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DESCRIPTION JP2007324644

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DESCRIPTION JP2007324644
The present invention relates to an improvement of a speaker widely used as a speaker for
reproducing bass, including audio equipment, and it is possible to provide a small-sized and
stable speaker having low-frequency reproduction capability. . A speaker according to the
present invention breaks the balance of a vibration system by arranging a vibration system
weight adjustment weight 6 substantially at the center of the inside of a voice coil 4 supported by
a diaphragm 3 and a damper 5. It is possible to provide a speaker capable of realizing stable lowfrequency reproduction without the need for [Selected figure] Figure 1
スピーカ
[0001]
The present invention relates to a speaker used for various audio devices.
[0002]
In recent years, there has been an increase in systems that make the interior of the vehicle a
comfortable space by controlling engine noise, road noise, etc. outside the vehicle, such as ANC
(Active Noise Control) in vehicle interior sound.
To briefly explain ANC, it is a system that generates noise with an opposite phase of engine noise
and road noise with a speaker to cancel noise. A speaker that can stably reproduce low
frequency, which is the main frequency band of noise, is desired by ANC developers and
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manufacturers. Moreover, there is a demand for small, lightweight, low-range reproducible
contradictory performance. The specific size is requested by the development maker with a
diameter of 60 mm and a total height of 35 mm or less. The conventional speaker used for such
an application is demonstrated with the side sectional view of the speaker of FIG.
[0003]
As shown in the figure, reference numeral 11 includes a lower plate 11a having a center pole, a
ring magnet 11b adhesively bonded to the lower plate 11a, and an upper plate 11c adhesively
bonded on the ring magnet 11b. A magnetic circuit is a magnetic circuit, and a magnetic gap 11d
is formed between the center pole of the lower plate 11a and the inner peripheral surface of the
upper plate 11c.
[0004]
The reference numeral 12 denotes a frame adhesively bonded to the upper plate 11c, the outer
periphery 13 is adhesively bonded to the frame 12 through an edge portion, and the inner
periphery does not contact the magnetic circuit 11 in the magnetic gap 11d at the lower end
side. The diaphragm is adhesively bonded to the voice coil 14 disposed as described above.
[0005]
Further, 15 is a damper whose inner periphery is adhesively bonded to the voice coil 14 and
whose outer periphery is adhesively bonded to the bottom surface of the frame 12.
[0006]
16 is a weight adjusting weight attached to the upper end of the voice coil 14. By attaching the
weight adjusting weight 16 to the voice coil 14 which is a vibrating system, the vibrating system
is made heavier to perform low-range reproduction. It is.
[0007]
In addition, although there are some that make the diaphragm 13 a special shape using two
diaphragms to increase the weight of the diaphragm itself, it has a problem that the cost is high
because the shape of the diaphragm is special.
[0008]
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For example, Patent Document 1 is known as prior art document information on a speaker using
the weight adjustment weight 16.
Japanese Utility Model Publication No. 6-49038
[0009]
However, since the conventional speaker described above only mounts the weight adjustment
weight 16 of a separate part, it is relatively inexpensive and widely used, but the weight
adjustment weight 16 is attached at the voice coil position. Since the upper end portion of 14 is
likely to cause rolling at the time of the amplitude of the diaphragm 13, there is a problem that it
is difficult to make adjustments for maintaining stable low range reproduction, and in the worst
case abnormal noise is generated It was possible.
[0010]
The present invention solves the above-mentioned problems, and can provide a low-frequency
reproduction speaker excellent in performance at low cost without changing the manufacturing
process.
[0011]
In order to solve the above problems, the speaker according to the present invention has a
vibration system weight adjustment weight disposed in the inner space of the voice coil, and
supports the voice coil at substantially the center in both the circumferential and vertical
directions of the vibration system. By arranging the vibration system weight adjustment weight
substantially at the center, it is possible to provide a speaker capable of suppressing the rolling of
the voice coil and achieving stable low frequency reproduction.
[0012]
In the speaker of the present invention, the weight adjustment weight is placed in the inner space
of the voice coil to place the center of gravity of the weight substantially at the center in both the
circumferential and vertical directions of the vibration system or at the center of the voice coil
support. Thus, the weight balance is improved, the rolling generated at the time of the vibration
of the diaphragm is suppressed, and stable low-range reproduction is achieved.
[0013]
Hereinafter, a speaker according to an embodiment of the present invention will be described
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with reference to FIGS.
[0014]
(First Embodiment) FIG. 1 is a side sectional view of a speaker according to an embodiment of the
present invention, FIG. 2 is a sound pressure-frequency characteristic view of the same, and FIG.
3 is a side sectional view of the speaker of the same development example. FIG. 4 is a sound
pressure-frequency characteristic diagram, and FIG. 5 is a side cross-sectional view of the
speaker of the other development example.
[0015]
According to FIG. 1, 1 comprises a lower plate 1a having a center pole, an annular magnet 1b
and an upper plate 1c superimposed thereon, and a magnetic gap is formed between the outer
periphery of the center pole and the inner periphery of the upper plate 1c. A magnetic circuit 1d
is formed, 2 is a frame adhesively bonded to the upper plate 1c, 3 is a cone-shaped diaphragm,
and an outer peripheral portion of the diaphragm 3 is bonded to the frame 2 through an edge. It
is combined.
[0016]
Reference numeral 5 denotes a damper, and an outer peripheral portion of the damper 5 is
adhesively bonded to the frame 2.
[0017]
The inner peripheral portion of the diaphragm 3 and the inner peripheral portion of the damper
5 are respectively adhesively coupled to the voice coil 4 fitted in the magnetic gap 1 d, and the
voice coil 4 is supported by the diaphragm 3 and the damper 5 It is done.
[0018]
Reference numeral 6 denotes a vibration system weight adjustment weight, which is disposed on
the inner peripheral side of the voice coil 4 as an outer diameter which is substantially the same
as or slightly smaller than the inner peripheral diameter of the voice coil 4.
[0019]
The weight balance of the vibration system weight adjustment weight 6 and the voice coil 4
supported at two places between the diaphragm 3 and the damper 5 is the weight balance of the
vibration system weight adjustment weight at the center of the support portion. It is preferable to
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position the center of 6 in both the circumferential direction and the vertical direction.
[0020]
However, only in the vertical direction, it was confirmed that if it is about ± 20%, the balance
against the amplitude of the diaphragm is small and rolling is also suppressed and stable bass
reproduction can be performed.
[0021]
Sound pressure-frequency characteristics a are shown in FIG.
[0022]
As for the circumferential direction, since the vibration system weight adjusting weight 6 is fitted
in the voice coil 4, the error is negligible.
[0023]
In the speaker according to the present embodiment as described above, since the vibration
system weight adjustment weight 6 is disposed at the center of the support portion in the voice
coil 4, the vibration system weight adjustment weight 6 is positioned from the outside from
above as the positioning. A plurality of legs 6a extended to the bottom and an L-shaped hook 6b
for hooking on the upper end face of the voice coil are provided at the tip.
[0024]
Although the foot portion 6a has been described as having a plurality of foot portions, the foot
portion 6a may be extended upward from the outside to the entire circumference of the
vibration-system weight adjusting weight 6, which is divided into a plurality of portions. May be
[0025]
The vibration system weight adjusting weight 6 may be fixed in the voice coil 4 by adhesively
bonding the hooking portion 6 b and the upper end surface of the voice coil 4.
[0026]
Although the material of the vibration system weight adjustment weight 6 may be any material
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as long as it is a nonmagnetic material, it is possible to use as much as possible on the premise
that it is used for a small speaker It is desirable that the specific gravity is heavy and can be
made compact.
For example, if it is a metal material, copper or aluminum is desirable, but there is an aspect that
processing is expensive.
In addition, although the use of a resin material can secure the dimensions and reduce the
processing cost, there are difficulties in downsizing.
[0027]
Therefore, another conceivable method is to use a composite material of a metal material and a
resin material.
[0028]
For example, by using a moldable resin material (specific gravity about 10) in which a polyamide
resin (PA 6) is mixed with tungsten (specific gravity 19.3), the vibration system weight is small,
heavy and has good dimensional accuracy. Adjustment weight can be obtained.
Since tungsten is a very expensive material, other metals can be used to obtain the same effect.
Die cast products are also useful means.
[0029]
FIG. 3 is a side sectional view of a speaker according to a developed example of the present
embodiment, and only differences from the embodiment of FIG. 1 will be described.
The difference is in the shape of the vibration system weight adjustment weight, and in this
developed example, a dome-shaped vibration system weight adjustment weight 6c is used in
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place of the flat disk-like vibration system weight adjustment weight 6 of FIG. It is.
[0030]
In addition, although it is a shape of vibration system weight adjustment weight 6c, if it is a range
which does not lose balance in the perpendicular direction, it does not necessarily need to be
plane shape, and it is better in terms of acoustic characteristics if it is dome shape etc. Direction.
The sound pressure-frequency characteristic b is shown in FIG. 4, and it is confirmed that the
characteristic is smoother than that of FIG. 2, and distortion in the high region (first harmonic b1
and second harmonic b2) It is also confirmed that the loudspeaker of this development example
is lower than the distortion in FIG. 1 (the first harmonic a1 and the second harmonic a2).
[0031]
FIG. 5 is also a side sectional view of the speaker according to the developed example of the
present embodiment, but to explain only the difference from the present embodiment of FIG. 1,
the tip of the hook portion 6e of the vibration system weight adjustment weight 6d is , And
extends downward to the adhesive coated portions of the voice coil 4 and the diaphragm 3.
[0032]
With such a configuration, the process of assembling the speaker can be simplified by
simultaneously bonding the three points of the voice coil 4, the diaphragm 3 and the vibration
system weight adjustment weight 6d.
[0033]
It is also possible to simultaneously bond four points of the voice coil 4, the diaphragm 3, the
vibration system weight adjustment weight 6d, and the damper 5.
This further simplifies the process of assembling the speaker.
[0034]
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In the above description, the outer diameters of the vibration system weight adjustment weights
6, 6c and 6d are matched to the inner peripheral shape of the voice coil 4, assuming a cylindrical
shape the same as or slightly smaller than the inner periphery of the voice coil 4. As described
above, the cross section in the circumferential direction may have an elliptical shape, a
substantially pentagonal shape, or the like, as long as the position of the center of gravity of the
vibration system weight adjustment weight can be held and fixed.
[0035]
In the speaker according to the present invention, the vibration system weight adjustment weight
is disposed in the inner space of the voice coil of the speaker, and the center of gravity of the
weight is substantially at the center in both the circumferential and vertical directions of the
vibration system The weight balance becomes good and rolling that occurs at the time of the
amplitude of the diaphragm can be suppressed, and stable low-frequency reproduction can be
achieved. Control) is useful for use as a speaker.
[0036]
Side sectional view of the speaker in one embodiment of the present invention Sound pressurefrequency characteristic view Side sectional view of the speaker of the same development
example Sound pressure-frequency characteristic view of the speaker of the other development
example Side sectional view of the conventional speaker Cross section
Explanation of sign
[0037]
1 magnetic circuit 1a lower plate 1b annular magnet 1c upper plate 1d magnetic gap 2 frame 3
diaphragm 4 voice coil 5 damper 6, 6c, 6d vibration system weight adjustment weight 6a foot 6b,
6e hook
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