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JP2005079962

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2005079962
PROBLEM TO BE SOLVED: To provide a flat panel speaker with good acoustic characteristics
using a honeycomb panel with high bending rigidity. SOLUTION: The screen speaker indicated by
the reference numeral 200 as a whole is made of one honeycomb panel, is lightweight, is easy to
install and handle, and may be attached by a hanging strap 260. The screen film 210 is adhered
to one surface of the honeycomb panel 250 serving as a diaphragm, and the exciters 231a, b, c
and 232a, b, c are attached to the other surface of the honeycomb panel 250. A screen panel
composed of one honeycomb panel with high bending rigidity vibrates like a fan, and vibration
nodes are generated in a vertical straight line. Therefore, a plurality of exciters 231a, b, c and
232a, b, c are mounted on the vibration node line NL. Since the mass distribution of the panel
can be regarded as almost uniform, the mounting position (width) of the exciter is 0.5774 times
the full screen width, as theoretically expected. [Selected figure] Figure 8
フラットパネルスピーカー
[0001]
The present invention relates to a flat panel flat panel speaker that vibrates a flat panel to emit
two channels of stereo sound.
[0002]
Heretofore, there has been a speaker that emits sound by vibrating a flat panel flat panel as a
diaphragm and attaching an exciter to the diaphragm.
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FIG. 16 shows a basic example of a flat panel speaker, where (a) shows the front surface and (b)
shows the exciter mounting condition on the back surface. (C) is a sectional view. The flat panel
speaker 10 having one panel as one vibration system has a vibration system including the
diaphragm 11 and the exciter 12. A frame 13 supports the diaphragm 11 and the exciter 12. The
diaphragm is fixed to the frame 13 via a flexible material 14.
[0003]
[Divided resonant vibration of panel] Basically, the diaphragm panel is integrated to expect sound
emission by a simple piston movement (collective vibration), but the panel used for the
diaphragm 11 is unique Because it has bending stiffness and mass distribution, it resonates at a
certain frequency. Resonance occurs at a plurality of frequencies, and the strength is also
different because the panel bends and vibrates overall or vibrates locally depending on the
frequency to show different vibration forms. The resonance is stronger as the panel with lower
flexural rigidity and higher density and the panel with larger aspect ratio and lower flexural
rigidity. When the panel resonates, the radiation of that frequency is intensified, and the
frequency before and after it exhibits the property of becoming weak, so peaks and dips appear
on the frequency characteristics. The resonance sound that makes these peaks and dips is called
"buzzing" and is considered to be the largest cause of sound quality degradation. About a dozen
years ago, flat panel speakers were actively researched, but the sound quality deterioration due
to this "buzzing" can not be resolved and has not been widespread.
[0004]
[Control of Vibration Mode] For example, the invention referred to as DM panel speaker
(Distributed Mode panel Loudspeaker) of UK company NXT disclosed in Patent Document 1
below selects the exciter mounting position of the flat panel speaker, and vibrates the panel. The
distribution mode (Distributed Mode) is controlled to reduce peaks and dips. Essentially, the
present invention takes advantage of the fact that the ceiling and wall have relatively low (finite)
bending stiffness, and the panel density, aspect ratio, bending stiffness value, their distribution
condition, peripheral fixed state Since the large panel such as the ceiling or the wall is locally
vibrated to emit a sound with good sound quality by selecting the mounting position of the
exciter from the above, the present invention is more effective than suppressing the resonance.
Rather, it is a method of utilizing resonance. Although this technology is also applied to ordinary
flat speakers, the frequency characteristics of the flat panel speaker to which this technology is
applied is shown in FIG. 18, but as can be seen in the characteristic chart, the bass characteristic
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is another flat panel speaker It is superior to, but has not eliminated the large peaks and dips. In
addition, when applied to a panel having a high bending stiffness value, it is difficult to obtain a
required acoustic characteristic (in particular, a stereo characteristic).
[0005]
There are also cases where two exciters are attached to one diaphragm in order to improve the
acoustic output or to improve the vibration mode of the panel, but these exciters use the same
electric drive source. Because it was excited in phase, it was not possible to emit two channels of
stereo sound from one panel. [Attachment of Flat Panel Speaker] In the conventional flat panel
speaker, the entire surface of the diaphragm vibrates regardless of the form of vibration, so as
shown in FIG. , And the frame 13 needs to be attached to and fixed to a device or an object. If the
vibration transmission cutoff by the flexible material 14 is not sufficiently effective, the vibration
is transmitted to the precise device and adversely affects, but the diaphragm can not vibrate
freely, so the mounting method is not simple.
[0006]
[Stereo Acoustic Radiation] Conventionally, there has been an example of a large screen speaker
whose surface is a video screen by utilizing the fact that the surface of the diaphragm of the flat
panel speaker is flat. Modern cinematic sound requires at least two channels of stereo sound, so
it requires two independently vibrating speakers. Usually, a pair of two speakers are installed on
both sides of the screen, but a screen speaker is required because of the space. FIG. 17A is an
explanatory view showing an outline of one example of a screen speaker projection system
emitting two-channel stereo sound of a conventional product. The screen projection system,
generally indicated at 20, has a projector 30 and a screen speaker 40, and an image from the
projector 30 is projected on the surface of the screen speaker 40. FIG. 17B is a schematic
explanatory view showing the back of the screen speaker 40. The screen speaker 40 has one
screen film 42 on which an image is projected, and one set of the screen speaker 42 is provided
on the back of the screen film 42. Flat panel speakers 51 and 52 are separately attached to the
frame 61. The left and right speakers 51, 52 have diaphragms 51a, 52a adhered to the back
surface of the screen film 42, and exciters 51b, 52b attached to the diaphragms 51a, 52a. The
screen film 42 is stretched around the periphery of the base 60 through the springs 62 to form a
projection surface, so a strong base structure is required, which is heavy and expensive. An
application of the technology for controlling the vibration distribution of the panel according to
the invention of NXT is an example in which two exciters are mounted on one large panel and
vibrated locally to emit stereo sound. This method basically uses the low flexural rigidity of the
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panel to expect the required vibration form, but when the flexural rigidity of the diaphragm is
low, it is not possible to reproduce a crisp sound There are drawbacks such as poor acoustic
efficiency and the appearance of offensive "buzzing" phenomena that interfere with the sound
quality. If bending stiffness is increased, it is difficult for divided vibration to occur in the panel,
and the required vibration distribution form can not be obtained. Thus, according to the NXT
method, even if radiation of stereo sound is expected, sufficient channel spacing can be obtained.
It is not popular because it does not provide satisfactory stereo sound because separation can not
be obtained.
[0007]
International Publication WO 97/09853
[0008]
The object of the present invention is to improve the vibration of the panel of the flat panel
speaker so as to emit a good sound with less split resonance, to be easily attached to a precise
device, and to separate from a single panel. Good two-channel stereo sound to emit.
These are applied not only to a single flat panel speaker but also as a large screen speaker or a
speaker for a liquid crystal television or plasma display characterized by a thin shape.
[0009]
In the present invention, as a basic means for solving the problem, the vibration position and the
position of the node (node) ND resulting from it are studied in the case where one panel with
high rigidity value is a diaphragm. Then, the exciter was attached to the panel, and the panel was
vibrated in a simple fan-like vibration form called Fan Mode shown in FIG. In the fan-shaped
vibration mode, since the node line can be on a straight line, a plurality of exciters can be
mounted on the node line according to the output demand. By this method, it is possible to use a
material such as a honeycomb panel having a light weight and a high bending rigidity value as
the diaphragm panel, the vibration form is simplified, and the adverse effect due to the resonance
can be reduced. First, when the nodal line of fan-like vibration is matched with one end of the
diaphragm, the amplitude of the end becomes zero, so that even if it is simply attached to a
precise device with a hinge or the like, there is no adverse effect on each other. Furthermore, in
order to radiate stereo sound, the position where the excitation position and the node are
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symmetrical is found out, and the left and right exciters are mounted at that position, and the
diaphragm is excited by different signals. A simple fan-like vibration method is shown. Although
the theory and calculation regarding the mounting position will be described in detail later, the
exciter on the right remains stationary even if the exciter on the left causes the panel to fan-likely
vibrate. Even if the right exciter gives a fan-like vibration to the panel, the left exciter is still
without influence. When the left and right exciters vibrate separately, the diaphragm radiates the
respective sound from the left and right, so stereo sound with sufficient separation between
channels can be emitted.
[0010]
[Characteristics of simple fan-like vibration] As mentioned above, partial resonance of the panel
makes peaks and dips to deteriorate the sound quality, so it is required to use a panel with a
sufficiently high bending stiffness value as the diaphragm. Be The means of the present invention
does not expect partial or partial vibration of the panel, but vibrates the panel in a simple fan-like
shape, so that a panel having an infinitely high bending stiffness value can be used for the
diaphragm. In addition, since the vibration nodes are vertically aligned, according to the sound
output, a plurality of exciters can be arranged in a straight line and can be excited in the same
phase. By increasing the number of mountings, the fan-like vibration of the panel can be
improved to suppress an offensive peak caused by the resonance of the panel. Further, since the
radiation distribution of the sound from the panel is different, the radiation position of the sound
is shifted not to the center of the panel but to the side where the exciter is attached, so this
characteristic is useful as described in the later embodiments. As described above, the present
invention is fundamentally different from NXT's divided vibration technology in that partial
resonance of the panel is suppressed by vibrating the panel in a simple fan shape instead of
divided vibration. It is a technology and the theory is different.
[0011]
[Materials constituting the panel] If the flexural rigidity of the diaphragm is low, the diaphragm
vibrates even in the mid-low range to deteriorate the sound quality. Therefore, it is necessary to
configure the diaphragm from a lightweight panel with sufficiently high flexural rigidity. . Panel
density should be discussed in terms of mass per unit area, but for convenience is discussed in
terms of weight per area. The density of the following honeycomb panel is 1.3 Kg / square meter,
which corresponds to the density of the body plate of a violin or cello, so it has a reproducible
element up to a sufficiently high tone range. The bending stiffness value of the panel is
proportional to the Young's modulus: E possessed by the material and the moment of inertia of
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area, but in the case of a honeycomb panel, it is calculated excluding the core portion. In the
present invention, as a material of the diaphragm, a composite material in which a glass fiber
having a high tensile / compression elastic modulus is solidified with an epoxy resin is used as a
surface layer material, and a honeycomb core made of alamid fiber having a high shear elastic
modulus is used as a core material. Decided to use a sandwich panel. We tried to use a carbon
fiber composite material with higher elastic modulus as the surface material, but because the
stress / strain linearity was good, the function of absorbing the resonance was lacking, and the
resonance in the high frequency range was noticeable. A theoretical description of the location of
the oscillating node is provided below, along with supporting calculations.
[0012]
[Theory of Fan-Like Vibration Form] In describing a method of radiating a sound by giving a fanshaped vibration to a panel, first, the motion of a rod-like object (hereinafter, an object) will be
described using FIG. As shown in FIG. 1 (a), when a force F acts on the center-of-gravity positions
C and G of an elongated object B whose central portion is suspended by a thread S, a linear
acceleration α1 is generated on the object in the direction in which the force is applied. Start
exercising. The magnitude of the linear acceleration α1 is proportional to the magnitude of the
force F and inversely proportional to the mass of the object, but is uniform in each part of the
object. The magnitude of the linear acceleration α1 is expressed by the following equation: F =
W / g × α1. As shown in FIG. 1B, when a rotational moment M is applied to the barycentric
positions C and G of the elongated object B floating in the air, a rotational angular acceleration γ
is generated on the object. The rotational angular acceleration γ generated in the object is
proportional to the magnitude of the moment M and inversely proportional to the mass moment
of inertia (moment of inertia) I of the object. The rotational angular acceleration γ can be
expressed by the following equation: γ = M / I. Due to this rotational angular acceleration γ, an
acceleration α2 associated with the rotation is generated at each position of the object. The
magnitude of the acceleration α2 accompanying the rotation increases in proportion to the
distance d from the position of the center of gravity. The acceleration α2 accompanying the
rotation can be expressed as α2 = γ × d. As shown in FIG. 1C, when a force F acts on the object
at a distance P away from the barycentric positions C and G of the object, the rotational moment
applied simultaneously with the linear acceleration α1 generated in the direction of the force F
at the barycentric position. The angular acceleration γ is generated by M = p × F). In FIG. 1C, at
the right side of the barycentric positions C and G (the side on which the force is applied), the
linear acceleration α1 by the force F and the rotational acceleration α2 (= γ × d)
accompanying the angular acceleration γ are added (α = α1 + α2) The linear acceleration
.alpha.1 and the rotational acceleration .alpha.2 are subtracted (.alpha. =. Alpha.1-.alpha.2) on the
left side of the barycentric positions C and G). When conditions such as the length of the object,
the position to which a force is applied, and the mass distribution are satisfied, the acceleration
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α1 and the rotational acceleration α2 have the same value at a certain position Q on the left
side of the object, and the acceleration α becomes zero. The position Q at which the acceleration
α is zero has nothing to do with the magnitude of the force F or positive or negative, so the
position Q at which the acceleration is zero becomes a vibration node even if the point P to which
the force is applied gives back and forth vibration. It does not vibrate. FIG. 2 and FIG. 3 are
explanatory views for explaining that the vibration node changes in accordance with the
mounting position when mounting the exciter EX on the panel PL. As described above, when the
exciter EX is attached to the center of the panel PL, ie, the center of gravity, and the force F is
applied, the panel PL only translates, and the position Q at which the acceleration α becomes
zero is in the far side of infinity. It will be.
When the position P to which the force F is applied is moved from the barycentric positions C
and G, the position Q at which the acceleration α becomes zero approaches the object with
movement, and eventually coincides with the end of the object. Here, when the exciter is attached
to a position P to which a force F is applied and is vibrated, the panel PL performs a simple fanlike vibration with an end portion as a vibration node ND. As shown in FIG. 3, when the position
P to which the force F is applied is further away from the barycentric positions C and G, the
position P to which the force is applied and the position Q at which the acceleration becomes
zero are symmetrical positions. Even if the point P is excited, the point Q does not vibrate, and
even if the point Q is excited, the point P does not vibrate. When applied to the panel PL, it
becomes a diaphragm that emits sound of two channels.
[0013]
[Theoretical calculation] First, theoretical calculation was performed to obtain the position of the
vibration node which is a singular point. In the theoretical calculation, the above calculation is
carried out for an elongated rod-like object having uniform mass and floating in the air, and the
linear acceleration α1 and the rotational acceleration α2 due to the force F are subtracted (α =
α1-α2), and the acceleration is reduced to zero. Position was determined. Then, the position of
the point P was determined from the ratio to the total length under the condition that the
position where the acceleration becomes zero coincides with the end of the rod-like object. Next,
with respect to radiation of stereophonic sound, the position of points P and Q was determined
from the ratio to the total length under the condition that the position where the force F is
applied and the position where the acceleration becomes zero are symmetrical. Body length: L
body weight: W body mass: W / g distance from the center of gravity to the force point P: p
distance between the center of gravity and the point Q at zero acceleration: q mass inertia
moment of the body: I mass is For uniform objects, I = W / g × L <2> / 12 Force applied to the
object: F Moment applied to the object: M = F × p Linear acceleration generated on the object:
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α1 = F ÷ W / g Angle generated on the object Acceleration: γ = M ÷ I Distance from center of
gravity to each point: d Rotational acceleration generated at each point by angular acceleration:
α2 = γ × d Combined acceleration generated at each point of object: α = α1 + α2 generated
at point Q of object Synthetic acceleration: α = α1 + α2 = 0. When a force F is applied to the
barycentric positions C and G of the object, the object generates a linear acceleration in the
direction of the force and starts parallel movement. The acceleration α1 in that case is α1 = F
× g / W. When a force F is applied to a point away from the center of gravity C, G of the object, a
linear acceleration is generated in the direction of the force F at the center of gravity of the
object, and the whole starts parallel movement and a rotational angular acceleration γ is given.
Start rotating around the center of gravity position. In that case, the linear acceleration α 1 is α
1 = F × g / W, and the rotational angular acceleration γ is γ = M ÷ I = F × p ÷ I = (F × p) ×
(12 × g) ÷ (W × L <2>). The rotational acceleration generated at each point by the rotational
angular acceleration γ is represented by the product of the rotational angular acceleration and
the distance from the center of gravity. That is, α2 = γ × d where the acceleration is deducted
and zero at the point of q = L / 2, and α1 = α2 = γ × d is substituted into the above formula (F
× p × 12 × g ) (W × L <2> × p) = F × g / W M = F × q 6 p = L p = 0.1666 L is obtained. That
is, it can be seen that in an elongated object having a uniform mass, when a force is applied to a
position 0.1666 times the length of the object from the position of the center of gravity, the
resultant acceleration at the opposite object end becomes zero.
Even if it is applied to an elongated panel with uniform mass, the above theory holds, and by
mounting the exciter at a distance of 0.1666 times the length of the panel from the center, the
end is used as a node line It can be vibrated. Next, for the radiation of stereophonic sound, from
the condition of left-right symmetry, from the condition of acceleration minus at p = q Q and the
condition of zero, substituting α1 = α2 = γ × d into the above equation, (F × p × 12 × g) ÷
(W × L <2> × p) = F × g / W M = F × q 1/12 = q <2> / L <2> q / L = √1 / 12 = 0.22887
obtain. When applied to a panel with uniform mass, it can be seen that when a position 0.2887
times the length of the panel from the center of gravity is excited, the resultant acceleration is
zero at the point of symmetry, and a node line is formed. Therefore, the distance between the
mounting positions of the exciters is 0.2887 × 2 = 0.5774 times the panel width. The
relationship between the excitation point and the node line is shown in FIG.
[0014]
[Backing calculation] Backing calculation calculates the linear acceleration, the rotational angular
acceleration, the rotational acceleration based on the rotational angular acceleration, and their
composite value that occur at each position of the object when the force is applied to the tip of
the elongated object first. The position where the acceleration was zero was calculated. Then, the
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position where the force is applied is calculated by moving the position of the force little inward
from the tip of the object, and the position where the force is applied and the position of zero
acceleration are equal until the left and right become equal. It was confirmed that the distance
was 0.2887 times. Furthermore, as a result of continuing calculation until the position of zero
acceleration coincides with the other end of the object, it is confirmed that the position to apply
force is a position from the center at a distance of 0.1666 times the length of the object. The
calculation results are shown in FIG.
[0015]
According to the present invention, by vibrating the panel in a fan-like manner, it is possible to
reduce the "plate noise" phenomenon due to resonance which is a drawback of the conventional
flat panel speaker, and furthermore, two flat stereo sound from one flat panel speaker. The
speaker system that radiates can be configured with a simple structure. By applying the stereo
speaker according to the present invention to a screen speaker, a screen speaker having a simple
structure could be provided. In addition, flat panel speakers can now be easily attached directly
to precision equipment.
[0016]
Hereinafter, an embodiment of the present invention will be described.
[0017]
FIG. 5 is an explanatory view showing the structure of a basic speaker that emits stereo sound in
one panel by vibrating the panel 100 in a simple fan-like manner according to a representative
embodiment of the present invention.
The size of the honeycomb panel constituting the diaphragm is 340 mm in height H and 600 mm
in full width L. FIG. 6 (a) shows a cross sectional view. The stereo speaker generally indicated by
reference numeral 100 has a structure in which a decorative film 110 is adhered to the surface
of a honeycomb panel 150 serving as a diaphragm, and exciters 131a and 131b are attached to
the back surface of the honeycomb panel 150. The left and right exciters are attached to the base
panel 160. The base panel is breathable so as not to disturb the vibration of the diaphragm. The
diaphragm panel 150 and the base panel are held by the flexible rim 154 around the periphery
of the panel and are close to the condition of theoretical calculation that they float in the air. FIG.
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6 (b) shows the vibration mode when only the exciter of the left channel gives vibration, and FIG.
6 (c) shows the vibration mode of the right channel. The maximum amplitude is about ± 3 mm.
FIG. 7 shows the structure of a honeycomb panel 150 that constitutes a diaphragm of a speaker.
The honeycomb panel 150 is light in weight and secures high bending rigidity to suppress
divided vibration of the panel and obtain a vibration form as theoretical, the glass fiber woven
fabric is made of epoxy resin in the honeycomb core material 151 made of aramid fiber. It has a
structure in which the hardened surface material 152, 153 is adhered. Since the mass
distribution of the panel can be regarded as uniform with little influence of the lightweight rims,
basically, the mounting interval of the exciter is 0.5774 times the full width of the panel, that is,
the spacing between the left and right exciters is 346 mm. .
[0018]
FIG. 8 is an explanatory view showing a structure of a screen speaker in which the flat panel
speaker of the present invention is applied to a video screen. The screen speaker, which is
generally indicated by reference numeral 200, is formed of a single honeycomb panel, is
lightweight, is easy to install and handle, and may be attached by a hanging strap 260. The
screen film 210 is adhered to one surface of the honeycomb panel 250 serving as a diaphragm,
and the exciters 231a, b, c and 232a, b, c are attached to the other surface of the honeycomb
panel 250. The size of the screen panel is 82 inches in size (1100 mm long and 1800 mm wide),
FIG. 8 (a) shows the front surface, and FIG. 8 (b) shows the back surface. A screen panel
composed of one honeycomb panel with high bending rigidity vibrates like a fan, and vibration
nodes are generated in a vertical straight line. Therefore, a plurality of exciters 231a, b, c and
232a, b, c are mounted on the vibration node line NL. Since the mass distribution of the panel
can be regarded as substantially uniform, the mounting position (width) of the exciter is, as
theoretical, 0.5774 times the full width of the screen, ie 1060 mm.
[0019]
FIG. 9 shows a single flat panel speaker that vibrates the diaphragm in a fan shape, and is an
example in which speaker panels 320 and 330 are mounted on both sides of a large flat display
310 via hinges 312 and 314. The panels 320 and 330 on both sides are mounted at the hinges
312 and 314, and are an example in which the display side is not adversely affected by vibration
by causing the hinge line to fan-likely vibrate as a vibration node. Reproduction of the bass is
also advantageous as the panel vibrates freely without being affected by the installation.
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[0020]
FIG. 10 shows an example in which a single flat panel speaker 420, 430 is mounted on both
sides of a large flat display 410 via hinges 412, 415. As shown in FIG. 11, in this example, the
elongated diaphragm panel 420a is divided into two parts, and their acoustic characteristics are
complemented to eliminate peaks and dips to obtain flat frequency characteristics. The frequency
characteristics of the speaker are shown in FIG. As a method of complementing each other's
acoustic characteristics, it is characterized that they physically connect the respective panel tips.
The sound separately emitted from each panel is combined with the sound pressure to reach the
ear, but in this example, the elongated diaphragm panel is divided into two equally and
intentionally changing the acoustic characteristics of each. By physically connecting the panel
ends, the self-directed vibration of each panel is suppressed to each other. This method can be
adopted by vibrating each panel in a fan-like manner. On a large screen flat display, depending
on the installation position of the speaker, there is a sense of discomfort that no sound comes out
from the mouth of the person image, but in this example, the fan-shaped maximum amplitude
position, that is, the junction of each panel Because it is aligned with the position of the mouth,
there is an effect that the pronunciation agrees with the talking video.
[0021]
Since the flat panel speaker according to the present invention is thin and can emit stereo sound
of two channels from one panel, it can be used in combination with a liquid crystal television or
the like. In this case, since the viewer is to be attached or installed on the back of the liquid
crystal television or the like, the viewer hears not the direct sound but the reflected sound from
the wall. An example was also tried in which the spread of the reflected sound was expanded by
giving a curved surface to the panel, but since the curved surface panel of the honeycomb
structure has high bending rigidity, the same theory as the flat panel can be applied. In the
experiment, even with a flat panel speaker, a sufficient stereo feeling could be obtained. FIG. 13
shows an example in which the flat panel speaker according to the present invention is installed
on the back of the liquid crystal television 500, and FIG. 13 (a) shows the surface when attached
to the liquid crystal television and FIG. 13 (b) shows the back. . The liquid crystal television 500
has a liquid crystal display panel 510 and a flat panel speaker 520 mounted on the back surface
thereof. The flat panel speaker 520 has a curved panel, and a space 530 is formed between the
flat panel speaker 520 and the liquid crystal display panel 510. Stereo sound So is emitted
through this space. Also, the air flow passing through the space 530 is used to cool the liquid
crystal display panel. The sound emitted backward from the flat panel speaker is reflected on the
wall and diffused to the front. The panel speaker may be attached and fixed to the liquid crystal
television main body, but may be installed independently by providing a gap. Instead of the liquid
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crystal television, it can be attached or installed in the same form on the plasma display. FIG. 14
shows an example in which the flat panel speaker of the present invention is applied to a radio /
CD component stereo device 600. FIG. 14 (a) shows the front surface, and FIG. 14 (b) shows the
back surface. The component stereo device 600 has a CD player 610, an amplifier 612, an
antenna 614, and left and right acoustic radiation units 630, 640. The back of the device is
equipped with a flat panel speaker 620. The stereo sound emitted from the back reflects off the
wall of the room to provide a broad stereo sound.
[0022]
FIG. 15 shows an example in which two single flat panel speakers vibrating in a fan shape are
combined to form a stereo speaker. Even in the example shown in the first embodiment,
satisfactory stereo sound can be obtained, but if it is not possible to suppress the resonance of
the panel if the distance between the two channels is further extended to improve the sense of
stereo by using a horizontally long panel. There is. The flat speaker generally designated by
reference numeral 700 has a left speaker portion 710 and a right speaker portion 720 at the
node line NL. Then, the exciters 712 and 722 are attached at positions where the node line NL is
formed. FIG. 15C shows a two-part follow speaker. The center of the sound So of the left and
right speaker panels 750 and 760 is the center of the panel, and the channel width W1 of the left
and right sound is narrower than the channel width W2 of the center of the sound So of the flat
speaker of the present invention. In this embodiment, the vibration system of the panel is divided
into two, which is advantageous in terms of resonance suppression. Channel spacing can also be
increased.
[0023]
It is a figure explaining the principle of the present invention, and a figure showing movement
when power is applied to a long rod-like object suspended by a thread. The figure which shows
the relationship between an excitation point and a node line. The figure which shows the
relationship between an excitation point and a node line. The figure which shows the relationship
between an excitation point and a node line. FIG. 1 shows an example of a small stereo speaker
according to the invention. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional
view of a small stereo speaker according to the invention. The figure which shows the structure
of the honeycomb panel which comprises a diaphragm. The figure which shows the example
which applied this invention to the screen speaker. The figure which shows the example which
mounted | worn the panel speaker single-piece | unit of this invention in the both sides of a large
sized flat display. The figure which shows the example which mounted | worn the panel speaker
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single-piece | unit of this invention in the both sides of a large sized flat display. The figure which
shows the example which mounted | wore the both sides of the elongate panel structurally and
mounted the speaker which reduced resonance to the both sides of a large flat display. The
characteristic view of the flat panel speaker of this invention. The figure which shows the
example which installed the panel speaker of this invention in the back of a liquid crystal
television and a plasma display. The figure which shows the example which applied the flat panel
speaker of this invention to radio / CD component stereo mounting. The figure which shows the
example which improved the stereo effect by combining two horizontal flat panel speakers by the
stereo speaker by this invention. Basic example of a conventional flat panel speaker. An example
of a conventional two channel stereo screen speaker projection system. The characteristic view of
the conventional speaker.
Explanation of sign
[0024]
Reference Signs List 10 flat panel speaker 11 diaphragm 12 exciter 13 frame 14 flexible material
20 screen projection system 30 projector 40 screen speaker 42 screen film 51, 52 flat panel
speaker 51a 52a diaphragm 51b 52b exciter 60 base 62 spring 100 stereo speaker
DESCRIPTION OF SYMBOLS 110 Decorative film 131a, 131b Exciter 150 Honeycomb panel 151
Honeycomb core material 152, 153 Surface material 154 Flexible edge material 160 Base panel
200 Screen speaker 210 Screen film 231a, b, c Exciter 232a, b, c Exciter 250 Honeycomb panel
260 Hanging String 310 Large flat display 312, 314 hinges 20, 330 speaker panel 410 large flat
display 412, 414 hinges 420, 430 flat panel speaker 420 diaphragm panel 500 LCD television
510 liquid crystal display panel 520 flat panel speaker 530 space 600 radio / CD component
stereo device 610 CD player 612 amplifier 614 Antenna 620 Flat panel speaker 630, 640 Sound
radiating part 700 Code 710 Left speaker part 712, 722 Excavator 720 Right speaker part 750,
760 Speaker panel
11-05-2019
13
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