JPH11178095A - Piezoelectric sounder and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compact piezoelectric sounder without decreasing a substantial diameter of a metal-made diaphragm. SOLUTION: Plural positioning projections (diaphragm supports) 6f,... projected to an opening 6c from an inner wall of a circumferential wall 6b of a container case 5 are formed integrally. A surface 6g adhered to a piezoelectric vibrator 8 placed on an outer face of the inner wall of the positioning projections 6f is tilted, so as to be parted from the piezoelectric vibrator 8 towards the center of the piezoelectric vibrator 8. The jointing face 6g of the positioning projections 6f and the inner wall of the circumferential wall 6b are coated with adhesive to form a surface joint layer consisting of an adhesive layer. The piezoelectric vibrator 8 is placed in a front case 6 of the container case such that the piezoelectric vibrator 8 is pressed facing toward the jointed face 6g of the positioning projections 6f. The piezoelectric vibrator 8 is moved in a direction parting away from the jointed face 6g to a degree such that the adhesion between the inner wall of the circumferential wall 6b and the outer circumference of the piezoelectric vibrator 8 will not exfoliate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric sounder and a method for manufacturing the same.

[0002]

2. Description of the Related Art In recent years, downsizing of sound-producing electronic devices such as telephone receivers, mobile phones, radios, radios, and tape recorders has been advanced, and accordingly, piezoelectric sounders used as sound-producing elements of sound-producing electronic devices. There is an increasing demand for miniaturization. In general, a piezoelectric sounder is housed in a storage case made of insulating resin so that a piezoelectric vibrator separates a front air chamber and a rear air chamber. The piezoelectric vibrator has a configuration in which a piezoelectric ceramic element is joined to a plate-shaped metal vibration plate. The outer peripheral portion of the metal diaphragm is adhered to the inner wall of the peripheral wall portion of the storage case using an adhesive over the entire circumference, and the piezoelectric vibrator is fixed to the storage case, and the front and rear air chambers are fixed. The airtightness is maintained. Further, a stepped diaphragm supporting portion for supporting the piezoelectric vibrator is formed on the inner wall of the peripheral wall portion of the storage case,
The edge of the metal diaphragm is placed on the diaphragm support via the adhesive layer, and the piezoelectric vibrator is positioned at a predetermined position. Recently, in order to reduce the size of the piezoelectric sounder, it has been proposed to form a diaphragm supporting portion by a plurality of positioning protrusions arranged at predetermined intervals in a circumferential direction of a peripheral wall portion of a storage case. .

In this type of piezoelectric sounder, a piezoelectric vibrator is fixed to a storage case as follows. First, an adhesive is applied to the inner wall of the peripheral wall of the storage case and the bonding surface of the positioning projection facing the piezoelectric vibrator to form a bonding agent layer. Next, the piezoelectric vibrator is arranged in the storage case such that the piezoelectric vibrator is pressed toward the joint surface of the plurality of protrusions. When the outer peripheral portion of the metal diaphragm is joined to the inner wall of the storage case in this manner, the piezoelectric vibrator can be fixed to the storage case while maintaining the airtightness between the front air chamber and the rear air chamber.

[0004]

In this type of piezoelectric sounder, the outer peripheral portion of a metal diaphragm joined to a storage case via an adhesive does not substantially vibrate, and therefore, the portion excluding that portion is excluded. Is the substantial diameter that substantially determines the natural resonance frequency of the metal diaphragm. If the substantial diameter of the metal diaphragm can be made as large as possible, the size of the piezoelectric sounder can be reduced. In a conventional piezoelectric sounder,
Since the diaphragm supporting portion is formed by the plurality of positioning projections, the area of the portion of the metal diaphragm joined via the adhesive can be reduced. However, since the edge of the metal diaphragm is placed on the diaphragm support via the adhesive layer, even if the diaphragm support is formed by a plurality of positioning projections,
The substantial diameter that substantially determines the natural resonance frequency of the metal diaphragm cannot be increased.

Further, in the conventional piezoelectric sounder, when the piezoelectric vibrator is fixed to the storage case, the piezoelectric vibrator is arranged in the storage case such that the piezoelectric vibrator is pressed toward the joint surface of the plurality of projections. Therefore, a large amount of the adhesive between the piezoelectric vibrator and the bonding surface adheres to the outer peripheral portion of the metal vibrating plate of the piezoelectric vibrator. For this reason, there is a problem that the substantial diameter that substantially determines the natural resonance frequency of the metal diaphragm is further reduced.

SUMMARY OF THE INVENTION An object of the present invention is to provide a piezoelectric sounding device that can suppress a substantial reduction in the diameter of a metal diaphragm and can reduce the size.

Another object of the present invention is to provide a method for easily manufacturing a piezoelectric sounding device capable of suppressing the substantial diameter of a metal diaphragm from becoming smaller and capable of achieving downsizing. It is in.

[0008]

According to the present invention, there is provided a piezoelectric vibrator including a piezoelectric ceramic element, and a storage case for storing the piezoelectric vibrator, wherein an outer peripheral portion of the piezoelectric vibrator has an inner wall of a peripheral wall portion of the storage case. A plurality of positioning protrusions for positioning the piezoelectric vibrator at a predetermined position are arranged on the inner wall of the peripheral wall at predetermined intervals in the circumferential direction. Sounders are targeted for improvement. In the present invention, the bonding surfaces of the plurality of protrusions facing the piezoelectric vibrator via the adhesive layer are inclined so as to be away from the piezoelectric vibrator toward the center of the piezoelectric vibrator. When the joining surface of the plurality of protrusions is inclined as in the present invention, the natural resonance frequency of the metal diaphragm of the piezoelectric vibrator is substantially increased while maintaining the airtightness between the front air chamber and the rear air chamber. It is possible to prevent the determined substantial diameter from becoming smaller. For example, when forming an adhesive layer using a paste-type curable adhesive,
At the portion where the plurality of protrusions are located, the uncured adhesive flows along the joining surface of the plurality of protrusions in a direction gradually moving away from the metal diaphragm, and the uncured adhesive flows inward along the metal diaphragm. However, if the joint surface with the projection is inclined, the inward spread is suppressed. Therefore, while maintaining the airtightness between the front air chamber and the rear air chamber, it is possible to suppress the substantial diameter of the metal diaphragm of the piezoelectric vibrator from decreasing.
In addition, even when the adhesive layer is formed by the adhesive layer to which the adhesive is applied, while maintaining the airtightness between the front air chamber and the rear air chamber, the substantial diameter of the metal diaphragm of the piezoelectric vibrator is small. Can be suppressed. The pressure-sensitive adhesive layer does not spread radially inward on the metal diaphragm due to its fluidity, unlike a paste-type curable adhesive, but the pressure-sensitive adhesive between the metal diaphragm and the projections Is pushed inward. Even in such a case, if the joint surface of the projections is inclined at a predetermined angle, the adhesive is turned inside when the corner of the outer peripheral portion of the metal diaphragm is cut into the adhesive layer. Is not greatly pushed out. Therefore, the substantial diameter of the metal diaphragm of the piezoelectric vibrator can be suppressed from being reduced, and a necessary and sufficient adhesive layer can be formed between the metal diaphragm and the joint surface. Particularly, since the pressure-sensitive adhesive layer has flexibility, unlike the cured adhesive layer, it is difficult to hinder the vibration of the metal diaphragm. Therefore, if the adhesive layer is formed from the pressure-sensitive adhesive layer, it is possible to greatly suppress a decrease in the substantial diameter of the metal diaphragm.

The number and arrangement of the plurality of projections may be determined as appropriate. However, in order to reliably support the piezoelectric vibrator by the plurality of projections, it is preferable to arrange three or more projections arranged at substantially equal intervals in the circumferential direction of the storage case. When the number of projections increases, the structure in which the tapered surface inclined substantially over the entire inner wall of the peripheral wall portion is substantially formed, similarly to the invention proposed by the applicant in Japanese Patent Application No. 9-11034. Become equal. Although the invention proposed earlier can obtain sufficient effects,
When the configuration in which the joining surface of the plurality of protrusions is inclined as in the present invention is employed, the pressure-sensitive adhesive layer is extruded only at the protrusions, and thus the advantage that the substantial diameter is further larger than that of the previously proposed invention. is there.

A specific piezoelectric sounder of the present invention includes a piezoelectric vibrator in which a piezoelectric ceramic element is joined to a metal vibration plate, and a storage case for storing the piezoelectric vibrator. The outer peripheral portion is joined to the inner wall of the peripheral wall portion of the storage case over the entire circumference via an adhesive layer, and a diaphragm supporting portion for supporting the outer peripheral portion of the metal diaphragm is formed on the inner wall of the peripheral wall portion. Then, the diaphragm supporting portion is formed by three or more projections protruding from the inner wall and arranged at substantially equal intervals in the circumferential direction of the metal diaphragm, and is opposed to the piezoelectric vibrator via the adhesive layer. The joining surface of the projection is inclined so as to move away from the piezoelectric vibrator toward the center of the piezoelectric vibrator.

A method of manufacturing a piezoelectric sounder according to the present invention includes a piezoelectric vibrator including a piezoelectric ceramic element, and a storage case for storing the piezoelectric vibrator, wherein the outer peripheral portion of the piezoelectric vibrator is formed of a peripheral wall of the storage case. A plurality of positioning projections that are bonded to the inner wall over the entire circumference via an adhesive layer, and a plurality of positioning protrusions for positioning the piezoelectric vibrator at a predetermined position are arranged on the inner wall of the peripheral wall at predetermined intervals in the circumferential direction. The method is intended for the production of containers. Then, an adhesive is applied to the inner wall of the peripheral wall and the bonding surface of the projection facing the piezoelectric vibrator to form a bonding agent layer composed of an adhesive layer, and the piezoelectric vibrator is pressed toward the bonding surface of the plurality of protrusions. Thus, the piezoelectric vibrator is arranged in the storage case. Then, the piezoelectric vibrator is moved in a direction away from the joint surface to such an extent that the joint between the inner wall and the outer peripheral portion of the piezoelectric vibrator does not come off. When the piezoelectric vibrator is moved in this way,
When the metal vibration plate of the piezoelectric vibrator is pressed onto the adhesive layer, the pressure-sensitive adhesive layer pushed inward from between the metal vibration plate and the protrusion is pulled back toward the outside, and that much metal The substantial radius of the diaphragm can be increased.

The distance for moving the piezoelectric vibrator away from the bonding surface is preferably, for example, in the range of 50 to 150 μm.

[0013]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic partial cross-sectional view of a handset of a mobile phone in which a piezoelectric sounder (or a piezoelectric speaker) according to an embodiment of the present invention is disposed, and FIG. 2 is an embodiment of the present invention used in FIG. It is a schematic sectional drawing of the piezoelectric transducer of an example. In FIG. 2, the thickness of each part is exaggerated for easy understanding.

As shown in FIG. 1, this telephone receiver has a structure in which a piezoelectric transducer 2 which is combined with the housing 1 to form a piezoelectric sounder is mounted on a housing 1. The housing 1 integrally has a fitting portion (projecting portion) 4 for attaching a piezoelectric transducer to an inner wall portion of the housing body 3.
The projection 4 has a cylindrical shape, and has a cutout recess 4a into which the positioning projection half 7f of the piezoelectric transducer 2 is fitted. The housing body 3 has one or more sound emission holes 3a formed in an inner portion surrounded by the protruding portion 4. A ring-shaped spacer P is arranged on the inner periphery of the protrusion 4. The projection 4 has a positioning projection half 7f.
The end of the piezoelectric transducer 2 is fitted through the ring-shaped spacer P in a state where the notch recess 4a is fitted. Specifically, the opening 6c of the front case 6 is
The piezoelectric transducer 2 is fitted to the protrusion 4 so as to face the sound emission holes 3a formed in the housing body 3, that is, so that the opening 6c is covered by the wall of the housing body 3. In this state, a front air chamber R1 is formed between the wall of the housing body 3 and the piezoelectric vibrator 8 of the piezoelectric transducer 2.

As shown in detail in FIG. 2, the piezoelectric transducer 2 is constructed by fitting a back case 7 constituting a second case half to a front case 6 constituting a first case half. The storage case 5 includes a piezoelectric vibrator 8 that vibrates in response to an electric signal. The front case 6 is shown in FIG.
And as shown in the plan view of FIG. 3, an annular bottom wall portion 6a,
A peripheral wall portion 6b extending from the outer peripheral portion is provided so as to surround the outer peripheral portion of the bottom wall portion 6a, and is integrally formed of an insulating resin material made of PPO resin. A circular opening 6c that exposes the metal diaphragm 8a of the piezoelectric vibrator 8 is formed in the bottom wall 6a. A positioning projection half 6d having a rectangular parallelepiped shape is provided on the outer peripheral portion of the bottom wall portion 6a.
Are provided integrally. The peripheral wall 6b has a substantially cylindrical shape having a notch 6e, and the notch 6e is formed at a position corresponding to the positioning projection half 6d.
The notch 6 e is for forming a gap for leading out the lead wires 10 a and 10 b in a state where the back case 7 is fitted to the front case 6. Sealed. A plurality of (three) positioning projections 6f (diaphragm support portions) projecting from the inner wall to the opening 6c side are integrally formed on the inner wall of the peripheral wall portion 6b.
These positioning projections 6f are arranged at equal intervals in the circumferential direction of the peripheral wall portion 6b, and serve to position the piezoelectric vibrator 8 at a predetermined position on the inner wall of the peripheral wall portion 6b.
A bonding surface 6g facing the piezoelectric vibrator 8 is formed on the outer surface of the inner wall of the positioning projection 6f. The joint surface 6g is formed so as to expand (expand in diameter) outward in the radial direction as the distance from the bottom wall portion 6a increases. That is, it is inclined so as to move away from the piezoelectric vibrator 8 toward the center of the piezoelectric vibrator 8.

Back case 7 constituting the second case half
Is a disk-shaped bottom wall 7a and an edge 7a1 of the bottom wall 7a.
And a peripheral wall portion 7b rising from the bottom wall portion 7a so as to remain, and is integrally formed of an insulating resin made of PPO resin similarly to the front side case 6. A leakage hole 7c is formed in the opposing wall 7a. The leakage hole 7c is formed at the center of the opposing wall 7a, and a braking cloth 9 is joined to the opening at one end located inside the rear case 7 of the leakage hole 7c so as to cover the leakage hole 7c. It is pasted. Reinforcing ribs 7d are formed on the inner surface of the bottom wall 7a facing the front case 6. The reinforcing ribs 7d are formed in a lattice shape, and have a shape and dimensions that can increase the strength of the back case 7. The peripheral wall portion 7b has a shape close to an annular shape having a notch portion 7g, and the lead wires 10a, 10a are formed from the notch portion 7g.
The cutout 7g is filled with a sealant 11 made of a silicone rubber-based adhesive.
The outer surface of the inner wall portion of the peripheral wall portion 7b has an inclined surface, that is, a tapered portion 7h.
Are formed. The tapered portion 7h is
Similarly to the joint surface 6g, it is formed so as to spread radially outward (i.e., to increase in diameter) as the distance from the bottom wall portion 7a increases.

The storage case 5 includes an end face 6b1 of the peripheral wall 6b.
The peripheral wall portions 6b, 7b of the front case 6 and the back case 7 are fitted together so that the edge portions 7a1 of the back case 7 come into contact. The end face 6b1 and the edge 7a1 are joined by welding or the like in order to prevent air leakage from the fitting portion between the front case 6 and the back case 7.

The piezoelectric vibrator 8 includes a plate-shaped metal vibration plate 8a and a piezoelectric ceramic provided on the metal vibration plate 8a so as to leave the first electrode portion 8a1 on the outer periphery of the metal vibration plate 8a. 8b and a bonding electrode layer 8c and a non-bonding electrode layer 8d provided on both surfaces of the piezoelectric ceramic 8b. The metal diaphragm 8a is formed of a circular metal plate made of an iron-nickel alloy, and has a thickness of 50 μm in this example. The bonding electrode layer 8c is bonded so as to be electrically connected to the metal diaphragm 8a.
Lead wires 10a and 10b are connected by soldering to the first electrode portion 8a1 and the non-bonding electrode layer 8d, respectively, and the piezoelectric vibrator 8 is provided between the first electrode portion 8a1 and the non-bonding electrode layer 8d. It vibrates in response to the applied electric signal.

FIG. 4 is an enlarged view of a joining portion between the outer peripheral portion of the metal diaphragm 8a, the joining surface 6g and the tapered portion 7h.
As shown in the figure, the outer peripheral portion of the metal diaphragm 8a is connected to the inner wall surface of the peripheral wall portion 6b via an adhesive layer N forming an adhesive layer formed over the entire inner wall surface of the peripheral wall portion 6b. It is joined to the joining surface 6g. The pressure-sensitive adhesive layer N is formed by volatilizing toluene from a pressure-sensitive adhesive in which a pressure-sensitive adhesive material containing an acrylic resin as a main component is dissolved in a solvent composed of 40 to 50% by weight of toluene or the like. In this example, an adhesive layer N having a thickness of 100 μm or less was formed using a solvent-evaporating adhesive sold by Cemedine Co., Ltd. under the trade name of CT-1300. The pressure-sensitive adhesive layer N is formed over substantially the entire inner wall surface and the joining surface 6g of the peripheral wall portion 6b from between the opposing surfaces 6b2 and 7b1 of the peripheral wall portion 6b and the peripheral wall portion 7b. . The outer peripheral portion of the metal diaphragm 8a is housed via the adhesive layer N in a state where the corners 8a2 and 8a3 of the outer peripheral portion are joined to the adhesive layer N without directly contacting the joining surface 6g and the tapered portion 7h. It is arranged in the case 5. In this example, the pressure-sensitive adhesive layer N
After the piezoelectric vibrator 8 is joined to the peripheral wall portion 7b of the back case 7 and the peripheral wall portion 6b of the front case 6, the peripheral wall portion is provided between the metal diaphragm 8a and the tapered portion 7h. 7b
N1 of the pressure-sensitive adhesive layer extruded has moved. Further, in this example, after the piezoelectric vibrator 8 is disposed in the front case 6, the piezoelectric vibrator 8 is joined to the joining surface 6 until the joining between the inner wall surface of the peripheral wall portion 6b and the outer peripheral portion of the piezoelectric vibrator 8 is not separated.
g.

The outer peripheral portion of the metal diaphragm 8a is joined to the inner wall surface of the peripheral wall portion 6b and the joining surface 6g via the adhesive layer N, so that the rear case 7 side of the metal diaphragm 8a has
A rear air chamber R2 is formed in which communication with the front air chamber R1 is blocked. In other words, the piezoelectric vibrator 8 is formed by the adhesive layer N.
An airtight seal portion is formed to prevent communication between a space (front air chamber R1) located on one surface side and a space (rear air chamber R2) located on the other surface side.

The piezoelectric sounder of this example was manufactured as follows. First, an adhesive was applied by an automatic stamping machine from the opposing surface 6b2 of the peripheral wall portion 6b to almost the entire inner wall surface and the joining surface 6g of the peripheral wall portion 6b so as to cover the entire inner wall surface of the peripheral wall portion 6b. Then, the pressure-sensitive adhesive was heated at about 100 ° C. for 5 to 10 minutes and dried to evaporate the toluene to form a pressure-sensitive adhesive layer N. By heating and drying in this way, toluene can be volatilized and crosslinking can be performed simultaneously. afterwards,
The metal vibration plate 8a of the piezoelectric vibrator 8 was pressed onto the adhesive layer N formed on the bonding surface 6g. FIG. 5 is a sectional view showing a state where the metal diaphragm 8a is pressed. Thereafter, the piezoelectric vibrator 8 was moved in the direction away from the bonding surface 6g (arrow T) to such an extent that the bonding between the inner wall of the peripheral wall portion 6b and the outer peripheral portion of the piezoelectric vibrator 8 was not separated. FIG. 6 shows a piezoelectric vibrator 8.
Is a cross-sectional view showing a state in which is moved by a length of L1 in a direction away from the bonding surface 6g. In this example, the moved length L1 was set to 50 to 150 μm. By moving the piezoelectric vibrator 8 in this way, when the metal vibrating plate 8a of the piezoelectric vibrator 8 is pressed onto the adhesive layer N, the adhesive portion N2 ( 6) is separated from the outer peripheral portion of the metal diaphragm 8a, and as shown in FIG.
, The substantial radius of the metal diaphragm 8a increases.

Then, the peripheral wall 6b of the front case 6 and the peripheral wall 7b of the back case 7 are fitted to each other, and then the end surface 6b1 of the front case 6 and the edge 7a1 of the back case 7 are joined by welding to produce piezoelectric sound. The vessel was completed.

In this embodiment, the storage case 5 is constituted by the front case 6 and the rear case 7. However, the storage case is constituted by only one case and fitted to the projection 4 of the housing body 3. You may do so. Further, the number of positioning projections is arbitrary.

[0024]

According to the present invention, the joining surface of the plurality of projections facing the piezoelectric vibrator via the adhesive layer is inclined away from the piezoelectric vibrator toward the center of the piezoelectric vibrator. Therefore, while maintaining the airtightness between the front air chamber and the rear air chamber, it is possible to suppress a decrease in the substantial diameter that substantially determines the natural resonance frequency of the metal diaphragm of the piezoelectric vibrator. As a result, the size of the piezoelectric sounder can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic partial cross-sectional view of a handset of a mobile phone in which a piezoelectric sounder according to an embodiment of the present invention is disposed.

FIG. 2 is a schematic sectional view of a piezoelectric transducer according to an embodiment of the present invention used in FIG.

FIG. 3 is a plan view of a back case of a storage case used for the piezoelectric sounder according to the embodiment of the present invention.

FIG. 4 is an enlarged view of a joining portion between an outer peripheral portion, a tapered portion, and a joining surface of a metal diaphragm used for the piezoelectric sounder according to the embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an embodiment when the piezoelectric sounder according to the embodiment of the present invention is manufactured.

FIG. 6 is a cross-sectional view showing a form when the piezoelectric sounder according to the embodiment of the present invention is manufactured.

[Explanation of symbols]

 2 Piezoelectric transducer 5 Storage case 6 Front side case 6f Positioning protrusion (diaphragm support part) 6g Joining surface 8 Piezoelectric vibrator 8a Metal diaphragm 8b Piezoelectric ceramic element N Adhesive layer

Claims (7)

[Claims] 1. A piezoelectric vibrator including a piezoelectric ceramic element, and a storage case for storing the piezoelectric vibrator, wherein an outer peripheral portion of the piezoelectric vibrator extends around the entire inner wall of a peripheral wall of the storage case. And a plurality of positioning projections for positioning the piezoelectric vibrator at predetermined positions on the inner wall of the peripheral wall portion at predetermined intervals in the circumferential direction. Wherein the bonding surface of the plurality of protrusions facing the piezoelectric vibrator via the adhesive layer is inclined so as to move away from the piezoelectric vibrator toward the center of the piezoelectric vibrator. A piezoelectric sounder characterized by the following. 2. The piezoelectric sounding device according to claim 1, wherein the plurality of protrusions include three or more protrusions arranged at substantially equal intervals in a circumferential direction of the piezoelectric vibrator. 3. The piezoelectric sounder according to claim 1, wherein the adhesive layer comprises an adhesive layer formed by applying an adhesive. 4. A piezoelectric vibrator in which a piezoelectric ceramic element is joined to a metal vibrating plate, and a storage case for storing the piezoelectric vibrator, wherein an outer peripheral portion of the metal vibrating plate is provided in the storage case. A piezoelectric sounder which is joined to an inner wall of a peripheral wall portion over an entire circumference via an adhesive layer, and a diaphragm supporting portion for supporting an outer peripheral portion of the metal diaphragm is formed on the inner wall of the peripheral wall portion. The vibrating plate support portion is formed by three or more protrusions projecting from the inner wall and arranged at substantially equal intervals in a circumferential direction of the metal vibrating plate, and faces the piezoelectric vibrator via the adhesive layer. A piezoelectric sounding device, wherein a joining surface of the plurality of protrusions is inclined so as to move away from the piezoelectric vibrator toward a center of the piezoelectric vibrator. 5. A piezoelectric vibrator including a piezoelectric ceramic element, and a storage case for storing the piezoelectric vibrator, wherein an outer peripheral portion of the piezoelectric vibrator is bonded to an inner wall of a peripheral wall portion of the storage case over the entire circumference. Manufacturing of a piezoelectric sounding device in which a plurality of positioning protrusions for positioning the piezoelectric vibrator at a predetermined position are arranged at predetermined intervals in a circumferential direction on the inner wall of the peripheral wall portion, the bonding being performed via an agent layer. A method, wherein an adhesive is applied to a bonding surface of the inner wall of the peripheral wall portion and the projection facing the piezoelectric vibrator to form the bonding agent layer including an adhesive layer; The piezoelectric vibrator is disposed in the storage case so as to press the piezoelectric vibrator toward a joining surface, and thereafter, the piezoelectric vibrator is moved to such an extent that the joint between the inner wall and the outer peripheral portion of the piezoelectric vibrator does not come off. Child Method for manufacturing a piezoelectric sound producer, characterized in that to move away from the serial junction surface. 6. The method according to claim 5, wherein the piezoelectric vibrator is moved in a direction away from the bonding surface by 50 to 150 μm. 7. A piezoelectric vibrator in which a piezoelectric ceramic element is joined to a metal vibrating plate, and a storage case for storing the piezoelectric vibrator, wherein an outer peripheral portion of the metal vibrating plate is provided in the storage case. A plurality of positioning projections, which are joined to the inner wall of the peripheral wall portion over the entire circumference via an adhesive layer, and position the piezoelectric vibrator at a predetermined position on the inner wall of the peripheral wall portion, are spaced at a predetermined interval in the circumferential direction. And a bonding surface of the plurality of protrusions facing the piezoelectric vibrator via the adhesive layer, the piezoelectric sounding surface being inclined away from the piezoelectric vibrator toward the center of the piezoelectric vibrator. A method of manufacturing a container, wherein an adhesive is applied to a bonding surface of the inner wall of the peripheral wall portion and the protrusion facing the piezoelectric vibrator to form the bonding agent layer including an adhesive layer, The contact of the protrusion The piezoelectric vibrator is disposed in the storage case so as to press the piezoelectric vibrator toward a surface, and thereafter, the piezoelectric vibration is so separated that the inner wall surface and the outer peripheral portion of the piezoelectric vibrator are not separated. A method for manufacturing a piezoelectric sounder, comprising: moving a child in a direction away from the bonding surface.