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DESCRIPTION JP2010074226

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DESCRIPTION JP2010074226
An object of the present invention is to make a speaker thinner. For this reason, the speaker
according to the present invention has a voice coil body 4 movably disposed in a magnetic gap 3
of a magnetic circuit body 2 supported by a frame 1, and an outer peripheral end portion is an
inner periphery of the frame 1. The diaphragm 6 whose end is connected to the voice coil body 4
and the magnetic circuit body 2 side from the diaphragm 6, the outer peripheral end is
connected to the frame 1 and the inner peripheral end is connected to the voice coil 4 A first
inflection point bent toward the magnetic circuit body 2 at a portion where the inner peripheral
edge portion of the suspension holder 10 is joined to the diaphragm 6 and the diaphragm 6 is
joined to the suspension holder 10 The first inflection point 8 has a second inflection point 9 that
is bent in the opposite direction to the first inflection point 8. With this configuration, the height
of the diaphragm 6 can be reduced without increasing the apex angle formed by the voice coil
body 4 and the diaphragm 6, and as a result, the thickness of the speaker can be reduced.
[Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker.
[0002]
In recent years, even if the diaphragm is vibrated largely up and down in order to increase the
output of the speaker as in the speaker described in Patent Document 1, a speaker having a
configuration that generates less distortion has been proposed.
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1
[0003]
The configuration of the speaker described in Patent Document 1 is specifically shown below.
[0004]
In the speaker described in Patent Document 1, as shown in FIG. 3, the inner peripheral end of
the diaphragm 103 is connected to the voice coil body 102 disposed movably in the magnetic
circuit 101, and the outer peripheral end of the diaphragm 103 is It is connected to the frame
105 through the edge 104 of 1 and the back surface of the diaphragm 103 is connected to the
frame 105 through the suspension holder 106 and the second edge 107.
[0005]
Then, by making the projecting shapes of the first edge 104 and the second edge 107 opposite to
each other and making the vertical amplitude of the diaphragm 103 vertically symmetrical, this
occurs when the diaphragm 103 is vibrated largely vertically. The amount of distortion was
reduced.
JP, 2004-7332, A
[0006]
However, by making the apex angle A formed between the voice coil body 102 and the
diaphragm 103 larger than the speaker shown in FIG. 3 and arranging the connection position
between the edge 104 and the frame 105 downward, the speaker can be made thin. Major
problems arose.
[0007]
That is, if the apex angle A is increased to reduce the thickness, the shape rigidity of the
diaphragm 103 which receives the vibration from the voice coil body 102 is reduced. Therefore,
particularly in the loudspeaker as shown in FIG. When the plate 103 is vibrated largely up and
down, the connection portion between the diaphragm 103 and the voice coil body 102 can not
withstand the vibration load, and there is a possibility that this portion may be damaged.
[0008]
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Then, this invention solves these subjects and it aims at achieving thickness reduction of a
speaker.
[0009]
And in order to achieve this object, according to the present invention, there is provided a frame,
a magnetic circuit supported by the frame, and a voice coil disposed movably with respect to a
magnetic gap formed by the magnetic circuit. An outer peripheral end is connected to the frame,
an inner peripheral end is provided closer to the magnetic circuit body than the diaphragm
connected to the voice coil body, and an outer peripheral end is connected to the frame; A
suspension holder having a peripheral end connected to the voice coil body, an inner peripheral
peripheral edge of the suspension holder is joined to the diaphragm, and the diaphragm is joined
to the suspension holder at a portion where the magnetic circuit is connected A speaker having a
first inflection point bent toward the body side, and a second inflection point bent in a direction
opposite to the first inflection point outside the first inflection point. .
[0010]
With the above configuration, the speaker can be thinned.
[0011]
This is because the diaphragm has the first and second inflection points.
[0012]
That is, in the speaker using the present invention, the diaphragm is reduced in height by
bending the diaphragm toward the magnetic circuit body at the first inflection point, thereby
achieving thinning of the entire speaker.
Then, the diaphragm bent toward the magnetic circuit body at the second inflection point is bent
again in the sound output direction.
[0013]
Therefore, it is possible to reduce the height of the diaphragm without increasing the apex angle,
and it is possible to reduce the thickness of the speaker without causing breakage at the
connection portion between the diaphragm and the voice coil body.
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[0014]
Further, since the inner peripheral portion of the diaphragm is joined to the suspension holder,
the rigidity can be further improved.
[0015]
Embodiment 1 Hereinafter, a configuration of a speaker in the present embodiment will be
described with reference to FIG.
FIG. 1 is a cross-sectional view showing a speaker of the present invention.
[0016]
The magnetic circuit body 2 disposed at the center of the bottom of the mortar-shaped frame 1 is
formed by combining and bonding a disk-shaped magnet 2a, a disk-shaped plate 2b and a
cylindrical yoke 2c.
Further, between the inner peripheral side surface of the side wall portion of the yoke 2c and the
outer peripheral side surface of the plate 2b, a magnetic gap 3 opened toward the upper surface
side of the magnetic circuit body 2 is formed.
[0017]
The voice coil body 4 is constituted by a cylindrical voice coil bobbin 4a and a coil 4b wound
around the outer peripheral surface of the voice coil bobbin 4a, and the coil 4b is movable in the
vertical direction with respect to the magnetic gap 3 described above. Is located in
Above the voice coil body 4, a hemispherical dust cap 5 is connected to the diaphragm 6 so as to
cover the upper opening of the voice coil bobbin 4 a, and dust, moisture, etc. The penetration of
the magnetic gap 3 through the opening is prevented.
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[0018]
Although not shown, the gold wire of the coil 4b is pulled out of the upper part of the voice coil
body 4 to the outside of the frame 1, and when driving the speaker, the voice coil is used via the
gold wire. Apply alternating current to body 4
[0019]
The diaphragm 6 is a portion that generates voice to the outside of the speaker by vibrating in
the vertical direction at the time of voice output, and is mainly made of pulp having both high
rigidity and internal loss.
[0020]
The inner peripheral end of the diaphragm 6 is connected to the outer peripheral surface of the
voice coil body 4, and the outer peripheral end is connected to the upper inner peripheral
surface of the frame 1 via the first edge 7.
In addition, the diaphragm 6 has a first inflection point 8 bent in an R shape on the magnetic
circuit body 2 side, that is, the lower side shown in FIG. 1 near the voice coil body 4 inside the
dust cap 5 .
The R shape is to disperse the stress applied to the first inflection point 8 at the time of the
vertical vibration of the diaphragm 6 to prevent the diaphragm 6 from being damaged.
Further, as shown in FIG. 1, in order to prevent stress load from being applied to the first
inflection point 8 excessively, it is preferable to make the bending angle of the diaphragm 6 at
the first inflection point 8 an obtuse angle.
[0021]
Furthermore, the diaphragm 6 has a second inflection point 9 on the outside of the first
inflection point 8 and on the inside of the dust cap 5.
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At the second inflection point 9, the diaphragm 6 is bent in the sound output direction, that is, in
the upper side shown in FIG.
Like the first inflection point 8, the diaphragm 6 is also bent in an R shape at the second
inflection point 9 to prevent the diaphragm 6 from being damaged.
[0022]
The suspension holder 10 is provided on the magnetic circuit body 2 side of the diaphragm 6,
that is, on the lower side of the diaphragm 6 in FIG. 1, the inner peripheral end is connected to
the outer peripheral surface of the voice coil body 4, and the outer peripheral end is second The
lower inner circumferential surface of the frame 1 is connected via the edge 11 of the frame 1.
The surface on the sound output direction side of the inner peripheral edge portion of the
suspension holder 10 is joined to the surface of the diaphragm 6 on the magnetic circuit body 2
side, and the junction is in contact with the voice coil body 4 of the diaphragm 6 It is from the
part to the position near the second inflection point 9.
However, the suspension holder 10 is not in contact with the diaphragm 6 at the position of the
second inflection point 9.
That is, the suspension holder 10 is bent at the same angle as the diaphragm 6 at the contact
portion with the first inflection point 8 of the diaphragm 6, but the diaphragm at the position of
the second inflection point 9 As shown in FIG. 6, the sound output direction side is not bent but
extends to the second edge 11 while drawing a loose curve.
[0023]
Further, as shown in FIG. 1, the shapes of the first edge 7 and the second edge 11 are
symmetrical and similar to each other.
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That is, while the first edge 7 has a semicircular cross section projecting in the sound output
direction, the second edge 11 has a semicircular cross section projecting in the direction of the
magnetic circuit body 2 in the opposite direction. It has become. The flexibility and the linearity
of the first edge 7 and the second edge 11 are substantially equal.
[0024]
Thus, by making the shapes of the first edge 7 and the second edge 11 into shapes which
respectively protrude in the opposite direction and setting the flexibility and the linearity to
substantially the same values, the first edge 7 and the second edge 7 can be obtained. The
movable load in the vertical direction received from the voice coil body 4 with the edge 11 of the
is approximated. Therefore, in the speaker according to the present embodiment, the vibration in
the vertical direction of the diaphragm 6 can be symmetrical, and as a result, even if the vibration
of the diaphragm 6 is increased to increase the output of the speaker, The sound to be
reproduced hardly contains distortion due to the asymmetry of vibration.
[0025]
The first edge 7 and the second edge 11 are formed of a material such as urethane, foam rubber,
SBR or cloth so as not to apply a movable load to the diaphragm 6 and the suspension holder 10
as much as possible.
[0026]
Next, the effect of the speaker in the present embodiment will be described.
[0027]
When thinning is achieved by increasing the apex angle A formed by the voice coil body 102 and
the diaphragm 103 as compared with the conventional speaker as shown in FIG. 3, the
connection portion between the voice coil body 102 and the diaphragm 103 is The shape rigidity
is reduced, and this portion may be damaged when the speaker is driven.
[0028]
In particular, although the speaker for reducing distortion as shown in FIG. 3 has a performance
that distortion is unlikely to occur even in the case of a large output, when thinning is attempted
by increasing the apex angle, vibration is generated. There is a problem that the performance can
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not be sufficiently exhibited because there is a fear of breakage of the connection portion
between the plate 6 and the voice coil body 4.
[0029]
On the other hand, in the speaker of the present embodiment, these problems are solved, and the
speaker can be thinned.
[0030]
This is because the speaker of the present embodiment has the first inflection point 8 and the
second inflection point 9.
[0031]
That is, in the speaker according to the present embodiment, the diaphragm 6 is bent toward the
magnetic circuit body 2 at the first inflection point 8, and the opposite direction to the first
inflection point 8 at the second inflection point 9. In the structure bent in the above, the entire
height of the diaphragm 6 can be reduced by the height H1 from the first inflection point 8 to
the second inflection point 9 without increasing the apex angle. .
As a result, it is possible to make the speaker thinner.
Here, the total height of the diaphragm 6 is the height H2 from the position of the second
inflection point 9 of the diaphragm 6 to the outer peripheral end.
When the inner peripheral end of the diaphragm 6 is located below the second inflection point 9,
the total height of the diaphragm 6 is the height from the inner peripheral end to the outer
peripheral end of the diaphragm 6. .
[0032]
Furthermore, in the speaker according to the present embodiment, the angles of the first
inflection point 8 and the second inflection point 9 and the distance from the first inflection point
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8 to the second inflection point 9 are adjusted. If the diaphragm 6 and the suspension holder 10
are formed, it is also possible to make the apex angle smaller and the thickness of the speaker
thinner than in the conventional speaker.
For example, if the angle of the first inflection point 8 of the speaker shown in FIG. 1 is made
small (near an acute angle), the apex angle formed between the diaphragm 6 and the voice coil
body 4 is made small, and further thinning is also achieved. Can.
[0033]
In this case, since the apex angle is small, the shape rigidity of the connection portion between
the diaphragm 6 and the voice coil body 4 is improved compared to the conventional speaker,
and in addition to thinning, the possibility of breakage of the connection portion is also reduced.
It is possible.
[0034]
Further, in the loudspeaker according to the present embodiment, the diaphragm 6 and the
suspension holder 10 have a double structure in which the diaphragm 6 and the suspension
holder 10 are superimposed in the vicinity of the voice coil body 4. As a result, the connection
portion between the diaphragm 6 and the voice coil body 4 Shape rigidity is enhanced.
Also, the diaphragm 6 and the suspension holder 10 overlap at the first inflection point 8, and
the rigidity of this portion is enhanced.
Therefore, the possibility of breakage of the first inflection point 8 due to stress load during
speaker reproduction is reduced.
[0035]
In the speaker according to the present embodiment, since the projecting directions of the first
edge 7 and the second edge 11 are opposite to each other, the reproduced sound is caused by
the asymmetry of the vibration even when reproduced with a large output. It has a configuration
that hardly includes distortion.
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[0036]
Here, as described above in the case of the conventional speaker designed to reduce the
thickness, there is a fear that the connection portion between the diaphragm 6 and the voice coil
body 4 may be damaged when the sound is reproduced with a large output.
[0037]
On the other hand, in the speaker according to the present embodiment, as described above,
since the shape rigidity of the connection portion between the diaphragm 6 and the voice coil
body 4 is sufficiently ensured, the connection portion is damaged even when reproduced with a
large output. There is little possibility of doing.
[0038]
Therefore, the speaker according to the present embodiment can sufficiently exhibit the
performance of the speaker configured to reduce distortion, in which the projecting directions of
the first edge 7 and the second edge 11 are reversed. .
[0039]
In addition, the woofer has a larger amplitude than the tweeter or a full-range speaker.
Therefore, the speaker of the present embodiment in which the possibility of breakage due to the
stress load due to the large amplitude is reduced can be suitably adopted as the woofer.
[0040]
Second Embodiment Hereinafter, the configuration of the speaker in the present embodiment will
be described with reference to FIG.
FIG. 2 is a cross-sectional view showing the speaker of the present invention.
[0041]
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10
The difference between the present embodiment and the first embodiment is that the thicknesses
of the diaphragm 12 and the suspension holder 13 are partially thick.
This point will be described in detail.
In the present embodiment, the same components as in the first embodiment are designated by
the same reference numerals in FIG. 2 and the description thereof is omitted.
[0042]
The diaphragm 12 of the present embodiment has the first inflection point 14 and the second
inflection point 15 as in the first embodiment as shown in FIG. At point 15, the thickness of the
diaphragm 12 is thicker than the thickness of the diaphragm 12 at the outside of the first
inflection point 14.
[0043]
This is because the diaphragm 12 is most susceptible to stress at the first inflection point 14 and
the second inflection point 15 during vibration.
Therefore, by making the second inflection point 15 thicker than the thickness of the other
portions, the possibility of breakage of the diaphragm 12 due to excessive stress load is reduced.
[0044]
In the present embodiment, although the thickness of the diaphragm 12 at the second inflection
point 15 is made thicker than the thickness of the diaphragm 12 at the outside of the second
inflection point 15 as described above. On the other hand, the thickness of the diaphragm 12 at
the first inflection point 14 is the same as the thickness of the diaphragm 12 outside the second
inflection point 15.
[0045]
This is because the diaphragm 12 is overlapped with the suspension holder 13 at the first
inflection point 14 and the strength is the same as the thickness of the diaphragm 12 outside the
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second inflection point 15. It is because it is expensive.
[0046]
Therefore, if necessary, the thickness of the first inflection point 14 is also thicker than the
thickness of the diaphragm 12 outside the second inflection point 15 as is the thickness of the
second inflection point 15 It is good also as composition.
With such a configuration, the strength of the diaphragm 12 at the first inflection point 14 can
be increased, and the possibility of breakage of the diaphragm 12 can be reduced.
[0047]
Further, in the present embodiment, the thickness of the suspension holder 13 at the contact
portion with the first inflection point 14 of the diaphragm 12 is thicker than the thickness of the
suspension holder 13 at the outside of the contact portion.
[0048]
This is because, like the diaphragm 12 described above, the thickness of the bent portion most
susceptible to stress load is made thicker than the thickness of the other portions, thereby
enhancing the strength.
Therefore, with this configuration, the possibility of breakage of the suspension holder 13 can be
reduced in the loudspeaker according to the present embodiment.
[0049]
Therefore, in the loudspeaker according to the present embodiment, the possibility of breakage
of the diaphragm 12 and the suspension holder 13 can be further reduced.
As a result, it is possible to sufficiently exhibit the performance of the speaker configured to
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reduce distortion, in which the projecting directions of the first edge 7 and the second edge 11
are reversed.
[0050]
In the present embodiment, the diaphragm 12 and the suspension holder 13 are made of pulp.
As described above, when pulp is used, it is possible to cause uneven thickness at the time of
molding, and it is possible to adopt a configuration in which the thickness is partially changed as
described above. In addition, the material of the diaphragm 12 and the suspension holder 13 is
not limited to pulp, and other materials may be used as long as they can be unevenly distributed
like a polypropylene-based resin.
[0051]
In the present invention, by providing the diaphragm with the first and second inflection points,
the speaker can be thinned without increasing the apex angle formed by the voice coil and the
diaphragm. Therefore, it can be suitably adopted as a vehicle-mounted woofer or the like for
which a reduction in thickness and an increase in output are required.
[0052]
Cross-sectional view of the loudspeaker according to the first embodiment of the present
invention Cross-sectional view of the loudspeaker according to the second embodiment of the
present invention Cross-sectional view of the conventional loudspeaker
Explanation of sign
[0053]
1 frame 2 magnetic circuit body 2a magnet 2b plate 2c yoke 3 magnetic gap 4 voice coil body 4a
voice coil bobbin 4b coil 5 dust cap 6 diaphragm 7 first edge 8 first inflection point 9 second
inflection point 10 Suspension holder 11 second edge 12 diaphragm 13 suspension holder 14
first inflection point 15 second inflection point
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