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JPH10187160

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPH10187160
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a surface-mounted electromagnetic speaker mounted on a printed circuit board.
[0002]
2. Description of the Related Art Various products such as electronic devices are becoming
smaller and lighter with the passage of time, and as a part thereof, not only arithmetic elements,
storage elements and connectors but also various electronic parts are directly mounted on a
printed circuit board It has become The surface mounting type in which the electromagnetic
sounding body, which is a small buzzer, is also directly mounted on the printed circuit board has
become the mainstream, and furthermore, the degree of freedom of the mounting position has
been sought for higher densification of the printed circuit board.
[0003]
However, in order to generate a loud sound at a low frequency, the surface mount type
electromagnetic sound generator can have a wall of the case body on the opposite side of the
diaphragm in addition to the sound release port provided on the wall of the case body
surrounding the diaphragm. It is also necessary to provide an opening, and conventionally, an
opening has been provided in a substrate that forms the bottom of a case fixed to a printed
circuit board of a surface mount type electromagnetic sound generator due to the structural
reason of a mold.
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[0004]
Next, a conventional example will be described using FIGS. 5 and 6.
FIG. 5 is a cross-sectional view showing the surface mount type electromagnetic sounding body
in the conventional example in which an opening is provided in the substrate forming the bottom
of the case body fixed to the printed circuit board mounted on the printed circuit board 511 of a
product such as electronic equipment. FIG. FIG. 6 is a perspective view showing the surface
mount type electromagnetic sound generator of FIG. 5 as viewed obliquely from the lower left.
The surface mount type electromagnetic sound generator mounted on the surface of the printed
circuit board 511 has the following configuration. That is, the lower case 501 directly attached to
the printed circuit board 511 is formed of plastic, and is an external connection terminal for
fixing to the printed circuit board 511 at two corners of the substantially square substrate 501 a
and connecting to the terminals of the printed circuit board 511. A fixed terminal 501f is formed
in the same shape and made of the same material as the external connection terminal 501b at
one corner of the other portion 501b and fixed to the printed substrate 511, and an opening
501d is provided in the substrate 501a. The lower case outer peripheral wall 501c with four
corners chamfered vertically rises from the outer periphery of the column, and from the upper
surface of each corner of the lower case outer peripheral wall 501c, a columnar rib 501e for
fitting with the upper case 509 described later is vertical I'm standing up. A lower chamber 502
is formed by the lower case 501, a diaphragm support member 506 supported by the lower case
501, and a diaphragm 507 described later.
[0005]
A yoke 503 fixed to the upper surface of the substrate 501a is formed of a magnetic material,
and a columnar magnetic core 503a is provided in the center and a hole 503b is provided at a
position corresponding to the opening 501d. A coil 504 is wound around the coil 503 a, and a
cylindrical permanent magnet 505 magnetized in the vertical direction of the cylinder is fixed to
the upper surface of the yoke 503 so as to surround the coil 504. In addition, the both ends of
the coil 504 are respectively connected to two external connection terminals 501b. Thus, the
yoke 503, the coil 504, and the cylindrical permanent magnet 505 constitute an actuator.
[0006]
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Inside the lower case outer peripheral wall 501c of the lower case 501, a diaphragm support
member 506 formed in a tubular shape in contact with the lower case outer peripheral wall 501c
is abutted against the upper surface of the yoke 503 and fixed. A diaphragm 507 is mounted on
the upper end surface of the support member 506. A magnetic pole piece 508 made of a
magnetic material is fixed to the upper surface of the central portion, and the diaphragm 507 has
a suction force by the magnetomotive force of the permanent magnet 505. Is attracted to the
diaphragm support member 506.
[0007]
On the upper end surface of the lower case outer peripheral wall 501c of the lower case 501, an
upper case 509 formed in an outer shape substantially the same as the outer shape of the lower
case outer peripheral wall 501c is fixed.
At the time of fixing, positioning is performed by covering the upper case 509 with the ribs 501
e provided in plural on the lower case 501. The upper case 509 is made of plastic, is provided
substantially parallel to the substrate 501a, and has an upper plate 509a provided with a sound
outlet 509d, an upper case outer peripheral wall 509b which is vertically lowered from the outer
periphery of the upper plate 509a, and a lower surface of the upper plate 509a. A plurality of
diaphragm stoppers 509c are provided, the lower end surfaces of which are opposed to the
upper surface of the diaphragm 507 with a slight gap, and the upper case 510 is formed by the
upper case 509 and the diaphragm 507. The upper case 509 and the lower case 501 are joined
by ultrasonic welding to form a case body. Here, in the conventional example, the method of
positioning the upper case 509 with the rib 501e provided on the lower case 501 as a guide and
bonding to the lower case 501 has been described, but the entire outer surface of the upper end
of the lower case 501 is stepped There is also a method in which the entire inner periphery of
the lower end of the upper case 509 is cut in a step shape, and both are fitted and joined.
[0008]
When mounting the surface mount type electromagnetic sound generator configured in this
manner on a printed circuit board in an electronic device, the two external connection terminals
501b are electrically connected to predetermined terminals of the printed circuit board 511 by
soldering or the like. It adheres with it. Further, one fixed terminal 501 f is fixed to the printed
board 511 by soldering or the like. In the mounted state, the printed circuit board 511 is
provided with a relief hole 511a at a position corresponding to the opening 501d, the housing
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512 is in close proximity to the upper plate 509a of the upper case 509, and the housing 512 is
an upper case A sound emission passage port 512a is provided at a position facing the sound
emission port 509d provided in the 509.
[0009]
Next, the operation of the above-mentioned surface mount type electromagnetic sound generator
will be described. A sound generator drive signal generated from an electronic circuit (not
shown) of the printed circuit board 511 excites the coil 504 from the electrode of the printed
circuit board 511 through the external connection terminal 501 b and cooperates with the
cylindrical permanent magnet 505 to vibrate. The plate 507 is vibrated to make it sound. The
sound produced is emitted to the outside of the housing 512 from the sound emission port 512a
through the sound output port 509d. Further, the back pressure generated with the vibration of
the diaphragm 507 is discharged from the opening 501 d. If the opening 501d is closed, the
back pressure can not escape, so the back pressure suppresses the vibration of the diaphragm
507 and the volume of sound generation becomes smaller. This is especially noticeable at low
frequencies. Therefore, the opening 501d can not be eliminated.
[0010]
As described above, since the opening 501d is provided on the substrate 501a formed at the
bottom of the lower case 501 mainly because of the structure of the mold in plastic molding, the
printed substrate 511 is aligned with the position of the opening 501d. Also, it is necessary to
provide a relief hole 511a, which limits the degree of freedom in the design of the printed circuit
board including the position where the electromagnetic sounding body is fixed on the printed
circuit board, making the printed circuit board denser, multilayer, smaller and lighter. And cost
down.
[0011]
Further, since the sound emission port 509d is provided on the upper plate 509a of the upper
case 509, it is necessary to provide the sound emission passage port 512a in the housing 512 of
the product mounting this electromagnetic sounding body in accordance with the position of the
sound emission port 509d. This has the inconvenience of limiting the design of the housing 512.
[0012]
SUMMARY OF THE INVENTION According to the present invention, it is possible to reduce the
size of a product on which the electromagnetic sounding body is mounted by reducing the
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limitation of the degree of freedom of design of the printed circuit board including the fixed
position of the electromagnetic sounding body on the printed circuit board. Provide a surfacemounted electromagnetic speaker that can produce a large volume of sound at a low frequency
as well as providing an opening on the surface in contact with the printed circuit board while
increasing the degree of freedom in designing the housing of the product. It is said that.
[0013]
In order to achieve the above object, in the surface-mounted type electromagnetic sounding body
of the present invention, a diaphragm, an actuator for vibrating the diaphragm, and the actuator
are internally held. A printed circuit board is formed on a substrate which forms the bottom
portion of the lower chamber, comprising a lower chamber supporting the actuator and the
diaphragm, and a case body forming an upper chamber provided on the opposite side of the
actuator with the diaphragm as a boundary. An external connection terminal for connecting to
the lower chamber is provided, and an opening is provided on an outer peripheral wall of the
lower chamber, and a sound emission port is provided on the upper chamber.
[0014]
In addition, it is characterized in that the opening is a long hole.
[0015]
In addition, the sound emission port is formed on the outer peripheral wall of the case body.
[0016]
Further, the sound emission port is formed on an outer peripheral wall other than the same
surface as the outer peripheral wall of the case body in which the opening is formed.
[0017]
Further, the sound emission port is formed on the outer peripheral wall facing the outer
peripheral wall of the case body in which the opening is formed.
[0018]
Further, the case body is characterized by comprising a lower case forming the lower chamber
and an upper case forming the upper chamber.
03-05-2019
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[0019]
Furthermore, the opening is a notch of the lower case.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be
described based on examples with reference to the drawings.
FIG. 1 is a cross-sectional view showing a surface mount type electromagnetic sound generator
according to a first embodiment of the present invention mounted on a printed circuit board in
an electronic device.
FIG. 2 is a perspective view showing the surface mount type electromagnetic sound generator of
FIG. 1 as viewed obliquely from the lower left.
FIG. 3 is a perspective view showing the surface mount type electromagnetic sound generator of
FIG. 1 as viewed obliquely from the lower right.
The structure of the portion of the first embodiment which is different from the above-described
conventional example will be described with reference to FIGS.
The lower case 1 is provided with an opening 1d formed in a rectangular shape parallel to the
printed circuit board 11 in the lower case outer peripheral wall 1c standing vertically from the
outer periphery of the substrate 1a, and the upper case 9 is vertically made from the outer
periphery of the upper plate 9a. A sound outlet 9d is provided on the upper case outer peripheral
wall 9b to be lowered.
Further, the opening 1d is provided on the back of the sound emission port 9d.
In the embodiment described above, the case body is constituted by the lower case 1 forming the
lower chamber 2 and the upper case 9 forming the upper chamber 10, but the present invention
is not limited to this. The upper case may be covered to the bottom plate to form most of the
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upper and lower chambers.
[0021]
The surface mount type electromagnetic sounding body according to the present invention is
mounted on the printed circuit board 11 in the same manner as the conventional example
described above, but the printed circuit board 11 is a relief as provided on the printed circuit
board 511 in the conventional example described above. The hole 511a is not provided.
Further, the housing 12 is in close proximity above the upper plate 9a of the upper case 9, and
the housing 12 emits sound at a position not far from the direction in which the sound release
port 9d provided in the upper case 9 is opened. A passage port 12a is provided.
The other configuration is the same as that of the conventional example described above, and
thus the description thereof is omitted.
[0022]
As described above, since the opening 1d is provided in the lower case outer peripheral wall 1c
which is a wall other than the substrate 1a formed at the bottom of the lower case 1, it is
necessary to provide a relief hole in the printed circuit board 11 according to the opening 1d.
Instead, the restriction on the degree of freedom in the design of the printed circuit board can be
reduced, including the fixed position of the electromagnetic sounding body on the printed circuit
board.
Therefore, the product mounting the electromagnetic sounding body can be made compact and
inexpensive, and sound can be generated with a large volume at a low frequency as in the case
where the opening is provided at the bottom of the case body.
[0023]
Further, since the sound discharge port 9d is provided on the upper case outer peripheral wall
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9b of the upper case 9, the position of the sound emission passage port 12a provided in the
housing 12 of the product on which the electromagnetic sound generator is mounted matches
the position of the sound discharge port 9d. There is no need for this, and the degree of freedom
of the mounting position relationship is large compared to the conventional structure in which
the sound outlet 9d is provided in the upper plate 9a. That is, if the sound emission port 9d is
directed to the direction of the sound emission passage port 12a provided in the housing 12 of
the product on which the electromagnetic sounding body is mounted, it may be separated to a
certain extent. large. Further, in the present embodiment, since the opening 1d is provided on the
back surface with respect to the sound emission port 9d, the sound emitted from the sound
emission port 9d is attenuated due to the interference by the sound emitted from the opening 1d.
Less. In the present embodiment, the opening 1d is provided on the back side with respect to the
sound emission port 9d, but it is not necessarily limited to the back side, and attenuation of
sound due to interference is reduced if the position is as far apart as possible avoiding the same
surface. Can.
[0024]
FIG. 4 shows a second embodiment in which the opening 101d of the lower case 101 is formed
as a notch. In the present embodiment, processing of the lower case 101 is easy. That is, in the
case where the material of the lower case 101 is plastic and is formed into a cup shape by
injection molding, it is possible to avoid the cost increase of forming the mold into a complicated
horizontal slide type and bending the material of the lower case 101 as metal. In the case of
forming into a cup shape by processing, it is possible to avoid deformation due to the thin
portion of the meat being pulled.
[0025]
Since the present invention is configured as described above, the following effects can be
obtained.
[0026]
By providing an opening on a surface other than the surface in contact with the printed circuit
board in the lower case, the density of the printed circuit board including the mounting position
relative to the printed circuit board is higher than that in the prior art having an opening on the
surface in contact with the printed circuit board. Since the degree of freedom of pattern design
corresponding to the conversion and the multi-layering is high, the product on which the surfacemounted electromagnetic sound generator of the present invention is mounted can be made
small and inexpensive, and thinning and miniaturization can be achieved.
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[0027]
Further, by making the opening portion into a long hole, the opening portion can be made large
even if the surface mount type electromagnetic sounding device is made thin.
[0028]
In addition, by forming the opening in a notched shape, processing of the lower case can be
facilitated without complicating the molding die, and cost reduction can be achieved.
[0029]
Further, by forming the sound emission port on the outer peripheral wall of the case body, the
mounting positional relationship with the position of the sound emission passage port provided
in the product mounted with the surface mount type electromagnetic sound generator of the
present invention is It is large compared with the conventional structure which provided the
sound emission port in the upper surface of the upper case.
[0030]
Furthermore, by providing the opening provided in the lower case at a position away from the
sound emission port, the sound emitted from the sound emission port is less likely to be
attenuated due to interference by the sound emitted from the opening.
[0031]
Brief description of the drawings
[0032]
1 is a cross-sectional view according to the first embodiment of the present invention.
[0033]
2 is a perspective view showing the surface-mounted electromagnetic sounding body of FIG. 1 as
viewed obliquely from the lower left.
[0034]
3 is a perspective view showing the surface-mounted electromagnetic sounding body of FIG. 1 as
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viewed obliquely from the lower right.
[0035]
4 is a perspective view of the surface mount type electromagnetic sound generator of FIG. 1
according to the second embodiment of the present invention as viewed obliquely from the lower
right.
[0036]
5 is a cross-sectional view showing a conventional example.
[0037]
6 is a perspective view showing a state seen obliquely from the lower left of FIG.
[0038]
Explanation of sign
[0039]
1, 101, 501 Lower case 1a, 101a, 501a Substrate 1b, 101b, 501b External connection terminal
1c, 501c Lower case outer peripheral wall 1d, 101d, 501d Opening 1e, 501e Rib 1f, 501f Fixing
terminal 2, 502 Lower chamber 3 , 503 yoke 3a, 503a core 503b hole 4, 504 coil 5, 505
cylindrical permanent magnet 6, 506 diaphragm support member 7, 507 diaphragm 8, 508 pole
piece 9, 109, 509 upper case 9a, 509a Plate 9b, 509b Upper case outer peripheral wall 9c, 509c
Diaphragm stopper 9d, 509d Sound outlet 10, 510 Upper chamber 11, 511 Printed circuit board
511a Relief hole 12, 512 Housing 12a, 512a Sound emission passage opening
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