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JP2009290565

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JP2009290565
To provide a technology relating to a speaker capable of controlling directivity while having a
configuration simpler than that of the prior art. A speaker according to the present invention is
provided with a magnet unit having a flat plate and a plurality of magnets disposed on one
surface of the flat plate, and spaced apart from the magnet unit by a predetermined distance. A
diaphragm, and a coil provided on the diaphragm and through which a current corresponding to
an audio signal flows. Then, the diaphragm has a first area for generating a predetermined sound
wave, and a second area for generating a sound wave having a higher frequency than the
predetermined sound wave by having different properties from the first area. Have. [Selected
figure] Figure 3
Speaker, diaphragm and speaker system
[0001]
The present invention relates to the technology of a speaker.
[0002]
An array speaker in which a plurality of speakers are arranged is known.
Here, FIG. 1 shows a schematic configuration of a conventional array speaker system. In this
conventional speaker system, an electric signal from a music reproduction apparatus is amplified
by an amplifier (AMP) 202 and output as sound from an array speaker (Lch) 203 and an array
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speaker (Rch) 204. The array speaker 203 (204) is composed of a plurality of speakers 203a,
203b, 203c, 203d and 203e. In such a conventional speaker system, the directivity is controlled
by changing the output sound of each of the speakers 203 a and the like constituting the array
speaker 203.
[0003]
In addition, in order to reduce the thickness of the speaker, there is known a technology using
magnets arranged at equal intervals on a flat plate (see, for example, Patent Document 1). In this
technique, a diaphragm including a coil is disposed above the magnet, and the diaphragm
vibrates to generate sound by supplying a current corresponding to the audio signal to the coil.
JP, 2007-158643, A
[0004]
As a conventional speaker related technology, a technology related to an array speaker in which
a plurality of speakers are arranged is known. In this conventional array speaker, it is possible to
control the directivity by the phase difference of the audio output from the plurality of speakers
constituting the array speaker. However, in the conventional array speaker, the aperture
diameter of each speaker constituting the array speaker is relatively large, and there is a limit to
narrowing the distance between the speakers. As a result, there is a problem that the so-called
flapping of the voice particularly in the high region is large. In addition, the array speaker
requires a plurality of speakers, which may cause the speaker system to be complicated or
enlarged.
[0005]
In the present invention, in view of the above-described background, it is an object of the present
invention to provide a technology relating to a speaker capable of controlling directivity while
having a simpler configuration than the related art.
[0006]
In the present invention, in order to solve the problems described above, a multipoint drive type
speaker is used, and in such a speaker, an area for generating high frequency band sound waves
and an area for generating low frequency band sound waves are used. It is decided to devise the
arrangement of the area, the property of the diaphragm, etc.
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[0007]
More specifically, the speaker according to the present invention is disposed at a predetermined
distance from a magnet unit having a flat plate and a plurality of magnets disposed on one
surface of the flat plate, and the magnet unit. And a coil provided on the diaphragm and through
which a current corresponding to an audio signal flows.
Then, the diaphragm has a first area for generating a predetermined sound wave, and a second
area for generating a sound wave having a higher frequency than the predetermined sound wave
by having different properties from the first area. Have.
[0008]
In the speaker according to the present invention, a plurality of magnets are appropriately
arranged on a flat plate to constitute one magnet unit.
The arrangement mode of the magnets is not particularly limited, but in consideration of the
effective utilization of the magnetic flux from the magnets, the ease of manufacture, etc., it is
preferable that the magnets be regularly arranged at equal intervals. In this one magnet unit, the
magnetic flux is directed from the N pole of the magnet to the S pole, and a magnetic circuit is
formed through the inside of the plane plate and other spaces. And the diaphragm provided with
the coil is arrange | positioned at predetermined intervals with respect to the above magnet
units. As a result, when the current corresponding to the audio signal is supplied to the coil, the
diaphragm vibrates to generate audio. The coil may be provided inside the diaphragm or may be
disposed on the surface of the diaphragm.
[0009]
In the speaker according to the present invention, the vibration plate has a first region for
generating a predetermined sound wave and a property different from the first region to
generate a sound wave in a region higher than the predetermined sound wave. And two regions.
That is, according to the speaker of the present invention, it is possible to generate sound waves
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of different frequencies on one speaker by partially changing the property of the diaphragm. And
directivity can be controlled by changing suitably arrangement | positioning of these 1st area |
regions or 2nd area | regions. Also, by designing the property of the diaphragm according to the
purpose, the frequency at which directivity appears (hereinafter also referred to as directivity
start frequency). ) Can be set arbitrarily.
[0010]
The properties of the diaphragm include, for example, the weight of the diaphragm, the internal
loss of the diaphragm, and the rigidity of the diaphragm. By reducing the weight of the
diaphragm, high frequency band sound waves are easily generated, and the upper limit of the
high frequency band can be increased. By increasing the rigidity, high frequency band sound
waves are easily generated, and vibrations can be efficiently transmitted. Furthermore, by
increasing the internal loss, the vibration is easily absorbed, and as a result, the generation of
high frequency sound waves is suppressed. In addition, by increasing the internal loss, the
vibration is rapidly stopped, so that the disturbance of the frequency characteristic can be
suppressed. On the other hand, when the internal loss is reduced, high frequency band sound
waves are easily generated. Therefore, the material etc. of the diaphragm used in each region
may be designed in consideration of such properties. The first region and the second region may
be formed of different materials, but the properties of the diaphragm may be designed to be
partially different by overlapping and bonding the same material.
[0011]
Here, the directivity control can be performed by specifying the position of the second region
that generates a sound wave having a higher frequency than the predetermined sound wave. The
directivity is particularly affected by the high frequency sound waves, that is, by increasing the
frequency of the sound waves, the directivity is enhanced. Therefore, in the speaker according to
the present invention, directivity control is realized by specifying the position of the second
region having a large influence on directivity. For example, a predetermined frequency in the
central portion of the diaphragm is referred to as a low frequency (hereinafter also referred to as
a low frequency). And a second region for generating high-frequency sound waves outside the
diaphragm, and causing high-frequency sound waves from the second region provided outside to
interfere with each other This makes it possible to provide a narrow directional speaker.
[0012]
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In the speaker according to the present invention, each of the plurality of coils corresponding to
the plurality of magnets functions as one sound source. And directivity arises by the difference of
the distance from a certain coil to the listening point, and the distance from the other coil to the
listening point. Therefore, in the speaker according to the present invention, directivity may be
controlled by adjusting the intervals of the plurality of coils. If the distance between the sound
sources is wide, the difference in the distance from each sound source to the listening point
becomes large. As a result, the amplitude of the wave representing the directivity characteristic is
large, and so-called fluttering may occur in the high region. In the conventional array speaker,
there is a limit in reducing the aperture of each speaker functioning as a sound source, and as a
result, it is difficult to set the interval between the sound sources narrow. On the other hand,
according to the speaker according to the present invention, the distance between the sound
sources can be set narrower than that of the conventional array speaker by using the abovedescribed multi-point drive type speaker. As a result, the amplitude of the wave representing the
directivity characteristic is reduced, and it is possible to suppress so-called flapping in the high
region. In addition, since the distance between sound sources can be narrowed compared to a
conventional array speaker, directivity can be controlled in a wider range.
[0013]
In the above-described speaker according to the present invention, the second region is provided
at the central portion of the diaphragm, and the first region is provided outside the second region
provided at the central portion of the diaphragm. And the speaker may be controlled in a wide
directivity. By providing the first area where directivity is less likely to be generated on the
outside, it is possible to control the speaker in a wide directivity.
[0014]
Further, in the above-described speaker according to the present invention, the second area may
be made of a material whose internal loss is smaller than that of the diaphragm forming the first
area. By making the internal loss of the second region smaller than that of the first region, it is
possible to easily generate high-frequency sound waves.
[0015]
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Here, the coil includes a plurality of coils corresponding to each of the plurality of magnets, and
the plurality of coils provided in the first region are connected in series, and the plurality of coils
provided in the second region May be connected in series. Thereby, the frequency of the current
corresponding to the audio signal sent to the coil in each region can be made the same. Further,
for example, a current corresponding to an audio signal in a higher frequency than the coil
provided in the first region can be input to the coil provided in the second region. That is,
directivity can be controlled by changing the current supplied to the coil. In addition, a coil can
also be comprised so that multiple may be piled up like double and triple.
[0016]
Here, the present invention can also be specified as the diaphragm used for the above-described
speaker. That is, according to the present invention, a coil is disposed at a predetermined
distance from a magnet unit having a flat plate and a plurality of magnets disposed on one
surface of the flat plate, and a current corresponding to an audio signal flows Is a diaphragm
provided with a first region for generating a predetermined sound wave and a second region for
generating a sound wave in a region higher than the predetermined sound wave by having
different properties from the first region. And. Then, by specifying the position of the second
area, it is possible to control the directivity of the speaker in which the diaphragm is used.
[0017]
The present invention can also be specified as a speaker system including the above-described
speaker. That is, according to the present invention, there is provided a magnet unit having a flat
plate and a plurality of magnets disposed on one surface of the flat plate, a diaphragm placed at a
predetermined distance from the magnet unit, and A speaker provided in a diaphragm and
having a coil through which current corresponding to an audio signal flows, and an amplifier for
amplifying an audio signal input to the speaker. Then, the diaphragm has a first area for
generating a predetermined sound wave, and a second area for generating a sound wave having
a higher frequency than the predetermined sound wave by having different properties from the
first area. The directivity of the speaker is controlled by specifying the position of the second
area.
[0018]
According to the present invention, it is possible to provide a technology relating to a speaker
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whose directivity can be controlled while having a simpler configuration than the prior art.
[0019]
Next, an embodiment of a speaker of the present invention will be described based on the
drawings.
[0020]
First Embodiment First, a schematic configuration of a speaker 100 according to an embodiment
will be described.
FIG. 2 shows a schematic configuration of the speaker 100 according to the first embodiment.
The speaker 100 is configured of a magnet unit 2, a diaphragm 3, and a coil 4. The magnet unit
2 is formed by arranging a plurality of magnets 22 regularly and at equal intervals on the frame
21. Here, FIG. 3 shows a top view of the magnet unit 2. As shown in the figure, the magnet 22 is
a rectangular magnet whose end is an N pole or an S pole, and the plurality of magnets 22 have
different magnetic poles in which their tips differ from each other in relation to the adjacent
magnets. It is arranged regularly so that it becomes. The magnet unit 2 of the present
embodiment is configured by five magnets 22 in the horizontal direction and three magnets in
the vertical direction, for a total of 15 magnets 22 on a horizontally long rectangular frame 21.
However, the magnet unit 2 is not limited to such an aspect. The frame 21 may be, for example, a
polygon or a circle, and the arrangement and the total number of the magnets 22 can be
appropriately arranged according to the frame 21.
[0021]
The diaphragm 3 is provided at a predetermined distance from the magnet unit 2. The
diaphragm 3 is elastically fixed to the frame 21 of the magnet unit 2 via the edge 5. The distance
between the diaphragm 3 and the magnet unit 2 can be appropriately designed as a distance
such that the diaphragm 3 and the magnet unit 2 do not contact each other when the diaphragm
3 vibrates.
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[0022]
A coil 4 is provided on the upper surface of the diaphragm 3, and the coil 4 is connected to a
connector 7 provided outside the magnet unit 2 via a tinsel wire 6. A current corresponding to
the audio signal is supplied to the connector 7 from the outside of the speaker 100 through the
cord 8. Further, in the present embodiment, a protective net 9 is provided so as to cover the
diaphragm 3, and adhesion of dust and the like to the diaphragm 3 and the coil 4 is prevented.
The cord 8 can be connected to an amplifier or the like (not shown). In this case, the present
embodiment can also be specified as a speaker system provided with an amplifier or the like.
[0023]
In the present embodiment, the coil 4 is provided on the upper surface of the diaphragm 3.
However, the coil 4 may be provided inside the diaphragm 3 or may be provided on the lower
surface of the diaphragm 3. . Alternatively, the coil 4 may be provided on both the upper and
lower surfaces of the diaphragm 3.
[0024]
When the current corresponding to the audio signal is supplied to the coil 4, the coil 4 through
which the current flows is received by the magnetic flux of the magnetic circuit of the magnet
unit 2, and the diaphragm 3 vibrates. As a result, sound waves are generated from the diaphragm
3.
[0025]
Here, the speaker 100 according to the present embodiment is characterized in that the
diaphragm 3 is configured by two regions, and directivity can be controlled by generating sound
waves having different frequencies in each region. Therefore, this feature point will be mainly
described in more detail. FIG. 4A corresponds to a high band region where a high frequency
sound wave is generated outside the diaphragm 3 (corresponding to a second region of the
present invention). The figure which demonstrates the speaker in which 31 was provided is
shown. In FIG. 4A, the magnet unit 2 is shown by a dotted line in order to help the understanding
of the speaker of the embodiment. FIG. 4B shows a cross-sectional view of the diaphragm of the
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first embodiment. In this aspect, a region corresponding to the three magnets 22 provided in the
central portion of the diaphragm 3 corresponds to a low region (a first region of the present
invention) which generates a low frequency sound wave. 32), and the outside of the low band
region 32 is set as a high band region 31 for generating a high frequency sound wave.
[0026]
Further, in the present embodiment, such two regions are realized by changing the material of
the diaphragm 3. Specifically, in the diaphragm 3, the low range region 32 is formed of a
material having a large internal loss, and the high region 31 is formed of a material having a
small internal loss. As a result, in the low band region 32 made of a material having a large
internal loss, vibration is easily absorbed, and the generation of high frequency sound waves is
suppressed. On the other hand, in the high region 31 composed of a material having a small
internal loss, vibration is less absorbed than in the low region, so even when a signal of the same
frequency is input to the coil 4, the high region Sound waves can be generated.
[0027]
The connection between the material forming the high-pass region 31 and the material forming
the low-pass region 32 may be achieved, for example, by wrapping the end portions with each
other as shown in FIG. 4B and connecting them with an adhesive or the like. Also, for example, as
shown in FIG. 4C, a material having a small internal loss is designed to match the entire size of
the diaphragm 3, and a material having a large internal loss designed to match the low region 32
is bonded You may
[0028]
Here, the material which comprises the diaphragm 3 is demonstrated. FIG. 5 shows an example
of the material constituting the diaphragm 3. Examples of the material having a small internal
loss include metal-based materials such as aluminum, titanium and magnesium. The rigidity of
these metal-based materials is greater than that of resin-based and paper-based materials.
Moreover, a paper type material is illustrated by the material with large internal loss. Further, as
the internal loss is positioned between the metal-based material and the paper-based material,
resin-based materials such as polypropylene (PP), aramid and polyetherimide (PEI) are
exemplified. When the internal loss of the diaphragm 3 is partially changed, these materials may
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be appropriately combined, but the internal loss can also be changed by, for example,
overlapping (pasting) the same material. Further, in the present embodiment, the materials of the
high region 31 and the low region 32 are changed on the basis of the internal loss of the
diaphragm. However, the present invention is not limited to this, and the materials of the high
region 31 and the low region 32 may be changed based on the rigidity and the weight.
[0029]
In the present embodiment, the respective coils 41 a and the like corresponding to the respective
magnets 22 are arranged in series. Here, FIG. 6 shows an outline of wiring of the coil 4. In the
present embodiment, the magnetic poles at the ends of the adjacent magnets 22 are arranged to
be different (see FIG. 3). Therefore, the coils 4 are designed so that the winding directions of the
adjacent coils 4 are reversed, and as shown in FIG. 6, the coils 41a and so on are connected in
series. Therefore, a current of the same frequency corresponding to the audio signal flows in the
coil 4. That is, in the present embodiment, although the configuration is very simple because the
path through which the current flows is one system, it is possible to control directivity by
changing the material of the diaphragm 3. There is.
[0030]
7 shows a cross-sectional view taken along the line AA in FIG. 6, and FIG. 8 shows a crosssectional view taken along the line BB in FIG. In the present embodiment, in consideration of the
leakage of the magnetic flux, the number of turns of the coil located at the end is increased. That
is, at the end or corner where at least a part is open, the possibility of the magnetic flux leaking
to the outside increases, and the magnetic flux density tends to be low. Therefore, by increasing
the number of turns of the coil disposed at the end and the corner and lengthening the length of
the coil (conductor wire), it is devised that the same force acts on the diaphragm 3 . That is, the
coils 41a and 41c corresponding to the magnets disposed at the corners where the two side
surfaces are open have a three-layer structure, and the magnets disposed at the end where one
side surface is open. The coils 41b, 41d, and 41f corresponding to each have a two-layer
structure, and the coil 41e corresponding to a magnet whose all side surfaces are closed is a
single-layer structure. Although the number of turns such as two layers or three layers is used to
facilitate understanding, the number of turns of the coil (the length of the lead) may be
appropriately designed in consideration of the magnetic flux density.
[0031]
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In the speaker 100 according to the present embodiment, the distance between sound sources
can be narrowed compared to a conventional array speaker. As a result, it is possible to suppress
so-called flapping in the high region. Here, FIG. 9 shows a graph of frequency characteristics by a
conventional array speaker. FIG. 10 shows a graph of frequency characteristics by the
loudspeaker according to the present embodiment. In any of the figures, the vertical axis is sound
pressure (dB) and the horizontal axis is frequency (Hz). As shown in FIG. 9, in the conventional
array speaker, the sound waves generated from a plurality of speakers constituting the array
speaker interfere at different frequencies due to the difference in their distances, so the
interfering points (arrows in FIG. 9) Show. ) Occurs. Then, a wave of relatively large amplitude as
shown in FIG. 9 is repeated in the directivity characteristic. On the other hand, in the case of the
speaker 100 according to the present embodiment, although the generation principle of the
directional characteristics is the same, since the distance between the coils (the sound sources) is
narrow, the amplitude becomes small and a gentle curve is obtained. That is, in the speaker 100
of the present embodiment, the surface sound source is approached.
[0032]
According to the speaker 100 of the first embodiment described above, directivity can be
controlled by partially changing the material of the diaphragm 3. That is, in the present
embodiment, by providing the high region 31 outside the diaphragm 3, a narrow directional
speaker is realized. And, in the speaker 100 of this embodiment, the frequency of the current
corresponding to the audio signal is constant, and the narrow directivity speaker 100 is realized
with a very simple configuration. Furthermore, compared with the conventional array speaker,
since the intervals between the sound sources are close, the fluttering of the sound in the high
region is suppressed. Further, the directivity can be freely controlled by the material of the
diaphragm 3, and it becomes possible to set the frequency at which the directivity starts.
[0033]
Second Embodiment Next, a speaker according to a second embodiment will be described based
on the drawings. In addition, about the component same as the speaker which concerns on
embodiment described above, detailed description is abbreviate | omitted by attaching the same
reference number.
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[0034]
FIG. 11 is a view for explaining a loudspeaker according to the second embodiment in which the
high frequency region 31 is provided in the central portion of the diaphragm 3. The basic
configuration of the loudspeaker of the second embodiment is the same as that of the
loudspeaker 100 of the first embodiment. The wiring of the coil 4 is the same as the speaker 100
of the first embodiment, and the illustration is omitted. In the speaker of the second embodiment,
the configuration of the diaphragm 3 is different from that of the diaphragm 3 of the first
embodiment. Specifically, in the diaphragm 3 of the second embodiment, a high region 31 for
generating a high frequency sound wave is provided at the central portion of the diaphragm 3.
And the low band area | region 32 is provided in the outer side of the high band area | region 31
provided in the center part.
[0035]
That is, in the loudspeaker according to the second embodiment, the central portion of the
diaphragm 3 is made of a material having a small internal loss, and the outer side is made of a
material having a large internal loss. As a result, according to the speaker of the second
embodiment, a wide directivity speaker is realized.
[0036]
Third Embodiment Next, a speaker according to a third embodiment will be described based on
the drawings. In addition, about the component same as the speaker which concerns on
embodiment described above, detailed description is abbreviate | omitted by attaching the same
reference number.
[0037]
FIG. 12 shows an exploded perspective view of the diaphragm 3 and the coils 4a and 4b in the
speaker of the third embodiment. FIG. 13 shows a cross-sectional view of the speaker of the third
embodiment. The speaker of the third embodiment is different from the speaker 100 of the first
embodiment in that a coil 4 b is provided on the lower surface of the diaphragm 3. As described
above, at the end or corner of the magnet unit 2, the possibility of the magnetic flux leaking to
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the outside increases, and the magnetic flux density tends to be low. Therefore, in the present
embodiment, the coil 4b is provided on the lower surface at the end and the corner. Thereby, it is
devised that an equal force acts on the diaphragm 3.
[0038]
As for the diaphragm 3, a high frequency region 31 is provided in the central portion as in the
first embodiment. As a result, the speaker 100 of the present embodiment is set to narrow
directivity. However, the present invention is not limited to this. For example, the speaker
according to the embodiment may have a low-pass area in the center portion.
[0039]
Fourth Embodiment Next, a loudspeaker according to a fourth embodiment will be described
based on the drawings. In addition, about the component same as the speaker which concerns on
embodiment described above, detailed description is abbreviate | omitted by attaching the same
reference number.
[0040]
FIG. 14 shows the speaker of the fourth embodiment. The speaker of the fourth embodiment has
a double voice coil structure, and two types of current having different frequencies are input.
Specifically, a current A having a high frequency component is input to the coil A group, and a
current B having a low frequency component is input to the coil B group provided in the central
portion. As a result, according to the speaker of the fourth embodiment, it is possible to provide a
speaker having better narrow directivity.
[0041]
The preferred embodiments of the present invention have been described above, but the speaker
according to the present invention is not limited to these, and can include combinations of these
as much as possible.
[0042]
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BRIEF DESCRIPTION OF THE DRAWINGS The schematic structure of the speaker system of the
conventional array speaker is shown.
The schematic structure of the speaker of 1st embodiment is shown. The top view of the magnet
unit of a first embodiment is shown. The figure which demonstrates the speaker by which the
high region was provided in the outer side of the diaphragm is shown. The sectional view of the
diaphragm of a first embodiment is shown. The sectional view of the diaphragm concerning a
modification is shown. The list of the material which constitutes the diaphragm of a first
embodiment is shown. The outline | summary of wiring of the coil of 1st embodiment is shown.
AA sectional drawing in FIG. 6 is shown. FIG. 7 is a cross-sectional view taken along the line BB in
FIG. 7 shows a graph of frequency characteristics by a conventional array speaker. The graph of
the frequency characteristic by the speaker of 1st embodiment is shown. The figure which
demonstrates the speaker by which the high region was provided in the center part of the
diaphragm based on 2nd embodiment is shown. The disassembled perspective view of the
diaphragm and coil in the speaker of 3rd embodiment is shown. The sectional view of the
speaker of a third embodiment is shown. The schematic structure of the speaker of 4th
embodiment is shown.
Explanation of sign
[0043]
Reference Signs List 2 magnet unit 3 diaphragm 4 coil 5 edge 6 tinsel wire 7 connector 8 code 9
guard net 21 frame 22 ... Magnet 31 ... High range 32 ... Low range
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