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JPH10149168

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH10149168
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic sounding body for generating sound by vibrating a diaphragm with an
electromagnet, and in particular, a surface mounting directly mounted on a substrate having a
conductive pattern formed on the surface. Type of electromagnetic sound generator.
[0002]
2. Description of the Related Art With the recent surface mounting of small electronic
components, electromagnetic sounding bodies have also been proposed and commercialized on
the surface mounting type.
[0003]
As a conventional surface mount type electromagnetic sound generator of this kind, there is one
disclosed in Japanese Patent Application Laid-Open No. 8-223693 according to a patent
application filed by the present applicant.
This surface-mounted type electromagnetic sounding body has a miniaturized external shape by
arranging the connecting portion between the end of the coil and the terminal for surface
mounting inside the magnet or in the notch provided in the magnet.
03-05-2019
1
[0004]
SUMMARY OF THE INVENTION The surface-mounted type electromagnetic sounding body can
be made extremely small in size because the connection portion between the coil terminal and
the surface mounting terminal is disposed in the magnet. The present invention has made it
possible to commercialize an unprecedentedly small and thin surface-mounted electromagnetic
speaker.
[0005]
However, if the connection is placed inside the magnet, the diameter of the magnet or coil will be
limited, and if a notch is provided in the magnet, the suction balance of the diaphragm attracted
by the magnet will deteriorate and abnormal vibration will occur, resulting in sound quality
There was a problem that it might decrease.
[0006]
The present invention has been made in view of the above problems, and an object thereof is to
further improve the suction balance of the diaphragm without limiting the diameter of the
magnet or the coil while maintaining the structure capable of miniaturizing the outer shape. It is
an object of the present invention to provide a surface-mounted electromagnetic speaker that can
[0007]
According to the present invention, there is provided a surface-mounted electromagnetic
sounding body comprising: a case; a yoke accommodated in the case; a coil attached to the yoke;
a ring disposed around the coil; The magnet is integrally fixed to the case, the magnet having a
concave portion having a shape in which the lower surface, the inner peripheral surface and the
outer peripheral surface are open, the concave portion opening in the direction of the outer
peripheral surface, the magnet or the support frame. A surface mounting terminal having a joint
portion drawn to the outside and a mounting portion drawn into the concave portion of the
magnet and having the terminal of the coil attached from the opening on the inner peripheral
surface side of the concave portion; , Consists of.
[0008]
The surface-mounted electromagnetic speaker according to the present invention comprises a
case, a yoke housed in the case, a coil attached to the yoke, a ring disposed around the coil, and a
ring and a lower surface and an inner surface. A magnet having a recess whose circumferential
surface is open, a diaphragm supported by the magnet or the support frame, and a joint portion
03-05-2019
2
fixed to the case integrally and drawn out of the case and the recess of the magnet And a
terminal for surface mounting having a mounting portion which is drawn inward and in which an
end of the coil is attached from an opening on the inner peripheral surface side of the concave
portion.
[0009]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The coil terminal and the surface
mounting terminal in the surface mount type electromagnetic sound generator of the present
invention are connected in the concave portion or concave portion of the magnet.
Therefore, the connecting portion does not affect the diameters of the magnet and the coil, and
the shape of the magnet can be made ring-shaped, so that the occurrence of abnormal vibration
can be eliminated.
In particular, even if the magnet is provided with a recess or a recess and the connection
between the coil terminal and the terminal for surface mounting is disposed there, the outer size
does not increase.
[0010]
FIG. 1 is a cross-sectional view showing the structure of a surface-mounted electromagnetic
sound generator according to an embodiment of the present invention, and FIG. 2 is a
perspective view of the surface-mounted electromagnetic sound generator shown in FIG.
In the figure, 2 is a plastic case.
The case 2 in the present embodiment has a box-like outer shape having a rectangular planar
shape, and is composed of an upper case 4 and a lower case 6.
[0011]
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Reference numerals 8 and 10 denote terminals for surface mounting, which are insert-molded on
the bottom of the lower case 6 respectively.
One end of each of the terminals 8 and 10 is drawn to the outside of the lower case 6 to form the
joint portions 8a and 10a, and the other end protrudes on the upper surface of the bottom of the
lower case 6 Are drawn out to form mounting portions 8b and 10b. Further, dummy terminals 7
and 9 are respectively insert-molded on the bottom corner of the bottom of the lower case 6
where the terminals 8 and 10 are not provided.
[0012]
A yoke 12 is composed of a disk-shaped magnetic circuit board 12a provided with a notch 12b in
part so as to escape the attachment portions 8b and 10b, and a center pole 12c rising from the
center of the magnetic circuit board 12a.
[0013]
Reference numeral 14 denotes a ring-shaped coil attached to the outer periphery of the center
pole portion 12 c of the yoke 12.
Two coil terminals 14 a and 14 b are drawn out from the coil 14.
[0014]
A ring-shaped magnet 16 is disposed on the magnetic circuit board 12 a of the yoke 12. The
magnet 16 in the present embodiment is provided with a recessed portion 16a in which the
directions of the lower surface, the inner peripheral surface and the outer peripheral surface are
opened.
[0015]
A support frame 18 is disposed outside the magnet 16.
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[0016]
Reference numeral 20 denotes a diaphragm to which a weight 20a is attached at the center, and
the outer periphery thereof is placed on the support frame 18.
[0017]
The surface-mounted electromagnetic sounding body in the present embodiment is assembled by
assembling the above-mentioned components on the lower case 6 in order.
That is, first, the yoke 12 is fitted and fixed in the lower case 6 in which the terminals 8 and 10
and the dummy terminals 7 and 9 are insert-molded.
At this time, the notch 12b of the yoke 12 is positioned so as to be located at the attachment
portions 8b and 10b of the terminals 8 and 10. Next, the coil 14 is attached to the center pole
portion 12 c of the yoke 12. At this time, the coil terminals 14a and 14b are brought into the
direction of the attachment portions 8b and 10b of the terminals 8 and 10 or are brought into a
entangled carrageenance state. Next, the coil terminals 14a and 14b are soldered to the
mounting portions 8b and 10b, and then the magnet 16 is mounted on the magnetic circuit
board 12a of the yoke 12. At this time, the magnet 16 is positioned so that the connection
portion in which the coil terminals 14a and 14b and the attachment portions 8b and 10b are
connected is accommodated in the recessed portion 16a of the magnet 16. Then, the diaphragm
20 is placed on the support frame 18 so as to face the center pole portion 12 c of the yoke 12
and the magnet 16, and the upper case 4 is covered and fixed thereon.
[0018]
In the surface-mounted type electromagnetic sounding body assembled as described above, the
connection portion where the coil terminals 14a and 14b and the attachment portions 8b and
10b are connected is accommodated in the concave portion 16a of the magnet 16, and The
connecting portion can be disposed within the width between the outer diameter and the inner
diameter of the magnet 16 without changing the diameter or the outer shape of the coil 14.
Further, since the lower surface, the inner peripheral surface, and the outer peripheral surface
side of the magnet 16 are opened in the present embodiment, the recessed portion 16a may be
formed by performing a cutting process after forming a ring-shaped magnet. It can also be
formed during magnet molding.
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[0019]
FIG. 3 is a cross-sectional view showing a surface mount type electromagnetic sound generator
according to a partial modification of the present invention, and FIG. 4 is a perspective view of
the magnet shown in FIG. In this partial modification, the magnet 16 is provided with a recess
16b having an opening in the direction of the lower surface and the inner peripheral surface, and
a ring-shaped step 16c provided on the upper surface of the magnet 16 without providing a
support frame. The diaphragm 20 is supported.
[0020]
In this partial modification, the connection between the coil terminals 14 a and 14 b and the
mounting portions 8 b and 10 b of the terminals 8 and 10 is accommodated in the recess 16 b of
the magnet 16. The recess 16b accommodates the connecting portion between the coil terminals
14a and 14b and the attachment portions 8b and 10b of the terminals 8 and 10, and opens the
lower surface and the inner peripheral surface side minimally necessary for pulling out the coil
terminals 14a and 14b. Therefore, it is possible to minimize the change in the magnetic force and
the strength of the magnet 16 due to the provision of the recess 16b, and it is possible to obtain
a good sound quality.
[0021]
Further, since no support frame is used, it is possible to reduce the number of assembly steps
and the number of parts.
[0022]
In the above embodiment, the concave portion 16a and the concave portion 16b of the magnet
16 are formed by cutting or formed when the magnet 16 is formed, and the material of the
magnet 16 is also the formation of the concave portion 16a and the concave portion 16b.
Depending on the method, it is desirable to appropriately select and use a material that can be
machined, such as iron, chromium and cobalt magnets, a ferrite magnet that facilitates powder
molding, and a plastic magnet that can be injection molded.
[0023]
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Also in the modification example, the diaphragm 20 may be supported by the support frame 18.
[0024]
According to the present invention, since the coil end and the mounting portion for the surface
mounting terminal are connected in the concave portion or the concave portion of the magnet, it
is necessary to change the diameter and the outer shape of the magnet. There is no
For this reason, it is not necessary to increase the inner diameter of the magnet as in the case of
connecting the coil terminal and the terminal inside the magnet, so the restriction of the magnet
diameter is eliminated, and the diaphragm is formed by the ring-shaped surface of the magnet.
Since the suction can be performed, the suction balance of the diaphragm can be improved and
the occurrence of abnormal vibration can be prevented.
[0025]
Brief description of the drawings
[0026]
1 is a cross-sectional view showing the structure of a surface-mounted electromagnetic sound
generator according to an embodiment of the present invention.
[0027]
2 is a partially cutaway perspective view of the surface-mounted electromagnetic sounding body
shown in FIG.
[0028]
3 is a cross-sectional view showing a partially modified example of the surface-mounted type
electromagnetic sound generator shown in FIG.
[0029]
4 is a perspective view of the magnet shown in FIG.
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[0030]
Explanation of sign
[0031]
Reference Signs List 2 case 4 upper case 6 lower case 8, 10 terminal 12 yoke 14 coil 14a, 14b
coil terminal 16 magnet 16a recessed portion 16b recessed portion 16c stepped portion 18
support frame 20 diaphragm
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