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JP2005012568

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DESCRIPTION JP2005012568
[PROBLEMS] To provide a speaker device capable of reproducing bass with a sense of speed even
in a small size. A weight (40) is mounted on the back side of a drive unit (25) of a speaker unit
(23). The weight 40 is fixed by sandwiching the arm 41 between the upper portion 31 and the
lower portion 32 of the speaker box 20. The weight 40 is made of, for example, zinc die cast and
has a mass larger than that of the front load 22. In the speaker unit 23, the drive unit 25 is
supported by a bolt 42 inserted into the center of a weight 40 supported by the speaker box 20.
The periphery of the diaphragm 24 of the speaker unit 23 is pressed around the opening 44
provided in the upper portion 31 of the speaker box 20 via the buffer material 43 such as felt or
rubber. [Selected figure] Figure 8
Speaker device
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device used particularly for the reproduction of a bass range when sound is reproduced
by an audio device. 2. Description of the Related Art Conventionally, various techniques have
been developed for reproduction of a low tone range in a speaker device (see, for example, NonPatent Document 1). In the low frequency range, in the use of the speaker unit alone, sounds in
antiphase emitted from both the front and back sides of the diaphragm mix and interfere with
each other to cancel each other and to reduce the sound pressure. Assuming that the effective
vibration radius of the speaker is a, the frequency at which the wavelength λ of the sound wave
becomes 2 × π × a is a cutoff frequency at which the frequency decreases by −3 dB, and
decreases at a rate of −6 dB / oct. Sound pressure reduction due to interference can be avoided
by enclosing the back side of the diaphragm with an enclosure. However, the air in the enclosure
acts as a spring, resonates with the mass of a vibration system such as a diaphragm, and it
becomes difficult to reproduce a frequency lower than the resonance frequency. In order to
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reproduce the bass with a constant sound pressure, it is generally advantageous for the effective
vibration radius a to be large. However, since the internal volume Vc of the enclosure is
proportional to the fourth power of the effective vibration radius a of the speaker unit under the
condition that the resonance frequency is constant, the use of the speaker unit having a large
diameter diaphragm requires a large enclosure . When using a small diameter speaker unit, the
enclosure can be miniaturized. However, in order to obtain the same sound pressure as a large
aperture speaker, the amplitude is large. When the amplitude of the diaphragm of the speaker
unit is increased, the vibration is transmitted to the other parts of the speaker unit, and the
vibration is also transmitted to the enclosure, so that the sound is easily emitted from other parts
than the diaphragm. In order to prevent the emission of sound from parts other than the
diaphragm, the present applicant has made it possible to divide the relatively small volume
speaker box used as an enclosure into the first half and the second half, and provide an opening
in the first half to compare A speaker system is disclosed in which an acoustic radiation unit of a
target small diameter speaker unit is connected via a buffer material, and the speaker unit is
supported inside the speaker box (see, for example, Patent Document 1). The speaker unit is
directly supported by a stand whose tip is inserted into the interior of the speaker box from the
connection portion between the front and rear of the speaker box, or is supported by a weight
functioning as virtual grounding, and a drive unit of the speaker unit The vibration generated in
the speaker box is difficult to be transmitted to the speaker box.
[Patent Document 1] Japanese Patent Application Laid-Open No. 2001-285974 (FIG. 1) [Nonpatent Document 1] Tamon Saiki "New Edition Speaker & Enclosure Encyclopedia" Seibundo
Shinko Co., Ltd., May 28, 1999 p. A speaker system as disclosed in Patent Document 1 aims to
reproduce at full range from the low tone range to the high tone range but uses a stand. Because
of this, it can not be made too large, and there is a limit to the reproduction of the bass range. As
for the reproduction of the bass region, even a larger-sized speaker system that has been
commercialized is not sufficient, and 3D systems and 5.1 channel systems that add a subwoofer
for bass reproduction are also used. Because these subwoofers have low directivity in bass, only
one is used in many cases. The speaker system disclosed in Patent Document 1 aims to
reproduce a small size and high sound quality. Therefore, it is not preferable to use a very large
speaker system even if subwoofers are combined. If the diameter of the diaphragm is reduced
and the mass is increased, even if it is combined with a relatively small volume speaker box, it is
possible to reproduce the bass region. However, the bass range reproduced from such a speaker
system tends to be heavy and lacks a sense of speed. An object of the present invention is to
provide a small-sized speaker device capable of reproducing bass with a sense of speed.
SUMMARY OF THE INVENTION The present invention is a speaker unit which comprises a
diaphragm and a drive unit, and reciprocates the diaphragm back and forth by a drive unit
disposed behind the diaphragm to reproduce sound. The speaker unit is disposed on the front
side of the diaphragm of the speaker unit with a gap that does not contact the diaphragm surface
at the time of maximum amplitude from the diaphragm surface, and the surface facing the
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diaphragm surface has a shape along the three-dimensional shape of the diaphragm. And a front
load having a large mass compared to the mass of air added to the diaphragm. According to the
present invention, the speaker unit includes the diaphragm and the drive unit, and the drive unit
disposed behind the diaphragm reciprocates the diaphragm back and forth to perform sound
reproduction. On the front side of the diaphragm, the front load is disposed from the diaphragm
surface with a gap that does not make contact at the maximum amplitude. In the front load, the
surface facing the diaphragm surface has a shape conforming to the three-dimensional shape of
the diaphragm, and has a large mass compared to the mass of air added to the diaphragm, so the
vibration of the diaphragm is accompanied by the vibration. The vibration transmitted to the air
from the front of the diaphragm is reflected at the surface of the front load and returned to the
diaphragm.
For the diaphragm, this corresponds to an increase in the resistance of air as a medium of sound
radiation, and equivalently, a large mass is added to cause vibration. Even if the mass of the
diaphragm itself is not increased, the mass of the vibration system is increased, and therefore, it
is possible to reproduce up to the bass range. Since there is no increase in the mass of the
diaphragm itself, it is possible to reproduce bass with a sense of speed in terms of hearing.
Furthermore, according to the present invention, the diaphragm and the drive unit are provided,
and the diaphragm is reciprocated back and forth by the drive unit disposed behind the
diaphragm to perform acoustic reproduction, and the front and back direction is the vertical
direction. And a speaker unit installed on the front side of the diaphragm of the speaker unit with
a gap from the surface of the diaphragm that does not come in contact with the diaphragm at the
maximum amplitude, and the surface facing the diaphragm surface is the diaphragm A front load
having a shape that conforms to a three-dimensional shape and having a large mass compared to
the mass of air added to the diaphragm; and a virtual grounding with respect to the loudspeaker
unit disposed behind the drive unit of the loudspeaker unit And a weight for supporting the
speaker unit via the drive unit. According to the present invention, the speaker unit includes the
diaphragm and the drive unit, and the drive unit disposed behind the diaphragm reciprocates the
diaphragm back and forth to perform sound reproduction. On the front side of the diaphragm,
the front load is disposed from the diaphragm surface with a gap that does not make contact at
the maximum amplitude. In the front load, the surface facing the diaphragm surface has a shape
conforming to the three-dimensional shape of the diaphragm, and has a large mass compared to
the mass of air added to the diaphragm, so the vibration of the diaphragm is accompanied by the
vibration. The vibration transmitted to the air from the front of the diaphragm is reflected at the
surface of the front load and returned to the diaphragm. For the diaphragm, this corresponds to
an increase in the resistance of air as a medium of sound radiation, and equivalently, a large
mass is added to cause vibration. Even if the mass of the diaphragm itself is not increased, the
mass of the vibration system is increased, and therefore, it is possible to reproduce up to the bass
range. Since there is no increase in the mass of the diaphragm itself, it is possible to reproduce
bass with a sense of speed in terms of hearing. Behind the drive unit of the speaker unit, there is
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a mass to be a virtual ground with respect to the speaker unit, and a weight for supporting the
speaker unit is disposed via the drive unit, so the diaphragm is from air Even if it receives a
reaction force, it can be absorbed by the weight, reduce the transmission of vibration to the
surroundings, and prevent the sound quality from being degraded by the vibrations of the
surroundings.
Further, in the present invention, the front load is a shape in which the surface of the speaker
unit facing the diaphragm surface has the concave and convex portions of the diaphragm
reversed, and the front load and the diaphragm have a uniform gap. It is characterized by
keeping. According to the present invention, the front load and the diaphragm have the same
shape as the surface of the speaker unit facing the diaphragm surface of the speaker unit, with
the unevenness of the diaphragm being reversed. Since the gap is maintained, even when the
diaphragm vibrates with a large amplitude at the time of high volume reproduction of the bass, it
is possible to apply a uniform acoustic load to the diaphragm as a whole. Further, in the present
invention, the front surface load is characterized in that the surface of the speaker unit facing the
diaphragm has a shape such that the gap is enlarged at a peripheral portion as compared with
the central portion. . According to the present invention, the surface on the side where the front
load faces the diaphragm surface of the speaker unit has such a shape that the gap is enlarged at
the peripheral portion compared to the central portion, so that the strength is relatively strong.
The load applied to the center of a certain diaphragm can be increased, the load applied to the
periphery of the diaphragm can be reduced, and the air layer can be easily moved in and out
between the diaphragm and the front load. In the present invention, the display apparatus
further includes a speaker box for supporting the front load and the speaker unit such that a
common axis line is in a vertical direction. According to the present invention, since the front
load and the speaker unit are supported by the speaker box so that the common axis line is in the
vertical direction, the mass of the front load and the speaker unit can be easily increased. It can
be supported. Even when a weight is added behind the speaker unit, it can be arranged along the
vertical axis and can be easily supported. Furthermore, according to the present invention, the
diaphragm and the drive unit are provided, and the diaphragm is reciprocated back and forth by
the drive unit disposed behind the diaphragm to perform acoustic reproduction, and the front
and back direction is the vertical direction. A speaker unit disposed as described above, a weight
disposed behind the drive unit of the speaker unit, having a mass serving as virtual ground with
respect to the speaker unit, and supporting the speaker unit via the drive unit; It is a speaker
apparatus characterized by including a speaker unit and a speaker box which accommodates a
weight and supports a weight. According to the present invention, the speaker unit and the
weight behind the speaker unit are supported in the speaker box such that the direction in which
the diaphragm is driven by the speaker unit is in the vertical direction. Even large speaker units
and weights can be easily supported.
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Since the directivity of the reproduced sound is lost in the low frequency range, the reproduced
sound can be heard with sufficient sound quality even when the direction of the speaker unit is
the vertical direction. Further, according to the present invention, the speaker box is disposed on
the front surface side of the diaphragm of the speaker unit with a gap that does not make contact
with the diaphragm surface at the time of maximum amplitude from the diaphragm surface. The
surface has a shape that conforms to the three-dimensional shape of the diaphragm, and
supports a front load having a large mass compared to the mass of air added to the diaphragm
such that the common axis is in the vertical direction. I assume. According to the present
invention, since the front load and the speaker unit are supported by the speaker box so that the
common axis line is in the vertical direction, the mass of the front load and the speaker unit can
be easily increased. It can be supported in a well-balanced manner. Even in the case where a
weight is added behind the speaker unit, it can be disposed along the vertical axis and can be
easily supported in a well-balanced manner. Further, in the present invention, the speaker unit is
a speaker for reproducing a low frequency range. According to the present invention, it is
possible to obtain a sound pressure and a sense of speed greater than the aperture of the speaker
unit in a low frequency range, even in a relatively small size. DESCRIPTION OF THE PREFERRED
EMBODIMENTS FIG. 1 shows a schematic configuration of main parts of a speaker device 1
according to an embodiment of the present invention. The speaker device 1 includes a front load
2 and a speaker unit 3. The speaker unit 3 includes the diaphragm 4 and the drive unit 5. The
drive unit 5 is an electrodynamic type, and has a magnetic circuit 6 including a permanent
magnet, and a voice coil 7 inserted in the magnetic gap of the magnetic circuit 6. When the voice
coil 7 is electrically driven by an acoustic signal, mechanical reciprocating vibration in the
direction of the central axis 3 a of the speaker unit 3 is generated in the voice coil 7 in the
magnetic gap and transmitted to the diaphragm 4. That is, the acoustic reproduction can be
performed by reciprocating vibration of the diaphragm 4 back and forth by the driving unit 5
disposed behind the diaphragm 4. The front load 2 is disposed on the front surface side of the
diaphragm 4 of the speaker unit 3 with a gap from the surface of the diaphragm 4 so as not to be
in contact at the maximum amplitude. The front load 2 can be supported by a spacer or the like
(not shown). In the front load 2, the surface facing the surface of the diaphragm 4 has a shape
conforming to the three-dimensional shape of the diaphragm 4, and is added to the diaphragm 4
from ambient air as acoustic impedance accompanying the vibration of the diaphragm 4. It has a
large mass, for example a few kg, in comparison to the
As the front load 2, the surface of the speaker unit 3 facing the surface of the diaphragm 4 has a
shape in which the concavities and convexities of the diaphragm 4 are reversed, and a uniform
gap is maintained between the front load 2 and the diaphragm 4. Can be The front load 2 and the
diaphragm 4 maintain a uniform gap, so that even when the diaphragm 4 vibrates with a large
amplitude, a uniform acoustic load is generally applied to the diaphragm 4 at the time of loud
volume reproduction of the bass. Can. FIG. 2 shows the effect of placing the front load 2 in front
of the diaphragm 4 of the speaker unit 3. When the driving power is constant and the frequency
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is changed, the reproduction sound pressure has almost no influence in the low range, and the
reproduction sound pressure decreases as shown by hatching in the middle and high range. That
is, it can be understood that it operates as a kind of low pass filter. In terms of hearing, it is
possible to obtain a bass or a sense of speed higher than the structure or aperture of the speaker
unit 3. In the front load 2, the surface facing the surface of the diaphragm 4 has a shape
conforming to the three-dimensional shape of the diaphragm 4 and has a large mass compared
to the mass of air added to the diaphragm 4. Therefore, it is considered that the vibration
transmitted to the air from the front surface of the diaphragm 4 with the vibration of the
diaphragm 4 is reflected by the surface of the front load 2 and returned to the diaphragm 4. For
the diaphragm 4, this corresponds to an increase in the resistance of air serving as a medium of
sound radiation, and equivalently, a large mass is added to cause vibration. Even if the mass of
the diaphragm 4 itself is not increased, the mass as a vibration system is increased, so
reproduction to the low frequency range is possible, and the mass of the diaphragm 4 itself is not
increased. Is estimated to be possible. FIG. 3 shows a schematic configuration of main parts of a
speaker device 11 according to another embodiment of the present invention. In the present
embodiment, parts corresponding to those of the embodiment of FIG. In this embodiment, the
speaker unit 3 is basically the same as the embodiment of FIG. 1, but the front load 12 is
different. The front load 12 has a shape in which the surface of the speaker unit 3 on the side
facing the diaphragm 4 is such that the gap is enlarged at the peripheral portion compared to the
central portion. That is, as compared with the shape of the front unit 2 of FIG. 1 as shown by the
broken line, as shown by the solid line, the surface of the front load 12 facing the diaphragm 4
surface of the speaker unit 3 is compared to the central portion. It becomes a shape which the
said clearance gap expands in a peripheral part. By forming the front load 12 in such a shape, the
load applied to the center of the diaphragm 4 having a relatively high strength can be increased,
and the load applied to the periphery of the diaphragm 4 can be reduced. And the front load 12
can be easily moved in and out.
Although the central axis 3a of the speaker unit 3 in the embodiment of FIG. 1 and FIG. 3 is
described in the vertical direction of the drawing, and indicates that the speaker unit 3 is used
vertically, the central axis 3a Of course, it may be used in a horizontal position where the left and
right direction is. FIG. 4 shows the overall appearance of the speaker apparatus 21 using the
vertical speaker box 20 according to yet another embodiment of the present invention, with the
front load 22 removed. The front load 22 is made of, for example, aluminum die cast and has a
mass of several kg. The speaker unit 23 is supported from the inside at the top of the speaker
box 20 so that the diaphragm 24 having a diameter of, for example, about 160 mm is on the
upper side and the drive unit 25 described later is on the lower side. The front load 22 can be
fixed to a boss 26 projecting from the top of the speaker box 20 with a bolt 27 or the like. The
height of the boss 26 is a height at which the diaphragm 24 does not contact even when the
speaker device 21 is driven at the rated maximum input. If the front load 25 is attached by
adding a spacer or the like to the boss, the gap between the diaphragm 24 and the front load 22
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can be adjusted. 5, 6 and 7 show the speaker device 21 of FIG. 4 as viewed from the front side,
the right side and the top side, respectively. The speaker device 21 incorporates a driving
amplifier, the speaker box 20 can be divided into an upper portion 31 and a lower portion 32,
and an inner portion 33 described later is accommodated inside. Upper part 31, lower part 32,
and inner part 33 can be manufactured by aluminum die casting, foaming polypropylene
molding, etc., for example. A power supply unit 34 is attached to the bottom of the speaker box
20, and an amplifier unit 35, which will be described later, is housed behind the speaker box 20.
The speaker unit 23 of FIG. 4 is mounted in the speaker box 20 in a state in which the upper
portion 31 and the lower portion 32 are divided with the posture in which the central axis 23 a is
in the vertical direction. FIG. 8 shows a side cross-sectional view of the speaker device 21 of FIG.
A weight 40 is attached to the rear side of the drive unit 25 of the speaker unit 23. In the weight
40, for example, four arms 41 are provided in a laterally extending shape, and fixed by being
held between bosses provided upright on the top and bottom surfaces of the upper portion 31
and the lower portion 32 of the speaker box 20, respectively. Ru. The weight 40 is made of, for
example, zinc die cast and has a mass larger than that of the front load 22.
In the speaker unit 23, the drive unit 25 is supported by a bolt 42 inserted into the center of a
weight 40 supported by the speaker box 20. The periphery of the diaphragm 24 of the speaker
unit 23 is pressed around the opening 44 provided in the upper portion 31 of the speaker box
20 via the buffer material 43 such as felt or rubber. In the speaker box 20, the inner portion 33
and the amplifier unit 35 are attached after the speaker unit 23 is attached. FIG. 9 shows the
structure viewed from section line IX-IX of FIG. FIG. 10 shows the support structure for one arm
41 of the weight 40. A boss 46 erected from the bottom of the lower portion 32 of the speaker
box 20 is disposed at an X-shaped apex position. Bosses 47 erected from the top surface of the
upper portion 31 of the speaker box 20 are also disposed at corresponding positions. A
mounting portion 50 is provided at the tip of the arm 41, and a through hole 51 is formed in the
mounting portion 50. The boss 46 provided upright from the bottom of the lower portion 32 of
the speaker box 20 is hollow and can receive the bolt 52. The diameter of the threaded portion of
the bolt 52 is smaller than the inner diameter of the through hole 51, and the tip of the bolt 52 is
erected from the top surface of the upper portion 31 while the bolt 52 and the mounting portion
51 are not directly touched. The mounting portion 50 is fixed by forming the boss 47 or
screwing it into an insert female screw. Between the end faces of the bosses 46 and the bosses
47 and the surface of the mounting portion 50, a buffer material 53 made of felt, rubber or the
like is interposed. Thus, the speaker device 21 for housing the front load 22, the speaker unit 23
and the weight 40 in the speaker box 20 is configured. The speaker unit 23 includes a
diaphragm 24 and a drive unit 25. The drive unit 25 disposed behind the diaphragm 24
reciprocates the diaphragm 24 back and forth to perform acoustic reproduction, and thus the
central axis 23a, that is, the front and rear It is installed so that the direction is vertical. The front
load 22 is disposed on the front side of the diaphragm 24 of the speaker unit 23 with a gap from
the surface of the diaphragm 24 so as not to contact at the maximum amplitude, and the surface
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facing the surface of the diaphragm 24 is It has a shape along the three-dimensional shape of the
diaphragm 24 and has a large mass compared to the mass of air added to the diaphragm 24. The
weight 40 is disposed behind the drive unit 25 of the speaker unit 23, has a mass to be a virtual
ground with respect to the speaker unit 23, and supports the speaker unit 23 via the drive unit
25.
In the front load 22, the surface facing the surface of the diaphragm 24 has a shape conforming
to the three-dimensional shape of the diaphragm 24, and has a large mass compared to the mass
of air added to the diaphragm 24. As it has, the vibration transmitted to the air from the front
surface of the diaphragm 24 with the vibration of the diaphragm 24 is reflected by the surface of
the front load 22 and returned to the diaphragm 24. For the diaphragm 24, this corresponds to
an increase in the resistance of air serving as a medium of sound radiation, and equivalently, a
large mass is added to cause vibration. Even if the mass of the diaphragm 24 itself is not
increased, the mass of the vibration system is increased, so that reproduction up to the bass
range becomes possible. Since there is no increase in the mass of the diaphragm 24 itself, it is
estimated that bass reproduction with a sense of speed is possible in terms of hearing. Behind the
drive unit 25 of the speaker unit 23, there is a mass that is a virtual ground with respect to the
speaker unit 23, and a weight 40 for supporting the speaker unit 23 via the drive unit 25 is
disposed. Even if the diaphragm 24 receives a reaction force from the air, it is absorbed by the
weight 40 and transmission of vibration to the surroundings can be reduced, and the sound
quality can be prevented from being degraded by the surrounding vibrations. As shown in FIG. 8,
the speaker box 20 accommodates the tube 55 inside, communicates with the side portion 56 of
the speaker unit 23, and forms a bass reflex duct having an opening 57 at the bottom, Act as a
form of enclosure. A sound absorbing material 58 or the like may be inserted into the speaker
box. Although the front load 22 and the speaker unit 23 have the front load 22 disposed above
the speaker unit 23 with the speaker unit 23 facing upward, the speaker unit 23 is attached
downward and the front load is mounted. 22 can also be disposed below the speaker unit 23. As
described above, the speaker unit 23 and the front load 22 may be supported by the speaker box
so that the common axis line is in the vertical direction. Since the front load 22 and the speaker
unit 23 are supported by the speaker box so that the common axis line is in the vertical direction,
the front load 22 and the speaker unit 23 can be easily supported in a balanced manner even if
the mass increases. Can. Even when a weight 40 is added behind the speaker unit 23, the weight
40 can be disposed along the vertical axis, and can be easily supported in a well-balanced
manner. As described above, according to the present invention, a front load having a large mass
compared to the mass of air added to the diaphragm is disposed on the front side of the
diaphragm of the speaker unit. Therefore, the vibration transmitted to the air from the front
surface of the diaphragm with the vibration of the diaphragm is reflected by the surface of the
front load and returned to the diaphragm.
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Even with a small speaker device, it is possible to reproduce bass with a sense of speed in terms
of hearing. Further, according to the present invention, the front load is disposed on the front
side of the diaphragm of the speaker unit, and the virtual grounding weight is disposed on the
back side of the drive unit of the speaker unit. Since the front surface has a shape that conforms
to the three-dimensional shape of the diaphragm and the surface facing the diaphragm surface
has a large mass compared to the mass of air added to the diaphragm, even with a small speaker
device, It is possible to play bass with a sense of speed on hearing. Since a weight for supporting
the speaker unit is disposed behind the drive unit of the speaker unit via the drive unit, even if
the diaphragm receives a reaction force from the air, it is absorbed by the weight and is
transmitted to the surroundings. The transmission of vibrations can be reduced, and ambient
vibrations do not reduce the sound quality. Further, according to the present invention, since the
surface shape of the front load facing the diaphragm surface is a shape in which the unevenness
of the diaphragm is reversed, the diaphragm is applied with equal sound pressure, and the
auditory sense, Sound pressure and speed can be obtained more than expected by the structure
and aperture. Further, according to the present invention, the surface shape on the side facing
the diaphragm surface of the front load has a shape such that the gap with the diaphragm
surface is expanded at the peripheral portion compared to the central portion, so The air
between the diaphragm and the front load can be evacuated, and transient response can be
improved. Further, according to the present invention, the front load and the speaker unit can be
arranged vertically to be easily supported in the low frequency range even if the front load and
the mass of the speaker unit are large. Even when a weight is added behind the speaker unit, it
can be arranged along the vertical axis, and can easily support even a weight having a large mass
for the low frequency range. Further, according to the present invention, the speaker unit and the
weight behind the speaker unit are vertically disposed in the speaker box, and it is possible to
easily support even a speaker unit or weight having a large mass for bass reproduction. it can.
Since the directivity of the reproduced sound is lost in the low frequency range, the reproduced
sound can be heard with sufficient sound quality even when the direction of the speaker unit is
the vertical direction. Further, according to the present invention, the front load and the speaker
unit can be arranged vertically to be supported in a low frequency range, and even if the front
load and the mass of the speaker unit are large, they can be easily supported in a well-balanced
manner. . Further, according to the present invention, it is possible to obtain a sound pressure
and a sense of speed greater than the aperture of the speaker unit in terms of hearing in the
reproduction of the low tone range.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side cross sectional view showing a
schematic configuration of a main part of a speaker device 1 according to an embodiment of the
present invention. FIG. 2 is a graph showing a schematic output sound pressure frequency
characteristic of the speaker device 1 of FIG. 1; FIG. 3 is a side sectional view showing a
schematic configuration of a main part of a speaker device 11 according to another embodiment
of the present invention. FIG. 4 is a perspective view showing an appearance of a state in which a
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front load 22 is removed by a speaker device 21 according to still another embodiment of the
present invention. 5 is a front view of the speaker device 21 of FIG. 4; 6 is a right side view of the
speaker device 21 of FIG. 4; 7 is a plan view of the speaker device 21 of FIG. 4; 8 is a right side
sectional view of the speaker device 21 of FIG. 4; FIG. 9 is a cross-sectional view as viewed from
section line IX-IX of FIG. 8; 10 is a cross-sectional view showing the structure of the mounting
portion of the weight 40 of FIG. 8; [Description of the code] 1, 11, 21 speaker device 2, 12, 22
front load 3, 23 speaker unit 3a, 23a central axis 4, 24 diaphragm 5, 25 drive unit 20 speaker
box 26, 46, 47 boss 27, 42, 52 bolt 31 upper portion 32 lower portion 40 weight 43, 53 shock
absorber 50 mounting portion
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