JPH08223693A - Surface mounting type electromagnetic sounding body - Google Patents

Abstract

PURPOSE: To provide a surface mounting type electromagnetic sounding body which can facilitate the connection between a coil terminal and a surface mounting terminal and also can be easily turned into a thin and compact structure. CONSTITUTION: The coil terminals 18a and 18b are connected to the terminals 8 and 10 between a coil 18 and a magnet 20 and also on the same plane. Therefore, the magnet 20 never overlaps the connection structure part of both coils 18a and 18b, so that an extremely thin structure is obtained. In addition, the connection structure part of coils 18a and 18b is positioned at the inside of the ma≃t 20 and a microminiature structure is attained. Then the connection job can be extremely facilitated since the attachment parts 8b and 10b of terminals 8 and 10 are protruding upward over a lower case 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic sounding body which produces a sound by vibrating a vibrating plate with an electromagnet, and more particularly to a surface mounting which is directly mounted on a substrate having a conductive pattern formed on its surface. Type electromagnetic sounder.

[0002]

2. Description of the Related Art With the recent surface mounting of small electronic components, a surface mounting type electromagnetic sounding device has been devised and commercialized.

As a conventional surface mount type electromagnetic sounding body of this type, there is one disclosed in Japanese Utility Model Laid-Open No. 61-116492. This electromagnetic sounding body is formed by joining a substrate on the surface of which terminal electrodes for surface mounting are formed and a case containing a coil and the like. In addition, JP-A-2-
There is also a surface mount type electromagnetic sounding body disclosed in Japanese Patent No. 34900, and in this electromagnetic sounding body, a case for accommodating coils and the like is formed by a container and a base.

In the above surface mount type electromagnetic sounding body, terminals required for surface mounting are provided on a substrate or a base, and the terminals and coil terminals are soldered under a magnet, or the coil bobbin terminal is a base. The terminals were electrically connected to the coils by soldering to the terminals on the back side of the.

[0005]

In the above-mentioned conventional surface mount type electromagnetic sounding body, since the coil terminal and the surface mount terminal are connected under the magnet and the coil, they are overlapped in the height direction. It was difficult to reduce the thickness. Further, since the coil terminal and the terminal have to be connected within a very limited space below the magnet and the coil, the connecting work is also difficult.

Therefore, as disclosed in Japanese Unexamined Patent Publication No. 5-80774, a resonance chamber is arranged next to a portion for accommodating a buzzer assembly such as a coil, and the coil terminal is connected to a terminal in the resonance chamber. A surface mount type electromagnetic sounding body configured as above is proposed.

However, in the case of this electromagnetic sounding body, since the buzzer assembly and the resonance chamber are arranged side by side in a plane, the mounting area on the printed circuit board is enlarged and it is not possible to reduce the thickness. Even if it was possible, it could not be miniaturized.

The present invention has been made in view of the above problems, and an object thereof is to provide a surface-mounting type electromagnetic wave which facilitates connection work between a coil terminal and a surface-mounting terminal and which can be made thin and compact. To provide a sounding body.

[0009]

A surface mount type electromagnetic sounding body of the present invention comprises a case, a yoke housed in the case, a coil attached to the yoke, and a magnet arranged around the coil. And a diaphragm supported by the magnet, and an end of the coil that is integrally fixed to the case and is drawn into a space between the coil and the magnet that is drawn to the outside of the case and the coil. A surface mounting terminal having a mounting portion to be mounted.

The surface mount type electromagnetic sounding body of the present invention is
A case, a yoke housed in the case, a coil attached to the yoke, a magnet arranged around the coil and having a notch, and a support frame arranged around the magnet, A vibration plate supported by the support frame, a joint part integrally fixed to the case, drawn out to the outside of the case, and a mounting part drawn out into the cutout part of the magnet to attach the end of the coil. And a terminal for surface mounting.

[0011]

In the surface mount type electromagnetic sound generator of the present invention, the coil terminal and the terminal are connected between the coil and the magnet and on the same plane as the coil and the like. Therefore, the magnet or coil and the connection structure portion of the coil terminal do not overlap each other, and the surface mount type electromagnetic sounding body is extremely thin. Further, since the connecting structure portion of the coil terminal is located inside the magnet, it is not necessary to provide a space for disposing the connecting structure portion of the coil terminal outside the magnet or the support frame, and thus miniaturization is possible. Furthermore, the coil terminal is connected to the terminal very close to the coil, and the terminal mounting part is pulled out so as to project upward from the base part of the lower case. The structure is extremely easy to use.

Further, by providing the magnet with a notch and connecting the coil terminal and the terminal in the notch, it is possible to obtain the same effect as that of the surface mount type electromagnetic sounding body of the present invention.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an exploded perspective view showing the structure of a surface-mounted electromagnetic speaker according to an embodiment of the present invention, and FIGS. 2 to 4 are perspective views of the surface-mounted electromagnetic speaker shown in FIG. It is a sectional view and a plan view. In the figure, 2 is a plastic case. The case 2 in this embodiment has a box-shaped outer shape having a rectangular planar shape, and is composed of an upper case 4 and a lower case 6. The upper case 4 has side walls 4c and 4d.
A concave portion 4a on the outer surface of the concave portion 4a that fits a surface mounting terminal described later.
Is provided at four locations, and the sound output port 4b is provided on the side wall 4e on the left side in the figure. The lower case 6 has a substantially flat plate shape, and has inner walls 6c to 6f near the outer periphery thereof for contacting the inner surfaces of the side walls 4c to 4f of the upper case 4 to position the upper and lower cases 4 and 6. The inner wall 6e is notched at a position corresponding to the sound output port 4b, and is formed so as not to block the sound output port 4b. Further, in the center of the lower case 6, a recess 6a that fits a yoke described later is provided. This recess 6a
Has a substantially circular plane shape in which a part of the circle is recessed from the outer circumference in the radial direction. Further, the lower case 6 is provided with a pedestal portion 6b protruding into the recess 6a from the direction of the sound output port 4b, and a positioning protrusion 6g having a substantially circular planar shape rising from the edge of the recess 6a. . The positioning protrusion 6g
To facilitate the work of connecting coil terminals, which will be described later,
The direction of the sound emission port 4b is cut out.

Reference numerals 8, 10, 12, and 14 denote terminals for surface mounting, which are insert-molded at the four corners of the lower case 6, respectively. Among these terminals, one of the terminals 8 and 10 is pulled out to the outside of the lower case 6 and is folded into the recess 4a of the upper case 4 to join the joints 8a and 1a.
0a is formed, and the other end is pulled out so as to project above the surface of the base portion 6b to form mounting portions 8b and 10b.

Reference numeral 16 is a yoke, which is a recess 6a and a base 6
It is composed of a disk-shaped magnetic circuit board 16a partially provided with a notch 16b so as to fit b and a center pole portion 16c rising from the center thereof.

Reference numeral 18 denotes a center pole portion 16 of the yoke 16.
It is a ring-shaped coil attached to the outer periphery of c. Two coil terminals 18a and 18b are drawn out from the coil 18.

Reference numeral 20 denotes a ring-shaped magnet, which is a yoke 16
The outer diameter is the same as that of the magnetic circuit board 16a. The magnet 20 is formed to have a relatively small thickness, and a ring-shaped step portion 20a is formed on the upper end thereof. The magnet 20 in the present embodiment is made of a material such as an iron / chrome / cobalt magnet that can be cut and is molded.

Reference numeral 22 is a diaphragm having a weight 22a attached at the center. The diaphragm 22 in this embodiment is
The diameter is set to match the step portion 20a of the magnet 20.

The surface-mounted electromagnetic sounding body of this embodiment is assembled by sequentially assembling the above-mentioned components on the lower case 6, and the assembly process will be described with reference to FIGS. 5 to 10. . First, as shown in FIGS. 5 and 6, the yoke 16 is provided in the recess 6 a of the lower case 6 in which the terminals 8, 10, 12, and 14 are insert-molded.
Insert and fix. At this time, the notch portion 16b of the yoke 16 fits the base portion 6b, and the yoke 16 is positioned. Next, the coil 18 is attached to the center pole portion 16c of the yoke 16. At this time, the coil terminal 18
The a and 18b are guided or entangled in the direction of the mounting portions 8b and 10b of the terminals 8 and 10 to be brought into a tangled state. Next, as shown in FIG. 7 and FIG.
a and 18b are soldered to the mounting portions 8b and 10b, and then the magnet 20 is mounted on the magnetic circuit board 16a of the yoke 16. At this time, the magnet 20 is positioned at an appropriate position by the positioning protrusion 6g. Then, as shown in FIGS. 9 and 10, the vibration plate 22 is placed on the stepped portion 20a of the magnet 20, and the upper case 4 is covered from above as shown in FIGS. 3 and 4. The entire circumference of the upper case 4 and the lower case 6 is fixed by ultrasonic welding, an adhesive agent or the like, and is completed.

In the surface mount type electromagnetic sounding body assembled as described above, as shown in FIG. 9, between the four corners in the case 2 and the diaphragm 22 and the upper case 4 as shown in FIG. Resonance chambers 24 and 26 are formed, respectively. Diaphragm 2
The sound uttered by the vibration of 2 has its sound pressure increased in the resonance chambers 24 and 26 and is emitted from the side sound emitting port 4b.
It should be noted that the sound output port 4b is provided on any of the side walls 4c to 4 of the upper case 4.
It may be provided on the f, or may be provided on the upper wall 4g of the upper case 4.

Further, although the mounting portions 8b and 10b of the terminals 8 and 10 in this embodiment have a substantially cylindrical shape,
In addition to this, as shown in FIGS.
It is also possible to change the shapes of a and 18b so that they are more easily entangled. In this way, the mounting portions 8b and 10b of the terminals 8 and 10 are
By changing the shape of the coil ends 18a, 18
The attachment of b is facilitated, and the workability of the subsequent soldering can be improved.

On the back surface of the lower case 6 in this embodiment,
Protrusions 6h and 6i are provided for positioning the surface mount type electromagnetic sounding body when it is mounted on a mother board such as a printed circuit board. Therefore, by providing the concave portion or the small hole at the mounting position of the mother board, the positioning of the surface mount type electromagnetic sounding body can be facilitated, and the movement or the drop in the transportation or the reflow can be prevented. The projections 6h and 6i are provided as needed,
It does not have to be provided.

In the present embodiment, the size of the resonance chamber and the size of the resonance chamber can be changed by simply changing the diameters of the magnet 20 and the yoke 16 or the size of the case 2 without changing the basic structure. The shape can be changed to increase the sound pressure or minimize the outer shape. That is, the surface mount type electromagnetic sounding body shown in FIGS. 15 to 17 has basically the same structure as that shown in FIG. 1, and the vibration plate 22, the magnet 20, and the yoke 16 have a smaller diameter. 52, the magnet 50, and the yoke 46, and further the lower case 6 includes the magnet 50 and the yoke 4.
6 is changed to a lower case 36 having a recess 36a and a positioning protrusion 36g. With such a change, the resonance chamber 54 around the magnet 50 can be greatly expanded as shown in FIGS. 16 and 17 without changing the outer shape and size of the case 2 as shown in FIG. it can. The surface mount type electromagnetic sounding body shown in FIGS. 18 to 20 is obtained by changing the case 2 of FIG. 1 into a case 62 having a wider resonance space. This case 62
Is composed of an upper case 64 and a lower case 66 obtained by extending the case 2 shown in FIG. 1 in the direction of the sound output port.
By using the upper case 64 and the lower case 66, the space between the magnet and the sound output port 64b is widened, and this space can also be used as the resonance chamber 74. Further, the surface-mounted electromagnetic sounding body shown in FIGS. 21 to 23 has a diaphragm 102, a magnet 100, and a yoke 96 as shown in FIG.
The diameter of the upper case 84 and the lower case 86 are reduced.
The case 82 consisting of and is also made smaller. In this surface mount type electromagnetic sounding body, since the size of the coil is not changed, the capacity of the electromagnet can be made almost the same as that shown in FIG. 1, and the minimum sound pressure that can be practically obtained. It will be shaped.

FIG. 24 is an exploded perspective view showing a surface-mounted electromagnetic speaker according to another modification of the present invention, and FIG. 25 is FIG.
FIG. 26 is a sectional view of the surface-mounted electromagnetic speaker shown in FIG. 26, and FIG. In this partially modified example, a substantially C-shaped magnet 120 and a ring-shaped support frame 130 that supports the diaphragm are used. The magnet 120 has a substantially C shape as if a part of the ring was cut out.
It has a shape and is set so that the base portion 6b of the lower case 6 can be accommodated in the cutout portion 120a. The magnet 120 is arranged inside the positioning protrusion 6g of the case 6 and is fixed to the magnetic circuit board 16a of the yoke 16. The support frame 130 is arranged outside the magnet 120, and is positioned by the positioning protrusion 6g. On the upper part of the support frame 130, the ring-shaped step portion 1
30a is provided, and the vibration plate 2 is provided at this step 130a.
Supports 2. In this partially modified example, the coil terminals 18 a and 18 b are the magnets 1 inside the support frame 130.
The mounting portions 8b of the terminals 8 and 10 in the notch 120a of 20,
It will be attached to 10b. Therefore, the support frame 1
If the outer diameters of 30 and the magnet 20 shown in FIG. 1 are the same, the magnet can be changed without changing the structure or size of the case 2, the coil 18, and the like. This magnet 120
Since has a shape that is relatively easy to process, not only iron, chrome, and cobalt magnets that can be cut, but also ferrite magnets that are easily powder-molded can be used.

Even in the partially modified example in which the magnet 120 and the support frame 130 are used, the sound pressure can be increased or the size can be reduced by further modifying as shown in FIGS. 15 to 23.

[0026]

According to the present invention, the coil terminal and the mounting portion of the surface mounting terminal are connected between the coil and the magnet or in the cutout portion of the magnet. It is possible to provide an extremely thin surface-mounted electromagnetic sounding body that does not overlap the connection structure portion.

Further, in the present invention, since the connection structure portion of the coil terminal is arranged inside the magnet and the support frame, the space for arranging the connection structure portion of the coil terminal is provided outside the magnet and the support frame. There is no need. For this reason,
It can be miniaturized, and the mounting area on a motherboard such as a printed circuit board can be minimized.

Further, since the coil terminal according to the present invention is connected to the terminal at a position extremely close to the coil and does not need to be pulled out to the bottom or outside of the magnet as in the conventional example, it is extremely easy to reach the terminal mounting portion. I can guide you. Further, since the mounting portion of this terminal is drawn out so as to project upward from the base portion of the lower case, the coil terminal can be easily removed and the soldering work can be extremely facilitated.

Furthermore, without changing the basic structure,
Since it is possible to arbitrarily change the sizes of the case, the magnet, etc., it is possible to easily adapt to various devices.

Further, since the respective components are designed to be mounted in the case in order from the top, automatic assembly is easy, and the yield can be improved, the number of steps can be reduced, and the mass productivity can be improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing the structure of a surface-mounted electromagnetic speaker according to an embodiment of the present invention.

FIG. 2 is a perspective view of the surface-mounted electromagnetic speaker shown in FIG.

FIG. 3 is a sectional view of the surface-mounted electromagnetic sounding body shown in FIG.

FIG. 4 is a plan view of the surface-mounted electromagnetic speaker shown in FIG.

5 is a plan view showing a state where a yoke and a coil are incorporated in the lower case shown in FIG.

6 is a cross-sectional view of the lower case and the like shown in FIG.

7 is a plan view showing a state where a magnet is incorporated in the lower case shown in FIG.

8 is a cross-sectional view of the lower case and the like shown in FIG.

9 is a plan view showing a state where a vibration plate is incorporated in the lower case shown in FIG.

10 is a cross-sectional view of the lower case and the like shown in FIG.

11 is a cross-sectional view showing a modified example of the shape of the mounting portion of the terminal shown in FIG.

12 is a cross-sectional view showing a modified example of the shape of the mounting portion of the terminal shown in FIG.

13 is a cross-sectional view showing a modified example of the shape of the mounting portion of the terminal shown in FIG.

14 is a cross-sectional view showing a modified example of the shape of the mounting portion of the terminal shown in FIG.

15 is a perspective view showing a modified example in which the lower case, the magnet, and the yoke of the surface-mounted electromagnetic speaker shown in FIG. 1 are modified.

16 is a plan view showing a state in which the upper case and the diaphragm of the surface-mounted electromagnetic speaker shown in FIG. 15 are removed.

FIG. 17 is a cross-sectional view of the surface mount electromagnetic speaker shown in FIG.

FIG. 18 is a perspective view showing a modified example in which the case of the surface mount type electromagnetic sounding body shown in FIG. 1 is modified.

19 is a plan view showing a state in which the upper case and the diaphragm of the surface-mounted electromagnetic speaker shown in FIG. 18 are removed.

20 is a sectional view of the surface-mounted electromagnetic speaker shown in FIG.

FIG. 21 is a case of the surface mount type electromagnetic sounding body shown in FIG.
It is a perspective view which shows the modification which changed the diaphragm, the magnet, and the yoke.

22 is a plan view showing a state in which the upper case and the diaphragm of the surface-mounted electromagnetic speaker shown in FIG. 21 are removed.

FIG. 23 is a cross-sectional view of the surface mount electromagnetic speaker shown in FIG. 21.

FIG. 24 is an exploded perspective view showing a surface-mounted electromagnetic speaker according to another modification of the present invention.

FIG. 25 is a cross-sectional view of the surface-mounted electromagnetic speaker shown in FIG. 24.

26 is a plan view showing a state in which the upper case and the diaphragm of the surface-mounted electromagnetic speaker shown in FIG. 24 are removed.

[Explanation of symbols]

 2, 62, 82 case 4, 64, 84 upper case 6, 36, 66, 86 lower case 8, 10 terminals 16, 46, 96 yoke 18 coil 18a, 18b coil terminal 20, 50, 100, 120 magnet 20a stepped portion 22, 52, 102 diaphragm 120a notch 130 support frame

Claims (2)

[Claims] 1. A case, a yoke housed in the case, a coil attached to the yoke, a magnet arranged around the coil, a diaphragm supported by the magnet, and the case. A terminal for surface mounting, which is integrally fixed, and has a joint part that is drawn out of the case, and a mounting part that is drawn into the space between the coil and the magnet and to which the end of the coil is attached; A surface-mounted electromagnetic sounding body characterized by: 2. A case, a yoke housed in the case, a coil attached to the yoke, a magnet arranged around the coil and having a notch, and arranged around the magnet. A support frame, a diaphragm supported by the support frame, a joint part that is integrally fixed to the case, is drawn to the outside of the case, and is drawn into the cutout part of the magnet to attach the end of the coil. A surface-mounting electromagnetic sounding body, comprising: