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JP2014165862

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JP2014165862
Abstract: To provide a lightweight and thin speaker that can be installed on a ceiling or a wall
while suppressing interference. An electrostatic speaker unit outputs a plane wave with high
directivity in the normal direction of a vibrating surface. The sound output from the first surface
(rear surface) of the electrostatic speaker unit is absorbed by the sound absorbing material
because the sound absorbing material has a surface area equal to or larger than the surface area
of the electrostatic speaker unit. Even if there is a remaining sound that is not absorbed by the
sound absorbing material, the sound insulating material prevents the sound from passing
through, and it is reflected by another object and output from the second surface (front) of the
electrostatic speaker unit There is no interference with sound waves. The sound insulation
material may be a wall or a ceiling itself, or a thin sound insulation material may be provided
separately. [Selected figure] Figure 2
スピーカ
[0001]
The present invention relates to a speaker that emits sound based on an input audio signal.
[0002]
Conventionally, as a general speaker, a dynamic type speaker provided with a dynamic type
speaker unit is known (refer to Patent Document 1).
04-05-2019
1
The dynamic speaker unit includes a permanent magnet to vibrate the vibrating surface by an
electromagnetic force.
[0003]
In addition, since the dynamic speaker unit becomes heavy by providing the permanent magnet,
it needs sufficient strength for installation on a ceiling or a wall.
[0004]
Therefore, it is conceivable to use a sheet-shaped electrostatic speaker.
The electrostatic speaker can be installed on a ceiling or a wall without special reinforcement
because it is lightweight.
[0005]
Japanese Patent Laid-Open No. 63-90299
[0006]
However, since the electrostatic speaker outputs plane waves from both sides of the vibrating
surface in the normal direction of the vibrating surface, when one surface is installed on a ceiling
or a wall, the sound wave output from the one surface is the ceiling And may be reflected on a
wall or the like and interfere with the sound wave output from the other vibration surface.
[0007]
Then, an object of this invention is to provide the lightweight and thin speaker which can be
installed in a ceiling, a wall, etc., suppressing interference.
[0008]
The speaker according to the present invention includes an electrostatic speaker unit, and a
sound absorbing material provided on the first surface side of the electrostatic speaker unit and
at least the surface area of the electrostatic speaker unit is disposed, and the sound absorbing
material Among them, a sound insulating material provided on the side opposite to the side on
which the electrostatic speaker unit is disposed, and at least the surface area of the electrostatic
04-05-2019
2
speaker unit is disposed, the electrostatic speaker unit, the sound absorbing material, and the
sound insulating material A holding member for holding the
[0009]
In general, the speaker radially outputs sound waves having opposite phases to each other in
opposite directions.
Since the sound waves output in one direction turn around in the other direction, interference
occurs.
In particular, bass tends to interfere because its directivity is weaker than treble.
Thus, common speakers require a baffle and an enclosure to prevent interference.
Also, the enclosure requires a sufficient space volume to ensure the amplitude of the vibrating
surface.
[0010]
On the other hand, since the electrostatic speaker unit outputs plane waves with strong
directivity in the normal direction of the vibrating surface (that is, the front side and the back
side of the vibrating surface), the output plane waves are hard to wrap around in each other.
Therefore, in the speaker according to the present invention, even if the baffle and the enclosure
are not provided, only the sound in the back direction (plane wave) is extinguished by providing
the sound absorbing material on the back surface, and the interference due to the wraparound is
prevented.
[0011]
In addition, the electrostatic speaker unit hardly outputs low-pitched sound that is easy to wrap
04-05-2019
3
around and difficult to absorb. Therefore, the speaker of the present invention can sufficiently
eliminate the sound in the back direction even with the sound absorbing material alone.
[0012]
Further, the sound absorbing material is held between the electrostatic speaker unit and the
sound insulating material by the holding member. The sound output from the first surface (rear
surface) of the electrostatic speaker unit is absorbed by the sound absorbing material because
the sound absorbing material has a surface area equal to or larger than the surface area of the
electrostatic speaker unit. Even if there is a remaining sound that is not absorbed by the sound
absorbing material, the sound insulating material prevents the sound from passing through, and
it is reflected by another object and output from the second surface (front) of the electrostatic
speaker unit There is no interference with sound waves. The sound insulation material may be a
wall or a ceiling itself, or a thin sound insulation material may be provided separately.
[0013]
Thus, even if the speaker of the present invention has a lightweight and thin structure without
the baffle and the enclosure, the sound output from the first surface of the electrostatic speaker
unit is reflected, for example, to the ceiling or wall. Interference with direct sound output from
the second surface of the electrostatic speaker unit can be prevented. Therefore, the speaker of
the present invention can be installed on a ceiling, a wall or the like on the first surface side (back
side) of the electrostatic speaker unit.
[0014]
The holding member may have a housing shape that integrally accommodates the electrostatic
speaker unit, the sound absorbing material, and the sound insulating material.
[0015]
In this configuration, the speaker does not output the sound output from the first surface of the
electrostatic speaker unit to the outside, so even if there is an object that reflects the sound on
the first surface side of the electrostatic speaker unit, the speaker is installed It is possible.
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Furthermore, since the holding member integrally accommodates the electrostatic speaker unit,
the sound absorbing material, and the sound insulating material, the speaker has excellent
portability and good installation.
[0016]
The holding member is preferably made of a cardboard or a polypropylene foam sheet.
[0017]
Cardboard and polypropylene foam sheets are lightweight as members while providing the
necessary strength to hold the electrostatic speaker unit, the sound insulation material, and the
sound absorption material.
Thus, cardboard and polypropylene foam sheets are desirable materials for installing lightweight
speakers on a ceiling or wall or the like.
[0018]
In addition, the holding member may have a mode in which the second surface side of the
electrostatic speaker unit is provided with a sticking surface for sticking a medium.
[0019]
Furthermore, the affixing surface may be made of a material that allows the medium to be
repeatedly peeled off.
[0020]
In this case, the speaker can be installed in a mode in which a visual information providing
medium (for example, a poster) is attached to the attachment surface.
[0021]
Preferably, the sound absorbing material is made of polyurethane foam.
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[0022]
The polyurethane foam can be formed to have a smooth surface as compared to a sound
absorbing material such as glass wool.
The electrostatic speaker unit is kept overlapping with the sound absorbing material made of
polyurethane foam whose surface is smoothed, whereby the surface is maintained in a smooth
shape.
In addition, polyurethane foam has a high sound absorption coefficient and good processability,
and can be processed into, for example, a plate having a uniform thickness, and at low cost.
[0023]
According to the present invention, the speaker can suppress interference even when installed
on, for example, a ceiling or a wall while taking advantage of the thin and lightweight
characteristics of the electrostatic speaker unit.
[0024]
FIG. 2 is an oblique projection view of the lower surface of the speaker 1 according to the first
embodiment.
FIG. 2 is a view showing an installation state of the speaker 1 according to Embodiment 1.
It is a graph which shows the sound emission characteristic of the speaker 1 which concerns on
Embodiment 1. FIG.
FIG. 6 is a view showing a speaker 2 according to a second embodiment. It is a perspective view
of the front of speaker 2A concerning the modification of speaker 2. FIG. It is a figure which
shows the installation state of the speaker 2A. FIG. 10 is a perspective view of the front of the
speaker 3 according to a third embodiment.
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[0025]
The speaker 1 which concerns on Embodiment 1 is demonstrated using FIG. 1 and FIG. FIG. 1 is a
perspective view of the lower surface of the speaker 1. FIG. 2 is a cross-sectional view taken
along the line A-A when the speaker 1 is installed on the wall surface W. As shown in FIG.
[0026]
The speaker 1 is connected via an amplifier 14 and a speaker cable 15. The speaker 1 emits
sound based on the audio signal output from the amplifier 14.
[0027]
As shown in FIG. 1, the speaker 1 has a rectangular parallelepiped shape which is long in the
height direction (Y and -Y directions in the drawing) and thin (Z and -Z directions in the drawing).
The height of each of the front surface (surface on the Z side in the drawing) and the back
surface (surface on the -Z side in the drawing) of the speaker 1 is equal to the size A0 of the
industrial standard of paper. The front and back of the speaker 1 each have a width (in the X and
-X directions in the figure) slightly longer (for example, 3 cm) than the paper industry standard
dimension A0. The thickness of the speaker 1 is, for example, 4 cm. Hereinafter, in FIG. 1, the
surface on the Y side of the speaker 1 is the upper surface, the surface on the -Y side is the lower
surface, the surface on the X side is the right surface, and the surface on the -X side is the left
surface. However, the shape of the front and back of the speaker 1 is not limited to the size A0 of
the industrial standard of paper, and is arbitrary. For example, the front and back of the speaker
1 may be equal to the paper industry standard dimension B1 or dimension B2, or may be a
dimension according to another standard (for example, a dimensional standard of a building
material), or a standard It may be a height or width that does not depend.
[0028]
The speaker 1 includes a holding frame 10L, a holding frame 10R, an electrostatic speaker unit
11, and a sound absorbing sponge 12.
[0029]
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As shown in FIG. 1, the electrostatic speaker unit 11 has a rectangular sheet shape that is long in
the height direction, and is a thin and lightweight speaker unit.
The surface (XY plane) of the electrostatic speaker unit 11 has substantially the same shape as
the front of the speaker 1, and the width is slightly shorter (for example, 3 cm) than the width of
the speaker 1. The thickness of the electrostatic speaker unit 11 is 1.5 mm, for example.
[0030]
As shown in FIG. 1, the sound absorbing sponge 12 is a rectangular solid which is long in the
height direction and thin. The height of the sound absorbing sponge 12 is the same as the height
of the electrostatic speaker unit 11. The width of the sound absorbing sponge 12 is, for example,
1 cm longer than the width of the electrostatic speaker unit 11 in the left-right direction. The
thickness of the sound absorbing sponge 12 is, for example, 3 cm. The sound absorbing sponge
12 is made of a lightweight material (for example, polyurethane foam) having a high sound
absorption coefficient.
[0031]
The front surface (the surface on the Z side in the drawing) of the sound absorbing sponge 12 is
in contact with the back surface (the surface on the -Z side in the drawing) of the electrostatic
speaker unit 11, as shown in FIG.
[0032]
The holding frame 10 </ b> L and the holding frame 10 </ b> R are made of a lightweight foam
sheet having strength for holding the electrostatic speaker unit 11 and the sound absorbing
sponge 12, respectively.
The foamed sheet is formed by extrusion foaming of polypropylene. The holding frame 10L and
the holding frame 10R are each long in the height direction as shown in FIG. The holding frame
10L (and the holding frame 10R) is disposed on the left side surface (and the right side surface)
of the speaker 1. The holding frame 10L includes a front surface portion 100L and a side surface
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portion 101L. As shown in FIG. 2, the holding frame 10 </ b> L is L-shaped when the speaker 1
is viewed in the −Y direction. The holding frame 10R is composed of a front surface portion
100R and a side surface portion 101R. The holding frame 10R has an L-shape in which the left
and right are inverted when the speaker 1 is viewed in the -Y direction.
[0033]
The front surface portion 100L and the front surface portion 100R are disposed in the front
direction of the speaker 1 more than the electrostatic speaker unit 11, as shown in FIG. The front
surface portion 100L and the front surface portion 100R are arranged to overlap the left and
right edges of the electrostatic speaker unit 11 in a front view of the speaker 1.
[0034]
The speaker 1 is installed so that the back surface faces the wall surface W, as shown in FIG. That
is, the sound absorbing sponge 12 is disposed closest to the wall surface W. The rear surface side
of the holding frame 10L and a part of the rear surface of the sound absorbing sponge 12 are
bonded to the wall surface W by a double-sided tape 16, respectively. The back side of the
holding frame 10R is also bonded to the wall surface W with the double-sided tape 16
respectively.
[0035]
By bonding the holding frame 10L and the holding frame 10R to the front surface portion 100L
and the front surface portion 100R, the right edge and the left edge of the electrostatic speaker
unit 11 and the sound absorbing sponge 12 are shown in FIG. Side). As a result, as shown in FIG.
2, the holding frame 10L and the holding frame 10R hold the arrangement of the electrostatic
speaker unit 11, the sound absorbing sponge 12 and the wall surface W, respectively.
[0036]
A hole 13 for passing the speaker cable 15 is provided in the side surface portion 101R. One end
of the speaker cable 15 is connected to the electrostatic speaker unit 11. The other end of the
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speaker cable 15 is connected to the amplifier 14. The audio signal output from the amplifier 14
vibrates the internal vibration surface of the electrostatic speaker unit 11 in the normal direction
of the vibration surface. As a result, the electrostatic speaker unit 11 outputs a plane wave
parallel to the front of the speaker 1 in the front direction and the back direction.
[0037]
The plane wave output in the back direction of the speaker 1 is absorbed by the sound absorbing
sponge 12. The sound absorbing sponge 12 can absorb the entire plane wave because the area of
the front is larger than the surface area of the electrostatic speaker unit 11. Even if there is a
plane wave that passes through the sound absorbing sponge 12 without being completely
absorbed, the plane wave does not pass through the wall surface W corresponding to the sound
insulation material of the present invention. The reflected wave reflected by the wall surface W
travels in the direction opposite to the plane wave reaching the wall surface W, since the wall
surface W is parallel to the electrostatic speaker unit 11. That is, the reflected wave returns to
the back surface (surface on the −Z side) of the sound absorbing sponge 12 and does not spread
to the outside of the speaker 1. When the reflected wave reaches the sound absorbing sponge 12,
it is absorbed again. As a result, the plane wave output from the electrostatic speaker unit 11 in
the back direction of the speaker 1 is absorbed by the sound absorbing sponge 12 and does not
cause interference with the plane wave output in the front direction of the speaker 1.
[0038]
FIG. 3 is a graph showing the sound emission characteristics of the speaker 1. The horizontal axis
is the frequency of the sound emitted from the speaker 1, and the vertical axis is the sound
pressure of the sound emitted from the speaker 1. The measurement position of the sound
pressure is a position 1 m away from the speaker 1 in the front direction of the speaker 1.
[0039]
In FIG. 3, the solid line indicates the sound emission characteristic of the speaker 1 when
installed on the wall surface W. The dotted line shows the sound emission characteristic of only
the electrostatic speaker unit 11 not having the sound absorbing sponge 12, and the release
when no object (for example, the wall W) reflecting the sound is disposed in the back direction of
the electrostatic speaker unit 11. It is a sound characteristic. That is, the dotted line is an ideal
04-05-2019
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sound emission characteristic because the sound output in the back direction of the electrostatic
speaker unit 11 is not reflected and does not wrap around in the front direction. The broken line
indicates the sound emission characteristics when the wall W is disposed at a position 3 cm away
from the back of the electrostatic speaker unit 11 without the sound absorbing sponge 12
disposed. That is, the broken line indicates the sound emission characteristic when the reflected
sound reflected by the wall surface W interferes with the direct sound generated on the front
side of the electrostatic speaker unit 11.
[0040]
When direct sound receives interference from the reflected sound, it strengthens the sound if it is
in phase and weakens the sound if it is antiphase. Therefore, as shown by the broken line in FIG.
3, the direct sound subjected to the interference has a sound pressure higher or lower than the
ideal sound emission characteristic in a specific frequency band. In particular, direct sound
subjected to interference has a large drop in sound pressure on the low frequency side. In the
example of FIG. 3, the lower frequency at which the sound pressure is 10 dB lower than the peak
sound pressure (hereinafter referred to as the reproduction low frequency). ), The reproduction
low frequency of the ideal sound emission characteristic is 400 Hz, while the reproduction low
frequency in the case of direct sound interference is 500 Hz.
[0041]
On the other hand, the sound emission characteristics of the speaker 1 are closer to the ideal
sound emission characteristics than the sound emission characteristics shown by the broken line
in FIG. In particular, the sound emission characteristic of 400 Hz or more of the speaker 1 is
substantially equal to the ideal sound emission characteristic. Further, the reproduction low
frequency of the speaker 1 is 400 Hz, which is equal to the reproduction low frequency of the
ideal sound emission characteristic. Furthermore, the sound emission characteristic of the
speaker 1 is higher in sound pressure than the sound emission characteristic shown by the
broken line in FIG. 3 even in the band of less than 400 Hz, and approaches the ideal sound
emission characteristic. That is, the speaker 1 is preventing the sound pressure fall of the low
region by interference.
[0042]
As described above, the speaker 1 can suppress the interference even when the back surface is
installed on the wall surface W while making use of the lightweight and thin characteristics of
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11
the electrostatic speaker unit 11.
[0043]
The area of the front of the sound absorbing sponge 12 may be at least the same as the surface
area of the electrostatic speaker unit 11 because the plane waves do not spread radially.
[0044]
The speaker 1 may be installed on a ceiling without being installed on the wall W, or may be
attached to a resin plate having a sound insulation effect.
For example, the speaker 1 may be attached to a partition made of a resin plate.
In this case, the speaker 1 can be installed not only on the wall surface and the ceiling.
[0045]
In addition, although the speaker 1 is equipped with the sound absorption sponge 12 which
consists of polyurethane foams as a member which absorbs sound, you may be another member.
[0046]
For example, since the sound absorbing member having a higher sound absorption coefficient
can absorb sound even if the thickness is thin, the thickness of the speaker 1 can be reduced.
As a sound absorbing member having a high sound absorption coefficient, polyurethane foam or
glass wool is suitable.
[0047]
Also, for example, if a sound absorbing material having a smoother surface is used, the vibration
04-05-2019
12
surface and the electrode surface of the electrostatic speaker unit 11 in contact with the sound
absorbing material tend to be smooth. As a result, the speaker 1 suppresses distortion of a plane
wave caused by the uneven shape of the vibration surface and the electrode surface of the
electrostatic speaker unit 11, and makes it easy to maintain the directivity of the plane wave. A
polyurethane foam or glass wool with a smooth film attached to the surface is suitable as a sound
absorbing member that can easily make the surface smooth.
[0048]
In addition, for example, the sound absorbing member with higher strength can maintain its
shape by itself and improve the installation. Glass wool is suitable as a sound absorbing member
having high strength. Further, the sound absorbing member with better processability is easy to
process (for example, in a plate shape) in accordance with the shape of the electrostatic speaker
unit 11, and facilitates thickness adjustment (for example, uniformization of thickness). A
polyurethane foam or a thick non-woven fabric (made of industrial fibers or animal hair) is
suitable as a sound-absorbing member having good processability. Polyurethane foam is also
excellent in that it is less expensive than other members.
[0049]
As described above, the polyurethane foam has a high sound absorption coefficient and not only
makes the surface of the electrostatic speaker unit 11 in contact smooth but also has good
processability and low cost. It is optimal.
[0050]
Further, the holding frame 10L and the holding frame 10R are not limited to the aspect made of
polypropylene.
For example, if a stronger member is used, the electrostatic speaker unit 11 and the sound
absorbing sponge 12 can be held even if it is thin or small. As a member having high strength, a
PET plate or a carbon fiber reinforced resin plate is suitable.
[0051]
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For example, a lighter member can make the speaker 1 lighter and improve the installation of the
speaker 1. As a lightweight member, a polypropylene foam sheet, a cardboard or a carbon fiber
reinforced resin board is suitable.
[0052]
For example, a member with better processability can be easily processed according to the
shapes of the electrostatic speaker unit 11 and the sound absorbing sponge 12. As a member
with good processability, a cardboard or polypropylene foam sheet is suitable. Cardboard and
polypropylene foam sheets are also low in cost.
[0053]
As described above, the cardboard and polypropylene foam sheets have strength for holding the
arrangement of the electrostatic speaker unit 11, the sound absorbing sponge 12, and the wall
W, are lightweight, are easy to process, and are low in cost. Therefore, it is optimal as a holding
member of the speaker 1.
[0054]
Further, the holding frame 10L and the holding frame 10R are not limited to L-shaped (or Lshaped inverted horizontally) when looking at the speaker 1 in the height direction, and may be,
for example, U-shaped, and maintain the arrangement It may have any shape as long as it
[0055]
Next, the speaker 2 according to the second embodiment will be described with reference to FIG.
FIG. 4A is a perspective view of the front of the speaker 2.
FIG. 4B is a cross-sectional view taken along the line B-B. The description of the configuration
overlapping with the speaker 1 is omitted.
04-05-2019
14
[0056]
The speaker 2 holds the electrostatic speaker unit 11, the sound absorbing sponge 21, and the
sound insulation member 22 in the housing 20 in place of the holding frame 10 L and the
holding frame 10 R provided in the speaker 1.
[0057]
The speaker 2 includes an electrostatic speaker unit 11, a housing 20, a sound absorbing sponge
21, and a sound insulating member 22 as shown in FIG. 4 (B).
[0058]
The shape and material of the sound absorbing sponge 21 and the arrangement relationship with
the electrostatic speaker unit 11 are the same as the sound absorbing sponge 12 of the speaker
1 respectively.
[0059]
The sound insulation member 22 is made of a resin plate having a thickness of 3 mm.
The front surface (surface on the Z side) of the sound insulation member 22 is, as shown in FIG.
4B, on the back surface (surface on the -Z side) of the sound absorbing sponge 21 opposite to the
side where the electrostatic speaker unit 11 is disposed. It is abutted.
The shape of the front of the sound insulating member 22 matches the shape of the back of the
sound absorbing sponge 21.
That is, the surface area of the sound insulating material 22 is larger than the surface area of the
electrostatic speaker unit 11. However, the surface area of the sound insulating material 22 may
be at least the same as the surface area of the electrostatic speaker unit 11 because the plane
waves do not spread radially.
[0060]
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15
As shown in FIG. 4A, the housing 20 is a rectangular parallelepiped-shaped box which is long in
the height direction (Y, -Y direction in the drawing) and thin (Z, -Z direction in the drawing). The
housing 20 is open at the front so as to expose other than the front edge of the electrostatic
speaker unit 11. Each surface of the housing 20 is made of cardboard with a thickness of 5 mm.
[0061]
As shown in FIG. 4B, the housing 20 integrally accommodates the electrostatic speaker unit 11,
the sound absorbing sponge 21, and the sound absorbing material 22. That is, the height (in the
figure, Y and -Y directions) and the width (in the figures, X and -X directions) of the inside 24 of
the case shown by the dotted line in FIG. Slightly long. The depth (in the figure, Z and -Z
directions) of the inside 24 of the housing is equal to the total length of the thickness of the
electrostatic speaker unit 11, the thickness of the sound absorbing sponge 21, and the thickness
of the sound insulating material 22. However, the height and width of the inside 24 of the case
may be any size, not limited to the size A0 of the industrial standard of paper, provided that the
electrostatic speaker unit 11, the sound absorbing sponge 12 and the sound insulating member
22 are accommodated. Good.
[0062]
The plane wave that has passed through the sound absorbing sponge 21 reaches the sound
insulating material 22. Since the sound insulation member 22 does not pass the plane wave, it
does not make a sound in the back direction. Even if there is a plane wave passing through the
sound insulation member 22, the rear surface of the housing 20 also prevents the sound from
being output in the direction of the rear surface of the speaker 2 as the sound insulation
member.
[0063]
Since the speaker 2 does not emit sound from the back due to the sound absorbing sponge 21
and the sound insulating member 22, the speaker 2 can be installed even if an object reflecting
the sound exists on the back. Furthermore, since the speaker 2 includes the housing 20, the
speaker 2 is excellent in portability and installation.
04-05-2019
16
[0064]
Next, a speaker 2A according to a modification of the speaker 2 will be described using FIGS. 5
and 6. FIG. 5 is a perspective view of the front of the speaker 2A. FIG. 6 is a diagram showing the
installation state of the speaker 2A. The description of the configuration overlapping with the
speaker 2 is omitted.
[0065]
The speaker 2A is different from the speaker 2 in that the speaker 2A can be suspended and
installed. The speaker 2 includes an electrostatic speaker unit 11, a housing 20, a sound
absorbing sponge 21, a sound insulating member 22, a hook 23U, and a hook 23B. The hooks
23U are attached to the top surface of the housing 20. The hooks 23B are attached to the lower
surface of the housing 20.
[0066]
As shown in FIG. 6A, the speaker 2A is suspended and installed by the hook 23U being hooked
on the bracket 200 fixed to the ceiling C. In the speaker 2A, as shown in FIG. 6B, the hook 23U is
hooked on the bracket 200 fixed to the ceiling C, and the hook 23B is hooked on the bracket 201
fixed to the wall surface W. Hanging diagonally installed. In either installation, the speakers 2A
can be installed even if the back is directed to the wall or the four corners of the room, since no
sound is emitted in the back direction.
[0067]
Next, the speaker 3 according to the third embodiment will be described with reference to FIG.
FIG. 7A is a perspective view of the lower surface of the speaker 3. FIG. 7B is a cross-sectional
view of the installed speaker 3 taken along the line C-C. The description of the configuration
overlapping with the speaker 1 is omitted.
[0068]
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17
The speaker 3 is different from the speaker 1 and the speaker 2 in that the medium (for example,
the poster 32) can be repeatedly attached to the front. The speaker 3 includes a holding frame
10 LA, a holding frame 10 RA, an electrostatic speaker unit 11, and a sound absorbing sponge
12. The holding frame 10LA includes a front surface portion 100LA and a side surface portion
101L. The holding frame 10RA includes a front surface portion 100RA and a side surface portion
101R.
[0069]
As for front part 100LA and front part 100RA, the polypropylene sheet is crimped | bonded to
each surface by PP (; Poly-Propylene) process. As a result, the front surface 100LA and the front
surface 100RA have smooth surfaces, and the strength of the surfaces is increased.
[0070]
The front surface portion 100LA and the front surface portion 100RA are provided on the front
side of the speaker 3 with respect to the electrostatic speaker unit 11, so that the poster 32 can
be attached. Moreover, since the front of the sound absorption sponge 12 which contact | abuts
the electrostatic speaker unit 11 is smooth, a front becomes smooth. Then, the poster 32 is
smoothed by coming into contact with the electrostatic speaker unit 11 whose front is smooth
except for the left and right edges, so the appearance of the speaker 3 is improved. Also, in
general, a paper medium such as a poster is likely to be broken if the back surface is in contact
with the uneven surface, and if the raised area can be held down with a finger, for example,
without contact with the uneven surface. However, since the front face of the electrostatic
speaker unit 11 in contact with the poster 32 is smooth, the poster 32 is unlikely to be broken
even if pressed by a finger, for example. Furthermore, since the exposed front surface of the
electrostatic speaker unit 11 is substantially the same in shape as the paper industry standard
A0, a plane wave can be output from substantially the entire surface of the poster 32.
[0071]
In addition, since the front surface 100LA and the front surface 100RA are smooth and have
increased strength, the adhesive tape 31 can be repeatedly attached. However, even if the
speaker 3 is not subjected to PP processing on the front surface portion 100LA and the front
04-05-2019
18
surface portion 100RA, the poster 32 can be attached by the adhesive tape 31. In addition, the
aspect which affixes the poster 32 not only with the adhesive tape 31 but with an adhesive agent
is also possible. Of course, the poster 32 may be attached to the front of the speaker 1 according
to the first embodiment or the speaker 2 according to the second embodiment. As described
above, the thin, light, and shape-retainable speaker 3 can be used as a POP (Point of Purchase)
advertisement in combination with the easily replaceable poster 32.
[0072]
1, 2, 2A, 3 ... speaker 10L, 10LA ... holding frame 10R, 10RA ... holding frame 11 ... electrostatic
speaker unit 12, 21 ... sound absorbing sponge 13 ... hole 14 ... amplifier 15 ... speaker cable 16 ...
double-sided tape 20 ... housing Body 24 ... housing inside 22 ... sound insulation 23B, 23U ...
hook 100L, 100LA ... front section 100R, 100RA ... front section 101L, 101R ... side section 200,
201 ... bracket
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