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JPS52162132

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DESCRIPTION JPS52162132
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a conventional magnetostrictive
vibrator, FIG. 2 is an explanatory view of the radiation range of ultrasonic waves in FIG. 1, and
FIG. 3 is one embodiment of the magnetostrictive vibrator of this invention. FIG. 4 is a front view
of an example and FIG. 4 is an explanatory view of an ultrasonic wave radiation range of FIG. 8
ииииии Vibrating element, 11 ииииииии DC charge bias magnet.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetostrictive
vibrator having an extended radiation range of ultrasonic waves by improving the resistance of a
DC magnetizing bias magnet. In general, when driving the magnetostrictive vibration element
with a high solid wave current, by applying a bias of direct current magnetization, the center of
the AC magnetic field can be moved to a range where the magnetostriction efficiency is good,
and an efficient magnetostriction effect can be performed. At present, as a magnet element, a .pi.type ferrite element or a large number (l-j) is used, and a bias magnet for direct current
magnetization is used as a magnet. ???????????? By the way, as shown in FIG. 1, a
conventional magnetic oscillator has a plurality of vibrating elements -f (2) arranged in each row
on a vibrating plate (1) made of one metal plate. To make all the vibration elements (2) generate
the same vibration, the DC magnetizing bias river macnet (3) is aligned at the same time with the
same polarity and the end of the vibration leg (4) And drive a periodontal current through the
excitation winding (5). In addition, since the winding direction of the excitation winding (5) is
reversed even if the polarity of the magnet (3) is reversed, the polarities of the magnet (3) are
substantially aligned in the same direction. It will be the same as. Therefore, when a plurality of
vibration elements (2) are excited in the direction I = ri-, the vibration elements (2) vibrate in
almost the same direction, even if there is a stir of the head. 2) as a J & dynamic system including
iii), a highly directional super-wave (6) as shown in FIG. 2 is emitted in the sound field. Therefore,
for example, in the case of using a magnetostrictive transducer in an ultrasonic cleaning device,
strong directivity can be obtained on the surface ?, but on the other hand, the radiation range of
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1
ultrasonic waves is narrow ( The part that can be cleaned and the part that can not be cleaned
can be (2) minutes. In addition, if it is necessary to prevent non-uniform cleaning, it is necessary
to supply the power of ultrasonic wave lukey or lower 1-1 which is supposed to be per unit
volume per medium volume, and the number of vibration elements (2) Many self-made faults.
This invention pays attention to the points as described above, and provides a magnetostrictive
transducer with a wide range of ultrasonic wave radiation without unevenness of the ultrasonic
wave effect without increasing the number of vibration elements. Will be described in detail with
FIGS. 3 and 4 showing one embodiment thereof. In FIG. 1, (7) is a diaphragm made of a single
metal plate such as a stainless steel thin plate, and (8) is arranged in a large number in each row
on the diaphragm (7) and is adhered to each other. . (9) is an excitation winding wound on the
vibration element (8) # Jll1] 1 o +, 0? is the same polarity in each row of the vibration element
(2), and reverse polarity every time the arrangement is changed So as to be a DC net for biasing
magnet netting interposed at the end of the vibrating leg (4). In the past, a large number of
vibrating element balls', arranged in parallel to the vibrating plate (7),-; In each column of 8),
since the polarity of the DC magnetization bias macnet 01) is reversed to the cross JT, DC
magnetism (yearly bias car j is reversed, and the efficiency of the magnetostrictive effect is good
? ? Since the direction of the excitation force is reversed, the vibration state is reversed in each
row, and a vibration system including the diaphragm (7) exhibits a complex vibrational state, not
a single vibrational state, As shown in FIG. 4, the weak directivity) ultrasonic wave ?2 is emitted,
and the range having the cleaning effect spreads, and the unevenness decreases. .
As described above, according to the magnetostrictive vibrator of the present invention, the
radiation range of the ultrasonic wave is broadened by reversing the polarity of the magnet for
direct current magnetization bias in each row of the vibrating element. The range is broadened
and radiation unevenness is reduced-by means of the small number of vibrating elements used
before, ultrasonic waves are emitted that have a wide range of radiation effects.
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