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JPS4898068

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DESCRIPTION JPS4898068
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a is an explanatory sectional view and an electric
circuit diagram showing the configuration of a conventional piezoelectric composite vibrator, FIG.
1b is an enlarged sectional view of an end portion of a piezoelectric element, and FIG. Fig. 2b is a
sectional view and an electric circuit diagram showing the configuration of another embodiment
of the present invention; Fig. 2b is a diaphragm, Fig. 2B is a sectional view and an electric circuit
diagram showing the configuration of the embodiment of the present invention; Reference
numeral 2 denotes a conductive element, 3 a silver electrode, 4 an adhesive, 5 and 5 'a lead wire,
6 an oscillation circuit, 8 and 8' a lead wire connection portion, and 9 an insulator. (Α) (b) the
first flash? ・ 4. {Circle over (2)} (2) (b) l-166-;
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
composite vibrator for generating flexural vibration by means of an electric circuit. (1)
Conventionally, a diaphragm made of a piezoelectric element p and a metal plate is conductively
bonded to form a complex, which is flexed and vibrated by an electric circuit to generate a sound
wave to cause a call generator such as a telephone etc. Also, it generates ultrasonic waves and is
used for 1-48-98068-0.2 remote control, ultrasonic wave detectors etc. The structure is as shown
in Fig. 1, with silver electrodes 3, 3 ° on the front and back, for example The piezoelectric
element 2 of lead zirconate titanate-based ceramic and the diaphragm 1 made of a metal plate
are conductively bonded by a conductive adhesive 4 to form a composite. A lead wire 5 ° 5 'is
attached to a part of the silver electrode 3 and the diaphragm 1 and connected to the oscillation
circuit 6 to constitute an electric circuit, and bending as shown in a model of the composite 7 and
71 It vibrates to generate sound or ultrasonic waves. Thus, in order to efficiently convert the
electric energy to the sound energy, since the thickness of the complex and a thin one are used,
the diaphragm 1 and the 1) piezoelectric element 2 are also thinned and the silver electrode 3 is
inevitably formed. The diaphragm 1 approaches. For example, as dimensions generally used, the
piezoelectric element 2 has a diameter of 10 to 40, thickness #, 4--0.2 to 0.5 W, and diaphragm l
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has a diameter of 20 to 60 M, thickness The shortest distance between the diaphragm 1 and the
silver electrode is as small as 0.6 W or less at about 0, 2 to 0.5 inch. Therefore, as a disadvantage
of this piezoelectric element, since the silver electrode 3 and the diaphragm 1 are as close to
each other as described above, moisture is attached at a high temperature at a high temperature
or a dew point is connected due to a temperature change. It is also possible that the circuit "6"
may be damaged as well as the conduction between the fields 4 and 4 not to generate a sound
wave. In addition, the silver electrode 3 and lead wire hunting of the piezoelectric element may
cause deterioration of the characteristics due to sulfurization or other chemical changes in the air
or in the harmful gas at the portions 8 and 8 °. In addition, the conductive adhesive, which uses
silver, is one factor that raises the cost. The present invention is a new device that eliminates the
defects of 叙 -H, and its purpose is under severe environmental conditions, especially in high
humidity air. It is an object of the present invention to provide an inexpensive piezoelectric
composite vibrator that operates without problems in water and normal or specific harmful gas
atmosphere. The feature of the present invention is that the diaphragm is joined together with
the piezoelectric element by the non-conductive adhesive, and at least the part affected by the
environment such as the silver electrode and the lead wire connection is crimped with the
insulating material. It is to protect. Examples will be described below.
The diaphragm and the piezoelectric element 2 are integrally joined with the nonconductive
adhesive t °. This bonding surface can widely conduct current between the diaphragm 1 and the
piezoelectric element 2 by constantly bending the adhesive without any bonding agent: 3-4898068-04. Therefore, as shown in FIG. 2 (F-), the portion including the lead wire connecting
portion 8 ° of the diaphragm 1 made of at least the silver electrode 3 and the metal plate is
opposed to high humidity, water and ordinary or specific harmful debris. It is thinly coated with,
for example, enamel silicone etc., which has strong polymeric insulating material 9 (low viscosity
and desirably good adhesion to each material of the coated portion). In the above case, good
results were obtained at 5μ to 500μ. In mass production, as shown in FIG. 2 (b), it is possible to
thinly cover the entire half surface of the composite including the silver wire electrodes 3 and 4
and the lead wire connecting portion 8 'and the entire composite thinly. Furthermore, is there a
problem with the corrosion of harmful debris on the metal plate l? In addition to the above
conditions, it is necessary to select an insulating material that resists the harmful gas and coat
the necessary parts. In each of the above cases, use of an insulating material having a too high
viscosity results in coating being excessively thick, which suppresses bending vibration of the
composite and extremely increases resonance impedance, thereby making the coating thin 4-4898068-05 It is necessary. The effect of the present invention is that it can be used under these
conditions because it protects the necessary parts with insulating materials that resist high
humidity air, water and normal or specific harmful waste gases. For example, it is also possible to
use an ultrasonic transducer in water. Of course, since the adhesive may be nonconductive, the
manufacturing cost can also be reduced. Further, the effect of the present invention is effective
regardless of the shape of the metal plate 1 and the piezoelectric element 2 not only in the basic
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vibration of the flexural vibration but also in the higher vibration. The effect of the present
invention can be obtained even if the diaphragm 1 is made of only an insulating material coated
with a conductor instead of a metal plate, or 3 instead of the silver electrode 3, 3 °. p not.
4−FArijy(DmnA! tjlFf4、。 1 (a) is an explanatory sectional view and an
electric circuit diagram showing the configuration of a conventional piezoelectric composite
vibrator, FIG. 1 (b) is an enlarged sectional view of an end portion of a piezoelectric element, and
FIG. 2 (F,) is 2 (h)% 5-48-98068-06 is an explanatory cross-sectional view showing the
configuration of another embodiment of the present invention and an electric circuit diagram
showing the configuration of the embodiment of the present invention. It is a circuit diagram, 1 is
a diaphragm, 2 is a piezoelectric element. 3 indicates a silver electrode, 4 indicates an adhesive, 5
and 5 'indicate lead wires, 6 indicates an oscillation circuit, 8 and 8' indicate lead wire
connections, and 9 indicates an insulator.
Agent patent attorney n Ki Shu \. Attorney Attorney Attorney Yoshitake Shoji-648-98068-07
another 1 <(1) I, ""-"~ 7 〆 \ \ 3. 35) 7 '2 ° 6 (b) = = blind = ヨ 〒 S (3 ′ FIG. 2 ′ ′ <a) 4q 61 (8
(b) 454B-98068-08) 狸 弁 + 宝 弁. 1 、 Chairman's law management 上 上 6 、 討 6 、 Other
creators, applicants for utility model registration or agents (1) Applicants (2) utility model
applicants ^ (3) Agent's address, Yuhana Ward, Osaka Onki Island Minaminomachi 60 No. 10,
Inc., Electric Co., Ltd. (Telephone Osaka 461-1031) Name (5936) Patent Attorney Yoshitake
Masaken 48-98068-09
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