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JPWO2013005321

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
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DESCRIPTION JPWO2013005321
Abstract: A vibration in a frame comprising: a flat diaphragm; diaphragm driving means for
vibrating the diaphragm by an audio signal inputted from the outside; and a frame for supporting
the diaphragm and the diaphragm driving means On the side opposite to the side on which the
plate is supported, a back surface sound emission hole is opened which emits a back surface
sound, which is a sound radiated to the back surface side of the speaker unit when the
diaphragm of the speaker unit vibrates. A speaker unit, and a back surface sound reflection
surface which internally houses the speaker unit and reflects the back surface sound radiated
from the back surface sound emission hole in the speaker unit to the side, A housing in which a
bass reflex port, which is an opening for radiating a back sound reflected toward the outside to
the outside, is formed on a side wall
スピーカシステム
[0001]
The present invention relates to a speaker system, and more particularly to a speaker system that
can be made small and thin and is excellent not only in high-pitched sound reproduction but also
in low-pitched sound reproduction.
[0002]
In recent years, various thin AV devices such as liquid crystal television receivers, plasma display
television receivers, organic electroluminescence television receivers, etc. have been put to
practical use.
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[0003]
The speakers used in these thin AV devices are required to be thinner than conventional
speakers, but if a simply miniaturized conventional cone-type speaker is used, it is necessary to
reproduce the bass. There is a problem of lack of sound pressure.
[0004]
Therefore, a so-called multi-speaker system in which a plurality of small cone-shaped speakers
are arranged on the surface has been studied.
[0005]
However, in the multi-speaker system, since a large number of small speakers are made to ring at
one time, a large output amplifier is required, and there is a problem that power consumption
increases.
[0006]
Further, as another method, it has been considered to use a flat speaker having a flat speaker and
a flat diaphragm in place of the cone speaker.
[0007]
The flat panel speaker includes, for example, an exciter having a magnetic circuit, a voice coil,
and a bobbin for holding the voice coil, and disposed on both left and right or upper and lower
end portions of the thin display device; There is a thing provided with a translucent flat plate
which is arranged and doubles as a diaphragm which is vibrated by the exciter to generate
flexural vibration (Japanese Patent Application Laid-Open Nos. 2004-289772 and 2004312643).
[0008]
In addition, as a flat panel loudspeaker, a visible display screen, a resonant panel-shaped member
disposed adjacent to the display screen, which is at least partially transparent, and through which
the display screen can be viewed; A loudspeaker drive unit (Japanese Patent Laid-Open No.
2002-533957) comprising a vibration excitation means for driving and resonating a panel
member to act as an acoustic radiator, a thin plate-like main body, and one side of the main body
A vibrator configured to vibrate the body to generate a deflection corresponding to the frequency
of the vibration, and a supporting device configured to support the body to a fixed object fixed to
the earth; The support device forms a vibration insulator having vibration insulation with respect
to the fixed object, and the main body has a connector on one side of the main body. Form, the
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said connector has a display (JP 2005-94377) which the connector end of the electrical cable for
transmitting an audio signal to the vibrator is connected.
[0009]
The flat panel speaker can generate low tones by appropriately selecting the size and the
material of the diaphragm, but since it involves vibration during reproduction, it can not be
attached to a device for avoiding vibration, such as a television receiver.
[0010]
As a flat speaker, flat and rectangular permanent magnets are arranged on the yoke so that pole
faces of different polarities are alternately located, and both sides of the diaphragm correspond
to the permanent magnets, respectively. There is a flat acoustic transducer (WO 2000/078095)
in which spiral coil pairs are arranged.
A plurality of magnetic circuit modules having a substantially rectangular flat plate, a main
magnet fixed to the bottom surface of the plate, and a yoke fixed to the bottom surface of the
main magnet are connected to each other and configured. The yoke has a side wall portion
forming a substantially linear magnetic gap Ga between at least one side of the substantially
rectangular shape of the plate, and a connecting portion fixed to a yoke of another magnetic
circuit module disposed adjacent to the side wall portion. And the respective plates of the first
magnetic circuit module and the second magnetic circuit module to which the connection
portions are fixed communicate with the magnetic gap Ga and are substantially orthogonal to the
magnetic gap Ga. A speaker magnetic circuit forming a linear magnetic gap Gb, a diaphragm, and
a position corresponding to the gap Ga and the gap Gb in the speaker magnetic circuit on the
back side of the diaphragm There are flat thin speaker having a vignetting coil (JP 2009118020).
[0011]
In these flat speakers, in order to prevent the air pressure inside the speaker unit from
suppressing the movement of the flat diaphragm, an opening is provided on the side of the
housing opposite to the diaphragm, and the sound wave is also behind There is something that is
made to emit.
[0012]
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However, if the above-described flat speaker is simply incorporated into the cabinet, the sound
may be rattling, and there is a problem that clear bass can not be reproduced.
[0013]
In addition, when a fibrous reflector or a sound absorbing material is provided in the interior of
the casing in order to prevent sound from being heard, there is a problem that the thickness of
the casing becomes large.
[0014]
The present invention relates to a speaker system, and in particular, it is an object of the present
invention to provide a speaker system that has a flat diaphragm and has a speaker unit that emits
sound also on the back side and that can reproduce clear bass.
[0015]
A speaker system according to the present invention comprises: a flat diaphragm; diaphragm
drive means for vibrating the diaphragm according to an audio signal inputted from the outside;
and the diaphragm and diaphragm drive means; On the side opposite to the side on which the
diaphragm is supported, a back sound radiation hole that emits a back sound, which is a sound
radiated to the back side of the speaker unit when the diaphragm of the speaker unit vibrates,
opens A speaker unit having a frame, and a rear sound reflection surface which houses the
speaker unit inside and reflects the rear sound radiated from the rear sound radiation hole in the
speaker unit to the side, A housing in which a bass reflex port, which is an opening for radiating
the rear sound reflected to the side by the rear sound reflection surface, is formed on the side
wall , And.
[0016]
The speaker system according to the present invention is also provided with a back sound
reflection provided on the side of the speaker unit adjacent to the side where the back sound
emission hole is open and reflecting back sound radiated from the back sound emission hole to
the side. A surface, a bass load portion for resonating a bass component of the back sound
reflected by the back sound reflection surface, and a back sound introduction hole for
introducing the back sound reflected by the back sound reflection surface into the bass load The
present invention also includes a speaker system including a back surface sound reflecting
member in which the speaker unit and the back surface sound reflecting member are housed in a
housing.
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[0017]
The speaker unit having a flat diaphragm radiates a plane wave in the vicinity of the speaker unit
even when the diaphragm area is small, and the sound wave emitted from the back radiation hole
is also a plane wave.
The plane wave has the property that the incident angle and the reflection angle are equal when
reflecting, so if the surface of the housing facing the back radiation hole is parallel to the
diaphragm, the reflected wave returns to the back radiation hole and the wavelength Because it
cancels and amplifies each other, it changes to a sound like a roar.
[0018]
On the other hand, in the speaker system of the present invention, the back sound generated by
vibrating the diaphragm in the speaker unit is radiated to the inside of the housing from the back
sound radiation hole provided in the frame of the speaker unit, In the back sound reflection
surface formed in the sound reflection member, the light is reflected sideways, in other words, in
a direction oblique to the radiation direction of the back sound, and is diffused inside the
housing.
Here, the back sound includes a high-tone component and a low-pitch component as well as the
front sound radiated from the diaphragm to the front, but the high-tone component is attenuated
while being reflected by the reflection plate and diffused inside the housing The bass is resonated
and expanded at the bass loading section with little attenuation, and is radiated outward from the
bass reflex port.
[0019]
In the speaker system of the present invention, since the back sound radiated from the back
radiation hole is reflected obliquely at the back sound reflection surface, the surface of the
housing facing the back radiation hole is parallel to the diaphragm as in the case The reflected
wave does not return directly to the back radiation hole.
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As a result, it is prevented that the back sound radiated from the back sound radiation hole and
the back sound reflected by the surface of the housing overlap each other and be canceled or
amplified, so the radiation from the back sound radiation hole The back sound does not change
to a sound like it sounds.
Therefore, the bass can be reproduced clearly.
Moreover, since it is not necessary to be filled with the fibrous reflector for preventing a lowpitched sound, the thickness of the housing can be reduced.
[0020]
In the speaker system of the present invention, it is preferable that the back surface sound
reflection plate be provided only in a portion of the housing or the back surface sound reflection
member that faces the back surface sound emission hole.
[0021]
The back sound radiated from the back sound radiation hole is not only the back sound reflection
surface but also the back surface by providing the back sound reflection surface only in a portion
facing the back sound emission hole in the housing or the back sound reflection member. It is
also reflected on the surface adjacent to the sound reflection surface.
Therefore, the diffusion effect of the back sound into the inside of the housing is higher as
compared with the speaker system in which the housing or the back sound reflection member is
provided with a uniform back sound reflection surface.
[0022]
As a speaker unit in the speaker system according to the present invention, the diaphragm drive
means is provided for each of the magnet and the magnet arranged such that one of the pole
faces faces the diaphragm, and the other pole face of the magnet And the yoke which is bent so
as to surround the magnet toward the diaphragm, and the magnet and the yoke in portions of the
surface of the diaphragm opposite to the magnet which are opposed to the magnet. And a voice
coil provided to interlink with the magnetic flux formed by the input and from which an audio
signal is input from the outside, and in the frame, a back sound emission hole is opened between
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the adjacent yokes. There is a speaker unit of the first form.
[0023]
In the speaker unit of the first aspect, the magnets are arranged in a line in a predetermined
direction, and the diaphragm is provided to face the magnet along the arrangement direction of
the magnets, so the sound is generated from the speaker unit The sound wave to be generated is
a plane wave, and both the front sound and the back sound have higher directivity.
[0024]
As a speaker unit in the speaker system according to the present invention, also, a diaphragm
drive means is provided with a first magnet whose N pole is disposed substantially parallel to the
surface of the diaphragm, and the S pole has the above-mentioned vibration. A second magnet
disposed in proximity to or adjacent to the first magnet so as to be substantially parallel to the
plane of the plate and to face the same side as the N pole of the first magnet; A first coil disposed
so that a magnetic flux is interlinked with a portion of the diaphragm corresponding to the N
magnet of the first magnet, and a magnetic flux at a portion corresponding to the S magnet of the
second magnet of the diaphragm Is fixed at a magnetic pole surface on the side opposite to the
side facing the diaphragm, and a second coil arranged so as to interlink with each other, the first
magnet and the second magnet The plate is solid so that it faces the first magnet and the second
magnet at its periphery. And a yoke that is, the speaker unit of the second embodiment the rear
sound radiating holes on the bottom surface of the yoke is open also used.
[0025]
In the speaker unit, since the N pole of the first magnet and the S pole of the second magnet are
disposed substantially in parallel with the plane of the diaphragm, the N pole of the first magnet
to the second pole A magnetic flux is generated toward the south pole of the magnet.
The magnetic flux in the region between the first and second magnets is then parallel to the
plane of the diaphragm.
Here, since the first magnet and the second magnet are disposed close to or adjacent to each
other, the magnetic flux density in the direction parallel to the plane of the diaphragm can be
maximized. The sound pressure of the front sound radiated to the front side from the diaphragm
and the back pressure emitted to the rear side can be maximized.
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[0026]
In addition, the first magnet and the second magnet are often arranged in a grid pattern.
In this case, in the series of the first magnet and the second magnet disposed in the central
portion, the surface of the diaphragm from the N pole of the first magnet to the S pole of the
second magnet is In contrast, although magnetic fluxes parallel to each other are generated, in
the case of those disposed at the peripheral portion, the magnetic flux may not necessarily be
parallel to the surface of the diaphragm in one piece facing outward.
[0027]
However, since the yoke also serves as a frame for supporting the diaphragm at its periphery, the
periphery of the yoke is in the form of a tray standing from the bottom so as to be able to
support the diaphragm.
Thus, magnetic flux is generated not only between the adjacent magnets but also between the
adjacent magnets in the first magnet and the second magnet located at the peripheral portion,
but this magnetic flux also oscillates. It is parallel to the plane of the plate.
Therefore, the magnetic flux generated in the peripheral portion of the first and second magnets
is also effectively used to vibrate the diaphragm.
In addition, since the leaf back sound emission hole is opened at the bottom of the yoke, not only
the front sound but also the back sound can be emitted effectively.
[0028]
As a housing in the speaker system according to the present invention, a speaker unit attachment
portion to which a speaker unit is attached, a diffusion portion which communicates with the
speaker unit attachment portion and to which back sound from the speaker unit is diffused, The
speaker unit is formed to face the speaker unit between the speaker unit attachment unit and the
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diffusion unit between the resonance unit in communication with the speaker unit and the
speaker unit attachment unit and the diffusion unit. What has a back sound reflective surface
reflected toward the said spreading | diffusion part can be used.
[0029]
The back sound reflection surface can be provided at a position facing the back sound radiation
hole provided in the speaker unit when the speaker unit is attached to the speaker unit
attachment portion in the housing.
[0030]
In the speaker system having the housing, the back sound radiated from the speaker unit
mounted to the speaker unit mounting portion in the housing is diffused to the diffusion section
by the back sound reflection surface.
And the back sound diffused to the said spreading | diffusion part is radiated | emitted outside
from the buffless port opened to the resonance part, after resonating in a resonance part.
[0031]
As described above, according to the present invention, there is provided a speaker system
having a flat speaker type speaker unit which does not have bass.
[0032]
FIG. 1 is a perspective view showing the overall configuration of the speaker system according to
the first embodiment.
FIG. 2 is a perspective view showing the relative positional relationship between the speaker unit,
the spacer, and the housing in the speaker system according to the first embodiment.
FIG. 3A is a plan view of a speaker unit provided in the speaker system according to the first
embodiment.
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FIG. 3B is a cross-sectional view showing a cross section of the speaker unit taken along a plane
AA in FIG. 3A.
FIG. 4 is a cross-sectional view showing a cross section of the speaker unit shown in FIGS. 3A and
3B taken along plane B-B in FIG. 3A.
FIG. 5 is a perspective view showing the opposing positional relationship of the magnet, the yoke,
and the voice coil in the speaker unit shown in FIGS. 3A and 3B.
FIG. 6 is a cross-sectional view showing the relative positional relationship between the speaker
unit and the spacer in the speaker system of the first embodiment.
FIG. 7 is an explanatory view showing a cross section of a housing, a speaker unit, and a spacer
in the speaker system according to Embodiment 1, and showing an operation of the speaker
system.
FIG. 8 is a perspective view showing the overall configuration of the speaker system according to
the second embodiment. FIG. 9 is a perspective view of the speaker system according to the
second embodiment with the lid of the housing removed. FIG. 10 is a perspective view of the
speaker system according to the second embodiment with the lid of the housing removed. FIG.
11 is a cross-sectional view showing a cross section of the speaker system according to the
second embodiment cut along a plane C-C in FIG. FIG. 12 is a schematic view showing a use state
of the speaker system according to the second embodiment. FIG. 13 is a perspective view
showing the overall configuration of the speaker system according to the third embodiment. FIG.
14 is a perspective view showing a configuration of a speaker unit and a spacer provided in the
speaker system according to the third embodiment.
[0033]
1. Embodiment 1 Hereinafter, an example of the embodiment of the present invention will be
described in detail with reference to the drawings. 1-1 As shown in FIGS. 1 and 2, the speaker
system 100 according to the configuration embodiment 1 includes a housing 30, a speaker unit
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10 inserted into the housing 30, and vibration described later in the speaker unit 10. A spacer 20
as an example of a sound guiding member inserted between the speaker unit 10 and the bottom
surface of the housing 30 is provided on the back side 10A opposite to the side on which the
plate 1 is provided.
[0034]
The housing 30 is formed in a substantially octagonal prism shape as shown in FIGS. 1, 2 and 7,
and the upper surface is formed with a grill 31 A for emitting a sound from the diaphragm 1 in
the speaker unit 10 A grille surface 31 is formed, and a bass reflex port 32 for radiating back
sound emitted from the back surface 10A of the speaker unit 10 to the outside is opened at one
end face.
[0035]
As shown in FIGS. 1, 2 and 7, the side surfaces of the housing 30 between the grilling surface 31
and the bottom surface 36 are reflecting surfaces 33, 34 and 35.
[0036]
As shown in FIGS. 2, 6 and 7, in the state where the spacer 20 is inserted into the inside of the
housing 30, the top surface 21 is on the back surface 10 A of the speaker unit 10 and the bottom
surface 22 is the bottom surface 35 of the housing 30. It is formed to abut on.
[0037]
A back surface sound reflection surface that reflects the back surface sound emitted from the
back surface 10A of the speaker unit 10 toward the first reflection surface 34 of the housing 30
on the surface of the spacer 20 opposite to the back surface 10A of the speaker unit 10
Reference numeral 24 is formed to face a back surface sound radiation hole 9 in the speaker unit
10 described later.
Although the back sound reflection surface 24 is inclined at an angle of 45 degrees with respect
to the upper surface 21 of the spacer 20, the inclination angle of the back sound reflection
surface 24 with respect to the upper surface 21 is not limited to 45 degrees.
The portion of the spacer 20 on which the back surface sound reflecting surface 24 is formed
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has a chevron shape projecting upward as shown in FIG. 6, in other words, a triangular shape.
In addition, the back sound reflection surface 24 may be a curved surface.
[0038]
On the bottom surface 22 side of the spacer 20, in other words, on the surface opposite to the
side on which the back surface sound reflection surface 24 is formed, a bass load portion 23
which is a tunnel-like cavity is formed. The bass loading portion 23 communicates with the
buffless port 32 in the housing 30 at one end.
[0039]
At the lower edge of each side wall 25 of the spacer 20, a protrusion 26 projecting like a hook is
formed. In a short portion of the side wall 25 opposite to the side adjacent to the bass reflex port
32 of the housing 30, a backside sound introduction port 27 for introducing a backside sound
into the bass loading portion 23 is formed.
[0040]
Next, the speaker unit 10 will be described. As shown in FIGS. 3A, 3B, and 4, the speaker unit 10
includes four magnets 2 arranged in a row at regular intervals, and a diaphragm 1 arranged to
face the magnets 2. A voice coil 3 provided at a position on the side of the diaphragm 1 facing
the magnet 2 at a position facing the magnetic pole 2N of the magnet 2, a yoke 4 abutting on the
magnetic pole 2S of the magnet 2, and a peripheral edge of the diaphragm 1 The diaphragm 1 is
supported at the portion, and the frame 5 to which the magnet 2 and the yoke 4 are attached,
and the edge portion 6 which elastically holds the diaphragm 1 to the frame 5 at the peripheral
portion of the diaphragm 1 are provided.
[0041]
The magnet 2 is formed in a rectangular plate shape, and is magnetized such that one surface is a
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magnetic pole 2N which is an N pole and the other surface is a magnetic pole 2S which is an S
pole. The magnet 2 is attached to the yoke 4 so that the magnetic pole 2N faces the diaphragm 1,
as shown in FIGS. 3A, 3B, and 4, in other words, facing upward in FIGS. 3B and 4. However, the
magnets 2 may be arranged such that the north pole 2N and the south pole 2S are alternately
arranged. Also, for example, the N pole 2N and the S pole 2S may be arranged alternately in two
or three. Furthermore, the N pole 2N and the S pole 2S may be randomly arranged.
[0042]
Voice coils 3 are provided for each of the magnets 2.
[0043]
A pole piece 7 formed of an iron plate and having a planar shape congruent with the magnet 2 is
attached to the magnetic pole 2N of the magnet 2.
At least a portion of the pole piece 7 penetrates into the voice coil 3.
[0044]
The frame 5 as a whole has a longitudinal direction along the arrangement direction of the
magnets 2, and yoke attachment holes 5A are formed at regular intervals, to which the bottom of
the yoke 4 is fitted and fixed. Between the two yoke attachment holes 5A adjacent to each other,
a back surface sound emission hole 9 for radiating a back surface sound generated from the
vibration of the diaphragm 1 from the back surface 10A of the speaker unit 10 is formed.
[0045]
The yoke 4 is formed of a ferromagnetic material, and as shown in FIGS. 4 and 5, a pair of side
edges along the longitudinal direction directs the diaphragm 1 to two parallel faces of the
magnet 2. It is bent upward so as to form a first bent portion 4A. The bottom of the yoke 4 is also
bent upward so as to sandwich the other two surfaces of the magnet 2 to form a second bent
portion 4B. The magnet 2 is surrounded by the first bending portion 4A and the second bending
portion 4B. Each of the first bent portion 4A and the second bent portion 4B has a height such
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that the upper end thereof faces the pole piece 7. As described above, the yoke 4 is fixed to the
yoke mounting hole 5A in the frame 5, and the magnet 2 is mounted on the bottom surface of
the yoke 4.
[0046]
The diaphragm 1 is a sheet-like member having a rectangular planar shape in which the long
side extends along the arrangement direction of the magnets 2, and an opening 1A to which a
bobbin 3A described later of the voice coil 3 is inserted is fixed. Opening at intervals.
[0047]
The diaphragm 1 is formed of a material such as a fiber reinforced phenol resin plate, a
polycarbonate resin plate, a polyimide resin plate, a carbon fiber reinforced resin (CFRP) plate, a
liquid crystal polymer resin plate, and an aluminum alloy plate.
[0048]
As shown in FIGS. 1A and 2, the diaphragm 1 is resiliently supported by the frame 5 at an edge
portion 1B via an edge portion 6 formed of an elastic material.
[0049]
At a portion of the edge portion 6 between the peripheral portion 1B of the diaphragm 1 and the
frame 5, a dome portion 6A having a shape in which the cross section along the width direction
of the diaphragm 1 protrudes upward in a dome shape is formed ing.
The opening of the bobbin 3A protruding from the opening 1A formed in the diaphragm 1 is
covered with a cap 8.
The cap 8 can be formed of the same material as the diaphragm 1.
[0050]
The elastic material used for the edge portion 6 includes a thermoplastic elastomer, a vulcanized
rubber, and a soft resin.
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[0051]
Examples of the thermoplastic elastomer include polyolefin elastomers such as EPDM,
polyurethane elastomers, polyamide elastomers, polyester elastomers, and epoxy resin
elastomers.
Examples of diene rubbers include natural rubber, butadiene rubber, styrene butadiene rubber,
isoprene rubber, chloroprene rubber and nitrile rubber.
In addition, as the soft resin, low density polyethylene resin and soft vinyl chloride resin, vinyl
chloride / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, ethylene / vinyl acetate
copolymer, etc. may be mentioned.
[0052]
As the voice coil 3, as shown in FIG. 3B, FIG. 4 and FIG. 5, one obtained by winding the winding
3B around the bobbin 3A is used, but an air core coil without a bobbin may be used.
[0053]
When using one having the bobbin 3A and the winding 3B as the voice coil 3, the diaphragm 1 is
provided with the opening 1A, and the winding 3B is positioned on the side of the magnet 2 and
the yoke 4 with respect to the diaphragm 1 Also, the bobbin 3A may be inserted into the opening
1A and fixed by adhesion or the like so that the magnet 2 and the pole piece 7 are inserted into
the bobbin 3A.
[0054]
When an air core coil is used as the voice coil 3, the voice coil 3 is fixed to the surface of the
diaphragm 1 facing the magnet 2.
In this case, it is not necessary to form the opening 1A in the diaphragm 1.
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[0055]
1-2 Operation The operation of the speaker system 100 according to the first embodiment will
be described below.
In the speaker unit 10, as described above, the first bending portion 4A and the second bending
portion 4B of the yoke 4 are both bent so that the upper end faces the side surface of the pole
piece 7, and the boil coil 3 is , And between the first bending portion 4A and the second bending
portion 4B and the pole piece 7. Therefore, magnetic lines of force sent from the magnetic pole
2N of the magnet 2 cross the voice coil 3 through the pole piece 7 and reach the magnetic pole
2S of the magnet 2 through the first bending portion 4A and the second bending portion 4B.
Therefore, the winding 3 B of the voice coil 3 intermingles with the magnetic lines of force
formed by the magnet 2.
[0056]
When a voice current is input to the voice coil 3, a force perpendicular to the magnetic flux is
generated according to Fleming's left-hand rule. Here, since the bobbin 3A of the voice coil 3 is
fixed in a state of being inserted into the opening 1A of the diaphragm 1, the movement of the
voice coil 3 is transmitted to the diaphragm 1, and the diaphragm 1 is also It vibrates in the
approaching direction and the away direction.
[0057]
Thus, the sound is emitted to the front side of the diaphragm 1 of the speaker unit 10 (front
sound), and the sound, ie, the back sound is also emitted from the back sound radiation hole 9
also on the back 10A side of the speaker unit 10 . The back sound radiated from the back sound
radiation hole 9 of the speaker unit 10 is reflected obliquely upward toward the reflection
surface 33 of the housing 30 at the back sound reflection surface 24 as shown by the arrow a in
FIG. 7.
[0058]
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The back sound is then reflected by the reflecting surfaces 33, 34, 35 and diffused to the housing
30, as shown by arrows b and c in FIG. Arrows a, b and c in FIG. 7 are an example of a path
through which the back sound radiated from the back sound radiation hole 9 is reflected by the
back sound reflection surface 24 and diffused to the inside of the housing 30, but The paths
through which the sound is diffused are not limited to the paths indicated by arrows a, b and c.
[0059]
The back sound diffused inside the housing 30 is introduced from the back sound introduction
port 27 into the bass loading portion 23.
[0060]
In the bass loading unit 23, bass components of the introduced back sounds resonate.
Thereby, the bass component is expanded. The bass component resonated by the bass loading
unit 23 is radiated from the bass reflex port 32 to the outside.
[0061]
On the other hand, the high sound component of the back sound is attenuated while being
reflected and diffused by the back sound reflection surface 24 and the reflection surfaces 33, 34,
35 of the housing 30.
[0062]
In the speaker system 100 according to the first embodiment, since the housing 30 may have a
size that can accommodate the speaker unit 10 and the spacer 20, it is possible to make the
entire speaker system thinner and smaller.
As described above, the back sound radiated from the back surface 10A of the speaker unit 10 is
reflected and diffused, and the bass component resonates and is amplified by the bass loading
unit 23 and then radiates from the bass reflex port 32 to the outside. Therefore, the bass
component does not beat inside the housing 30. Therefore, not only the high tone area but also
the low tone area can be reproduced well. In addition, since it is not necessary to fill the inside of
11-05-2019
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the casing 30 with the fibrous reflector or the sound absorbing material for preventing curling,
the thickness of the casing 30 can be prevented from increasing by the amount of the fibrous
reflector or the acoustic absorbing material.
[0063]
2. Second Embodiment Another example of the embodiment of the present invention will be
described in detail with reference to the drawings. As shown in FIGS. 8 to 11, the speaker system
200 according to the 2-1 configuration embodiment 2 includes a housing 40 and the speaker
unit 10 inserted into the housing 40.
[0064]
As shown in FIGS. 8 to 11, the housing 40 extends along the width direction of the speaker unit
attachment portion 41 to which the speaker unit 10 is attached and the speaker unit 10 attached
to the speaker unit attachment portion 41. A diffusion portion 42 and a resonance portion 49
integrated with the diffusion portion 42 are provided. Since the speaker unit attachment portion
41 is configured to protrude from the diffusion portion 42, the housing 40 has an L-shaped side
shape as a whole, as shown in FIGS. A bass reflex port 43 is opened at a side wall surface 42 C
parallel to the speaker unit 10 of the diffusion unit 42, in other words, at a central portion of a
wall 49 A of the resonance unit 49. The diffusion portion 42 is partially separated from the
resonance portion 49 by the partition wall 48, but communicates with the resonance portion 49
in the gap between the diffusion portion 42 and the partition wall 42 D in the direction
orthogonal to the speaker unit 10.
[0065]
Between the speaker unit attachment portion 41 and the diffusion portion 42, a back sound
reflection surface 44 for reflecting the back sound radiated from the back surface 10A of the
speaker unit 10 toward the diffusion portion 42 is provided. The back surface sound reflection
surface 44 is formed obliquely to any of the bottom surface 42A of the diffusion portion 42 and
the side wall surface 41A of the speaker unit attachment portion 41. In the second embodiment,
as shown in FIG. 11, the back sound reflection surface 44 is provided at a position facing the
back sound radiation hole 9 in the speaker unit 10, but the entire length of the speaker unit
attachment portion 41 is It may be formed.
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[0066]
The housing 40 is divided into a main body 40A and a lid 40B. A speaker grill 41A is provided at
a portion corresponding to the speaker unit attachment portion 41 in the lid 40B.
[0067]
The back surface sound diffusion members 45, 46, 47 are provided inside the diffusion portion
42. As shown in FIGS. 9 to 11, the back surface sound diffusion member 45 is provided at the
central portion of the diffusion portion 42, and the planar shape is an isosceles triangle whose
bottom side faces the bass reflex port 43. On the other hand, a back sound diffusion member 46
is provided in a pair so as to sandwich the back sound diffusion member 45, and is formed across
the diffusion portion 42 and the speaker unit attachment portion 41. The back surface sound
diffusion member 47 is located between the back surface sound diffusion member 46 and the
side wall 42 D perpendicular to the speaker unit 10 of the diffusion portion 42, and is formed
across the diffusion portion 42 and the speaker unit attachment portion 41. ing. The back
surface sound diffusion members 45, 46, 47 have a height reaching the ceiling surface 42 </ b>
B from the floor surface 42 </ b> A of the diffusion portion 42.
[0068]
The speaker unit 10 has the configuration and form described in the first embodiment. The
speaker unit 10 is mounted on the speaker unit mounting portion 41 so that the side on which
the diaphragm 1 is provided faces the speaker grille 41A and the back surface 10A faces the
back surface sound reflection surface 44.
[0069]
The back sound radiated from the 2-2 action speaker unit 10 is reflected by the back sound
reflection surface 44 as shown by the arrow d in FIG. The back noise introduced to the diffusion
unit 42 passes between the back noise diffusion member 45 and the back noise diffusion
member 46 and between the back noise diffusion member 46 and the back noise diffusion
11-05-2019
19
member 47 as shown in FIG. Thus, the light is diffused to the inside of the diffusion unit 42. The
back noise diffused inside the diffusion part 42 is introduced into the resonance part 49 through
the gap between the partition wall 48 and the side wall 42 D, resonates at the resonance part 49,
and then radiates from the bass reflex port 43 to the outside of the housing 40. Be done.
[0070]
Of the back sound, the high sound component is reflected by the back sound reflection surface
44 and diffused to the diffusion portion 42, and attenuates while passing through the gap
between the partition wall 48 and the side wall 42D, but the bass component is an obstacle.
Because it has the property of diffracting to the opposite side, it resonates at the resonance
portion 49 and is emitted from the bass reflex port 43 to the outside of the housing 40 without
being attenuated even when passing through the path.
[0071]
Therefore, among the sound generated by the vibration of the diaphragm of the speaker unit 10,
the high-tone component is directly radiated through the speaker grill 41A, and the low-tone
component is reflected by the back surface sound reflection surface 44 and diffused into the
diffusion section 42. , Resonates at the resonance portion 49 and is emitted from the bass reflex
port 43.
Therefore, in the speaker system 200 according to the second embodiment, as in the speaker
system 100 according to the first embodiment, no bass is heard inside the housing 40, so that
not only the treble area but also the bass area can be reproduced well. In addition, since it is not
necessary to provide the diffusion portion 42 with a fibrous reflective material or sound
absorbing material for preventing curling, it is possible to make the entire system thinner and
smaller.
[0072]
In addition, as shown in FIG. 12, the speaker system 200 can be used by being hooked on the
upper edge of the display 1001 of the laptop computer 1000 by utilizing the step between the
speaker unit 41 and the diffusion unit 42.
[0073]
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20
3.
Third Embodiment Still another example of the embodiment of the present invention will be
described in detail with reference to the drawings. 3-1 The speaker system 300 according to the
configuration embodiment 3 includes a housing 50 and a speaker unit 60 and a spacer 20
inserted into the housing 50, as shown in FIGS. 13 and 14.
[0074]
The housing 50 has substantially the same configuration as the housing 30 included in the
speaker system 100 according to the first embodiment, but as shown in FIG. 13, the ratio of the
length L to the width W is smaller than the housing 30. small. Further, a bass reflex port 52 is
opened at one end face of the casing 50. The upper surface of the housing 50 is a grill surface 51
on which the speaker grill 51A is formed. Portions of the housing 50 between the grille surface
51 and the bottom surface 56 are reflection surfaces 53, 54, 55.
[0075]
As shown in FIG. 14, the speaker unit 60 includes a yoke 61 formed in a rectangular butt shape,
permanent magnets 62 vertically arranged in five rows inside the yoke 61, and three rows
horizontally, and an upper surface of the yoke 61. And a diaphragm 64 fixed to the surface of the
frame 63 and having a voice coil 65 formed at a position corresponding to the permanent
magnet 62. . A back sound radiation hole 68 is opened in a portion between the permanent
magnets 62 on the bottom surface of the yoke 61.
[0076]
The frame 63 is formed of an elastic body, and an edge 66 continuous in the circumferential
direction is formed at the edge of the opening. The diaphragm 66 is fixed to the edge portion 66.
What was mentioned as a material of diaphragm 1 of speaker unit 10 with which the speaker
system of Embodiment 1 is provided as diaphragm 66 can be used.
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21
[0077]
The permanent magnets 62 correspond to the first magnet and the second magnet of the present
invention, and the adjacent permanent magnets 62 are arranged such that the magnetic poles of
the pole faces 62A are opposite to each other. A nonmagnetic sheet material 67 is attached to the
magnetic pole surface of the permanent magnet 62, whereby direct contact between the
magnetic pole and the diaphragm 64 is prevented.
[0078]
The speaker unit 60 is housed in the housing 50 so that the side of the diaphragm 64 faces the
grill surface 51.
[0079]
The spacer 20 is as described in the first embodiment.
However, the back sound reflection surface 24 is provided at a position facing the back sound
radiation hole 68 in the speaker unit 60.
[0080]
3-2 Action When an audio signal is input to the voice coil 65, a force in a direction perpendicular
to the magnetic flux is generated between the voice coil and the horizontal magnetic flux formed
by the permanent magnet 62, and the diaphragm 64 vibrates.
[0081]
When the diaphragm 64 vibrates, sound is emitted from the speaker grille 51A of the housing
50, and a back sound is emitted from the back sound radiation hole 68 at the bottom of the yoke
61.
[0082]
The back sound radiated from the back sound radiation hole 68 is reflected obliquely upward
toward the reflection surface 53 of the housing 50 at the back sound reflection surface 24 of the
spacer 20 as described in the first embodiment.
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22
[0083]
The back sound is then reflected by the reflection surfaces 53, 54, 55 and diffused into the inside
of the casing 50, and introduced from the back sound introduction port 27 into the bass load
portion 23.
[0084]
In the bass loading unit 23, bass components of the introduced back sounds resonate.
Thereby, the bass component is expanded.
The bass component resonated by the bass loading unit 23 is radiated from the bass reflex port
52 to the outside of the housing 50.
[0085]
On the other hand, the high sound component of the back sound is attenuated while being
reflected and diffused by the back sound reflection surface 24 and the reflection surfaces 53, 54,
55.
[0086]
Also in the speaker system 300 according to the third embodiment, since the housing 50 may
have a size that can accommodate the speaker unit 60 and the spacer 20, it is possible to make
the entire speaker system thinner and smaller.
Then, as described above, the back sound radiated from the speaker unit 60 is reflected and
diffused, and after the bass component is resonated and amplified by the bass loading unit 23
and then emitted from the bass reflex port 52 to the outside, the bass component Indignation is
prevented.
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23
Thus, not only the treble area but also the bass area can be reproduced well.
[0087]
DESCRIPTION OF SYMBOLS 1 diaphragm 2 magnet 3 voice coil 4 yoke 9 back surface sound
radiation hole 10 speaker unit 10A back surface 20 spacer 21 upper surface 23 bass load
portion 24 back surface sound reflection surface 27 back surface sound introduction port 30
housing 32 buffless port 33, 34, 35 reflection surface 40 Housing 41 Speaker unit mounting
portion 42 Diffusion portion 43 Bass reflex port 44 Back surface sound reflection surface 45
Sound conducting member 46 Sound conducting member 47 Sound conducting member 48
Sound conducting member 50 Housing 52 bass reflex port 53, 54, 55 Reflective surface 60
Speaker unit 61 yoke 62 permanent magnet 62A magnetic pole surface 63 frame 64 diaphragm
65 voice coil 66 edge 68 back sound radiation hole 100 speaker system 200 speaker system
300 speaker system
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