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JP2005117217

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DESCRIPTION JP2005117217
PROBLEM TO BE SOLVED: To provide a panel speaker which has a simple configuration, is thin,
prevents a cost increase, and has a good sound quality. SOLUTION: A diaphragm 2 is constituted
by a flat plate-like transparent body. A frame-like frame 1 heavier than the diaphragm 2 is
disposed on the outer periphery of the diaphragm 2, a hollow portion 7 functioning as a back
cavity is formed in the frame 1, and the vibration frame outer peripheral portion 2a is formed in
the hollow portion 7. It is supported by the edge 17 and driven by the driver 8. The driver 8 is
disposed at such a position as to pass through at least one vibration node of the order and form
at least one line symmetrical arrangement with respect to the vibration node of the diaphragm 2.
[Selected figure] Figure 4
パネルスピーカ
[0001]
The present invention relates to a flat panel speaker which is a kind of acoustic equipment.
[0002]
As panel type speakers, there are, for example, JP-A-2003-153361, JP-A-2002-176685, JP-A2002-530902, and JP-A-2001-61194.
[0003]
In these panel-type speakers, a flat diaphragm is placed in a horizontally long rectangular framelike frame, and a printed sheet is attached to the diaphragm or an image or other visual
information is displayed. It is composed of
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[0004]
Although these panel-type speakers have the advantage of adding visual information display
functions in addition to the audio information transmission function that is the original speaker
function, since the diaphragm is not transparent, it is possible to look behind the speakers
Instead, it can not be used, for example, by arranging it on the front of a device such as a PDP
and viewing an image from the front of the speaker.
[0005]
Recently, various video equipments have become widespread, and while it is desirable for
speakers to correspond to various usage forms combined with these, various specifications and
design according to the installation environment are also required. .
[0006]
If the diaphragm itself of the panel speaker is made transparent, the degree of freedom of
installation can be improved in response to these requirements, and an effect as an interior with
excellent design can be expected.
[0007]
In addition to diversification of usage due to the transparency of the diaphragm, it is expected
that both small size and thin type can be compatible with excellent sound reproduction, and
further, it can be manufactured at low cost.
[0008]
JP-A-62-73898, JP-A-11-288040, JP-A-2002-252895 etc. exist as what made the diaphragm of
the panel type speaker transparent.
JP 2003-153361 JP 2002-176685 JP 2002-530902 JP JP 2001-61194 JP JP 62-73898 JP 11288040 JP 2002-252895
[0009]
The speaker in Japanese Patent Application Laid-Open No. 62-73898 is disposed on the front of
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a television receiver or can be attached to a window glass as a speaker for a car stereo, but holds
a diaphragm in a curved shape via an edge, In addition, since the end of the diaphragm is driven
in a direction substantially parallel to the surface of the diaphragm, the speaker has a large
thickness, which limits the reduction in weight and size.
[0010]
Moreover, although the diaphragm of a speaker is transparent, since a video irradiator is
combined with a speaker, Unexamined-Japanese-Patent No. 11-288040 enlarges a speaker
apparatus, Moreover, while becoming expensive, a speaker becomes a transparent substrate
Since a transparent piezoelectric material, a transparent hologram element, and the like are
laminated, there is a problem that the thickness of the vibrator is increased and the weight is
increased, and this part also causes an increase in cost.
[0011]
In addition, in Japanese Patent Application Laid-Open No. 2002-252895, since the entire back
surface of the diaphragm is open and the diaphragm is supported by the partially provided edge,
there is a problem that good acoustic reproduction can not be performed. there were.
[0012]
The present invention has been proposed in view of the above, and the object of the present
invention is to make the diaphragm transparent and visible, thereby increasing the degree of
freedom of use, and making it small, thin and favorable. An object of the present invention is to
provide a panel speaker capable of reproducing sound at low cost with a simple configuration.
[0013]
The invention according to claim 1 comprises a flat plate-like transparent diaphragm 2 and a
frame-like frame 1 provided around the diaphragm 2 and made of a material having a weight
greater than at least the diaphragm 2. The frame 1 has a substantially sealed hollow portion 7 in
which a driver 8 for driving the diaphragm and a frame-like edge 17 are provided, and in the
hollow portion 7 the outer peripheral portion of the diaphragm 2 2a is disposed, connected to
the driver 8, and substantially the entire periphery of the outer peripheral portion 2a is fixed to
the edge 17, and the diaphragm 2 is supported via the edge 17, Is achieved.
[0014]
According to a second aspect of the present invention, in the first aspect, the driver 8 passes at
least one vibration node of the order and forms at least one line symmetrical arrangement with
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respect to the vibration node of the diaphragm 2. It is characterized in that it is disposed at such
a position.
[0015]
According to the first aspect of the present invention, a substantially sealed hollow portion in
which the flat plate-like transparent diaphragm 2 is provided on the frame-like frame 1 and the
outer peripheral portion 2a of the diaphragm 2 is provided on the frame 1 7 and driven by the
driver 8 provided in the hollow portion 7. Since the diaphragm 2 has a flat plate shape, the
thickness of the panel speaker can be reduced, achieving downsizing and weight reduction.
Because the diaphragm 2 is transparent and visible, the degree of freedom of arrangement is
improved and the interior is good, and it can be used in combination with other video equipment
such as TV, etc. It can respond to the diversification of
[0016]
In addition, the hollow portion 7 functions as a back cavity, and further, almost the entire area of
the outer peripheral portion 2a of the diaphragm 2 is fixed to the frame-like edge 17 and
attached to the frame via the edge 17 The regeneration has been achieved.
Also, since the frame 1 is made of a material that is heavier than the diaphragm 2, even if the
diaphragm is relatively heavy and the reaction at the time of vibration is large, the influence of
this reaction is prevented and stable sound reproduction is realized. can do.
[0017]
According to the second aspect of the present invention, the driver 8 is provided at the position
of the vibration node of at least one order with respect to the vibration node of the diaphragm 2,
so that the diaphragm can be driven efficiently. By providing at least one line symmetrical
position, good frequency characteristics can be obtained.
[0018]
Hereinafter, embodiments of the present invention will be described with reference to the
drawings.
[0019]
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Embodiment 1 FIG. 1 (a) is a front view of an embodiment of the present invention, FIG. 1 (b) is a
sectional view taken along the line A-A, and FIG. 2 is an enlarged view of a portion A in FIG. 3 is a
schematic internal structural view of the driver used in the present invention, FIG. 4 is a front
view with the front frame and the diaphragm removed from the state of FIG. 1, and FIG. 5 is a
frequency characteristic view.
[0020]
First, in FIG. 1, 1 is a frame, 2 is a flat plate-like diaphragm made of a transparent material.
[0021]
The frame 1 has a frame shape, and as a material, for example, a material having a weight
greater than the weight of at least the diaphragm 2 such as an aluminum material is used.
[0022]
The frame 1 has a frame-like rectangular shape when viewed from the front, and the inner
portion is a large window, and is combined with the rear frame 3 having the hollow portion 7 for
installing the driver 8 and the hollow portion 7 The front frame 6 is constructed.
Although the frame shape of the present embodiment is rectangular, it is not necessarily limited
to the rectangular.
[0023]
The diaphragm 2 has a shape substantially corresponding to the frame shape, and its size is
slightly smaller than that of the frame 1, and it is preferable to use, for example, a transparent
flat plate-like acrylic plate having a thickness of 0.9 mm. In addition, a plastic material such as
polycarbonate or glass may be used.
[0024]
As shown in FIG. 1 (b) and FIG. 2, the rear frame 3 of the frame 1 has an outer skin 4 and an
inner inner plate 5, and the front frame 6 is combined on the front side. A substantially sealed
hollow portion 7 is formed inside.
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[0025]
The hollow portion 7 is provided with a driver 8 for driving the diaphragm 2 and an edge 17
made of, for example, foam rubber for supporting the outer peripheral portion 2a of the
diaphragm 2, and the hollow portion 7 has an acoustic effect. Act as a back cavity for
[0026]
As shown in FIG. 3, the driver 8 includes a cup-shaped yoke 9 and a frame 10 whose outer shape
is larger than this. As shown in FIG. 2, the end 9a of the yoke 9 is an inner wall surface of the
back frame 3. The upper and lower portions of the outer peripheral surface of the frame 10 are
held by the outer plate 4 and the inner plate 5 directly or indirectly via a space.
Therefore, the driver 8 is not seen from the outside by the outer plate 4 and the inner plate 5,
and the appearance is good.
[0027]
A gap 11 is formed between the front end 5a of the inner plate 5 and the front frame 6, and the
outer peripheral portion 2a of the diaphragm 2 is introduced into the hollow portion 7 through
the gap 11 to obtain the diaphragm The front side of the outer periphery of 2 is vibratably
supported by an edge 17.
[0028]
The edge 17 whose base end 17 a is fixed to the inside of the outer plate 4 has a frame shape,
and is configured to support the entire back surface of the outer peripheral portion of the
diaphragm 2.
[0029]
Further, the back surface of the outer peripheral portion of the diaphragm 2 is coupled to the
vibrator 12 of the driver 8.
[0030]
As an example of the internal structure of the driver 8, as shown in FIG. 3, it has a cup-shaped
yoke 9, and a short cylindrical magnet 13 is provided inside this yoke 9, and the end face of this
magnet 13 is a circle A plate-like pole piece 14 is provided, and a magnetic gap 15 is formed
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between the outer peripheral surface of the pole piece 14 and the opening of the yoke 9, a
magnetic circuit is formed by these, and the magnetic gap 15 comprises a voice coil. One end of
the body 12 is disposed, and the other end of the vibrating body 12 is connected to the front
surface of the outer peripheral portion 2 a of the diaphragm 2.
[0031]
The vibrating body 12 is supported by a damper 16 provided at an opening in the frame 10.
[0032]
As shown in FIG. 2, a space is provided on the front side of the edge 17 supporting the
diaphragm 2 so as not to inhibit the vibration of the edge 17, and the front side of the diaphragm
2 and the front frame 6 There is also a space between them.
[0033]
FIG. 4 is a front view showing the internal structure of the frame 1 from which the front frame 6
and the diaphragm 2 are removed. As can be seen from this figure, the planar shape of the driver
8 is formed into a horizontally long track shape. A track-shaped vibrating body 2 is provided on a
substantially central portion on the short side of the and is connected to the back surface of the
diaphragm outer peripheral portion 2a.
[0034]
The driver 8 is disposed at such a position as to form at least one line-symmetrical arrangement
in the form of a flat plate.
[0035]
In operation, by applying an audio signal to each driver 8, the diaphragm 12 vibrates
accordingly, and the vibration is transmitted to the flat plate-shaped diaphragm 2.
[0036]
At this time, the substantially closed hollow portion 7 in the frame 1 functions as a back cavity to
obtain good frequency characteristics, and in this case, from the back surface near the edge 17 to
which the diaphragm 2 is connected to the front side It is possible to prevent the sound from
coming around and causing interference between the front and back sounds and causing
deterioration of the sound, and good sound reproduction can be realized.
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[0037]
FIG. 5 shows a frequency characteristic diagram of the present invention.
[0038]
Further, although the illustrated example shows an example in which the panel speakers are
arranged in a vertical manner, it goes without saying that the panel speakers can be arranged in
a horizontal manner for use.
[0039]
In this case, stereo reproduction can be performed by inputting the left channel signal of the
stereo signal to the driver 8 on the left side and the right channel signal to the driver 8 on the
right side.
[0040]
Second Embodiment FIG. 6 shows another embodiment of the present invention.
[0041]
In this embodiment, two drivers 8 are provided on each of the long sides of the back frame 3. In
the first embodiment, one driver 8 is disposed on each of the short sides and parallel to the short
sides. While the arrangement is symmetrical with respect to the substantially central line, the
arrangement is symmetrical with respect to both of the central line parallel to the short side and
the central line parallel to the long side.
[0042]
The other configuration is almost the same as the above embodiment.
[0043]
Although a horizontal panel speaker is shown in the illustrated example, it is a matter of course
that this may be used as a vertical type.
[0044]
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(A) is a front view of 1st Example of this invention, (b) shows the sectional view on the AA line in
(a) figure.
The expanded sectional view of the A section in Drawing 1 (b).
1 shows an exemplary configuration of a driver used in the present invention.
The front view which shows arrangement of the driver in the frame of the panel speaker of 1st
Example of this invention.
The frequency characteristic figure of 1st Example of this invention is shown.
The front view which shows the internal structure of 2nd Example of this invention is shown.
Explanation of sign
[0045]
Reference Signs List 1 frame 2 flat plate diaphragm 2a diaphragm outer peripheral portion 3
back frame 3c recess 4 outer plate 5 inner plate 5 a inner plate end 6 front frame 7 hollow
portion 8 driver 9 yoke 9 a yoke end 10 frame 11 air gap 12 vibrator 13 magnet 14 pole piece
15 magnetic cap 16 damper 17 edge 17 a edge base
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