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JP2004228862

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DESCRIPTION JP2004228862
An object of the present invention is to reduce the number of parts, to facilitate assembly, to be
compact, have high work efficiency, and have the same characteristics (vibration with no load) at
the same frequency (λ / 2) as a conventional bolted Langevin type ultrasonic transducer. The
present invention provides an inexpensive ultrasonic transducer that can obtain the velocity.
SOLUTION: A piezoelectric element 4 having a function of adjusting a frequency and performing
a load balance is bonded and integrated to the bottom of a horn 3 or 3A. The horn 3 is formed in
a substantially conical shape, and has a structure in which the middle mass 2 is integrally formed
at the lower part thereof, thereby reducing the number of parts and achieving downsizing,
improvement of productivity and the like. [Selected figure] Figure 1
Ultrasonic transducer
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
ultrasonic transducer used for atomization of a liquid or the like. [0002] A conventional
ultrasonic transducer capable of atomizing a liquid at a frequency of 1 MHz or less is a boltclamped Langevin-type ultrasonic transducer BLT at that frequency (a piezoelectric ceramic is
metal-locked by a bolt. It is necessary to have a shape that is approximately the same size as an
ultrasonic transducer having a structure sandwiched between For example, Japanese Patent
Application No. 2001-307077 previously filed by the applicant of the present invention exists as
this bolt-clamped Langevin type vibrator. FIG. 5 is a front view thereof, FIG. 6 is a side view, and
FIG. 7 is a central longitudinal sectional view of the same. The bolt-clamped Langevin type
vibrator 30 includes a metal horn 31 which generates an ultrasonic wave by vibration, and a
piezoelectric element 33 one end of which is coupled to the bottom portion 32 of the horn 31 to
vibrate the horn 31. It consists of a metal member coupled to the other end side of this
piezoelectric element 33, and is provided with a back mass 34 for frequency adjustment and load
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balance adjustment, and these members are bolts inserted in the central axial direction of the
inside thereof It is integrated via the insulating member 36 by 35. Since the bolt-clamped
Langevin type ultrasonic transducer 30 has a structure in which the horn 31 and the
piezoelectric element 33 are tightened by the bolt 35, stress is applied to the piezoelectric
element 33, and the back mass 34 is placed behind the piezoelectric element 33. It is set as the
composition provided. In the figure, reference numerals 37 and 38 denote electrodes for
applying an alternating voltage to the piezoelectric element 33, and reference numeral 38a
denotes a terminal portion. As described above, the conventional bolted Langevin type ultrasonic
transducer 30 is provided with parts such as the horn 31, the piezoelectric element 33, the back
mass 34, the bolt 35 and the like. There is a problem that the number of parts is large, the
assembly is complicated, and the cost is increased. The present invention has been proposed in
view of the above, and the object of the present invention is to reduce the number of parts, to
facilitate assembly, to be compact, to have high work efficiency, and to achieve the conventional
bolted Langevin type super An object of the present invention is to provide an inexpensive
ultrasonic transducer which can obtain the same characteristic (vibration velocity at no load) at
the same frequency (λ / 2) as the acoustic transducer. SUMMARY OF THE INVENTION The
present invention achieves the above object by bonding the piezoelectric element 4 to the bottom
of the horns 3 and 3A.
Further, in this case, the horn 3 is formed in a substantially conical shape, and the middle mass 2
is integrally formed at the lower part thereof. The horn 3A is formed of a horn 3a having a
substantially rectangular longitudinal cross section, a horn 3b having a substantially triangular
shape, a flange 3 ', and a cylindrical middle mass 2, and is extruded into a predetermined shape
in advance. It is characterized in that it is formed by cutting the formed aluminum rod into a
predetermined length. DETAILED DESCRIPTION OF THE INVENTION Embodiments of the present
invention will be described below with reference to the drawings. 1 (a) to 1 (c) show an
embodiment of the present invention, and FIG. 1 (a) is a plan view of an ultrasonic transducer
according to an embodiment of the present invention, (b The drawing is a schematic front view,
and (c) the drawing is a bottom view. The ultrasonic transducer 1 of the present invention is
characterized by comprising a horn 3 having a middle mass 2 at the lower part, and a
piezoelectric element 4 provided at the lower part of the middle mass 2 of the horn 3 and the
like. . That is, the middle mass 2 and the horn 3 are formed by cutting a metal such as aluminum
and are made of one member. The horn 3 has a substantially conical shape, and a flange 3 ′ for
positioning and mounting is formed at the lower part, and the middle mass 2 is formed in a
substantially short cylindrical shape. A piezoelectric element 4 such as a piezoelectric ceramic is
bonded to the lower part of the middle mass 2 with an adhesive and integrated without using a
bolt. Since the piezoelectric element 4 is not stressed because it is not tightened using a bolt, it is
not necessary to provide the back mass 2 behind the piezoelectric element 4 as in the
conventional example shown in FIGS. In this embodiment of the present invention, a middle mass
2 for adjusting the frequency and performing load balance is integrally provided behind the horn
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3 to combine two parts into one. In addition, since the adhesive is used for bonding without using
a bolt in assembling, it can be easily assembled and suitable for mass production. For example, an
epoxy resin, an acrylic resin, a silicone resin or the like is used as the adhesive. The ultrasonic
transducer of the present invention is compact, and is used for atomizing a liquid at a frequency
of 1 MHz or less, and there is no problem in strength even in the bonded structure. An electrode
for applying piezoelectricity is provided on the piezoelectric element 4 in a well-known manner.
Since this electrode structure is not directly related to the main part of the present invention,
illustration is omitted for convenience of explanation.
2 (a) and 2 (b) to 4 show a second embodiment of the present invention, FIG. 2 (a) is a plan view,
FIG. 2 (b) is a front view, and FIG. FIG. 4 is an explanatory view of the manufacture of the horn.
This embodiment is characterized in that the shape of the horn 3A is formed in a simple shape
including a horn 3a having a substantially rectangular longitudinal section and a horn 3b having
a substantially triangular shape. That is, in the first embodiment shown in FIGS. 1 (a) to 1 (c), the
horn 3 is formed in a substantially conical shape, and the horn 3 is an elongated aluminum rod
having a circular cross-sectional shape. The aluminum block is rotated while being fixed with a
jig, and the side surface is cut to form a conical shape. In the first embodiment, in order to make
the horn 3, first, the aluminum rod is cut into a predetermined length, and then the cut aluminum
block is formed into the substantially conical horn 3, the middle mass 2 portion, etc. It has to be
machined and the production is complicated. In the second embodiment, complicated cutting of
the portion of the horn 3A is unnecessary, and it is easy to manufacture. That is, as shown in FIG.
4, a rod-like metal member 5 such as aluminum consisting of a horn 3a having a substantially
rectangular elongated vertical cross-section and a horn 3b having a substantially triangular
shape is previously made by extrusion molding. prepare. The rod-like body 5 is fixed with a jig
(not shown) and cut into a predetermined length so that a large number of horns 3A can be
easily manufactured. The flange 3 ′ and the middle mass 2 can be easily manufactured by
cutting a cylindrical aluminum rod into a predetermined length. The horn 3A can be
manufactured by bonding and bonding the manufactured horns 3a, 3b, the flange 3 ', the middle
mass 2 and the like. Further, by bonding and bonding the piezoelectric element 2 to the bottom
side of the middle mass 2, the ultrasonic transducer can be assembled. In this second
embodiment, although the number of parts of the horn 3A is increased as compared with the first
embodiment, since the shape of each component is simple, the manufacture is extremely easy
and the productivity is good. Also in this embodiment, it is possible to simultaneously
manufacture the horn 3A having a substantially rectangular shape and a substantially triangular
shape, the middle mass 2 and the like simultaneously by cutting or the like. Of course.
Further, although the case of using for atomizing a liquid has been described in the above
embodiment, it is of course possible to use other than that. As described above, according to the
present invention, the horn, the piezoelectric element, the back mass, etc. are not integrated by
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bolting as in the prior art. The simple junction structure enables transmission of vibration, and
the horn 3 and the piezoelectric element 4 are integrated. Therefore, manufacture is easy, mass
productivity is excellent, and cost can be reduced. Further, since the horn 3 has the middle mass
2 and the number of parts is reduced to one in comparison with the conventional example, the
number of parts is reduced to one. Cost reduction can be achieved, and further miniaturization
can be achieved. Further, since the bolt is not bolted, no stress is applied to the piezoelectric
element, and the piezoelectric element 2 is bonded to the bottom of the horn 3 and the parts are
uniformly joined with a wide area, so that the vibration transmission is improved. It is possible to
obtain characteristics (no-load vibration velocity) equivalent to that of a bolt-clamped Langevin
type ultrasonic transducer of frequency (λ / 2) even if the size is good. By the way, the
conventional bolt-clamped Langevin-type ultrasonic transducer that enabled atomization of liquid
at a frequency of 1 MHz or less required a power of about 20 W / cm <2>, but amplified the
vibration amplitude. In the present invention in which the horn and the piezoelectric element are
joined and miniaturized, an equivalent amount of liquid atomization can be obtained at about 2
W / cm <2>, and so-called work efficiency is also good. According to the third aspect of the
present invention, although the number of parts is increased as compared with the first
embodiment, since the shape of each part is simple, manufacture is easy, suitable for mass
production, and cost reduction is achieved. Can. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1
(a) is a plan view of a first embodiment of the present invention, FIG. 1 (b) is a schematic front
view, and FIG. 1 (c) is a bottom view. FIG. 2 (a) is a plan view of a second embodiment of the
present invention, and FIG. 2 (b) is a schematic front view. FIG. 3 shows a schematic side view of
a second embodiment of the invention. FIG. 4 is an explanatory view showing a manufacturing
state of the horn portion in the second embodiment of the present invention. FIG. 5 shows a front
view of a conventional bolted Langevin type ultrasonic transducer. FIG. 6 shows a side view of
the same. FIG. 7 shows a longitudinal sectional view of the same. [Description of the code] 1
ultrasonic transducer 2 middle mass 3, 3A horn 3a, 3b horn portion 3 'flange 4 piezoelectric
element 5 rod-shaped body
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