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JPH09281972

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPH09281972
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic speaker that generates sound by vibrating a diaphragm with an electromagnet,
and more particularly to a case structure capable of maximizing the diameter of the diaphragm. .
[0002]
2. Description of the Related Art Among the conventional electromagnetic sounding bodies,
surface-mounted type electromagnetic sounding bodies which are becoming smaller and thinner
in particular have structures as shown in FIG. 7 to FIG. That is, in the surface mount type
electromagnetic sounding body shown in FIGS. 7 and 8, both the lower case 2 and the upper case
4 have a rectangular planar shape, and after each component is housed in the lower case 2, the
upper case 4 was covered and joined. In the lower case 2, a circular recess 2 a is provided in the
substantially upper two thirds in FIG. 7, and a rectangular recess 2 b is provided in the
substantially lower third. ing. The portions other than the recessed portions 2a and 2b are wall
portions 2c having a large thickness. In the recess 2a of the lower case 2, a yoke 10 to which a
coil 8 is attached is disposed at the center, and a ring magnet 12 is disposed to surround the coil
8, and a ring vibration is further provided outside thereof. A plate support frame 14 is disposed.
The diaphragm support frame 14 has a step 14a formed on the top thereof, and the diaphragm
14 is supported by the step 14a. On the other hand, the electrode 18 is exposed in the recess 2 b,
and the terminal of the coil 8 is connected to this. In this electromagnetic speaker, the entire
outer periphery of the diaphragm support frame 14 is positioned and held by being in contact
with the inner periphery of the recess 2a, that is, the wall 2c. It has a structure that is externally
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fitted to the
[0003]
On the other hand, in the surface mount type electromagnetic sounding body shown in FIGS. 9
and 10, the diaphragm support frame 24 having a shape conforming to the substrate 22 and the
diaphragm support frame 24 on the substrate 22 also functioning as the lower case. An insertmolded integrated yoke 26 is fixed at the center, a coil 28 is attached at the center of the yoke
26, and a ring-shaped magnet 30 is disposed around the periphery, and an annular protrusion
24a of the diaphragm support frame 24 is formed. The diaphragm 32 is placed on the upper
side, and the upper case 34 is covered from the upper side.
[0004]
As in the case of the above-mentioned surface-mounted type electromagnetic sounding body, in
the case where further reduction in size and thickness is desired, the sound pressure decreases
as the size of the sounding body decreases along with the outer shape. There was a problem of
Therefore, in order to increase the sound pressure as much as possible, it was necessary to
miniaturize only the case and make the diaphragm as large as possible.
[0005]
However, in the conventional surface-mounted type electromagnetic sounding body shown in
FIGS. 7 and 8, the diaphragm support frame 14 is held all around by the thick wall portion 2 c,
and the upper case 4 is outside the lower case 2. It is structurally difficult to reduce the distance
from the outer peripheral surface of the diaphragm support frame 14 to the outer surface of the
upper case 4 because the structure is externally fitted. Therefore, in order to miniaturize the
upper and lower cases 2 and 4, it is necessary to miniaturize the diaphragm 16, and when the
diameter of the diaphragm 16 is increased, it is necessary to enlarge the upper and lower cases 2
and 4 as well. .
[0006]
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Further, in the surface mount type electromagnetic sounding body shown in FIGS. 9 and 10, an
annular projection 34a is provided on the inner upper surface of the upper case 34 in order to
restrict the lateral displacement of the diaphragm 32. The projection 34 a is configured to be
inserted between the annular projection 24 a of the diaphragm support frame 24 and the inner
side surface of the upper case 34. For this reason, it is necessary to provide a space between the
annular projection 24a of the diaphragm support frame 24 and the inner side surface of the
upper case 34, and this space hinders the miniaturization of the case or the enlargement of the
diaphragm. There was a problem called.
[0007]
The present invention has been made in view of the problems of the above-described
conventional example, and an object thereof is a surface mount type electromagnetic sounding
that makes it possible to maximize the diameter of the diaphragm without enlarging the case
outer shape. It is in providing the case structure of the body.
[0008]
SUMMARY OF THE INVENTION The case structure of the surface mount type electromagnetic
sound generator of the present invention is a surface mount type electromagnetic sound
generator which generates a sound by vibrating a diaphragm supported by a diaphragm support
ring by an electromagnet. The lower case has a plurality of projecting walls that project from the
corner portion of the inner bottom surface and position and hold the diaphragm support ring
from the outer peripheral side, and an upper case fitted to the lower case.
[0009]
The case structure of the surface mount type electromagnetic sound generator according to the
present invention is a surface mount type electromagnetic sound generator that generates a
sound by vibrating a diaphragm supported by a diaphragm support ring with an electromagnet,
wherein the vibration is generated on the inner bottom surface. The lower case on which the
plate support ring is placed, and the inner upper surface are formed at positions corresponding
to the corners of the inner bottom surface of the lower case, and are fitted to the lower case to
thereby surround the diaphragm support ring. And an upper case having a plurality of projecting
walls positioned and held from the side.
[0010]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the case structure of the
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surface mount type electromagnetic sounding body of the present invention, a plurality of
projecting walls for positioning and holding the diaphragm support ring from the outer
peripheral side are provided at the corners of the inner bottom of the lower case. There is.
When the planar shape of the lower case is rectangular or polygonal, a gap is generated between
the outer peripheral surface of the ring-shaped diaphragm support ring and the lower case
corner.
In the present invention, a projecting wall is provided at the corner where the gap is generated,
and the projecting wall positions and holds the diaphragm support ring.
Therefore, the inner side surface of the lower case other than the corner portion and the
diaphragm support ring can be closely approached, and the diameter of the diaphragm can be
maximized.
[0011]
In addition, a projecting wall is provided on the inner upper surface of the upper case
corresponding to the corner portion of the lower case, and the upper case is covered with the
lower case, whereby the diaphragm support ring housed in the lower case is the projecting wall
of the upper case. It is also possible to change to position and hold.
[0012]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 is a plan view showing a
state in which an upper case and a diaphragm of a surface mount type electromagnetic sounding
body according to an embodiment of the present invention are removed, and FIG. 2 and FIG. It is
-D sectional drawing.
A lower case 40 made of plastic or the like comprises a bottom portion 40a having a rectangular
or polygonal planar shape, a side wall 40b projecting upward from the periphery thereof, and a
projecting wall 40d projecting from an inner bottom surface 40c of the bottom portion 40a. It is
configured. The bottom portion 40a in the present embodiment is formed to have an octagonal
planar shape in which four corners of a square are cut off. Further, the protruding wall 40d
protrudes from the inner bottom surface 40c of the corner portion 42 formed between the
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corner of the bottom portion 40a and the side wall 40b and the diaphragm support ring
described later. The projecting wall 40d in the present embodiment is formed of a curved surface
whose inner circumferential surface 40e conforms to a diaphragm support ring described later,
and is formed in each of the four corner portions 42. Further, the protruding wall 40d protrudes
upward higher than the side wall 40b and a diaphragm support ring described later, and as
shown in FIG. 3, a stepped portion 40f is formed between the protruding wall 40d and the side
wall 40b. Its height is equal to the side wall 40b. Furthermore, the projecting wall 40d also
regulates the movement of the diaphragm in the radial direction, which will be described later.
[0013]
A yoke 46 has a disk shape and a pole formed at the center, and is housed in the center of the
lower case 40. A coil 44 is attached to the center of the yoke 46, and its end is connected to the
insert-molded electrodes 48, 50 when the lower case 40 is formed. A C-shaped magnet 52 is
disposed on the outside of the coil 44, and a diaphragm support ring 54 is disposed on the
outside thereof. The diaphragm support ring 54 supports the diaphragm 55 placed at the upper
end thereof so as to face the electromagnet constituted by the yoke 46, the coil 44 and the
magnet 52, and the projection of the lower case 40 described above It is positioned and held
from the outer peripheral side by the wall 40d. In the present embodiment, the disk-like portion
46a of the yoke 46 is also positioned by the projecting wall 40d and fixed to the inner bottom
surface 40c of the lower case 40.
[0014]
Reference numeral 56 denotes an upper case, which comprises a lid 56a having the same planar
shape as the bottom 40a of the lower case 40, and a side wall 56b projecting from the peripheral
edge thereof. A projection 56d which protrudes downward is provided on the inner upper
surface 56c of the cover 56a of the upper case 56, and the position of the diaphragm 55 is
restricted to the upper side. The upper case 56 is externally fitted to the projecting wall 40d of
the lower case 40, and also engages with the step 40f as the lower surface of the side wall 56b
and the upper surface of the side wall 40b of the lower case 40 engage. Here, the engaging
portion at the periphery of the case is joined by ultrasonic welding, adhesion, or the like to fix
and integrate the lower case 40 and the upper case 56.
[0015]
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In the surface-mounted electromagnetic speaker having the above configuration, the diameter of
the diaphragm 55 can be increased until the outer periphery of the diaphragm 55 is inscribed in
the side wall 40 b of the lower case 40. In order to maximize the diameter of the diaphragm 55
in this manner, it is necessary to enlarge the diaphragm support ring 54 to approximately the
same diameter. Thus, even when the diaphragm 55 and the diaphragm support ring 54 are set to
the maximum diameter, a gap always occurs in the corner 42 between the corner of the side wall
40b of the lower case 40 and the diaphragm support ring 54, As described above, the projecting
wall 40d is formed in the corner portion 42 which is generated as a useless space. For this
reason, there is no need to provide a space for forming the projecting wall 40d for positioning
and holding the diaphragm support ring 54, and the diaphragm 55 and the diaphragm support
ring 54 can be enlarged to contact the side wall 40b. It becomes possible.
[0016]
In the present embodiment, the projecting wall 40d of the lower case 40 is formed at four
locations, but when the shape of the lower case 40 is changed to a quadrangle or another
polygon, the number may be adjusted to fit the shape. You may increase or decrease the
[0017]
4 to 6 are views showing a partial modification of the case structure shown in FIG. 1 etc. FIG. 4 is
a plan view showing a state in which the upper case of the surface mount type electromagnetic
sounding body and the diaphragm are removed, Is a plan view of the upper case as viewed from
below, and FIG. 6 is a cross-sectional view taken along the line E-E of FIG.
In this modification, a protruding wall 56e is provided on the inner upper surface 56c of the
upper case 56 in place of the protruding wall 40d provided on the lower case 40. The projecting
wall 56e in this modification has the same shape as the projecting wall 40d described above, and
between the corner of the bottom surface 40a and the side surface 40b of the lower case 40 on
the inner upper surface 56c and the diaphragm support ring 54. It is formed in the position
corresponding to the corner part 42 currently formed. Further, the projecting wall 56e protrudes
downward so as to be higher than the side wall 56b, and as shown in FIG. 6, a step 56f is formed
between the projecting wall 56e and the side wall 56b, and the height thereof is the side wall
56b. It is set to be equal to As described above, in the present modification, the upper case 56 is
provided with the projecting wall 56e, and the structure of each portion other than the operation
/ effect or the projecting wall 56e is the case structure shown in FIG. 1 to FIG. Is the same as
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[0018]
According to the present invention, since the projecting wall is provided at the corner portion of
the lower case or the upper case to position and hold the diaphragm support ring, the diaphragm
can be enlarged to the inside of the case. Sound pressure characteristics can be improved without
increasing the size of the case. Also, conversely, the case can be further miniaturized without
degrading the sound pressure characteristic.
[0019]
In addition, since one of the upper case and the lower case can be positioned and held by
externally fitting one of the upper case and the lower case to the other projecting wall, it is
necessary to provide a step or other structure for positioning and holding the upper case and the
lower case. The structure of the upper case and the lower case can be made as simple as possible,
the yield can be improved by the improvement of the formability and the assemblability, and the
number of man-hours such as mold processing and maintenance can be reduced.
[0020]
Furthermore, although the surface-mounted electromagnetic sounding body having the structure
as shown in the embodiment using the C-shaped magnet is originally a structure suitable for
miniaturizing the outer shape, the present invention is not limited to this surface-mounted
electromagnetic sounding body. In addition to adopting the invention and making the upper and
lower cases into a shape in which the four corners of a square are cut off, interference with other
electronic components can be reduced on the substrate on which the surface-mounted
electromagnetic speaker is mounted. Density mounting can be enabled.
[0021]
Furthermore, according to the present invention, it is possible to further miniaturize the sound
pressure while keeping the structure for enabling automatic mounting such as taping as it is.
[0022]
In addition, since the diaphragm can be positioned in the radial direction by the projecting wall
provided on the upper case or the lower case, the upper surface shape on which the diaphragm
of the diaphragm support ring is placed is complicated as in the prior art. There is no need to use
a shape that has been subjected to processing, chamfering, etc., and a flat surface may be used,
so that the number of processing steps can be reduced and cost can be reduced.
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[0023]
Brief description of the drawings
[0024]
1 is a plan view showing a state in which the upper case and the diaphragm of the surface mount
type electromagnetic sound generator according to the embodiment of the present invention are
removed.
[0025]
2 is a cross-sectional view showing a state in which the upper case and the diaphragm are
mounted in a cross section on a cross section C-C of the surface mount type electromagnetic
sounding body shown in FIG.
[0026]
3 is a cross-sectional view showing a state in which the upper case and the diaphragm are
mounted in a cross section on a cross section D-D of the surface mount type electromagnetic
sounding body shown in FIG.
[0027]
4 is a plan view showing a state in which the upper case and the diaphragm have been removed
from a part of the surface mount type electromagnetic sound generator shown in FIG.
[0028]
5 is a plan view of the upper case of the surface mount type electromagnetic sound generator
shown in FIG. 4 as viewed from below.
[0029]
6 is a cross-sectional view showing a state in which the upper case and the diaphragm are
mounted in a cross section on the E-E cross section of the surface mount type electromagnetic
speaker shown in FIG.
[0030]
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FIG. 7 is a plan view showing a state in which the upper case and the diaphragm of the
conventional surface mount type electromagnetic sound generator are removed.
[0031]
8 is a cross-sectional view showing a state in which the upper case and the diaphragm are
mounted in a cross section on the cross section A-A of the surface mount type electromagnetic
sounding body shown in FIG.
[0032]
FIG. 9 is a plan view showing a state in which the upper case of another conventional surfacemounted electromagnetic speaker is removed.
[0033]
10 is a cross-sectional view showing a state in which the upper case is mounted in a cross-section
on the cross section BB of the surface-mounted type electromagnetic sounding body shown in
FIG.
[0034]
Explanation of sign
[0035]
40 lower case 40a bottom portion 40b side wall 40c inner bottom surface 40d projecting wall
40e inner circumferential surface 42 corner portion 44 coil 46 yoke 48, 50 electrode 52 magnet
54 diaphragm support ring 55 diaphragm 56 upper case 56a cover 56b side wall 56e projecting
wall 56c Internal top surface
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