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JPS56137592

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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
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DESCRIPTION JPS56137592
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a curve diagram showing the relationship
between the magnetostatic strain of a magnetite and Ni-Cu ferrite and the strength of a magnetic
field in relation to a compressive load, and FIG. 2 is an embodiment of this invention. FIG. 3 is a
perspective view of the shown assembly, FIG. 3 is a side view of the vibrator shown in the
embodiment of the present invention, and FIGS. 4a and 4b are a plan view and a longitudinal
sectional view showing another embodiment of the vibrator of the present invention. FIG. In the
drawings, 1.1 ? иии magnetostrictive material, 2, 2 ? иии bias magnet, 3.3 ? ?, 3 ? ? иии yoke
material, 4 иии clamping plate, 5 иии screw , 6 ... winding.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ultrasonic
ferrite vibrator having excellent ultrasonic vibration characteristics-in general, ferrite is N +, Cu, C
? in iron oxide powder. Mix oxide powders of elements such as Mg, Mn, and Ba 1- / Complete t)
q? 2) The mixed powder is formed by the usual powder metallurgy method and has a
composition of the general formula MO и Fe 2 O 3 1 of these ferrites, which is mainly used as a
magnetostrictive vibrator, as M One of the above-mentioned Ni-Cu ferrite magnetostrictive
vibrators, which has N + and CH based N + -Ctt ferrites, has excellent electric and magnetic
characteristics and good ultrasonic conversion efficiency as compared with metal
magnetostrictive vibrators, even at low cost. Because of their existence, they are widely used in
ultrasonic application devices such as ultrasonic cleaners and ultrasonic processors. As described
above, while ferrite magnetostrictive vibrators have various excellent characteristics as compared
with metal magnetostrictive vibrators, they are porcelains and therefore their mechanical
strength is inferior to that of metal magnetostrictive vibrators, and they are further processed by
When connecting to vibration transmitters such as metal horns and cleaning tanks, since it can
not be brazed or attached, an organic adhesive such as epoxy resin must be used for the
connection. In such a connection, the adhesive is significantly deteriorated at the time of large
amplitude vibration, and as a result, the adhesive surface peels off, causing the transducer to
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become non-loaded to become 2-, leading to breakage. From the above viewpoint, the inventor of
the present invention has an ultrasonic ferrite vibrator which has high mechanical strength and
can be mechanically attached to an ultrasonic application device without damaging the
characteristics of the ferrite magnetostrictive material. As a result of research to obtain, it was
possible to conclude the following things. That is, (1) Ferrite is weak against tensile stress but has
ten times or more strength against tensile stress, so fracture of ferrite in vibration that is a
repetition of tension and compression is tensile. In order to improve the mechanical strength of
the ferrite against vibration, it is believed that this is caused by the force, so that the ferrite
material is pre-stressed and the ferrite material is compressed. It is sufficient that the ferrite
material is vibrated by sonication so that a large tensile force is not applied to the ferrite material
at the time of the vibration 1, (2) Ni-Cu based ferrite commercially available based on the matters
described in the item (1). When the static magnetostrictive strain change against load is
measured against the load, the results shown in FIG. 1 are shown, and as shown in the figure,
negative magnetostatic strain is also obtained. The mechanical strengthening means described in
the above item (1) is the Nj-Cu, since the amount of negative magnetostriction is significantly
reduced when a compressive pressure is applied to the N1-C (system 1 ferrite. Not applicable to
ferrites.
(3) On the other hand, as described in the invention filed by the same applicant as Japanese
Patent Application No. 48-'76132 and Japanese Patent Application No. , Zn, Ca, Ba, Sr. In a
magnetite ferrite containing one or more elements of Pb, AQ, Zn, 'I'i, and Go in the form of an
oxide, the reverse of the above N1-C + и ferrite. Showed a trend. That is, as shown in FIG. 1, in the
case of magnetite ferrite having positive magnetostatic strain characteristics, the amount of
magnetostatic strain when the strength of the magnetic field is increased is the direction in which
the magnetic field is applied as compared to the case of no load condition. The case where the
compressive load of '00 kg / crd is applied is larger, and this indicates that the magnetostatic
strain amount is rather increased when the magnetite ferrite is tightened by bolting or the like.
This device was made based on the above conclusion, and arranged an assembly consisting of
magnetite ferrite magnetostrictive material having positive magnetostatic strain characteristics, a
bias magnet, and a yoke material so as to form a magnetically closed circuit. Improves the
mechanical strength against vibration 1 by integrally attaching a jig for compressing the
assembly in the image pickup direction by preventing a shallow portion of the bias magnetic field
by To an ultrasonic ferrite vibrator capable of mechanically connecting to an ultrasonic
application apparatus through the compression jig while measuring an increase in quantity,
stabilization of imaging against fluctuation of external load, and measurement of amplitude. It
has a feature. In general, in a ferrite vibrator, the optimum bias magnetic field is located near the
maximum change in magnetostatic strain due to the magnetic field or at a position slightly higher
than that, for example, the magnetite 5-to system shown in FIG. In the ferrite, the optimum bias
magnetic field is the optimum p at a bias magnetic field of 5 to 10 oersteds in the no-load state,
and the 20 to 30 o'clock in the 9 / i compression load state at 400 to the optimum applied
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magnetic field. As described above, in the ultrasonic ferrite vibrator of the present invention, by
applying a compressive pressure to the ferrite vibrator, the optimum bias magnetic field of the
vibrator can be made high to enable large amplitude excitation. Moreover, by forming a closed
circuit using a yoke material, the shallow portion of the bias magnetic field is prevented to
effectively use the magnetic field as much as possible. Next, a ferrite vibrator of this invention
will be described by means of comparative test examples. The following five types of ferrite
oscillators for test were prepared.
(A) As shown in a perspective view in FIG. 2, each of the upper and lower surface dimensions of
the rectangular magnetite ferrite magnetostrictive material l having a size of 15 О 25 and a
length of 70 ?m is different at each side Of the magnetostrictive material l and the bias 6magnet 2 is a sandwich made of ferromagnetic iron yoke material 3 consisting of 5 mm in width,
25 mg in depth and 70 m1 in length. I formed a group to take this idea. The duralmin mounting
with a thickness of 10 mm abuts the plate 4 on the upper and lower end faces in the vibration
direction of the assembly magnetically arranged to form a closed circuit in this manner, as shown
in a side view in FIG. In order to tighten the yoke material 3 with the six 4 mm diameter stainless
steel screws 5 of ten in total, the compression force of 300 kg / ffl is applied to the
magnetostrictive material 1 by tightening the yoke material 3, thereby causing the
magnetostriction (13) In the above-mentioned vibrator (A), the magnetite ferrite magnetostrictive
material is replaced with a Ni-Cu ferrite magnetostrictive material in the above-mentioned
vibrator (A). Were prepared as comparative vibrator 0) (C) In the above vibrator (A), a clamp was
prepared as comparative vibrator (C) without providing a magnetostrictive material compression
jig consisting of a plate and a screw. . (D) In the vibrator (B), as in the case of the vibrator (C), one
provided with no tool for compressing a magnetostrictive material was prepared as a
comparative vibrator-(2 '). (E) In the above-mentioned vibrator ?), one in which a ferromagnetic
iron yoke material was replaced with a nonmagnetic brass yoke material was prepared as a
comparative vibrator (E). . When the input powers of 30 W and 10011 J were added to the five
types of transducers (A) to (E) in the absence of air in air, the amplitudes shown in the following
table were obtained. Vibrator type 3 OW amplitude 100 W amplitude A5 ?m 14 ?m BOO 48 W
destruction C 6 ?m amplitude 8 ?m 51 W destruction D 6 ?m amplitude 9 ? wind F 3 ?m 8
?m The vibration amplitude in the above table was measured by an optical microscope. As
shown in the above table, in the vibrator (, A) according to the present invention, the maximum
amplitude 14 ?m at the time of lOOOW input is 8-8 and can be large amplitude excitation
without destruction but compression pressure The comparison oscillators ?) and (D) show
somewhat higher amplitude than the oscillator (A) at destruction, but they break at input power
of 48 W and 51 W respectively, and the amplitude at break is 8 ?m and It only showed 9 ?m.
This indicates that the comparison transducers (C) and (r) are successfully applied as high-power
ultrasound transducers requiring large amplitude excitation. Further, in the comparative vibrator
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(B) to which the compression pressure is applied, almost no vibration occurs due to the negative
magnetostatic strain characteristic of the Ni?Cu ferrite, and it can not be used as a vibrator.
Furthermore, in the comparative oscillator using a nonmagnetic brass yoke material @), although
the compression effect of tightening appears and breakage occurs, the assembly does not form a
closed circuit magnetically, so the bias magnetic field In other words, in Figures 4 (a) and 4 (b),
there are other implementations of the transducer of this invention. An example is shown in plan
and longitudinal cross-sectional views. As shown, the upper and lower end portions of a
cylindrical magnetostrictive material 1 'made of magnetite ferrite having an outer diameter of 35
ii.phi., An inner diameter of 20 mm, and a length of 351 + 11 are made of Ba ferrite having a
thickness of 3 am. The bias magnet 2 is overlapped, and the magnetostrictive material 1 'and the
bias magnet 2' are sandwiched in a sandwich manner from both sides by a ferromagnetic iron
disk-like yoke material 3 'acting as a compression jig, the yoke material Screws formed on both
ends of a yoke member 3 ? of ferromagnetic iron bolt disposed through the center of the
magnetostrictive material 1 ? and the bias magnet 2 ? are screwed onto a label provided inside
the center of the 3 '. Then, the magnetostrictive material 1 'and the bias magnet 2' are tightened
at a compression pressure of 300 kg 77 to form a closed circuit assembly magnetically, and
further, the outer peripheral surface of the magnetostrictive material 1 'is Were prepared
vibrator of the invention is subjected to 50 times of the winding 6. In the vibrator of this
invention having the above-mentioned structure, even though the excitation (high frequency)
magnetic field is not in a closed circuit, it is broken at 4 .mu.m and 100 W with no load in air and
an input pressure of 30 W in air. (The amplitude of 1110-?m is shown respectively. In the
ultrasonic ferrite vibrator of the present invention, the form of the closed circuit of the
compression jig and the assembly is not limited to that shown in the above embodiment, but the
magnetostrictive material forming the assembly, bias The number of magnets and yoke materials,
the shape, and the form of the closed circuit may be changed as necessary, and the compression
jig may be any one as long as the assembly can be compressed in the vibration direction. Of
course, as described above, according to the ultrasonic ferrite vibrator of the present invention,
the mechanical strength against vibration, the increase in the amount of saturation
magnetostriction, the fluctuation of the external load may be used. Vibration stabilization,
mechanical connection to ultrasonic application equipment through a compression jig, large
amplitude excitation, and the assembly is formed as a magnetically closed circuit, so that unit
area Ah Rinotori 11 put out ultrasound becomes powerful thing, is a particularly potent
ultrasound for use in pulsed manner the sheet out object therefore of being brought practically
very useful effects such as optimal. .
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