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DESCRIPTION JP2006025350

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DESCRIPTION JP2006025350
PROBLEM TO BE SOLVED: To reduce reproduction distortion without increasing the aperture
diameter of a super low frequency or low frequency sound reproduction speaker, and to enable
high volume output of low frequency range. SOLUTION: The speaker device is equipped with the
speaker unit 1, and causes the diaphragm 1A of the speaker unit 1 to face the opening 2A of the
baffle plate 2 so as to face the radiation surface of the diaphragm 1A. The pressure resistance
plate (compression board) 3 is disposed with a predetermined space S at a predetermined
interval. [Selected figure] Figure 1
Speaker device
[0001]
The present invention relates to a speaker device.
[0002]
In order to obtain a sense of weight and presence in the reproduced sound, it is essential to have
a high sound quality ultra bass or a speaker for reproducing the bass (subwoofer or woofer).
However, it can be said that the difficulty of reproducing ultra bass or bass is to prevent the
occurrence of harmonic distortion in ultra bass or bass rather than lowering the bass playback
frequency. In the speaker device, since the amplitude increases in inverse proportion to the
square of the reproduction frequency, the linearity of the driving force related to the magnetic
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flux distribution of the voice coil and the magnetic circuit, and the mechanical linearity of the
vibration portion support system due to the amplitude. Is very difficult in ultra low tone or low
tone reproduction.
[0003]
On the other hand, it is generally known that the amplitude at the time of low-pass reproduction
becomes a significantly large amplitude value as the aperture of the speaker becomes smaller
(see Non-Patent Document 1 below). Therefore, the speaker for ultra bass or bass reproduction in
the related art suppresses the amplitude and enables high quality reproduction by adopting a
diaphragm with a large diameter.
[0004]
Further, according to the diaphragm having a large diameter, a material having high rigidity is
required in order to reproduce piston vibration with a large amplitude and a small distortion with
a large air added weight. For this reason, the diaphragm material is restricted, and a thick, lowdensity, light base material is used, and a composite diaphragm in which a honeycomb sandwich
cone or a foam resin is sandwiched is used instead of a paper cone. There are many things.
[0005]
伯 Osamu Saeki "new edition Speaker & enclosure encyclopedia" Seibundo Shinkosha publication,
April 10, 2001, p.42
[0006]
However, when installing a speaker device for ultra low tone or low tone reproduction, there are
cases where the aperture of the diaphragm can not be enlarged due to the relationship of the
installation space.
In addition, when it is desired to obtain the largest possible sound volume in a fixed space, a
speaker unit with a relatively small diameter is determined within the fixed space rather than
adopting a speaker unit using a large diameter diaphragm. It is possible to efficiently arrange the
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sound source in the space and to output a large sound volume if densely arranged in the space,
but in the case of performing super bass or bass tone reproduction using such a small aperture
speaker unit, As described above, the amplitude is increased, which causes a problem that
harmonic distortion can not be effectively prevented.
[0007]
Further, as described above, when high-quality low-pass reproduction is performed using a largediameter diaphragm, there is a restriction on the diaphragm material, and there is also a problem
that the cost of the speaker unit increases.
[0008]
The present invention has been proposed to address such a problem, and it is intended to reduce
reproduction distortion without increasing the aperture of the super bass or bass loudspeaker,
and also to achieve super bass or bass. Even when the bass reproduction speaker is closely
arranged in a predetermined space to obtain a large volume, it is possible to effectively obtain
high-quality sound with little distortion, and the diaphragm material of the super bass or the bass
reproduction speaker It is an object of the present invention to, for example, eliminate the
limitation and reduce the cost of the speaker unit.
[0009]
In order to achieve such an object, the speaker device according to the present invention at least
comprises the configurations according to the respective independent claims below.
[0010]
In the speaker device equipped with the speaker unit by making the diaphragm of the speaker
unit face the opening of the baffle plate, the radiation surface of the diaphragm is faced, and a
predetermined space is provided between the baffle plate A speaker device characterized in that
a pressure board is disposed.
[0011]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
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FIG. 1 is an explanatory view for explaining a speaker device according to an embodiment of the
present invention.
The speaker device according to the embodiment of the present invention is equipped with the
speaker unit 1, and causes the diaphragm 1A of the speaker unit 1 to face the opening 2A of the
baffle plate 2 to face the radiation surface of the diaphragm 1A. A pressure-resistant plate
(compression board) 3 is disposed with a predetermined space S between them and 2.
The pressure plate 3 mentioned here may be a plate-like member having desired strength and
counter pressure characteristics, and can be made of a wooden plate or the like.
[0012]
More specifically, the pressure bearing plate 3 is fixed to the baffle plate 2 by the fastening
members 4A and 4B, and the spacer member 5 is interposed between the baffle plate 2 and the
pressure bearing plate 3 to maintain the spacing S. .
Further, by equalizing the width of the spacer member 5, the baffle plate 2 and the pressure plate
3 are arranged in parallel.
[0013]
Such a speaker device can obtain an advantageous advantage by using the speaker unit 1 for
non-directional ultra-low or low-frequency reproduction (subwoofer or woofer).
[0014]
That is, since the air pressure radiated from the radiation surface of the diaphragm 1A at the
time of ultra low tone or low tone reproduction is blocked by the pressure plate 3 disposed
facing the radiation surface, the air load on the front surface of the diaphragm 1A is To rise.
For this reason, a load in the direction opposite to the amplitude direction is applied at the time
of ultra bass or bass tone reproduction, and the amplitude of the diaphragm 1A (or voice coil) is
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suppressed. By this, the amplitude of the diaphragm 1A can be suppressed within an appropriate
range without increasing the diaphragm aperture, and generation of distortion can be effectively
prevented, and high-quality reproduced sound can be output. That is, the input resistance is
improved by suppressing the amplitude of the diaphragm 1A, and the voice coil may be out of
the appropriate range (linear range of the driving force) of the magnetic circuit even for the
output of a large volume. It is possible to perform low-pass reproduction with proper sound
quality. It is also possible to prevent the generation of noise and mechanical damage caused by
the voice coil being out of the proper range of the magnetic circuit at the time of high volume
output.
[0015]
Furthermore, by providing the pressure plate 3 on the front surface of the baffle plate 2, the air
volume on the front surface of the diaphragm 1A becomes small, and the air on the front surface
of the diaphragm 1A becomes equivalently high density at the time of ultra bass or bass
reproduction The coupling impedance of the diaphragm 1A and air is increased, and the
conversion efficiency to the sound pressure is increased. As a result, the sound pressure level can
be increased even with a small amplitude, and a large sound can be output.
[0016]
And in order to acquire such an effect, it is preferable that the space S between the baffle plate 2
and the pressure bearing plate 3 is in a sufficiently narrow range as compared with the
wavelength of the reproduction band of the speaker unit 1. For example, for a reproduction
frequency of 58 Hz (wavelength λ = 6 m), the interval S is set to about 75 mm. As a result, the
above-described increase in air load can be obtained remarkably, and the amplitude can be
effectively suppressed, and a high sound pressure level can be obtained by the increase in air
density in the interval S.
[0017]
Furthermore, when using such a speaker device to output a larger volume in a determined space,
the aperture of the speaker unit 1 is reduced to a certain extent, and as shown in FIG. , And a
plurality of speaker units 1 are densely arranged. Assuming that a circular speaker is used, the
speaker unit can be densely disposed in the determined space with the smaller diameter speaker
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unit than the large diameter speaker unit, so the occupied area of the sound source in the space
can be reduced. It can be enlarged and is effective for high volume output.
[0018]
Also in this case, by providing the pressure plate 3 on the front surface so as to cover the whole
of the diaphragm 1A, the amplitude of the diaphragm 1 can be suppressed even with a small
diameter speaker unit 1, and the super bass or bass Can be performed without distortion.
Further, as described above, since the conversion efficiency to the sound pressure is increased by
the increase in the coupling impedance of the diaphragm 1A and air, the sound pressure level
can be increased even with a small amplitude, and the reproduction characteristics in the low
range can be improved. As well as being able to, it is possible to output the low range at high
volume.
[0019]
Furthermore, in the case where a plurality of speaker units 1 are disposed without providing the
pressure resisting plate 3, sound pressure loss occurs due to the phase shift of the radiated
sound because the distance from each speaker unit 1 to the listening position is different. By
providing the pressure resisting plate 3 so as to cover all the speaker units 1, the radiation sound
is once mixed between the baffle plate 2 and the pressure resisting plate 3, whereby the phase
alignment is performed and the sound pressure loss is The effect of reducing is obtained.
[0020]
FIG. 3 is an explanatory view showing an installation example of the speaker device according to
the embodiment of the present invention (FIG. 3A is a perspective view showing an in-vehicle
space M, and FIG. 2B is a plan view).
Here, an on-vehicle speaker device is shown in which the above-described speaker device is
installed in a vehicle such as a truck using the in-vehicle space M. In the figure, the pressure
bearing plate 3 and the baffle plate 2 of the speaker device are installed behind the front
passenger seat or the driver's seat, and a duct plate from one end of the baffle plate 2 to the rear
space M1 side such as a loading platform in the vehicle interior space M 6 is attached. Here, the
rear space M1 is used as a speaker cabinet, and a side opening area P (see FIG. 3) adjacent to the
speaker device (speaker unit 1, baffle plate 2, pressure plate 3) including the duct plate 6 )
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Functions as a port, and according to this embodiment, constitutes a Baffleff-type speaker device
provided with a port by the opening area P. Note that, instead of separately providing the
pressure resisting plate 3, the pressure resisting plate 3 can also be configured using a part of invehicle equipment such as the back of the seat. According to such an embodiment, high quality
super bass or bass can be reproduced at a high volume in the vehicle cabin.
[0021]
Further, in this embodiment, by making the size of the pressure plate 3 smaller than that of the
baffle plate 2, it is possible to emit a sound so as to wrap the pressure plate 3 from the four
directions, upper, lower, left and right. Alternatively, by making the size of the pressure plate 3
the same as or larger than that of the baffle plate 2, the side space on the driver's seat side or the
passenger's seat side can be set as the reproduction sound radiation area.
[0022]
As described above, according to the speaker device according to the embodiment of the present
invention, it is possible to reduce, in part, the reproduction distortion without increasing the
diameter of the super bass or bass speaker. In addition, even when the super low frequency or
low frequency sound reproduction speaker unit is densely disposed in a predetermined space to
obtain a large volume, it is possible to effectively obtain high-quality sound with less distortion.
Furthermore, since the diaphragm 1A is not made to have a large diameter, it is possible to
reduce the cost of the speaker unit 1 without the limitation of the diaphragm material. Further,
by providing the pressure plate 3 on the front surface of the baffle plate 2, the air on the front
surface of the diaphragm 1A becomes equivalently high density at the time of ultra bass or bass
reproduction, and the coupling impedance of the diaphragm 1A and air increases. Since the
conversion efficiency to the sound pressure is increased, the sound pressure level can be
increased even with a small amplitude, and a large sound can be output.
[0023]
It is an explanatory view of a speaker device concerning an embodiment of the present invention.
It is an explanatory view of a speaker device concerning an embodiment of the present invention
(a state where a plurality of speaker units 1 are closely arranged to a baffle plate 2 is shown). It is
an explanatory view showing an example of installation of a speaker apparatus concerning an
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embodiment of the present invention.
Explanation of sign
[0024]
Reference Signs List 1 speaker unit 1A diaphragm 2 baffle plate 2A opening 3 pressure plate
(compression board) 6 duct plate S space M space inside car M1 rear space P opening area (port)
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