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JPS6192100

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DESCRIPTION JPS6192100
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a piezoelectric vibrator used in an electrical self-expense converter
such as a piezoelectric buzzer. In the case of the construction of the prior art and its problem
electric cost converter such as a piezoelectric buzzer, the important factor is the resonant
frequency of the piezoelectric vibrator. The resonant frequency of the piezoelectric vibrator is
determined by the Young's modulus, thickness, size, Poisson's ratio, adhesive strength, thickness
of the adhesive layer, and the like of each of the ceramic piezoelectric body and the metal plate.
Also, a large color tube is received by the method of supporting and fixing the vibrator.
Conventionally, a piezoelectric vibrator used for an acousto-optical material such as a
piezoelectric body is made by bonding a disk-shaped ceramic piezoelectric body and a diskshaped metal plate similarly using an adhesive, and stretching the ceramic piezoelectric body in
the radial direction The sound is generated by changing the vibration of the piezoelectric vibrator
into flexural vibration. The ceramic piezoelectric body and the metal plate are flat plates, and the
bonding jig is also flat. At normal temperature, a kneading pressure is applied between the
bonding jig so as to thin the bonding layer to solidify the bonding agent. The resonance
frequency of the piezoelectric vibrator can be changed depending on the material, diameter and
thickness of the ceramic piezoelectric body and metal plate if the supporting and fixing
conditions of the piezoelectric vibrator are the same. However, in the case of the ceramic
piezoelectric body, changing the material It is not easy to affect the piezoelectricity itself. It is not
easy because the diameter and thickness also need to be changed in the process before sintering.
In addition, if the diameter and thickness are changed, the desired sound pressure can not be
obtained. The same is true for metal plates. The metal plate used for the piezoelectric vibrator is
usually a thin plate of 0.3 mn + or less, but it is not easy to make a plate having a composition
and thickness outside the JIS standard. Therefore, in the conventional method in which the
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ceramic piezoelectric body and the metal plate are bonded at normal temperature, the resonance
frequency of the completed piezoelectric vibrator is determined by the selection of the material,
the diameter and the thickness, and has a jump value You can only get In order to obtain
piezoelectric vibrators slightly different in resonance frequency, it has been necessary to select
different combinations of materials, diameters and thicknesses. OBJECTS OF THE INVENTION
The present invention is intended to overcome the drawbacks of the prior art, and it is an object
of the present invention to easily produce a piezoelectric vibrator having an arbitrary resonant
frequency. SUMMARY OF THE INVENTION In order to achieve the above object, a method of
manufacturing a piezoelectric vibrator of the present invention is to bond and fix a ceramic
piezoelectric body having a different thermal expansion coefficient and a metal plate at a
temperature different from normal temperature. Description of Embodiments Hereinafter, an
embodiment of the present invention will be described based on the drawings. In the figure, 1 is
the upper part of the bonding jig, 2 is the lower part of the bonding jig, 3 is a ceramic
piezoelectric body, 4 is an adhesive, and 5 is a metal plate.
6 is a heater built in the upper part 1 of the bonding jig, 7 is a heater built in the lower part 2 of
the bonding jig, 8 and 9 are the upper part 1 and the lower part 2 of the jig to be in contact It is a
heater that heats the atmosphere from the outside. These heaters may be built-in only or external
only. For example, PCM-33Δ (trade mark, thermal expansion coefficient soX 1 o-7 / ° C.)
manufactured by Matsushita Electric Industrial Co., Ltd. as the ceramic piezoelectric body 3, and
a brass plate (thermal expansion coefficient 180 × 10 −) as the metal plate 5. When 7 / ° C. is
used, the thickness is 0.1 mm, the diameter of the ceramic piezoelectric body 3 is 21 mm, the
diameter of the metal plate 5 is 30 mm, and the upper part 1 and the lower part 2 of the bonding
jig The temperature at the time of bonding, which is clamped by the pressure, was 60.degree. A
two-component epoxy resin adhesive was used as the adhesive 4. As a result, when the resonance
frequency was measured in the state of center support at normal temperature, it was about
780H7. The resonant frequency in the case of bonding with the same ceramic piezoelectric body,
metal plate, adhesive, and bonding jig was about 7 oot- + z. As another example, PCM-5
(registered trademark, with a thermal expansion coefficient of 50 × 10 -7 / 'C) manufactured by
Matsushita Electric Industrial Co., Ltd. as the ceramic piezoelectric body 3, a flat plated steel plate
(with a thermal expansion coefficient as a metal plate 5) In the case of using 120 × 10−7 / ′
C), the thickness is 0.2 mm and the diameter of the ceramic piezoelectric body 3 is 20), the
diameter of the metal plate 5 is 27 ffi I11, and the bonding temperature is 100 ° C. did. As
adhesive 4, a two-component epoxy resin adhesive was used. After bonding, the substrate was
cooled to normal temperature, and the resonant frequency was measured in the state of
supporting a node, and it was about 5 KH2. It was about 4.6 KHz when using the same material
and bonding at normal temperature. Although the bonding time required 1 hour at normal
temperature, curing was completed in about 5 minutes at 100 ° C. When the adhesive strength
is compared with the magnitude of fragments of ceramic piezoelectric body when the diaphragm
is bent to a cylinder with a diameter of 10111 m and compared with that of a 5 mm square in
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the case of room temperature curing, it is heated to 100 ° C. The cured product was subdivided
into pieces of about 1 w + n + corners. Effects of the Invention As described above, according to
the present invention, when bonding is performed in a combination in which the thermal
expansion coefficients of the ceramic piezoelectric body and the metal plate are different at a
temperature different from normal temperature, the resonant frequency at normal temperature
can be selected arbitrarily. In addition, the resonance frequency can be changed by appropriately
selecting the bonding temperature. Furthermore, the effect is great, for example, the bonding
time can be shortened and the bonding strength can be improved.
[0002]
Brief description of the drawings
[0003]
The drawings are sectional views showing an embodiment of the present invention.
1 ... upper part of bonding jig, 2 ... lower part of bonding jig, 3 ... ceramic piezoelectric body, 4 ...
adhesive, 5 ... metal plate, 6-9 ... ·heater
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