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JP2005236533

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DESCRIPTION JP2005236533
PROBLEM TO BE SOLVED: To provide a speaker in which a cross-sectional shape of a groove for
fixing a coil bobbin is reviewed. A speaker SP includes a diaphragm 10 on an outer peripheral
side, a diaphragm 11 on an inner peripheral side connected to an inner peripheral edge of the
diaphragm 10 on an outer peripheral side, a diaphragm 10 on an outer peripheral side, and a
diaphragm on an inner peripheral side. 11 has a groove 13 provided at the connection point 12
with the coil 11 and a coil bobbin 5 fixed in a state where one end is in the groove 13 and the
cross section of the speaker SP in the groove 13 in the radial direction has a wide opening side It
becomes narrower toward the bottom. [Selected figure] Figure 1
スピーカ
[0001]
The present application belongs to the technical field of speakers.
[0002]
As a conventional speaker, a fixing groove corresponding to the groove portion of the present
invention is a connecting portion of the diaphragm integrally formed with a connecting portion
connecting the dome portion corresponding to the diaphragm of the present invention and the
edge portion corresponding to the edge of the present application. A technique for fixing the coil
bobbin by providing the above was disclosed (e.g., Patent Document 1 (FIG. 2)).
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1
Japanese Patent Laid-Open No. 2002-125290
[0003]
However, the fixing groove disclosed in the above prior art has a square radial cross-sectional
shape of the speaker. That is, in the radial cross section, the widths of the opening side and the
bottom side of the groove are the same, and the corners of the bottom are perpendicular.
[0004]
In this case, when the diaphragm made of a metal material is press-worked, mold separation from
the press mold is bad and the processability is bad. In addition, since there is a corner at the
bottom of the fixing groove, when a viscous metal material such as an aluminum thin plate or a
stainless steel thin plate is used for the diaphragm, the press mold is easily damaged.
Furthermore, the workability when pouring an epoxy resin adhesive having poor fluidity into the
fixing groove is poor. Since the adhesive also enters the portion that does not contribute to
adhesion, such as the bottom corner, the diaphragm becomes heavy, and drying of the adhesive
takes time, resulting in poor workability. Since the diaphragm is heavy, vibration propagation is
bad and it is difficult to faithfully reproduce the sound with respect to the audio signal. The
production cost is high because the adhesive is used more than necessary.
[0005]
In order to solve the problems described above, the purpose of the present application is to
provide a speaker in which the cross-sectional shape of the groove for fixing the coil bobbin is
reviewed.
[0006]
Hereinafter, the present application will be described.
In addition, in order to facilitate the understanding of the present application, the reference
numerals of the attached drawings are appended in parentheses, but the present application is
not limited to the illustrated embodiment.
12-05-2019
2
[0007]
In order to solve the above-mentioned problems, the loudspeaker (SP) according to claim 1
comprises a diaphragm (10) on the outer peripheral side and an inner peripheral diaphragm
connected to the inner peripheral edge of the diaphragm (10) on the outer peripheral side. 11),
the groove (13) provided in the connection portion (12) between the outer peripheral side
vibration plate (10) and the inner peripheral side vibration plate (11), with one end entering the
groove (13) The cross section of the groove (13) in the radial direction is characterized in that
the opening side is wider and narrower in the bottom direction.
[0008]
In order to solve the above problems, the loudspeaker (SP) according to claim 2 comprises an
outer peripheral side diaphragm (10) and an inner peripheral side diaphragm connected to the
inner peripheral edge of the outer peripheral side diaphragm (10) 11), the groove (13) provided
in the connection portion (12) between the outer peripheral side vibration plate (10) and the
inner peripheral side vibration plate (11), with one end entering the groove (13) The coil bobbin
(5) is fixed, and the radial cross section of the speaker (SP) in the groove (13) is characterized in
that the corner of the bottom surface is chamfered.
[0009]
In order to solve the above problems, in the speaker (SP) according to claim 3, the diaphragm
(10) on the outer peripheral side and the diaphragm (11) on the inner peripheral side are
integrally formed, and the diaphragm on the outer peripheral side ( 10) A groove (13) provided
at the boundary (12) between the inner peripheral diaphragm (11) and the coil bobbin (5) fixed
in a state where one end is in the groove (13) The cross-sectional shape in the radial direction of
the groove portion (13) is characterized in that the opening side is wide and narrow in the
bottom direction.
[0010]
In order to solve the above problems, in the speaker (SP) according to claim 4, the diaphragm
(10) on the outer peripheral side and the diaphragm (11) on the inner peripheral side are
integrally formed, and the diaphragm on the outer peripheral side ( 10) A groove (13) provided
at the boundary (12) between the inner peripheral diaphragm (11) and the coil bobbin (5) fixed
in a state where one end is in the groove (13) The radial cross section of the speaker (SP) in the
groove (13) is characterized in that the corner of the bottom is chamfered.
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[0011]
In order to solve the above problems, the loudspeaker (SP1) according to claim 5 comprises a
diaphragm (6), a suspension (14) connected to the outer peripheral edge of the diaphragm (6),
and a diaphragm (6). A groove (13) having a groove (13) provided at the connection point (12)
between the outer peripheral edge and the suspension (14), and a coil bobbin (5) fixed in a state
where one end is in the groove (13) The cross-sectional shape in the radial direction of 13) is
characterized in that the opening side is wide and narrow toward the bottom.
[0012]
In order to solve the above problems, the loudspeaker (SP1) according to claim 6 comprises a
diaphragm (6), a suspension (14) connected to the outer peripheral edge of the diaphragm (6),
and a diaphragm (6) A groove (13) having a groove (13) provided at the connection point (12)
between the outer peripheral edge and the suspension (14), and a coil bobbin (5) fixed in a state
where one end is in the groove (13) The radial cross section of the speaker (SP1) in 13) is
characterized in that the corner portion of the bottom surface is chamfered.
[0013]
In order to solve the above problems, in the loudspeaker (SP1) according to claim 7, the
diaphragm (6) and the suspension (14) disposed on the outer peripheral edge of the diaphragm
(6) are integrally formed and vibrated. A groove (13) provided at the boundary (12) between the
outer peripheral edge of the plate (6) and the suspension (14), and a coil bobbin (5) fixed in a
state where one end is in the groove (13) The cross-sectional shape in the radial direction of the
groove portion (13) is characterized in that the opening side is wide and narrow in the bottom
direction.
[0014]
In order to solve the above problems, in the speaker (SP1) according to claim 8, the diaphragm
(6) and the suspension (14) disposed on the outer peripheral edge of the diaphragm (6) are
integrally formed, and the vibration is generated. A groove (13) provided at the boundary (12)
between the outer peripheral edge of the plate (6) and the suspension (14), and a coil bobbin (5)
fixed in a state where one end is in the groove (13) The cross section of the groove (13) in the
radial direction of the speaker (SP1) is characterized in that the corner of the bottom surface is
chamfered.
[0015]
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An embodiment of a speaker according to the present application will be described with
reference to the drawings.
FIG. 1 is a cross-sectional view of a speaker SP according to an embodiment of the present
application.
[0016]
The speaker SP shown in FIG. 1 includes a magnet 1, a yoke 2 attached to the bottom of the
magnet 1, a center plate 3 attached to the upper surface of the magnet 1, a coil bobbin 5 with a
voice coil 4 attached, and a diaphragm 6 And.
[0017]
Here, the magnet 1 is made of, for example, a magnet having a high magnetic flux density such
as a neodymium magnet, and has a disk shape.
[0018]
The yoke 2 is composed of a bottom plate 7, a side wall 8 and an annular plate 9.
The bottom plate 7, the side wall 8 and the annular plate 9 are all made of a magnetic material
such as iron or an alloy thereof, for example, and constitute a magnetic circuit by the magnet 1,
the bottom plate 7, the side wall 8 and the annular plate 9. There is.
A magnetic gap is formed between the inner peripheral surface of the annular plate 9 and the
outer peripheral surface of the center plate 3.
[0019]
The center plate 3 is made of, for example, a magnetic material such as iron or its alloy, has a
disk shape, and is attached to the magnet 1.
[0020]
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5
The diaphragm 6 is configured such that the diaphragm 10 on the outer peripheral side, the
diaphragm 11 on the inner peripheral side, and the connecting portion 12 are integrated.
For example, a thin plate of an alloy of aluminum, titanium, beryllium or the like is formed by
pressing.
The connecting portion 12 has a groove 13.
One end of the coil bobbin 5 is fixed to the connecting portion 12 with an adhesive.
[0021]
The coil bobbin 5 is made of, for example, kraft paper, heat resistant plastic or the like, one end
thereof is fixed to the groove portion 13 of the diaphragm 6, and the voice coil 4 is wound
around the other end.
The coil bobbin 5 arranges the voice coil 4 at a predetermined position in the magnetic gap.
Also, the vibration of the voice coil 4 is transmitted to the diaphragm 6.
[0022]
The voice coil 4 is made of, for example, a copper wire, and is wound around the coil bobbin 5.
[0023]
The diaphragm 6 is fixed to the frame 15 via the edge 14.
Furthermore, a gasket 16 is provided at the mounting portion of the speaker SP, which is the
periphery of the speaker SP.
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The edge 14 returns the diaphragm 6 to a predetermined position.
[0024]
In the speaker having the above configuration, the features of the present application will be
described below.
[0025]
FIG. 2 is an enlarged cross-sectional view of the vicinity of the groove 13 which is a feature of the
speaker of the present invention.
[0026]
The diaphragm 6 has a groove 13 for fixing the coil bobbin 5.
More specifically, the groove portion 13 is provided in the connecting portion 12 between the
diaphragm 10 on the outer peripheral side and the diaphragm 11 on the inner peripheral side.
In order to adhere the coil bobbin 5 to the diaphragm 6 using the adhesive 17, the diaphragm 6
is provided with a groove 13 having an opening on the surface opposite to the vibration surface.
The coil bobbin 5 is fixed to the diaphragm 6 by filling the gap with the adhesive 17 in a state
where the coil bobbin 5 is in the groove portion 13.
Thus, the coil bobbin 5 and the diaphragm 6 can vibrate integrally. The presence of the groove
portion 13 causes the adhesive 17 to be in more contact with the surface of the coil bobbin 5 and
the inner wall surface 18 of the groove portion 13.
[0027]
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In the present embodiment, in the cross section in the radial direction of the groove 13, the
opening side on the magnetic gap side is wide and narrows toward the vibrating surface side
(bottom direction), and the bottom of the groove 13 is curved. Since the diaphragm 6 is formed
by press processing, the wall surface 18 constituting the groove portion 13 has a slope opened to
the opening side so as to facilitate mold release.
[0028]
Here, for example, the speaker SP in the present embodiment is the speaker according to the
present invention, the diaphragm 10 on the outer peripheral side is the diaphragm on the outer
peripheral side according to the present invention, and the diaphragm 11 on the inner peripheral
side is the inner peripheral side according to the present invention The connecting portion 12
forms a connecting portion according to the present invention, the coil bobbin 5 forms a coil
bobbin according to the present invention, and the groove portion 13 forms a groove portion
according to the present application.
[0029]
When the speaker SP having the above configuration receives an audio signal, current flows in
the voice coil 4 disposed in the magnetic gap.
At this time, the voice coil 4 receives force from the magnetic field and vibrates due to the
magnetic flux in the magnetic gap and the current flowing through the voice coil 4. The vibration
is transmitted to the coil bobbin 5 and is transmitted to the diaphragm 6 to vibrate the
diaphragm 6 so as to emit a sound.
[0030]
The above embodiment has the following effects. By providing the groove portion 13 in the
diaphragm 6, a large area in which the adhesive 17 contacts the surface of the coil bobbin 5 and
the inner wall surface 18 of the groove portion 13 can be secured. The cross section of the
groove 13 is open at the opening side and narrowed in the bottom direction. Therefore, when
forming the diaphragm 6 by press working, mold separation is good and damage to the mold is
small. Since the groove 13 is open on the open side, no air is left in the groove 13 when the
adhesive 17 is injected, and the adhesiveness is good. The cross section of the groove 13 is open
at the opening side and narrowed in the bottom direction. Therefore, the area of the adhesive
12-05-2019
8
attached to the coil bobbin 5 can be the same but the amount of the adhesive can be reduced, the
adhesive can be dried quickly, the manufacturing efficiency can be improved, and the
manufacturing cost can be reduced. Since the weight of the diaphragm can be reduced, the
reproduction of the sound with respect to the input audio signal is faithful. In the cross section of
the groove 13, the bottom corner has a curved shape. Therefore, the area of the adhesive
attached to the coil bobbin 5 can be the same but the amount of the adhesive can be reduced, the
adhesive can be dried quickly, the manufacturing efficiency can be improved, and the
manufacturing cost can be reduced. Since the weight of the diaphragm can be reduced, the
reproduction of the sound with respect to the input audio signal is faithful.
[0031]
The embodiment of the present application is not limited to the above, and may be modified as
follows, for example. ○ Various modifications of the cross-sectional shape of the groove can be
considered. For example, the edge may be raised on the opening side (FIG. 3 (a)). The back part
may be sharpened (FIG. 3 (b)). The cross section may have an oval shape (FIG. 3 (c)). The
inclination of the inner wall may be changed between the inner wall and the outer wall. The
bottom corner of the groove portion 13 may be cut in an arc shape and R-chamfered or Cchamfered (FIGS. 3 (d) and 3 (e)). Furthermore, the coil bobbin 5 may be bonded in a state of
being in contact with the bottom surface of the groove (not shown). The present invention can
also be applied to a speaker SP1 such as a dome-shaped speaker in which one end of the coil
bobbin 5 is fixed to the edge 14 fixed to the outer peripheral edge of the diaphragm 6. The crosssectional shape of the groove portion 13 provided in the edge 14 may be made wider toward the
bottom surface on the opening side (FIG. 4). Here, for example, the edge 14 in the present
modification forms a suspension according to the present application. As shown in FIG. 5, the
present invention is also applicable to a ring type speaker SP2 in which a hole is opened at the
center of the diaphragm 11 on the inner peripheral side. The diaphragm 11 on the inner
peripheral side may be attached to the center piece 20 via the edge 19 on the inner peripheral
side. If the shape of the center piece 20 is devised to function as an equalizer, it becomes a horn
type speaker (not shown).
[0032]
FIG. 1 is a cross-sectional view of a speaker SP according to an embodiment of the present
application. FIG. 2 is a cross-sectional view showing the groove portion 13 of the speaker SP
shown in FIG. 1 extracted and enlarged. FIG. 3 is a view showing a modification of the groove
portion 13 of the speaker SP according to the embodiment of the present application. FIG. 4 is a
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view showing a modification SP1 of the speaker according to the embodiment of the present
application. FIG. 5 is a view showing a modification SP2 of the speaker according to the
embodiment of the present application.
Explanation of sign
[0033]
SP, SP1 and SP2: speakers 5: coil bobbin 6: diaphragm 10: diaphragm on the outer peripheral
side 11: diaphragm on the inner peripheral side 12: connection portion 13: groove portion 14:
edge
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