JPS61157200

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DESCRIPTION JPS61157200
[0001]
[Industrial field of application] The present invention relates to a Langer-Pan vibrator having an
ultrasonic wave-irradiated surface which is held in a long and thin area by holding an
electrostrictive element by a pair of metal blocks consisting of a front plate and a back plate. is
there. "Prior art" A single disc-shaped electrostrictive porcelain plate is connected directly or
directly or in multiples via a terminal plate in series mechanically or in parallel electrically to
form an electrostrictive element, both main surfaces thereof The Langevin-type vibrator, in which
a pair of metal blocks are applied and stacked and fixed, is widely used in various devices, but the
conventional one has an equal cross-sectional shape of the pair of metal blocks and the
electrostrictive element. Load was too light and loss was large. Further, among metal blocks,
there is known one in which the front end face of the front plate to be irradiated with ultrasonic
waves is increased in diameter in a trumpet shape to increase the irradiation area, but also loss
can not be avoided. [Problems to be Solved by the Invention] At a height that is an integral
multiple of λ / 2, one metal block that exhibits a horizontally long prismatic shape is used as a
front plate that radiates vibration in the forward direction, and its longitudinal axis The
electrostrictive element and the other metal block called a backing plate are laminated on one or
more concave seating surfaces formed by cutting in the direction perpendicular to the horizontal
axis so as to exhibit the same surface as the upper end surface of the front plate. And the length
of an integral multiple of λ / 2 opposed to the concave seating surface in the direction
perpendicular to the horizontal axis which joins the front plate, and additionally locates the
laminate of the electrostrictive element and the backing plate. When the length of the portion
having the length increases, a through hole in the direction perpendicular to the long axis is
bored in the opposite portion. "Effective" Apply an appropriate acoustic load to the
electrostrictive element by making one metal block and the front plate laterally long prismatic,
and also make a hole perpendicular to the long axis in the front plate Thus, the transmission of
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the ultrasonic vibration to be irradiated forward in the direction of the transverse axis is blocked.
[Example] (1) FIG. 1 shows a basic embodiment of the Langevin-type vibrator of the present
invention, in which 1 is a lead zirconate titanate-based compound), respectively by silver baking
or the like on both main surfaces. A metallized electrode surface (not shown) is formed, and a
pair of polarized plate-like electrostrictive elements 11.11 are formed of a thin metal plate, and a
tongue-like conductive portion 12a connected to a lead wire is provided on the outer periphery
Electrostrictive element mechanically joined in series and electrically in parallel via the terminal
strip 12 with the terminal strip 12 side as the positive polarity side by an adhesive, 2 is one
metal block which becomes the front plate Preferably, the electrostrictive element 1 has a width
substantially equal to the outer diameter of the electrostrictive element, and the electrostrictive
element 1 and the other metal serving as a backing plate in a direction perpendicular to the
horizontal axis at the central portion in the horizontal direction. The upper end face of the
laminate with block 3 is a pair of front plates having a height that is an integral multiple of λ / 2
A recessed seating surface 22 of a depth which is positioned in the same plane as the facing part
21.21 of the end with the laminated body, and a groove 28 which is also deeper than the
recessed seating surface 22 in the direction perpendicular to the horizontal axis. 28 to provide
insulation between the electrostrictive element 1 and the facing portions 21. 21 on both sides of
the front plate, and in the direction of the transverse axis of ultrasonic vibration to be irradiated
forward from the electrostrictive element 1 Block the propagation of
(2) In FIG. 2, 1 denotes an electrostrictive element comprising a pair of electrostrictive elements
11.degree. 11 and a terminal plate 12 on the outer periphery of which a terminal portion 12a for
connecting a lead wire is projected. A back plate which is laminated and joined to the
electrostrictive element 1 in a recessed bearing surface 22 in a direction perpendicular to the
horizontal axis which is bored at a central portion in the horizontal axis direction of Grooves 28
and 28 which are deeper than the above-mentioned recessed bearing surface 22 holding
insulation with the electrostrictive element 1 between the both side ends 21 and 21 are
engraved, and these configurations are completely the same as the previous example. In the
example, the front plate 2 is elongated in the horizontal axis direction, and the opposing portions
21.21 formed at both ends via the laminated body of the electrostrictive element 1 and the
backing plate 3 and the deep grooves 28.28 are attached. At a portion corresponding to a node
of the laterally propagating vibration in the opposite portion 21.21, the direction perpendicular
to the horizontal axis The through holes 21 a + 21 a are provided to prevent the vibration that
propagates in the lateral direction and makes the irradiated surface of the front plate undulate in
the case where the major axis dimension of the front plate 2 is increased. (3) FIG. 8 is a plurality
of, in this case, an integral multiple of λ / 2 as in the previous case, in order to increase the
output, the concave bearing surfaces 22. Terminal plates 12 '12' and 12 'each having a pair of
electrostrictive elements 11, 11.11, 11' and 11.11 and conductive portions 12a + i 2'a and 12 "a
on 22 'and 22 #. 8 pairs of electrostrictive elements 1, 1 ′ and 1 ′ ′ and backing plates 8, 8
′ and 8 ′ ′ are respectively manufactured and laminated in the same manner as in the
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previous example. The upper end face is set equal to the height of an integral multiple of λ / 2
of the front plate, and the height of the integral multiple of λ / 2 is maintained between the
laminates of the eight electrostrictive elements and the backing plate. Similarly, a portion
corresponding to a node of the laterally propagating vibration in the facing portion 21.21 of the
front plate formed through the deep groove 28.28 is straight with the horizontal axis. The
angular through holes 21a e 21a are provided, and they are propagated in the lateral direction to
block the vibration that gives rise to the irradiation surface of the front plate. In this example, the
electrostrictive elements 8 'and 8 "and the backing plate 8.8 are laminated on the recessed seat
surfaces 22' and 22 'formed on both side ends of the front plate 2 in the horizontal axis direction,
and fixed I #. However, in order to apply a sufficient acoustic load to these electrostrictive
elements 8 and 8, the concave seat surfaces 22 'and 22 "on the both ends of the front plate 2 are
electrostrictive elements 1' and 1" on the back plate 8 '. , 8 'are not shown, but through the same
groove as the groove 28.28 of the previous 2 example which is deeper than the recessed bearing
surface, the opposite portion 21 of the front 2 example of the height of λ / 2 as well. The front
plate 2 may be extended in the longitudinal direction so as to form a corresponding portion
corresponding to any of 21.
In addition, although fixation of the electrostrictive element and backing board which consist of a
pair of electrostrictive element and terminal board to the front board on the gold side was shown
about the mode laminated by the adhesive agent, as shown in FIG. The element 1 is an annular
body composed of an annular piezoelectric element 11.11 and an annular terminal plate 12 and
is protruded downward from the backing plate 8 and the electrostrictive element 1, rubber
inserted in its central hole, plastic Alternatively, the front plate 2 may be bolted by means of a
wire ring 8a which is inserted through an insulating pipe 4 such as a screw or the like and
screwed into a screw hole 22a drilled in the recessed bearing surface 22 of the front plate 2. The
ring 22b protruding from the concave seating surface 22 and the screw hole 3b drilled in the
backing plate 8 form an annular shape, while providing an insulating means 4 such as an
insulating pipe in the central hole In addition to bolting, although not shown, it is possible to seat
on the outer end faces of the recessed bearing surface of the front plate and the backing plate
Forming another portion, inserting the recessed seat surface of the front plate, the
electrostrictive element, and the central hole of the backing plate 8 and securing another bolt
with a bolt head and a nut which are seated at the portion. In the case of using other tightening
bolts, the outer shape of the eight persons shall be the width of the front plate as a side. The
formation facilitates the processing of the recessed bearing surface of the front plate. In addition,
the height from the upper end face of the front plate and the back plate laminated together with
the electrostrictive element on the recessed seat surface of the front plate to the irradiated
surface of the front plate is also an integer of through λ / 2 described above. The dimensions in
the direction of height and thickness are not particularly limited, but it is preferable that the
center in the thickness direction of the electrostrictive element be located at a portion that is an
integral multiple of λ / 2. [Effects of the Invention] The Langevin-type vibrator of the present
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invention has the above-described configuration, and as an ultrasonic vibration device for a long
and narrow area, the acoustic load of the electrostrictive element is transmitted to the front plate
without waste, so irradiation is performed. Even when the area is expanded and the front plate is
made particularly long, there is also an oppositely extending oppositely formed in the transverse
axial direction, which is formed via the deep groove and the laminate of the electrostrictive
element and the backing plate on the recessed seat surface of the front plate. The transmission
hole in the direction perpendicular to the horizontal axis is blocked by the through-hole drilled in
the direction perpendicular to the horizontal axis, and it is a through-hole which is not cut out to
the upper or lower end face and is connected in a bridge shape Since ultrasonic waves can be
irradiated uniformly from the irradiated surface without causing bending to this part and
electrostrictive elements can be arranged in parallel according to the required output, various
types of ultrasonic vibration are used. Targets equipment, especially rectangular scissors
Cleaning tank, or a long linear surface of plastics using ultrasonic Kueruda to weld exhibits the
console effect.
[0002]
Brief description of the drawings
[0003]
FIG. 1 shows a basic aspect of the Langevin type vibrator according to the present invention, FIG.
1A is a top view, FIG. 2B is a longitudinal sectional view taken along the line A in FIG. Fig. 8
shows another embodiment extended in the horizontal axis direction, wherein Fig. A is a top
view, Fig. B is a longitudinal sectional view taken along the line of A of Fig. 8 and Fig. 8 is a Lange
of the present invention according to the present invention. Pan type vibrator is shown, A figure
is a top view, B figure is a vertical cross-sectional view in the Haar line of A figure, and A 4 and B
are electrostrictive elements and backing on the concave seat surface of the front plate
respectively. It is a longitudinal cross-sectional view which shows the other method of laminating
¦ stacking and fixing a board.
DESCRIPTION OF SYMBOLS 1 ... Electrostrictive element, 2 ... Front plate, 21.21 ... Opposite part,
21a + 21a ... Through-hole, 22.22 ... Recession bearing surface, 8, 8 ... Backing board patent
Assignee: Nippon Specialty Ceramics Co., Ltd. n Upper line □ Agent Ikumi Takashi 1t, 2 ° Fig. 1
Fig. A Fig. 1 B # 14 FIJA 11 22 a 1 22 Fig. 4 B / l \ \ \
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