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JPS6316076

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DESCRIPTION JPS6316076
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electrode mounting apparatus for an ultrasonic piezoelectric vibrator, and more particularly, to
an electrode body of an ultrasonic piezoelectric vibrator used in a liquid atomizer such as an
ultrasonic humidifier or an oil vaporizer. The improvement of the structure of (Conventional art)
Conventionally, as an electrode attachment device of this type of ultrasonic piezoelectric vibrator,
there is, for example, Japanese Utility Model Laid-Open Publication No. 51-142608. Hereinafter,
this prior art will be described. FIG. 3 is a cross-sectional view of the liquid atomizing device
(indoor humidifier), and the vibrator attachment device 1 and an excitation circuit (not shown)
are attached to the bottom of the container 3 containing the liquid 2 The water column 4 is
generated by the ultrasonic waves generated from the mounting device 1, and the fine particles 5
of the liquid 2 are generated therefrom. The fine particles 5 are discharged from the discharge
lower into the room through the duct 6 in accordance with the wind sent from the fan 8. FIG. 4 is
a cross-sectional view of a vibrator mounting device showing a first prior art example. In the
figure, 11 is provided with an ultrasonic radiation electrode surface 11a on the front surface, and
an edge electrode surface 11b formed by extracting a part of the electrode surface 11a to the T
@ edge on the back surface, facing the electrode surface tia A disk-shaped ceramic dielectric
ultrasonic piezoelectric vibrator (hereinafter referred to as a piezoelectric vibrator) having a
counter electrode surface lie substantially at the center, and this piezoelectric vibrator has
elasticity and has an inner circumferential surface The lead wire 19 connected to the excitation
output source is fixedly connected to the edge electrode surface 11b and the counter electrode
surface 11C by the solder 18, respectively. The annular holding body 12 is fixed to the stepped
portion 10 'of the periphery of the bottomed circular recessed groove 10 of the support 14 by
bonding or the like, and the surface of the solder 18 and the lead & 1119 are arranged in the
circular recessed groove 10. Lead wires 19 are led out from the support 14. There. Reference
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numeral 15 denotes a pair of screws for penetrating the bottom wall 13 of the liquid container
and securing the vibrator mounting device by the nut 16. 5 to 7 are structural views of a vibrator
attachment apparatus showing a second conventional example, FIG. 5 is an exploded perspective
view thereof, FIG. 6 is a perspective view thereof, and FIG. FIG. 2 is a cross-sectional view taken
along the line of FIG. The structure of the piezoelectric vibrator 11 itself is the same as that
described above, and the annular electrode body 22 is provided in contact with the edge
electrode surface of the piezoelectric vibrator, and provided on a part of the inner periphery of
the annular electrode body 22 The lead 123 is fixed to the projecting piece 22a with solder to
form an excitation input terminal, and an annular insulator 24 is provided by using an elastic
insulator having a U-shaped groove 24a formed on the inner circumferential surface, The
annular electrode body 22 is inserted into the groove 24a, and the elastic force is used to
sandwich the piezoelectric vibrator 11 and the annular electrode body 22. Furthermore, the
elastic electrode has a length and a length sufficient to be bonded to the counter electrode 11C of
the piezoelectric vibrator. A conductive annular body 25 having substantially the same shape as
that of the annular electrode body 22 is provided with a spring-loaded electrode plate 26 having
a force and a projecting piece 25a for fixing the lead wire 27 with solder to form an excitation
input terminal. Stacked concentrically in contact with the 24 annular faces Then, the annular
holding body 24 and the conductive annular body 25 are disposed on the annular stepped
portion 28a substantially at the center of the support 28 made of an insulator, and they are
respectively fixed by an adhesive or the like. It arrange | positions so that the counter electrode
surface 11C of a piezoelectric vibrator may be located in the center part of the recess 29, and it
is comprised so that lead wA23 and 27 may be derived | led-out from the penetration hole 30.
FIG.
(Problems to be Solved by the Invention) However, the apparatus having the above configuration
has the following problems. First, in the first conventional example shown in FIG. 4, the
piezoelectric vibrator leads to the edge electrode surface 11b and the counter electrode surface
11C! Since 19 is directly attached by soldering, the amount of solder used is individually varied
and fixed in a large number of production steps, so that it becomes a load on the piezoelectric
vibrator and the individual piezoelectric vibrators Impedance is not fixed, and a fixed amount of
atomization can not be obtained, or the solder part of the lead 119 peels off due to long-term
drive of the piezoelectric vibrator, the power is cut off, or the power is shorted. there were. Next,
in the second conventional example shown in FIG. 5 to FIG. 7, the counter electrode surface 11C
is also thick (displacement is caused by the large vibration of the piezoelectric vibrator). The
plate 26 has a counter electrode surface 11. And there is a problem that time to become noncontact state occurs. That is, as shown in FIG. 8, the piezoelectric vibrator 11 is thicker than the
state of FIG. 8 (a) at a frequency of I MHz (when it vibrates, as shown in FIG. 8 (b)) 26 occurs at a
time when the displacement of the piezoelectric vibrator 11 can not be followed. Furthermore,
since the spring-loaded electrode plate 26 is supported in a cantilevered manner, there is a
problem that the long-term vibration of the piezoelectric vibrator causes a stagnation, resulting
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in the aged deterioration of the contact state. In addition, in this manufacturing apparatus, it is
necessary to combine the parts in a double or triple manner, and the lead wire is troublesome
because the set through the insertion hole of the support, etc. It took time and cost was high. The
present invention eliminates the above-mentioned problems and focuses on the fact that the
piezoelectric vibrator transmits energy rather than transmitting information, and devises the
shape of the electrode body of the piezoelectric vibrator to ensure contact. It is an object of the
present invention to provide an electrode mounting device for an ultrasonic piezoelectric vibrator
that can reduce the manufacturing cost. (Means for Solving the Problems) In the present
invention, in order to solve the above problems, an ultrasonic radiation electrode surface is
provided on the surface of a disk-shaped ceramic piezoelectric body, and a part of the radiation
electrode surface is provided on the surface. Ultrasonic piezoelectric vibrator provided with an
edge electrode surface derived and formed in the peripheral portion and a counter electrode
surface opposed to the radiation electrode surface substantially at the center portion, and elastic
retention arranged above the piezoelectric vibrator Body, an annular electrode body disposed
under the piezoelectric vibrator and joined to the edge electrode surface, a ring separator
disposed under the annular electrode body, and disposed under the ring separator A conductive
electrode body provided with a cylindrical portion having a planar contact surface in contact with
the counter electrode surface is concentrically laminated and fixed, and the conductive electrode
body and the annular electrode body are respectively subjected to the piezoelectric vibration In
the vibration input terminal of the That.
(Operation) According to the present invention, as configured as described above, the counter
electrode surface of the piezoelectric vibrator is constantly biased downward by the elastic
holder, and the counter electrode of the piezoelectric vibrator is constantly in the planar contact
surface Can be brought into contact with the conductive electrode body. Therefore, reliable
power feeding can be performed, and the manufacturing cost can be reduced. Embodiments of
the present invention will be described in detail with reference to the drawings. FIG. 1 is an
exploded perspective view of an ultrasonic piezoelectric vibrator mounting device according to
the present invention, and FIG. 2 is a side view of the ultrasonic piezoelectric vibrator mounting
device. In the figure, reference numeral 31 denotes a flat plate-like upper plate, and screw holes
31b are provided in the center so as to face both sides of a circular hole 31a1. An elastic holder
32, for example, a bush (elastic holder) made of rubber, has a through hole 32a at its center and
a groove 32b at its outer periphery. The upper plate 31 and the bushing 32 are assembled as
shown in FIG. That is, as shown in FIG. 9 (a), the bushing 32 is inserted into the upper plate 31,
and the groove 32b of the bushing 32 is resiliently fitted around the circular hole 31a of the
upper plate 31. . The state thus combined is shown in FIG. 9 (b). Next, 33 is a piezoelectric
vibrator, and each electrode surface is formed on a disc-shaped ceramic piezoelectric body. The
detailed structure is shown in FIG. That is, FIG. 1O (a) is the upper surface of the piezoelectric
vibrator (based on FIGS. 1 and 2), FIG. 10 (b) is a bottom view of the piezoelectric vibrator, and
FIG. 10 (c) is piezoelectric vibration It is a sectional view of a child. In these figures, 33a is an
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ultrasonic radiation electrode surface to be the upper surface of the piezoelectric vibrator, 33b is
an edge electrode surface drawn from the radiation electrode surface to the rear surface, and
33C is located at a substantially central portion of the rear surface. It is a counter electrode
surface facing the radiation electrode surface 33a. An annular electrode body 34 is brought into
contact with the edge electrode surface 33b of the piezoelectric vibrator, has a lead wire attached
thereto, and is provided with a lead piece 34a serving as an excitation input terminal. An elastic
member 35 is a ring-shaped separator made of an insulator, for example, rubber, and has a
through hole 35a. Reference numeral 36 denotes a conductive electrode body having a
cylindrical portion 36b having a planar contact surface 36a on the upper end face, to which a
lead wire is attached, and a lead piece 36C serving as an excitation input terminal is provided.
The planar contact portion 36a of the cylindrical portion 36b penetrates the annular electrode
body 34 and the through hole 35a of the ring-shaped separator to contact the counter electrode
surface 33C of the piezoelectric vibrator (see FIG. 2), and further detailed The configuration is
shown in FIG.
That is, FIG. 11 (a)-is a top view of the conductive electrode body, and FIG. 11 (b) is a crosssectional view thereof. As shown in FIGS. 12 (a) to 12 (e), the electrode mounting device for an
ultrasonic piezoelectric vibrator configured in this manner is resilient to the piezoelectric vibrator
11 from the upper side to the lower side as shown in FIG. 12 (a) to FIG. 12 (e). The pressing force
is applied by the bush 32 having a gap, and in any operation state, any point of the counter
electrode surface 11c of the piezoelectric vibrator 11 and the planar contact surface 36a of the
conductive electrode body 36 are separated. It is possible to contact without fail. The lower plate
37 is provided with screw holes 37 a corresponding to the screw holes 31 b of the upper plate
31. The reference numeral 38 denotes a screw, and as shown in FIG. 2, the lower plate 37, the
conductive electrode body 36, the ring-shaped separator 35, the annular electrode body 34, the
piezoelectric vibrator 33, and the upper 31 and The assembly is stacked, and the upper plate 31
and the lower plate 37 are tightened by screws 38 to assemble the piezoelectric vibrator
mounting apparatus as shown in FIG. The present invention is not limited to the above-described
embodiments, and various modifications can be made based on the spirit of the present
invention, and these are not excluded from the scope of the present invention. (Effects of the
Invention) As described above in detail, according to the present invention, the following effects
can be achieved. (1) As apparent from FIG. 11 described above, the contact of the electrode body
to the electrode surface of the piezoelectric vibrator can be made reliable. (2) The components
can be sequentially stacked and assembled at one time, and moreover, the processing of lead
wires and the like is easy, and the manufacturing cost can be significantly reduced. Furthermore,
there are a wide range of application fields, including ultrasonic humidifiers and oil gasifiers for
cars.
[0002]
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Brief description of the drawings
[0003]
1 is an exploded perspective view of the mounting device of the ultrasonic piezoelectric vibrator
according to the present invention, FIG. 2 is a side view of the mounting device of the ultrasonic
piezoelectric vibrator, and FIG. 3 is a conventional liquid atomizing device (indoor humidification
4 is a sectional view of the piezoelectric vibrator mounting apparatus showing the first prior art
example, and FIG. 5 is an exploded perspective view of the piezoelectric vibrator mounting
apparatus showing the second prior art example, FIG. 7 is a perspective view of a piezoelectric
vibrator mounting apparatus showing a second prior art example, FIG. 7 is a cross-sectional view
taken along the line of FIG. 6, and FIG. 8 is an explanatory view of the operating state of the
conventional piezoelectric vibrator mounting apparatus; Fig. 9 is an assembly explanatory view of
the upper plate and the bush, Fig. 10 is a structural view of the piezoelectric vibrator, Fig. 11 is a
structural view of the conductive electrode body of the present invention, and Fig. 12 is the
piezoelectric vibrator of the present invention It is explanatory drawing of the operation state of
a mounting apparatus.
31 · · · upper plate, 31b, 37a · · · · · · · · · · · · · (27 2 3 4 5 6 5 6 5 6 5 6 5 6 5 6 7 8 9 8 Edge
electrode surface, 33C: opposite electrode surface, 34: annular electrode body, 35: ring shaped
separator, 36: conductive electrode body, 36 m: planar contact surface, 36b: Cylindrical part, 37
... lower plate, 38 ... screw.
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