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JP2009159009

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DESCRIPTION JP2009159009
An object of the present invention is to provide a speaker capable of improving acoustic
characteristics by suppressing divided vibration of a diaphragm. A speaker includes a magnetic
circuit unit, a vibrating unit, and a frame. The vibrating portion includes a vibrating plate 21
vibrated by the magnetic circuit portion, and an edge 20 having an inner edge attached to the
vibrating plate 21 and an outer edge attached to the frame. The diaphragm 21 is provided with a
plurality of ribs 22 for increasing the rigidity of the junction at the junction with the edge 20 at
intervals along the circumferential direction of the diaphragm 21, and the plurality of ribs Each
of the reference numerals 22 is formed to be inclined at a predetermined angle with respect to
the radial direction of the diaphragm 21. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to, for example, a speaker that vibrates a diaphragm by supplying
an audio current to generate a sound.
[0002]
For example, in a car as a moving body, various speakers (see, for example, Patent Document 1)
are conventionally used.
) Is mounted. The speaker disclosed in Patent Document 1 includes a bottomed cylindrical frame,
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1
a vibration unit accommodated in the frame, and a magnetic circuit unit to which the frame is
attached and which generates a driving force in the vibration unit. Have.
[0003]
The vibration unit includes a voice coil to which an audio current is supplied, a diaphragm that
vibrates by the driving force of the voice coil, and an edge that connects the frame and the
diaphragm. The driving force refers to an electromagnetic force (also referred to as Lorentz
force) generated when a voice current flows through the voice coil.
[0004]
The edge is made of a flexible material and is formed in an annular shape. The edge has an inner
edge attached to the outer edge of the diaphragm and an outer edge attached to the frame to
displaceably support the diaphragm on the frame.
[0005]
The magnetic circuit unit includes a permanent magnet, and a voice coil is disposed in the
magnetic gap.
[0006]
In the speaker having the above-described configuration, a voice current is supplied to the voice
coil, and an electromagnetic force (Lorentz force) acts on the voice coil to vibrate the diaphragm
described above, thereby generating a sound corresponding to the voice current. It is generated
in the acoustic radiation direction.
JP 2002-271887 A
[0007]
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2
In the speaker having the above-described configuration, an adhesive is applied between the
outer edge of the diaphragm and the inner edge of the edge to overlap the outer edge of the
diaphragm with the inner edge of the edge, and the diaphragm and the edge are mutually It was
fixed. In such a configuration, the rigidity of the portion where the edges are not overlapped is
lower than that where the edges of the diaphragm are overlapped, so the rigidity of the
diaphragm changes rapidly at the boundary. And since the boundary where the rigidity of this
diaphragm changes rapidly extends over the entire circumference of the diaphragm, it is easy to
produce divided vibration that moves upside down on both sides of the boundary. There is a
problem of reducing the acoustic characteristics.
[0008]
The present invention takes as an example the problem to address such problems. An object of
the present invention is, for example, to provide a speaker capable of improving acoustic
characteristics by suppressing divided vibration of a diaphragm.
[0009]
In order to solve the above problems and achieve the object, the speaker of the present invention
according to claim 1 is a vibration that is vibrated by a frame, a magnetic circuit unit supported
by the frame, and a voice coil to which an audio current is supplied. And a vibrating part having a
plate and an inner edge attached to the diaphragm and an outer edge attached to the frame, in a
speaker comprising: a junction of the diaphragm with the edge; A plurality of ribs for enhancing
rigidity are provided at intervals along the circumferential direction of the diaphragm, and the
plurality of ribs are inclined at a predetermined angle with respect to the radial direction of the
diaphragm. It is characterized by being formed.
[0010]
Hereinafter, a speaker according to an embodiment of the present invention will be described.
In the speaker according to the embodiment of the present invention, a rib for enhancing the
rigidity of the junction at the junction with the edge of the diaphragm is formed inclined at a
predetermined angle with respect to the radial direction of the diaphragm and By providing a
plurality of intervals along the circumferential direction of the diaphragm, by changing the
rigidity of the diaphragm between the portion where the rib of the diaphragm is formed and the
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portion where the rib is not formed, the diaphragm is changed. The boundary where the stiffness
of the is rapidly changing can be dispersed. Therefore, when the diaphragm vibrates, it is
possible to suppress divided vibration that occurs at the boundary where the rigidity of the
diaphragm changes rapidly, and peaks and valleys (peak dip) in the sound pressure frequency
characteristics in the whole diaphragm. Generation of an abnormal sound, which can be seen as
[0011]
In addition, at least two ribs different in at least one of length, height, and thickness among the
plurality of ribs may be provided. In this case, since the rigidity becomes uneven in the
circumferential direction, it is possible to further suppress the divided vibration which occurs at
the boundary where the rigidity of the diaphragm rapidly changes when the diaphragm is
vibrated.
[0012]
Furthermore, a plurality of ribs may be disposed at a location where the rib is joined to the edge
of the diaphragm so that a plurality of locations having lower rigidity than other portions are
formed at intervals in the circumferential direction of the diaphragm. In this case, since the
rigidity is more uneven in the circumferential direction, it is possible to further suppress the
divided vibration which occurs at the boundary where the rigidity of the diaphragm rapidly
changes when the diaphragm vibrates.
[0013]
Further, the plurality of ribs may be arranged such that a planar shape formed by connecting a
plurality of low rigidity portions is an odd number. In this case, since the rigidity becomes even
more uneven with respect to the circumferential direction, it is possible to further suppress
divisional vibration which occurs at the boundary where the rigidity of the diaphragm rapidly
changes when the diaphragm is vibrated.
[0014]
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One embodiment of the present invention will be described based on FIGS. 1 to 3. A speaker 1
according to an embodiment of the present invention is mounted on a vehicle as a mobile body
or the like to provide voice information to the occupants of the vehicle.
[0015]
As shown in FIG. 1, the speaker 1 includes a frame 4, a magnetic circuit unit 2, and a vibrating
unit 3 that is vibrated by the magnetic circuit unit 2 to generate a sound.
[0016]
The frame 4 is made of a thick sheet metal.
The frame 4 has an annular bottom portion 6, a main portion 7 which is continuous as rising
from the outer peripheral edge of the bottom portion 6 and has a truncated cone shape, and the
main portion 7 from the outer edge of the main portion 7. And an outwardly extending flange
portion 8.
[0017]
The main body portion 7 is formed in a cylindrical shape. The main body portion 7 has a flat
terminal portion 9 attached so as to project outward from the main body portion 7. The terminal
unit 9 is connected to an external device such as an amplifier. The terminal unit 9 is supplied
with audio current from an external device such as an amplifier. The flange portion 8 is formed
in an annular shape and is provided along the outer edge of the main body portion 7 over the
entire circumference of the main body portion 7.
[0018]
As shown in FIG. 1, the magnetic circuit unit 2 includes a yoke 10 made of a magnetic body (socalled paramagnetic body or ferromagnetic body), a magnet 11, and a magnetic body (so-called
paramagnetic body or ferromagnetic body) And a yoke plate 12 made of The yoke 10 is an
external magnetic type magnetic circuit integrally including an annular bottom plate 13 and a
cylindrical center pole 14 erected from the central inner edge of the bottom plate 13.
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[0019]
Although an external magnet type magnetic circuit is disclosed in this embodiment, the present
invention relates to an internal magnet type magnetic circuit or a magnetic circuit using both an
internal magnet type and an external magnet type (a magnet is disposed inside and outside a
voice coil bobbin) (Magnetic circuit) may be applied. In the present embodiment, the center pole
is formed with an opening that leads to the outside of the speaker device, but in the present
invention, the opening may not be formed.
[0020]
The magnet 11 is formed in an annular shape. The inner diameter of the magnet 11 is larger
than the outer diameter of the center pole 14. The magnet 11 is superimposed on the bottom
plate 13 through the center pole 14 inside. The magnet 11 described above may be excited by a
permanent magnet or a DC power supply.
[0021]
The yoke plate 12 is formed in an annular shape. The inner diameter of the yoke plate 12 is
larger than the outer diameter of the center pole 14. The yoke plate 12 is overlapped on the
magnet 11 in a state where the center pole 14 of the yoke 10 and the voice coil bobbin 16
described later pass through the inside. Further, the yoke plate 12 is stacked on the bottom 6 of
the frame 4 and fixed to the frame 4 by an adhesive or the like. Of course, the yoke plate 12 is
disposed coaxially with the frame 4.
[0022]
The yoke 10, the magnet 11 and the yoke plate 12 described above are arranged coaxially with
each other. Therefore, the inner peripheral surfaces of the magnet 11 and the yoke plate 12 are
spaced from the outer peripheral surface of the center pole 14 of the yoke 10.
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[0023]
With the configuration described above, the magnetic circuit unit 2 drives the diaphragm 21
between the outer peripheral surface of the center pole 14 of the yoke 10 and the inner
peripheral surface of the yoke plate 12 in cooperation with the voice coil 15 described later ( A
magnetic gap G is formed which generates a magnetic force for vibration. That is, the magnetic
circuit unit 2 vibrates the diaphragm 21 in cooperation with the voice coil 15.
[0024]
The vibrating portion 3 is housed (supported) in the main body portion 7 of the frame 4. The
vibration unit 3 includes a voice coil 15, a voice coil bobbin 16, a damper 17, a center cap 18, an
edge 20, a diaphragm 21, and the like.
[0025]
The voice coil 15 is disposed in the aforementioned magnetic gap G of the magnetic circuit unit
2. The tinsel wire 19 is connected to the voice coil 15. One end of the tinsel wire 19 is connected
to the voice coil 15 by soldering or the like on the outer peripheral surface of the voice coil
bobbin 16, and the other end is connected to the terminal portion 9 described above. A voice
current is supplied to the voice coil 15 via a tinsel wire 19 or the like.
[0026]
The voice coil bobbin 16 is formed in a cylindrical shape. The voice coil bobbin 16 is formed
such that the inner diameter is larger than the outer diameter of the center pole 14 of the yoke
10, and the outer diameter is formed smaller than the inner diameter of the yoke plate 12. The
voice coil bobbin 16 is coaxial with the yoke 10, the yoke plate 12, the voice coil 15, and the like.
[0027]
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In the voice coil bobbin 16, one end 16a in the axial direction is inserted into the magnetic gap G,
and the voice coil 15 is attached (wound) around the one end 16a. The voice coil bobbin 16 is
movably supported by the yoke 10 along an axial center P of the yoke 10 (indicated by an
alternate long and short dash line in FIG. 2). The axial center P is the axial center of the speaker 1
and constitutes the vibration direction of the diaphragm 21, that is, the vibration unit 3.
[0028]
The damper 17 is made of an insulating material, and is formed in an annular and thin plate
shape. The inner edge of the damper 17 is attached to the other end 16 b of the voice coil bobbin
16, and the outer edge is attached to the inner circumferential surface of the main body 7 of the
frame 4. The damper 17 allows the voice coil bobbin 16 or the vibration plate 21 to vibrate along
the axis P described above, and gradually damps the vibration of the voice coil bobbin 16 or the
vibration plate 21.
[0029]
The center cap 18 is made of a thin plate-like resin. The center cap 18 is formed in a circular arc
shape whose plan shape is circular and whose cross-sectional shape is convex toward the
acoustic radiation direction. The center cap 18 is attached to the diaphragm 21 and the voice coil
bobbin 16 in such a manner as to close the voice coil bobbin 16.
[0030]
The edge 20 is made of an elastic material such as rubber or resin. The edge 20 is formed in a
circular arc shape in which the planar shape is annular and the cross-sectional shape is convex
toward the acoustic radiation direction. The edge 20 is attached (joined) to the flange portion 8
of the frame 4 by an adhesive or the like. The edge 20 has an inner edge portion superimposed
on an outer surface 21 a on an acoustic radiation side of an outer edge portion of the diaphragm
21 which will be described later, and is joined to the diaphragm 21 by an adhesive or the like.
That is, the edge 20 is disposed so as to surround the diaphragm 21.
[0031]
The outer edge of the edge 21 is attached to the flange 8 of the frame 4 and the inner edge is
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attached to the outer edge of the diaphragm 21 so that the voice coil bobbin 16 or diaphragm 21
extends along the axis P described above. And vibration of the voice coil bobbin 16 or the
diaphragm 21 is gradually damped.
[0032]
The diaphragm 21 is made of a synthetic resin and, as shown in FIG. 1, is formed in an annular
shape with a frusto-conical shape (conical shape).
The diaphragm 21 is disposed coaxially with the center cap 18, that is, the yoke 10. The inner
edge portion of the diaphragm 21 is fixed to the other end portion 16 b of the voice coil bobbin
16 by an adhesive or the like.
[0033]
The diaphragm 21 has the inner edge portion of the edge 20 superimposed on the outer surface
21 a of the outer edge portion on the acoustic radiation side, and is joined to the edge 20 by an
adhesive or the like. That is, the diaphragm 21 is attached at its outer edge portion to the flange
portion 8 or the frame 4 via the edge 20. The diaphragm 21 is attached to the frame 4 so as to
be displaceable along the central axis direction of the speaker 1 by the elastic deformation of the
edge 20. Further, a rib 22 integrally formed with the diaphragm 21 is provided at a joint portion
21 c with the edge 20 of the outer edge portion of the diaphragm 21.
[0034]
The rib 22 is formed in a convex shape from the back surface 21 b (surface on the back side of
the outer surface 21 a) on the opposite side to the acoustic radiation side of the diaphragm 21.
As shown in FIG. 2, the ribs 22 linearly extend inward from the outer peripheral edge of the
diaphragm 21. The ribs 22 are trapezoidal in shape as viewed from the side. A plurality of ribs
22 are provided at intervals along the circumferential direction of the diaphragm 21. The
plurality of ribs 22 are formed to be inclined at a predetermined angle with respect to the radial
direction of the diaphragm 21. And rigidity is high in the location in which several rib 22 of the
junction location 21c with the edge 20 of the diaphragm 21 was formed.
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[0035]
Further, the plurality of ribs 22 is provided with a plurality of (three in the illustrated example)
minimum ribs 22 a formed with the smallest length among the plurality of ribs 22. The plurality
of minimum ribs 22a are spaced apart from each other along the circumferential direction of the
diaphragm 21, and the planar shape formed by connecting the plurality of minimum ribs 22a is
an odd-numbered polygon (triangle in the illustrated example) Is located in Although three
minimum ribs 22a having the smallest length are provided in the present embodiment, the
present invention is not limited to this, and it may be an odd number.
[0036]
Furthermore, the plurality of ribs 22 are formed such that the length of the other rib 22b
disposed between the plurality of minimum ribs 22a becomes gradually longer toward the center
between the plurality of minimum ribs 22a. ing.
[0037]
The diaphragm 21 having the above-described configuration is provided with a plurality (three)
of the minimum ribs 22 a having the smallest length among the plurality of ribs 22 so that the
diaphragm 20 with the edge 20 of the outer edge portion of the diaphragm 21 is provided. The
portions where the rigidity is low at the joint portion 21c are arranged such that the planar
shape formed by spacing the members in the circumferential direction of the diaphragm 21 and
connecting them becomes a triangle.
[0038]
In the speaker 1 having the above-described configuration, an audio current is supplied to the
voice coil 15, and the voice coil 15 disposed in the magnetic gap G vibrates along the axis P
described above according to the audio current.
Then, the voice coil bobbin 16 in which the voice coil 15 is wound around the outer periphery
vibrates along the axial center P together with the diaphragm 21 and the like, and the diaphragm
15 vibrates to generate a sound according to the audio current.
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As described above, the magnetic circuit unit 2 vibrates the diaphragm 21, that is, the vibrating
unit 3 to generate a sound.
[0039]
According to the present embodiment, the rib 22 for enhancing the rigidity of the junction 21c is
formed at a predetermined angle with respect to the radial direction of the diaphragm 21 at the
junction 21c with the edge 20 of the diaphragm 21. Further, by providing a plurality of spaces
along the circumferential direction of the diaphragm 21, the rigidity of the diaphragm 21 is
determined at the portion where the rib 22 of the diaphragm 21 is formed and the portion where
the rib 22 is not formed. By changing it, the boundary where the rigidity of the diaphragm 21
changes rapidly can be dispersed. Therefore, when vibration plate 21 vibrates, it is possible to
suppress divided vibration occurring at the boundary where the rigidity of the vibration plate 21
changes rapidly, and peaks and valleys sharp in the sound pressure frequency characteristics in
the vibration plate 21 as a whole ( It is possible to suppress the generation of abnormal sound,
which is seen as "peak dip".
[0040]
Further, according to the present embodiment, among the plurality of ribs 22, the plurality of
minimum ribs 22a having the smallest length are provided at intervals in the circumferential
direction of the diaphragm, and between the plurality of minimum ribs 22a. By forming the
length of the other ribs 22b arranged to be gradually longer toward the center between the
plurality of minimum ribs 22a, the rigidity is uneven in the circumferential direction of the
diaphragm 21. As a result, when the diaphragm 21 vibrates, it is possible to further suppress the
divided vibration that occurs at the boundary where the rigidity of the diaphragm 21 changes
rapidly.
[0041]
Furthermore, according to the present embodiment, by arranging the plurality of minimum ribs
22a formed to have the smallest length in the circumferential direction of the diaphragm 21, the
junction 21c with the edge 20 of the diaphragm 21 is formed. Since the rigidity becomes more
uneven with respect to the circumferential direction of the diaphragm 21 by forming the
plurality of low rigidity portions at intervals in the circumferential direction of the diaphragm 21,
the diaphragm 21 vibrates. At this time, it is possible to further suppress the divided vibration
which occurs at the boundary where the rigidity of the diaphragm 21 changes rapidly.
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[0042]
Further, according to the present embodiment, the edges of the diaphragm 21 are arranged by
arranging the plurality of minimum ribs 22a formed to have the shortest length so that the
planar shapes formed by connecting the respective ones become an odd-numbered polygon. The
rigidity becomes even more uneven in the circumferential direction of the diaphragm 21 by
making the plane shape formed by connecting the plurality of low rigidity portions of the joint
portion 21c with 20 into an odd-numbered polygon. Therefore, when the diaphragm 21 vibrates,
it is possible to further suppress the divided vibration that occurs at the boundary where the
rigidity of the diaphragm 21 changes rapidly.
[0043]
In the embodiment described above, the vibrating portion 3 has the diaphragm 21 which is
frusto-conical in appearance and formed in an annular shape.
However, in the present invention, the vibrating portion 3 may be configured such that the
vibrating plate is formed in a flat plate shape and the external appearance attached to the
vibrating plate is frusto-conical and has an annular drive cone.
In the present embodiment, the diaphragm 21 is made of synthetic resin or the like, but in the
present invention, the diaphragm 21 may be made of a known material such as paper.
[0044]
Further, in the embodiment described above, a plurality of minimum ribs 22a having the smallest
length among the plurality of ribs 22 are provided, and the other ribs 22b disposed between the
plurality of minimum ribs 22a are provided. The length is formed to be gradually longer toward
the center between the plurality of minimum ribs 22a.
However, in the present invention, the heights or thicknesses of the plurality of ribs 22 may be
formed to be different, and the lengths, heights, and thicknesses of the plurality of ribs 22 may
be formed to be different from each other. good.
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[0045]
According to the embodiment described above, the following speaker 1 can be obtained.
[0046]
(Supplementary Note) A frame 4, a magnetic circuit unit 2 supported by the frame 4, a
diaphragm 21 that vibrates by a driving force acting on a voice coil 15 to which an audio current
is supplied, and the diaphragm 21. A speaker 1 having a vibrating portion 3 provided and having
an edge 20 having an outer edge portion attached to the frame 4; a rigidity of the bonding
portion 21c at a bonding portion 21c with the edge 20 of the diaphragm 21; And a plurality of
ribs 22 are provided at intervals along the circumferential direction of the diaphragm 21. The
plurality of ribs 22 are inclined at a predetermined angle with respect to the radial direction of
the diaphragm 21. A speaker 1 characterized in that
[0047]
According to the note, the rib 22 for enhancing the rigidity of the joint 21c is formed at the joint
21c with the edge 20 of the diaphragm 21 at a predetermined angle with respect to the radial
direction of the diaphragm 21. Since a plurality of gaps are provided along the circumferential
direction of the diaphragm 21, the rigidity of the diaphragm 21 is changed between the location
where the ribs 22 of the diaphragm 21 are formed and the location where the ribs 22 are not
formed. Thus, the boundary where the rigidity of the diaphragm 21 changes rapidly can be
dispersed, and therefore, when the diaphragm 21 vibrates, divisional vibration occurring at the
boundary where the rigidity of the diaphragm 21 changes rapidly is suppressed. be able to.
Therefore, it is possible to suppress the generation of abnormal sound that is seen as sharp peaks
and valleys (referred to as peak dip) in the sound pressure frequency characteristics in the entire
diaphragm 21.
[0048]
The above-described embodiment only shows a typical form of the present invention, and the
present invention is not limited to the embodiment.
That is, various modifications can be made without departing from the scope of the present
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invention.
[0049]
It is a sectional view showing a speaker concerning one example of the present invention. It is a
perspective view which shows the diaphragm seen from the other side of the acoustic radiation
direction of the speaker shown by FIG. It is a top view of the diaphragm shown by FIG.
Explanation of sign
[0050]
Reference Signs List 1 speaker 2 magnetic circuit unit 3 vibration unit 4 frame 15 voice coil 20
edge 21 diaphragm 21 c joint portion 22 rib 22 a minimum rib 22 b other rib G magnetic gap P
axis
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