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JPS6276400

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DESCRIPTION JPS6276400
[0001]
(Industrial field of application) The present invention is a high frequency bolted Langevin type
vibration in a high frequency vibration system used at high frequency such as 70 KHz to 500
KHz and used for high sound wave welding such as plastic etc. It relates to the child. (Prior Art) A
Langeban-shaped vibrator in which both sides of a ring-shaped piezoelectric element are held
between the diameter of the element (a metal member having an approximate cross-sectional
shape and each center is fixed by bolting) It is rice used in the following frequency. It is
theoretically clear that the ratio of diameter to length is close to 1: 1, or exceeds that for high
frequency areas such as 70 KHz to 500 KHz, in which case the piezoelectric element In addition,
it is impossible to take out only the vibration in the longitudinal direction and it is impossible to
take out only the vibration in the longitudinal direction, and how to suppress the lateral vibration
(radial vibration) coupled to the longitudinal vibration is the biggest problem. However, the
research is not enough to the extent that two proposals are made as a countermeasure.
(Problems to be Solved by the Invention) In the Langevin type vibrator for high vibration, it is
necessary to increase the diameter of the piezoelectric element in order to extract the vibration
power such as 70 KHz to 500 KHz for ultrasonic welding etc. Since the radial vibration is coupled
to suppress the desired longitudinal vibration, it is often technically meaningless. In order to
avoid this, it is necessary to excite radial vibration in the piezoelectric element itself and to think
of a difficult %% shape. However, since development in this field has been totally neglected in the
past, it is recognized that development concerning the configuration of the above-mentioned
shape is necessary. This is the problem to be solved by the present invention. (Means for Solving
the Problems) The present invention is intended to solve the problems in + tij, and in a boltclamped Langevin type vibrator for high frequency, an appropriate number of cut in the radial
direction of the piezoelectric element Grooves are formed, and radial grooves are suppressed by
the grooves. FIG. 1 is a cross-sectional view of an embodiment of the present invention, and FIG.
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2 and FIG. 3 are a plan view and a side view of the lower piezoelectric element. FIG. 1 exemplifies
a Langevin type vibrator according to the present invention in which the target frequency is 133
KHz, and the piezoelectric element is formed by joining a lower piezoelectric element (1) and an
upper piezoelectric element (11) in two layers. Those piezoelectric elements (1) and (11) use
ring-shaped piezoelectric elements having an inner diameter of 20φ and an outer diameter of
39φ, and the lower and upper sides of the piezoelectric elements have the same diameter
unrustable metal members (2X) , (22), and the rustproof metal members (21), (22), the lower
piezoelectric element (1), and the upper piezoelectric element (11) are fastened together by bolts
(23).
Each of the piezoelectric elements <1) and <11) has a length of t3 ++ un, and a total length of 12
mm, and the lengths of the metal members (21) and <22) are 18 ° 81 each. The total length of
the piezoelectric elements <1) and (H) is 1⁄2 of the wavelength λ, and the vc of the metal
members (2t) and (22) is 1⁄2 of the wavelength λ. The length was adjusted to the wavelength
person. Radial notches (2) and (12) are provided on the joining corresponding surfaces of the
lower piezoelectric element (1) and the upper piezoelectric element (11), and they are vertically
aligned as shown in FIG. The number of incised grooves <2) and (12) is fjS2 as shown in Fig. 1
and Fig. 1, and two or four or eight appropriate numbers are provided at equal angular intervals,
and the depth of each of them is 3 points corresponding to 172 of thickness. (Operation of the
present invention) FIG. 3 is a diagram of a control vibrator prepared according to FIGS. 1 and 2
and 3 without using the cut groove of the present invention in the piezoelectric element, and FIG.
FIG. 6 is a diagram showing the results of examining the effect of the frequency characteristics of
free admittance on the vibrator of the present invention shown in FIG. 1 and FIG. The
measurement method was sweeping the frequency by fiz steps from 0 KIIz to 150 to llz by 50
with a YH, P impedance analyzer, and its phase and admittance trajectory were measured. Fig. 3
is an admittance characteristic diagram of a control in which the incised groove of the present
invention is not formed in the piezoelectric element <1), <11), and Figs. 4 to 6 are incised
grooves <2), (12) , And the piezoelectric elements (1) and 01) are respectively divided into two
parts and four parts, and FIG. In FIG. 3, radial vibration indicated by mark X is recorded as
unnecessary vibration near 88 K It Z and 97 K 11 z, but as shown in FIGS. 4 to 6, notched
grooves (2), (12) The number of specific resonances decreases steadily as the number of
increases in two, four and eight. The vicinity of 8Z KIIZ in FIGS. 3 to 6 is a resonance having one
wavelength, and 133 Kt (the vicinity of z is a design value. In the present invention, as described
above, only the piezoelectric element is subjected to the processing of the incised groove, and the
others are not treated as in the prior art, but the rustproof metals (21), (22) and pol It is expected
that the improvement of (23) can add a further improvement. (Effects) Since the present
invention is used in a high frequency region such as 70 Kllz-500 for a bolt-clamped Langevin
type vibrator for high frequency, it is difficult to extract high power due to mixing of radial
vibration of the piezoelectric element. It has an excellent effect that high power can be extracted
only by inserting a suitable number of radial grooves into the element, dividing it substantially,
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and applying a process to suppress or suppress radial vibration. .
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of an embodiment of the present invention, FIGS. 2 and 1 are a
plan view and a side view of the lower piezoelectric element, and FIG. 3 is a control vibrator in
which the piezoelectric element is not provided with a cut groove. 4 is an admittance
characteristic diagram of the vibrator of the present invention provided with two incised grooves,
and FIG. 5 is an admittance characteristic diagram of the present invention vibrator provided
with four incised grooves. FIG. 6 is a graph showing the characteristics of seven vibrators of the
present invention in which eight notches are provided.
Figure 1 Z Figure 2 I It Figure 3 Figure 4
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