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JPS5453987

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DESCRIPTION JPS5453987
Description of the Invention Amorphous magnetostrictive transducer was constructed by
changing the number of conductors in a zigzag folded conductive structure formed by alternately
turning over all the thin film linear conductors so that the amount of current flowing varies
depending on the position of the amorphous magnetostrictive transducer. An amorphous
magnetostrictive transducer characterized in that the structure is placed on an amorphous
magnetostrictive elastic body surface.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electroacoustic,
acoustic wave transducer using amorphous magnetostrictive material sound. In recent years,
research on amorphous magnetic materials has progressed, and various development results
have been announced. In particular, US patent US Allite Chemical Co., Ltd. “Amorphous alloy is
used for ultrasonic wave itJ (Japanese IQ Sho 49-112551), amorphous alloy has a propagation
loss of l”. Very excellent ultrasonic wave It has been shown that it is a propagation medium and
that the amorphous alloy itself can be a magnetostrictive transducer. Also, Dr. Tsuya and Dr. Arai
of Tohoku University Research Institute of Electrical Communication, "Symposium Proceedings of
Amorphous Ferromagnetic Material J (August, 1977)," “The electromechanical coupling
coefficient in the amorphous ferromagnetic thin strip In J (1-7) and “Ultrasonic Continuous
Variable Delay Phenomena in Amorphous and Ferromagnetic Thin Strip” (1-9), a large
magnetostriction constant of 80 × 10 in an amorphous magnetic material and a conventional
one of 0.65 have not been used. Some have high electromechanical coupling coefficients,
revealing that the amorphous magnetic material itself is an excellent magnetostrictive
transducer. As shown in FIG. 1, these transducers are I) K amorphous magnetostrictive thin plate
wound with an enrenoid coil, or as shown in FIG. Further, as shown in FIG. 8, a substantially
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uniform magnetic field is generated in the longitudinal direction of the amorphous
magnetostrictive thin plate by a coil or magnetic head as shown in FIG. In some cases, elastic
wave full excitation corresponding to an input electrical signal is obtained. However, in the field
of signal processing in telecommunications, these transducers have an elastic wave pulse such as
to have a plurality of simultaneous and desired positional relationships [6] for one electrical
input signal pulse. It is not suitable for the application of exciting the group to the amorphous
magnetostrictive thin plate. 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. Only one elastic wave can be excited for one solenoid
coil or magnetic head. For this reason, in order to excite elastic waves in a plurality of desired
positional relationships, as shown in FIG. 4 to FIG. 6, a plurality of solenoid coils or magnetic
heads all have desired positional relationship with an amorphous magnetostrictive thin plate. It
must be installed to become The second reason is that it is difficult to realize a solenoid coil or
magnetic head having a length of 1 rrr n L or less even if the above-mentioned drawbacks are
achieved indebtedly, and it is difficult to excite a plurality of elastic waves at intervals of 1 vote or
less. It is difficult 0. Therefore, as a similar technology to excite a plurality of elastic waves in a
plurality of desired positional relationships, elastic surfaces with interdigital electrodes installed
on piezoelastic substrates such as Reteum Niobe (LzNhO2), quartz, etc. Surface acoustic wave
transducers are currently being developed in which serpentine-shaped electrodes are installed on
magnetostrictive elastic plates such as Y-wave transducers and Y-shaped λYAG, but these are all
techniques for surface acoustic waves, It requires an essentially different technology from that
used for bulk longitudinal wave phenomena.
The object of the present invention is to eliminate all the drawbacks of the prior art described
above in order to realize various application devices in the telecommunications field of
amorphous magnetostrictive material, and the position of each magnetostrictive elastic wave
pulse in the amorphous magnetostrictive thin plate is desired. A small size that can excite the
magnetostrictive elastic wave pulses in bulk longitudinal wave mode whose energy ratio is in the
desired relation, or can be weighted as desired for the magnetostrictive elastic wave pulses in
bulk longitudinal wave mode To provide a magnetostrictive elastic wave transducer which is fine
and easy to manufacture. The feature of the present invention is that the magnetostrictive elastic
body is made of amorphous magnetostrictive material gold which is obtained as a thin plate
having a large magnetostriction constant and an electromechanical coupling coefficient and a
thickness of several tens of microns, and can be alternately made small and fine. A
magnetostrictive elastic wave transducer is configured to have a structure in which a serpentinetype conductive structure is used to turn it into a structure in which the number of serpentine 9type coils is partially increased or decreased. Hereinafter, an embodiment of the amorphous
magnetostrictive transducer of the present invention will be described with reference to the
drawings. FIG. 6 (a) is a top view of a structure in which a zigzag folded conductive structure
(hereinafter referred to as a "folded coil") 4 is formed on an amorphous magnetostrictive thin
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plate 1 alternately folded back with a fixed width. The 0-fold folded coil 4 is placed 92 times or 8
times or more in multiples depending on the position on the amorphous magnetostrictive thin
plate 1 in the folded back path, and electrically connected in series. Operation 4 of the
amorphous magnetostrictive transducer of the present invention will be described. Now, when a
pulse current flows between the electric terminals 5 and 5, a pulse magnetic field is generated in
accordance with Ampere's theorem at each turn of each folded path of the zigzag coil 4. At this
time, the magnetic field distribution is in accordance with the folding pitch along the longitudinal
direction of the zigzag coil 4 and the X direction, and as shown in FIG. 6 (b), the spiral coil in the
folding path. It is a magnetic field distribution in which the size is proportional to the number of
lines of 4 and is alternately directed to positive and negative. The magnetostrictive noise is
produced in the amorphous magnetostrictive thin plate 1 at the installation portion of the
serpentine coil 4 'due to the Joule effect of the magnetic field. As shown in the well-known
magnetostriction-magnetic field characteristics, the magnetostriction amount does not depend on
the direction of the magnetic field, and the absolute value of the magnetostriction amount
indicates that the amorphous magnetostriction thin plate 1 The magnetostrictive pulse group
corresponding to Y.sub.2 is excited as shown in FIG. Since the elastic energy of magnetostriction
is proportional to the amount of displacement, the folding width of the zigzag coil 4 in the
present embodiment is constant, and therefore, as shown in FIG. 6C, the spiral coil 4EndPage: 2 It
is proportional to the number at each position in each turnaround path.
As described above, by changing the number of serpentine 9 type coils 4 according to the
position of the turnback path, the magnetostrictive elastic wave pulse of the desired energy ratio
of the positional relationship according to the turnaround distance of the serpentine type coil 4
Groups will be obtained. In the above, the case where electric signals are converted into
magnetostrictive elastic wave pulse groups in which the ratio of each elastic energy is in a
desired relation in a desired positional relationship has been described, but conversely, the
magnetostrictive elastic wave pulse It is also possible to perform conversion and convert it into
electric signal pulse groups. In one of the folded back paths of the serpentine coil 4, a guilar
effect, that is, an induced voltage due to a linkage flux excited by one magnetostrictive elastic
wave pulse is generated. Since the induced voltage is proportional to the number of serpentine 9
type coils 4 at the position of a certain turning path, the desired weighting for the
magnetostrictive elastic wave pulse is equivalent to obtaining a gold electric signal pulse group
Get the effect. FIG. 7 shows another embodiment, which is installed on the back of a part of the
gold amorphous magnetostrictive thin plate 1 of the serpentine type coil 4 to avoid that the
serpentine coil 4 has a multilayer structure. It is apparent that the same effect as the
embodiment of FIG. 6 is obtained when the thickness of the amorphous magnetostrictive thin
plate 1 is smaller than the folding distance of the serpentine-type coil 4. As described above,
according to the present invention, each elastic wave pulse has a desired positional relationship
with respect to an electric signal pulse, and a desired weight for elastic energy excites a group of
elastic wave pulses. An amorphous magnetostrictive elastic wave transducer that applies desired
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weighting to elastic wave pulses and converts them into electric signal pulse groups can be easily
realized without using a plurality of solenoid coils or magnetic heads as exemplified in the prior
art. It is clear that it can be 0
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 6 are structural explanatory views of a
conventional magnetostrictive transducer, and FIG. 6.7 is an upper surface structural explanatory
view showing an embodiment of a magnetostrictive 7 transducer according to the present
invention. l: amorphous magnetostrictive thin plate, 2: solenoid coil, 8: magnetic head, 4:
serpentine #) coil, 5.5 ': electrical terminal. Attorney Attorney Attorney Thin EE1 Speech 8 years
old 1121 years old 2 figures 2 years old 3 Cabinet Fang + 悶 May EndPage: 3
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