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JPS61236300

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DESCRIPTION JPS61236300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
method of manufacturing a piezoelectric speaker using deflection vibration of a lead oxide
piezoelectric ceramic. (Prior Art) FIG. 2 shows the structure of a conventional piezoelectric
sounding body. In order to manufacture this piezoelectric sounding body, first, one side of the
piezoelectric ceramic plate 1 is used as a raw material of the electrode 2 After the silver paste is
applied by screen printing and dried, the other side of the piezoelectric ceramic plate 1 is
similarly treated to form a dried silver paste layer for electrodes on both sides of the piezoelectric
ceramic plate 1 1 Next, the dried electrode silver paste is baked onto the piezoelectric ceramic
plate 1 at a high temperature of 600 to 800 ° C. to form the electrodes 2 on both sides of the
piezoelectric ceramic plate 1, and then the electrode 2 is formed. The piezoelectric ceramic plate
1 is polarized in a silicone oil at 100 ° C. for 30 minutes with an electric field of 3 kV / + mm.
Then, a metal diaphragm 4 is concentrically bonded to the piezoelectric ceramic plate 1 with an
epoxy resin adhesive 3 applied to the surface of one electrode 2 of the piezoelectric ceramic
plate 1, and the piezoelectric ceramic plate 1 is 130 When the adhesive 3 is cured by heat
treatment at a temperature of 20 ° C. for 20 minutes, the metal diaphragm 4 is bonded to the
piezoelectric ceramic plate 1 (see Japanese Patent Publication No. 56-17879). (Problems to be
solved by the invention) By the way, in the conventional method of manufacturing a piezoelectric
sounding body. Application of silver paste for electrode on one side of piezoelectric ceramic plate
1 → drying → Coating of silver paste for electrode on the other side of piezoelectric ceramic
plate 1 → drying → baking of electrode 2 on piezoelectric ceramic plate 1 → piezoelectric There
are nine steps of polarization of the porcelain plate 1 → application of the adhesive 3 on one side
of the piezoelectric ceramic plate 1 → adhesion of the metal diaphragm 4 to the piezoelectric
ceramic plate 1 → heat curing of the adhesive 3 There was a problem that the productivity of the
body was bad. Further, since the piezoelectric ceramic plate 1 is warped by the heat treatment at
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high temperature when forming the electrode 2 and the polarization of the piezoelectric ceramic
plate 1, the adhesion between the piezoelectric ceramic plate 1 and the metal diaphragm 4 is
deteriorated, and the output There is a problem that the sound pressure is low and the yield is
poor. Furthermore, since the piezoelectric ceramic plate 1 is heated to near one curie point when
the adhesive 3 is cured, there is a problem that the characteristics of the piezoelectric ceramic
plate 1 are deteriorated. The present invention was made to solve the problems as described
above, and has high productivity and yield. An object of the present invention is to provide a
piezoelectric sounding body having a large output sound pressure. (Means for Solving the
Problem) In the present invention, a metal diaphragm is attached to one side of a piezoelectric
ceramic plate having a conductive tape adhered to both sides thereof and baked to form an
electrode of the piezoelectric ceramic plate and the metal diaphragm. Polarization is performed
after simultaneously performing the bonding of
(Operation) By simultaneously forming the electrodes of the piezoelectric ceramic plate and
joining the metal diaphragm, the number of manufacturing steps of the piezoelectric speaker can
be reduced. In addition, after joining the metal plate to the piezoelectric ceramic plate, formation
of the electrode at a low temperature and polarization of the piezoelectric ceramic plate are
performed, and the adhesive curing process at high temperature is not required. Very low.
(Embodiment) FIG. 1 shows the structure of a piezoelectric speaker according to an embodiment
of the present invention, and the same reference numerals as those in FIG. 2 denote the same
parts, and this piezoelectric speaker is manufactured. First, after adhering each of the
commercially available conductive tapes to both sides of a disk-shaped piezoelectric ceramic
plate 1 having a thickness of 200 μm and a diameter of 15 mm made of lead zirconate titanate
(PzT), the thickness is 0.2 mm 0, a disk-shaped brass metal diaphragm 4 with a diameter of 22.5m is concentrically bonded to the piezoelectric ceramic plate 1 0 Next, the piezoelectric ceramic
plate 1 is heat-treated at a temperature of 200 ° C. for 30 minutes When the conductive tape is
cured, the metal diaphragm 4 is joined to the piezoelectric ceramic plate 1, and at the same time,
the electrode 5 is formed on the surface of the piezoelectric ceramic plate 1. Then, the
piezoelectric ceramic plate 1 to which the metal diaphragm 4 is bonded and the electrode 5 is
formed is polarized in an electric field of 3 kV / ma + for 30 minutes in silicon oil at 100 ° C.
When the piezoelectric sounding body manufactured in this manner is compared with the
piezoelectric sounding body manufactured by the conventional method using the piezoelectric
buzzer element, the entire manufacturing time takes about 3 hours per piece in the conventional
manufacturing method. In the manufacturing method of the present invention, the time is
shortened to about 1 hour, which simultaneously bonds the piezoelectric ceramic plate 1 and the
metal vibrating plate 4 and forms the electrode 5, and the drying step before forming the
electrode 5. Can be omitted, and affixing the conductive tape to one surface of the piezoelectric
ceramic plate 1 → pasting the conductive tape to the other surface of the piezoelectric ceramic
plate 1 → the metal diaphragm 4 to the piezoelectric ceramic plate 1 This is because five steps of
lamination → drying of the conductive tape → polarization of the piezoelectric ceramic plate 1
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are required. Also, while the production defect rate by the conventional manufacturing method is
about 22%, the manufacturing method of the present invention significantly improves to about
1%. The bonding of the metal diaphragm 4 and the formation of the electrode 5 and the
polarization of the piezoelectric ceramic plate 1 are performed in the bonded state, so that the
piezoelectric ceramic plate 1 is hardly warped, and the piezoelectric ceramic plate 1 and the
metal diaphragm 4 The bonding condition of is good. Furthermore, a buzzer using a piezoelectric
buzzer element according to the conventional manufacturing method and a piezoelectric buzzer
element according to the manufacturing method of the present invention is manufactured on an
experimental basis, and the input voltage is 20VP-P, the square wave input frequency is 2.5kHz,
and the measurement distance is the buzzer Comparing the performance under the measurement
condition of 10 cm from the front, the output sound pressure level of the piezoelectric buzzer
element by the conventional manufacturing method is 83 dB, while the piezoelectric buzzer
element by the manufacturing method of the present invention improves to 86 dB. did.
This is because the bonding state between the piezoelectric ceramic plate 1 and the metal
vibration plate 4 is improved for the reason as described above, and the deterioration of the
piezoelectric ceramic plate 1 due to the heat treatment after the polarization of the piezoelectric
ceramic plate 1 is eliminated. (Effects of the Invention) As described above, according to the
present invention, the working time is greatly shortened according to the present invention, the
productivity is significantly improved, and in the state where the metal diaphragm is adhered to
the piezoelectric ceramic plate, Since the piezoelectric ceramic plate is polarized after forming at
a very low temperature as compared with the conventional method, the warp of the piezoelectric
ceramic plate is extremely reduced, and the bonding state between the piezoelectric ceramic
plate and the metal diaphragm is improved. As a result, the deterioration of the piezoelectric
ceramic plate due to the heat treatment after polarization of the piezoelectric ceramic plate is
eliminated, the output sound pressure is improved, and a high quality piezoelectric buzzer can be
efficiently obtained.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of a piezoelectric buzzer element according to a method of
manufacturing a piezoelectric speaker according to the present invention, and FIG. 2 is a crosssectional view of a piezoelectric buzzer element according to a conventional method of
manufacturing a piezoelectric speaker.
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l · · · Piezoelectric ceramic plate, 4 · · · Metal diaphragm, 5 · · · electrodes. Patent Assignee
Matsushita Electric Industrial Co., Ltd. Figure 1 Figure 2
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