JPH06295180A - Sounding body - Google Patents

Abstract

PURPOSE:To provide a sounding body easy in assembling, high in assembling precision, capable of surface mounting and automatically assembling and realizing the simplification of an electrode structure. CONSTITUTION:This sounding body is provided with a flat plate part 82 forming a projecting part 81 on the central part, and consisting of a pole piece 8 where a first hole is formed on the flange part (bobbin flange), a coil bobbin 17 wound with a coil and inserted into the projecting part 81 of the pole piece 8 and a projection part 14 to be inserted into the first hole is formed on the flange part and the bobbin terminal 15 connected to the coil is attached to the projection part 14, a surface mounting terminal 5 connected to the bobbin terminal 15 of the coil bobbin 17 and a molding body penetrated horizontally by the surface mounting terminal 5, projected it to the side surface, set with the pole piece 8 on the upper surface and consisting of synthetic resin including a part of the flat plate part 82 of the pole piece 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sounding body that vibrates a diaphragm by excitation of an exciting coil to generate a sound.

[0002]

2. Description of the Related Art With the development of automatic assembly technology, various electronic components mounted on a printed circuit board are mounted using an automatic assembly apparatus. On the other hand, electronic components to be mounted have also been downsized, and small electronic components called chip components suitable for automatic assembly have been used. When mounting such an electronic component on a printed circuit board, cream solder is applied to a component mounting portion on the printed circuit board, a chip component is placed on the component mounting portion, and the melting temperature of the solder is about 240.
A mounting method called surface mounting, in which soldering is performed by setting a high temperature state of about ℃, is adopted. In the technical field of the sounding body, as well as these chip parts, there is a demand for a sounding body capable of performing component mounting and surface mounting by an automatic assembly device for surface mounting.

[0003]

However, in the conventional sounding body, the sounding body to be inserted is grasped by the automatic component inserting device, and the terminals electrically connected to the exciting coil of the sounding body are connected to the printed circuit board. It is mounted by inserting it into an upper mounting portion (for example, a through hole) and performing dip soldering. For this reason, automatic assembly using the surface mounting automatic assembly apparatus has been impossible.

Therefore, according to the present invention, the assembling is easy and the assembling accuracy is high, and the surface mounting and the automatic assembling are possible.
It is an object of the present invention to provide a sounding body having a simplified electrode structure.

[0005]

The sounding body of the present invention is shown in FIG.
11 to 11, a pole piece having a flat plate portion (82) having a convex portion (81) formed in the center and a first hole (83) formed in the collar portion (bobbin collar 12). (8), the coil is wound and fitted into the convex portion of the pole piece, and a protrusion portion (14) to be inserted into the first hole is formed in the collar portion, and the coil portion is formed on the protrusion portion. A coil bobbin (17) to which a bobbin terminal (15) connected to the coil bobbin is attached, a surface mounting terminal (5) connected to the bobbin terminal of the coil bobbin, and the surface mounting terminal penetrating in the horizontal direction and protruding to the side surface. Then, the pole piece is installed on the upper surface side, which is a molded body made of a synthetic resin including a part of the flat plate portion of the pole piece,
The surface mount terminal and the pole piece are fixed by the resin molding, and a second hole (9) is formed at a position matching the first hole, and the second hole is connected to the bobbin terminal. A base (4) which exposes a part of the surface mount terminal to be exposed and has a recess (41) on the back side, and electrically connects the bobbin terminal and the surface mount terminal on the recess side of the base. It is characterized by being connected.

Further, the sounding body of the present invention is characterized in that a connecting portion (30) between the terminal and the surface mount terminal, which are connected to each other on the concave side of the base, is resin-sealed.

[0007]

[Operation] This sounding body is a pole piece, a coil bobbin,
It is equipped with a surface mount terminal, a base, a diaphragm and a container. The base is a molded body integrally molded of synthetic resin,
A pole piece is installed in the molded body by penetrating the surface mount terminal in the horizontal direction during the resin molding. That is,
The pole piece and the surface mount terminal are integrated with the base and are configured as one component including the pole piece and the surface mount terminal, and form a unit of one assembly component.

Therefore, in assembling this sounding body, the coil bobbin is fitted into the convex portion of the pole piece, the bobbin terminal provided on the lower surface side of the coil bobbin is brought into contact with the surface mounting terminal, and both are connected at the concave portion side of the base. To do.

In such a sounding body, the assembling parts are simplified during the manufacturing process, and the sounding body as a product is easily assembled. Since the sounding body is easily and surely sealed, it can be used for surface mounting and automatic assembly on a circuit board by using surface mounting terminals.

[0010]

The present invention will be described in detail below with reference to the embodiments shown in the drawings.

1 to 5 show a first embodiment of the sounding body of the present invention.
1 is a perspective view showing the appearance of a speaker, FIG. 2 is a plan view showing a part of the case of the speaker, and FIG. 3 is a printed circuit board showing the speaker. 2 is a cross-sectional view taken along the line AA ′ of FIG. 2 showing a state of being mounted on the coil bobbin, FIG. 4 is a perspective view showing a coil bobbin, and FIG. 5 is a cross-sectional view showing a disassembled state of the sounding body corresponding to FIG. 2.

The sounding body 1 comprises a container 2 having a sound output port 3,
It is combined with the base 4 including the surface-mounting terminals 5 and the like.

The base 4 is a molded body integrally molded with a high heat resistant molding resin, and uses a high heat resistant resin of a material having substantially the same thermal expansion coefficient as that of the surface mount terminal 5, the magnet 7 and the pole piece 8. Is molded.

A surface mount terminal 5 penetrates and projects from the base 4 in the horizontal direction, and a magnet 7 and a pole piece 8 are provided.
And a casing 10 is formed around the magnet 7 as a support body having a cylindrical shape. This housing 10
A support part 20 extending to the upper surface of the magnet 7 is provided inside the upper part of the
Are formed.

The pole piece 8 is formed by forming a convex portion 81 having a cylindrical shape in the center and a flat plate portion 82 having a circular plate shape which is fixed to the base 4. The magnet 7 having an annular shape is the pole piece. The eight convex portions 81 are wrapped and installed on the flat plate portion 82. Flat plate 8
The first hole 83 is formed in the second hole 2.

The surface mount terminal 5, the magnet 7 and the pole piece 8 are fixed to the base 4 by resin molding of the base 4. In other words, the base 4 includes the surface mount terminal 5, the magnet 7 and the pole. It constitutes one part including the piece 8.

Further, in the case 10, the gap between the upper end of the magnet 7 and the upper end of the supporting portion 20 supporting the diaphragm 19, the tip of the convex portion 81 of the pole piece 8 and the diaphragm 19 are provided.
Magnet 7 to determine the dimensional accuracy of the gap between
Is formed so that a part of the end surface of is exposed.

The ends of the surface-mounting terminals 5 fixed to the base 4 are soldered by surface-mounting to the pattern surface of the printed circuit board 6. Therefore, the ends of the surface-mounting terminals 5 are protruded to the side of the base 4 and are bent to form a base. 4 protrudes to the back side.

The pole piece 8 is, together with the magnet 7, a magnet wire 1 wound around a coil bobbin 17.
A magnetic circuit for passing the magnetism generated by energizing 1 is configured.

The coil bobbin 17 is made of a high heat resistant molding resin, and as shown in FIG. 3, bobbin collars 12 are formed as collar portions on both end sides thereof, and a through hole 16 is formed in the center portion thereof. . A protrusion 14 is formed on one of the bobbin collars 12, and the protrusion 14 and the bobbin collar 1 are formed.
A notch portion 13 is formed in 2. The bobbin terminal 15 is press-fitted into the protrusion 14. The coil bobbin 17 is wound with a magnet wire 11 made of a high heat-resistant special copper wire, and its end is soldered to the bobbin terminal 15 through the notch 13 of the bobbin collar 12.

The pole piece 8 fixed to the housing 10.
The coil bobbin 17 is attached to the protrusion 81 of the pole piece 8 through the through hole 16, and the protrusion 14 is formed in the hole 83 of the pole piece 8.
And is press-fitted into the second hole 9 formed on the bottom side of the housing 10. As a result, after the surface mount terminal 5 and the bobbin terminal 15 are brought into contact with each other, the contact portions are connected by soldering or the like, and the connection portion 30 is sealed with, for example, an epoxy resin or the like.

A vibrating plate 19 is mounted on a supporting portion 20 provided on the inner wall of the housing 10 near the upper end thereof.
A magnetic piece 18 is attached to the center of the. Diaphragm 1
9 is fixed by the magnetic attraction force between the magnetic piece 18 and the magnet 7.

The container 2 is made of a high heat-resistant molding resin, has a sound output port 3 at the bottom, and has a plurality of pendant-like columns 21 on the inner wall surface of the bottom. The pillar 21 may be provided with ribs on its side surface to increase its strength, or may be composed of a plurality of ribs having protrusions at the tip end instead of the pillar 21.

Then, the base 4 and the container 2 are joined to each other, and the joining portion is ultrasonically welded to form the sounding body 1. The column 21 of the container 2 (or a plurality of ribs having protrusions at the tip) has the tip at the diaphragm 1.
It is set so that it does not come into contact with 9 and enters inside the upper end of the base 4, and plays a role of a stopper for preventing separation of the diaphragm 19 due to, for example, impact after assembly.

The sounding body 1 configured as described above is
A liquid-proof label 22 made of a highly heat-resistant film with a silicon adhesive for withstanding a high temperature of about 240 ° C. and preventing the ingress of a cleaning liquid into the sound outlet 3 of the container 2 22
Since it is possible to completely seal the inside of the sounding body 1 by pasting, it is possible to perform surface mounting on the printed circuit board 6 using a mounting method such as an infrared soldering method. Can be washed with a cleaning liquid together with the printed circuit board 6.

In the first embodiment, the bobbin terminal 15 and the surface mount terminal 5 may be joined by any method such as soldering and resistance welding, or a connector method.

The convex pole piece 8 may be integrally molded or may be a combination of separated convex portions. The diaphragm 19 may be made of a non-magnetic material other than the magnetic piece 18.

Further, in the first embodiment, the sounding body which does not include the drive circuit therein has been described as an example, however, the drive circuit may be built in, and the drive circuit is of the self-excited type or the separately excited type. Either may be used.

Next, FIG. 6 to FIG. 8 show a striking type sounding body as a second embodiment of the sounding body of the present invention, and FIG. 6 shows a state in which a part of the case of the sounding body 1 is broken. FIG. 7 is a plan view, FIG. 7 is a sectional view taken along the line AA ′ of the plan view of the sounding body placed on a printed circuit board, and FIG. 8 is an exploded cross-sectional view of the sounding body in FIG.

Similar to the first embodiment, the base 4 is a molded body made of a high heat resistant resin, and has surface mounting terminals 5 for soldering the pattern surface of the printed circuit board 6 by surface mounting. A casing 34 integrally formed with the pole piece 8 forming a magnetic circuit by magnetism generated by energization of the magnet wire 11 wound around the coil bobbin 17 is formed.

The through hole 16 of the coil bobbin 17 is inserted in the convex portion 81 of the pole piece 8 of the housing 34,
The protrusion 14 is press-fitted into the hole 9 provided in the bottom of the housing 34. By this press-fitting, the surface mount terminal 5 and the bobbin terminal 15 are brought into contact with each other, and the base 41 and the recess 41 are connected to each other by soldering or the like. The connecting portion 30 is sealed with, for example, an epoxy resin.

The container 35 is a container-shaped casing made of a high heat-resistant molded resin, and has a magnetic piece 23 for generating mechanical vibration by energizing the magnet wire 11 wound around the coil bobbin 17. A vibration plate 24 provided in the center, a resonance plate 25 that generates sound by a striking force due to mechanical vibration generated by the vibration plate 24, and a sound emission port 3 that emits the sound generated by the resonance plate 25 are provided. . The resonance plate 25 and the vibration plate 24 are attached to the bottom of the container 35 via a spacer 26.

The base 4 and the container 35 are connected to each other,
The sounding body 1 is formed by ultrasonically welding the joint portion of both.

Next, FIGS. 9 to 11 show a percussion type sounding body as a third embodiment of the sounding body of the present invention, and FIG. 9 is a plan view in which a part of the case of the sounding body is cut away, Figure 10
Is a state where the sounding body is placed on the printed circuit board in FIG.
11 is a sectional view taken along the line AA ′ of FIG. 11, and FIG. 11 shows a coil bobbin used for the sounding body.

The coil bobbin 27 is obtained by improving the bobbin terminal 15 of the coil bobbin shown in FIG. 4 into an L type so that resistance welding or the like can be performed, and forms an L type bobbin terminal 28.

The base 4 is a molded body made of a high heat resistant molding resin, and is a surface mounting terminal 5 for soldering the pattern surface of the printed circuit board 6 by surface mounting.
And the magnet wire 1 wound around the coil bobbin 27.
A casing 36 integrally formed by including the pole piece 8 constituting a magnetic circuit with magnetism generated by energizing 1
Are formed. The housing 36 has a recess 29 in which a part of the surface-mounting terminal 5, which is a joint with the bobbin terminal 28, is exposed at the inner bottom, and a surface-mounting terminal 5 at the outer bottom opposite to the recess 29.
And a concave portion 33 having a part thereof exposed. Case 3
The through hole 16 of the coil bobbin 27 is fitted into the convex portion 81 of the pole piece 8 of No. 6, and the projecting portion 14 is inserted into the concave portion 29 to bring the surface mounting terminal 5 and the bobbin terminal 28 into contact with each other, and pressurize and heat both. It is connected by doing.

The method of joining the contact portions is, for example, the electrode 3
Resistance welding, thermocompression bonding, soldering, etc. are performed by applying pressure and heating with 1 and the electrode 32. In the case of only soldering, the contact portion may be pressed and heated by, for example, an electric iron, but in this case, the recess 33 may be closed.

The container 35 is the same as that used in the second embodiment, and the sounding body is obtained by connecting the same in the same manner as in the second embodiment.

In this sounding body, since the base 4 does not penetrate the terminal from the side where the coil bobbin 27 is mounted to the side opposite thereto, if the recess 29 and the recess 33 are completely covered by the surface mounting terminal 5, There is no need to seal the connection 30. Such a structure is applied not only to the striking type sounding body but also to any type of sounding body.

In the above embodiment, the bobbin terminal 2
As a method of joining 8 and the surface-mounting terminal 5, any method such as a connector method other than soldering and resistance welding may be adopted.

Although the above-mentioned sounding body does not include a drive circuit as an example, the sounding body may include a drive circuit.

In this embodiment as well, the drive circuit may be of the self-excited type or the separately excited type.

The sounding body 1 configured as described above is
A liquid-proof label 22 made of a highly heat-resistant film with a silicon adhesive is attached to the container 2 and the sound outlet 3 of the container 35 to withstand the high temperature of about 240 ° C. and to prevent the cleaning liquid from entering. By doing so, it is possible to completely seal the inside of the sounding body 1, so that it is possible to perform surface mounting on the printed circuit board 6 using a mounting method such as an infrared soldering method, and further, to perform printing. Board 6
At the same time, cleaning with a cleaning liquid is possible.

[0044]

As described above, according to the present invention,
The following effects can be obtained. a. The base is a molded body made of synthetic resin in which the surface mounting terminals are horizontally penetrated and pole pieces are installed on the upper surface side, and the pole pieces and the surface mounting terminals are fixed.
Since the base with the surface mount terminals and pole pieces is configured as one assembly part by the resin molding, it is not necessary to consider the positional setting of the surface mount terminals and pole pieces, and the sounding body can be easily assembled. As a result, the assembling cost can be reduced and the assembling cost can be reduced because the assembling accuracy can be improved. b. The sounding body having such an assembling structure has high sealing accuracy, can be adapted to the surface mounting method, and can be automatically assembled by using the surface mounting automatic assembly apparatus using the mounting method. c. In addition, by mounting the coil bobbin on the pole piece, the surface mount terminal integrally attached to the base,
The bobbin terminals can be brought into contact with each other and can be connected to each other on the concave side of the base by soldering or the like, so that the electrode structure can be simplified and the reliability of the electrode structure can be improved. Further, according to the present invention, the connection portion between the surface mount terminal and the bobbin terminal connected on the concave side of the base can be protected by resin sealing, and the reliability of the connection portion can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a sounding body of the present invention.

FIG. 2 is a plan view in which a part of the sounding body shown in FIG. 1 is cut away.

FIG. 3 is a cross-sectional view taken along the line AA ′ of FIG. 2, showing a sounding body placed on a printed circuit board.

FIG. 4 is a perspective view showing a coil bobbin.

5 is a sectional view showing the sounding body shown in FIG. 3 in a disassembled state.

FIG. 6 is a partially cutaway plan view showing a second embodiment of the sounding body of the present invention.

7 is a sectional view taken along the line AA ′ of FIG. 6 in a state where the sounding body shown in FIG. 6 is placed on a printed circuit board.

FIG. 8 is a sectional view showing the sounding body shown in FIG. 7 in a disassembled state.

FIG. 9 is a partially cutaway plan view showing a third embodiment of the sounding body of the present invention.

10 is a cross-sectional view taken along the line AA ′ of FIG. 9 in a state where the sounding body shown in FIG. 9 is placed on a printed board.

FIG. 11 is a perspective view showing a coil bobbin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 sounding body 4 base 5 surface mounting terminal 8 pole piece 9 second hole 12 bobbin collar (flange) 14 protrusion 15 bobbin terminal 17 coil bobbin 30 connection 41 recess 81 convex 82 flat plate 83 first hole

Claims (2)

[Claims] 1. A pole piece having a flat plate portion having a convex portion formed at the center and a first hole formed in a flange portion, and a coil wound around the pole piece and fitted into the convex portion of the pole piece. A coil bobbin, in which a protrusion to be inserted into the first hole is formed in the collar, and a bobbin terminal connected to the coil is attached to the protrusion, and surface mounting of the coil bobbin connected to the bobbin terminal It is a molded body made of synthetic resin in which the terminal and the surface-mounted terminal are pierced in the horizontal direction and protruded to the side surface, the pole piece is installed on the upper surface side, and a part of the flat plate portion of the pole piece is included. Then, the surface mount terminal and the pole piece are fixed by the resin molding, and a second hole is formed at a position matching the first hole, and the second hole should be connected to the bobbin terminal. A part of the surface-mounting terminal is exposed and a base is provided on the back side with a recess, and the bobbin terminal and the surface-mounting terminal are electrically connected on the recess side of the base. Characteristic sounding body. 2. The sounding body according to claim 1, wherein a connection portion between the terminal connected to the concave portion of the base and the surface mounting terminal is resin-sealed.