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Description as the title of the invention
Ultrasonic transducer
Detailed Description of the Invention The present invention relates to cleaning, mixing,
dispersing and cutting of chemicals, plastic working, welding, etc. The present invention relates
to an ultrasonic transducer widely used in Materials used as electrostrictive porcelains of this
kind, ultrasonic transducers are usually barium titanate, lead zirconate titanate, etc. These O
electrostrictive porcelain materials have positive characteristics in capacity-temperature
characteristics (FIG. 1) (See Reference), the capacitance of the electrostrictive porcelain also
changes due to temperature change due to local temperature change or self-heating, which
causes impedance mismatch with the high-frequency oscillator that excites the vibrator, resulting
in output and efficiency There was a drawback that the The present invention relates to an
electrostrictive porcelain by connecting a capacitor having a negative capacitance-temperature
characteristic (refer to FIG. 3) electrically in series or in parallel to an electrostrictive porcelain
having positive capacitance-temperature and US resistance as described above. The present
invention provides an ultrasonic transducer capable of generating a high efficiency and stable
output by making the combined capacitance of a capacitor constant over a wide temperature
range and improving the matching with a high frequency oscillator, and the following description
will be given with reference to the drawings. Do. Fig. 1 shows that an electrostrictive porcelain
made of lead zirconate titanate / J is superimposed on the electrode plate 3 so that the
polarization directions are opposite to each other, and the metal of each of the electrostrictive
porcelains l and u is metal. Showing a well-known Langevin type vibrator in which the back plate
and the cover plate I are applied and these are integrally fixed by a fastening bolt, and between
the electrode @j and the back plate (or front surface '1 jlj) In the present invention, as shown in
FIG. 3 of the present invention, a capacitor t of negative characteristics whose capacitance
decreases with increasing temperature is supplied to the above-mentioned Langevin-type
vibrator. It is electrically connected in series as shown in FIG. 6A and electrically connected in
parallel as shown in FIG. EXPERIMENTAL EXAMPLE Lead zirconate titanate composition II, outer
diameter Jjsw φ × inner diameter / 18 φ × thickness! Electrostrictive porcelain l, two k pieces,
made of nickel, with an outer diameter of 3! ■ φ × inner diameter / 4A! MII size × 0. -One
electrode plate 3 and stainless steel with diameter J! Intestinal φ × long-8 pairs 0. Jurasses back
with the center hole #a of the cylinder body K12-dew phi of jml and Jutsunun made in diameter!
In a cylindrical body of W-x length J-II, a slope angle j "notched section jl) on the contact surface
side with electrostriction sll, screw diameter / Jmx pitch l × effective depth / J ■ L blind screw
hole! Bolted steel bolt t which is stacked on each other, and is screwed into the blind screw hole j
of the front plate through the center hole #a of the backing plate. A book in which a capacitor r
exhibiting a capacity-temperature coefficient of 1 2000 ppm 7 ° C. consisting of (Ba-Ca-8r) (TiZr-8n) On composition is electrically connected in parallel to a − type vibrator. An ultrasonic
transducer according to the invention is prepared, and the result of measuring the volume of the
transducer with respect to the temperature change from normal temperature to 1 ° C in the
heating chamber is shown in FIG.
The ultrasonic transducer according to the present invention connected to a capacitor exhibiting
a negative temperature coefficient as shown in FIG. It is understood that the capacity increase of
the sand electrostrictive porcelain is canceled by the negative coefficient. Although the case
where the capacitor is connected in parallel to the electrostriction 1111 is shown above, the
same effect can be obtained even when connected in series. Although the capacitor lII is
connected to one vibrator, one or more capacitors can be connected even when using a plurality
of vibrators. Also, as with the electrostrictive porcelain of the vibrator, the capacitor should be
placed near the vibrator or attached to a metal boot so that the papermaking capacity changes
with the ambient temperature, or combined with the electrostrictive porcelain integrally It is
needless to say that it is preferable to set the circuit conditions of the high-frequency oscillator,
which is preferably attached, in accordance with the characteristics of the capacitance −11
degree characteristics of the electrostrictive porcelain and the capacitor. As described above, the
ultrasonic transducer according to the present invention, in which the capacitor having the
capacitance-temperature characteristic is electrically connected in series or in parallel, is
uniformly connected over a wide temperature range regardless of changes in ambient
temperature. Therefore, even if the temperature changes during use, there is no worries to cause
impedance mismatch with the oscillator, and there is a large effect that a stable acoustic output
can be obtained. Therefore, the ultrasonic transducer of the present invention can be suitably
adopted for ultrasonic cleaning used under high temperature, and for ultrasonic welding used
under high amplitude and high output.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B each show an ultrasonic transducer
according to the present invention in a quarter sectional view. Fig. 2 Capacitance-temperature
characteristics of the electrostrictive element used in the ultrasonic transducer, Fig. 3 is a
capacitance-temperature characteristic of the capacitor used in the present invention, and Fig. Is
an ultra connected capacitor of negative characteristics. It is the figure which measured the
capacity | capacitance-temperature characteristic of a sound wave vibrator. The applicant Japan
Special Ceramics Co., Ltd. representative Shuji Ogawa EndPage: 2 Fig. 1 A 竿 1 B Fig. 2 Fig. 3 4
Fig. 10 + 060? 0/Do110シ:L1^L(°CンEndPage: 3
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