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JP2007267302

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2007267302
A sound image at a central position can be localized at a central position as a function of a planar
stereophonic speaker. SOLUTION: A hollow diaphragm 4 equipped with left and right channel
exciters 5L and 5R and a center diaphragm 4C equipped with a center channel exciter 5C are
divided and disposed on the same plane. In this configuration, the exciter 5C vibrates the center
diaphragm 4C independent of the hollow diaphragm 4. The shock absorber frames 6, 6C are
disposed between the front exterior body 3 fixed to the main body and the diaphragms 4, 4C,
respectively, and the respective vibrations of the exciters 5L, 5R and the exciter 5C are generated
by the diaphragm 4 And the diaphragm 4C so as to avoid mutual interference. [Selected figure]
Figure 2
Structure of speaker for display and sound source image matching type display using the speaker
[0001]
The present invention relates to a sound source image matching display and a structure of a
display speaker formed by superposing a speaker diaphragm on a display panel. In particular, the
present invention relates to a structure of a display speaker which can easily realize a high sense
of presence by spatial correspondence correspondence between an image and a sound source.
[0002]
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1
2. Description of the Related Art Conventionally, with the development of display technology
using plasma, liquid crystal, and the like, planar enlargement of a display panel has been
promoted. Flat and large sized panels are required to be thin and have high quality. Furthermore,
the realization of high sense of presence by the spatial correspondence correspondence between
the video and the sound source is promoted. For example, Japanese Patent Application Laid-Open
No. 2002-533957 (Patent Document 1) discloses a sound source image matching type display
formed by superposing a diaphragm of a speaker on a display panel as a technique for achieving
matching between a video and a sound source. ing.
[0003]
Further, as a sound source image matching type display having a stereo speaker structure for the
purpose of high-class impression, for example, there is one disclosed in Japanese Patent
Application Laid-Open No. 2005-94377 (Patent Document 2). Patent Document 2 describes an
assembly structure of a speaker and an assembly method thereof from the display itself, but the
outline of the display structure can be understood as follows from the description.
[0004]
FIG. 1 is a diagram schematically showing the structure of a display understood from the
description of Patent Document 2. As shown in FIG. The display 101 has a screen display panel
102, a front side exterior body 103, and a diaphragm 104, and has a structure in which the
display panel 101 is sequentially superimposed and formed. The screen display board 102 is
incorporated in the rear side exterior body, and after being formed on the display 101, the
screen of the screen display board 102 can be viewed through the transparent portion of the
front side exterior body 103 and the diaphragm 104. The back side exterior body not shown also
has an audio signal generation unit. The sound reproduction is realized by forming the
diaphragm 104 into a flat wide-area speaker.
[0005]
An assembly structure of the diaphragm 104 as a flat wide-area speaker is described in detail in
Patent Document 2. That is, the diaphragm 104 is a sheet of thin transparent plate which makes
the periphery semi-transparent, is vibrated by the exciter 105 of the vibrator attached to the left
and right of the diaphragm, and a deflection corresponding to the vibration frequency is
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2
generated. Let The exciter 105 receives an audio signal corresponding to each of the left and
right channels from the audio signal generation unit. Therefore, the diaphragm 104 is formed on
a flat wide-area speaker having a stereo sound effect on the front surface.
[0006]
However, in recent years, the speaker function in display products is constantly adding value. For
example, in personal computers, the number of users seeking high sound quality is increasing
with the increase of products having a DVD function and a TV function for sound. On the other
hand, even in the product group where basic functions such as OS (Operating System) are
arranged side by side as a manufacturer side, the speaker structure, that is, the sound quality is
an important function and an element in differentiating from competitors. . Further, for example,
in the TV, the liquid crystal / plasma type has been increased in size, and acoustic performance
commensurate with high image quality and large screen has become necessary.
[0007]
That is, since such a panel speaker has a planar shape, there is a problem that the sound image
localization at the center position becomes ambiguous as long as the cone type speaker is not
heard at the ideal listening position. In particular, in the case of listening near the left channel or
the right channel, the sound image is not localized at the center position. Furthermore, as a
speaker function, in the case of a single-plate diaphragm, the vibrations of a plurality of sound
source exciters cross on the diaphragm, thereby deteriorating the separation of sound images
with respect to a plurality.
[0008]
JP-A-2002-533957 (refer to FIG. 5) JP-A-2005-94377 (refer to FIG. 1, FIG. 3 and FIG. 5)
[0009]
The problem to be solved is that the sound image at the central position is not localized at the
central position as a function of the planar stereophonic speaker.
[0010]
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The present invention is mainly characterized in that it has a center diaphragm separated from
the left and right channel diaphragms in order to localize the sound image at the center position
to the center position as a speaker function.
The details of the assembly structure are outside the scope of the present invention, and known
methods and structures can be applied.
[0011]
For this reason, the structure of the speaker for stereo type display according to the present
invention comprises a plurality of diaphragms in which exciters corresponding to a plurality of
channels are provided in a dispersed manner.
Then, the exciter provided on the first diaphragm of the diaphragms is for the center channel
which is the combination of the sound sources of the remaining channels. Therefore, a
diaphragm of an appropriate shape can be provided for each exciter of each channel.
[0012]
The display is generally in the form of a flat panel. The left and right channel exciters for the
sound image vibrate the diaphragm on the same plane on the left and right of the display image
of the display. It is desirable that the other center channel exciter be on the center line where the
left and right channel exciters are in symmetrical positions. However, the left and right channel
diaphragms and the center channel diaphragm need not be on the same plane. With such a
configuration, since the center channel diaphragm can be made independent of the left and right
channel diaphragms, the sound image of the center channel is clarified at the center position.
[0013]
Among the diaphragms, the left and right channel diaphragms are used as a second diaphragm.
The second diaphragm can be a single transparent panel equipped with left and right channel
exciters on the left and right sides, respectively, so that the display image can be transmitted.
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[0014]
Furthermore, at least the left and right sound image separation can be improved as a speaker
function.
[0015]
One of them is to use the second diaphragm as a hollow diaphragm.
The hollow diaphragm is equipped with left and right channel exciters on the left and right sides
of the diaphragm so that the display image can be transmitted at the central portion, and the
central portion has a hollow opening that transmits the display image. . Such hollow shapes
effectively improve the sound image separation of the left and right channels.
[0016]
Another one is that the third and fourth diaphragms are replaced with the second diaphragm in
addition to the first diaphragm among the diaphragms. The third and fourth diaphragms are
equipped with exciters for the left and right channels, respectively, and are provided at an almost
equal distance from the display image transmission area so that the display image can be
transmitted at the central portion. In this case, since the sound image of the speaker is
completely separated to the left and right by the two separated diaphragms, the sound image
separation of the left and right channels is significantly improved.
[0017]
Furthermore, each of the third and fourth diaphragms may be a cone box speaker. That is, the
cone-shaped box speakers having the left and right channel exciters are provided on the left and
right sides of the display image transmission area at substantially equal distances so that the
display image can be transmitted at the central portion. With this configuration, the
characteristics of the cone-type speaker can be exhibited.
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[0018]
In the configuration of the diaphragm described above, since the first diaphragm that is the
diaphragm for the center channel and the remaining diaphragms are separated, it is not
necessary to arrange all the diaphragms on the same plane. Therefore, the first diaphragm may
be provided to position the center channel exciter on the center line so that the viewer can view
the display image from the front. In addition, a diaphragm or a box speaker may be provided so
that the left and right channel exciters may be disposed on the left and right. They are close to
each other, so if they are on approximately the same plane, their sense of realism will be the best.
[0019]
Therefore, the sound source image matching type display is formed such that one of the abovedescribed stereo display speakers is in close contact with the front side of the exterior body, and
the image display module is in close contact with the rear side.
[0020]
The structure of the display speaker according to the present invention and the sound source
image matching type display using the speaker are provided with the center channel diaphragm
having the center channel exciter separated from the diaphragm having the left and right
channel exciters. There is.
Therefore, since the sound image in the center channel is output separately from the sound
images in the left and right channels, it has an advantage of being clarified at the center position.
[0021]
The purpose of allowing the sound image at the center position to be localized at the center
position as the speaker function is realized by providing the center channel diaphragm separated
from the left and right channel diaphragms for voice.
[0022]
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Hereinafter, a plurality of embodiments will be described with reference to the drawings.
Among the components in the following embodiments, combinable components may be
combined. Although the component parts according to the present invention are clearly shown in
the drawings, other essential components may be omitted. Further, in the drawings, there are
also portions that are exaggerated to aid the understanding of the configuration, and the relative
dimensions compared with each other differ from the actual relative dimensions.
[0023]
A first embodiment of the present invention will be described with reference to FIGS. 2 to 5
together.
[0024]
FIG. 2 is a perspective view showing an embodiment of the display panel 1 in the present
invention in an exploded structure.
The display panel has a flat plate shape as the name suggests. FIG. 3 is a front view in the case
where each component in FIG. 2 is assembled. FIG. 4 is a view showing an AA cross section of
FIG. The details of the assembly structure may be based on, for example, Patent Document 2
described above, but any other structure may be used as long as the function of the present
invention is satisfied.
[0025]
The display panel 1 is shown in FIG. 4 as the display module 2, the front exterior body 3, the
hollow diaphragm 4 and the center diaphragm 4C, and the cushioning frame 6 for the hollow
diaphragm and the cushioning frame 6C for the center diaphragm. It is formed by overlapping.
Therefore, each except shock absorbing material frames 6 and 6C has a thin plate shape. In
addition, the display panel 1 includes the left channel exciter 5L, the right channel exciter 5R,
and the center channel exciter 5C to vibrate the diaphragms 4 and 4C.
[0026]
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The display module 2 is a screen display board made of liquid crystal, plasma or the like. The
front exterior body 3 is provided with a center opening 3H at the center of the screen display
area of the display module 2, and is fixedly supported by the apparatus main body. The left
channel exciter 5L and the right channel exciter 5R are fixed to the left and right of the hollow
opening 3H via the buffer material, and the center channel via the buffer below the hollow
opening 3H. The exciter 5C is fixed.
[0027]
The hollow-out diaphragm 4 has the same horizontal dimension as the front exterior body 3 and
has a hollow-out opening 4H for the screen display area of the display module 2 at the center.
The hollow extraction diaphragm 4 is fixed by the buffer material frame 6 with the position of
the hollow opening 3H aligned with the front exterior body 3. The center diaphragm 4C has the
same dimension as the lateral dimension of the hollow diaphragm 4, is disposed with a small gap
at the lower side of the hollow diaphragm 4, and is fixed to the front exterior body 3 by the
buffer material frame 6C. . That is, the two diaphragms constituted by the hollow-out diaphragm
4 and the center diaphragm 4C are disposed adjacent to each other on the same plane, and have
the same external dimensions as the front exterior body 3.
[0028]
The left channel exciter 5 </ b> L is fixed to the left side wall surface of the center opening 3 H of
the front exterior body 3 via a shock absorbing material, while its drive coil is bonded to the
center opening diaphragm 4. Therefore, by the piston movement of the drive coil, the left side
wall of the blowout diaphragm 4 vibrates to create the sound pressure of the left channel sound
image. The right channel exciter 5R is also similar, and vibrates the right side wall of the hollow
diaphragm 4 to create the sound pressure of the right channel sound image. Similarly, the center
channel exciter 5C vibrates the center diaphragm 4C by the piston movement of its drive coil to
create the sound pressure of the center sound image.
[0029]
The cushioning material frame 6 for hollow punching diaphragm is, for example, a foam cushion,
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and when fixing the hollow punching diaphragm 4 to the front exterior body 3, it is used for
vibration assistance near the outer periphery thereof. The shock absorbing material frame 6C for
center diaphragm is, for example, a foam cushion, and is used for assisting vibration around the
outer periphery when the center diaphragm 4C is fixed to the front exterior body 3.
[0030]
As a result, as shown in FIG. 4, the respective components are overlapped, and as shown in FIG.
3, the hollow diaphragm 4 and the center diaphragm 4C become the front surface, and the
speaker function is exhibited by the vibration. In the center opening 4H, the screen of the display
screen area of the display module 2 at the rear end can be seen.
[0031]
Next, with reference to FIG. 5, reproduction of a stereo sound image in the present embodiment
will be described.
[0032]
FIG. 5 is a diagram showing a circuit configuration for exciting the left channel exciter 5L, the
right channel exciter 5R, and the center channel exciter 5C described above.
The circuit drives the exciters 5L, 5R, 5C by the stereo sound source 11, the stereo amplifier
(amplifier) 12, the center amplifier 13 and the filter 14 for center.
[0033]
As illustrated, the stereo sound source 11 supplies the left channel sound source and the right
channel sound source to the stereo amplifier 12 and the center amplifier 13 respectively.
The stereo amplifier 12 amplifies each of the received sound sources and supplies the left
channel sound source to the left channel exciter 5L and the right channel sound source to the
right channel exciter 5R. With such a configuration, the center-opening diaphragm 4 vibrates in
response to the vibrations of the exciters 5L and 5R, and the reproduction of a stereo sound
image is realized.
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[0034]
The center amplifier 13 amplifies and mixes the received respective sound sources, and supplies
the “left + right” channel sound source mixed through the center filter 14 to the center
channel exciter 5C. The center filter 14 has, for example, a band pass function of blocking low
and high frequency bands, and can narrow down the reproduced sound from the center channel
to the mid band, that is, the frequency band of human voice. With such a configuration, the
center diaphragm 4C can sufficiently exhibit the effect of the center channel addition without
deteriorating the separation of the left / right channels. As a result, it is possible to obtain an
effect that the sound image to be localized in the center can be heard from the center regardless
of the position where it is heard. Although the center filter has the voice band pass function in
the above description, it may be another function such as a low pass function.
[0035]
As described above, since the flat shape speaker according to the present invention adopts a
configuration in which the diaphragm for the center channel sound image and the diaphragm for
stereo sound image reproduction by the left / right channel are divided, the following effects can
be obtained. can get.
[0036]
First, in the planar speaker, the holding condition of the diaphragm, for example, the hardness of
the foam cushion, is an important factor that greatly affects the acoustic characteristics.
In the present invention, since the portion for the center channel is a separate diaphragm, the
holding degree can be freely set by each diaphragm, and the width of the acoustic adjustment is
greatly expanded. Further, since the diaphragm divided structure is not affected by both
vibrations, it is possible to easily obtain the intended effect when, for example, sound having
different characteristics is reproduced in each channel. That is, by providing a diaphragm for
each exciter for the sound of each channel extracted from the stereo sound source, it is possible
to easily and surely reproduce a sound image having different characteristics in each channel.
[0037]
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10
Second, the degree of freedom in design is expanded, and more commercial designs can be made.
For example, although it is possible to make a design in which the hollow diaphragm and the
center diaphragm have an angular difference in design, the acoustic effect in each channel is not
impaired. Furthermore, since the mounting of the diaphragm can be set arbitrarily, designability
and acoustic performance can be compatible at a high level.
[0038]
Next, a display panel 21 according to a second embodiment of the present invention will be
described with reference to FIG.
[0039]
In this embodiment, only the hollowing diaphragm 4 in FIG.
Such a configuration enables, for example, a design having a sense of transparency in which the
screen periphery is configured in one plane on the front surface of the device. It is also effective
for designs that emphasize the sense of unity between audio and video.
[0040]
Also in this embodiment, since the planar speaker has a configuration in which the diaphragm for
the center channel and the diaphragm for stereo sound image reproduction by the left / right
channel are divided, the same effect as the above embodiment can be obtained. .
[0041]
Next, a display panel 31 according to a third embodiment of the present invention will be
described with reference to FIG.
[0042]
The diaphragm in this embodiment is configured to be divided into a left channel diaphragm 32L
and a right channel diaphragm 32R, except for the left and right columnar portions of the
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hollowed diaphragm 4 in FIG.
According to this division, the buffer material frame 6 is also divided into a left channel buffer
material frame 33L and a right channel buffer material frame 33R.
Such a configuration can reduce the cost of the diaphragm. Furthermore, this is effective when
emphasizing the separation of the left and right channels.
[0043]
In this embodiment, since the diaphragm separated for the center channel is further divided into
the left and right channels in the above embodiment, in addition to the same effects as in the
above embodiment, the left / right of the stereo sound image It is effective when emphasizing
channel separation.
[0044]
Next, a display panel 41 according to a fourth embodiment of the present invention will be
described with reference to FIG.
[0045]
This embodiment is different from the left and right channel diaphragms 32L, 32R, the left and
right channel buffer material frames 33L, 33R, and the left and right channel exciters 5L, 5R in
FIG. A speaker 45R is provided.
That is, each of the box speakers 45L and 45R integrally includes the diaphragms 32L and 32R,
the buffer material frames 33L and 33R, and the exciters 5L and 5R, and these components.
Further, the front exterior body 3 is divided into the left and right channel exterior bodies 42 and
the center channel exterior body 42C.
[0046]
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The illustrated box speakers 45L, 45R are provided on the rear surface side of the left and right
channel exterior body 42, and the vibration of the internal diaphragm is sent out as a sound
image on the front surface. In this case, slit openings etc. are provided on the left and right walls
of the left and right channel exterior body 42 equipped with the box speakers 45L, 45R, and the
sound is discharged to the outside on the front.
[0047]
The center channel outer package 42C fixes the center channel exciter 45C to the central portion
via a buffer material. The center channel exciter 45C has the same configuration as the center
channel exciter 5C in FIG. 2 and is assembled with the center diaphragm 4C. Further, the center
diaphragm 4C is fixed to the center channel exterior body 42C by the buffer material frame 6C.
Therefore, the center channel exciter 5C vibrates the center diaphragm 4C by the piston
movement of its drive coil to create the sound pressure of the center sound image.
[0048]
With such a configuration, the sound image of the center channel is similar to that of the other
embodiments, but the stereo sound image characteristic of the left and right channels has a cone
box speaker characteristic. Therefore, this configuration is effective when a cone type speaker
characteristic is required.
[0049]
By dividing the diaphragm driven by the exciter for the center channel of the flat speaker and the
diaphragm driven by the exciter for the other channel and driving each exciter, the center
channel can be operated independently of the other channels. Since the sound image can be set
at the center position, it is possible to use, for example, a display screen with an audio
reproduction function in an information device, a portable terminal device, etc., as well as a
screen display unit integrated type speaker in an acoustic image system Are also applicable to
[0050]
It is the perspective view which decomposed | disassembled and showed an example of the
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structure of the conventional display speaker.
It is the perspective view which disassembled and showed one Embodiment of the structure of
the speaker for displays by this invention. (Embodiment 1) FIG. 5 is a front view showing one
aspect when assembling the components of the display speaker in FIG. 2 from the front.
(Example 1) FIG. 4 is a cross-sectional view taken along the line A-A in which the display speaker
in FIG. (Embodiment 1) FIG. 1 is a block diagram showing an embodiment of a drive circuit
configuration in a speaker for a display according to the present invention. (Common to
Examples) FIG. 6 is an exploded perspective view showing an embodiment of the structure of the
display speaker according to the present invention. (Embodiment 2) FIG. 6 is an exploded
perspective view showing an embodiment of the structure of a display speaker according to the
present invention. (Embodiment 3) FIG. 6 is an exploded perspective view showing an
embodiment of the structure of a display speaker according to the present invention. (Example 4)
Explanation of sign
[0051]
1, 21, 31, 41 display panel 2 display module 3 front exterior 3H, 4H hollow opening 4 hollow
diaphragm 4C center diaphragm 5C, 45C center channel exciter (exciter) 5L left channel exciter
(exciter) 5R Right channel exciter (exciter) 6 Shock absorber frame for hollow diaphragm (shock
absorber frame) 6 C shock absorber frame for center diaphragm (shock absorber frame) 11
stereo sound source 12 stereo amplifier 13 center amplifier 14 filter for center 22 transparent
Panel 32L Left channel diaphragm (diaphragm) 32R Right channel diaphragm (diaphragm) 33L
Left channel shock absorber frame (shock absorber frame) 33R right channel shock absorber
frame (shock absorber frame) 42 Exterior cover for left and right channels Body (Exterior body)
42C Center channel For exterior body (exterior body) 45L left cone type box speaker (box
speaker) 45R right cone type box speaker (box speaker)
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