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JPS5160496

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DESCRIPTION JPS5160496
The title of the invention
Fastening method of langeban type vibrator
3. Detailed Description of the Invention The present invention relates to a method of fastening a
Langevin type vibrator. In the run / span type vibrator in which a pair of metal blocks are
disposed on both sides of the electrostrictive vibration element, the connection between the
electrostrictive vibration element and the metal block is conventionally a bolt passing through
the inside of the electrostrictive vibration element. Etc. done by screw members. As shown in FIG.
1, this screw-clamped vibrator has an annular shape in which a pair of piezoelectric elements 1.2
made of lead zirconate titanate ceramic or the like are electrically stacked in parallel via the
terminal plate 3. An electrostrictive vibration element P1 and a first metal block welded to the
end face of one piezoelectric element l of the electrostrictive vibration element and having a blind
screw 4 + a at the center, and an end face of the other piezoelectric element of the
electrostrictive element The first metal block j having a through hole ta of different diameter in
the center and the large metal hole ta ′ head 6a of the second metal block is seated and the
screw portion 6b is made small diameter hole zX of the block. And the central screw holes of the
electrostrictive vibration element respectively, and the blind screw holes 4 of the first metal
block! (a) screwed to the electrostrictive vibration element Pl, first. The second seven metal brock
,! (1), which has a rigid structure, high mechanical strength, and a large amplitude EndPage: 1
drive, so it is easy to plasticize and cut. Although widely used as a source of ultrasound energy in
fields and the like, there are still many problems to be solved. That is, in this type of vibrator,
after the electrostrictive vibration element P1 and the second metal block j are sequentially
stacked on the first metal block at the bifurcated end, these are compressed and fixed by the
rotation of the tightening bolt t. ?, Each component of the electrostrictive vibration element Pl
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which rotates the second metal block j in the same direction by the contact frictional resistance
with the head 6a of the tightening bolt 6 and / or 2. Not only do they cause eccentricity, but
scars and peeling occur on electrodes (not shown) formed on the front grip surface of the
piezoelectric element 2/2 and also on the surface of the piezoelectric element in addition to
compressive stress and torsional stress As a result, various stress distributions can not be
obtained, and furthermore, a gap and a screwing portion formed between the inner bottom of the
blind 6p hole paO of the first metal block and the end of the bolt 6 screwing portion screwed
thereto. The first metal block is formed by a minute gap which is inevitably formed between the
screw slopes. A part of the sound wave propagating in the ginseng is reflected 1 and refracted to
significantly inhibit the wave, but the acoustic conversion efficiency and the frequency
characteristic are lowered and their improvement is desired. The present invention has
succeeded in obtaining a Langevin-type vibrator which exhibits a remarkable improvement effect
in performance and mass production by adopting a unique coupling method regardless of the
above-mentioned defects. Hereinafter, an embodiment of the drawings will be described.
In FIG. 2, P2 is made of lead zirconate titanate-based porcelain, and a pair of annular
piezoelectric elements formed by forming silver electrodes (not shown) on both sides and
polarized in the thickness direction are electrically parallel in an annular configuration. The
electrostrictive vibration element formed by laminating | stacking via terminal board / 3 is
shown. / 1 abuts on one of the piezoelectric element l / the outer end face of the electrostrictive
vibration element, and the central hole of the electrostrictive i moving element P2 and the central
hole of the second metal block to be described later Of the first metal block made of A4 alloy or
the like, which is provided by projecting out the connecting shaft / ≠ a, / j is held on the outer
end face of the other piezoelectric element lλ− of the electrostrictive vibration element
similarly to the central hole irh At the second metal block, which is higher than the equipped A /
gold alloy. In this FIG. In a state in which the electrostrictive vibration element P2 is held
between the second metal block l ≠ and is with a pressure, plastic deformation of the outer end
portion of the connecting shaft / 'iZ, a protruding from the first metal block is performed. The
electrostrictive vibration element P2 and the first one are fixed by locking in the central hole isa
of the two metal block. A second metal block itt, is integrally fastened, and a specific example is
shown in FIG. -That is, as shown in FIG. 3A, an outer end face of the connecting shaft / ≠ a of the
first metal block is formed with a notch / ≠ b with a cross section of 7 and a circumferential
groove 14IC is formed on the side, An annular protrusion tzb is also formed on the inner surface
of the hole / jF 3.0 at a portion corresponding to the circumferential groove ipc of the connecting
shaft / la, After laminating the second metal block l ≠, is and the electrostrictive vibration
element P2, place it on the table of the pressing device and press the pressing member H against
the outer end face of the second metal block is from above to make a predetermined
compression With load applied, as shown in FIG. B, while sliding the punch h in the pressure
member H to press-fit the notch / 44b of the connecting shaft 1a, its outer end portion is
plasticized outward The electrostrictive vibration element P2 is firmly sandwiched between the
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first and second metal blocks l ≠ and is by deforming and injecting the side groove iac into the
projections / jb of the second metal block. It is-. Similarly, the embodiment described above
shows an embodiment in which the connecting shaft projecting from the first metal block is
plastically deformed and engaged with the second metal block, as shown in FIG. The outer end of
the connecting shaft l ≠ a 'of the one metal block / l' is a convex lμb ', and the corresponding
second metal block l! The outer surface portion lj, b 'of the central hole lja' of the frame may be
plastically deformed to be engaged with the convex step surface l'b 'of the connection shaft tpe :.
In the present invention, When laminating and fastening the second metal block and the
electrostrictive vibration element, the contact side end face of the first 1 'and second metal block
is previously subjected to a baking treatment with a high frequency current or the like to obtain a
metal. There is an advantage that the adhesion between the block and the contact surface of the
electrostrictive element can be enhanced.
“EndPage: 2” Furthermore, the present invention has hitherto used a combination of two
piezoelectric elements and one terminal board as an electrostrictive vibration element, but the
number of piezoelectric elements and terminal boards is limited to this. It will not be done.
According to the above fastening method of the lotus type present invention Langevin type
vibrator, the connecting shaft which is provided at the center of the end face of the first metal
block is inserted through the connecting shaft and the annular electrostrictive vibration element
and the second metal block are sequentially arranged. After lamination, the connection shaft of
the first metal block is engaged with the second metal block by plastic deformation in a state in
which the laminate is compressed and held, whereby the electrostrictive vibration element,.
Unable to avoid using the conventional screw rotation fastening method. Various disadvantages,
ie, damage to the electrode surface of the piezoelectric element, -8 eccentricity of components,
wave due to air gap of the screw fitting portion; -Eliminates 1) interference, non-uniformity of
stress distribution, etc. and significantly improves the performance. In addition, the present
invention also relates to assembly of 1st metal block, electrostrictive vibration element -1 or
above with compression of the stack of second metal block? Enhanced very easily because
performed [production of only by the corresponding connecting shaft or thereto the first metal
block, resulting in equal numerous effects to lower the production cost by a large margin.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front cross-sectional view of a conventional
screw and a Langevin-type vibrator according to a fastening method, and FIG. 2 is a front crosssectional view of a Lansch / Slider cover vibrator according to a fastening method of the present
invention; FIG. 3 shows a press forming process of the locking portion of the vibrator shown in
FIG. 2, wherein A shows a state before operation and B shows a pressure state. FIG. Φ is a front
cross-sectional view of a Langevin-type vibrator showing another embodiment of the present
invention. P2: annular electrostrictive vibration element, lj: first metal block, / 4 (a: connecting
shaft, lj: fourth cometal block Fig. 4 EndPage: 36, inventions other than the above And Patent
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Assignee /) Inventor-2) Patent Assignee Thai Trough Tribo! 1st No. 13 to 2 Toriege Taito-ku,
Tokyo EndPage: 4
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