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JPS55146800

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DESCRIPTION JPS55146800
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembled perspective view of an ultrasonic
transducer using a conventional π-type magnetostrictive transducer, and FIG. 2 shows an
impedance-frequency characteristic of the transducer. 3 is a cross-sectional view of a π-type
magnetostrictive vibrator according to the present invention, FIG. 4 is a glove showing the
relationship between 1 / L and impedance ratio, and FIGS. 5 and 6 show each characteristic of
the embodiment. It is. -1 · · · · π type vibrator, 11 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · Excitation coil.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the lay of
magnetostrictive transducers. Magnetostrictive transducers formed by ferrite are used as
ultrasonic transducers with high performance and low loss, such as ultrasonic cleaning, cooking,
ultrasonic transducers, or fish finders. In these ultrasonic transducers, as shown in FIG. 1, the
permanent magnet 2 is inserted into the leg portion 11 of the .pi.-type magnetostrictive
transducer l molded of Ni--Cu ferrite, and the carp (1) /4.6 J # 'Le 3 was wound and biased. In
the prior art, it is assumed that t = 0.2 L, assuming that the total length and l head speed of the
head 5B12 are t. However, as shown in the impedance Z- in FIG. 2 and in the form of f7, they
have almost the same inductance level, but the circumstantial temporary Mfr Tfr2 exists in close
proximity, and as an ultrasonic book facet 4 for stools. -The evils of each were born. The present
invention has been made to eliminate such drawbacks. The present invention is a π-shaped 虱
strain pregnant female. Let L be the total length of the thick head of the head and the length of
the leg, and t be the thickness of one head. ! It is a magnetostrictive mover characterized in that
one is 0.03 to 0.13, and the couscous suiriasu close to him is around. As for the embodiment of
the present invention as described above, N.1 will ask for details 54 in detail. FIG. 3 shows the
structure of the π-type value strain oscillation completed according to the present invention. The
total length is 9 and the thickness of the head 12 (2) is t / 7. L) and 1-0.13. With such a method
ratio, it is possible to measure the vertical movement of the entire longitudinal direction (a
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direction in the figure) and the vertical vibration of the head 12 in the direction perpendicular to
the a direction (1 ′ ′-4). Uh. The shaking force of the head 12 (in the direction shown in the
figure) is large.]-It is picked up, and a vertical vibration occurs only in the entire length direction
(a direction), resulting in noise As the anti-kinetic movement J'-, only the vertical vibration is
transmitted in the length direction 1 of the whole, and it is submitted. / 1 〈な っ て な っ て な
っ て. Dog 7iiii Example Ni-Cu ferrite molded π-type vibration exciter used for molding, length of
head 12 of this finger moving element is 27 mm, width (size 133, t / L, l10.2 Met. The
impedance Z of this oscillator and its 冑 (反 f special order (Z-f! Then, 4 heads are polished, t / L
is changed variously, and Z-f custom-made is further determined. Furthermore, the tocoils (1
figure 3) to Yanagi Iill of this 1 prefecture were respectively put in 1511, and were incorporated
into a 500 Ω constant current lα path, and measured by a person with I (3) frequency
measuring device.
FIG. 4 shows a change in t / L at this time, and impedances of the resonance layer wave number
fr1 and the resonance frequency f, 2 and bells as Zri and Zr2, respectively. In practice, it was
found that when 20 Aog 2 r ′ ′ / 2 r + (dB) was required to be 1 O dB or more, and 1 / L was
−0, 13 or less, it became 1 O dB or more. FIG. 5 shows the impedance z-round frequency f
characteristics at t / L = 0.20 and at t / L 0.06. At tA-0 and 20, both frequencies are frl and fr2,
and by setting 1/1 = 006, rj is a very small vibration of only gfr2? It is clear that As described
above, according to the present invention, when LA = 0.03 to 0.13, the spurious ratio is greatly
improved, so that the ratio of installation of each weir and the reliability of the river apparatus
can be greatly improved. In addition J! The reason why 7'L is limited to 0.03 to 0.13 is that
201og "71 r1" can not be obtained by 1 OdB or more when t / L is larger than 0.13, while with /,
/ L or 0.03 or less This is because the length 乙 of the head is small and the mechanical strength
is small (4), which is not suitable for practical use.
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