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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
financial decisions, should not be based on machine-translation output.
The present invention relates to a frequency adjustment method of an ultrasonic transmitterreceiver. Conventionally, various methods have been proposed for adjusting the resonance
frequency of the vibrator, but the typical one is that the physical quantity is changed by
mechanical grinding of the vibrator itself, or The apparent cost was to increase the number of
purchases by applying an additive substance to the vibrator. However, in the former case, it was
impossible to adjust the resonance frequency accurately while performing the polishing
operation because the vibrator generates heat during polishing and the resonance frequency of
the vibrator drifts due to the heat quantity of the vibrator. . On the other hand, in the case of the
latter, since the vibrator performs strong mechanical vibration at the time of use for that
purpose, the substance added for adjusting the frequency is the same as that of the ultrasonic
cleaning tank just by ultrasonic vibration. There is a risk of falling off like dirt on an accessory.
As a result of various studies in these respects, the present invention has been provided. In
principle, the resonance frequency of the vibrating body is adjusted by fixing a part of the
vibrating body and adjusting the dimensions of the movable portion. For this purpose, it is a
polymer-based material that can be deformed relatively easily by pressure, or a support made of
materials such as copper, lead, tin, aluminum, zinc, etc. and their alloys. And supports at least one
side of the outer peripheral portion of the disk-shaped vibrator, or the rectangular diaphragm. In
this case, as shown in FIG. 1 a, a cross-sectional view in the case of a disk-shaped vibrator is
obtained by joining a disk 10 and an metallic plate 11 which are made of ferroelectric
piezoelectric elements and have electrodes on both sides. The outer peripheral portion 12-1 of
the vibrator 12 is supported by two 0 (e) rings 13-1.13-2 and inserted into the die 15 for the
purpose of preventing abnormal deformation of the housing 14, and then from above and below
The resonance frequency is detected from the terminal 20 of the object to be adjusted while
applying the pressing force P as shown by the arrow by the punch 16.17, and even when the
pressing forces of the upper and lower punches are removed when reaching a predetermined
frequency, Since the shaft 14-1 of the housing is completely squeezed by the upper end 17-1 of
the lower punch, the pressure-deformed 0 ring 13-1.13-2 is adjusted to a predetermined
frequency. It will be in the state stored in the coffin housing of a state. In the case of
automatically making these frequency adjustments, it is easy by arranging a sequence to remove
the pressing force P when the frequency of the object to be adjusted reaches the predetermined
resonance frequency in advance. Is a general technical tool in these industries, so I will leave it
out. FIG. 1 is a cross-sectional view of an ultrasonic transmitter-receiver whose frequency is
adjusted in the same manner as described above, but the structural difference is that the meat
mounted on the inner base of the housing 14 is -C. The support 13 placed on the head of the
thick ring 18 is composed of a soft metal ring, and the peripheral part of the vibrator 12
composed of the diaphragm 11 and the piezoelectric plate 10 is a housing Because of the
electrical contact, only the hot side terminal 20H is connected from the electrode through the
lead wire.
As a specific example, the outer peripheral portion of the vibrator 12 made of a material having
an outer diameter of 14111 + 1φ, a thickness of 0.2 square, and an outer diameter of the
diaphragm 11 of 20 mm and a thickness of 0.1 mm As shown in Fig. 1 P, the diameter of the air
cylinder is 50 mm, as shown in Fig. 1 P. In other words, when the pressure was increased to 0 to
78.5 kg, the pressure versus its dependent frequency characteristics as shown in FIG. 3 a could
be obtained. . Furthermore, in the same manner, as shown in FIG. 2, the condition of the support
is shown by using a flat support at the lower part, and at the upper part, the characteristic shown
by the curve shown in FIG. I got Finally, FIG. 3C shows a characteristic curve in the case where
the support surface of the lower support is provided with a recess as shown in FIG. 2C. From this
result, the displacement (adjustment width) of the frequency is the smallest in the case of using
two 0 rings, and the one in which one 0 ring is used together with the next flat support is ranked.
What is greatly different from these two is the C curve, but in this case, it is considered that the
outer peripheral portion of the vibrator is inserted into the recess by the 0 ring and tension is
applied. As described above, in the trigonality, an outer peripheral portion (or at least one side in
the case of a rectangular shape) of the resonator according to the present invention, a ring (a
plate or a square in the case of a rectangular shape) made of a material deformed by pressure. It
turned out that it is possible to adjust the resonant frequency of the vibrator by supporting and
pressing with a rectangular plate. In the present description, although the square type
embodiment has been omitted, the supporting object is deformed by the application of pressure
according to the principle of the present invention, and the size of the portion which determines
the vibration mode of the oscillator changes. Do. As a result, the fact that the resonance
frequency is adjusted is demonstrated in the case of a circular vibrator, and in particular, it is a
margin that does not require an explanation of the square shape. As described in detail in 1-1
below, according to the present invention, since it is possible to adjust the frequency extremely
easily, it is worthwhile to make the ultrasonic transceiver having the inexpensive and accurate
frequency characteristics to be manufactured industrially.
Brief description of the drawings
1a and 1b show cross-sectional views of the ultrasonic transmitter-receiver according to the
present invention, and the number 10 piezoelectric disk, 11 diaphragm, 12 vibrators, 13
supports, respectively. Show.
The second ryJa, b and c show the condition of the support, and the number gauge is the same as
the surface view. FIGS. 3a, 3b and 3c show the change in pressure and resonance frequency for
each condition of the support.
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description, jps62194800
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