλ also Sozo easy each pulse
of amorphous magnetostrictive thin plate is to provide all electro-acoustic or Sehibiki Hiroshiki
magnetostrictive transformer Deesa bulk longitudinal mode of the magnetostrictive acoustic
pulse group serving as a constant interval. · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · Amorphous double-sided elastic body and continuous thin-film linear conductor
provided on one of its main surface Conductive structures and bonds. An amorphous
magnetostrictive transducer having a structure in which a DC bias magnetic field applying means
to an amorphous dual-type elastic body is provided in the vicinity of the elastic body in the
region where the conductive structure is provided. To briefly explain the theoretical background
concerning the main points of the present invention, FIG. 8 is a profile view of the magnetic field
distribution of the magnetic field that is inserted into the amorphous magnetostrictive thin plate
when current is supplied to the conductive structure. Here, turn back チ P = 1. Amorphous
magnetostrictive elastic plate thickness t = 0.1. The case is shown where the conductive structure
width 111 = 0.5, and the number of turns back to 11 = 11. The curves shown by parameters 100
and 200.300 are isomagnetic field lines for the longitudinal magnetic field component of the
04-05-2019
2
amorphous magnetostrictive elastic thin plate. The variation of the longitudinal magnetic field
component in the direction of the amorphous magnetostrictive elastic thin plate thickness μ is
the largest at the center of the width of one of the lines of the conductive structure EndPage: 2
bodies. In addition, in addition to the volume strain in the longitudinal direction of the
amorphous strain elastic thin plate, the same baldness also generates one bending strain
component. Due to this bending strain component, concentration of bending strain occurs on the
side of the plane in contact with the conductive structure, and a surface wave is generated. FIG. 9
shows the state of the water separation, in which the variation in the thickness direction
component of the longitudinal magnetic field component with respect to the ratio of the
thickness of the amorphous magnetostrictive elastic thin plate t to the width of the conductive
structure W) − The relationship between the coordinate axes of the amorphous bipositive elastic
thin sheet longitudinal direction with the xI conductive structure width center point as the origin.
Therefore, according to the present invention, an amorphous magnetostrictive thin plate has a
very small thickness 1 of about several tens of microns 1. The ratio It / I of the thickness t to the
width W of the conductive structure is at least 1 at all, and the variation lid> 0.1 strain energy is
concentrated on the surface layer of the amorphous magnetostrictive elastic thin plate In
addition, it has a uniform distribution in the thickness direction, that is, it is different from a
surface acoustic wave element that concentrates strain energy on the surface layer as 0'4> 5
used as a volume strain wave 0 or less An embodiment of an amorphous magnetostrictive
transducer according to the present invention will be described with reference to the drawings.
In FIG. 10, on an amorphous magnetostrictive thin plate 1, a conductive structure 6 (hereinafter
referred to as a zigzag coil) and a bias magnetic field applying means 7 are provided alternately
folded back at substantially -foot intervals. It is.
Amorphous magnetostrictive transducer
The means 7 for applying a bias magnetic field may be either the same side of the zigzag coil 6
or the opposite side, close contact, or close proximity. The present invention will be described in
detail. FIG. 11 is a characteristic diagram showing the magnetostriction amount-magnetic field
characteristic of the amorphous magnetostrictive thin plate 1. The operation point of the bias
magnetic field is set at point A in FIG. Now, when a high frequency current is supplied to the
serpentine coil 6, a high frequency magnetic field according to the footing of the unveiling is
generated around the folding path of the same serpentine coil 6 · 7 ·. Looking at this at a certain
moment, the magnetic field distribution is positive and negative as the bias magnetic center as
shown in FIG. 12 according to the turn of the turn-back coil 6 in the longitudinal direction of the
turn-back coil 6 as shown in FIG. Alternating in the direction of Due to this magnetic field, the
04-05-2019
3
amorphous magnetostrictive thin plate 1 at the installation portion of the zigzag coil 6 causes
low distortion due to the Zeal effect. The magnetostrictive pulse group corresponding to the
folding and the folding interval of the winding 6 can be excited as shown in FIG. If the thickness t
of the amorphous magnetostrictive thin plate is at least t <w with respect to the width W of the
turnback path of the coil 6, the bulk longitudinal wave mode of the amorphous magnetostrictive
thin plate 1 is obtained. Although the case has been described above where the electrical signal is
replaced with a bulk longitudinal wave mode strain elastic pulse group in a desired positional
relationship, the reverse strain elastic pulse group is an electrical signal, 8. Can be converted to
In one of the folding paths of the serpentine coil 6, a pulsative effect. That is, an induced voltage
is generated due to a flux linkage that excites one magnetostrictive elastic pulse. Since the output
of the serpentine coil 6 is a combination of voltages of the respective turnaround paths, the
sensitivity is maximum for magnetostrictive elastic pulse groups in a positional relationship that
matches the geometrical shape and size of the serpentine coil. As described above, according to
the embodiment of the present invention, an electroacoustic transducer for exciting an elastic
pulse group having the same number of turns as the number of turns and an elastic wave group
having the same number as the number of turns, An acousto-electric converter which achieves
maximum sensitivity to the elastic pulse group in the above can be realized without using a
plurality of solenoid coils or magnetic heads. Moreover, the serpentine coil is smaller than a
solenoid coil or a magnetic head, and it is easy to make a minute coil, and the frequency range of
the elastic wave can be expanded. The present invention will be the basic technology of EndPage:
3 signal processing devices in the telecommunications field of amorphous magnetostrictive
materials.
4. Brief description of the drawings FIGS. 1 to 5 are structural views of a conventional
transducer. FIG. 6 is a structural diagram of a conventional amorphous magnetostrictive
transducer. FIG. 7 is a view showing a state of 1 drive of FIG. 6, and FIG. 8 is a view showing a
magnetic field distribution of an amorphous magnetostrictive thin plate. FIG. 9 shows the ratio of
W to amorphous magnetostrictive thin plate thickness t in the conductive structure, and B and
the magnetic field unevenness. FIG. 10 shows the amorphous magnetostrictive elastic thin plate
according to the present invention and the serpentine coil. FIG. 6 shows an embodiment of a
magnetostrictive transducer. FIG. 11 shows the magnetostriction amount-self-rising
characteristics of the amorphous magnetostrictive thin plate. FIG. 12 is a diagram showing the
driving state of FIG. 1: Amorphous 凪 strain thin plate, 2: 1 solenoid coil, 6: 1 magnetic helix, 4:
plural solenoid coils, 5: plural magnetic heads, 6; zigzag coil, 7: bias magnetic field Application
means. Attorney Attorneys Attorney-Minute 1) O. I. I. · 11 · / l '1 Figure 7 λ Figure 3' Figure 10
Figure f Figure 5 Figure 12? 6 Figure 70 Woman? Direction Tsu! EndPage: 4 o 8 λ go θ, 77 /
θ 炒 10 EndPage: 5
04-05-2019
4