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1. Title of the invention 3, Patent applicant address Otemachi, Chiyoda-ku, Tokyo-5th No. 2,
Chiyoda-ku, Tokyo Location: No. 40, Shibahiradairacho, Minato-ku, Tokyo 19 Mori (Paddy)
Building 3rd floor ■ Japan Patent Office '0 JP-A 52-58,496, 8 2, 2 g (bright, thin, ultrasonic
magnetostrictive vibrator light magnetostrictive vibrator fixed with πJ-type material of
ultrasonic magnetostrictive vibrator. Ultrasonic magnetostrictive vibrator characterized by the
present invention Is an improvement of the π-type magnetite ferrite magnetostrictive oscillator.
-'Conventional, ferrite magnetostriction! It is used to emit ultrasonic waves with moving
elements. As 1-shapes, there are shapes called π-type and NA-type, and in particular, π-types
are often used from the advantages of incorporation. Generally, as shown in FIG. 1 in a schematic
perspective view, the π-type ferrite magnetostrictive limiter has the bias magnet 2 inserted
between the tips of its π-type legs 1.1, and the legs The plate-like member 3 made of sponge
rubber is bonded to the tip end face and the magnet with an adhesive so as to control the
movement of the magnet, but the ferrite constituting the magnetostrictive vibrator is As it is a
porcelain material, breakage is likely to occur when it is used in bulk output, and in particular the
π-type leg 1. Cracks 4 ′ ′ as shown in the figure at the neck of the work are generated, and
breakage from the surface □ often occurs. It is necessary to prevent breakage of these necks.
In addition, although various attempts have been made to devise the shape of the neck portion, at
present, no satisfactory solution has yet been obtained. From the viewpoint as described above,
the inventors of the present invention have studied the vibration aspect (((EndPage: 1 as a result
of examination about the conventional π-type ferrite magnetostrictive vibrator, as shown in FIG.
Not only a single longitudinal vibration but also a multiple vibration, and it was found that a very
large tuning fork type lateral vibration H was generated particularly at the tip of the π-type leg 1
° 1. If, for example, a 28 KHz π-type ferrite magnetostrictive oscillator produces a vibration
with a longitudinal amplitude of 13μ at an input of 100 W unloaded, the lateral amplitude due
to the tuning fork-type lateral vibration at the tip of the π-type leg reaches about μμ As a
result, the stress applied to the neck portion of the π-type leg is about 3.2 × 10′dyn / 7 or
more, and it is concluded that it is believed that this causes breakage in the neck portion.
Therefore, the present invention has been made based on the above-described findings and fixes
the tip of the π-type leg portion of the π-type ferrite magnetostrictive vibrator with a
nonmagnetic material which does not affect the magnetic circuit by the bias magnet. Thus, the
present invention is characterized by fcLf to suppress the lateral amplitude due to the tuning
fork-type lateral vibration and prevent the occurrence of breakage in the π type leg.
In the π-type ferrite magnetostrictive vibrator of the present invention, the feature is that the
ferrite is made of magnetite ferrite. That is, in the conventional .pi.-type N1-cu ferrite
magnetostrictive vibrator having the structure shown in FIG. 1, the sponge plate member 3 which
is attached to the tip of the .pi.-type leg portion is a nonmagnetic material made of, for example, a
copper plate of thickness lfi. The sound pressure of the magnetostrictive vibrator thus
constructed, for example, 1 ook, measured in high pressure in water, and high load, was
determined by replacing it with a material, and the sound pressure was determined to be π Only
the sound pressure of about 60 × the sound pressure in the state where the mold leg tip is not
fixed by the copper plate was shown. On the other hand, when the sound pressure was measured
under the same conditions except that the N1-cu ferrite was replaced with the magnetite ferrite,
the magnetite ferrite magnetostrictive vibrator in the same manner did not fix the tip of the leg.
The sound pressure of about 95X of the sound pressure is shown, and the occurrence of
breakage is not completely seen even for a long time vibration of 1000 hours or more. As
described above, in the magnetite ferrite magnetostrictive 3-motion machine, the efficiency is
hardly reduced even if the end of the leg portion is fixed, while the Ni-Cu ferrite exhibits negative
magnetostriction, whereas the magnetite ferrite is negative. Since l− exhibits positive
magnetostriction, it is considered to be caused by the fact that the magnetostriction is not
reduced by the compressive load. The invention will now be illustrated by means of examples. In
Table 1, a stainless steel plate of thickness 11111 is used as a nonmagnetic material, and the tip
of the π-type leg is fixed with the stainless plate. No-load human power: longitudinal vibration
amplitude and tuning fork-type lateral vibration amplitude at 80 W and 100 WK are shown. The
same table also shows the measured values in the case of replacing and replacing the stainless
steel plate with a sponge member for comparison, as shown in Table 1 Table 1 Table 1 The
longitudinal vibration image amplitudes at 80 W and 100 W show exactly the same results for
both magnetostrictive vibrators, which indicates that the efficiency reduction due to the
application of the stainless steel plate is as low as # 1. On the other hand, in the tuning fork type
lateral vibration amplitude, there is a difference between both magnetostrictive vibrators, and in
the case of sponge member application, destruction did not occur at an input power of 80 W, but
at 100 W the destruction occurred at the neck portion of the π type leg did. On the other hand,
in the case of the present invention example, destruction occurs completely even if the input
power deviates, and as described above, in the magnetostrictive vibrator of the present invention,
the tip of the π-shaped leg portion is Since the tuning fork type lateral vibration generated in the
unit is extremely reduced, there is no possibility that the EndPage: 2 breakage occurs during its
use, and industrially useful such as long-term use with high efficiency being possible due to
shackle. It has the following characteristics.
4. Brief Description of the Drawings FIG. 1 is a schematic perspective view of a conventional πtype ferrite magnetostrictive vibrator. In the drawing, 1 ··· π type leg, 2 · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · .... Longitudinal vibration, H ········ Tuning fork type lateral vibration. Applicant
Mitsubishi Mitsubishi Corp. Agent 1) Kazuo 7-5, list of attached documents (1) 1 description (2)
1 drawing (3) proxy 1 (4) request Other than inventor or agent EndPage: 3