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JP2009206817

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DESCRIPTION JP2009206817
The present invention provides an acoustic device and an enclosure that realize improvement in
sound quality while reducing the size and thickness. An acoustic device 10 according to the
present invention includes a pair of speaker units 3 and a housing 1 for holding the pair of
loudspeaker units 3, wherein the pair of speaker units is provided. In the third embodiment, the
central axes of the respective speakers substantially coincide with each other, and the front sides
of the pair of diaphragms in the pair of speaker units 3 face in opposite directions so that the
respective diaphragms vibrate in opposite directions. A projecting portion 1 b having a hollow
that is continuous with the space inside the casing 1 is connected to the casing 1. [Selected
figure] Figure 1
Acoustic equipment and enclosures
[0001]
The present invention relates to acoustic devices and enclosures.
[0002]
Usually, the acoustic device emits sound by the vibration of the speaker unit.
The sound radiated from the front side (user side) of the speaker unit due to the vibration of the
speaker unit and the sound radiated from the back side have opposite phases. Therefore, when
the sound wraps around from the back side to the front side of the speaker unit, part of the
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sound radiated from the front side is canceled. For this reason, for example, by holding the
speaker unit in the speaker box (enclosure), the sound radiated from the back side of the speaker
unit is prevented from coming around to the front side.
[0003]
However, when the speaker unit is held in the enclosure, the vibration of the speaker unit is
transmitted to the enclosure to vibrate the enclosure. When the enclosure vibrates, the vibrating
part of the enclosure becomes a sound source. If a sound source other than the speaker unit is
generated, the sound image may be blurred and the sound quality may be degraded such as
stagnation. Therefore, in order to improve the sound quality of the acoustic device, it is necessary
to suppress the vibration of the enclosure.
[0004]
As a technique for suppressing the vibration of the enclosure, Patent Document 1 drives each of
a plurality of driver units (speaker units) in the same phase, and on each side of a plurality of
speaker units facing each other in a cabinet (enclosure) An attached bass reproduction speaker is
disclosed. With the above configuration, the vibration reaction force exerted on the enclosure by
the vibration system of the speaker unit cancels each other, so that the vibration of the enclosure
is greatly reduced.
[0005]
Further, according to Patent Document 2, driving units for electrically driving a pair of speaker
units face each other and drive units are arranged so as to maintain an arrangement state in
which drive axes are positioned on the same straight line. A speaker device is disclosed that
includes a mechanically coupled coupling material. In the above configuration, since the driving
parts are coupled by the coupling material, the vibrations generated in the support system or the
like of the speaker cancel each other. JP-A-8-79876 (published on March 22, 1996) JP-A-200415565 (published on January 15, 2004)
[0006]
However, although the techniques described in Patent Literatures 1 and 2 suppress or
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significantly reduce the vibration of an enclosure having a normal size, Patent Literatures 1 and
2 have a compact and thin acoustic device. There is no mention of a technique for suppressing
the vibration of the enclosure while maintaining the sound quality.
[0007]
In recent years, there has been an increasing demand for thinning and downsizing of acoustic
devices incorporated or attached to a display device such as a liquid crystal display device.
This is because, with the expansion of the market of the display device as the main body, in
particular, the increase in the screen size and the reduction in thickness of the display device are
advanced at a very high speed.
[0008]
The following two forms of attaching an audio device to a thin display device: Side speakers
attaching one speaker panel (L and R) including an enclosure holding a speaker unit on the left
and right of the display panel And one speaker panel on the lower side of the display panel, or an
under-speaker type in which the speaker panel sharing the housing with the display device is
attached. In the under-speaker type, one speaker unit is built in the left and right inside the
speaker panel, or in the left, right and center.
[0009]
As described above, the thickness of the housing of the display device is reduced (the narrow
bezel) due to the thinning of the display device. For this reason, in either case of the side speaker
type and the under speaker type, the thickness of the main body (sound device) of the speaker
panel must be reduced (narrowed). On the other hand, increasing the screen size of the display
device enhances the power and reality of the displayed image. Furthermore, with the expansion
of services of digital broadcasting or the improvement of the image quality of display devices, the
image processing capability of display devices is improved, and clear and beautiful images are
provided. In order to have great power and high presence, and to be clear and beautiful, the
sound device is also required to have a sound power that is more powerful and enhances the
realism. That is, there is an increasing demand for realization of improving the sound quality as
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well as reducing the thickness and size of the audio device.
[0010]
As a method of satisfying the improvement of the sound quality with respect to the sound device,
there is a method of separating the sound device and the display device by using the sound
device as an attached device of the display device. In this method, for example, a form is
conceivable in which an external speaker and an AV amplifier are provided on a rack base (AV
rack) dedicated to a thin display device. However, in this case, operations such as connection
between a display device and an audio device (such as an amplifier and a speaker) and power-up
of a system including the display device and the audio device are complicated. Therefore, the
operation by the user and the setup of the system become complicated. From the above, it is
preferable that the acoustic device be incorporated in the display device or integrated with the
display device, and it is necessary to realize improvement in sound quality (voice processing
ability) at the same time as thinning and downsizing of the acoustic device.
[0011]
When the sound device is incorporated in the display device or integrated with the display device
(a single speaker unit or an enclosure holding the speaker unit is attached to the inside of the
display device case), the following two methods are usually used: Configurations: (1) A relatively
narrow and small substantially rectangular speaker unit, or a configuration for directly fixing an
enclosure to a display housing; and (2) A small-diameter circular or rectangular configuration
There is a configuration in which the thin speaker box holding the speaker unit is directly fixed
to the housing of the display device.
[0012]
In the configurations of (1) and (2), the space on the back side of the speaker unit can not be
largely secured by thinning the display device.
This is because, in addition to the thinness of the housing of the display device, the configuration
required for the operation of the display device interferes with the arrangement position or
shape of the speaker unit. However, if the space that can be secured on the back side of the
speaker unit is too small, the sound quality of the bass will deteriorate in particular.
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[0013]
Furthermore, when the low frequency sound is reproduced, the vibration of the speaker unit is
easily transmitted to the enclosure or the casing of the display device. As described above, when
vibrations occur in addition to the speaker unit, the sound quality is degraded. In not only thin
display devices and display devices using a CRT, but in devices integrated with an acoustic
device, chattering of the device body and vibration of the case should be common to be solved in
order to realize improvement in sound quality. It is a problem.
[0014]
The present invention has been made in view of the above problems, and an object of the present
invention is to provide an acoustic device and an enclosure that realize improvement in sound
quality as well as downsizing and thinning.
[0015]
In order to solve the above-mentioned subject, an audio device of the present invention is an
audio device provided with a pair of speaker units and a case which holds a pair of abovementioned speaker units, and one pair of above-mentioned speaker units is The respective
central axes substantially coincide with each other, and the front sides of the pair of diaphragms
in the pair of speaker units face in opposite directions so that the respective diaphragms vibrate
in opposite directions. The housing is provided with a projection, and the internal space of the
projection is connected to the internal space of the housing.
[0016]
In a conventional acoustic device provided with a plurality of speaker units, desired acoustic
characteristics are realized in a predetermined space by arranging the plurality of speaker units
generally in point contrast, line symmetry or plane contrast.
For this reason, in the above configuration, the housing needs to have a shape for holding the
plurality of speaker units in a desired arrangement.
The shape of the housing is, for example, a solid having a plurality of flat or curved plane or
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point symmetry, line symmetry, or plane contrast, and more specifically, a regular polyhedron, a
polyhedron, a rectangular solid, a curved surface or a spherical surface in part It is threedimensional, spherical, or a combination thereof. For this reason, for example, when combining
an acoustic device with another device, or when there is a limitation in the arrangement position
of the acoustic device, a housing is desirable because it is necessary to maintain an appropriate
shape and to miniaturize and thin. In some cases, it can not be made large enough to secure the
volume of the
[0017]
On the other hand, in the above configuration, the projecting portion is not a portion essential for
holding the speaker unit but a portion for expanding the space inside the housing. That is, the
projection is not limited in shape from other configurations or the surrounding environment,
such as the portion of the housing that holds the speaker unit. Therefore, since the shape and
size of the protrusion can be changed as necessary, the volume of the protrusion can be
increased or decreased as needed. For example, when an acoustic device is combined with
another device, the shape and size of the protrusion may be changed in accordance with the
shape of the other device and the configuration of the other device. In addition, for example,
when the acoustic device is disposed in a limited space, the shape and size of the protrusion may
be changed using the vacant space. Also, for example, the size and shape of the protrusions can
be changed to emit a sound having desired acoustic characteristics from the speaker unit.
[0018]
From the above, according to the above configuration, the volume of the housing that can not be
secured only by the portion holding the speaker unit of the housing can be compensated by the
volume of the protrusion. When realizing a small and thin acoustic device, the sound quality of
the bass emitted from the speaker unit can be particularly improved by securing a sufficient
volume of the housing.
[0019]
In the above configuration, the central axes of the pair of speaker units substantially coincide
with each other, and the front sides of the pair of diaphragms in the pair of speaker units have
the respective pair of diaphragms opposite to each other in the opposite direction. In order to
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vibrate, they are arranged in opposite directions. By this, a pair of speaker units arranged in the
housing can emit sound so as to be separated in opposite directions. That is, for example, when
one speaker unit swings to the right, the other speaker unit swings to the left. Therefore, the
vibrations generated by the vibration of the pair of speaker units and transmitted to the housing
are attenuated each other. Here, if speaker units that perform the same operation are used as a
pair of speaker units, the vibrations transmitted to the housing, which are generated by the
vibrations of the pair of speaker units, cancel each other out. From the above, by the above
configuration, the vibration of the casing generated by the radiation of the sound from the
speaker unit is largely suppressed or prevented. That is, the deterioration of the sound quality of
the acoustic device due to the vibration of the casing and the adverse effect on the other device
when combined with the other device are largely suppressed or prevented.
[0020]
Furthermore, as described above, the pair of speaker units disposed in the housing emits sound
in the directions opposite to each other. Therefore, since the acoustic device emits sound forward
and backward, for example, as viewed from the user, it is reflected on the wall of the space in
which the acoustic device is disposed, and the acoustic characteristics are improved. As a result,
the user is made to feel that the position of the sound source point and the position of the
speaker unit are more in agreement, and the user is made to feel the spread of the sound field.
[0021]
In addition, as described above, an acoustic device is realized that achieves miniaturization and
thinning and does not generate vibration when combined with other devices, so the design
position is emphasized, and the arrangement position is free. It can be selected.
[0022]
If the above is put together, it is effective in the ability to provide an acoustic device which
realizes improvement in sound quality simultaneously with downsizing and thinning by the
above configuration.
[0023]
Further, in the acoustic device of the present invention, it is preferable that the protrusion
protrudes in a direction substantially perpendicular to the straight line.
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[0024]
As said structure, the shape of the whole housing | casing is a case where it has T shape, for
example.
Therefore, even when a large distance can not be provided between the pair of speaker units, a
large space inside the housing is secured in the vertical direction when viewed from the
arrangement direction of the pair of speaker units.
[0025]
Further, in the sound device of the present invention, it is preferable that the shape of the
protrusion is a column.
[0026]
In the above configuration, the housing has a columnar shape.
Columnar means, for example, an elongated cylindrical shape such as a cylinder or a polygonal
cylinder.
For this reason, it is possible to form a protrusion in a narrow and elongated space.
That is, a small space is used to secure a large space inside the housing.
[0027]
Further, in the acoustic device of the present invention, it is preferable that the casing further
includes a pair of passive radiators having vibration directions on substantially the same straight
line.
[0028]
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As the passive radiator is further provided, the sound in the low frequency range is further
enhanced.
Further, since the pair of passive radiators facing each other vibrates in the opposite direction,
the vibration of the passive radiator is attenuated or canceled to suppress or prevent the
vibration of the housing.
[0029]
In the acoustic device according to the present invention, preferably, a distance between the pair
of speaker units and a distance between the pair of passive radiators are substantially the same.
[0030]
According to the above configuration, it becomes easy to incorporate the acoustic device into
another device.
[0031]
Further, in the acoustic device of the present invention, it is preferable that a vibration direction
of the pair of passive radiators and a vibration direction of the pair of speaker units are
substantially the same.
[0032]
According to the above configuration, it becomes easy to incorporate the acoustic device into
another device.
[0033]
Further, in the sound device of the present invention, it is preferable that the protrusion has an
opening.
[0034]
In the above configuration, the inside and the outside of the housing are connected via the
opening of the projecting portion.
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For this reason, the sound from the inside of the housing in the pair of speaker units is radiated
to the outside through the opening of the protrusion and the gap between the protrusion and the
covering portion.
At this time, the opening functions as a bass reflex port.
That is, by the above configuration, the sound in the low frequency range is further enhanced.
[0035]
Further, in the acoustic device of the present invention, it is preferable to further include a
covering portion facing the opening.
[0036]
In the above configuration, the openings are covered by the covering at a distance.
Thus, the sound emitted from the opening goes around the covering and reaches the outside.
By appropriately changing the shape of the covering portion, the sound emitted from the opening
is induced to a desired position.
[0037]
In the acoustic device according to the present invention, preferably, the protrusion has an
opening, and the covering portion covers the protrusion with a gap between the covering portion
and the protrusion.
[0038]
In the above configuration, a space is provided between the protrusion including the opening and
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the covering.
That is, the inside and the outside of the housing are connected via the opening of the projecting
portion and the gap between the projecting portion and the covering portion.
For this reason, the sound radiated from the opening can be guided to the vicinity of the housing
in which the speaker unit is held.
[0039]
Further, in the audio device of the present invention, it is preferable that another speaker unit
different from the speaker unit is further provided in the inside of the projecting portion apart
from the housing.
[0040]
When the pair of speaker units move to the outside of the housing by vibration, the pressure in
the space in the sealed housing usually decreases.
For this reason, a force that is pulled back internally acts on the pair of speaker units, and the
amplitude of the pair of speaker units is reduced. The reduction of the amplitude of the speaker
unit leads to the reduction of the sound pressure from the speaker unit. Here, in the above
configuration, the speaker unit inside the protrusion vibrates in synchronization with the pair of
speaker units. For this reason, the amount of change in pressure in the housing due to the
vibration of the pair of speaker units is reduced by the vibration of the speaker unit inside the
protrusion. Therefore, the vibration of the pair of speaker units is assisted to suppress the
decrease in sound pressure.
[0041]
In order to solve the above-mentioned subject, an audio device of the present invention is an
audio device provided with a pair of speaker units and a case which holds a pair of abovementioned speaker units, and one pair of above-mentioned speaker units is The respective
central axes substantially coincide with each other, and the front sides of the pair of diaphragms
in the pair of speaker units face in opposite directions so that the respective diaphragms vibrate
in opposite directions. The shape of the housing is columnar.
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[0042]
In the above configuration, the housing has a columnar shape.
Columnar means, for example, an elongated cylindrical shape such as a cylinder or a polygonal
cylinder. For this reason, it is possible to dispose a large-capacity housing in a narrow and
elongated space with a small depth. For example, when the acoustic device is applied to a thin
display device having a large screen, it is possible to emit high-pitched bass sound from the
speaker unit, in particular. Further, by changing the length in the longitudinal direction of the
housing, the volume of the housing can be changed to a desired size in accordance with the
acoustic characteristics of the sound emitted from the speaker unit.
[0043]
In addition, since the case has a columnar shape, a plurality of speaker units can be arranged
approximately point-symmetrically, line-symmetrically, or plane-symmetrically at most positions
of the case. Therefore, the desired sound is realized in the predetermined space by the plurality
of speaker units.
[0044]
In the above configuration, the front sides of the diaphragms of the pair of speaker units are
arranged to vibrate in opposite directions on the central axis of the substantially coincident
speaker units. Therefore, as described above, the deterioration of the sound quality of the
acoustic device due to the vibration of the casing and the adverse effect on the other device when
combined with the other device are largely suppressed or prevented. Furthermore, the user is
made to feel that the position of the sound source point and the position of the speaker unit are
more in agreement, and the user is made to feel the spread of the sound field.
[0045]
In addition, as described above, since the acoustic device can be realized that achieves
miniaturization and thinning and does not generate vibration when combined with other devices,
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the layout position is set with emphasis on design and the like. It can be chosen freely.
[0046]
If the above is put together, it is effective in the ability to provide an acoustic device which
realizes improvement in sound quality simultaneously with downsizing and thinning by the
above configuration.
[0047]
In the acoustic device according to the present invention, preferably, the vibration direction of
the pair of passive radiators and the vibration direction of the pair of speaker units are at right
angles.
[0048]
It allows placement of passive radiators, even if it is difficult to place them in order to vibrate the
pair of passive radiators and the pair of loudspeaker units in the same direction.
For example, with the above configuration, as viewed from the user, the pair of speaker units can
emit sound back and forth, and the pair of passive radiators can emit sound up and down.
Also, for example, with the above configuration, a pair of speaker units can emit sound to the left
and right, and a pair of passive radiators can emit sound to the top and bottom, as viewed from
the user.
[0049]
Further, in the acoustic device of the present invention, preferably, the vibration direction in the
pair of speaker units changes.
[0050]
According to the above configuration, the radiation direction of the sound by the pair of speaker
units can be changed.
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[0051]
Further, in the sound device of the present invention, it is preferable that the projection part is
movable centering on a connection part with the housing.
[0052]
According to the above configuration, the user can change the radiation direction of the sound by
the pair of speaker units as needed.
[0053]
The display device of the present invention includes any one of the above-described acoustic
devices and a display unit in order to solve the above-mentioned problems.
[0054]
The above-described acoustic devices realize improvement in sound quality as well as downsizing
and thinning.
Therefore, it is possible to provide a display device that achieves improvement in sound quality
as well as downsizing and thinning.
[0055]
In the display device of the present invention, it is preferable that a display unit be further
provided, and a display surface of the display unit and a vibration direction of the pair of speaker
units be substantially parallel.
[0056]
According to the above configuration, the pair of the speaker units can emit sound vertically or
horizontally as viewed from the user.
[0057]
Preferably, the display device according to the present invention further comprises a display unit,
and a display surface of the display unit and a vibration direction of the pair of speaker units are
substantially perpendicular.
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[0058]
According to the above configuration, the pair of speaker units can emit sound back and forth
from the user.
[0059]
In the display device of the present invention, it is preferable that a display unit be further
provided, and the display surface of the display unit and the vibration direction of the pair of
speaker units form an acute angle.
[0060]
For example, when two acoustic devices are arranged on the left and right of the display unit of
the display device, the user can feel as natural sounds without the sounds from the two acoustic
devices being separated.
Further, for example, when two acoustic devices are disposed on the left and right of the display
unit of the display device, the difference in pressure of sound from the two acoustic devices is
small for the user regardless of the viewing position of the user.
[0061]
In order to solve the above problems, the enclosure of the present invention is an enclosure that
holds a pair of speaker units, wherein the pair of speaker units have their respective central axes
substantially coincident with each other, and a pair of speaker units. The front side of the
diaphragm in the speaker unit faces in the opposite direction so that each of the pair of
diaphragms vibrate in the opposite direction, and the enclosure is provided with a protrusion,
and the protrusion is The internal space is characterized in that it is connected to the internal
space of the enclosure.
[0062]
According to the above configuration, the volume of the enclosure, which can not be secured
only by the portion holding the speaker unit of the enclosure, can be compensated using the
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projection.
In particular, when realizing a compact acoustic device, the sound quality of the bass emitted
from the speaker unit can be improved by securing a sufficient volume of the enclosure.
[0063]
Also, the deterioration of the sound quality of the acoustic device due to the vibration of the
casing and the adverse effect on the other device when combined with the other device are
significantly suppressed or prevented.
Furthermore, the user is made to feel that the position of the sound source point and the position
of the speaker unit are more in agreement, and the user is made to feel the spread of the sound
field.
[0064]
Therefore, the effect of being able to provide an enclosure that realizes improvement in sound
quality at the same time as downsizing and thinning is achieved.
[0065]
As described above, in the acoustic device of the present invention, the projecting portion having
a hollow that is continuous with the space inside the housing is connected.
Therefore, it is possible to provide an acoustic device that realizes improvement in sound quality
as well as downsizing and thinning.
[0066]
Embodiments according to the present invention will be described with reference to FIGS. 1 to 9.
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In the following description, the same members and components are denoted by the same
reference numerals.
Their names and functions are also the same.
Therefore, detailed description about them will not be repeated.
[0067]
Embodiment 1 One embodiment of the present invention will be described below with reference
to FIGS. 1 to 5.
FIG. 1 is a perspective view showing the configuration of an acoustic device 10 according to an
embodiment of the present invention.
FIG. 2 is a perspective view showing the configuration of an acoustic device 20 which is a
modification of FIG.
FIG. 3 (a) is a perspective view showing the configuration of an acoustic device 30 which is
another modification of FIG. 1, and FIG. 3 (b) is a perspective view showing a radiating portion of
sound in the acoustic device 30 of (a). FIG.
FIG. 4 is a perspective view showing a configuration of an acoustic device 40 according to still
another modification of FIG.
FIG. 5 (a) is a plan view showing an arrangement example of the acoustic device 10 of FIG. 1 in
the liquid crystal display 9, and FIG. 5 (b) is a cross-sectional view of the liquid crystal display 9
of FIG.
[0068]
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In the present embodiment, the front side of the speaker unit means the side facing the outside
of the enclosure of the speaker unit, and the back side of the speaker unit means the side facing
the inside of the enclosure of the speaker unit Means Further, the front side of the liquid crystal
display means a side having a display unit for displaying an image, and the rear side of the liquid
crystal display means an opposite side of the front side.
[0069]
(Acoustic Device 10) As shown in FIG. 1, a liquid crystal display device (display device) 9 having a
large screen and being a thin TV is provided with a pair of acoustic devices 10 at both ends in
the lower part of the display unit. There is. The acoustic device 10 includes a pair of speaker
units 3 that vibrate in opposite directions on substantially the same straight line (the central axis
of the speaker units), and a T-shaped enclosure (casing) 1. The enclosure 1 comprises a
cylindrical speaker unit holding portion 1a for holding a pair of speaker units 3 and a cylindrical
projection 1b protruding in a direction substantially perpendicular to the straight line, the
speaker unit holding portion 1a and the projection The inside of the part 1b is connected. The
projecting portion 1 b protrudes from the speaker unit holding portion 1 a inside the both ends
of the speaker unit holding portion 1 a. That is, the protrusion 1 b is located on the back side
with respect to any one of the pair of speaker units 3. Further, the apertures of the speaker unit
holding portion 1 a and the projecting portion 1 b are substantially the same as the apertures of
the pair of speaker units 3.
[0070]
Here, the volume of the speaker unit holding portion 1 b is limited by the thickness of the liquid
crystal display device 9. Furthermore, the aperture of the speaker unit 3 and the speaker unit
holder 1b is limited by the space (in particular, in the height direction) in the lower part of the
liquid crystal display device 9. However, as described above, since the enclosure 1 has the
protrusion 1 b, the volume of the speaker unit holding portion 1 b which is subject to various
limitations can be compensated. As a result, since the small and thin acoustic device 10 disposed
in the limited space has a sufficient volume inside the enclosure 1, it is possible to output lowrange sound with excellent sound quality. The length of the protrusion 1b (left and right in the
sheet) may be changed to be longer or shorter than the length of the speaker unit holding
portion 1b (upper and lower in the sheet) as necessary. . By changing the length of the protrusion
1 b, the volume of the enclosure 1 can be changed in accordance with the acoustic
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characteristics required for the sound emitted from the pair of speaker units 3.
[0071]
Furthermore, as described above, the pair of speaker units 3 having substantially the same
aperture vibrate in opposite directions on substantially the same straight line. Therefore, even if
the pair of speaker units 3 vibrate and emit sound, the vibrations of the pair of speaker units 3
attenuate or cancel each other. That is, the vibration of the enclosure 1 due to the radiation of
the sound from the pair of speaker units 3 is suppressed or prevented. For this reason, the
problem that the vibration is transmitted to the other device, which occurs when combining the
acoustic device with the other device, is greatly reduced or eliminated. Therefore, the
deterioration of the sound quality when combined with another device in the acoustic device is
suppressed. In addition, it is possible to freely select where in the liquid crystal display device 9
the acoustic device 10 is to be disposed. Further, as described above, since the acoustic device 10
is small and thin, it is not necessary to make the other portion (here, the lower portion of the
display portion) larger than the display portion of the liquid crystal display device 9 . Therefore,
the liquid crystal display device 9 can be designed with emphasis on design.
[0072]
As described above, the pair of speaker units 3 vibrate in the opposite direction to emit sound.
Therefore, since the acoustic device 10 emits sound forward and backward as viewed from the
user, the acoustic device 10 is reflected on the wall surface of the space in which the liquid
crystal display device 9 is disposed, and the acoustic characteristics are improved. As a result, the
user is made to feel that the position of the sound source point and the position of the speaker
unit are more in agreement, and the user is made to feel the spread of the sound field.
[0073]
As described above, the protrusion 1 b is located on the back side with respect to any one of the
pair of speaker units 3. That is, since the protrusion 1 b is a cylinder having a diameter shorter
than the width of the pair of speaker units, the space around the protrusion 1 b inside the liquid
crystal display device 9 has some allowance. Therefore, the configuration necessary for the
operation of the liquid crystal display device 9 may be provided around the protrusion 1 b. If the
projecting portion 1 b is located on the back side of the pair of speaker units 3, attachment of the
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acoustic device 10 is easy even if only a narrow space can be secured as in a thin TV.
[0074]
Further, as described above, the diameters of the speaker unit holding portion 1a and the
protrusion 1b are substantially the same as the diameters of the pair of speaker units 3. Since the
acoustic device 10 having such a shape is compact and has almost no baffle surface, it is close to
a point sound source in a sound field. Thus, the sound emitted from the acoustic device 10 is
perceived by the user as a more natural sound.
[0075]
As described above, with the above-described configuration, it is possible to provide the acoustic
device 10 that achieves improvement in sound quality as well as downsizing and thinning. The
acoustic device 10 is particularly suitable for application to a large screen and thin liquid crystal
display device 9.
[0076]
Here, it is preferable that the speaker unit holding portion 1a and the protruding portion 1b be
joined so that the angle changes. For example, the speaker unit holding portion 1a and the
projecting portion 1b may be joined by a bellows-like elastic body. Thereby, the speaker unit
holding portion 1b can be rotated with respect to the projecting portion 1b. That is, the radiation
direction of the sound from the pair of speaker units 3 can be freely changed.
[0077]
Here, the shape of the speaker unit holding portion 1a and the projecting portion 1b which
constitute the enclosure 1 is cylindrical. Having a streamlined interior such as a cylindrical shape
is effective for reducing wind noise in the interior of the enclosure 1 caused by the vibration of
the speaker unit 3. However, the speaker unit holding portion 1a and the projecting portion 1b
are not limited to the cylindrical shape, but have a prismatic shape such as a triangular prism, a
square prism, a polygonal prism such as a pentagonal prism and a hexagonal prism, and an oval
04-05-2019
20
cross section. It should just be.
[0078]
(Acoustic Device 20) The acoustic device 20 is common to the acoustic device 10 in many
respects, so the difference between the acoustic device 20 and the acoustic device 10 and the
operation thereof will be described below with reference to FIG.
[0079]
As shown in FIG. 2, the acoustic device 20 disposed at both ends of the lower portion of the
liquid crystal display device 29 has a speaker unit holding portion 1 a holding a pair of speaker
units 3 and a passive radiator holding a pair of passive radiators 5. The enclosure 21 is provided
with a holding portion 1c and a projecting portion 1b 'connecting the speaker unit holding
portion 1b and the passive radiator holding portion 1c.
That is, since the acoustic device 20 includes the pair of passive radiators 5 and the passive
radiator holding portion 1c, the acoustic device 20 differs from the acoustic device 10 in that it
has an H-shape.
[0080]
The pair of passive radiators 5 is disposed to face in the opposite direction. Therefore, the pair of
passive radiators 5 that vibrate with the vibration of the pair of speaker units 3 vibrate in
opposite directions on the same straight line. That is, the vibration by the pair of passive
radiators 5 is hardly transmitted to the enclosure 21 and the liquid crystal display device 29.
Therefore, the deterioration of the sound quality is largely suppressed or prevented.
[0081]
Here, the volume of the enclosure 21 is compensated not only by the protrusion 1 b ′ but also
by the passive radiator holding portion 1 c. Furthermore, the enclosure 21 is provided with a pair
of passive radiators 5. From these things, the sound in the low frequency range emitted from the
pair of speaker units 3 is further enhanced.
04-05-2019
21
[0082]
Further, the distance between the pair of speaker units 3 and the distance between the pair of
passive radiators are the same. That is, the lengths of the speaker unit holding portion 1b and the
passive radiator holding portion 1c (upper and lower lengths in the drawing) are the same.
Therefore, the acoustic device 20 can be easily incorporated into another device (here, the liquid
crystal display device 29).
[0083]
Further, the vibration direction of the pair of passive radiators is parallel to the vibration
direction of the pair of speaker units. That is, the speaker unit holding portion 1b and the passive
radiator holding portion 1c are arranged so that the length direction is parallel. Therefore, the
acoustic device 20 can be easily incorporated into another device (here, the liquid crystal display
device 29).
[0084]
Here, it is preferable that the speaker unit holding portion 1a, the projecting portion 1b 'and the
passive radiator holding portion 1c are joined so as to change the angle. For example, the
speaker unit holding portion 1a and the protruding portion 1b 'and the protruding portion 1b'
and the passive radiator holding portion 1c may be joined by a bellows-like elastic body. Also, for
example, the entire protrusion 1b 'may be formed of a bellows-like elastic body. Thereby, the
speaker unit holding portion 1b can be rotated relative to the passive radiator holding portion 1c.
That is, the radiation direction of the sound from the pair of speaker units 3 can be freely
changed.
[0085]
In the acoustic device 20, the pair of speaker units 3 is disposed near the end of the display unit,
and the pair of passive radiators 5 is disposed closer to the center of the display unit than the
pair of speaker units 3 There is. That is, the sound in all the ranges including the middle and high
04-05-2019
22
frequency range in which the human can easily sense the direction is emitted from the sound
source located farthest to the left or right in the liquid crystal display device 29. Therefore, the
stereo effect is improved because the user feels the sound image spreading clearly.
[0086]
On the other hand, in the acoustic device 20, the pair of speaker units 3 is disposed near the end
of the display unit, and the pair of speaker units 3 is disposed closer to the center of the display
unit than the pair of passive radiators 5. May be The low frequency sound radiated from the pair
of passive radiators 5 is less likely to be perceived by humans as the spread of the sound than
the middle high frequency sound. However, in the case of a large TV such as the liquid crystal
display device 29, since the distance between both ends is sufficiently large, the user can
perceive the low-range sound as a spread sound. With this configuration, it is possible to realize a
broad bass and provide the user with the comfort of being surrounded by sound.
[0087]
(Acoustic Device 30) The acoustic device 30 is common to the acoustic device 10 in many
respects, so the difference between the acoustic device 30 and the acoustic device 10 and the
operation thereof will be described below with reference to FIG.
[0088]
As shown in FIG. 3A, the acoustic device 30 disposed at both ends of the lower portion of the
liquid crystal display device 39 is joined to the speaker unit holding portion 1a holding the pair
of speaker units 3 and the speaker unit holding portion 1a It comprises an enclosure 31
consisting of a projection 1b ′ ′ having an opening 33 on the side opposite to the projection
and a covering 1d surrounding the projection 1b ′ ′ with a gap.
That is, the acoustic device 30 differs from the acoustic device 10 in that the protrusion 1 b ′ ′
has the opening 33 and is surrounded by the covering portion 1 d.
[0089]
04-05-2019
23
In the above configuration, among the sounds generated by the vibration of the pair of speaker
units 3, the sound radiated to the back side is the opening 33 of the protrusion 1b ′ ′ and the
gap between the protrusion 1b ′ ′ and the covering 1d It is emitted to the outside through
That is, the enclosure 31 is an enclosure provided with a bass reflex port. Thus, the sound in the
low frequency range emitted from the acoustic device 30 is further enhanced.
[0090]
Further, the covering portion 1 d surrounds the projecting portion 1 b ′ ′ close to the speaker
unit holding portion 1 a. For this reason, as shown in FIG. 3B, the sound of the low frequency
band passing through the bass reflex port is emitted from very close to the pair of speaker units
3.
[0091]
(Acoustic Device 40) The acoustic device 40 is common to the acoustic device 10 in many
respects, so the difference between the acoustic device 40 and the acoustic device 10 and the
operation thereof will be described below with reference to FIG.
[0092]
As shown in FIG. 4, the acoustic device 40 disposed at both ends of the lower portion of the
liquid crystal display device 49 has a speaker unit holding portion 1a for holding the pair of
speaker units 3 and a projecting portion 1b 'having the speaker unit 41 inside. And the
projection 1b.
That is, the acoustic device 40 differs from the acoustic device 10 in that the speaker unit 41 is
further formed inside the protrusion 1 b.
[0093]
The speaker unit 41 vibrates in synchronization with the pair of speaker units 3. For example,
when the pair of speaker units 3 swings in the direction in which the pressure in the enclosure 1
decreases (front side), the speaker unit 41 swings in the direction in which the pressure in the
04-05-2019
24
enclosure 1 increases (speaker unit holding portion 1a side). On the other hand, when the pair of
speaker units 3 swings in the direction in which the pressure in the enclosure 1 rises (back side),
the speaker unit 41 reduces the pressure in the enclosure 1 (opposite to the speaker unit holding
portion 1a) Shake. That is, the speaker unit 41 vibrates such that the amount of change in
pressure inside the enclosure 1 which changes due to the vibration of the pair of speaker units 3
is reduced. Therefore, the speaker unit 41 reduces the factor of reducing the amplitude of the
pair of speaker units 3. For this reason, the sound pressure of the sound radiated from the pair of
speaker units 3 is improved.
[0094]
(Liquid Crystal Display Device 9) An example of a combination of the acoustic device 10 and the
liquid crystal display device 9 will be described below with reference to FIG.
[0095]
As shown in FIG. 5A, the two acoustic devices 10 are attached to both ends of the lower portion
of the liquid crystal display device 9.
That is, the liquid crystal display device is an under-speaker type display device. Each of the two
acoustic devices 10 is arranged such that the speaker unit holding portion 1 a is located near the
end of the liquid crystal display device 9. That is, the two acoustic devices 10 are disposed at
inconspicuous positions of the large screen and thin liquid crystal display device 9. As described
above, since the acoustic device 10 does not transmit vibration to the liquid crystal display
device 9 by the radiation of sound, the speaker units 3 are disposed at inconspicuous positions
such as the four corners of the housing in the liquid crystal display device 9 can do. Thus, the
design of the liquid crystal display device 9 can be extracted to enable the arrangement of the
acoustic device 10.
[0096]
As shown in FIG. 5 (b), among the pair of speaker units 3, the speaker unit 3 on the front side of
the liquid crystal display device 9 is not parallel to the display portion but faces the center side of
the liquid crystal display device 9. There is. Here, since the liquid crystal display device 9 has a
large screen, when the sounds from the left and right acoustic devices 10 are radiated directly in
front of one another, the sounds from the left and right acoustic devices 10 are separated
04-05-2019
25
depending on the position viewed by the user. It sounds like the user did. However, with the
above configuration, the user can listen to the sounds from the left and right acoustic devices 10
as more natural sounds. Further, among the pair of speaker units 3, the speaker unit 3 on the
back side of the liquid crystal display device 9 faces the outside of the liquid crystal display
device 9. For this reason, as when the speaker unit 3 is facing directly behind, no sound is
trapped between the wall surface on the back side and the liquid crystal display device 9 and is
reflected to the wall surface etc. on the back side to the front side. The sound goes around.
Therefore, the user can listen to the sound from the back side as a more natural sound.
[0097]
Although the liquid crystal display device 9 including the acoustic device 10 has been described
here, the liquid crystal display device 29 including the acoustic device 20, the liquid crystal
display device 39 including the acoustic device 30, and the liquid crystal display device 49
including the acoustic device 40 It has the same action. Furthermore, although the under-speaker
type liquid crystal display device 9 has been described here, the liquid crystal display device 9
may be an up-speaker type display device in which the acoustic device 10 is attached to both
ends of the upper portion of the display unit.
[0098]
Second Embodiment Another embodiment of the present invention will be described below with
reference to FIGS. FIG. 6 is a perspective view showing the configuration of an acoustic device 60
according to another embodiment of the present invention. FIG. 7 is a perspective view showing
the configuration of an acoustic device 70 which is a modification of FIG. 8 (a) is a perspective
view showing the configuration of an acoustic device 80 which is another modification of FIG. 6,
and FIG. 8 (b) is a perspective view showing the configuration when the arrangement direction of
(a) is changed. FIG. 9 (a) is a plan view showing an arrangement example of the acoustic device
70 of FIG. 7 in the liquid crystal display 79, and FIG. 9 (b) is a cross-sectional view of (a).
[0099]
(Acoustic Device 60) As shown in FIG. 6, a liquid crystal display device (display device) 69 having
a large screen and being a thin TV is provided with an acoustic device 60 one by one on both
sides of the display unit. ing. The acoustic device 60 includes a pair of speaker units 3 that
04-05-2019
26
vibrate in opposite directions on substantially the same straight line (the central axis of the
speaker units), and a cylindrical enclosure (casing) 61. The pair of speaker units 3 is held at the
longitudinal end of the enclosure 61.
[0100]
Here, the volume of the enclosure 61 is limited by the thickness of the liquid crystal display
device 9. However, the enclosure 61 has substantially the same length as the vertical length of
the display unit. For this reason, when it applies to the liquid crystal display device 69 which has
a big screen, the volume inside enclosure 61 is fully ensured.
[0101]
Furthermore, as described above, the pair of speaker units 3 having substantially the same
aperture vibrate in opposite directions on substantially the same straight line. Thus, the pair of
speaker units 3 has the same function as that of the first embodiment. That is, the deterioration
of the sound quality when combined with another device in the acoustic device is suppressed.
Further, the acoustic device 60 can be disposed at an inconspicuous position such as the side
portion of the display portion of the liquid crystal display device 69.
[0102]
As described above, the pair of speaker units 3 vibrate in the opposite direction to emit sound.
Therefore, since the acoustic device 60 emits sound in the vertical direction as viewed from the
user, the acoustic device 60 is reflected on the floor surface and the ceiling of the space in which
the liquid crystal display device 69 is disposed, and the acoustic characteristics are improved. As
a result, the user is made to feel that the position of the sound source point and the position of
the speaker unit are more in agreement, and the user is made to feel the spread of the sound
field. Further, in the acoustic device 60, only the upper speaker unit 3 or only the lower speaker
unit 3 may be vibrated to emit sound. Also, as mentioned above, two acoustic devices 60 are
arranged on both sides of the display. Therefore, when different images are displayed in the right
half and the left half of the display unit, the right audio device 60 emits sound related to the
image of the right half of the display unit, and the left audio device 60 It is also possible to emit
audio relating to the left half image.
04-05-2019
27
[0103]
Here, the shape of the enclosure 61 is cylindrical. Having a streamlined inner shape, such as a
cylindrical shape, is effective for reducing wind noise in the enclosure 61 caused by the vibration
of the speaker unit 3. However, the enclosure 61 is not limited to a cylindrical shape, and may
have a columnar shape such as a triangular prism, a square prism, a polygonal prism such as a
pentagonal prism and a hexagonal prism, and a cylindrical cross section having an oval shape.
[0104]
(Acoustic Device 70) The acoustic device 70 is common to the acoustic device 60 in many
respects, so the difference between the acoustic device 70 and the acoustic device 20 and the
operation thereof will be described below with reference to FIG.
[0105]
As shown in FIG. 7, a liquid crystal display 79 which has a large screen and is a thin TV has an
acoustic device 70 one on each side of the display unit.
The acoustic device 70 includes a pair of speaker units 3 that vibrate in opposite directions on
substantially the same straight line, a pair of passive radiators 5 that vibrate in opposite
directions on substantially the same straight line, and a cylindrical enclosure 71. The pair of
speaker units 3 is held in the vicinity of the center of the curved surface of the enclosure 71 with
respect to the long axis direction. The pair of passive radiators 5 is held at the longitudinal end of
the enclosure 71. That is, the acoustic device 70 differs from the acoustic device 60 in including
the pair of passive radiators 5 and in the position where the pair of speaker units 3 is held.
Therefore, since the acoustic device 70 includes the pair of passive radiators 5, the sound in the
low range is further enhanced.
[0106]
(Acoustic Device 80) As shown in FIG. 8A, the acoustic device 80 is provided with a square pole
enclosure 81, a pair of speaker units 3, and a pair of passive radiators 5. The acoustic device 80
has the same configuration as the acoustic device 20 except for the shape of the enclosure 61.
04-05-2019
28
The enclosure 61 has a columnar shape similar to the acoustic devices 60 and 70. Therefore, the
details of the configuration of the sound device 80 may be referred to the sections of (sound
device 20) and (sound device 70) as appropriate. FIG. 8A shows a case where the present
invention is applied to a display device of the under-speaker type or the up-speaker type,
similarly to the acoustic devices 10 to 40 described in the section of [Embodiment 1]. FIG. 8B
shows the case of application to a side speaker type display device.
[0107]
(Liquid Crystal Display Device 79) An example of a combination of the acoustic device 70 and the
liquid crystal display device 79 will be described below with reference to FIG.
[0108]
As shown in FIG. 9A, the two acoustic devices 70 are attached to both sides of the liquid crystal
display device 79.
That is, the liquid crystal display device 79 is a display device of a side speaker type in which the
two sound devices 70 are attached inconspicuously. The acoustic device 70 does not transmit
vibration to the liquid crystal display device 79 by the emission of sound, so that the speaker unit
3 can be disposed in an inconspicuous position such as an end portion of the housing in the
liquid crystal display device 79. . Therefore, the arrangement of the acoustic device 70 is made
possible, which brings out the design of the liquid crystal display device 79.
[0109]
As shown in FIG. 9B, of the pair of speaker units 3, the speaker unit 3 on the front side faces the
center side of the liquid crystal display device 79, and the speaker unit 3 on the back side is a
liquid crystal display It faces the outside of the device 79. That is, it is the same as the
arrangement of the acoustic device 10 in the section of (liquid crystal display device 9). However,
since the acoustic device 70 is attached to both ends of the display unit of the liquid crystal
display device 79, the sound from the speaker unit 3 on the back side can more efficiently get
around to the front side.
[0110]
04-05-2019
29
Here, although the liquid crystal display device 79 provided with the acoustic device 70 has been
described, the liquid crystal display device 69 provided with the acoustic device 60 also has the
same function. In particular, in the liquid crystal display device 69 including the acoustic device
60, the two pairs of speaker units 3 are attached to the four corners of the liquid crystal display
device 69. For this reason, since the speaker unit 3 can be arrange | positioned in the position
which is not conspicuous more, the design property of the liquid crystal display device 69 can be
pulled out more.
[0111]
According to the present invention, it is possible to realize an acoustic device that achieves
improvement in sound quality as well as downsizing and thinning. For this reason, it is applicable
to the whole of the apparatus which emits a sound. In particular, when applied to a large liquid
crystal display device, it is very effective.
[0112]
It is a perspective view showing the composition of the sound equipment concerning one
embodiment of the present invention. It is a perspective view which shows the structure of the
modification of FIG. (A) is a perspective view which shows the structure of the other modification
of FIG. 1, (b) is a perspective view which shows the radiation | emission part of the sound in the
acoustic apparatus of (a). It is a perspective view which shows the structure of the further
another modification of FIG. (A) is a top view which shows the example of arrangement |
positioning of the acoustic apparatus of FIG. 1 in a liquid crystal display device, (b) is sectional
drawing of (a). It is a perspective view which shows the structure of the acoustic apparatus
concerning other embodiment of this invention. It is a perspective view which shows the
structure of the modification of FIG. (A) is a perspective view which shows the structure of the
other modification of FIG. 6, (b) is a perspective view which shows a structure when the
arrangement direction of (a) is changed. (A) is a top view which shows the example of
arrangement | positioning of the acoustic apparatus of FIG. 7 in a liquid crystal display device, (b)
is sectional drawing of (a).
Explanation of sign
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[0113]
DESCRIPTION OF SYMBOLS 1 enclosure (housing | casing) 1b protrusion part 1b 'protrusion
part 1b' 'protrusion part 1d cover part 3 speaker unit 5 passive radiator 9 liquid crystal display
device (display device) 10 acoustic device 20 acoustic device 21 enclosure (casing) 29 liquid
crystal display Device (display device) 30 Acoustic device 31 Enclosure (chassis) 33 Opening 39
Liquid crystal display device (display device) 40 Acoustic device 41 Enclosure (chassis) 49 Liquid
crystal display device (display device) 60 Acoustic device 61 Enclosure (chassis) ) 69 liquid
crystal display (display) 70 acoustic device 71 enclosure (casing) 79 liquid crystal display
(display)
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