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JP2005192119

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DESCRIPTION JP2005192119
The present invention provides a sound reproducing apparatus capable of improving sound
pressure even with a small panel. A panel (2) is elastically supported on a base (4) via a damper
(3). The panel 2 has a rectangular shape, and the vibration generating means 5 is provided at one
end of the long side of the panel 2 and the fixing member 6 is provided at the other end. The
vibration generating means 5 has an elongated excitation member, and both ends of the
excitation member are fixed to the panel 2. The excitation member is provided with a magnet,
and the panel 2 is provided with a coil. When the coil is energized, the panel 2 can improve the
sound pressure in a wide band with the vibrator having the excitation reference line O as a node.
[Selected figure] Figure 1
Sound reproduction device
[0001]
The present invention relates to a sound reproducing apparatus that vibrates a sound generation
panel such as a transparent panel of a display unit to generate sound, and more particularly to a
sound reproducing apparatus capable of improving sound pressure.
[0002]
An example of a panel-type sound reproduction apparatus that vibrates a panel to generate
sound is described in, for example, Patent Document 1 below.
[0003]
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According to Patent Document 1, a transparent panel is fixed to an opening formed in a case of a
mobile phone, a liquid crystal display element is provided inside the panel, and an image
displayed on the liquid crystal display element through the panel is displayed. It is made visible.
Furthermore, a piezoelectric vibrating element is fixed at a position not overlapping the liquid
crystal display element inside the panel, and the piezoelectric vibrating element is vibrated by
applying a voltage, and this vibration is transmitted to the panel and the panel is To pronounce.
Unexamined-Japanese-Patent No. 2002-232542
[0004]
However, in a relatively small device such as a mobile phone as shown in Patent Document 1
described above, the panel mounted thereon becomes small, and as a result, the vibration area of
the panel becomes small, making it difficult to output with high sound pressure. Become.
[0005]
Moreover, in the thing of the said patent document 1, reducing the resonant frequency of a panel
and suppressing a high frequency zone is proposed by forming space between a panel and a
piezoelectric vibration element.
However, if the output on the high-pitched sound side is suppressed too much, the sound quality
may deteriorate.
[0006]
The present invention is to solve the above-mentioned conventional problems, and it is an object
of the present invention to provide an acoustic reproduction device capable of improving the
sound pressure over a wide frequency band without losing the sound quality.
[0007]
According to the present invention, in a sound reproducing apparatus provided with a sound
generation panel elastically supported on a base and vibration generating means for giving a
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vibration to the sound generation panel, a part of the sound generation panel elastically
supported is It is characterized in that it is directly or indirectly fixed to and fixed to the base.
[0008]
In this sound reproducing apparatus, since the sound generation panel is restrained except at the
place where the vibration generation means is provided, a line connecting the vibration
generation means and the fixed portion where the sound generation panel is restrained becomes
a node. The sounding panel vibrates with a large amplitude.
[0009]
For example, the vibration generating means includes driving means provided between an
elongated excitation member whose both ends are connected to the sound generation panel and
the sound generation panel at a central portion thereof, the drive The fixed portion between the
base and the sound generation panel is located on an excitation reference line extending through
the means and in a direction orthogonal to the longitudinal direction of the excitation member.
[0010]
With this configuration, vibration is applied to the connection between the excitation member
and the sound generation panel on both sides of the excitation reference line, so that the sound
generation panel acts with the vibration reference line as a node. .
[0011]
In this case, the sound generation panel may be rectangular, and the driving means and the fixing
portion may be disposed at the central portion of the long side inside the long side facing each
other.
[0012]
Alternatively, the sound generation panel has a longitudinal shape whose longitudinal dimension
is longer than that of the lateral direction, and the drive means and the fixing portion are
disposed with a space in the lateral direction at a central portion which divides the longitudinal
direction into two. Can be configured as
[0013]
Further, according to the present invention, the vibration generating means includes driving
means provided between an elongated excitation member whose both ends are connected to the
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sound generation panel, and the sound generation panel at a central portion thereof. The fixed
portions of the base and the sound generation panel are positioned on both sides of an excitation
reference line extending through the driving means and in a direction orthogonal to the
longitudinal direction of the excitation member. It is also good.
[0014]
In this case, a node of vibration is formed on a line connecting the driving means and one fixing
portion and a line connecting the driving means and the other fixing portion, so that the sound
generation panel can be effectively vibrated.
[0015]
The present invention can improve the sound pressure over a wide frequency band without
impairing the sound quality even when installed in a small device.
[0016]
1 is a plan view showing a sound reproducing apparatus according to a first embodiment of the
present invention, FIG. 2 is a view taken in the direction of arrow 2 in FIG. 1, FIG. 3 is a sectional
view taken along line 3-3 in FIG. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG.
[0017]
As shown in FIGS. 1 and 2, this sound reproducing apparatus 1 has a transparent panel 2 as a
sound generation panel, and the damper 3 has long and short sides of the panel 2 made of an
elastic material such as synthetic rubber. Is elastically supported on the base 4.
The panel 2 is formed in a rectangular shape by a plate of a synthetic resin such as
polycarbonate, acrylic, or PET (polyethylene terephthalate).
The base 4 is made of synthetic resin or metal, and has a size slightly larger than that of the
panel 2.
The base 4 may be a housing of an electronic device such as a mobile phone.
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One surface side of the damper 3 is fixed to the outer peripheral edge of the panel 2, and the
other surface side is fixed on the base 3.
[0018]
As shown in FIGS. 1 and 2, vibration generating means 5 and a fixing member 6 are provided on
the inner side of the panel 2 at intervals.
[0019]
As shown in FIG. 4, the vibration generating means 5 has an elongated (long) excitation member
7 whose dimension in the X direction is sufficiently longer than that in the Y direction.
The excitation member 7 is formed of a magnetic material such as a steel plate, and connecting
portions 7a and 7a bent in an L shape are formed at both ends in the X direction, and the
connecting portions 7a and 7a are panels 2 It is fixed inside with an adhesive.
Although not shown, bent portions may be formed on both sides of the excitation member 7
extending in the X direction so as not to hit the panel 2.
[0020]
A magnet 8 formed of a permanent magnet such as ferrite or rare earth is fixed to the bottom 7b
of the excitation member 7 facing the panel 2, and a yoke 9 formed of a magnetic material is
further formed on the top of the magnet 8 ing.
The upper surface of the yoke 9 is set so as not to hit the panel 2 when the magnet 8 and the
yoke 9 are stacked on the bottom 7 b.
[0021]
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On the other hand, the panel 2 is provided with a coil 10 on the side facing the excitation
member 7.
The coil 10 is formed by winding a coated copper wire or the like in a coil shape, and when the
excitation member 7 is fixed to the panel 2, the magnet 8 and the yoke 9 are of the coil 10. It is
inserted in the state which formed the gap G of the micro space | interval in the inside.
[0022]
For example, in the magnet 8, when the Z1 side is magnetized to the N pole and the Z2 side is
magnetized to the S pole, magnetic field generating means for applying a magnetic field to the
coil 10 by the magnet 8, yoke 9, gap G and excitation member 7 Is formed.
When the bent portion is formed in the excitation member 7, the current path extending in the X
direction of the coil 10 is positioned between the magnet 8 and the yoke 9 and the bent portion.
The bent portion can function as an opposing yoke.
[0023]
When the coil 10 is energized, the panel 2 and the excitation member 7 are deformed in a
direction in which the panel 2 and the excitation member 7 come close to each other and in a
direction away from each other based on Fleming's left hand law.
In this embodiment, the magnetic field generating means and the coil 10 constitute a magnetic
driving means.
[0024]
As shown in FIG. 4, the excitation member 7 is connected to the panel 2 via the connecting
portions 7a and 7a at both ends in the longitudinal direction, and the magnetic driving means is
provided at the central portion of the connecting portions 7a and 7a. ing.
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Therefore, due to the driving force of the magnetic drive means, a vibration is generated between
the excitation member 7 and the panel 2 between the connecting portion 7a and the connecting
portion 7a, and this vibration is transmitted to the panel 2 from the connecting portions 7a and
7a. Given.
[0025]
As shown in FIG. 1, let a virtual line extending in a direction perpendicular to the longitudinal
direction of the excitation member 7 be an excitation reference line O, passing through the
magnetic drive means, that is, passing through the central portion bisecting the excitation
member 7 in the longitudinal direction. The fixing member 6 is located on the excitation
reference line O.
The panel 2 has a rectangular shape, and the excitation reference line O is located at a position
dividing the long side of the panel 2 into two. Therefore, in this embodiment, the excitation
reference line O is a node of vibration of the panel 2.
[0026]
In the vibration generating means 5, as driving means for generating vibration between the
excitation member 7 and the panel 2, not only the magnetic driving means but also the excitation
member 7 and the panel 2 directly or indirectly via other members. It may be a piezoelectric
element fixed to
[0027]
FIG. 7 is a cross-sectional view showing a modification of the vibration generating means shown
in FIG.
In this vibration generating means 5A, a coil 10 is provided on a sheet 11 made of synthetic resin
such as PET or polycarbonate, and this sheet 11 is adhered and fixed to the panel 2. The
connecting portions 7 a and 7 a of the excitation member 7 are fixed to the sheet 11, and the
excitation member 7 is connected to the inside of the panel 2 via the sheet 11. In this
embodiment, since the coil 10 may be formed on the surface of the sheet 11, the coil 10 can be
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easily formed. Further, the coil 10 is formed on the sheet 11, the excitation member 7 is adhered
and fixed to the sheet 11, and then the sheet 11 is adhered to the panel 2, whereby the
manufacturing process can be simplified.
[0028]
In the sound reproducing apparatus 1 shown in FIG. 1, as shown in FIG. 3, a rectangular opening
4a is formed in the base 4, and a liquid crystal display element, for example, the vibration
generating means 5 and the back side of this opening 4a. By arranging so as not to overlap the
fixing member 6, an image or an image outputted from the liquid crystal display element can be
visually recognized through the panel 2. Thus, sound generation from the front of the liquid
crystal display device is possible.
[0029]
As shown in FIG. 1, in the sound reproducing apparatus 1, the vibration generating means 5 is
provided at one edge of the panel 2 in the Y direction, and the fixing member 6 is provided at the
other edge. The panel 2 has a rectangular shape in which the dimension in the X direction is
longer than the dimension in the Y direction, and the panels 2 are arranged parallel to each other
near the edge on the long side of the panel 2 so that the longitudinal direction of the excitation
member 7 coincides with the X direction. It is done. Also, the excitation member 7 is located at
the center of the long side of the panel 2, and the magnetic drive means is also located at the
center of the long side.
[0030]
The fixing member 6 is formed of a rigid body such as synthetic resin or metal, and is provided
between the panel 2 and the base 4. The fixing member 6 in the present embodiment is formed
so that the dimension in the X direction is longer than the dimension in the Y direction and
shorter than the dimension in the X direction of the excitation member 7 of the vibration
generating means 5. In the fixing member 6 in the present embodiment, a notch 3a is formed in a
part of the damper 3 formed in a frame shape, and the fixing member 6 is provided in the notch
3a. Further, the fixing member 6 is provided in the central portion of the long side in the vicinity
of the long side of the panel 2.
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[0031]
The fixing member 6 is not limited to a rigid body formed in a block shape. For example, if the
base 4 is formed of a metal plate, the base 4 is L-shaped on the panel 2 side. It may be bent to fix
the front end surface to the panel 2.
[0032]
The length dimension, width dimension and thickness dimension of the fixing member 6 and the
length dimension of the vibration generating means 5 can be changed as appropriate.
[0033]
Next, the operation of the sound reproducing apparatus 1 will be described.
In the sound reproducing apparatus 1, when the coil 10 is energized based on the audio signal or
the music signal, the vibration generating means 5 generates self-vibration in the Z direction by
the magnetic driving force.
Since the panel 2 is supported at its periphery via the damper 3, the panel 2 itself vibrates.
[0034]
As shown in FIGS. 4 and 7, in the vibration generating means 5 (5A), in the magnetic driving
means having the magnet 8 and the coil 10, when the vibrational force acts between the
excitation member 7 and the panel 2, the excitation member 7 Is bent and deformed about the
central portion where the magnet 8 is provided. For example, when the magnet 8 is attracted to
the panel 2 in the Z1 direction, when the panel 2 is pulled in the Z2 direction by the connecting
portions 7a and 7a at both ends of the excitation member 7, the magnet 8 repels in the Z2
direction. The panel 2 is pushed in the Z1 direction by the connecting portions 7a, 7a.
[0035]
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Here, the fixing member 6 is positioned on the excitation reference line O at intervals in the Y
direction in the magnetic driving means of the vibration generating means 5, and the panel 2 is
partially restrained in the fixing member 6. There is. The connecting portions 7a and 7a are
located on both sides of the excitation reference line O, respectively. Therefore, the panel 2
vibrates with the excitation reference line O as a node. Therefore, even if the area of the panel 2
is small, the vibration becomes large, and the sound generation amount can be increased in a
wide frequency band.
[0036]
FIG. 8 is a graph comparing the comparative example and the above-described embodiment in
relation to the frequency (hertz) and the sound pressure level (SPL) (decibel). In FIG. 8, a graph
indicated by a dotted line is a comparative example, and a graph indicated by a solid line is the
present embodiment.
[0037]
The comparative example is the one shown in the sound reproducing apparatus 1 of the first
embodiment, in which the damper 3 is provided on the entire peripheral portion of the panel 2
and fixed to the base 4 without providing the fixing member 6.
[0038]
As shown in FIG. 8, in the comparative example, the sound pressure is output low from the low
frequency region to the high frequency region, but when the vibration generating means 5 is
driven to vibrate the panel 2, the vibrations in mutually opposite directions are output. Is
considered to be offset.
On the other hand, in the case where the fixing member 6 is provided as in the present
embodiment, the sound pressure can be improved over a wide band from the low frequency area
to the high frequency area.
[0039]
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FIG. 5 is a plan view showing a sound reproduction apparatus 1A according to a second
embodiment, and FIG. 6 is a modification of FIG. Each of the sound reproducing apparatuses 1A
and 1B has elliptical panels 2A and 2B, and dampers 3A and 3B are provided at peripheral
portions of the panels 2A and 2B, and the panels 2A and 2B are bases ) Is elastically supported
on each. The vibration generating means has the same configuration as the vibration generating
means 5.
[0040]
The present invention is not limited to the embodiment described above, and various
modifications are possible. For example, in the embodiment shown in FIG. 1, the panel 2 is an
oblong shape having a long side extending in the X direction, but the longitudinal dimension of
the panel 2 in the X direction is longer than the lateral dimension in the Y direction, It may be
elliptical or polygonal. In this case, the vibration generating means 5 and the fixing member 6 are
respectively provided in the center which divides the longitudinal direction into two by leaving a
space in the Y direction. Therefore, the excitation reference line O also extends in the Y direction
at a position that divides the longitudinal direction (X direction) into two.
[0041]
FIGS. 5 and 6 show the sound reproducing apparatuses 1A and 1B according to still another
embodiment of the present invention.
[0042]
In the sound reproducing apparatus 1A shown in FIG. 5, the vibration generating means 5 is
arranged so that the longitudinal direction coincides with the Y direction closer to the X1 side
than the center O1 of the panel 2A.
Further, fixing members 6A and 6A are provided at predetermined intervals on the X2 side
facing the vibration generating means 5 with the center O1 interposed therebetween. The fixing
members 6A, 6A are obtained by replacing a part of the damper 3A with a rigid body such as a
synthetic resin or metal, and are disposed symmetrically with respect to the X axis on the panel
2A.
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[0043]
In this embodiment, a line extending in the X direction through the center O1 is an excitation
reference line, and the fixing members 6A and 6A are disposed at equal distances on both sides
in the Y direction across the excitation reference line. It is done.
[0044]
In the sound reproducing apparatus 1A, when the coil 10 is energized and the vibration
generating means 5 is driven, the vibration at that time is transmitted to the whole of the panel
2A, but each of the fixing members 6A and 6A and the vibration generating means The lines
connecting to the center of 5 vibrate as nodes of vibration, and the sound pressure can be
improved especially in the high frequency band.
[0045]
In the sound reproducing apparatus 1B shown in FIG. 6, the vibration generating means 5 is
disposed at the center of the panel 2B so that the Y direction coincides with the longitudinal
direction, and the X1 side sandwiching the center O2 (vibration generating means 5) The fixing
members 6B and 6B formed of the same rigid body as described above are provided at the end
portion of the lens and the end portion on the X2 side.
Also in this case, the excitation reference line extends in the X direction through the center O2,
and the fixing members 6B and 6B are located on the excitation reference line.
Therefore, the sound pressure can be improved in a wide frequency band.
[0046]
In the sound reproducing devices 1A and 1B, even when the base is formed of a metal plate, a
portion of the metal plate may be cut and raised to fix the panels 2A and 2B as a fixing member.
Good. Further, as shown in FIG. 7, the vibration generating means 5 may be integrated using the
sheet 11 to simplify the manufacturing process. The fixing member 6 may be provided at the
center of the panels 2, 2A, 2B.
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[0047]
FIG. 2 is a plan view showing the sound reproducing apparatus according to the first
embodiment of the present invention, a view taken in the direction of arrows 2 in FIG. 1, a cross
sectional view taken along line 3-3 in FIG. FIG. 6 is a plan view showing another embodiment of
the sound reproducing apparatus according to the present invention, a plan view showing
another embodiment of the sound reproducing apparatus according to the present invention, a
sectional view showing a modification of the vibration generating means, and a comparative
example And a graph comparing the above embodiments in relation to frequency and sound
pressure level,
Explanation of sign
[0048]
1, 1A, 1B Sound reproduction device 2, 2A, 2B Panel 3, 3A, 3B Damper 4 Base 4a Opening 5, 5A
Vibration generating means 6, 6A, 6B Fixing member 7 Excitation member 7a Connecting portion
8 Magnet 9 Yoke 10 Coil 11 sheets
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